scientific research databases free

Explore millions of high-quality primary sources and images from around the world, including artworks, maps, photographs, and more.

Explore migration issues through a variety of media types

• Part of The Streets are Talking: Public Forms of Creative Expression from Around the World
• Part of The Journal of Economic Perspectives, Vol. 34, No. 1 (Winter 2020)
• Part of Cato Institute (Aug. 3, 2021)
• Part of University of California Press
• Part of Open: Smithsonian National Museum of African American History & Culture
• Part of Indiana Journal of Global Legal Studies, Vol. 19, No. 1 (Winter 2012)
• Part of R Street Institute (Nov. 1, 2020)
• Part of Leuven University Press
• Part of UN Secretary-General Papers: Ban Ki-moon (2007-2016)
• Part of Perspectives on Terrorism, Vol. 12, No. 4 (August 2018)
• Part of Leveraging Lives: Serbia and Illegal Tunisian Migration to Europe, Carnegie Endowment for International Peace (Mar. 1, 2023)
• Part of UCL Press

Harness the power of visual materials—explore more than 3 million images now on JSTOR.

Enhance your scholarly research with underground newspapers, magazines, and journals.

Explore collections in the arts, sciences, and literature from the world’s leading museums, archives, and scholars.

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• DynaMed Decisions
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Free Databases

EBSCO provides free research databases covering a variety of subjects for students, researchers and librarians.

Exploring Race in Society

This free research database offers essential content covering important issues related to race in society today. Essays, articles, reports and other reliable sources provide an in-depth look at the history of race and provide critical context for learning more about topics associated with race, ethnicity, diversity and inclusiveness.

EBSCO Open Dissertations

EBSCO Open Dissertations is a collaboration between EBSCO and BiblioLabs to increase traffic and discoverability of ETD research. You can join the movement and add your theses and dissertations to the database, making them freely available to researchers everywhere.

GreenFILE is a free research database covering all aspects of human impact to the environment. Its collection of scholarly, government and general-interest titles includes content on global warming, green building, pollution, sustainable agriculture, renewable energy, recycling, and more. 

Library, Information Science and Technology Abstracts

Library, Information Science & Technology Abstracts (LISTA) is a free research database for library and information science studies. LISTA provides indexing and abstracting for hundreds of key journals, books, research reports. It is EBSCO's intention to provide access to this resource on a continual basis.

Teacher Reference Center

A complimentary research database for teachers,  Teacher Reference Center  (TRC) provides indexing and abstracts for more than 230 peer-reviewed journals.

European Views of the Americas: 1493 to 1750

European Views of the Americas: 1493 to 1750 is a free archive of indexed publications related to the Americas and written in Europe before 1750. It includes thousands of valuable primary source records covering the history of European exploration as well as portrayals of Native American peoples.

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Free Publicly-Accessible Databases

You are here.

The following databases were selected not only for their availablity to the general public but also because of their broad appeal and scope, and access to full-text resources.

