نتایج جستجو برای: motility characteristics
تعداد نتایج: 696862 فیلتر نتایج به سال:
We show that gyrotactic motility within a steady vortical flow leads to tightly clustered aggregations of microorganisms. Two dimensionless numbers, characterizing the relative swimming speed and stability against overturning by vorticity, govern the coupling between motility and flow. Exploration of parameter space reveals a striking array of patchiness regimes. Aggregations are found to form ...
introduction: sperm cryopreservation is widely used as a way of preserving the male sperm used in future artificial insemination and fertilization. despite all the recent advances in cryopreservation technology, sperm motility is negatively affected by freezing and the thawing afterwards. yet hyaluronic acid is believed to improve the vitality and motility of the sperm, enhancing the physiologi...
ABSTRACT Background and Objective: Several studies have shown the antimicrobial activity of lactobacilli against Salmonella enterica (serotype typhimurium). The aim of this study was to evaluate the inhibitory potential of metabolites produced by probiotic culture of Lactobacillus casei against S. typhimurium and its impact on S. ty...
Background: Pentoxifylline (PX) is a methyxanthin derivative that influences the sperm motion characteristics. In general, PX has been reportedly effective in preserving sperm motility in vitro, also when administered orally to the asthenozoospermic patients. Objective: The main objective of this prospective clinical trial study was to rule out the effect of oral administration of PX on sperm p...
Background Fertility disorder is a multifaceted physiopathological condition comprising men’s or women’s impotence in fertility or a combination of both. Men’s debility in fertilization is the main culprit in 40-50 percent of the studied cases. The first step in scrutinizing infertility is to analyze semen. So, the assessment hinges on analyzing factors like sperm density, total count and motil...
In order to improve Boer goat semen quality during cryopreservation process, the influence of sugar supplementation on semen characteristics of sperm were investigated. Three experiments were carried out to investigate the effect of (a) addition of two monosaccharides (fructose and glucose) and two disaccharides sugars (trehalose and sucrose) (b) sugar combination (fructose and trehalose, sucro...
sperm selection techniques have became an important tool to improve sub fertile ejaculates. the main aim of this study was to assess the dynamics of motile sperm subpopulations of ejaculates from subfertile stallions subjected to density gradient centrifugation (dgc) involving a double layer colloid [dgc2], before and after storage for 24 and 48 hours. ejaculates from eight stallions with ferti...
Background and aim: given the high prevalence of bacterial infections, particularly the E.coli in the semen of infertile men compared to fertile men and according to the controversial reports on the association of E.coli with male infertility, herein, the prevalence of this bacterium in the semen of infertile men and its possible association with parameters determining sperm fertility was evalu...
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