纤维素酶的活力与棉纤维的失重

研究了纤维素酶活力与织物失重率、断裂强力、表面厚度和弯曲刚度的关系.用三种纤维素酶处理两种全棉织物,将处理结果(失重率等)与以滤纸、CMC、脱脂棉为底物测得的酶活力相比较.结果表明,脱脂棉酶活最能反映纤维素酶对棉织物的水解能力,而CMC酶活与酶的实际水解能力不存在明显的依赖关系.研究还表明,外切酶活较高的Cellu-soft L有利于使织物柔软,内切酶活较高的Cellusoft Plus有利于生物抛光.     

推进学习对传神经网络ACPN

结合Adaboost算法的加权投票机制，提高对传神经网络算法CPN(Counterpropagation Networks)的学习效率，提出新型快速分类算法ACPN．实验证明，新算法的学习最小误差比传统CPN算法下降了96%，训练时间同比下降44%，网络训练阶段误差下降趋势明显稳定，不像传统CPN有一定的波动性．     

The antimitotic drug 4,6-dimethyl-2-amino-3,4,5-trimethoxyphenyl-pyrimidine inhibits the nucleoside transport system of cells from various animal species

4,6-dimethyl-2-amino-3,4,5-trimethoxyphenyl-pyrimidine (B-31) is a pyrimidine derivative previously reported to arrest the mitotic cycle of mammalian cells in metaphase. In the present study it is shown that B-31 also acts as a specific inhibitor of the cellular uptake of nucleosides. The uptake of purinic and pyrimidinic nucleosides is inhibited by 80–90% at concentrations in the range 5–20 μg/ml, whereas those of nucleobases, leucine, choline and glucose are unaltered at the maximum nontoxic dose of B-31 (25 μg/ml). Various mammalian (human, monkey and murine) and avian cell are equally sensitive to the inhibition of nucleoside transport. The antimitotic effect of B-31, by contrast, is species-specific: human cells are the most sensitive whereas monkey and chicken fibroblasts appear resistant to this effect. Both effects can be reversed by removal of B-31 from the medium; inhibition of nucleoside transport can also be reversed by high doses of the nucleosides themselves.     

Phosphotyrosine protein phosphatase and diabetic pregnancy: an association between low molecular weight acid phosphatase and degree of glycemic control

Low molecular weight acid phosphatase encoded by the highly polymorphic locus ACP 1 is a member of the protein-tyrosin phosphatase family (PTPases) which plays an essential role in the control of receptor signalling through phosphotyrosine pathways. Recent experiments have shown that purified rat liver ACP, corresponding to human ACP1, is able to hydrolyze a phosphotyrosine-containing synthetic peptide corresponding to the 1146–1158 sequence of the human insulin receptor, and shows a high affinity for it. This prompted us to analyze the degree of glycemic control in relation to ACP1 genetic variability in a sample of 214 diabetic pregnant women including IDDM, NIDDM and gestational diabetes. The ACP1 genotype was also determined in 482 non-diabetic pregnant women. In diabetic women glycemic levels in thelast trimester of pregnancy appear to be significantly associated with the ACP1 genotype, and correlated positively with ACP1 enzymatic activity. The data suggest that quantitative variations of ACP1 may influence the clincal mainifestations of diabetic disorders, and call for further studies on the role of this enzyme in the modulation of insulin-receptor phosphotyrosine pathways.     

NO_2分子593um波段斯塔克调制谱特性研究

采用ＡＴ＋激光泵浦单模稳频染料激光器，在１６８４０ｃｍ－１－１６８６０ｃｍ－１测量ＮＯ２分子的斯塔克（Ｓｔａｒ）调制谱。用一阶和二阶斯塔克效应对谱线的线型和强度进行了理论分析，并获得了一些激发态的电偶极矩参数．     

藏雪鸡（Tetraogallus tibetanus）冬季活动规律及觅食地的选择

2009年12月～2010年3月间在西藏日喀则南木林县南木林镇岗噶村周围对藏雪鸡的冬季活动规律与觅食地选择进行了初步研究。结果显示,藏雪鸡在该地区冬季主要活动在平均海拔4484.16±242.99m（n=73）,上线海拔达到5233m,下线海拔4213m。日活动强度显示有3个峰点,分别是9：00、12：00、19：00。主要以6～10只为集群的形式觅食。通过对73个样方14个参数进行主成分分析后发现,海拔高度是冬季藏雪鸡活动规律及觅食地选择的最主要因子,植被是次主要因子,坡向是次要因子。     

高职高专非英语专业学生听力现状及教学建议

听、说、读、写、译是英语几项基本技能,而听力的重要性应居首位.如何提高高职高专非英语专业学生的听力水平和技巧,一直是广大英语教师所关心和努力的方向,特别是愈来愈重视培养实用型人才的今天,如何提高高职高专非英语专业学生听力能力,强化训练学生技能,使高职高专学生具备一定的听力水平已经是很多高职院校所面临的重要问题,文章以高职非英语专业学生为对象,并结合现阶段普遍高职高专非英语专业学生的听力学习和教育状况,做出分析,并提出相关的见解.     

天战中动能武器作战仿真系统

本文阐述了天战的概念和内容,对我们研制中的天战中动能武器的作战仿真系统的结构和功能作了介绍,并简单介绍了应用此系统的所得出的一些结果。