منابع مشابه
Frequency and structure of macrophages and abnormal sperm cells in guinea fowl semen.
Semen from young and old guinea fowl was examined for macrophages and abnormal sperm cells. Large numbers of macrophages were found in the semen from both groups. However, there were significantly more abnormal sperm cells in the semen of the young males. The abnormal cells consisted of large coiled cells, bent spermatozoa, and round-headed cells. The predominant abnormality in the young males ...
متن کاملFree amino acids in the semen of the fowl and the turkey.
A total of eighteen amino acids were determined quantitatively in the seminal plasma and spermatozoa of fowl semen. Glutamic acid was the major component in both fractions. In the spermatozoan fraction, only six amino acids were detected, namely glutamic acid, lysine, arginine, serine, aspartic acid and threonine. Except for serine and lysine, the amino acid concentrations in the spermatozoan f...
متن کاملGlycosidases – A Mechanistic Overview
Carbohydrates are the most abundant and structurally diverse class of biological compounds in nature. However, our current understanding regarding the relationship between carbohydrate structure and its biological function is still far from what is known regarding proteins and nucleic acids. Initially, carbohydrates were only recognized as structural and energy storage molecules (e.g. cellulose...
متن کاملGlycosidases of Aspergillus niger
A highly purified preparation of 1,2-oc-L-fucosidase, free of /3-galactosidase and P-N-acetylglucosaminidase activities, has been obtained from a commercial preparation of Aspergillus niger by a simple isolation procedure involving ammonium sulfate precipitation, pressure dialysis, repeated gel Cltration on Sephadex G-150, and chromatography on diethylaminoethyl Sephadex A-50. The enzyme has a ...
متن کاملGlycosidases of Phaseolus vulgaris
The enzymes, cr-galactosidase, P-galactosidase, a-mannosidase, P-glucosidase, and p-acetylglucosaminidase, have been purified from the germinating seeds of Phaseolus vulgaris. All five enzymes have been simultaneously isolated in a highly active form. The pH optimum, K,,,, and energy of activation of each glycosidase for the reaction of hydrolysis of the appropriate P-nitrophenyl glycoside have...
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ژورنال
عنوان ژورنال: Reproduction
سال: 1974
ISSN: 1470-1626,1741-7899
DOI: 10.1530/jrf.0.0400227