摘要:

The hydantoin of lysine was fed to rats on a lysine-free diet and was shown to have no growth promoting effect. This hydantoin, therefore does not appear to give rise to the corresponding α-amino acid in contrast with results obtained elsewhere with diphenylhydantoin in man and dog.

ISSN:1923-4287    

DOI:10.1139/cjr47e-021

出版商:NRC Research Press    

年代:1947

数据来源: NRC

摘要:

RearedAedes aegypti(Linnaeus) mosquitoes fed under controlled conditions in the laboratory are used to determine the degree of specificity of the precipitin reaction as used in the study of mosquito feeding habits. Three hosts for which antisera have been prepared are used, namely, human, rabbit, and guinea pig. The experiments disclose (1) a high degree of specificity (over 95%) for the precipitin reaction as used in this connection, (2) that multiple reactions signify multiple feedings, and (3) that significant results can be secured by applying the test to undistended mosquitoes from a field collection.

ISSN:1923-4287    

DOI:10.1139/cjr47e-022

出版商:NRC Research Press    

年代:1947

数据来源: NRC

摘要:

The relation of dietary protein to susceptibility of the rat to trauma has been investigated. Protein levels of from 13 to 18% with a daily intake of 1 to 1.5 gm. appeared to give the greatest protection. Levels of casein, Amigen, and wheat germ protein as low as 8.4% were effective. Protection was afforded by diets too low in adequate protein to support growth, and by the incomplete protein gelatin. Tolerance to trauma on these diets was somewhat decreased if the vitamin B complex was omitted from the diets for two weeks. This was particularly evident at very high levels of protein intake. Body weight changes were unrelated to the tolerance of the rats to trauma. The complete absence of protein from the diet previous to trauma greatly increased the susceptibility of rats to shock. The time required to bring about either increased or decreased tolerance to trauma was much shorter in young than in adult animals. Although stock rats lost their normal tolerance, and resistant rats their acquired resistance to trauma when deprived of protein, it was possible to develop or maintain such resistance if trauma was administered at intervals during the time that the animals were maintained on the protein-free diet.

ISSN:1923-4287    

DOI:10.1139/cjr47e-023

出版商:NRC Research Press    

年代:1947

数据来源: NRC

摘要:

Rats, following periods of protein depletion, showed a decreased tolerance to trauma. Protein feeding restored normal tolerance but five or six days feeding was necessary to correct two weeks' depletion. The amount of protein consumed was an important factor when low levels of 0.08 to 0.68 gm. per day were used. Casein, Amigen, and wheat germ protein were effective for replacement. After protein depletion of one month or more, two or three weeks of protein feeding was required to restore normal tolerance. No individual amino acid was found to afford protection against trauma although a mixture of the essential amino acids in one case had some effect. Gelatin was an effective protein for replacement therapy. In a single experiment in which a mixture of glutamic acid and glycine of the same total nitrogen content as gelatin was administered, the same degree of protection was afforded as by gelatin.

ISSN:1923-4287    

DOI:10.1139/cjr47e-024

出版商:NRC Research Press    

年代:1947

数据来源: NRC