• African Journals Online A service to provide access to African published research, and increase worldwide knowledge of indigenous scholarship. It's published in Africa and cover the full range of academic disciplines.  
• AGRICOLA This catalog of the U.S. National Agriculatural Library (NAL) provides citations to agricultural literature. The NAL houses one of the world's largest and most accessible agricultural information collections and advances access to global information for agriculture.  
• AIDSinfo Access to wide-ranging Federal resources on HIV/AIDS clinical research, HIV treatment and prevention, and medical practice guidelines for health care providers and consumers.  
• American Heritage Dictionary of the English Language (4th ed., 2000) [UCSB call #: PE 1628 .A623 2000]
• Anatomy of the Human Body by Henry Gray (20th ed., 1918) [UCSB has later editions at: QM 23.2 .G73]
• The Boston Cooking School Cookbook by Fannie Farmer (1918)
• Cambridge History of English and American Literature (1907-1921) [various call numbers at UCSB]
• The Columbia Encyclopedia (6th ed., 2001) [UCSB call #: Ref AG 5 .C725 2000]
• Columbia Gazetteer of North America (2000) [UCSB call #: Ref E 35 .C65 2000]
• Familiar Quotations by John Bartlett (10th ed., 1919) [UCSB call #: Spec. Coll. PN 6081 .B29 1902; later editions at: PN 6081 .B29 and in Reference at: PN 6081 .B27]
• Robert's Rules of Order Revised (1915) [UCSB call #: Ref JF515 .W42 for latest edition]
• Roget's II: The New Thesaurus (3rd ed., 1995) [UCSB call #: Ref PE1591 .B35]
• Simpson's Contemporary Quotations (1988) "The Most Notable Quotes, 1950-1988" [UCSB call #: Ref PN 6083 .S53 1988]
• The World Factbook (2008)
• BioMed Central Publisher of 187 peer-reviewed open access journals.  
• bizjournals Features local business news from around the nation, top business stories from American City's print editions and industry-specific news from more than 40 industries with access to each of the 42 local business sites; contains 1.25 million business news articles published since 1996.  
• BPubs.com The Business Publications Search Engine Organized by various business categories, this site provides links to full text business articles on the web.  
• Chaucer Bibliography Online The Online Chaucer Bibliography includes materials from the Annotated Chaucer Bibliography published annually in Studies in the Age of Chaucer (call number: PR 1901 .S78) and is sponsored by the NCS and the library of the University of Texas at San Antonio. (Note: "Title" searching is searching for the beginning of the title, not for keywords in the title.  
• Chemistry Central Publishing peer-reviewed open access research in chemistry, from BioMed Central - the leading biomedical open access publisher. This site features chemistry-related articles published in Chemistry Central Journal, BioMed Central journals and independent journals utilizing BioMed Central's open access publishing services. All original research articles published by, or in cooperation with, Chemistry Central are made freely and permanently accessible online immediately upon publication.  
• ClinicalTrials.gov A registry of federally and privately supported clinical trials conducted in the United States and around the world. ClinicalTrials.gov gives you information about a trial's purpose, who may participate, locations, and phone numbers for more details. This information should be used in conjunction with advice from health care professionals.  
• Core Documents of U. S. Democracy To provide American citizens direct online access to the basic Federal Government documents that define our democratic society, a core group of current and historical Government publications is being made available for free, permanent, public access. In addition to full ASCII text, some documents, such as the Constitution and Declaration of Independence, are available as scanned images of the original manuscripts. Document texts range from the Articles of Confederation to the current United States Government Manual, Statistical Abstracts and Code of Federal Regulations.  
• Dictionary.com Dictionary.com provides searchable access to several dictionaries, most notably, the American Heritage Dictionary , 3rd ed. (1996,1992) (in print at PE 1628 .A623 1992), plus Roget's Thesaurus, and links to a number of other dictionary sites on the web.  
• Directory of Open Access Journals This service covers free, full text, quality controlled scientific and scholarly journals. We aim to cover all subjects and languages. Covers nearly 150,000 articles in 834 searchable journals.  
• Energy Citations Database Free access to over 2.3 million science research citations with access to over 179,000 electronic documents, primarily from 1943 forward, made publicly available by the U.S. Department of Energy (DOE). ECD includes scientific and technical research results in disciplines of interest to DOE such as chemistry, physics, materials, environmental science, geology, engineering, mathematics, climatology, oceanography, computer science and related disciplines. It includes bibliographic citations to report literature, conference papers, journal articles, books, dissertations, and patents.  
• English Broadside Ballad Archive Created by the Early Modern Center in the English Department at UCSB, the English Broadside Ballad Archive (formerly, Pepys Ballad Archive) offers a fully-searchable database of over 1,800 broadside ballads, mostly of the seventeenth century and mostly in black-letter print. The ballads were collected by Samuel Pepys into five albums, which are held at Magdalene College, Cambridge. The ballads in the database are accessible as facsimiles, as facsimile transcriptions, and as recorded songs. Also provided are full citations for the ballads as well as background essays about ballad culture of the period and Pepys’s categories for organizing his collection.  
• Espacenet (European Patent Office) The European Patent Office's Esp@acenet provides detailed searching of EPO and PCT patent applications for the last 24 months, and worldwide patent documents searchable by patent number as early as 1920 for some issuing nations.  
• FWS National Image Library U.S. Fish & Wildlife Service's online collection of public domain still photographs, containing still photo images of wildlife, plants, National Wildlife Refuges and other scenics, as well as wildlife management work.  
• Google Scholar Google Scholar enables you to search specifically for scholarly literature, including peer-reviewed papers, theses, books, preprints, abstracts and technical reports from all broad areas of research. Use Google Scholar to find articles from a wide variety of academic publishers, professional societies, preprint repositories and universities, as well as scholarly articles available across the web.  
• Govinfo From the U.S. Government Printing Office: provides free electronic access to a wealth of important information products produced by the Federal Government. The information provided on this site is the official, published version.  
• Hearth Hearth is a core electronic collection of books and journals in Home Economics and related disciplines. Titles published between 1850 and 1950 were selected and ranked by teams of scholars for their great historical importance. The first phase of this project focused on books published between 1850 and 1925 and a small number of journals. Future phases of the project will include books published between 1926 and 1950, as well as additional journals. The full text of these materials, as well as bibliographies and essays on the wide array of subjects relating to Home Economics, are all freely accessible on this site.  
• Encyclopedia.com Contains nearly 200,000 brief entries from the Britannica , Oxford University Press , and Columbia Encyclopedia .  
• HighWire Press Free full-text articles in science disciplines, from HighWire Press at Stanford University.  
• ibiblio One of the largest "collections of collections" on the Internet, ibiblio.org is a conservancy of freely available information, including software, music, literature, art, history, science, politics, and cultural studies. ibiblio.org is a collaboration of the School of Information and Library Science and the School of Journalism and Mass Communication at The University of North Carolina - Chapel Hill.  
• InfoPlease Search the Information Please almanac and timeline, their atlas, the Columbia Encyclopedia, a dictionary, and a thesaurus. Information Please has been providing authoritative answers to all kinds of factual questions since 1938.  
• Audio Archive The Archive contains over a hundred thousand free digital recordings ranging from alternative news programming, to Grateful Dead concerts, to Old Time Radio shows, to book and poetry readings, to original music uploaded by our users. Many of these audios and MP3s are available for free download.
• Live Music Archive The Internet Archive has teamed up with etree wiki to preserve and archive as many live concerts as possible for current and future generations to enjoy. All music in this Collection is from trade-friendly artists and is strictly noncommercial, both for access here and for any further distribution. Artists' commercial releases are off-limits. This collection is maintained by the etree.org community.
• Moving Images Collections This collection of thousands of digital movies is free and open for everyone to use. It includes the Prelinger Archive, a collection of nearly 2,000 advertising and educational films from 1927 to the present.
• Text Archive This collection is open to the community for the contribution of any type of text.  
• Library of Congress Digital Collections This Library of Congress project provides access to a large number of LoC collections, searchable and browsable by subject and title, including a large quantity of digitized primary source material.
• MagPortal "Find individual articles from many free magazines by browsing the categories or using the search engine."  
• Making of America: at Cornell University and University of Michigan Hosted at Cornell University and the University of Michigan, Making of America (MOA) is a digital library of primary sources in American social history from the antebellum period through reconstruction. The collection is particularly strong in the subject areas of education, psychology, American history, sociology, religion, and science and technology. The Cornell collection currently contains 267 monograph volumes and over 100,000 journal articles with 19th century imprints while the Michigan collection contains approximately 10,000 books and 50,000 journal articles with 19th century imprints, estimated at over 3% of all American monographs published in the 19th century. All are in the form of searchable scanned images.  
• MedKnow Publications The largest publisher in India for academic and scientific biomedical journals, publishing high quality peer-reviewed scholarly journals. Medknow, with over 40 print + online journals, is probably the largest open access publisher of print journals in the world and provides immediate free access to the electronic editions of the journals.  
• MedlinePlus "Extensive information from the National Institutes of Health and other trusted sources on over 740 topics on conditions, diseases and wellness. There are also lists of hospitals and physicians, a medical encyclopedia and a medical dictionary, health information in Spanish, extensive information on prescription and nonprescription drugs, health information from the media, and links to thousands of clinical trials."  
• Online Exhibits Features high resolution images of a variety of manuscripts, artworks and photographs from the U.S. National Archives.
• Featured Documents
• America's Historical Documents The National Archives preserves and provides access to the records of the Federal Government. Here is a sample of these records, from our most celebrated milestones to little-known surprises.
• Educators & Students: Primary Sources and Activities A large number of collections of primary documents and images arranged for use by teachers of history, civics or use of government documents.  
• National Forest Service Library Catalog of records to Forest Service Research publications dating back to 1904. Includes almost 6,000 full-text publications.  
• National Service Center for Environmental Publications A database of over 24,000 full-text U.S. EPA documents  
• NCJRS Virtual Library (National Criminal Justice Reference Service) Access to more than 3,500 full text publications and more than 190,000 abstracts, or summaries, of publications on this site and from NCJRS partner agency websites.  
• O*NET OnLine From the U.S. Department of Labor, the Occupational Information Network is a comprehensive database of worker attributes and job characteristics. The O*NET database includes information on skills, abilities, knowledges, work activities, and interests associated with occupations. Information in O*NET is available for over 800 occupations. Each occupational title and code is based on the most current version of the Standard Occupational Classification system.O*NET replaces the Dictionary of Occupational Titles (DOT).  
• Online Archive of California The Online Archive of California is a collaborative project to create a searchable online union database of finding aids to archival collections. This database includes the finding aids to repositories from more than 90 institutions statewide including all nine UC campuses, and is continuing to expand. Finding aids provide detailed descriptions of collections, their intellectual organization and, at varying levels of analysis, of individual items in the collections. A small but increasing number of the finding aids contain links to online digital versions of the source material.  
• The Online Books Page "Listing over 25,000 free books on the Web," by author, title, subject, and other features, such as: "A Celebration of Women Writers," "Banned Books Online," "Prize Winners Online," "Foreign Language," and "Specialty" by subject. This site also links to extensive directories which list thousands more online books.
• OSTI.gov Search the U.S. Dept. of Energy's scientific and technical research reports in the sciences including biology, environmental sciences, physics, energy, and other topics.
• Paper of Record Building the world's largest searchable archive of historical newspapers. Over 21 million images in the collection so far. Searchable newspaper image documents presented in their original published form.  
• Project Gutenberg Project Gutenberg is one of the earliest attempts to provide widespread access to public domain books via the Internet. As of 2002, it offers about 6,200 works, adding about 150 per month. Files are in plain ASCII text or in zipped ASCII text, available from a number of mirror sites around the world. The Project Gutenberg catalog is searchable by author and title. Author and title lists may be downloaded by FTP.  
• PLoS: Public Library of Science A nonprofit organization of scientists and physicians committed to making the world's scientific and medical literature a freely available public resource.  
• PubMed Central (PMC) The U.S. National Institutes of Health (NIH) free digital archive of biomedical and life sciences journal literature.  
• Science.gov Science.gov is a gateway to over 50 million pages of authoritative selected science information provided by U.S. government agencies, including research and development results.  
• USPTO Patent Database The U.S. Patent and Trademark Office (USPTO)'s Patent Databases allows searching of the bibliographic data (titles, inventors, assignees, class codes, references, etc.) or full text in US patents issued since 1976.  
• USPTO Trademark Database The U.S. Patent and Trademark Office (USPTO)'s Trademark Electronic Search System (TESS) allows searching of the key data (titles, owners, relevant dates) in current Federal trademarks and inactive ones back to 1984. Results display the trademark text data and, in many cases, the images for graphic trademarks. It does not include state or foreign trademarks.

Updated: 10/12/20

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When you choose to publish with PLOS, your research makes an impact. Make your work accessible to all, without restrictions, and accelerate scientific discovery with options like preprints and published peer review that make your work more Open.

