一些商的单调性质

考虑了形如∫xap(t)f(t)dt∫xap(t)g(t)dt　　　　和　　　　∑ki=1piai∑ki=1pibi的两种商在一定条件下所具有的单调性质,推广了某些熟知的结果.     

一个数论函数的四次均值的计算

应用一个正整数的二进制表示,给出一个数论函数的四次均值的精确计算公式.     

在胎儿发育过程中人MK基因的组织差异性表达

MK是肝素结合因子家族中的一个成员，用RT－PCR研究了第11－16周胎儿龄的胎儿的神经组织与非神经组织中MK基因的组织差异性表达，随着胎儿龄的增加，在神经组织中，MK呈现出规律性的从无互有和从低表达到高表达的趋势，提示它可能在胎儿脑的发育中起着重要的作用，在其他非神经组织中，尽管各组织中MK的表达呈现不同的规律，但看起来总的趋势是趋向活跃。     

济阳坳陷红柳地区构造坡折带层序地层学模式与含油气性的关系

在对地震、测井和钻井等资料详细分析的基础上，将济阳坳陷红柳地区在下第三系划分出了7个三级层序，19个体系域．其中层序Ⅰ、层序Ⅳ为两个T-R层序分为两个体系域，即湖扩展和高位体系域，其他层序均为三分层序，划分为三个体系域即低位、湖扩展（水进）和高位体系域．在层序地层单元划分和对比的基础上，结合断层上下盘地层厚度的差异和地层厚度的变化反映古地形，认为济阳坳陷红柳地区在下第三系沉积时期，发育两种不同类型的构造坡折带，并建立了该区的构造坡折带层序地层学模式，研究了构造坡折带层序地层学模式与含油气性的关系，认为第Ⅰ、Ⅱ层序间的界面附近可形成有利的地层不整合覆盖圈闭与构造一岩性圈闭；第Ⅳ层序低位域可作为油气的运载层，在合适构造的匹配下，可形成有利的构造圈闭或构造-岩性圈闭，对有利区带做出了预测．     

根癌农杆菌介导AtNHX1基因转化小麦

利用根癌农杆菌对 3种基因型小麦进行了转化研究 .发现基因型对转化有明显影响 .将小麦品种烟优 36 1、烟 10 3、核生 3号的胚性愈伤组织用含报告基因NPTⅡ和抗盐基因Na H 反向转运AtNHX1的农杆菌菌株pROK2AT GV310 1感染和共培养后 ,用巴龙霉素 5 0 - 15 0mg L筛选抗性愈伤组织及转化植株 .对抗性植株的总DNA用AtNHX1基因的特异引物进行PCR检测 ,目的基因的PCR阳性频率为 1.3(烟 10 3)和 2 .9% (核生 3号 ) .Southern杂交证实外源基因已经整合到小麦的基因组中     

关于Fibonacci数列的两点注记

注记给出了Fibonacci数列两个重要公式的组合表达式,以及Fibonacci数与级数有关的两个新结果。     

Frequent mtDNA mutations and its role in gastric carcinogenesis

In order to disclose the relationship between mutations of mitochondrial DNA (mtDNA) and gastric carcinogenesis, we screened the entire mtDNA sequence in 30 cases of human gastric cancer and matched normal tissues by using denaturing high-performance liquid chromatography (DHPLC) and DNA sequencing. Our data showed that high frequency (66.7%, 20/30) of mitochondrial genome mutation occurred in gastric cancer. Among these variants, 17 cases (56.7%, 17/30) were identified to be somatic mutation. High level mutant frequency was found in ND4, ND5 coding genes and D-loop control region, which was 36.7%, 26.7% and 30% respectively. Comparing with complexes Ⅲ, Ⅳ and Ⅴof the electron transport chain, we found that variants appeared to be more frequent in the subunit genes of complexⅠ. Most of mutations were base substitutions (85.4%, 41/48). Our results suggested that mutations of subunit genes encoding complexⅠ, especially ND3, ND4 and ND5 genes, might contribute to human gastric carcinogenesis.     

提升普通高校学报影响力的措施和方法

分析了普通高校学报影响因子低、影响力小的原因,重点论述了提高普通高校学报被引频次、影响因子和影响力的措施和方法.     

Perceptual learning of dot pattern

Dot pattern is a type of pattern defined by specific spatial relationship among some dots. As a compensation for concrete and meaningful visual stimuli, meaningless dot pattern can be used as stimuli in learning tasks. We performed an experiment for exploring the perceptual learning process of dot pattern against random-dot background. Participants were required to learn two types of dot patterns (9-dot and 11-dot). They were assigned to two groups: participants in Group 1 learned 9-dot pattern first and 11-dot pattern later, while those in Group 2 learned 11-dot pattern first and 9-dot pattern later. The results showed that participants could acquire the spatial relationship of dot pattern through perceptual learning in relatively short learning time. In comparison with 9-dot pattern, learning time of 11-dot pattern was slightly longer and its accuracy rate lower, but there was significant positive transfer effect from 11-dot pattern learning to 9-dot learning.