Heat-Shock Resistance

Heat-Shock Resistance

 

the ability of refractory and other brittle materials to withstand thermal loads caused by changes in temperature upon heating or cooling. Heat-shock resistance depends on the material’s coefficients of thermal expansion and thermal conduction, elasticity, and other properties and on the shape and size of the article; formulas for calculating the coefficients and criteria of heat-shock resistance are based on these relations. In practice, heat-shock resistance is usually determined by the number of thermal cyclings (heating and cooling cycles) that a sample can withstand before cracks appear or before the sample is partially or totally destroyed. It can also be determined by the temperature gradient that causes cracking.

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MCC improves the body, texture, extrusion qualities and heat-shock resistance in frozen desserts.
Quintana and Prevosti (1990a) suggested that heat-shock resistance was associated with adult longevity, which also was enhanced after development under crowded conditions.
based on an analysis of several Drosophila species, Levins (1969) reported higher heat-shock resistance in larger flies compared to smaller ones reared at the same density.
In the present work, we revealed no direct association between knockdown resistance and heat-shock resistance estimated as the proportion of flies that survived after exposure to a potentially lethal temperature.
Selection for heat-shock resistance in larval and in adult Drosophila buzzatii: comparing direct and indirect responses.
Here we provide results for selection on heat-shock resistance in the cactophilic Drosophila, Drosophila buzzatii, which inhabits necrotic cladodes of Opuntia cactus, generally in hot and sun-exposed environments (Barker and Mulley 1976), with temperatures in the cladodes at noon commonly exceeding 37 [degrees] C (Krebs and Loeschcke 1994).
After 17 generations of selection on heat-pretreated individuals [ILLUSTRATION FOR FIGURE 1 OMITTED], heat-shock resistance was significantly higher in selected lines than in control lines, which received pretreatment each selection generation but were not otherwise exposed to stress (selection effect, [F.
Differences in larval heat-shock resistance among selection and control lines were examined twice in the adult selection lines [ILLUSTRATION FOR FIGURE 2 OMITTED].