Home OALib Journal OALib PrePrints Submit Ranking News My Lib FAQ About Us Follow Us+
 Title Keywords Abstract Author All

Publish in OALib Journal

ISSN: 2333-9721

APC: Only \$99

Submit

2019 ( 24 )

2018 ( 182 )

2017 ( 173 )

2016 ( 185 )

Search Results: 1 - 10 of 14246 matches for " Zuorui Shen "
 Page 1 /14246 Display every page 5 10 20 Item
 生态学报 , 1985, Abstract: 为寻求某些研究r-对策昆虫种群在其生境空间的概率分布的方法,我们用Pesson Ⅲ型曲线(简称P-Ⅲ分布)拟合了菜蚜种群的9批抽样数据,它们是1981年在菜蚜种群发生期的不同日期抽取于北京郊区的秋白菜田间。 我们可以通过MTLK方案将P-Ⅲ分布用于拟含9批样本中经过初步判断具有可拟性的3批数据: M——初值估计采用矩法,即以矩法估计P-Ⅲ分布的三个基本参数:平均数Ex,离势系数Cv和偏差系数Cs,做为下面将要进行的适线法之初始值。 T——P-Ⅲ分布的累积概率值p是由数表给出,具体做法是由给定的Cs值和抽样数据x的标准化变量φ值在数表中查得p值。 L——以适线法实现良好的拟合,该法是在计算机上通过一项最优化技术,即在Cv-Cs直角坐标系中产生一组正三角形(简称GRT法),以自动得到拟合的良好结果。 K——对拟合优度采用柯尔莫哥洛夫检验。 拟合结果,3批样本中有两批可理论地拟合。该P-Ⅲ分布的概率密度函数为f(x)=βα/г(α)(x-b)~(α-1)*exp(-β*(x-b)),(b≤x<∞)其中b=Ex*(1-2*Cv/Cs),α=4/Cs~2,β=2/(Ex*Cv*Cs),经过拟合后,b、α和β的取值便更加适合了。 本文得出的结论是: 1.连续型概率分布可以被用来拟合某些r-对策昆虫种群的田间抽样数据,这是与传统的方法不同的。这里所谓传统的方法是指用于拟合k-对策昆
 Science China Life Sciences , 2004, DOI: 10.1360/03yc0232 Abstract: Olfaction plays a major role in host-seeking behaviour of mosquitoes. An informatics-based genome-wide analysis of odorant-binding protein (OBP) homologues is undertaken, and 32 putative OBP genes in total in the whole genome sequences of Anopheles gambiae are identified. Tissue-specific expression patterns of all A. gambiae OBP candidates are determined by semi-quantitative Reverse Transcription (RT)-PCR using mosquito actin gene as internal expression control standard. The results showed that 20 OBP candidates had strong expression in mosquito olfactory tissues (female antennae), which indicate that OBPs may play an important role in regulating mosquito olfactory behaviours. Species-specific expression patterns of all putative anopheline OBPs are also studied in two of the most important malaria vectors in A. gambiae complex, i.e. A. gambiae and A. arabiensis, which found 12 of the putative OBP genes examined displayed species-differential expression patterns. The cumulative relative expression intensity of the OBPs in A. arabiensis antennae was higher than that in A. gambiae (the ratio is 1441.45:1314.12), which might be due to their different host preference behaviour. While A. gambiae is a highly anthropophilic mosquito, A. arabiensis is more opportunistic (varying from anthropophilic to zoophilic). So the latter should need more OBPs to support its host selection preference. Identification of mosquito OBPs and verification of their tissue- and species-specific expression patterns represent the first step towards further molecular analysis of mosquito olfactory mechanism, such as recombinant expression and ligand identification.
 生态学报 , 2010, Abstract: Responses of bacteria in the presence rhizosphere soil and soil microbial biomass carbon in non-rhizosphere cabbage to elevated CO2 and three concentrations of imidacloprid were examined in the open-top chambers(OTC).Numbers of bacteria in rhizosphere soil increased significantly(P<0.01) with elevated CO2 but imidacloprid had no effect on bacteria.Microbial biomass carbon was lower in non-rhizosphere of cabbage under elevated CO2 than ambient CO2 concentrations when imidacloprid was not applied.Regardless o...
 生态学报 , 2005, Abstract: Hawthorn spider mite (HSM), Tetranychus viennensis Zacher, is an important and damaging pest in apple orchards worldwide and has become the most serious pest on apple in north China. The hosts of this pest are mainly fruit trees of the family Rosaceae. To assess host suitability of deciduous fruit trees in family Rosaceae, a leaf disc bioassay was employed to investigate the influence of five species of deciduous fruit trees, which included apple, peach, plum, cherry, and apricot, on the development and rep...
 生态学报 , 2002, Abstract: Insecticides and natural enemies are the two main means to control insect pests at present. A problem is coming that after spraying of insecticides in the field, some natural enemies were inevitably influenced at lethal or sublethal degree. In order to seek better techniques for coordinating the chemical and biological control measures, and improve the level of integrated pest management, effects of sublethal doses of four insecticides, i.e., imidacloprid, rotenone, fenvalerate and abamectin, on the functio...
 菌物学报 , 2005, Abstract: 微孢子虫是一类专营寄生生活、无线粒体的单细胞真核生物,在分类学上一直归类于原生生物界,原生动物亚界。但最近对微孢子虫分子进化和系统发育的研究认为微孢子虫与真菌具有很近的亲缘关系,美国生物技术信息中心(NCBI)2002年将微孢子虫归类于真菌。本文予以综述和评论。
 生态学报 , 2005, Abstract: The cotton bollworm, Helicoverpa armigera (Hubner) (Lepidoptera: Noctuidae), is the most important pest of cotton in China, causing both quantitative and qualitative losses. Trichogramma confusum Viggiani (Hymenoptera: Trichogrammatidae) is an endemic egg parasitoid of cotton bollworm H. armigera in China and is a potential biological control agent. The availability and quality of food played an important role in determing the effectiveness of parasitoids as control agents. Adult Trichogramma spp. are known...