• PLOS Biology
• PLOS Climate
• PLOS Complex Systems
• PLOS Computational Biology
• PLOS Digital Health
• PLOS Genetics
• PLOS Global Public Health
• PLOS Medicine
• PLOS Mental Health
• PLOS Neglected Tropical Diseases
• PLOS Pathogens
• PLOS Sustainability and Transformation
• PLOS Collections

Breaking boundaries. Empowering researchers. Opening Science.

PLOS is a nonprofit, Open Access publisher empowering researchers to accelerate progress in science and medicine by leading a transformation in research communication.

Every country. Every career stage. Every area of science. Hundreds of thousands of researchers choose PLOS to share and discuss their work. Together, we collaborate to make science, and the process of publishing science, fair, equitable, and accessible for the whole community.

FEATURED COMMUNITIES

• Molecular Biology
• Microbiology
• Neuroscience
• Cancer Treatment and Research

RECENT ANNOUNCEMENTS

Written by Lindsay Morton Over 4 years: 74k+ eligible articles. Nearly 85k signed reviews. More than 30k published peer review history…

The latest quarterly update to the Open Science Indicators (OSIs) dataset was released in December, marking the one year anniversary of OSIs…

PLOS JOURNALS

PLOS publishes a suite of influential Open Access journals across all areas of science and medicine. Rigorously reported, peer reviewed and immediately available without restrictions, promoting the widest readership and impact possible. We encourage you to consider the scope of each journal before submission, as journals are editorially independent and specialized in their publication criteria and breadth of content. 

PLOS Biology PLOS Climate PLOS Computational Biology PLOS Digital Health PLOS Genetics PLOS Global Public Health PLOS Medicine PLOS Neglected Tropical Diseases PLOS ONE PLOS Pathogens PLOS Sustainability and Transformation PLOS Water

Now open for submissions:

PLOS Complex Systems PLOS Mental Health

ADVANCING OPEN SCIENCE

Open opportunities for your community to see, cite, share, and build on your research. PLOS gives you more control over how and when your work becomes available.

Ready, set, share your preprint. Authors of most PLOS journals can now opt-in at submission to have PLOS post their manuscript as a preprint to bioRxiv or medRxiv.

All PLOS journals offer authors the opportunity to increase the transparency of the evaluation process by publishing their peer review history.

We have everything you need to amplify your reviews, increase the visibility of your work through PLOS, and join the movement to advance Open Science.

FEATURED RESOURCES

Ready to submit your manuscript to PLOS? Find everything you need to choose the journal that’s right for you as well as information about publication fees, metrics, and other FAQs here.

We have everything you need to write your first review, increase the visibility of your work through PLOS, and join the movement to advance Open Science.

Transform your research with PLOS.   Submit your manuscript

🇺🇦    make metadata, not war

A comprehensive bibliographic database of the world’s scholarly literature

The world’s largest collection of open access research papers, machine access to our vast unique full text corpus, core features, indexing the world’s repositories.

We serve the global network of repositories and journals

Comprehensive data coverage

We provide both metadata and full text access to our comprehensive collection through our APIs and Datasets

Powerful services

We create powerful services for researchers, universities, and industry

Cutting-edge solutions

We research and develop innovative data-driven and AI solutions

Committed to the POSI

Cost-free PIDs for your repository

OAI identifiers are unique identifiers minted cost-free by repositories. Ensure that your repository is correctly configured, enabling the CORE OAI Resolver to redirect your identifiers to your repository landing pages.

OAI IDs provide a cost-free option for assigning Persistent Identifiers (PIDs) to your repository records. Learn more.

Who we serve?

Enabling others to create new tools and innovate using a global comprehensive collection of research papers.

“ Our partnership with CORE will provide Turnitin with vast amounts of metadata and full texts that we can ... ” Show more

Gareth Malcolm, Content Partner Manager at Turnitin

Academic institutions.

Making research more discoverable, improving metadata quality, helping to meet and monitor open access compliance.

“ CORE’s role in providing a unified search of repository content is a great tool for the researcher and ex... ” Show more

Nicola Dowson, Library Services Manager at Open University

Researchers & general public.

Tools to find, discover and explore the wealth of open access research. Free for everyone, forever.

“ With millions of research papers available across thousands of different systems, CORE provides an invalu... ” Show more

Jon Tennant, Rogue Paleontologist and Founder of the Open Science MOOC

Helping funders to analyse, audit and monitor open research and accelerate towards open science.

“ Aggregation plays an increasingly essential role in maximising the long-term benefits of open access, hel... ” Show more

Ben Johnson, Research Policy Adviser at Research England

Our services, access to raw data.

Create new and innovative solutions.

Content discovery

Find relevant research and make your research more visible.

Managing content

Manage how your research content is exposed to the world.

Companies using CORE

Gareth Malcolm

Content Partner Manager at Turnitin

Our partnership with CORE will provide Turnitin with vast amounts of metadata and full texts that we can utilise in our plagiarism detection software.

Academic institution using CORE

Kathleen Shearer

Executive Director of the Confederation of Open Access Repositories (COAR)

CORE has significantly assisted the academic institutions participating in our global network with their key mission, which is their scientific content exposure. In addition, CORE has helped our content administrators to showcase the real benefits of repositories via its added value services.

Partner projects

Ben Johnson

Research Policy Adviser

Aggregation plays an increasingly essential role in maximising the long-term benefits of open access, helping to turn the promise of a 'research commons' into a reality. The aggregation services that CORE provides therefore make a very valuable contribution to the evolving open access environment in the UK.

Reference management. Clean and simple.

The top list of academic research databases

2. Web of Science

5. ieee xplore, 6. sciencedirect, 7. directory of open access journals (doaj), get the most out of your academic research database, frequently asked questions about academic research databases, related articles.

Whether you are writing a thesis , dissertation, or research paper it is a key task to survey prior literature and research findings. More likely than not, you will be looking for trusted resources, most likely peer-reviewed research articles.

Academic research databases make it easy to locate the literature you are looking for. We have compiled the top list of trusted academic resources to help you get started with your research:

Scopus is one of the two big commercial, bibliographic databases that cover scholarly literature from almost any discipline. Besides searching for research articles, Scopus also provides academic journal rankings, author profiles, and an h-index calculator .

• Coverage: 90.6 million core records
• References: N/A
• Discipline: Multidisciplinary
• Access options: Limited free preview, full access by institutional subscription only
• Provider: Elsevier

Web of Science also known as Web of Knowledge is the second big bibliographic database. Usually, academic institutions provide either access to Web of Science or Scopus on their campus network for free.

• Coverage: approx. 100 million items
• References: 1.4 billion
• Access options: institutional subscription only
• Provider: Clarivate (formerly Thomson Reuters)

PubMed is the number one resource for anyone looking for literature in medicine or biological sciences. PubMed stores abstracts and bibliographic details of more than 30 million papers and provides full text links to the publisher sites or links to the free PDF on PubMed Central (PMC) .

• Coverage: approx. 35 million items
• Discipline: Medicine and Biological Sciences
• Access options: free
• Provider: NIH

For education sciences, ERIC is the number one destination. ERIC stands for Education Resources Information Center, and is a database that specifically hosts education-related literature.

• Coverage: approx. 1.6 million items
• Discipline: Education
• Provider: U.S. Department of Education

IEEE Xplore is the leading academic database in the field of engineering and computer science. It's not only journal articles, but also conference papers, standards and books that can be search for.

• Coverage: approx. 6 million items
• Discipline: Engineering
• Provider: IEEE (Institute of Electrical and Electronics Engineers)

ScienceDirect is the gateway to the millions of academic articles published by Elsevier, 1.4 million of which are open access. Journals and books can be searched via a single interface.

• Coverage: approx. 19.5 million items

The DOAJ is an open-access academic database that can be accessed and searched for free.

• Coverage: over 8 million records
• Provider: DOAJ

JSTOR is another great resource to find research papers. Any article published before 1924 in the United States is available for free and JSTOR also offers scholarships for independent researchers.

