Matrix extensions and eigenvalue completions, the generic case

In this paper we provide new necessary and sufficient conditions for the so-called eigenvalue completion problem.

     

微生物实验教学中学生能力培养和科学素质教育

阐述微生物实验教学加强大学生的能力培养和科学素质教育及提高实验队伍的总体素质     

任意实矩阵的优势特征值

对任意实矩阵本文证明了利用位移技术，在不涉及复运算的前提下，可以求得一个或一对优势特征值。并探讨上述结果的数值实现途径．     

板模型中具广义边界条件的迁移算子的谱分析

在LP(1 P<∞)空间研究了板模型中一类带广义边界条件具各向异性、连续能量、均匀介质迁移算子的谱,证明了该迁移算子生成C0半群的D yson—Ph illips展开式的二阶余项在LP(1相似文献   

M矩阵的判定与证明

M矩阵是计算数学中应用极其广泛的矩阵类。本文对n阶方阵A是否为M矩阵给出了几个新的判定定理,并得到结果:(2|aii|-iα)(2|ajj|-jβ)jαiβ,这一结果比过去的结果有明显的进步。     

Fluorescence-based nucleic acid detection and microarrays

Recent analytical innovations for nucleic acid detection have revolutionized the biological sciences. Single nucleic acid sequence detection methods have been expanded to incorporate multiplexed detection strategies. A variety of nucleic acid detection formats are now available that can address high throughput genomic interrogation. Many of these parallel detection platforms or arrays, employ fluorescence as the signaling method. Fluorescence-based assays offer many advantages, including increased sensitivity, safety and multiplexing capabilities, as well as the ability to measure multiple fluorescence properties. Multiplexed microarray platforms provide parallel detection capabilities capable of measuring thousands of simultaneous responses. This review will discuss both single target detection and microarray applications with a focus on gene expression and pathogenic microorganism (PM) detection.     

微生物共培养产生新颖活性次生代谢产物的研究进展

微生物源天然产物是药物先导化合物的重要资源之一.近年来,利用微生物共培养产生各类天然产物的研究发展迅速.微生物共培养是一种通过模拟（微生物）栖息地/栖息环境以激活可能的沉默生物合成基因簇并进而诱导微生物产生新次生代谢物的有效方法.与菌株纯培养相比,共培养不仅增加了次级代谢产物的种类多样性,而且其生物活性及产量也得到了提高.文章就近5年来真菌与真菌、真菌与细菌、细菌与细菌等3种类型的微生物共培养研究成果进行了综述,同时简要介绍了用于分析共培养作用机制的多组学技术,并在此基础上探讨了微生物共培养相互作用机制研究的进展及挑战.综述旨在为微生物共培养的深入研究提供借鉴,并为微生物药物的开发提供新思路.     

The asymptotic behavior of queueing systems: Large deviations theory and dominant pole approximation

This paper presents the exact asymptotics of the steady state behavior of a broad class of single-node queueing systems. First we show that the asymptotic probability functions derived using large deviations theory are consistent (in a certain sense) with the result using dominant pole approximations. Then we present an exact asymptotic formula for the cumulative probability function of the queue occupancy and relate it to the cell loss ratio, an important performance measure for service systems such as ATM networks. The analysis relies on a new generalization of the Taylor coefficients of a complex function which we call characteristic coefficients. Finally we apply our framework to obtain new results for the M/D/1 system and for a more intricate multiclass M/D/n system.     

“黑麦草-水稻”草田轮作系统的根际效应3.黑麦草根系对土壤生物性状的影响

在证实冬种黑麦草改善土壤理化性状的同时,研究对土壤生物性状的影响,结果表明：冬种黑麦草增加了土壤酶的活性,使脲酶活性提高了２．７５倍,转化酶活性提高了９２．６％;土壤微生物生物量增加１３倍;改善了土壤的微生物区系,细菌数量增加１．２倍,放线菌数量增加３．４倍,真菌数量下降了４４％．这些生物性状的改善,对提高地力和后作水稻的生长和发育具有良好的作用．