Ultrastructural changes of the leaf cells in response to heat stress in thermo resistant cultivar and thermo sensitive cultivar of Brassica oleracea var. capitata L. were investigated. No ultrastructural change was sh...Ultrastructural changes of the leaf cells in response to heat stress in thermo resistant cultivar and thermo sensitive cultivar of Brassica oleracea var. capitata L. were investigated. No ultrastructural change was shown in mesophyll cell of the thermo resistant cultivar. All membrane bound structure remained intact. However, the cell ultrastructure of thermo sensitive cultivar showed significant changes. One of the major effects of heat stress was the disruption of membrane structure. Chloroplasts and nucleus were extremely sensitive to heat stress.Chloroplasts rounded off in different extents and their outer membranes disappeared. Structural alteration of the thylakoid membrane were visualized. Large amount of plastoglobulis appeared within the chloroplast. Mitochondria were far more resistant to heat stress than chloroplasts. There was no distinct changes of mitochondria structure. Nucleus suffered from serious damage as heat caused disruption of nuclear envelope and condensation of nucleoplasm, showing, eventually, numerous fibrillar granulous material and irregularly shaped hollow spaces presented within the nucleus.展开更多
利用差热分析法对页岩的煅烧温度进行了初步确定,测定了几种烧页岩的活性,并对页岩在不同温度下进行煅烧以使其活性得到激发,利用XRD、SEM等测试方法对掺加页岩的水泥水化后的微观形貌以及矿物组成进行了研究。结果表明:试验所用页岩适...利用差热分析法对页岩的煅烧温度进行了初步确定,测定了几种烧页岩的活性,并对页岩在不同温度下进行煅烧以使其活性得到激发,利用XRD、SEM等测试方法对掺加页岩的水泥水化后的微观形貌以及矿物组成进行了研究。结果表明:试验所用页岩适合的煅烧温度为800℃左右,其活性主要来源于页岩中的粘土质矿物在煅烧时的热分解过程中产生的活性氧化硅和氧化铝;800℃煅烧30 m in后的烧页岩与粉煤灰双掺掺入总量为30%时,可满足P.C42.5水泥的生产。展开更多
文摘Ultrastructural changes of the leaf cells in response to heat stress in thermo resistant cultivar and thermo sensitive cultivar of Brassica oleracea var. capitata L. were investigated. No ultrastructural change was shown in mesophyll cell of the thermo resistant cultivar. All membrane bound structure remained intact. However, the cell ultrastructure of thermo sensitive cultivar showed significant changes. One of the major effects of heat stress was the disruption of membrane structure. Chloroplasts and nucleus were extremely sensitive to heat stress.Chloroplasts rounded off in different extents and their outer membranes disappeared. Structural alteration of the thylakoid membrane were visualized. Large amount of plastoglobulis appeared within the chloroplast. Mitochondria were far more resistant to heat stress than chloroplasts. There was no distinct changes of mitochondria structure. Nucleus suffered from serious damage as heat caused disruption of nuclear envelope and condensation of nucleoplasm, showing, eventually, numerous fibrillar granulous material and irregularly shaped hollow spaces presented within the nucleus.
文摘利用差热分析法对页岩的煅烧温度进行了初步确定,测定了几种烧页岩的活性,并对页岩在不同温度下进行煅烧以使其活性得到激发,利用XRD、SEM等测试方法对掺加页岩的水泥水化后的微观形貌以及矿物组成进行了研究。结果表明:试验所用页岩适合的煅烧温度为800℃左右,其活性主要来源于页岩中的粘土质矿物在煅烧时的热分解过程中产生的活性氧化硅和氧化铝;800℃煅烧30 m in后的烧页岩与粉煤灰双掺掺入总量为30%时,可满足P.C42.5水泥的生产。
