نتایج جستجو برای: freezing thawing cycles
تعداد نتایج: 109142 فیلتر نتایج به سال:
with considerable dispersion in many areas of the world sediments are among the most important sediments in deserted environments. a stabilization method for this type of beds is making use of the setting property of natural pozzolana in the vicinity of lime. these soils have little strength, both in natural humidity as well as in full saturation conditions. their dispersion in many areas of th...
Purpose: Glycerol has been the most widely used cryopreservation agent for spermatozoa and a wide range of factors affects its action on sperm viability and fertilizing capacity. Moreover egg yolk is a common constituent of semen diluents, protects the spermatozoa against cold shock and confers protection during freezing and thawing .The aim of this study was to investigate of different glycero...
The Effects of Concrete Pavement Mix Design Parameters on Durability under Freeze and Thaw Condition
This paper is based on an experimental research that examined the effects of concrete`s major parameters on durability of concrete pavements and curbs under freezing and thawing cycles. These parameters include concrete mix design parameters such as water-cement ratio, fine aggregate percentage and using air entraining admixture and simulating real freeze-thaw cycles that infrastructures underg...
Survival and growth initiation of defrosted Escherichia coli as affected by frozen storage menstrua.
Generally speaking, the literature indicates that the number of bacteria surviving subfreezing temperatures will be functions of: (1) initial numbers of viable cells present when frozen (Record and Taylor, 1953; Kropp, 1950), (2) the rate of the freezing and thawing process (Luyet and Gehenio, 1940), (3) the temperature of storage, with 0 to -20 C being more destructive than the range below -20...
Reactive oxygen species (ROS) generation, induced by the cryopreservation process, can be responsible for mammalian sperm damage. Curcumin is known as an effective antioxidant against oxidative stress. The aim of this study was to evaluate the effects of curcumin on sperm count, motility and viability, semen total antioxidant capacity and DNA integrity of rat spermatozoa during semen freeze-tha...
In this study, a series of pretreatments, including ice-glazing, polyphosphate impregnated, and both ice-glazing were employed to pretreat shucked oysters in order explore the optimal processing conditions for long-time storage. The effect repeated freezing-thawing cycles on quality was evaluated. Several indicators used investigate effects pretreatment. For VBN (volatile salt-based nitrogen) v...
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