نتایج جستجو برای: exposed to nitrogen vapor and finally moved into liquid nitrogen containers after freezing
تعداد نتایج: 18601462 فیلتر نتایج به سال:
within the components of communicative competence, a special emphasis is put on the “rules of politeness,” specifically the politeness strategies (brown and levinson, 1978) that speakers deploy when performing the request speech act. this is because the degree of imposition that making a request places upon one’s interlocutor(s) has been seen to be influenced by several factors among which, as ...
The Evaluation of the Survival Rate and Motility of Freeze-Thawed Mouse Sperm -Frozen in and out of the Epididym. Saki GH, Hashemitabar M, Ghavvamizadeh B, Safikani Z, Bijannejad D, Sobhani A Corresponding Authoŕ s Address: Department of Anatomy, Tehran,University of Medical Science, Tehran, Iran. Email: [email protected] Background & objectives: Direct contact between a sperm cell and cryopr...
ABSTRACT The development of a cryo-cooling microfluidic device for reducing the resistive noise of a magnetic resonance (MR) microcoil to improve its signal-to-noise ratio (SNR) in MR microscopy applications is presented. The radiofrequency (RF) spiral coil was cryo-cooled to liquid nitrogen temperature (-196oC) by the integrated microfluidic channels carrying liquid nitrogen for decreasing the...
introduction: the objective of this study was to assess developmental potential of mouse morulae, early and laic blastocysts after vitrification in r2 and r2+vero mediums. material and methods: morulae, early and late blastocysts were obtained from superovulated nmri female mice. embryos in experimental group were suspended in a solution of ethylene glycol, ficoll and sucrose (efs40) for 2 minu...
Gary N.Clarke were contaminated during the cryostorage process, probably from the contaminated liquid nitrogen. Thus, there is no doubt Andrology Department, The Royal Women’s Hospital, Carlton, that a range of microbes, including hepatitis B, can survive Victoria 3053, Australia direct exposure to liquid nitrogen, and under certain conditions result in cross-infection. Given the strength of th...
today, the route for economic development in most countries is the same as international open competitive economy. economic institutes well known that supportive public economy belonged on the past and they may compete in the global economy. it is obvious that if they have no competitive potency or not familiar with competition technique, they may be devastated. banking system aims to collect t...
Ferti l i ty of semen frozen in a mechanica~ forced-vapor freezer was compared with that frozen in static nitrogen (N) vapor. Semen from 10 Holstein bulls was extended in milk-10% glycerol at 30 x 106 progressively motile spermatozoa/ml and packaged in .5-ml French straws. Straws were divided into three equal g roups ' bu l l l ' co l l ec t ion day -I and frozen in a mechanical freezer at full...
cement is an essential ingredient in the concrete buildings. for production of cement considerable amount of fossil fuel and electrical energy is consumed. on the other hand for generating one tone of portland cement, nearly one ton of carbon dioxide is released. it shows that 7 percent of the total released carbon dioxide in the world relates to the cement industry. considering ecological issu...
Nitrogen is produced mainly from its most abundant source, the air, using three processes: membrane, pressure swing adsorption (PSA) and cryogenic. The most common method for evaluating a process is using the selection diagrams based on feasibility studies. Since the selection diagrams are presented by different companies, they are biased, and provide unsimilar and even controversial results. I...
Background: Sperm storage via freezing has been useful for men who have difficulty masturbating during assisted reproductive technology (ART) programs and before impotency caused by chemotherapy, vasectomy, and other procedures. Studies were undertaken to evaluate the extent of cryoinjury to both semen and sperm after repeated freezing and thawing in oligozoospermic and normozoospermic samples ...
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