نتایج جستجو برای: sperm coating

تعداد نتایج: 73758  

2016
Ningning Li Minzhi Wang Gong Zheng Yongsheng Li Guang Chen Hugo F. Lopez

An Ni2Al3 coating was prepared via the electrodeposition of nickel followed by pack aluminization. Polarization curve and electrochemical impedance spectroscopy were performed to study the room temperature corrosion behavior of the coating in a 3.5 wt. % NaCl solution. The long-term impedance of the coating was also investigated after immersion for 30 days. Results show that the Ni2Al3 coating ...

2014
Vikram M. Pandya

Until about 1950, sugar coating was the first choice as coating agent for pharmaceutical preparation and much time & efforts were spent in perfecting the sugar coating techniques. Nobody ever was concerned about the problems like material cost, toxic effect due to coating or pollution etc. because the solvent used was always water. However, sugar coating technique was time consuming, affecting ...

Journal: :Poultry science 2006
P R Dumpala H M Parker C D McDaniel

The sperm quality index (SQI) and sperm mobility index (SMI) both predict sperm motility. Previous research was conducted comparing the SMI with the SQI; however, semen was diluted improperly for the SQI (40-fold). For an accurate comparison, semen must be diluted 10-fold for the SQI. Therefore, the overall objective of this study, utilizing 4 experiments, was to examine the relationship of the...

Journal: :General and comparative endocrinology 2016
Marc Suquet Clémence Gourtay Anne Donval Nelly Le Goïc Claudie Quere Florent Malo Jaqueline Le Grand Dominique Ratiskol Christian Mingant Christian Fauvel

Most publications devoted to the cryopreservation of mollusc sperm have focused on the definition of technical protocols, avoiding the description of sperm quality after thawing. The present study investigated the effects of cryopreservation on sperm quality in the great scallop. Wild scallop were fished during the natural spawning period and conditioned in the hatchery before use. Sperm sample...

2016
Torvald B. Egeland Geir Rudolfsen Jarle T. Nordeide Ivar Folstad

Why dominant males experiencing intense sperm competition sometimes show low investments in sperm production is not always obvious. One well-documented example is that of the external fertilizing teleost, the Arctic charr (Salvelinus alpinus), where individuals becoming dominant reduce sperm production and sperm swimming speed in water compared to subordinates. Here, we report how ovarian fluid...

2015
Clair Bennison Nicola Hemmings Jon Slate Tim Birkhead

Sperm competition, in which the ejaculates of multiple males compete to fertilize a female's ova, results in strong selection on sperm traits. Although sperm size and swimming velocity are known to independently affect fertilization success in certain species, exploring the relationship between sperm length, swimming velocity and fertilization success still remains a challenge. Here, we use the...

Journal: :Human reproduction 2005
Soichi Nakamura Yukihiro Terada Vanesa Y Rawe Shigeki Uehara Yuki Morito Tomoko Yoshimoto Masahito Tachibana Takashi Murakami Nobuo Yaegashi Kunihiro Okamura

BACKGROUND In human fertilization, sperm centrosome function is essential for male and female pronuclear movement and fusion. In this study, we investigated the possibility of restoring human sperm centrosomal function in sperm exhibiting abnormalities in microtubule organization. METHODS Semen was obtained from both a fertile donor and a patient with dysplasia of the fibrous sheath (DFS). Fo...

Journal: :Proceedings. Biological sciences 2013
Lisa Locatello Federica Poli Maria B Rasotto

Seminal fluid often makes up a large part of an ejaculate, yet most empirical and theoretical studies on sperm competition have focused on how sperm characteristics (number and quality) affect fertilization success. However, seminal fluid influences own sperm performance and may potentially influence the outcome of sperm competition, by also affecting that of rivals. As a consequence males may ...

Journal: :The Journal of veterinary medical science 2012
Mari Toyonaga Toshihiko Tsutsui

It is thought that differences in conception rate between feline epididymal sperm and ejaculate sperm occur because, unlike ejaculated sperm, caudal epididymal sperm have not been sensitized with seminal plasma (SP). In this study, we investigated whether collection of feline epididymal sperm with SP influences sperm qualities after freezing-thawing. Sperm were sensitized with SP for 10 min at ...

2013
Guixiang Ji Lifeng Yan Shengmin Wu Jining Liu Lei Wang Shenghu Zhang Lili Shi Aihua Gu

BACKGROUND DNA adducts are widely used marker of DNA damage induced by environmental pollutants. The present study was designed to explore whether sperm polycyclic aromatic hydrocarbon-DNA adducts were associated with sperm DNA integrity and semen quality. METHODS A total of 433 Han Chinese men were recruited from an infertility clinic. Immunofluorescence was applied to analyze sperm PAH-DNA ...

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