点样位置对血清蛋白醋酸纤维薄膜电泳行为的改变

血清蛋白室温下进行醋酸纤维薄膜电泳时，点样线靠近阳极端则有蛋白朝阴极运动，低温下移动方向相同而速度变慢。兰色葡聚糖和溴酚兰在对应条件下电泳表明，主要是薄膜表面溶剂蒸发，造成缓冲液由两端朝中部补充而流动，从而改变了部分低荷质比血清蛋白的电泳行为。此异常现象证实缓冲液流动可改变蛋白质电泳行为，可用于验证电泳影响因素的设计性实验教学。     

用正交法探求纤维素水解的最佳实验条件

在实际教学中，补充检验醛基的另一个实验一银镜反应，对学生认识纤维素性质的知识整合有一定作用．力求从实验的角度，用正交试验法寻求最佳实验条件．     

On the use of ASTM closed vessel tests in accelerated ageing research

The ASTM D6819-02e3 standard for testing the accelerated ageing of paper, published in 2002, recommends using closed glass vials in order to keep the degradation products in contact with the paper and thus permitting a better simulation of the natural ageing conditions inside closed books. In the present study, the actual conditions and their stability inside closed vessels have been evaluated. The necessity of assuring a very high sealing performance (tightness) of the systems in order to avoid leakage of water vapour is the main drawback of this ageing method. Systematic studies presented in this publication tried to monitor this tightness and have provided data that helped to answer the question of what circumstances could lead to achieving its improvement. Both gravimetric monitoring of water content in vials and “in situ” IR measurements of the aged paper humidity have been applied for this purpose. As a result, better sealing materials (gaskets and caps) than those recommended by the ASTM standard, have been found. Additionally, application of a dynamometric spanner for closing the vials is recommended, as this is a guarantee of reasonably high and recurring tightness of the systems used in tests. Nevertheless, the systematic, linear with time, loss of moisture for all used vials was observed. A 9% loss of the initial moisture content in samples of the aged paper was observed for the tested conditions (14 days at 90 °C). Therefore, it seems that including some kind of gravimetric control for ageing tests performed in closed vessels is of essential importance.Kinetic studies of accelerated ageing in both closed and open systems, as monitored by DP and breaking length measurements, unexpectedly show that no statistically meaningful difference of degradation rates can be observed. On the other hand, the pH and whiteness index values reveal a meaningful difference between the rates of ageing in these systems, thus confirming the basic assumption of the ASTM test concerning the interaction of paper degradation products with the paper itself.     

酶在食品工业、轻工业和环境保护上的应用分析

概述了酶在食品工业、轻工业和环境保护中的主要应用。这些酶主要为:淀粉酶、果胶酶、纤维素酶、β-葡萄糖苷酶、蛋白酶、脂肪酶、植酸酶、木聚糖酶、漆酶、过氧化物酶、几丁质酶和几种极端酶,并探讨一些新型酶的应用前景。     

玉米秸秆及纤维素高值化应用的研究进展

文章从玉米产业废弃物玉米秸秆的应用出发,对玉米秸秆从传统方面进行总结,对玉米秸秆纤维素从降解、再生和制备吸附材料三个角度进行高值化应用的综述。     

醋酸纤维薄膜电泳分离血清蛋白实验方法探讨

本文重点对醋酸纤维薄膜电泳分离血清蛋白实验的电泳条件及透明部分作了一些改进，使实验结果较以前清晰，区带明显。