نتایج جستجو برای: coated spermatozoa

تعداد نتایج: 61749  

Journal: :Molecular human reproduction 1997
Q X Shi Y Y Yuan E R Roldan

The sperm acrosome reaction takes place in response to progesterone and zona pellucida. Progesterone may act on more than one type of surface receptor, of which one is a gamma-aminobutyric acid (GABA) type A-like receptor. Although there is direct evidence of GABA initiation of mouse sperm acrosome reaction, there are conflicting results regarding GABA-induced exocytosis in human spermatozoa. W...

2017
Daisuke Mashiko Masahito Ikawa Koichi Fujimoto

BACKGROUND Although spermatozoa with normal morphology are assumed to have uniform fertilization ability, recent data show that even normal spermatozoa have considerable variation in their head shape which is associated with differences in fertilization ability. Appropriate quantitative indicators for good sperm morphology, however, remain unidentified. METHODS Therefore, in an effort to iden...

2016
Caroline Flegel Felix Vogel Adrian Hofreuter Sebastian Wojcik Clara Schoeder Katarzyna Kieć-Kononowicz Norbert H. Brockmeyer Christa E. Müller Christian Becker Janine Altmüller Hanns Hatt Günter Gisselmann

G protein-coupled receptors (GPCRs) transduce external chemical cues into intracellular signals and are involved in a plethora of physiological processes, but knowledge regarding the function of these receptors in spermatozoa is limited. In the present study, we performed RNA-Seq and analyzed the expression of the all GPCRs except olfactory receptors in human spermatozoa. We revealed the expres...

2001
W. E. Roudebush E. T. Purnell M. E. Davis

The objective of this study was to examine differences in platelet-activating factor [1-O-alkyl-2acetyl-sn-glycero-3-phosphorylcholine; PAF] in spermatozoa between two lines of Angus beef cattle divergently selected for blood serum insulin-like growth factor I (IGF-I) concentration. Endogenous lipids were extracted from the spermatozoa and endogenous PAF content was determined by radioimmunoass...

Journal: :Theriogenology 1998
T Kawarasaki G R Welch C R Long M Yoshida L A Johnson

Flow cytometric sperm sorting based on X and Y sperm DNA difference has been established as the only effective method for sexing the spermatozoa of mammals. The standard method for verifying the purity of sorted X and Y spermatozoa has been to reanalyze sorted sperm aliquots. We verified the purity of flow-sorted porcine X and Y spermatozoa and accuracy of DNA reanalysis by fluorescence in situ...

Journal: :modares journal of medical sciences: pathobiology 2013
mahsa asgari jahromi mansoureh movahedin masoud amanloo seyed javad mowla zohreh mazaheri

objective: antioxidants are essential for sperm motility. calligonum extract possesses the important antioxidants catechin and quercetin. this study investigates the effects of calligonum extract on sperm parameters and the rate of apoptosis in testes of aging male mice. methods: we initially performed a dose response test with using three doses of calligonum (10 mg/kg, 30 mg/kg and 50 mg/kg). ...

Journal: :avicenna journal of medical biochemistry 0
rohollah setarehbadi student research committee, hamadan university of medical sciences, hamadan, iran mojgan atabakhash student research committee, hamadan university of medical sciences, hamadan, iran amir fattahi student research committee, hamadan university of medical sciences, hamadan, iran aboozar mohagheghi student research committee, hamadan university of medical sciences, hamadan, iran asad vaisi-raygani fertility and infertility center, kermanshah university of medical sciences, kermanshah, iran hossain mahjub department of epidemiology and biostatistics, faculty of public health, hamadan university of medical science, hamadan, iran

objectives lipid components of spermatozoa have an important role in its functional activity. in this study the concentration of cholesterol, phospholipid, triacylglycerol and total lipid in different subsets of human spermatozoa, isolated as three fractions by a discontinuous puresperm gradient, was determined. methods aliquots of the liquefied semen samples (n=107) were layered on top of the ...

2011
Roland Kozdrowski Wojciech Niżański Andrzej Dubiel Wanda Olech

BACKGROUND European bison is the largest mammal in Europe with the population of approximately 4000 individuals. However, there is no report of post-mortem spermatozoa collection and cryopreservation from this species and the aim of this study was to test if the epididymal spermatozoa collected post-mortem from European bison are suitable for cryopreservation and artificial insemination (AI). ...

Journal: :international journal of reproductive biomedicine 0
jalal ghasemzadeh ali reza talebi mohammad ali khalili farzaneh fesahat iman halvaei ali nabi

background: globozoospermia is a severe form of teratozoospermia (incidence < 0.1%) in infertile men that is characterized by round headed sperm and acrosomeless in semen. objective: to compare the semen parameters, protamine deficiency, and apoptosis in ejaculated spermatozoa between globozoospermic and normozoospermic men. materials and methods: thirty six semen samples were divided into two ...

2014
Z. Rečková

REČKOVá, Z., MACHATKOVá, M., RyBář, R., MáCHAL, L.: Monitoring of chromatin integrity changes in the population of motile bovine sperm capacitated in vitro. Acta univ. agric. et silvic. Mendel. Brun., 2007, LV, No. 2, pp. 65–70 The objective of our study was to standardize a method for chromatin integrity assessment in a separated population of bovine sperm and monitor the changes occurring dur...

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