In this paper,by constructing the current graph of the complete graph K_(12s+9)and a mapping function,we prove that K_(12s+9)(s is an odd number)has at least 6^(2s)×3^(s+3/2) nonisomorphic orientable quadrangular...In this paper,by constructing the current graph of the complete graph K_(12s+9)and a mapping function,we prove that K_(12s+9)(s is an odd number)has at least 6^(2s)×3^(s+3/2) nonisomorphic orientable quadrangular embeddings,and the orientable genus is(12s+9)(12s+4)/8+1.Every one of the nonisomorphic orientable quadrangular embeddings has at least twenty-four 4-edge-colors,and each color appears around each face of orientable quadrangular embeddings.展开更多
The purpose of this study was to isolate a new compound from the seeds of Combretum quadrangulare Kurz, which showed antibacterial activity. The seeds were macerated with 95% of ethanol and then purified by column chr...The purpose of this study was to isolate a new compound from the seeds of Combretum quadrangulare Kurz, which showed antibacterial activity. The seeds were macerated with 95% of ethanol and then purified by column chromatography using Avicel as the adsorbent. After that, 50% of methanol in water was used as the eluting solvent and continued to further purify by Avicel preparative layer chromatogram 2 times using 80% of methanol in water as developing solvent. MIC of pure compound was done by two fold dilution method. Muller Hinton agar was selected as the media. The new compound was found as combretin, a steroidal alkaloid, and showed antibacterial activity against Escherichia coli ATCC 25922 and Pseudomonas aeruginosa ATCC 27853 better than Staphylococcus aureus ATCC 25923.展开更多
Combretin is the steroidal alkaloid isolated from the seeds of Combretum quadrangulare Kurz. by macerated powder of the seeds with 95% ethanol. Purified further by avicel column chromatography and preparative thin lay...Combretin is the steroidal alkaloid isolated from the seeds of Combretum quadrangulare Kurz. by macerated powder of the seeds with 95% ethanol. Purified further by avicel column chromatography and preparative thin layer chromatography. Combretin was investigated for anti-mycobacterium and anti-cancer activities. Combretin was inactive against Mycobacterium tuberculosis but showed anti-cancer activities against human hepatocarcinoma （Hep G2） ATCC HB-8065 and human caucasian colon adenocarcinoma （Caco2） ATCC HTB-39 at concentration greater than 300 mcg/ml in DMSO （Dimethyl sulfoxide）.展开更多
用扩展有限元法XFEM(Extended Finite Element Method)解决夹杂问题时,夹杂与基质的界面把单元分成若干部分。求单元刚度矩阵时,需要分别在这各个部分求积分。找到便于程序编制的描述各积分区域几何形状的方法是亟待解决的问题。本文把...用扩展有限元法XFEM(Extended Finite Element Method)解决夹杂问题时,夹杂与基质的界面把单元分成若干部分。求单元刚度矩阵时,需要分别在这各个部分求积分。找到便于程序编制的描述各积分区域几何形状的方法是亟待解决的问题。本文把各积分区域的形成过程看成是圆对四边形的多次切割。考虑切剩区域与圆的关系时,把不完整的边仍看作完整的边,把切剩区域看成是四边形或是切去一两条边的四边形。采用排列组合的方法,把它们与圆的所有位置关系列了出来。展开更多
文摘In this paper,by constructing the current graph of the complete graph K_(12s+9)and a mapping function,we prove that K_(12s+9)(s is an odd number)has at least 6^(2s)×3^(s+3/2) nonisomorphic orientable quadrangular embeddings,and the orientable genus is(12s+9)(12s+4)/8+1.Every one of the nonisomorphic orientable quadrangular embeddings has at least twenty-four 4-edge-colors,and each color appears around each face of orientable quadrangular embeddings.
文摘The purpose of this study was to isolate a new compound from the seeds of Combretum quadrangulare Kurz, which showed antibacterial activity. The seeds were macerated with 95% of ethanol and then purified by column chromatography using Avicel as the adsorbent. After that, 50% of methanol in water was used as the eluting solvent and continued to further purify by Avicel preparative layer chromatogram 2 times using 80% of methanol in water as developing solvent. MIC of pure compound was done by two fold dilution method. Muller Hinton agar was selected as the media. The new compound was found as combretin, a steroidal alkaloid, and showed antibacterial activity against Escherichia coli ATCC 25922 and Pseudomonas aeruginosa ATCC 27853 better than Staphylococcus aureus ATCC 25923.
文摘Combretin is the steroidal alkaloid isolated from the seeds of Combretum quadrangulare Kurz. by macerated powder of the seeds with 95% ethanol. Purified further by avicel column chromatography and preparative thin layer chromatography. Combretin was investigated for anti-mycobacterium and anti-cancer activities. Combretin was inactive against Mycobacterium tuberculosis but showed anti-cancer activities against human hepatocarcinoma （Hep G2） ATCC HB-8065 and human caucasian colon adenocarcinoma （Caco2） ATCC HTB-39 at concentration greater than 300 mcg/ml in DMSO （Dimethyl sulfoxide）.
文摘用扩展有限元法XFEM(Extended Finite Element Method)解决夹杂问题时,夹杂与基质的界面把单元分成若干部分。求单元刚度矩阵时,需要分别在这各个部分求积分。找到便于程序编制的描述各积分区域几何形状的方法是亟待解决的问题。本文把各积分区域的形成过程看成是圆对四边形的多次切割。考虑切剩区域与圆的关系时,把不完整的边仍看作完整的边,把切剩区域看成是四边形或是切去一两条边的四边形。采用排列组合的方法,把它们与圆的所有位置关系列了出来。
