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Academy of American Poets
2 天
Poem-a-Day
The only daily poetry series publishing new work by today’s poets.
Gemological Institute of America
5 天
Bench Tip #9: Use the Touchstone Method for Testing Purity in Karat Gold
Careful procedures are a must. Touchstone testing is based on the fact that 24k gold resists all but the strongest acids. The purer the gold, the stronger the acid required to dissolve it. Measured ...
21food.cn
5 天
α-酮戊二酸钙 食品级钙盐 CA-AKG高含量99% 71686-01-6
营养补充剂:α-酮戊二酸钙盐也被用作人类营养补充剂的成分之一,有助于维持代 谢平衡。 制法: - α-酮戊二酸钙盐可以通过将α-Ketoglutaric acid和氢氧化钙反应得到。 - 具体制备方法可以是将氢氧化钙溶解在水中,然后将α-Ketoglutaric acid加入到 溶液中反应 ...
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