• Coverage: more than 12 million items
• Provider: ITHAKA

Start using a reference manager like Paperpile to save, organize, and cite your references. Paperpile integrates with PubMed and many popular databases, so you can save references and PDFs directly to your library using the Paperpile buttons:

Scopus is one of the two big commercial, bibliographic databases that cover scholarly literature from almost any discipline. Beside searching for research articles, Scopus also provides academic journal rankings, author profiles, and an h-index calculator .

PubMed is the number one resource for anyone looking for literature in medicine or biological sciences. PubMed stores abstracts and bibliographic details of more than 30 million papers and provides full text links to the publisher sites or links to the free PDF on PubMed Central (PMC)

An official website of the United States government

The .gov means it’s official. Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

The site is secure. The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

• Publications
• Account settings

PubMed® comprises more than 37 million citations for biomedical literature from MEDLINE, life science journals, and online books. Citations may include links to full text content from PubMed Central and publisher web sites.

Featured Bookshelf titles

Characteristics of Existing Asthma Self-Management Education Packages

Leas BF, Tipton K, Bryant-Stephens T, et al.

Drug Therapy for Early Rheumatoid Arthritis

A Systematic Review Update

Donahue KE, Gartlehner G, Schulman ER, et al.

Literature databases

Books and reports

Ontology used for PubMed indexing

Books, journals and more in the NLM Collections

Scientific and medical abstracts/citations

Full-text journal articles

Gene sequences and annotations used as references for the study of orthologs structure, expression, and evolution

Collected information about gene loci

Functional genomics studies

Gene expression and molecular abundance profiles

Homologous genes sets for selected organisms

Sequence sets from phylogenetic and population studies

Protein sequences, 3-D structures, and tools for the study of functional protein domains and active sites

Conserved protein domains

Protein sequences grouped by identity

Protein sequences

Models representing homologous proteins with a common function

Experimentally-determined biomolecular structures

A tool to find regions of similarity between biological sequences

Search nucleotide sequence databases

Search protein sequence databases

Search protein databases using a translated nucleotide query

Search translated nucleotide databases using a protein query

Find primers specific to your PCR template

Genome sequence assemblies, large-scale functional genomics data, and source biological samples

Genome assembly information

Museum, herbaria, and other biorepository collections

Biological projects providing data to NCBI

Descriptions of biological source materials

Genome sequencing projects by organism

DNA and RNA sequences

High-throughput sequence reads

Taxonomic classification and nomenclature

Heritable DNA variations, associations with human pathologies, and clinical diagnostics and treatments

Privately and publicly funded clinical studies conducted around the world

Human variations of clinical significance

Genotype/phenotype interaction studies

Short genetic variations

Genome structural variation studies

Genetic testing registry

Medical genetics literature and links

Online mendelian inheritance in man

Repository of chemical information, molecular pathways, and tools for bioactivity screening

Bioactivity screening studies

Chemical information with structures, information and links

Molecular pathways with links to genes, proteins and chemicals

Deposited substance and chemical information

Research news

Talk therapy cuts risk of postpartum depression.

An intervention given to pregnant women by non-specialist providers greatly reduced the chances of developing postpartum depression or anxiety.

How excess niacin may promote cardiovascular disease

Findings about a metabolite of niacin, or vitamin B3, raise concerns about the health effects of too much niacin and suggest new measures to help prevent or treat cardiovascular disease

Birds, bees and even plants might act weird during the solar eclipse

A total eclipse isn’t just a spectacle in the sky. Birds, insects and even plants will take notice, and might start acting strange.

Recent blog posts

Medgen users, we want your feedback.

Do you use NCBI’s MedGen? If so, then you probably know it’s NCBI’s one-stop-shop for genetic phenotype information. If you are a healthcare provider, genetic professional, researcher, or anyone who uses MedGen, we want to hear from you to help us make this resource better meet your needs!   We want to know:  How you currently … Continue reading MedGen Users, We Want Your Feedback! →

Immune Checkpoint Discovery Has Implications for Treating Cancer and Autoimmune Diseases

Your immune system should ideally recognize and attack infectious invaders and cancerous cells. But the system requires safety mechanisms, or brakes, to keep it from damaging healthy cells. To do this, T cells—the immune system’s most powerful attackers—rely on immune “checkpoints” to turn immune activation down when they receive the right signal. While these interactions have been well studied, a research team supported in part by NIH has made an unexpected discovery into how a key immune checkpoint works, with potentially important implications for therapies designed to boost or dampen immune activity to treat cancer and autoimmune diseases.

“Computers don’t diagnose the same way that doctors do” - NLM Lecture Explored How a Cancer Diagnosis Can Help Illustra…

How can cancer help us understand algorithmic bias? At this year’s NLM Science, Technology, and Society Lecture, journalist and AI ethics expert Meredith Broussard shared how her personal experience with breast cancer can help illuminate the potential impact that racial and gender bias can have on the use of AI in medical contexts.

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10 Free Research and Journal Databases

3-minute read

• 6th April 2019

Finding good research can be tough, especially when so much of it is locked behind paywalls . But there are free resources out there if you know where to look. So to help out, we’ve compiled a list of ten free academic search engines and databases that you should check out.

1. Google Scholar

Even if you’ve not used Google Scholar before, you’ll know Google. And, thus, you can probably guess that Google Scholar is a search engine dedicated to academic work. Not everything listed on Google Scholar will be freely available in full. But it is a good place to start if you’re looking for a specific paper, and many papers can be downloaded for free.

CORE is an open research aggregator. This means it works as a search engine for open access research published by organizations from around the world, all of which is available for free. It is also the world’s largest open access aggregator , so it is a very useful resource for researchers!

3. Bielefeld Academic Search Engine (BASE)

Another dedicated academic search engine, BASE offers access to more than 140 million documents from more than 6,000 sources. Around 60% of these documents are open access, and you can filter results to see only research that is available for free online.

4. Directory of Open Access Journals (DOAJ)

The Directory of Open Access Journals (DOAJ) is a database that lists around 12,000 open access journals covering all areas of science, technology, medicine, social science, and the humanities.

PubMed is a search engine maintained by the NCBI, part of the United States National Library of Medicine. It provides access to more than 29 million citations of biomedical research from MEDLINE, life science journals, and online books. The NCBI runs a similar search engine for research in the chemical sciences called PubChem , too, which is also free to use.

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6. E-Theses Online Service (EThOS)

Run by the British Library, EThOS is a database of over 500,000 doctoral theses. More than half of these are available for free, either directly via EThOS or via a link to a university website.

7. Social Science Research Network (SSRN)

SSRN is a database for research from the social sciences and humanities, including 846,589 research papers from 426,107 researchers across 30 disciplines. Most of these are available for free, although you may need to sign up as a member (also free) to access some services.

8. WorldWideScience

WorldWideScience is a global academic search engine, providing access to national and international scientific databases from across the globe. One interesting feature is that it offers automatic translation, so users can have search results translated into their preferred language.

9. Semantic Scholar

Semantic Scholar is an “intelligent” academic search engine. It uses machine learning to prioritize the most important research, which can make it easier to find relevant literature. Or, in Semantic Scholar’s own words, it uses influential citations, images, and key phrases to “cut through the clutter.”

10. Public Library of Science (PLOS)

PLOS is an open-access research organization that publishes several journals. But as well as publishing its own research, PLOS is a dedicated advocate for open-access learning. So if you appreciate the search engines and databases we’ve listed here, check out the rest of the PLOS site to find out more about their campaign to enable access to knowledge.

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Free Databases (all subjects): Science and Technology

• Anthropology
• Theater Arts
• Criminal Justice
• Dissertations
• Ethnic Studies
• Free Online Journals
• Gerontology
• Kinesiology
• Library Science
• Political Science
• Encyclopedias
• Dictionaries
• Style and Citation Guides
• Engineering
• Environment
• Physics/Astronomy
• Science Education
• Statistical Sources
• Women's Studies

General Science

For databases related to a specific science, use the pull down list under the "Science" tab.

