ON THIS PAGE:

• Conversion of Units  Converts more than 500 of SI, Anglo-American, and many obscure units (including major currencies)
• Measurements Converter  Converts the most popular SI, American, British, German,  Russian, and Ancient Roman units. User friendly interface converting to all alternative units simultaneously.
• Temperature Converter  Converts between scales of  Celsius, Fahrenheit, Réaumur, Kelvin, and Rankine
• Dictionary of Units  not a dictionary per se, but provides explanations of units and calculators for conversion between different units
• Dictionary of Units  A Dictionary of Units of Measurement with excellent introductory notes
• Currency Converter  This "Universal Currency Converter" contains information on 180 currencies in over 250 geographical locations of the World.
• Radioactivity Calculator  Performs routine radioactivity calculations for the following isotopes: 125I, 32P, 33P, 35S, 3H. For other isotopes you need to know the half-life (see Periodic Tables below or "Radioactivity" subsection on page "Reagents"). See also Nomenclature of Isotopically Modified Compounds
• Molecular Weight  Calculator using chemical molecular formula
• Specialist Calculators  2-D and 3-D shapes, percentage, cost, living index, etc

• Periodic Tables
• From the Chemistry Societies Network NB: good but slow loading
• From the Los Alamos National Laboratory's Chemistry Division
• WebElements Periodic Table
• Periodic chart of elements with links to pages that explain chemical properties,  health effects, environmental effects, application data, an image and also information of the history/inventor of each element.
  
• Elements of Atomic Numbers 101-900
• Chemical Nomenclature
• Organic Chemistry (Blue Book), IUPAC with search option
• Organic Class Names
• Basics of Organic Nomenclature, An Introduction
• Biochemical Nomenclature (White Book), IUPAC-IUBMB with a search option
• Glossary of Terms in Bioinorganic Chemistry
• Glossary of Terms in Physical Organic Chemistry
• Glossary of Terms in Medicinal Chemistry
• Numerical Terms in Chemical Formulae
• Natural Products and Related Compounds
• IUPAC "Colour Books" on chemical nomenclature, terminology, symbols and units
• Gold Book -- Compendium of Chemical Terminology, see mirror at IUPAC
• Blue Book -- Nomenclature of Organic Chemistry
• Green Book -- Quantities, Units and Symbols in Physical Chemistry.
• Orange Book -- Compendium of Analytical Nomenclature
• Purple Book -- Compendium of Macromolecular Nomenclature
• Red Book -- Nomenclature of Inorganic Chemistry
• White Book -- Biochemical Nomenclature and Related Documents
• Silver Book -- Terminology and Nomenclature of Properties in Clinical Laboratory Sciences 
• Chemical compounds: formulae, synonims, properties, and other info.
• see Reagents: Chemicals
• Portal websites
• Chemistry Index
• Analytical Chemistry Springboard
• ChemCenter -- American Chemical Society Online
• The Othmer Library of Chemical History

• Nomenclature
• Nomenclature and Symbolism for Amino Acids and Peptides by IUPAC-IUB
• Selenocysteine abbr. Sec or X
• Abbreviated Nomenclature of Synthetic Polypeptides (Polymerized Amino Acids)
• Abbreviations and Symbols for the Description of the Conformation of Polypeptide Chains by IUPAC-IUB
• Properties
• Amino Acids This table provides the following information: Symbol (one and 3 letter), Mass (-H2O), chemical formula for the side chain, and Occurrence (in %). See also Amino Acid Properties for other biochemical and structural information.
• AA This table provides the following information: Symbol (one and 3 letter), and linear chemical formula. Clicking on the AA name gives: Total Molecular Formula, Molecular Mass, Isoelectric Point, CAS Registry Number, and 3D Molecular Structure.

