Results 261 to 270 of about 66,025 (308)

Sperm motility in the presence of boundaries

Bulletin of Mathematical Biology, 1995
The fluid dynamics of sperm motility near both rigid and elastic walls is studied using the immersed boundary method. Simulations of both single and interacting organisms are presented. In particular, we find that nearby organisms originally undulating with a 90 degree phase shift may adjust their relative swimming velocities and phase-lock ...
Fauci, Lisa J., McDonald, Amy
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Caffeine and sperm motility

Fertility and Sterility, 1983
Six different doses of caffeine were used to study its effect on human spermatozoal motility. The recently developed method for assessment of sperm motility by videomicrography was used to determine the percentage of sperm motility, swimming speed (velocity), percentage of progressive sperm, and progressive swimming speed.
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Hyperactivated Motility in Sperm

Journal of Andrology, 1996
The functions of hyperactivation may fit together to create the following scenario. Sperm that enter the oviduct bind to the mucosal epithelium. Near the time of ovulation, hyperactivation helps them to detach from the epithelium, escape mucosal pockets, and move through oviductal mucus.
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Sperm Motility, Velocity and Migration

British Journal of Urology, 1990
Summary— Four different methods for evaluating sperm motility were analysed for experimental error: subjective assessment of a wet film preparation, sperm velocity measured by time‐lapse photography, sperm velocity measured by computer analysis and sperm migration across a nucleopore membrane.
D F, Badenoch, H D, Moore, W V, Holt, P R, Evans, B S, Sidhu, S J, Evans   +5 more
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The influence of prostaglandins on sperm motility

Prostaglandins, 1981
Prostaglandin E2 and F2 alpha were measured in ejaculates from 10 fertile and 55 infertile men. Prostaglandin F2 alpha was negatively correlated with motility (r = 0.77; p less than 0.01) in normal men. In patients with disturbed fertility, prostaglandin F2 alpha was always higher than in the controls, while prostaglandin E2 was elevated only in ...
W, Schlegel, S, Rotermund, G, Färber, E, Nieschlag   +3 more
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Urogenital infection and sperm motility

Andrologia, 2003
Male accessory sex gland infections are considered as potential hazards to male fertility. Various pathophysiological concepts have evolved from experimental and clinical studies that begin to explain the effects of bacteria and immunological events on the function of spermatozoa and sperm motility in particular. Besides direct influences of pathogenic
T, Diemer, P, Huwe, M, Ludwig, E W, Hauck, W, Weidner   +4 more
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Robotic Immobilization of Motile Sperm

2018 IEEE International Conference on Robotics and Automation (ICRA), 2018
Manipulation of motile cells such as bacteria and sperm is required in both cell biology and clinical applications. For immobilizing a motile sperm, the sperm head and tail positions must be accurately tracked, interference of proximal sperms on the target sperm must be tackled, and the orientation of the sperm must be properly aligned with the ...
Zhuoran Zhang 0001, Changsheng Dai, James Huang 0002, Xian Wang 0001, Jun Liu 0007, Junyan Zhang, Sergey Moskovtsev, Clifford Librach, Keith Jarvi, Yu Sun 0001   +9 more
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Metabolism of motile zebrafish sperm

Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology, 2011
As metabolism of motile fish sperm is not well understood, the current study examined the metabolism of saline-activated zebrafish (Danio rerio) sperm. Activation of sperm with inhibitors of oxidative phosphorylation (potassium cyanide, 2,4 dinitrophenol or carbonyl cyanide 3-cholorophenylhydrazone) negatively impacted sperm motility by 60-90 s ...
R L, Ingermann, C L F, Schultz, M K, Kanuga, J G, Wilson-Leedy   +3 more
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Pharmacological stimulation of sperm motility

Human Reproduction, 1994
The treatment of male factor infertility is a rapidly developing field. The introduction of microsurgical fertilization techniques allows assisted conception units to treat couples who previously would not have benefited from in-vitro fertilization techniques.
F, Lanzafame, M G, Chapman, A, Guglielmino, C M, Gearon, R G, Forman   +4 more
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Sperm Motility in the Rat Epididymis

Fertility and Sterility, 1974
The development of sperm motility was studied in rats with ligated caput epididymidis to determine whether intrinsic or extrinsic factors were involved. Most sperm moved in circular patterns; sperm from the ligated caput showed more motility after 7 to 10 days retention but none showed motion of the mature progressive type.
M H, Burgos, E S, Tovar
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