Nowhere‐zero flows in tensor product of graphs

In this paper, we characterize graphs whose tensor product admit nowhere‐zero 3‐flow. The main result is: For two graphs G₁ and G₂ with δ ≥ 2 and G₂ not belonging to a well‐characterized class of graphs, the tensor product of G₁ and G₂ admits a nowhere‐zero 3‐flow. © 2006 Wiley Periodicals, Inc. J Graph Theory 54: 284–292, 2007     

The effect of light and dye composition on the color of dyeings with indigo, 6-bromoindigo,and 6,6′-dibromoindigo,components of Tyrian purple

Quantitative HPLC and colorimetry are used to study color variations in dyeings with indigo, 6-bromoindigo, and 6,6′-dibromoindigo, the main components of the historic dye Tyrian purple. For the first time, visible light is identified conclusively as a cause of debromination of the leuco form of 6-bromoindigo. A dyeing run using 6-bromoindigo alone is found to yield a dyed fabric containing large amounts of indigo, when the vat is exposed to visible light. The extent of debromination is dependent upon the pH of the dye bath and also the source of the visible light. This information allowed development of a dyeing procedure which is demonstrated to give consistent colors through two passes. Quantitative HPLC analysis of extracts from the dyed fabrics indicates that the leuco form of 6-bromoindigo vs. the leuco forms of indigo and 6,6′-dibromoindigo has the strongest affinity for wool fabric. This is postulated to be due to attractive electrostatic interactions between the leuco form of 6-bromoindigo and wool.

     

新疆榅桲中总皂苷的光度测定

采用分光光度法对榅桲中的皂苷成分进行研究,测定了榅桲中的总皂苷,回归方程为y=0.1028 2.17ρ,r=0.9973,七叶苷标准溶液在0.094~0.564 mg/mL范围内有很好的线性关系。用正交设计法优化了实验条件。回收率为80%~94%。