The ions exchange between calcium ions and zinc ions in L-guluronic acid units would influence the binding ability of zinc ion in D-mannuronic acid units.

钙锌离子交换试验表明钙离子与锌离子在海藻酸古洛糖醛酸片段的离子交换会影响锌离子与甘露糖醛酸片段的结合。

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Nonnatural amino acid 3 (4 thiazolyl) D, L alanine hydrochloride and its four intermediates were synthesized.

合成了非天然氨基酸3（4噻唑基）D，L丙氨酸盐酸盐及其四个中间体。

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The ions exchange between calcium ions and zinc ions would influence the binding ability of zinc ion in D-mannuronic acid units.

钙锌离子交换会影响锌离子与甘露糖醛酸片段的结合。

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Over two decades, researchers have seen increased use of calcium, vitamin D and folic acid.

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It said vitamin D and folic acid supplements should be offered by health staff to help ward off conditions such as rickets and spina bifida.

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Health experts now recommend that women who are planning to become pregnant take a supplement of vitamin D as well as folic acid.

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