华凤大学镇对南充市的影响

提出了大学镇的概念，通过华风大学镇的建设，从地方经济，城乡劳动力就业，城市化进程，城市布局，交通，人的观念，环境等方面阐述所带来的积极效应和负面作用．并提出一些建议，以达到社会、经济、环境三方面效益的最优化．     

一类带跨越多重本征值非线性项的半线性椭圆边值问题的多解性

本文讨论了n维光滑有界区域上当非线性项g满足适当增长条件时半线性椭圆边值问题—△u=g(x,u)在Ω中,u=O在αΩ上,三个解的存在性.     

自动化弧焊过程在线质量监测与管理平台

以机器人焊接的生产线质量自动监测及管理为对象，采用基于网络的车间级前沿机及服务器分别实现现场单个质量监控点的微观质量监测及整个流水线的宏观质量管理，探讨了流水线加工过程通用性质量监控平台的构建方法，同时还探讨了数据集市和数据挖掘技术系统在该系统的应用。     

软件无线电及在调制技术中的应用研究

本文简要地介绍了软件无线电的发展和基本概念,详细地叙述了软件无线电的体系结构,讨论了FM调制的数字化实现方法。     

2—赋范空间的一个不动点定理

本文给出2-赋范空间一致凸、一致正规结构、正规结构概念,指出这类空间具有不动点性质。     

降低地下卷取机助卷辊冲击负荷的措施

在理论分析和试验研究的基础上，找出地下卷取机助卷辊冲击负荷过大 的主要原因。通过调整工艺参数和设备状况，使助卷辊的冲击负荷显著降低。     

The effect of splenectomy on the development of experimental pyelonephritis

Summary Although an unusually high incidence of a variety of infections in infants who had undergone splenectomy has been reported by a number of investigators the subject remains somewhat controversial. In the present experiments the role of the spleen in the protection of rats against experimentally induced hematogenous pyelonephritis was studied. The results of this study suggest that the spleen has an important preventive function against bacterial infection.     

Intragenic tandem repeats generate functional variability

Tandemly repeated DNA sequences are highly dynamic components of genomes. Most repeats are in intergenic regions, but some are in coding sequences or pseudogenes. In humans, expansion of intragenic triplet repeats is associated with various diseases, including Huntington chorea and fragile X syndrome. The persistence of intragenic repeats in genomes suggests that there is a compensating benefit. Here we show that in the genome of Saccharomyces cerevisiae, most genes containing intragenic repeats encode cell-wall proteins. The repeats trigger frequent recombination events in the gene or between the gene and a pseudogene, causing expansion and contraction in the gene size. This size variation creates quantitative alterations in phenotypes (e.g., adhesion, flocculation or biofilm formation). We propose that variation in intragenic repeat number provides the functional diversity of cell surface antigens that, in fungi and other pathogens, allows rapid adaptation to the environment and elusion of the host immune system.     

Fermentation of xylose to produce ethanol by recombinant <Emphasis Type="Italic">Saccharomyces cerevisiae</Emphasis> strain containing <Emphasis Type="Italic">XYLA</Emphasis> and <Emphasis Type="Italic">XKS1</Emphasis>

Fermentation of the pentose sugar xylose to produce ethanol using lignocellulosic biomass would make bioethanol production economically more competitive. Saccharomyce cerevisise, an efficient ethanol producer, cannot utilize xylose because it lacks the ability to convert xylose to its isomer xylulose. In this study, XYLA gene encoding xylose isomerase (XI) from Thermoanaerobacter tengcongensis MB4T and XKS1 gene encoding xylulokinase (XK) from Pichia stipitis were cloned and functionally coexpressed in Saccharomyces cerevisiae EF-326 to construct a recombinant xylose-utilizing strain. The resulting strain S. cerevisiae EF 1014 not only grew on xylose as sole carbon source, but also produced ethanol under anaerobic conditions. Fermentations performed with different xylose concentrations at different temperatures demonstrated that the highest ethanol productivity was 0.11 g/g xylose when xylose concentration was provided at 50 g/L. Under this condition, 28.4% of xylose was consumed and 1.54 g/L xylitol was formed. An increasing fermentation temperature from 30℃ to 37℃ did not improve ethanol yield.     

生命表理论与方法

本文给出了寿命分布的极大似然估计, 从而给出了现时人口寿命各参数的严格的概率意义, 并利用1990年人口普查10%抽样数据, 求得中国人口寿命表和简略寿命表。