Cryotolerance
Mostrando 1-8 de 8 artigos, teses e dissertações.
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1. Bovine in vitro embryo production protocol: does it really influence embryo cryotolerance?
Publicado em: 2010
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2. Efeito da fonte protéicas durante o cultivo na qualidade e quantidade de embriões bovinos produzidos in vitro
The embryo IVP success is related to the knowledge of main requirements from gametes and embryos in different stages of development. It is well known that IVP embryos are quite different of those counterparts in vivo in many aspects. Dissimilarity between both has been studied in tempting to turn artificially mediums mostly similar to embryo natural environm
Publicado em: 2008
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3. Effect of Growth Conditions and Trehalose Content on Cryotolerance of Bakers' Yeast in Frozen Doughs
The cryotolerance in frozen doughs and in water suspensions of bakers' yeast (Saccharomyces cerevisiae) previously grown under various industrial conditions was evaluated on a laboratory scale. Fed-batch cultures were very superior to batch cultures, and strong aeration enhanced cryoresistance in both cases for freezing rates of 1 to 56°C min−1. Loss of c
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4. Lipid Content and Cryotolerance of Bakers' Yeast in Frozen Doughs †
The relationship between lipid content and tolerance to freezing at −50°C was studied in Saccharomyces cerevisiae grown under batch or fed-batch mode and various aeration and temperature conditions. A higher free-sterol-to-phospholipid ratio as well as higher free sterol and phospholipid contents correlated with the superior cryoresistance in dough or in
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5. Glycine betaine confers enhanced osmotolerance and cryotolerance on Listeria monocytogenes.
Listeria monocytogenes is a gram-positive food-borne pathogen that is notably resistant to osmotic stress and can grow at refrigerator temperatures. These two characteristics make it an insidious threat to public health. Like several other organisms, L. monocytogenes accumulates glycine betaine, a ubiquitous and effective osmolyte, intracellularly when grown
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6. Identification and Disruption of BetL, a Secondary Glycine Betaine Transport System Linked to the Salt Tolerance of Listeria monocytogenes LO28
The trimethylammonium compound glycine betaine (N,N,N-trimethylglycine) can be accumulated to high intracellular concentrations, conferring enhanced osmo- and cryotolerance upon Listeria monocytogenes. We report the identification of betL, a gene encoding a glycine betaine uptake system in L. monocytogenes, isolated by functional complementation of the betai
American Society for Microbiology.
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7. Role of growth phase and ethanol in freeze-thaw stress resistance of Saccharomyces cerevisiae.
The freeze-thaw tolerance of Saccharomyces cerevisiae was examined throughout growth in aerobic batch culture. Minimum tolerance to rapid freezing (immersion in liquid nitrogen; cooling rate, approximately 200 degrees C min-1) was associated with respirofermentative (exponential) growth on glucose. However, maximum tolerance occurred not during the stationar
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8. Role of the Glycine Betaine and Carnitine Transporters in Adaptation of Listeria monocytogenes to Chill Stress in Defined Medium
The food-borne pathogen Listeria monocytogenes proliferates at refrigeration temperatures, rendering refrigeration ineffective in the preservation of Listeria-contaminated foods. The uptake and intracellular accumulation of the potent compatible solutes glycine betaine and carnitine has been shown to be a key mediator of the pathogen's cold-tolerant phenotyp
American Society for Microbiology.