The role of androgen in increasing calcium retention was elucidated in balance experiments designed to imitate the normal physiological course of retention just before laying. In these earlier experiments neither androgen alone nor estrogen alone evoked a statistically significant increase in calcium retention, even although the estrogen was given in amounts sufficient to increase greatly the serum calcium. [...]

Casein was first recognized as a component of milk by Scheele in 1780. For many years casein was regarded as a chemical individual remarkable among proteins for its ease of isolation in a relatively pure state, and for this reason has probably been the subject of more investigations than any other protein.

Research workers who have carried out experiments with animals or birds have sought a protein free from vitamins and having a high biological value. Many workers have used casein for this purpose. The B-vitamins have usually been removed from casein by prolonged extraction with either dilute acid or organic solvents such as ethanol and methanol. Several patents issued for the preparation of low vitamin casein describe extraction procedures with such solvents.

The method of Elson and Morgan for the determination of hexosamine is based on acetylation in alkaline solution to form a product that gives a colour with p-dimethylamino-benzaldehyde in acid solution. The thesis describes a modification of this method applicable to acid hydrolyzates of tissues.

The cultivation of the Timothy plant as a forage crop has been practised in various countries particularly in Canada and the United States of America for a considerable length of time. As such a knowledge of the variation in the composition of the plant at different periods of growth and maturity with a view to reflect the nutrient status of the plant and to indicate the levels of nutrient components at which effects due to deficiencies and excesses may be expected becomes important.

Research with the domestic fowl has played an important part in the development of knowledge in fundamental endocrinology. The experiments of Hunter with domestic fowl in 1749 appear to constitute the first experimental demonstration of what would now be described as hormonal action by the gonad. Similarily, the experiments of Berthold in 1849 on the transplantation of fowl testes are regarded as the first demonstration of an endocrine secretion. [...]

It may be regarded as established that exogenous estrogen administered orally or by injection induces increases in the liver lipid, liver crude protein, total liver ribonuoleic acid phosphorus (RNAP) and to a lesser extent, total liver deoxyribonucleic acid phosphorus (DNAP) of the immature fowl. Furthermore, it has been shown that estrogen induces great increases in the serum lipid. This increase in large measure represents an increase in phospholipid and it is associated with an increase in serum phosphoprotein, which is also evoked by estrogen. It is further known that estrogen induces great increases in the level of the serum calcium especially of the non-diffusible traction.

Thesis (Ph. D.)--Indiana University, Dept. of Chemistry, 2007. / Source: Dissertation Abstracts International, Volume: 68-07, Section: B, page: 4435. Adviser: Gary M. Hieftje. Title from dissertation home page (viewed Apr. 15, 2008).

A synthetic substrate of highly reproducible composition was used to study the nitrogen and phosphorus requirements of the microorganisms and settling characteristics of activated sludge. The study showed that the production of biological growth or activated sludge with maximum nitrogen and phosphorus contents, required a substrate with BOD:N and BOD:P ratios not wider than 19:1 and 81:1, respectively. To produce an activated sludge with optimum nitrogen and phosphorus contents, the BOD:N and BOD:P ratios of the substrate should not be wider than 23:1 and 168:1. A highly significant interaction existed between the quantities of nitrogen and phosphorus required by the activated sludge microorganisms. The phosphorus requirements increased logarithmically with the quantity of nitrogen consumed. Bulking of activated sludge was caused by wide BOD:N and BOD:P ratios of the substrate and the presence of a filamentous bacterium, Sphaerotilus sp., in the sludge. Bulking was most severe when the substrate had BOD:N and BOD:P ratios wider than 37:1 and 420:1, respectively. Sphaerotilus organisms were present in all sludges, but their growth was favoured by wide BOD:N and BOD:P ratios of the substrate. / Land and Food Systems, Faculty of / Graduate

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