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population growth     
相关语句
  人口增长
    Method of prediction of population Growth for a Small Region
    小区域人口增长预测方法的探讨
短句来源
    This article focuses on a few ecological and environmental problems that are occuring in the process of current urbanization,such as population growth,water shortage and environmental pollution, and evaluates the measures being taken for the protection of urban ecological environment.
    文章阐述了当代城市化进程中出现的人口增长、供水紧张、环境污染、生态破坏等城市生态环境问题 ,并对城市生态环境保护的对策进行了探讨。
短句来源
    THE STUDY OF THE RELATIONSHIP BETWEEN THE GREENHOUSE EFFECT AND THE POPULATION GROWTH TOGETHER WITH THE ENERGY CONSUMPTION
    温室效应与人口增长、能源消耗间相互关系的探讨
短句来源
    Among the limited evaluation models, the one of sustainable degree lays stress on the key characteristic indices, and choos~the most critical one to construct model. It defines six factors to appraise the sustainable degree. That is economic development, development stage, energy consumption, population growth and environment quality.
    在有限的定量评价模型中,可持续度模型突出了主要表现特征指标,选取最关键、最主要的指标来构建模型,定义了发展阶段因子、经济发展因子、人口增长因子、能源消耗因子和环境质量因子来定量评价区域PRED系统的协调发展程度。
短句来源
    The results indicated: returning cultivated land to woods and grasslands could not be accomplished, unless the rational food self-reliance percentage was determined through controlling population growth rigorously, and keeping stress of bearing capacity of population bellow zero or very little in short time.
    结果表明 ,只有严格控制人口增长 ,并在此基础上确定合理的粮食自给率 ,以保持人口承载能力胁迫力为负值或较小、较短时间内的正值 ,才能退耕还林 (草 ) ,真正实现生态环境的恢复与重建。
短句来源
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  种群增长
    THE MATRIX CALCULATION MODEL FOR POPULATION GROWTH
    种群增长的矩阵计算模型
短句来源
    Some Views on Cui Qiwu-Lawson's Model of Single Population Growth
    对崔启武-Lawson种群增长模型的一些看法
短句来源
    Influence of Five Common Hosts on the Experimental Population Growth of Melon Fruit Fly Dacus Cucurbitae
    五种常见寄主对瓜实蝇实验种群增长影响的研究
短句来源
    TWO NEW POPULATION GROWTH EQUATION
    二个新的种群增长方程
短句来源
    COMPARATIVE STUDIES ON PRINCIPAL PARAMETERS OF POPULATION GROWTH OF FIVE FRESHWATER ROTIFERS
    五种淡水轮虫种群增长参数的比较研究
短句来源
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  种群生长
    THE STUDY OF THE REALATIONSHIP BETWEEN LEYMUS CHINENSIS POPULATION GROWTH AND ENVIRONMENT ON THE GRASSLAND IN THE NORTHEAST CHINA
    东北羊草草原羊草种群生长与环境关系的研究
短句来源
    The Cd2+ 、 Pb2+ 、 Cu2+ exhibited fairly strong inhibition to population growth of tetrahymena pyrifomis. They are the most sensitive to Cd2+ in their environment.
    Cd2+、Pb2+、Cu2+对梨形四膜虫的种群生长具有明显的抑制作用,梨形四膜虫对Cd2+反应最敏感.
短句来源
    Study on Population Growth Processes and Interspecific Competition of Prorocentrum donghaiense and Skeletonema costatum in Semi-continuous Dilution Experiments
    半连续培养下东海原甲藻和中肋骨条藻种群生长过程与种间竞争研究
短句来源
    The population growth and variation of nitrate-N and phosphate-P in the mix-culture of Phaeodactylum tricornutum Bohl and Prorocentrum micans
    海洋原甲藻与三角褐指藻混合培养条件下的种群生长与氮磷营养盐变化
短句来源
    The influence of temperature and thermoperiod on the population growth of the leaf beetle Diorhabda rybakowi Weise was studied in the laboratory and life tables at temperatures from 19°to 35℃ and thermoperiods from 4° to 20℃ were constructed.
    本文分析了七级恒温和五组变温条件下白茨粗角萤叶甲(Diorhabda rybakowi Weise)的种群生长,组建了生命表。
短句来源
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  群体生长
    General situation of environtoxicological research with Tetrahymena pyriformiswas reviewed including population growth kinetics,morphology,structure,behavior and the characteristics of biophysiology and biochemistry.
    总结了以四膜虫为生物模型的环境毒理学研究 ,对各种环境化学毒物胁迫下四膜虫群体生长动力学、形态结构、行为特征以及生理生化特性变化等进行了综述
短句来源
    The Difficulties and Puzzles in Estimation of Microbial Population Growth Parameters in Limiting Growth Environment by Logistic and Monod models
    构建限制性条件下微生物群体生长模型时的问题
    This paper discussed the difficulties and puzzles when describing microbial population growth characteristics in limiting environment by Logistic model and Monod model. Study discovered that Logistic model neglected two important biological parameters, namely generation time and lag phase.
    Logistic和Monod生长模型在表征限制性生长条件下微生物群体生长时遇到种种困难,两种模型都没有明确给出微生物群体生长的延迟期和代时两个重要生物学参数。

 

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  population growth
A new class of competition models in which the population growth coefficients are represented by periodic delta-functions is designed.
      
Analysis of the available field and published data indicates a two-stage pattern of the population growth phase and a synchronous transition of wolf populations to this phase.
      
