نتایج جستجو برای: freezing and thawing test
تعداد نتایج: 16905427 فیلتر نتایج به سال:
AIMS Clostridium difficile is a common nosocomial pathogen and as such diagnostic and research methods may necessitate storage of faecal specimens for long periods, followed by subsequent re-examination. This study investigated the effects of storage conditions upon the viability of this organism and its toxin. METHODS Three genotypically distinct strains of C difficile (two clinical isolates...
Abstract Background: Oxidative damage to sperm resulting from reactive oxygen radicals and lipid peroxidation generated by the cellular components of semen during sperm freezing is possibly one of the main causes of the decline in motility during storage. The aim of this study was to evaluate the antioxidant effect of melatonin in different doses on oxidative stress and motility of cryo-pre...
Free settling tests, small angle light scattering (SALS), microtome-slicing techniques, and confocal laser scanning microscopy (CLSM) were performed to examine how the cationic flocculation or freezing and thawing affected the floc structure. The floc size, internal pore size, mass fractal dimensions determined from free-settling test or small angle light scattering test, aeral porosity, bounda...
Soil freezing characteristic curve (SFCC) defines the relationship between unfrozen water content and subzero temperature. The SFCC is widely applied to estimate soil properties. current study explored effects of initial content, dry density, type desalination on during a freezing-thawing process. It showed that had great impacts SFCC, while density an insignificant effect SFCC. Hysteresis beha...
In total, 215 commercially processed broiler carcasses were examined to determine optimum cultural enumeration, the effects of freezing, method of thawing, and duration of frozen storage on levels of Campylobacter spp. and fecal coliforms. Enumeration studies compared MPN procedures to direct plating onto selective mCCDA agar and indicated equivalency for quantitation of Campylobacter spp. Leve...
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