• Albert Einstein's Complete Papers "The Einstein Archives Online Website provides the first online access to Albert Einstein’s scientific and non-scientific manuscripts held by the Albert Einstein Archives at the Hebrew University of Jerusalem"
• Ciencia.gov All of Science.gov in Spanish
• National Academies Press Free download of all PDFs in education, science, medicine, engineering and more. more... less... The National Academies Press (NAP) was created by the National Academies to publish the reports issued by the National Academy of Sciences, the National Academy of Engineering, the Institute of Medicine, and the National Research Council, all operating under a charter granted by the Congress of the United States. The NAP publishes more than 200 books a year on a wide range of topics in science, engineering, and health, capturing the most authoritative views on important issues in science and health policy. The institutions represented by the NAP are unique in that they attract the nation’s leading experts in every field to serve on their award-wining panels and committees. The nation turns to the work of NAP for definitive information on everything from space science to animal nutrition.
• Science Daily Features major headlines and news stories for all scientific disciplines, including laboratory science, environmental science, health science, and computer science. The site features easy sorting options, is updated continuously, and provides thorough source information for all stories.
• Science Watch ScienceWatch.com (updated weekly) provides a behind-the-scenes look at the scientists, journals, institutions, nations, and papers selected by Essential Science IndicatorsSM from Thomson Reuters and other products of the Research Services Group.
• Science.gov "Science.gov searches over 55 databases and over 2100 selected websites from 13 federal agencies, offering 200 million pages of authoritative U.S. government science information including research and development results."
• << Previous: Style and Citation Guides
• Next: Biology >>
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Stay Connected With Semantic Scholar Sign Up What Is Semantic Scholar? Semantic Scholar is a free, AI-powered research tool for scientific literature, based at the Allen Institute for AI.

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Databases for science research.

This list reflects just some of the science databases available to researchers from the Smithsonian Libraries and Archives. For a complete list of subscription and vetted databases go to E-journals, E-books, and Databases . For more subject-specific resources see our Science Research Guides .

Databases that require SI network for access are indicated by "SI staff." For information about remote access see Off-Site Access to Electronic Resources .

Broad Science Research Databases

• AGRICOLA : The National Agricultural Library's  comprehensive database covering agriculture and allied disciplines, including: chemistry, engineering, entomology, forestry, social science (general), and water resources.
• Anthropology Plus  (SI staff): Index of journal articles, and additional resources from core and lesser-known journals from the early 19th century to today. 
• Encyclopedia of Life (EOL) : Online encyclopedia of all living species, currently number over 1.9 million. 
• GeoRef  (SI staff): Over 3.4 million references in the geosciences, including journal articles, books, maps, conference papers, reports and theses.
• Google Scholar : Accessing Google Scholar from the Smithsonian computer network provides access to library-subscribed full text. For more information, see Off-Site Access to Electronic Resources .
• Journal Citation Reports  (SI staff): Provides impact factors and rankings of many journals in the social and life sciences based on citation analysis.
• PubMed : Includes more than 22 million citations for biomedical literature from MEDLINE, life science journals, and online books.
• U.S. Geological Survey Library : Among the largest geoscience library collections in the world.
• Web of Science: Core Collection  (SI staff): Covers over 12,000 of the highest impact journals worldwide with coverage from 1900 to present. See the Web of Science training portal  for additional help resources. 
• Worldcat (web)  or WorldCat (OCLC FirstSearch)  (SI staff): Combined search of thousands of library catalogs from around the world, including books, music, videos, and digital content records.
• Zoological Record  (SI staff): Considered the world's leading taxonomic reference for zoological names, indexing 90% of the world literature in zoology.

Focused Science Databases

For research guides on a variety of natural history topics, including additional databases and resources, see our Science Research Guides .

• Algaebase : Database of taxonomic, nomenclatural, and distributional information on terrestrial, marine, and freshwater algae organisms.
• AnimalBase: Early Zoological Literature Online : Hosted by the Zoological Institute of the University of Gottingen, this database provides open access to zoological works from 1550-1770.
• AnthroSource  (SI staff): Full-text anthropological resources from the breadth and depth of the discipline.
• AquaDocs : A thematic repository covering the natural marine, coastal, estuarine /brackish and fresh water environments.
• Birds of North America Online : Comprehensive resource from the Cornell Lab of Ornithology and the American Ornithologists' Union.
• Catalogue of Life (Species 2000 - ITIS) : Project that catalogued over one million species as of 2001.
• FishBase : Database covering the breadth of all known species, considered a powerful tool for ecology.
• GreenFILE  (SI staff): Covers connections between the environment and a variety of disciplines and includes topics such as global climate change, green building, and more.
• Index of Botanical Publications  (Harvard University Herbaria): Created to assist in the verification of publication names in the Specimen Database and the Gray Index.
• Index of Botanists  (Harvard University Herbaria): Comprehensive database of authors and collectors in botany, mycology, including systematic publications.
• IOPI Database of Plant Databases : Hosted by Charles Sturt University, this meta-database allows the user search granularity across 100 metadata fields.
• International Plant Names Index : Nomenclatural database for the scientific names of vascular plants, linking directly to the Biodiversity Heritage Library .
• ITIS: Integrated Taxonomic Information System : Created through international partnerships (including the Smithsonian), this database hosts authoritative taxonomic information on plants, animals, fungi, and microbes.
• JSTOR Global Plants  (SI staff): Includes plant type specimens, taxonomic structures, scientific literature, and related materials.
• KBD: Kew Bibliographic Databases : Selection of 24 botanical databases containing information on correspondence, herbaria, seed lists, etc.
• Latindex : Regional Cooperative Online Information System for Scholarly Journals from Latin America, the Caribbean, Spain and Portugal. For more details, visit http://en.wikipedia.org/wiki/Latindex .
• National Museum of Natural History Research and Collections Information System (EMu) : Over ten million specimen records covering six departments and four divisions of the National Museum of Natural History. 
• SORA: Searchable Ornithological Research Archive : Developed by the University Libraries at the University of New Mexico, SORA is the world’s largest open access ornithological publications database.

Digitized Science Collections

• AnimalBase: Early Zoological Literature Online :  Hosted by the Zoological Institute of the University of Gottingen, this database provides open access to zoological works from 1550-1770.
• Biodiversity Heritage Library : A digital library containing primarily historical texts in the natural sciences.
• Field Book Project (Smithsonian Archives) : With the purpose of illuminating unpublished works integral to scientific research, the FBP database contains 4,000 digitized field books and 9,500 catalogued field books, in total.
• Joseph Henry Papers Project (Smithsonian Archives) : The scientific output of the first Secretary of the Smithsonian.  Contains over 170,000 documents in fifteen scientific disciplines.

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Databases articles within Nature

Nature Index | 13 March 2024

A guide to the Nature Index

A description of the terminology and methodology used in this supplement, and a guide to the functionality that is available free online at natureindex.com.

Article 06 March 2024 | Open Access

Decoding chromatin states by proteomic profiling of nucleosome readers

A multidimensional proteomics analysis of the interactions between around 2,000 nuclear proteins and over 80 modified dinucleosomes representing promoter, enhancer and heterochromatin states provides insights into how chromatin states are decoded by chromatin readers.

• Saulius Lukauskas
• , Andrey Tvardovskiy
•  &  Till Bartke

News | 23 February 2024

‘All of Us’ genetics chart stirs unease over controversial depiction of race

Debate over figure connecting genes, race and ethnicity reignites concerns among geneticists about how to represent human diversity.

Article 19 February 2024 | Open Access

Genomic data in the All of Us Research Program

A study describes the release of clinical-grade whole-genome sequence data for 245,388 diverse participants by the All of Us Research Program and characterizes the properties of the dataset.

