查询词典 decrease in population

Objective To detect and evaluate the genetic diversity and differences between SPF golden hamster population and its parent conventional population, and provide useful information and references for quality control of SPF golden hamsters.

目的 检测和评估金黄地鼠封闭群SPF化后的遗传学变化，为SPF金黄地鼠遗传质量的控制提供技术资料。

In Chapter 4,The convergence of two forms of genetic algorithms base donthe feature of the non-formal selection strategies is proved including themodel of genetic algorithms under the population fitness constraints and somehigher fitness individuals in parent population participating in the comp-etition.

第四章以非形式化选择为特点，给出遗传算法的种群适应值约束下算法模型与父代种群前若干适应值高的个体参与竞争下遗传算法的收敛性。

Analyzed the hereditary variation distribution of amylose content in DH population, estimated hereditary capacity and rate over parent in DH population by the model and formul which were presented by Choo and Reibergs, and examined the number of gene pairs and the pattern of gene interaction which controlled these characters.

应用Choo和Reibergs提出的模型及公式，分析了这6个DH群体AC的分布、测算了遗传力、超亲率，检测了AC的基因对数及基因互作方式。

稀有物种,生境损失和灭绝(V1) Founder effect This term describes the establishment of a new population by one or a few individual, resulting in low levels of genetic variation and often a disproportionate number of alleles that are rate in the parent population.

Genetic bottleneck 建立者效应建立者效应描述由一个或几个个体建立新种群，导致低水平的遗传变异和在亲本种群中稀少的等位基因的经常不成比例的数量。

Methods Microsatellite markers of mice and rat were adopted to develop markers and methods suitable for genetic monitoring for SPF golden hamster population and its parent conventional population from Chengdu Institute of Biological Products by fluorescence-based semi-automated genotyping method. Genetic diversity and differences of the 2 golden hamster populations were analyzed based on the result of microsatellite alleles.

应用小鼠和大鼠的微卫星标记筛选适于金黄地鼠遗传检测的微卫星标记，并结合微卫星荧光标记－半自动基因分型技术，对成都生物制品研究所的SPF级金黄地鼠及其来源的普通级金黄地鼠进行遗传检测，计算其群体遗传学参数。

The rapid evolution of a new species from a small population that is partially or totally isolated from the parent population; usually involves a few mutations that have a large impact on the organisms' observable physical traits.

这种方式通常在物种的物理性质上伴随着大规模变化。

The fact that the pink plants were predominant among the population of RP1 cross progeny hints that the pink had the strong descendiblity, Whereas another fact that the plants with the color of another parent were predominant among the population of R01 cross progeny indicates that the nacarat/saffron plant had the low descendiblity. The above results suggest that it is better to choose the pink plants with the target color flower of breeding as a parents when arranging the cross combination. Many novel flowers with singular value of view and admire can be bred by the different cross combination since the wide segregation chromatogram is not confined to the parents'.

以RPl及R01作母本或父本，分别与不同花色杂交，F1代发生了明显的花色分离，RP1的杂交后代均以粉色占优势，表明粉色的遗传力较强，R01的杂交后代均以其它亲本占优势，表明桔黄/桔红的遗传力较弱，因此在选配组合时，最好选择具有育种目标的粉色个体作为亲本；另外由于分离谱较广，且分离的色谱范围并不完全限于双亲之间，可根据不同的杂交配组，培育出具极高观赏价值的稀有花色。

More and more studies have been carried out on population genetic structure of rotifer population and gene flow by molecular technologies to assess the effect of cyclic parthenogenesis and resting egg bank on rotifer's genetics and evolution.

由于循环孤雌生殖和休眠卵库的存在，使得轮虫种群内的遗传变异和种群间基因流模式有别于其他动物。目前，国外有关轮虫分子遗传和进化的研究还刚刚起步，国内还没有这方面的报道。

Grisea have been obtained in recent years as well.In our previous work, an RIL population consisting of 304 lines was constructed from the indica cross Zhong 156/Gumei 2. Two genes conferring complete resistance to blast isolate 92-183 (ZC15) were primarily mapped by using 148 lines of the population. In the present study, genotype of the 304 RILs were analyzed and QTL mapping for partial resistance to 2 isolates of leaf blast and 1 isolate of neck blast were conducted.

本实验室曾经应用中156／谷梅2号构建了由304个重组自交系(recombinant inbred lines，RIL)组成的重组自交系群体，应用其中的148个株系对抗稻瘟病基因进行了初步的定位，本研究则进一步对整个群体的304个RILs的基因型进行了分析，对控制叶瘟和穗瘟部分抗性的QTL进行了定位。

With diameter class increasing, patchiness index decreased gradually and clumping degree of population decreased, trees of diameter class Ⅶ distributed randomly, so the population emerged obvious spreading trend.

随着径级的增大，聚块性指数逐渐减小，种群的聚集程度也减小，Ⅶ级大树呈随机分布，该种群表现出明显的扩散趋势。

"The operators will suffer a temporary decrease in the number of consumers and short message services as people may not like having to provide their ID cards for a phone number," Xu Junqi, vice-dean with the Policy-Making Institute of the Telecommunications Research Centre under MII, said yesterday.

信息产业部下属的通信决策研究院副主任徐俊其昨天说：&实行手机实名制后，人们可能不太情愿用身份证注册手机号，所以通信运营商会暂时面临用户减少和短信用户减少的问题。&

I don't believe in make-believe!

我不相信这些虚构的故事。