• Abbreviations and Symbols for Nucleic Acids, Polynucleotides and their Constituents by IUPAC-IUB Commission on Biochemical Nomenclature
• Nomenclature for Incompletely Specified Bases in Nucleic Acid Sequences by Nomenclature Committee of the International Union of Biochemistry (NC-IUB) with allocation of symbols
• Nucleotides Table of the ribonucleotides and deoxyribonucleotides. The table shows the molecular weight (g/mol) of the nucleoside, the monophosphate, and the triphosphate. A DNA base pair constitutes two mono-phosphorylated nucleotides
• Nucleotide Names  Nucleotide translation conventions adopted by different databases

• Standard Genetic Code  Recommended by Nomenclature Committee of the International Union of Biochemistry (NC-IUB)
• Standard Genetic Code  Table of Standard Genetic Code from NIH
• CodonUsageDB  Codon Usage Database for all organisms, chloroplasts, mitochondria, and viruses (listed as others). With an option to search the database for the Latin name of an organism
• Universal and Non-canonical  Genetic Codes
• DOGenomeSizes  Database Of Genome Sizes. Provides a comprehensive list of (estimated) genome sizes for different organisms. The ultimate goal is to compile a list of all the known organisms and their respective genome sizes. Both the completed and estimated genomes are listed. The estimated genome sizes are given for both the organisms currently being sequenced and those for which no sequencing programme is in progress

• World Species List  Animals Plants Microbes
• Guide to the Animal Kingdom
• Index to Organism Names  The Index to Organism Names gives basic nomenclatural and hierarchy information for animal names, and links to other organizations' data for non-animal names. It can be used to identify the taxonomic group to which an organism belongs and to link to further information from Zoological Record or other collaborating organization
• Botanical Nomenclature  International Code of Botanical Nomenclature (Tokyo Code), Electronic version. Adopted by the Fifteenth International Botanical Congress, Yokohama, August-September 1993
• Bacterial Nomenclature
• Viral Nomenclature  From  The International Committee on Taxonomy of Viruses. To search for a virus name, visit Index Virum

See also subsection Hazardous Materials and Safety

• Human Subjects:
• OHRP Office for Human Research Protections
• Code of Federal Regulations: Federal Policy for the Protection of Human Subjects
• NGC National Guideline Clearinghouse is a public resource for evidence-based clinical practice guidelines. NGC is sponsored by the Agency for Healthcare Research and Quality (AHRQ) (formerly the Agency for Health Care Policy and Research [AHCPR]) in partnership with the American Medical Association and the American Association of Health Plans.
• National Guideline Clearinghouse
• Primary Care Clinical Practice Guidelines
• CDC Prevention Guidelines Database is a comprehensive compendium of all of the official guidelines and recommendations published by the US Centers for Disease Control and Prevention for the prevention of diseases, injuries, and disabilities.
• Recombinant DNA:
• OBA Office of Biotechnology Activities, NIH
• Guidelines for Research Involving Recombinant DNA Molecules
• Laboratory Animals:
• Guide for the Care and Use of Laboratory Animals, Institute of Laboratory Animal Resources, Commission on Life Sciences, National Research Council, National Academy Press Washington, D.C., 1996
• Essentials for Animal Research: A Primer for Research Personnel, USDA, National Agricultural Library
• Guidelines for the Euthanasia of Mouse and Rat Fetuses and Neonates, NIH
• OACU Office of Animal Care and Use of NIH provides oversight and programmatic assistance to animal science specialists, and other NIH staff involved in the conduct of biomedical research. 
• OLAW Office of Laboratory Animal Welfare, NIH
• ARAC Animal Research Advisory Committee issues guidelines on animal use in biomedical research. 
• Government and Law Resources: Animal Welfare Information Center, National Agricultural Library
• Animal Welfare Act and Regulations
• European Convention on the Protection of Vertebrate Animals used for Experimental and other Scientific Purposes.
• ILAR Journal, publication of the Institute for Laboratory Animal Research, formerly ILAR News
• Laboratory Animals

• Dorland's Illustrated Medical Dictionary
  
• Merck Manual of Diagnosis and Therapy  Seventeenth (Centennial) Edition 
• Kimball's  Biology Pages based on a popular textbook. There is an alternative site for this textbook
• MicroTextBook  Microbiology Text Book from University of Wisconsin-Madison
• Medical Microbiology Textbook.  Fourth Editon, Edited By Samuel Baron.
• THCME  The THCME Medical Biochemistry Page
• MIT Biology  Hypertextbook developed by the Experimental Study Group
• Molecular Genetics
• Psychopharmacology, an online publication from The American College of Neuropsychopharmacology
• Biophysics Texbook Online