melting point

Nonnatural amino acid 3-(4-thiazolyl)-D,L-alanine hydrochloride and its four intermediates were synthesized, their structures were detenmined by IR,NMR,elementary analysis and melting point.

合天然氨基酸3-(4-噻唑基)-D，L-丙氨酸盐酸盐以及三个中间体，其结构分别通过红外光谱、核磁共振、元素分析、点等测试手段得到确证。

The structure and working principle of the devices for melting point measurement by means of thin film comparative method of cryoscopy were introduced.

介绍凝固点下降薄层比较法测量点标准物质点的测量装置的构原理。