This keeps the acidity of those fluids constant.
这使得酸性的物质持续的流动。
The exchangeable acidity in constant charge soils is pronouncedly larger than that in variable charge soils.
恒电荷土壤的可交换性酸量明显大于可变电荷土壤。
We furthermore found that an appropriate buffer ion can intensify the binding although its concentration and acidity remain constant (8).
我们进一步发现适合的缓冲离子能强化结合，虽然它的浓度和酸度都保持不变。
The rate constant of racemization of L-Pro increased with decreasing acidity of the carboxylic acid. However, the racemization of L-His was most rapid in acetic acid.
消旋速率因羧酸溶剂的不同而异：L-组氨酸在乙酸溶剂中消旋最快，而L-脯氨酸在正丁酸溶剂中最快。
The rate constant of racemization of L-Pro increased with decreasing acidity of the carboxylic acid. However, the racemization of L-His was most rapid in acetic acid.
消旋速率因羧酸溶剂的不同而异：L-组氨酸在乙酸溶剂中消旋最快，而L-脯氨酸在正丁酸溶剂中最快。
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