论文部分内容阅读
,PERMANENCE OF A NONLINEAR PERIODIC PREDATOR-PREY SYSTEM WITH PREY DISPERSAL AND PREDATOR DENSITY-IN
【机 构】
:
College of Math.and Computer Science,Fuzhou University,Fuzhou 350002
【出 处】
:
微分方程年刊(英文版)
【发表日期】
:
2009年3期
其他文献
实验室条件下获得了壬基酚(Nonylphenol,NP)对波纹巴非蛤(Paphia undulata)的96 h LC50值为0.26 mg/L.同时研究了波纹巴非蛤外套膜中超氧化物歧化酶(SOD)活性、过氧化物酶(PO
叶绿素的生物合成是一个非常复杂的过程,当植物基因组的某些位点发生变异会影响叶绿素的代谢,从而导致植物的叶色发生改变。叶色突变体不仅在研究叶绿素生物合成途径,叶绿体结构、功能、遗传、分化与发育以及细胞遗传转化、基因表达调控等研究中具有重要意义,还可作为形态标记在生产实践中应用。通过化学诱变水稻品系10079,得到一份黄绿叶突变体ygl80,研究了该黄绿叶突变体的形态特征、农艺性状、生理特性,利用其与
This paper studies the number of limit cycles of some Z3-equivariant near-Hamiltonian systems of degrees 3 and 4, which arc a perturbation of a cubic Hamiltonia
陆地棉矮杆资源较少,陆地棉超矮杆是一种新发现突变体材料。本项目组前期对其遗传规律的研究表明,超矮杆突变性状是受一对完全隐性基因du控制的质量性状,遗传方式简单,是赤霉素(G
Background: Various models have been applied to predict the trend of the epidemic since the outbreak of COVID-19.Methods: In this study,we designed a dynamic gr
作为世界第三大规模的专业展会,中国国际机床展(CIMES)2014将强势袭来,他们凭借专业的服务团队、强大的资源系统,完善的平台做出庄重承诺,参加CIMES,获得的不仅仅是买家。有
Segmentation and classification of high resolution imagery for mapping individual species in a close
In this paper we investigate the use of a shadow-based delineation program for identifying segments in imagery of a closed canopy, deciduous forest, in West Vir
,Analysis of alternative cleavage and polyadenylation in mature and differentiating neurons using RN
Background:Most eukaryotic protein-coding genes exhibit altative cleavage and polyadenylation (APA),resulting in mRNA isoforms with different 3’untranslated re