• Alexander G. Bick
• , Ginger A. Metcalf
•  &  Joshua C. Denny

Career Column | 01 February 2024

In the AI science boom, beware: your results are only as good as your data

Machine-learning systems are voracious data consumers — but trustworthy results require more vetting both before and after publication.

• Hunter Moseley

Correspondence | 23 January 2024

Funders must get behind brain project data sharing

• Helena Ledmyr
• , Mathew Abrams
•  &  Randy McIntosh

Nature Index | 13 December 2023

News | 30 November 2023

World’s biggest set of human genome sequences opens to scientists

The whole genomes of 500,000 people in the UK Biobank will help researchers to probe our genetic code for links to disease.

• Ewen Callaway

Nature Index | 29 November 2023

Why is China’s high-quality research footprint becoming more introverted?

Data from the Nature Index suggest China-based authors are increasingly publishing without international colleagues.

• Brian Owens

News | 23 November 2023

‘Treasure trove’ of new CRISPR systems holds promise for genome editing

An algorithm that can analyse hundreds of millions of genetic sequences has identified DNA-cutting genes and enzymes that are extremely rare in nature.

• Sara Reardon

Nature Index | 21 November 2023

Nature Index | 08 November 2023

Editorial | 17 October 2023

How to share data — not just equally, but equitably

Just as with many natural resources, wealthy countries have been extracting scientific data from poorer nations for centuries. Researchers are changing that.

Nature Index | 11 October 2023

Nature Index | 06 September 2023

Nature Index | 09 August 2023

News | 03 August 2023

Ancient DNA reveals the living descendants of enslaved people through 23andMe

A landmark genomic study raises the possibility that many more people could find links to distant ancestors through genetic analysis.

News | 02 August 2023

ChatGPT-like AIs are coming to major science search engines

The Scopus, Dimensions and Web of Science databases are introducing conversational AI search.

• Richard Van Noorden

Article 19 July 2023 | Open Access

Mega-scale experimental analysis of protein folding stability in biology and design

Large-scale assays using cDNA display proteolysis are used to measure the folding stabilities of protein domains, providing a method to quantify the effects of mutations on protein folding, with applications in protein design.

• Kotaro Tsuboyama
• , Justas Dauparas
•  &  Gabriel J. Rocklin

Career Column | 13 July 2023

Fourteen things you need to know about collaborating with data scientists

Experimentalists often need help to analyse data. Here’s how to ensure your collaboration is productive.

• Michele Tobias
• , Nick Ulle
•  &  Tyler Shoemaker

Career Column | 05 July 2023

Computer algorithms infer gender, race and ethnicity. Here’s how to avoid their pitfalls

Demographic-prediction algorithms have various challenges, following best practices can minimize the harms.

• Jeffrey W. Lockhart
• , Molly M. King
•  &  Christin L. Munsch

Technology Feature | 27 June 2023

How to make your scientific data accessible, discoverable and useful

Specialists offer seven tips for effectively sharing your data.

• Jeffrey M. Perkel

Nature Index | 15 June 2023

Nature Index Annual Tables 2023: China tops natural-science table

India is another notable riser whereas Russia is among those losing ground.

• Chris Woolston

Correspondence | 13 June 2023

Focus on health for global adaptation to climate change

• Shihui Zhang
• , Wenjia Cai
•  &  Peng Gong

News | 25 May 2023

China’s souped-up data privacy laws deter researchers

Recent regulations have strengthened Chinese data privacy, but are impinging on international research collaboration.

• Dyani Lewis

Major ocean database that will guide deep-sea mining has flaws, scientists warn

As sea-bed mining looms, researchers say better records of sea-floor biodiversity are needed to assess its environmental impact.

• Natasha Gilbert

Nature Index | 09 May 2023

Proposed EU data laws leave researchers out in the cold

Some scientists say the European Commission’s Data Act would favour businesses in its aim to expand access rights to big data, and fear that publicly funded science will suffer.

• Nic Fleming

News Feature | 04 May 2023

GISAID in crisis: can the controversial COVID genome database survive?

The most popular repository for sharing SARS-CoV-2 sequence data has come under increasing scrutiny. Scientists and funders around the world must now consider what lies ahead for the open sharing of genome data.

• Mariana Lenharo

News Feature | 05 April 2023

Diversity in German science: researchers push for missing ethnicity data

The European country is one of several reassessing its cultural unease with collecting information on scientists’ race and ethnicity.

• Hristio Boytchev

Nature Index | 08 March 2023

News | 23 January 2023

Massive health-record review links viral illnesses to brain disease

Study ties common viruses such as flu to Alzheimer’s and other conditions — but the analysis has limitations, researchers warn.

News | 13 January 2023

Researchers blast US agency’s decision not to collect LGBT+ data

Scientists call for the National Science Foundation to add a question about sexual orientation to its 2023 workforce surveys.

Nature Index | 14 December 2022

Nature Index | 07 December 2022

Nature Index | 25 November 2022

News | 11 November 2022

Carbon emissions hit new high: warning from COP27

Fresh data released at the climate summit show global carbon dioxide emissions from fossil fuels are soaring despite energy crisis.

• Jeff Tollefson

World View | 25 October 2022

Cancer research needs better databases

Progress on one of the world’s biggest killers will stall without big registries linking scattered records.

• T. S. Karin Eisinger-Mathason

Nature Index | 14 October 2022

Should AI have a role in assessing research quality?

A UK study aims to find out whether artificial intelligence could ease the peer-review process for the country’s Research Excellence Framework.

• Dalmeet Singh Chawla

Nature Index | 12 October 2022

Correspondence | 04 October 2022

Climate data need shared and open governance

• Marco Schletz
• , Angel Hsu
•  &  Martin Wainstein

Technology Feature | 03 October 2022

Taking the pain out of data sharing

Despite agreeing to make raw data available, some authors fail to comply. The right strategies and platforms can ease the task.

• Matthew Hutson

News | 13 September 2022

Five-year campaign breaks science’s citation paywall

Reference lists for more than 60 million journal studies in Crossref are now free to view and reuse.

Nature Index | 07 September 2022

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Register animal-tracking tags to boost conservation

The COVID-19 pandemic highlighted the value of pooling animal-tracking data — a global tag registry would facilitate data discovery and collaboration.

• Christian Rutz

Correspondence | 06 September 2022

Map soil nutrients to tackle imbalances worldwide

• Ronald Vargas

Nature Index | 10 August 2022

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Major chemical database investigates hundreds of suspicious crystal structures

An unprecedented number of crystallography database entries are undergoing extra checks amid fears that they are based on fabricated data.

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Africa: regulate surveillance technologies and personal data

CCTV cameras and spyware are proliferating in the continent without checks and balances. Governments must legislate locally to prevent civil-rights abuses.

• Bulelani Jili

World View | 15 June 2022

The human microbiome: there is much left to do

It’s time to make the survey of humanity’s ‘second genome’ more complete.

News | 02 June 2022

How science could aid the US quest for environmental justice

Research tools to identify and help protect disadvantaged communities have been in the works for years. Scientists and activists want them put into action.

Browse broader subjects

• Research data
• Computational biology and bioinformatics
• Publication characteristics

Browse narrower subjects

• Genetic databases
• Protein databases

Quick links

• Explore articles by subject
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Citation Databases

• Searching Scopus
• Researcher Profiles
• Researcher IDs
• Searching Web of Science
• Google Scholar
• Research Impact and Metrics

Introduction to Web of Science (WoS)

Web of Science is the oldest, and most used citation database in the world. Managed by Clarivate Analytics, it is a multi-disciplinary repository of research output from global sources. It specializes in collecting abstracts and citations for Social Sciences and Hard Sciences research output, but maintains moderate coverage of the Arts & Humanities. It indexes from 10,000 of the most cited, peer-reviewed journals starting from around the year 1900, with citations starting in 1997.

Metrics in Web of Science

There are a number of different levels of metrics available in WoS. The quickest way to see these is to scroll to the right hand of the screen and view the "metrics" tab in the author or journal profile in WoS. This will display all metrics available with the Purdue subscription.

