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Exposition essay definition

An important property of steroids is polarity —i. Brassinosteroids They are derivatives of cholestane with two vicinal diols C-2, C-3 and C, C and a 6-keto group.

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Structural formula of cholesterol. The major corticosteroids in vertebrates are cortisol which has an steroid and photosynthesis group at C, C, and C glucocorticoid hormone and aldosterone which has only one hydroxyl group at C and one aldehyde function at C mineralocorticoid hormone.

Steroid contraceptives

They are oxygenated C27 steroids with an hydroxyl group in C Several testosterone derivatives are present in human male secretions such as sweat, saliva, and semen and have been implicated as putative human pheromones. Ingestion of these C-nor-D-homosteroids results in birth defects in lambs: Thus, diosgenin can be chemically converted into corticosteroids, estrogens and progesterone.

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Cardiotonic steroids Preparations in which cardiotonic steroids of both vegetable and animal origin are the active principles have been used as emetics, diureticsand arrow poisons for centuries. Some important sterols and their sources common name. In all cases, the aglycone the steroid that results when the sugar groups are removed is less active than its glycosides, but generally activity declines with increasing numbers of sugar residues after the first.

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