نتایج جستجو برای: exposed to nitrogen vapor and finally moved into liquid nitrogen containers. after freezing
تعداد نتایج: 18601462 فیلتر نتایج به سال:
the aim of the current study was to evaluate the effects of the guanidinoacetic acid (gaa) supplement on the semen freezability of broiler breeder roosters. experiments were performed with twenty ross commercial strain broiler breeder roosters in four treatments and five repeats in a complete randomized design. roosters were fed a diet containing 0% (control), 0.06%, 0.12% and 0.18% gaa supplem...
boron nitride semiconducting zigzag swcnt, $b_{cb}$$n_{cn}$$c_{1-cb-cn}$, as a potential candidate for making nanoelectronic devices was examined. in contrast to the previous dft calculations, wherein just one boron and nitrogen doping configuration have been considered, here for the average over all possible configurations, density of states (dos) was calculated in terms of boron and nitrogen ...
the present study aimed to investigate the possible effects of focused highlighted error feedback on grammatical accuracy of writing among iranian intermediate efl learners. after selecting 52 homogenous participants from among 70 university students attending azad university of rasht and randomly dividing them into two intact groups of 26 students, the researcher exposed the participants of th...
Artificial insemination is a reproductive technology that uses the best male breeders. Successful artificial insemination is affected by several factors, one of the most important and most one is the availability of fertile sperm after the freezing-thawing process. The purpose of this study was to investigate the effect of different concentrations of naringenin after the freezing process. Sp...
Despite the worldwide application of embryo-freezing technology as the means of preserving germplasm of mammalian species, there is no information available on the possible transmission of infectious agents to cryopreserved embryos via contaminated liquid nitrogen (LN). Recently, it has been reported that new methods of cryopreservation which employ ultrarapid freezing or vitrification require ...
Oxidative stress during freezing-thawing reduces motility, viability, membrane functions, antioxidant capacity and finally sperm fertility. Salvia sahendica has antioxidant properties due to phenolic, flavonoids, phenolic acids and phenolic diterpenes compounds. The purpose of this study was to investigate the effect of Salvia sahendica extract as a natural antioxidant on quality of frozen-thaw...
There have been few reports on the preservation of viruses at the temperature of liquid nitrogen (-196 C). In this study, factors affecting the survival of phage were observed. Phage lysates in broth did not lose titer after a storage period of 4 weeks in liquid nitrogen. The rate of freezing was not critical, but freezing in nitrogen vapor was not satisfactory. When the virus was partially pur...
The subject of present work was to predict internal temperature gradients developed during freezing of bovine sperm diluted in extender, packaged in 0.5 ml French plastic straws and suspended in static liquid nitrogen vapor at -100 degree C. For this purpose, a mathematical heat transfer model previously developed to predict freezing times (phase change was considered) of semen/extender package...
nowadays gamete and embryo freezing is an appropriate approach for preserving of genetic traits in laboratory animals, rare and endangered species. frozen cells are suitable replace for actively breeding animals colony. the aim of this study was to perserve laboratory mouse embryo, using vitrification method and comparing effect of two cryoprotectants, glycerol-sucrose(gs) and ethylene glycol-f...
nowadays gamete and embryo freezing is an appropriate approach for preserving of genetic traits in laboratory animals, rare and endangered species. frozen cells are suitable replace for actively breeding animals colony. the aim of this study was to perserve laboratory mouse embryo, using vitrification method and comparing effect of two cryoprotectants, glycerol-sucrose(gs) and ethylene glycol-f...
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