Results 141 to 150 of about 370,507 (192)
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Ultrastructural sperm tail defects associated with sperm immotility
Fertility and Sterility, 1984Four individuals with a complaint of infertility were evaluated after a semen analysis had demonstrated no motility. The semen analyses were otherwise normal, with the exception of a low count in one subject. All had normal percentages of living sperm.
R A, Williamson +3 more
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The Fine Structure of Trematode Sperm-Tails
Transactions of the American Microscopical Society, 1966DESIKACHARY, T. V. 1959. Cyanophyta. (I.C.A.R. Monographs on Algae. 2) Indian Council of Agricultural Research, New Delhi, x-686 pp., end. 139 pls. GRIFFITHS, B. M. 1915. On Glaucocystis nostochinearum Itz., Ann. Bot., 29: 423-432. GEITLER, L. 1923.
B R, Hershenov +2 more
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Fine Structure of Platyhelminth Sperm Tails
Nature, 1967ELECTRON optical studies made during the late fifties led to a general acceptance of the 9 + 2 pattern in the axial filaments of cilia, flagella and sperm tails. In 1961 an exception to the universally accepted pattern was reported in the sperm tail of the trematode Haematoloechus medioplexus1 The tail was found to contain one rather than two fibrils ...
G S, Tulloch, B R, Hershenov
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Speract induces calcium oscillations in the sperm tail [PDF]
Journal of Cell Biology, 2003 Sea urchin sperm motility is modulated by sperm-activating peptides. One such peptide, speract, induces changes in intracellular free calcium concentration ([Ca2+]i). High resolution imaging of single sperm reveals that speract-induced changes in [Ca2+]i have a complex spatiotemporal structure.
Christopher Wood +2 more
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Sperm tail agenesis in a case of consanguinity
Fertility and Sterility, 2004To report a case of 100% teratozoospermia in a patient whose family history presented a high degree of consanguinity.Case report.University-based andrology clinic.A 27-year-old man undergoing infertility evaluation.None.Serum hormone analysis, standard (World Health Organization) semen quality evaluation, sperm ultrastructure, lymphocytic karyotype ...
Maurizio Latini +3 more
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The sperm, a neuron with a tail:‘neuronal’receptors in mammalian sperm
Biological Reviews, 2004ABSTRACTA number of plasma membrane receptor types originally thought to be specific to neurons have been found in other somatic cells. More surprisingly, the mammalian sperm and neuron appear to share many of these‘neuronal’receptors. The morphology, chromosome number, genomic activity, and functions of those two cell types are as unlike as any two ...
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The genetic architecture of morphological abnormalities of the sperm tail
Human Genetics, 2020Spermatozoa contain highly specialized structural features reflecting unique functions required for fertilization. Among them, the flagellum is a sperm-specific organelle required to generate the motility, which is essential to reach the egg. The flagellum integrity is, therefore, critical for normal sperm function and flagellum defects consistently ...
Touré, Aminata +7 more
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Pregnancy from intracytoplasmic sperm injection of a sperm head and detached tail
Fertility and Sterility, 2004To evaluate sperm ultrastructure and the efficacy of intracytoplasmic sperm injection (ICSI) with careful positioning of the sperm midpiece next to the sperm head in a patient with easily decapitated sperm syndrome.In vitro fertilization case report with retrospective sperm ultrastructure analysis.In vitro fertilization clinic and andrology laboratory ...
Benjamin R, Emery +3 more
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Fine structure of the snake sperm tail
Journal of Ultrastructure Research, 1965The spermatozoa of six varieties of snake (Lampropeltis getulus, Coluber constrictor, Drymarchon corais, Crotalus adamanteus, Micrurus fulvius, and Constrictor spp.), examined in the fresh state by phase-contrast microscopy, appeared identical. Each spermatozoon had an elongated conical head, a short thick neck, and a mitochondrial coat covering two ...
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Computerized semen analysis with sperm tail detection
Human Reproduction, 1990We evaluated a recently developed computerized semen analyser that detects spermatozoa not only by the criteria of size, contrast and movement but also by the morphological characteristics of the sperm tail. Comparison of the sperm concentration in 33 semen samples measured by conventional and by computerized semen analysis, as well as by flow ...
J, Neuwinger, H M, Behre, E, Nieschlag
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