Abstract:由X-射线衍射证明壳聚糖在进行化学改性(羧甲基化)后,晶体结构已破坏,呈无定形结构,因而在任何pH范围内均溶于水。用元素分析法与红外光谱法测定羧甲基壳聚糖的取代度DS>1和脱乙酰化度为84%～92%,由此推断在C_2和C_6位上均有羧甲基取代,化学改性后的壳聚糖为N,O取代(即为N,O-CMC)。由凝胶过滤色谱测得N,O-CMC的分子量约为10~5～10~6,1%(W/V)的N,O-CMC溶液在50s~(-1)时的表观粘度为20mPa·s左右。

Abstract:证明了下列结论,设G是k-连通的n阶无环图,k≥2,若对G中任意k-独立集,X={x_0,x_1,……x_(k-1)},有sum from i=0 to (k-1)|N(X-x_i)|>(k-1)_n,则G为Hamilton-连通图。

Abstract:it was found that the pH of Soy milk decrease as the temperature increase. And the complex reaction between divalent metallic ion and citrate and phyctate causes the pH of Soy milk decrease is proved. So there is no difference between acid coagulation and

Abstract:The effects of chitosan treatment on the charification of apple juice was invest-gated. The content of most compounds of eider was determined and the important phenoli compounds were evaluated by High Pertformanee Liquid Chromatography (HPLC)before and af

Abstract:The catalytic characters of three different lipases were discussed. They were in-volving the optimum pH and temperature, the stability for pH condition and heat, the specificity of fatty acid chains and ester bond position for hydrolyzation and catalysis

Abstract:Foaming and defoaming in RT5 diffuser was investigated. The reslt indicated that foaming and defoaming in RT5 diffuser had their specific characteristics. The seleclion of defoamers and how to use effective and economic defoamers in RT5 diffuser were dis-

Abstract:In this paper, the behaviors of the gas wave in the receiving tybes are analysed. Through the analysis, the ideal boundary conditions for the two types of receiving tubes and their wave-graphs are given. Then, the formulas for calculating of the optimal l

Abstract:According to projection geometry basal Principle, by means of perspective corre-spondence and transformation, the article puts forward a new method of drawing for mir-rorimage of inclined mirror plane of interior two-point perspective. The method possesse

Abstract:Technology parameters of weaving plume fabrics are systematicly tested. Struc-tural aspects of high pick fabric and its technological aspects during weaving are analysed. At the same time a serie of improving measures for producing high pick fabrics are s