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By I. Chester Jones

ISBN-10: 0121715027

ISBN-13: 9780121715021

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Sample text

It is more or less associated with 5-4 isomerase and is able to convert dehydroepiandrosterone (DHA) or pregnenolone into corresponding 4-3 ketosteroids, androstenedione or progesterone. Wattenberg (1958) applied the method at the histochemical level and with the modification of Levy et aL (1959) is widely used. Steroid-producing glands of many animals have been examined (see Baillie et aL, 1966) and cells, when positive, are stained blue by the diformazan salt (Fig. 11). The distribution of the enzyme activity in the adrenal cortex varies with the species, age, sex and physiological state.

The question whether artefacts have been created by the methods of processing of tissues is always difficult to answer. The concept of "characteristic artefact" might be applied to the light and dark cells (or clear and compact cells) (see Section 7, C). Nussdorfer (1969) has applied morphometric methods to the ultrastructural characteristics of these elements. The light cells have more abundant SER and lipid droplets than the dark cells which, on the other hand, have a greater number of mitochondria.

A reaction is given throughout the cortex but of course there are variations concomitant with age, sex and physiological status. Thus the reaction is weaker in the zona glomerulosa of the rat and stronger in that of the hamster compared with other zones. A C T H , as would be expected, increases the activity (NADH tetrazolium reductase). Usually there is some increase after metyrapone treatment though a decrease sometimes occurs as it does after cortisol administration (Malendowicz, 1973). e. 01 μτηο\ of NADP per min at 25°C (Glock and McLean, 1954).

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General, Comparative and Clinical Endocrinology of the Adrenal Cortex by I. Chester Jones


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