منابع مشابه
Study of Bull Spermatozoa
The electron microscope has been used to determine the characteristic dimensions and the distribution of the dry mass in bull spermatozoa. The most important result is that all characteristic data are occurring in logarithmic distributions. Furthermore, no correlation between such parameters as head weight and tail weight or head length and tail length was found. The occurrence in logarithmic d...
متن کاملThe Morphology of Bull Spermatozoa
It has been known since the nineteenth century that the microscopical structure of living cells may be modified by fixation and by post-mortem or sub-mortem changes (Hardy, 1899), but inadequate attention seems to have been paid to factors which may injure spermatozoa before fixation and microscopical examination. One such factor is the effect of sudden cooling. If semen is exposed to a sudden ...
متن کاملThe metabolism of pyruvate in bull spermatozoa.
1. Sugars present in nectar secreted by twelve species were separated on paper chromatograms, and quantitative determinations of the amounts of glucose and fructose were made. The total sugar content of each sample was measured with a refractometer. 2. The proportions of glucose and fructose varied greatly in nectar from different species. 3. For any one species, the proportions of the differen...
متن کاملDynamics of microRNAs in bull spermatozoa
BACKGROUND MicroRNAs are small non-coding RNAs that regulate gene expression and thus play important roles in mammalian development. However, the comprehensive lists of microRNAs, as well as, molecular mechanisms by which microRNAs regulate gene expression during gamete and embryo development are poorly defined. The objectives of this study were to determine microRNAs in bull sperm and predict ...
متن کاملAnaero bic heat production of bull spermatozoa.
A micro-calorimeter, suitable for detecting rates of heat production of the order of 1 mcal/h in about 2*3 ml. fluid, is described. Measurements have been made with it of the anaerobic heat production of bull spermatozoa in semen. The result, for the first hour, 220+ 15 mcal/109 live spermatozoa/h at 37° C, is consistent with the hypothesis that, in the first hour of incubation, the heat produc...
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ژورنال
عنوان ژورنال: Journal of Cell Biology
سال: 1964
ISSN: 1540-8140,0021-9525
DOI: 10.1083/jcb.21.2.175