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Nitrogenase is the enzyme used by some organisms to fix atmospheric nitrogen gas. It is only known family of enzymes which accomplishes this process. Thursday, 14 January 2010. 61656; Azospirillum, a bacterium, growing on root surface of several tropical grasses, also fixed nitrogen. This combination where the nitrogen fixing micr. The first species of Rhizobium, R. Leguminosarum was identified in 1889, and all further species were placed in the genus Rhizobium.
4 - Dark Chestnut Brown. 5 - Dark Ash Brown. 6 - Medium Chestnut Brown. 7 - Medium Ash Brown. 8 - Light Chestnut Brown. 9 - Light Ash Brown. 14 - Light Caramel Brown. 16 - Light Golden Brown. 18 - Dark Ash Blonde. 20 - Natural Ash Blonde. 24 - Light Golden Blonde. 55 - Light Ash Blonde.
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