• << Previous: Researcher IDs
• Next: Searching Web of Science >>
• Last Edited: Apr 11, 2024 9:42 AM
• URL: https://guides.lib.purdue.edu/citationdatabases

An official website of the United States government

Here’s how you know

Official websites use .gov A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS A lock ( Lock A locked padlock ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

https://www.nist.gov/srd/online-scientific-databases

Standard Reference Data

Online scientific databases.

AnthroKids - Anthropometric Data of Children displays the results of two studies on anthropometric data of children.

Atlas of the Spectrum of a Platinum/Neon Hollow-Cathode Lamp in the Region 1130-4330 Å contains wavelengths and intensities for about 5600 lines in the region 4330 Å. An atlas plot of the spectrum is given, with the spectral lines marked and their intensities, wavelengths, and classifications listed.

Atomic Energy Levels and Wavelengths References contained in this database are from Bibliography on Atomic Energy Levels and Spectra, NBS Special Publication 363 and Supplements, as well as current references since the last published bibliography collected by the NIST Atomic Spectroscopy Data Center. These references pertain to atomic structure and spectra that arise from interactions or excitations involving electrons in the outer shells of free atoms and atomic ions, or from inner shell excitations corresponding to frequencies up to the soft x-ray range.

Periodic Table: Atomic Properties of the Elements A periodic table, containing NIST critically-evaluated data on atomic properties of the elements [SP 966] was designed as a NIST handout for use at exhibitions and trade shows. The publication of the handout coincided with NIST's centennial celebration in 2001. One side of the handout (shown below) is available online in two formats (PDF & TIFF), and is suitable for high-resolution color printing for desk or wall-chart display. [The other side of the handout (not available online) contains historical information.]

Atomic Reference Data for Electronic Structure Calculations contains total energies and orbital eigenvalues for the atoms hydrogen through uranium, as computed in several standard variants of density-functional theory.

The NIST Atomic Spectra Database (ASD) contains data for radiative transitions and energy levels in atoms and atomic ions. Data are included for observed transitions of 99 elements and energy levels of 52 elements. ASD contains data on about 900 spectra from about 1 Å (Ångströms) to 200 µm (micrometers), with about 70,000 energy levels and 91,000 lines, 40,000 of which have transition probabilities listed. The most current NIST-evaluated data associated with each transition are integrated under a single listing.

Atomic Spectral Line Broadening Bibliographic Database contains approximately 800 recent references, all collected after the last published bibliography. The database contains number data, general information, comments, and review articles.

Atomic Transition Probability Bibliographic Database provides 6,113 references from 1914 through 1999. These papers contain numerical data, comments and review articles on atomic transition probabilities (oscillator strengths, line strengths, or radiactive lifetimes).

Atomic Weights and Isotopic Compositions the atomic weights are available for elements 1 through 111, and isotopic compositions or abundances are given when appropriate.

Bibliography of Photon Total Cross Section (Attenuation Coefficient) Measurements includes papers reporting absolute measurements of photon (XUV, x-ray, gamma-ray, bremsstrahlung) total interaction cross sections or attenuation coefficients for the elements and some compounds.

NIST Biofuel Database brings together structural, biological, and thermodynamic data for enzymes that are either in current use or are being considered for use in the production of biofuels.

The Biological Macromolecule Crystallization Database and NASA Archive for Protein Crystal Growth Data (BMCD) contains the conditions reported for the crystallization of proteins and nucleic acids used in X-ray structure determinations and archives the results of microgravity macromolecule crystallization studies.

The Ceramics WebBook is an gateway to evaluated data, a guide to data centers and sources and a repository for tools and resources for ceramics.

The NIST Chemical Kinetics Database includes essentially all reported kinetics results for thermal gas-phase chemical reactions. The database is designed to be searched for kinetics data based on the specific reactants involved, for reactions resulting in specified products, for all the reactions of a particular species, or for various combinations of these. In addition, the bibliography can be searched by author name or combination of names. The database contains in excess of 38,000 separate reaction records for over 11,700 distinct reactant pairs. These data have been abstracted from over 12,000 papers with literature coverage through early 2000.

The NIST Chemistry WebBook , sixth edition contains thermochemical data for over 6500 organic and small inorganic compounds, reaction thermochemistry data for over 9800 reactions, IR spectra for over 8700 compounds, mass spectra for over 12,600 compounds, UV/Vis spectra for over 400 compounds, electronic / vibrational spectra for over 4100 compounds, constants of diatomic molecules (spectroscopic data) for over 600 compounds, ion energetics data for over 16,000 compounds, and thermophysical property data for 33 fluids. There are many avenues for searching the database.

CIS2 Visual Interoperability Testbed translates a CIS2 file (CIMsteel Integrations Standards) of a steel structure into a 3D interactive model in the form of a VRML (Virtual Reality Modeling Language) file. The translator is part of the research in developing a mapping between VRML prototypes and CIS2.

CKMech Chemical Kinetics Mechanisms was developed to make available data in a report entitled Thermochemical and Chemical Kinetic Data for Fluorinated Hydrocarbons.

The NIST Computational Chemistry Comparison and Benchmark Database is a collection of experimental and ab initio thermochemical properties for a selected set of molecules. Users are provide a benchmark set of molecules for the evaluation of ab initio computational methods and allow the comparison between different ab initio computational methods for the prediction of thermochemical properties.

Dictionary of Algorithms and Data Structures is a dictionary of algorithms, algorithmic techniques, data structures, archetypical problems, and related definitions. Some entries have links to further information and implementations.

The Digital Library of Mathematical Functions (DLMF) is a compendium of essential properties of the special functions of applied mathematics, which are ubiquitous in mathematical modeling and scientific computing. The DLMF includes references to proof sources for every formula, descriptions of relevant mathematical techniques, illustrative graphics , and links to online research literature, algorithms and software. The DLMF is updated periodically to cite or include new published results.

Electron Interactions with Plasma Processing Gases has data excerpted from recently published articles in the Journal of Physical and Chemical Reference Data (JPCRD). Presented here are collision cross section data and electron transport coefficients for gases, such as CF4 and CHF3, used in the manufacturing of semiconductor devices.

The Elemental Data Index provides access to the holdings of the NIST Physics Laboratory online data organized by element. It is intended to simplify the process of retrieving online scientific data for a specific element.

Engineering Statistics Handbook details numerous methods to help scientists and engineers incorporate statistical methods in their work.

Fire Research Information Services (FRIS) is a resource for fire protection engineers, scientists, and fire service personal. It includes FIREDOC which is a complete fire research bibliographic database with 55,000 holdings (published reports, journal articles, conference proceedings, books, and audiovisual items) of FRIS. Each reference has complete bibliographic information.

FLYCHK Collisional-Radiative Code FLYCHK provides a capability to generate atomic level populations and charge state distributions for low-Z to mid-Z elements under NLTE conditions.

Frequencies for Interstellar Molecular Microwave Transitions presents critically evaluated transition frequencies for the molecular transitions detected in interstellar and circumstellar clouds.

CODATA Fundamental Physical Constants , developed in the Physics Laboratory at NIST, addresses three topics: fundamental physical constants, the International System of Units (SI), which is the modern metric system, and expressing the uncertainty of measurement results.

Fundamental Physical Constants - International System of Units (SI) lists important definitions related to the modern metric system of measurement.

Fundamental Physical Constants - Searchable Bibliography on the Constants contains citations for the most important theoretical and experimental publications relevant to the fundamental constants and closely related precision measurements published since the mid 1980s.

Ground Levels and Ionization Energies for the Neutral Atoms provides data for ground state electron configurations and ionization energies for the neutral atoms (Z = 1-104) including references.

The Guide to Available Mathematical Software studies techniques to provide scientists and engineers with improved access to reusable computer software components which are available to them for use in mathematical modeling and statistical analysis. It provides centralized access to such items as abstracts, documentation, and source code of software modules that it catalogs.

