The variations of muscle tissus, peroxidase and Ca2+-ATPase activities and Vp （pasteurization value） were investigated with the fresh samples of grass carp （Ctenopharyngodon idellus） heated at different temperatur...The variations of muscle tissus, peroxidase and Ca2+-ATPase activities and Vp （pasteurization value） were investigated with the fresh samples of grass carp （Ctenopharyngodon idellus） heated at different temperatures, thus revealing the mechanism of denaturation of muscle protein by heating. The experimental results showed the great difference in muscle tissue structure before and after the samples heated. In the initial stage of heating the water loss accounted for 50% of the total. When the samples were separately heated at 75, 85, and 95℃, fh values （dehydration curve slope） were 5, 4.1 and 1.7, respectively, while Vp reaching 40 minutes were 22, 8 and 5 min, respectively. As to the time for deactivation of peroxidase in the heated samples at the various temperatures, it varied from 38, 10 and to less than 6 min, respectively and the deactivation rates of Ca2+-ATPase in 1 min were 50%, 88% and 100%, respectively. Consequently, the higher temperature the sample was heated, the faster rate of thermocon ductivity, the lower rate of water loss, and the faster rate of peroxidase deactivation it was. Also, the Vp for the least requirement of pasteurization （Vp≥40min） was obtained.展开更多
在高温高压实验条件下,对岩石超声脉冲传输测速的研究,在国内外已经做了很多工作,资料甚丰。目前,Kern H(1982)和Lebedev E B(1990)等的实验温度达到了700℃和800℃,Mueller H J等(1988)已达到了1000℃,但总的数据不多。笔者改进了实验...在高温高压实验条件下,对岩石超声脉冲传输测速的研究,在国内外已经做了很多工作,资料甚丰。目前,Kern H(1982)和Lebedev E B(1990)等的实验温度达到了700℃和800℃,Mueller H J等(1988)已达到了1000℃,但总的数据不多。笔者改进了实验方法,实验温度达800℃以上,最高达到1040℃,模拟壳幔的温度条件更接近实际,通过实验作者获得了一批具有新的特征的波速数据,对中。展开更多
文摘The variations of muscle tissus, peroxidase and Ca2+-ATPase activities and Vp （pasteurization value） were investigated with the fresh samples of grass carp （Ctenopharyngodon idellus） heated at different temperatures, thus revealing the mechanism of denaturation of muscle protein by heating. The experimental results showed the great difference in muscle tissue structure before and after the samples heated. In the initial stage of heating the water loss accounted for 50% of the total. When the samples were separately heated at 75, 85, and 95℃, fh values （dehydration curve slope） were 5, 4.1 and 1.7, respectively, while Vp reaching 40 minutes were 22, 8 and 5 min, respectively. As to the time for deactivation of peroxidase in the heated samples at the various temperatures, it varied from 38, 10 and to less than 6 min, respectively and the deactivation rates of Ca2+-ATPase in 1 min were 50%, 88% and 100%, respectively. Consequently, the higher temperature the sample was heated, the faster rate of thermocon ductivity, the lower rate of water loss, and the faster rate of peroxidase deactivation it was. Also, the Vp for the least requirement of pasteurization （Vp≥40min） was obtained.
文摘在高温高压实验条件下,对岩石超声脉冲传输测速的研究,在国内外已经做了很多工作,资料甚丰。目前,Kern H(1982)和Lebedev E B(1990)等的实验温度达到了700℃和800℃,Mueller H J等(1988)已达到了1000℃,但总的数据不多。笔者改进了实验方法,实验温度达800℃以上,最高达到1040℃,模拟壳幔的温度条件更接近实际,通过实验作者获得了一批具有新的特征的波速数据,对中。
