| 41. | N581 chelates the divalent magnesium cation associated with ATP to help orient the molecule for optimal substitution.
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| 42. | Aromatic hydroxyaldehydes to divalent phenols ( Dakin reaction ) and gives under suitable conditions the corresponding benzoic acids.
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| 43. | Nanofilters can soften water by retaining scale-forming, hydrated divalent ions ( e . g.
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| 44. | The divalent calcium in lime acts as a cross-linking agent for protein and polysaccharide acidic side chains.
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| 45. | The light and heavy chains of Factor Va are linked via a divalent metal ion, such as calcium.
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| 46. | Divalent iron ( Fe ) and magnesium ( Mg ) readily substitute for the manganese in the crystal structure.
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| 47. | Ferrochelatase is the best known member of a family of enzymes that add divalent metal cations to tetrapyrrole structures.
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| 48. | Sm is a typical and well studied metal due to its unusual stability in a divalent and trivalent state.
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| 49. | Divalent metal ions, especially artificially designed structures used in DNA nanotechnology, such as the double crossover motif.
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| 50. | Activity greatly depends on the presence of a divalent copper ion and a reductant such as gallate or ascorbate.
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