A new triterpenoid saponin was isolated from Lonicera fulvotomentosa.The structure of the new tri-terpenoid saponin,named Fulvotomentoside B,was elucidated as 3-O-β-D-xylopyranosyl(1→3)-α-L-rhamnopyranosyl(1→2)-α...A new triterpenoid saponin was isolated from Lonicera fulvotomentosa.The structure of the new tri-terpenoid saponin,named Fulvotomentoside B,was elucidated as 3-O-β-D-xylopyranosyl(1→3)-α-L-rhamnopyranosyl(1→2)-α-L-arabinopyranosyl hederagenin-28-O-β-D-xylopyranosyl(1→6)-β-D-glucopyranosyl ester on the basis of spectroscopic analysis as well as chemical methods.In addition,the structure of Fulvotomentoside A,the previously reported major saponin,was revised,and it should be 3-O-β-D-xylopyranosyl(1→3)-α-L-rhamnopyranosyl(1→2)-α-L-arabinopyranosyl hederagenin-28-O-β-D-glucopyranosy(1→6)-β-D-glucopyranosyl ester(Decaisoside E) on the basis of careful analyses of new spectroscopical data.展开更多
随着无线通信技术的发展,基于GPRS(General Packet Radio Service)的移动应用系统如雨后春笋般快速发展了起来,但另一方面,GPRS平台本身的安全漏洞也给各种应用带来了不少的麻烦,移动通信环境下的信息安全问题日益突出。提出了一种GPRS...随着无线通信技术的发展,基于GPRS(General Packet Radio Service)的移动应用系统如雨后春笋般快速发展了起来,但另一方面,GPRS平台本身的安全漏洞也给各种应用带来了不少的麻烦,移动通信环境下的信息安全问题日益突出。提出了一种GPRS接入方案,并且针对信息安全问题,综合运用VPN、动态密码技术、访问认证和开发应用安全等技术手段,提出了相应的解决方案,实践表明,系统达到了预期的目标。展开更多
文摘A new triterpenoid saponin was isolated from Lonicera fulvotomentosa.The structure of the new tri-terpenoid saponin,named Fulvotomentoside B,was elucidated as 3-O-β-D-xylopyranosyl(1→3)-α-L-rhamnopyranosyl(1→2)-α-L-arabinopyranosyl hederagenin-28-O-β-D-xylopyranosyl(1→6)-β-D-glucopyranosyl ester on the basis of spectroscopic analysis as well as chemical methods.In addition,the structure of Fulvotomentoside A,the previously reported major saponin,was revised,and it should be 3-O-β-D-xylopyranosyl(1→3)-α-L-rhamnopyranosyl(1→2)-α-L-arabinopyranosyl hederagenin-28-O-β-D-glucopyranosy(1→6)-β-D-glucopyranosyl ester(Decaisoside E) on the basis of careful analyses of new spectroscopical data.
文摘随着无线通信技术的发展,基于GPRS(General Packet Radio Service)的移动应用系统如雨后春笋般快速发展了起来,但另一方面,GPRS平台本身的安全漏洞也给各种应用带来了不少的麻烦,移动通信环境下的信息安全问题日益突出。提出了一种GPRS接入方案,并且针对信息安全问题,综合运用VPN、动态密码技术、访问认证和开发应用安全等技术手段,提出了相应的解决方案,实践表明,系统达到了预期的目标。
