Results 221 to 230 of about 67,099 (264)
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Cytogenetic and Genome Research, 1964
An improved technique for the preparation of meiotic chromosomes from human testicular biopsy specimens for microscopic examination is described. The results are exemplified by a description of the observations of the chromosomes at various stages of the first and second meiotic divisions in a normal male.
J.A. Böök, B. Kjessler
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An improved technique for the preparation of meiotic chromosomes from human testicular biopsy specimens for microscopic examination is described. The results are exemplified by a description of the observations of the chromosomes at various stages of the first and second meiotic divisions in a normal male.
J.A. Böök, B. Kjessler
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The novel male meiosis recombination regulator coordinates the progression of meiosis prophase I
Journal of Genetics and Genomics, 2020 Meiosis is a specialized cell division for producing haploid gametes in sexually reproducing organisms. In this study, we have independently identified a novel meiosis protein male meiosis recombination regulator (MAMERR)/4930432K21Rik and showed that it is indispensable for meiosis prophase I progression in male mice. Using super-resolution structured
Miao Li, P Jeremy Wang, Kui Liu
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Meiosis and spermatogenesis in G-Trisomic males
Humangenetik, 1971In 3 adult males with trisomy-G, Down's syndrome, the chromosomes were studied in spermatogonial mitoses and in the first meiotic division. The findings were similar in all cases and are here presented together. Of 8 spermatogonial mitoses of good quality, 4 had 46 chromosomes and 4 had 47 chromosomes.
J, Schröder +2 more
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Meiosis in a male with Down's syndrome
Chromosoma, 1965The chromosomes in mitotic and meiotic phases were investigated in a male Down's syndrome case, aged 45. Information was obtained that based on blood and tunica vaginalis cultures, the somatic chromosome complement was found to possess 47 chromosomes with the standard 21-trisomy, and further that the majority of cells from biopsied testicular specimens
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Meiosis in the male mouse. An autoradiographic investigation
Chromosoma, 1970Meiosis in the male mouse has been studied autoradiographically in air-dried preparations. Information has been obtained on the relative rates of DNA synthesis and the lengths of the S-periods in spermatogonia and spermatocytes. The average rate of synthesis in the spermatocyte is lower, and the S-period is of longer duration than the preceding ...
S, Kofman-Alfaro, A C, Chandley
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Endocrine Correlates of Meiosis in the Male Rat
Archives of Andrology, 1979Changes in the proportion of cells within various DNA classes of dispersed testicular cells from the developing rat were monitored by microflow fluorometry and correlated with changes in the function of the pituitary (FSH), of the Leydig cells (androgens) and Sertoli cells (androgen-binding proteins, ABP).
O P, Clausen, K, Purvis, V, Hansson
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Retinoic acid regulation of male meiosis
Current Opinion in Endocrinology, Diabetes & Obesity, 2013Description of new evidence to support the model for how retinoic acid regulates spermatogonial differentiation, male meiosis and the cycle of the seminiferous epithelium.It has been known since the 1920s that vitamin A is essential for spermatogenesis.
Cathryn A, Hogarth, Michael D, Griswold
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1965
In the species of the genus Chorthippus, as in a majority of the genera in the sub-family Truxalinae, the mitotic chromosome complement of the male includes seventeen members. Sixteen of these are autosomes and can be matched into eight homologous pairs; the seventeenth chromosome is unpaired and represents a sex or X-chromosome. All these elements are
Bernard John, Kenneth R. Lewis
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In the species of the genus Chorthippus, as in a majority of the genera in the sub-family Truxalinae, the mitotic chromosome complement of the male includes seventeen members. Sixteen of these are autosomes and can be matched into eight homologous pairs; the seventeenth chromosome is unpaired and represents a sex or X-chromosome. All these elements are
Bernard John, Kenneth R. Lewis
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Cytogenetic Aspects of Human Male Meiosis
1973During the first half of the present century human meiotic chromosomes were studied mainly in order to obtain information on the chromosome number of man. Different authors came to different conclusions regarding this number due to the fact that the only technique available for such studies was the use of histological sections from fixed testicular ...
M, Hultén, J, Lindsten
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