Results 281 to 290 of about 66,364 (295)
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Nature, 1962
THE interpretation of the structure of the spermatozoa of cestodes and of the process of spermatogenesis is subject to wide divergence of opinion. In 1935 Young1 directed attention to the lack of knowledge regarding cestode structure and development, and among the main problems awaiting solution discussed the method of cell division and the structure ...
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THE interpretation of the structure of the spermatozoa of cestodes and of the process of spermatogenesis is subject to wide divergence of opinion. In 1935 Young1 directed attention to the lack of knowledge regarding cestode structure and development, and among the main problems awaiting solution discussed the method of cell division and the structure ...
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Microscopy Research and Technique, 1995
AbstractSpermatogenesis is a process of division and differentiation by which spermatozoa are produced in seminiferous tubules. A measure of efficiency of spermatogenesis is the estimated number of spermatozoa produced per day per gram of testicular parenchyma.
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AbstractSpermatogenesis is a process of division and differentiation by which spermatozoa are produced in seminiferous tubules. A measure of efficiency of spermatogenesis is the estimated number of spermatozoa produced per day per gram of testicular parenchyma.
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1974
The effect upon spermatogenesis of subdermal silastic capsules containing testosterone in combination with various oral drugs was studied in groups of subfertile men. Group 1 received 25 mg norethisterone daily by mouth in conjunction with 6 norethindrone implants and 3 testosterone implants.
Bartsch G, Frick J
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The effect upon spermatogenesis of subdermal silastic capsules containing testosterone in combination with various oral drugs was studied in groups of subfertile men. Group 1 received 25 mg norethisterone daily by mouth in conjunction with 6 norethindrone implants and 3 testosterone implants.
Bartsch G, Frick J
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2009
For many years androgens were thought to be the primary hormones required for proper functioning of the male reproductive system, and testes were shown to be the major producers of the hormone. In the 1970s it was recognized that in addition to androgens testes were also a source of estrogens, and the intratesticular concentration of estrogens was ...
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For many years androgens were thought to be the primary hormones required for proper functioning of the male reproductive system, and testes were shown to be the major producers of the hormone. In the 1970s it was recognized that in addition to androgens testes were also a source of estrogens, and the intratesticular concentration of estrogens was ...
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Spermatogenesis in Cryptorchidism
2011Cryptorchidism or undescended testis is the most frequent congenital abnormality in newborn boys. The process of testicular descent to the scrotum is controlled by hormones produced in Leydig cells, insulin-like3, and androgens. Variation in genetic and environmental factors might affect testicular descent.
Zaohua Huang +2 more
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1987
Spermatogenesis is an intensively studied developmental process in Drosophila melanogaster and Drosophila hydei. Nonetheless, some phases of the development of the germ cells are still hardly understood. The main gap of information is with respect to the germ line-soma differentiation and the formation of the gonad.
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Spermatogenesis is an intensively studied developmental process in Drosophila melanogaster and Drosophila hydei. Nonetheless, some phases of the development of the germ cells are still hardly understood. The main gap of information is with respect to the germ line-soma differentiation and the formation of the gonad.
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The intent of this chapter is to provide a morphological foundation in the normal cellular process of bovine gamete development so that abnormalities occurring are recognizable. The knowledge gained here is essential to begin to understand the significance of many of the common bull sperm abnormalities encountered in the clinics.
Albert, Barth +4 more
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Albert, Barth +4 more
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