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   Category: Science>  
   A repository of information related to chemical structures and other associated information. It includes more than 18 million chemical structures.
   This site contains interactive 3D animations for some of the most important organic reactions covered during an undergraduate chemistry degree with supporting information on reactivity and spectroscopy.
       Dynamic Periodic Table
   Offers a range of possibilities for obtaining further information about elements including physical properties, abundance, date of discovery, isotopes (with decay type), and electron distribution.
   Single-click access to physical, electronic and thermodynamic properties for all elements. Includes a number of calculators.
       Linus Pauling Online
   This site, maintained by Oregon State University, is a compendium of Pauling's contributions to the understanding of molecules.
   Electronic version of one of the most trusted names in scientific literature. Includes abstracts to the journal articles, as well as news briefs, blogs, special reports and podcasts.
   Information on the biological activities of small molecules. It is organized as three linked databases within the National Center for Biotechnology Information Entrez information retrieval system: substance search, compound search and BioAssay search.
       Science Research is a free, publicly available deep web search engine that uses advanced "federated search technology" to return high quality results by submitting your search query - in real-time - to other well respected search engines such as OAIster, PubMed, Science Direct and Directory of Open Access Journals.
   Search engine for government science information. Areas divided by subjects such as Agriculture, Applied Science & Technology, Astronomy & Space, Computers & Communication, Earth & Ocean Science, Energy, Environment, Health & Medicine, Math, Physics & Chemistry, Natural Resources, and Science Education
   Databases on toxicology, hazardous chemicals, environmental health, and toxic releases from the National Libray of Medicine.
       Wired Chemist
   The site offers features such as pedagogical animations, an introduction to chemistry, modules on important topics in chemistry, demonstrations of laboratory techniques, NMR spectral data and problems, and so on. All of these are designed to help students learn chemistry and to provide professionals with information of value. .
       World Wide Science
   A global science gateway—accelerating scientific discovery and progress through a multilateral partnership to enable federated searching of national and international scientific databases and portals.