Genomic DNA was successfully extracted from leaf tissues of two rattan species,Calamus simplificifolius and Daemonorops margaritae,using a modified CTAB method.This method could remove phenolic compounds,polysaccharid...Genomic DNA was successfully extracted from leaf tissues of two rattan species,Calamus simplificifolius and Daemonorops margaritae,using a modified CTAB method.This method could remove phenolic compounds,polysaccharides and proteins,and the quality and quantity of DNA extracted were reliably characterized.In addition,the reaction composition and amplification program for RAPD analysis were developed with GeneAmp PCR System 2700 (Applied Biosystem Co.).This study provided a technological basis for future molecular studies in rattan and the related species.展开更多
采用已经建立的催化重整固定床反应器(Catalytic reforming fixed bed reactor,简称CRFBR)内传递及反应过程的综合数学模型,对工业固定床催化重整反应器进行数值模拟研究。考察了反应温度、反应压力、体积空速和氢/油体积比对产物组成...采用已经建立的催化重整固定床反应器(Catalytic reforming fixed bed reactor,简称CRFBR)内传递及反应过程的综合数学模型,对工业固定床催化重整反应器进行数值模拟研究。考察了反应温度、反应压力、体积空速和氢/油体积比对产物组成的影响。结果表明,高反应温度、低反应压力可以提高产品的芳烃产率,但高反应温度会同时降低液体产物收率,低反应压力会加速催化剂上的积炭。体积空速和氢/油体积比的提高会导致液体产物收率增加和芳烃产率降低。在满足产品质量要求的条件下,各操作参数存在着最优值。引入芳烃产率和液体产物收率的变化量之积,即重整芳产液收积(KI)作为控制参数,以KI达极大值时的反应条件作为最佳反应器操作条件,为催化重整工艺条件的优化提供理论依据。展开更多
文摘Genomic DNA was successfully extracted from leaf tissues of two rattan species,Calamus simplificifolius and Daemonorops margaritae,using a modified CTAB method.This method could remove phenolic compounds,polysaccharides and proteins,and the quality and quantity of DNA extracted were reliably characterized.In addition,the reaction composition and amplification program for RAPD analysis were developed with GeneAmp PCR System 2700 (Applied Biosystem Co.).This study provided a technological basis for future molecular studies in rattan and the related species.
文摘采用已经建立的催化重整固定床反应器(Catalytic reforming fixed bed reactor,简称CRFBR)内传递及反应过程的综合数学模型,对工业固定床催化重整反应器进行数值模拟研究。考察了反应温度、反应压力、体积空速和氢/油体积比对产物组成的影响。结果表明,高反应温度、低反应压力可以提高产品的芳烃产率,但高反应温度会同时降低液体产物收率,低反应压力会加速催化剂上的积炭。体积空速和氢/油体积比的提高会导致液体产物收率增加和芳烃产率降低。在满足产品质量要求的条件下,各操作参数存在着最优值。引入芳烃产率和液体产物收率的变化量之积,即重整芳产液收积(KI)作为控制参数,以KI达极大值时的反应条件作为最佳反应器操作条件,为催化重整工艺条件的优化提供理论依据。
