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PubChem is a database of chemical molecules and their activities against biological assays. The system is maintained by the National Center for Biotechnology Information (NCBI), a component of the National Library of Medicine, which is part of the United States National Institutes of Health (NIH). PubChem can be accessed for free through a web user interface. Millions of compound structures and descriptive datasets can be freely downloaded via (FTP ). PubChem contains substance descriptions and small molecules with fewer than 1000 atoms and 1000 bonds. More than 80 database vendors contribute to the growing PubChem database. == Databases == PubChem consists of three dynamically growing primary databases. As of 29 September 2014: * Compounds, 54 million entries 〔(【引用サイトリンク】title=Search Results for all compounds )〕 (up from 31 million entries in Jan 2011), contains pure and characterized chemical compounds. * Substances, 163.5 million entries (up from 75 million entries in Jan 2011), contains also mixtures, extracts, complexes and uncharacterized substances. * BioAssay, bioactivity results from 6059 (up from 1644 in Jan 2011) high-throughput screening programs with several million values. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「PubChem」の詳細全文を読む スポンサード リンク
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