一阶时滞差分方程解的结点距离估计

讨论了一阶差分方程△x_n+P_nx_(n-k)=0的解的结点距离。     

乡镇企业的二次创业与资本运营

本文简述了乡镇企业发展历程,分析了其面临的挑战和机遇,阐述了资本运营在乡镇企业再创辉煌中的作用.     

多孔硅吸附2,2′菁染料的荧光特性

：由于多孔硅具有独特的表面结构,当吸附２ ,２′菁染料及其Ｊ聚集体后,其发光受到很大影响。实验表明,聚集体的荧光有明显的增强效应,多孔硅与染料分子之间有能量转移。     

模糊揄方法简化铁路混凝土梁可靠性评估

采用基于真值约束的模糊推理方法简化铁路混土梁的可靠性评估过程。针对大量铁路混凝土梁具有很大相似性的特点,该方法在评估混凝土梁可靠性的过程中更展出出其强大的易用性与准确性。通过实例说明了该方法既简便又实用。     

系列硫氮环分子的量子化学从头算研究

本文用量子化学从头算方法对系列硫氮环分子的几何构型进行了全优化,得到了硫氮环分子基态的稳定构型,说明了各环型分子的成键情况。通过各硫氮环分子稳定性的比较,确定只有一部分硫氮环分子具有“多电子芳香性”。预测S_2N_3~+和S_5N_2~(2+)合成的可能性。     

柳永《乐章集》之谐协美赏析

任何艺术的作品,都是以"美"为生命的。虽然历来评柳永词毁誉参半,但不可否认的是,柳永的词作,充满了谐协美。谐协美即通过字音的平仄高低,句读的长短参差,押韵的疏密清浊,来获得文辞的声音和美。柳永的词作从三个方面来达到这种谐协美:一、将字音里不同的声纽、韵母和平仄开合,错综地连缀在一起,充分显示出词句的谐协美;二、善用四声,使音调分明,吟哦朗诵,锵铿愉悦;三、利用双声迭韵,不仅增强了语言的表达效果与感染能力,更可使口吻调和,以增加声调的美听。但柳永词作也有用语造句颇多雷同的缺点,其词甚至多有淫媒之作。     

Genome-wide association and linkage identify modifier loci of lung disease severity in cystic fibrosis at 11p13 and 20q13.2

A combined genome-wide association and linkage study was used to identify loci causing variation in cystic fibrosis lung disease severity. We identified a significant association (P = 3.34 × 10(-8)) near EHF and APIP (chr11p13) in p.Phe508del homozygotes (n = 1,978). The association replicated in p.Phe508del homozygotes (P = 0.006) from a separate family based study (n = 557), with P = 1.49 × 10(-9) for the three-study joint meta-analysis. Linkage analysis of 486 sibling pairs from the family based study identified a significant quantitative trait locus on chromosome 20q13.2 (log(10) odds = 5.03). Our findings provide insight into the causes of variation in lung disease severity in cystic fibrosis and suggest new therapeutic targets for this life-limiting disorder.     

"日常生活审美化"论争语境背景解读

“文艺研究者”的知识分子精英立场定位和强调精神向度的文学价值取向,与“文化研究者”的反知识分子精英立场定位和强调人间情怀的文学价值取向,共同促成了有关“日常生活审美化”的理论论争.     

A rice quantitative trait locus for salt tolerance encodes a sodium transporter

Many important agronomic traits in crop plants, including stress tolerance, are complex traits controlled by quantitative trait loci (QTLs). Isolation of these QTLs holds great promise to improve world agriculture but is a challenging task. We previously mapped a rice QTL, SKC1, that maintained K(+) homeostasis in the salt-tolerant variety under salt stress, consistent with the earlier finding that K(+) homeostasis is important in salt tolerance. To understand the molecular basis of this QTL, we isolated the SKC1 gene by map-based cloning and found that it encoded a member of HKT-type transporters. SKC1 is preferentially expressed in the parenchyma cells surrounding the xylem vessels. Voltage-clamp analysis showed that SKC1 protein functions as a Na(+)-selective transporter. Physiological analysis suggested that SKC1 is involved in regulating K(+)/Na(+) homeostasis under salt stress, providing a potential tool for improving salt tolerance in crops.