Guidelines for Evaluating and Expressing the Uncertainty of NIST Measurement Results presents a method of evaluating and expressing uncertainty in measurement adapted from NIST Technical Note 1297.

NIST Heat Transmission Properties of Insulating and Building Materials provides a valuable reference for building designers, material manufacturers, and researchers in the thermal design of building components and equipment. NIST has accumulated a valuable and comprehensive collection of thermal conductivity data from measurements performed with a 200-mm square guarded-hot-plate apparatus (from 1933 to 1983).

NIST High Temperature Superconducting Materials Database provides evaluated thermal, mechanical, and superconducting property data for oxides and other nonconventional superconductors.

NIST Interactive Algorithm for Isotopic CO2 Measurements is a web-based tool for converting carbon dioxide isotope measurements into standardized delta 13-C and delta-18-O values.

The International Comparisons Database provides information on Appendices B and D of the Comité International des Poid et Mesures (CIPM) Mutual Recognition Arrangement (MRA). The official source of the data is the BIPM key comparison database. The ICDB provides access to results of comparisons of measurements and standards organized by the consultative committees of the CIPM and the Regional Metrology Organizations.

The NIST ITS-90 Thermocouple Database contains the most commonly used tables of NIST Monograph 175, "Temperature-Electromotive Force Reference Functions and Tables for the Letter-Designated Thermocouple Types Based on the ITS-90," by Burns, Kaeser (formerly Scroger), Strouse, Croarkin, and Guthrie. These reference functions have been adopted as standards by the American Society for Testing and Materials and the International Electrotechnical Commission.

The Matrix Market Database is a visual repository of test data for use in comparative studies of algorithms for numerical linear algebra, featuring nearly 500 sparse matrices from a variety of applications, as well as matrix generation tools and services.

NLTE4 Plasma Population Kinetics Database Welcome to the NIST NLTE-4 Plasma Kinetics Modeling Database! This database contains benchmark results for simulation of plasma population kinetics and emission spectra. The data were contributed by the participants of the 4th Non-LTE Code Comparison Workshop who have unrestricted access to the database. The only limitation for other users is in hidden labeling of the output results. Guest users can proceed to the database entry page without entering userid and password.

Phase Diagrams and Computational Thermodynamics - Solder Systems predicts melting temperatures and freezing ranges of lead-free solders which are used to remove lead-containing components from commercial products. This database also shows the effects of non-equilibrium solidification. Also included is a collection of calculated binary and ternary systems that are relevant to solders.

NIST Property Data Summaries for Advanced Materials are topical collections of property values derived from surveys of published data. Thermal, mechanical, structural, and chemical properties are included in the collections.

The Protein Data Bank PDB is the single worldwide repository for the processing and distribution of 3-D biological macromolecular structure data.

It is currently managed by a collaboration of - Rutgers University, Univ. of California - San Diego and NIST.

Radionuclide Half-Life Measurements presents the half-lives of many radionuclides measured at NIST. Revised values for the half lives of various "short-lived" radionuclides arise from improved impurity analysis, incorporation of additional data from new sources, and reevaluation of old data.

NIST Recommended Rest Frequencies for Observed Interstellar Molecular Microwave Transitions -1991 Revision provides critically evaluated transition frequencies for the molecular transitions detected in interstellar and circumstellar clouds. The tabulated transitions are recommended for reference in future astronomical observations in the microwave and millimeter wavelength regions.

SAHA Plasma Population Kinetics Database Welcome to the NIST Saha Plasma Kinetics Modeling Database. This database contains benchmark results for simulation of plasma population kinetics and emission spectra. The data were contributed by the participants of the 3rd Non-LTE Code Comparison Workshop who have unrestricted access to the database. The only limitation for other users is in hidden labeling of the output results. Guest users can proceed to the database entry page without entering userid and password.

Short Tandem Repeat DNA Internet Database is intended to benefit research and application of short tandem repeat DNA markers for human identity testing. Facts and sequence information on each STR system, population data, commonly used multiplex STR systems, PCR primers and conditions and a review of various technologies for analysis of STR alleles have been included.

The Statistical Reference Datasets is also supported by the Standard Reference Data Program. The purpose of this project is to improve the accuracy of statistical software by providing reference datasets with certified computational results that enable the objective evaluation of statistical software.

Stopping-Power and Range Tables for Electrons, Protons & Helium Ions The databases ESTAR, PSTAR, and ASTAR calculate stopping-power and range tables for electrons, protons, or helium ions, according to methods described in ICRU Reports 37 and 49. Stopping-power and range tables can be calculated for electrons in any user-specified material and for protons and helium ions in 74 materials.

NIST Structural Ceramics Database (WebSCD) provides evaluated materials property data for a wide range of advanced ceramics known variously as structural ceramics, engineering ceramics, and fine ceramics.

Tables of X-Ray Mass Attenuation Coefficients and Mass Energy - Absorption Coefficients from 1keV to 20 MeV for Elements Z = 1 to 92 and 48 Additional Substances of Dosimetric Interest include tables covering energies of the photon (x-ray, gamma ray, bremsstrahlung) from 1 keV to 20 MeV.

Thermodynamics of Enzyme-Catalyzed Reactions Database contains thermodynamic data on enzyme-catalyzed reactions that have been recently published in the Journal of Physical and Chemical Reference Data (JPCRD). For each reaction the following information is provided: the reference for the data, the reaction studied, the name of the enzyme used and its Enzyme Commission number, the method of measurement, the data and an evaluation thereof.

ThermoPlan   - NIST Standard Reference Database #167 Experimental Planning and Coverage Evaluation Aid for Thermophysical Property Measurements

This web application provides free and open access for the broader research community to the experimental planning utilities that are incorporated into ThermoData Engine (TDE) [J. Chem. Inf. Model. 2005, 45, 816-838]. TDE provides recommendations for the relative merit of a proposed measurement via assessment of the existing body of knowledge, including availability of experimental thermophysical property data, variable ranges studied, associated uncertainties, state of prediction methods, and parameters for deployment of prediction methods. The web applications provides utilities for the assessment of specific property measurements for pure and binary chemical systems, the broader data needs of pure systems, and recommendations for binary mixture measurements that could extend the current UNIFAC model.

The Database of the Thermophysical Properties of Gases Used in the Semiconductor Industry concerns transport and thermodynamic property data for the gases used in semiconductor processing. The data are useful for equipment modeling in chemical vapor deposition (CVD) processes and the data will also provide a rational basis for the calibration of mass flow controllers (MRCs) used to meter process gases.

The NIST Visible Cement Dataset consists of data on cement pastes with ratios between 0.3 and 0.45 that were prepared and viewed after various hydration times.

Wavenumber Calibration Tables from Heterodyne Frequency Measurements contains the bibliography and atlas as updated through November 1994. The atlas and wavenumber tables consist of many pages of spectral maps accompanied by tables of transition wavenumbers and their identity.

XCOM: Photon Cross Sections Database can be used to calculate photon cross sections for scattering, photoelectric absorption and pair production, as well as total attenuation coefficients, for any element, compound or mixture (Z <= 100) at energies from 1 keV to 100 GeV.

X-Ray Attenuation and Absorption for Materials of Dosimetic Interest Tables and graphs of the photon mass attenuation coefficient and the mass energy-absorption coefficient are presented for all of the elements Z = 1 to 92, and for 48 compounds and mixtures of radiological interest. The tables cover energies of the photon (x-ray, gamma ray, bremsstrahlung) from 1 keV to 20 MeV.

X-Ray Form Factor, Attenuation and Scattering Tables this database collects tables and graphs of the form factors, the photoabsorption cross section, and the total attenuation coefficient for any element (Z <=92).

The NIST X-ray Photoelectron Spectroscopy (XPS) Database gives easy access to the energies of many photoelectron and Auger-electron spectral lines. Resulting from a critical evaluation of the published literature, the database contains over 19,000 line positions, chemical shifts, doublet splittings, and energy separations of photoelectron and Auger-electron lines. A highly interactive program allows the user to search by element, line type, line energy, and many other variables.