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ข้อคิดเห็นที่
1: อ้างคำตอบจาก FAQ ของ Chemical Abstract Service (CAS) Question: What is a CAS Registry Number? Answer: CAS Registry Numbers (often referred to as CAS RNs or CAS Numbers) are unique identifiers for chemical substances. A CAS Registry Number itself has no inherent chemical significance but provides an unambiguous way to identify a chemical substance or molecular structure when there are many possible systematic, generic, proprietary, or trivial names. CAS Registry Numbers are used in many other public and private databases as well as chemical inventory listings and, of course, are included in all CAS-produced databases. เพิ่มเติมดูที่ http://www.cas.org/expertise/cascontent/registry/regsys.html โดย: ปั๊ป [9 ก.ค. 2551 17:33](แก้ไขล่าสุด: 10 ก.ค. 2551 12:15) |