نتایج جستجو برای: sperm type

تعداد نتایج: 1375947  

2001
Bashisth N. Singh Shree Ram Singh

In Drosophila ananassae, female remating with respect to productivity and sperm displacement was studied by employing different mutant strains and a wild type strain. In all the experiments, the continuous confinement technique was used. The comparison of productivity between once-mated (control) and remated females reveals that the productivity of remated females is significantly higher than t...

Journal: :The Journal of experimental biology 2007
Munish V Inamdar Taeyong Kim Yao-Kuang Chung Alex M Was Xinran Xiang Chia-Wei Wang Shuichi Takayama Christian M Lastoskie Florence I M Thomas Ann Marie Sastry

Specific peptides contained within the extracellular layer, or jelly coat, of a sea urchin egg have been hypothesized to play an important role in fertilization, though separate accounting of the effects of chemoattraction, chemokinesis, sperm agglomeration and the other possible roles of the jelly coat have not been reported. In the present study, we used a microfluidic device that allowed det...

Journal: :FASEB journal : official publication of the Federation of American Societies for Experimental Biology 2007
Angshumoy Roy Yi-Nan Lin Julio E Agno Francesco J DeMayo Martin M Matzuk

Sperm flagellar motion is the outcome of a dynamic interplay between the axonemal cytoskeleton, the peri-axonemal accessory structures, and multiple regulatory networks that coordinate to produce flagellar beat and waveform. Tektins are conserved components of the flagellar proteome in evolutionarily diverse species and are believed to play essential roles in the mechanics of sperm motility. Us...

Journal: :Animal reproduction science 2000
L A Johnson

Predetermination of sex in livestock offspring is in great demand and is of critical importance to providing for the most efficient production of the world's food supply. With the changes that have taken place in animal agriculture over the past generation the application of sex preselection to production systems becomes increasingly necessary. The current technology is based on the well-known ...

Journal: :cell journal 0

introduction: transplantation of germ cells restores the male fertility. nevertheless, a lot of questions remain incompletely resolved. the aim of this study was to evaluate in vitro colonization efficiency of germ cells and sperm production capacity of spermatogonial cells before and after culture by sperm number assay in epididymis of recipient mice. materials and methods: we developed a sert...

Journal: :international journal of reproductive biomedicine 0
arzu yavuz oya demirci hamdullah sözen mehmet uludoğan

background: so far, many studies investigated factors that affect pregnancy rates after intrauterine insemination (iui). various investigators have not agreed on the nature and ranking of these criteria. objective: the aim of this study was to assess the predictive factors for pregnancy rate after controlled ovarian hyperstimulation (coh)/ iui. materials and methods: retrospective study of all ...

2013
Kenan Omurtag Amber Cooper Arnold Bullock Cathy Naughton Valerie Ratts Randall Odem Susan E. Lanzendorf

OBJECTIVE Determine whether testicular sperm extractions and pregnancy outcomes are influenced by male and female infertility diagnoses, location of surgical center and time to cryopreservation. PATIENTS One hundred and thirty men undergoing testicular sperm extraction and 76 couples undergoing 123 in vitro fertilization cycles with testicular sperm. OUTCOME MEASURES Successful sperm recove...

2014
P Mui A Perkins P J Burrows S F Marks P J Turek

Vasectomy reversal involves either vasovasostomy (VV) or epididymovasostomy (EV), and rates of epididymal obstruction and EV increase with time after vasectomy. However, as older vasectomies may not require EV for successful reversal, we hypothesized that sperm production falls after vasectomy and can protect the system from epididymal blowout. Our objective was to define how the need for EV at...

Journal: :Annals of nuclear medicine 2005
Hulya Ortapamuk Umit Yener Tekdogan Seniha Naldoken Suleyman Bulut Ali Atan

AIM The aim of this study was to evaluate the hemodynamics of varicocele using Doppler ultrasonography and scrotal scintigraphy, and to compare the value of these two methods in the prediction of seminal improvement after varicocelectomy. MATERIALS AND METHODS A total of 40 men with left sided varicocele presented for surgery because of infertility of at least one year in duration. Preoperati...

2014
Sa Geng Peter De Hoff James G. Umen

Male and female sexes have evolved repeatedly in eukaryotes but the origins of dimorphic sexes and their relationship to mating types in unicellular species are not understood. Volvocine algae include isogamous species such as Chlamydomonas reinhardtii, with two equal-sized mating types, and oogamous multicellular species such as Volvox carteri with sperm-producing males and egg-producing femal...

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