نتایج جستجو برای: sperm physiology

تعداد نتایج: 124501  

Journal: :Asian journal of andrology 2011
Fabrice Saez Aurélia Ouvrier Joël R Drevet

Cholesterol, being the starting point of steroid hormone synthesis, is a long known modulator of both female and male reproductive physiology especially at the level of the gonads and the impact cholesterol has on gametogenesis. Less is known about the effects cholesterol homeostasis may have on postgonadic reproductive functions. Lately, several data have been reported showing how imbalanced c...

حسنین, پریسا, صادقی پور رودسری, حمیدرضا ,

1,4dihydro 2,6dimethyl 4 4.nitrophenyl)  , 5pyridinedicarboxylic acid dimethyl ester (DDNPD), is a new analogus of nifedipine that has no effect on calcium channels of cardiovascular system. Because nifedipine can reduce fertility in males( through effect on calcium channels on sperm membrane and inhibition of acrosomal reaction), this study&nbs...

2017
Naseer A. Kutchy Ana Velho Erika S. B. Menezes Marie Jacobsen Giselle Thibaudeau Robert W. Wills Arlindo Moura Abdullah Kaya Andy Perkins Erdogan Memili

BACKGROUND Bull fertility is the degree of sperm's ability to fertilize and activate the egg and support embryo development, and this is critical for herd reproductive performance. We used the bull as a unique model organism for the study of male fertility because cattle genetics and physiology is similar to those of other mammals including humans. Moreover, reliable fertility data along with w...

2012
Gulab Chandra A. Aggarwal A. Singh A. K. Singh M. Kumar R. Kushwaha Y. K. Singh

Dairy Cattle Physiology Division, National Dairy Research Institute, Karnal 132 001, India Received: 30-07-2011 Accepted: 18-08-2011 ABSTRACT Oxidative stress occurs when the production of potentially destructive reactive oxygen species (ROS) exceeds the bodies own natural antioxidant defenses, resulting in cellular damage. ROS, defined as including oxygen ions, free radicals and peroxides, are...

Journal: :Biology of reproduction 1998
T T Smith

During their sojourn in the female tract, sperm come into contact with the epithelial cells that line the tract and their secretions. In the past, much attention has been given to the nature and composition of uterine and oviductal fluid [1-3] with the aim of understanding what components of these fluids may affect the events associated with fertilization and preimplantation embryo development....

Background Leukocytes linked directly and indirectly to reactive oxygen species (ROS) formation. Although leukocytospermia is defined as the presence of ≥1×106 white blood cells/mL (WBC/mL) in a semen sample, the presence of less than 1×106 WBC/mL (low-level leukocytospermia) still can produce a detectable amount of ROS, impairing sperm function and lowering the chances of pregnancy. Low concen...

2012
Pinki Nandi Swatilekha Ghosh Kuladip Jana Parimal C. Sen

Mammalian sperm capacitation is an essential prerequisite to fertilization. Although progress is being made in understanding the physiology and biochemistry of capacitation, little has been yet explored about the potential role(s) of individual sperm cell protein during this process. Therefore elucidation of the role of different sperm proteins in the process of capacitation might be of great i...

Journal: :Wiley interdisciplinary reviews. Systems biology and medicine 2011
Linda Z Shi Jaclyn Nascimento Elliot Botvinick Barbara Durrant Michael W Berns

Optical trapping is a noninvasive biophotonic tool that has been developed to study the physiological and biomechanical properties of cells. The custom-designed optical system is built to direct near-infrared laser light into an inverted microscope to create a single-point three-dimensional gradient laser trap at the microscope focal point. A real-time automated tracking and trapping system (RA...

2010
J. P. Brillard

The mammalian oviduct has long been recognized as an organ essential to the success of reproduction. Bovine, ovine, porcine and equine animal models have offered clear advantages for oviduct study related to gamete physiology, fertilization and early embryo development. Livestock species are amenable to surgical alteration of the reproductive tract, estrous cycle manipulation, gamete cryopreser...

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