以SDS作为解离剂,采用常规SDS法、改进的SDS法及SDS高盐低pH法分离提取蔓茎堇菜基因组DNA.比较3种方法的提取效果,结果表明:常规SDS法DNA得率高但完整性及纯度较差;改进的SD S法D N A质量好但得率相对较低;只有SDS高盐低pH法是最为理想...以SDS作为解离剂,采用常规SDS法、改进的SDS法及SDS高盐低pH法分离提取蔓茎堇菜基因组DNA.比较3种方法的提取效果,结果表明:常规SDS法DNA得率高但完整性及纯度较差;改进的SD S法D N A质量好但得率相对较低;只有SDS高盐低pH法是最为理想的提取方法,不同组织提取的DNA相对分子质量均大于48kb,260nm/280nm光密度比值在1.7~1.9之间,产率为479.0~543.9μg/g,所得DNA可直接用于限制性内切酶酶切,并适于进行RAPD分析.展开更多
The kinds and activities of proteolytic enzymes in the digestive systems (tongue, esophagus, stomach, duodenum, liver, pancreas and large intestine) of two Amur tiger cubs (Panthera tigris altaica) were investigated u...The kinds and activities of proteolytic enzymes in the digestive systems (tongue, esophagus, stomach, duodenum, liver, pancreas and large intestine) of two Amur tiger cubs (Panthera tigris altaica) were investigated using protein detection and SDS-G-PAGE. The results showed:1) the digestive system of Amur tiger cubs had 30 different kinds of proteolytic enzymes ; 2) the mostly optimal pH for these enzymes was a neutral environment, and an acid condition highly restrained their activity; 3) the proteolytic enzymes in the tongue and esophagus were fewer than in other digestive organs and their activities were weak as well; 4) the duodenum had the most kinds of proteolytic enzymes with the strongest activities under various pH conditions; 5) the 16 kD enzyme bands always existed under neutral and alkalescence pH conditions in all digestive organs except the tongue.展开更多
文摘以SDS作为解离剂,采用常规SDS法、改进的SDS法及SDS高盐低pH法分离提取蔓茎堇菜基因组DNA.比较3种方法的提取效果,结果表明:常规SDS法DNA得率高但完整性及纯度较差;改进的SD S法D N A质量好但得率相对较低;只有SDS高盐低pH法是最为理想的提取方法,不同组织提取的DNA相对分子质量均大于48kb,260nm/280nm光密度比值在1.7~1.9之间,产率为479.0~543.9μg/g,所得DNA可直接用于限制性内切酶酶切,并适于进行RAPD分析.
文摘The kinds and activities of proteolytic enzymes in the digestive systems (tongue, esophagus, stomach, duodenum, liver, pancreas and large intestine) of two Amur tiger cubs (Panthera tigris altaica) were investigated using protein detection and SDS-G-PAGE. The results showed:1) the digestive system of Amur tiger cubs had 30 different kinds of proteolytic enzymes ; 2) the mostly optimal pH for these enzymes was a neutral environment, and an acid condition highly restrained their activity; 3) the proteolytic enzymes in the tongue and esophagus were fewer than in other digestive organs and their activities were weak as well; 4) the duodenum had the most kinds of proteolytic enzymes with the strongest activities under various pH conditions; 5) the 16 kD enzyme bands always existed under neutral and alkalescence pH conditions in all digestive organs except the tongue.