Selenium in concentrations of 0.01 and 0.5 mg/liter stimulated cell population growth, while the number of ultrastructural alterations was the same as in the control cells.
      
At a selenium concentrations of 1 mg/liter, cell population growth slightly decreased by the end of the experiment, and there was some increase in the number of cells with damaged organoids and in the number of completely destroyed cells.
      
salina, suppressing cell population growth and promoting extensive destructive changes.
      
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The present paper proposes some aspects and procedures for establishing the long-term predictive equation of locust population fluctuations. Three kinds of predictive po-pulation models are introduced and discussed with respect to their practical value. Aseries of locust population data of 50 years, 1913--1962, taken from Hung-Tze Lake, a typical locust region, has been used to analyse the regularity of locust population dyna-mics, from which the effective factors have been selected to build up the predictivemodels....

The present paper proposes some aspects and procedures for establishing the long-term predictive equation of locust population fluctuations. Three kinds of predictive po-pulation models are introduced and discussed with respect to their practical value. Aseries of locust population data of 50 years, 1913--1962, taken from Hung-Tze Lake, a typical locust region, has been used to analyse the regularity of locust population dyna-mics, from which the effective factors have been selected to build up the predictivemodels. 1. Analysis of Outbreak Regularity 1) The running equation, E=(k--2npq)/(npq(1--3pq)~(1/2)) is employed to test the indepen-dence on outbreaks of one another. It is found that some connections are present be-tween two neighbouring outbreaks. This means that each outbreak would be consideredas a continuous part of the population fluctuation sequence which is influenced by theresultant effect of both locust bionomics and environmental factors. 2) Results obtained about the influence of climatic factors, by the analyticalmethods of contingence table and conditional probability, show that a dry climatic year ismore suitable to the locust population growth than wet years, and a dry summer is par-ticularly favorable as compared with spring. Such climatic condition may be expressed bythe climatic index shown as follows: Precipitation saturation deficit<3 andpopulation fluctuation or more useful for establishing thepredictive equations, such as the monthly mean temperature of January, lake water leveland the mortality of overwintering eggs for the summer generation, the flooding area oflower lands and lake water level for the fall generation. 3) In analyses made on periodicity of locust population dynamics, three periodicintervals are evident, and these are 2--3 years, 5--6 years and approximately 25 years.In addition, with the aid of the analysis of integral curve method, a periodicity of 25-year has also been revealed, and it is proved in accordance with the periodicity of drymonths from May to August. 4) The influence of crowding is another biological factor which has to be con-sidered in locust population fluctuation as exhibited by diminution of ovariole number andthe amount of eggs. The interrelationship between them has been calculated based on aseries experiments by using the transcendental equation which gives a well fit. 2. Prediction equations The predictive models are established by the following three methods: 1. By direct extrapolation method on the basis of 1) the analysis of population dynamics of the fluctuation form: First is to analysethe 50-year data by using the method of transition probability matrix of Markov Chain,then it gives two matrices in which we may find the higher transition probabilities oc-curing among the series of population abundances as follows: 2→3, 4→3, or 4→7,→8. 2) the characteristics of population fluctuation sequence: It is indicated that if thevalue of population abundance deviating from the mean level (y = 4.141) is plusor minus 2, the fluctuation tendency will reverse, for example, when x_ix_(i+1)>x_(i+2) then x_(i+3)>x_(i+2), generally x_(i+3)<4.1. 2. By the methods of random sequence and periodical equations based on environ-mental factors and population bionomics: the followng model is used y_t=f(t)+ξ(t)+g(t)(y(t)…predicted value of population abundance, f(t)…tendency factor, ξ(t)…random factor, g(t)…periodical factor) The estimation of these three factors dissolved are f~*(t)=4.475--0.0084t+0.38 sin (π/(12)t) ξ~*(t)=--0.1186ξ(t--1)--0.1452ξ(t--2) g~*(t)=g_7(t)+g_8(t)+…+g_(12)(t) 3. By stepwise multiple regression method: Equations are established based onnumerous variates, many of which have been sifted under given confidence levels (F=1.5,2.5) before they are taken in the predictive models. 1) Linear regression equa

本文以洪泽湖蝗区为例,分析了东亚飞蝗中长期数量预测方程的建立基础,提出三种预测方法:(一)根据种群动态型趋势进行外推估值,(二)应用随机序列及周期方程的预测法,(三)多因素过滤回归预测法,此三种方法虽各有其独立的预测模式,但在应用时应将其视为总预测式中的三个相互补充的部分。

Adults of Tetrastichus hagenowii and Tetrastichodes sp. emerged from the oothe-cae of Periplaneta fuliginosa collected from four places in Zunyi and the parasitism rates of the 'former species were 71.9%, 93.1%. 6.6% and O respectively. The sex ratio of the wasps emerged from fourteen oothecae was 1:0.4 in favous of the female. The maximum mumber of wasps emerged from a single ootheca was 202. Mating took place almost immediately after emergence of the wasps from the oothecae and egg laying soon fallwo-ed. They...

Adults of Tetrastichus hagenowii and Tetrastichodes sp. emerged from the oothe-cae of Periplaneta fuliginosa collected from four places in Zunyi and the parasitism rates of the 'former species were 71.9%, 93.1%. 6.6% and O respectively. The sex ratio of the wasps emerged from fourteen oothecae was 1:0.4 in favous of the female. The maximum mumber of wasps emerged from a single ootheca was 202. Mating took place almost immediately after emergence of the wasps from the oothecae and egg laying soon fallwo-ed. They were very active during the first 2 to 3 days.The wasps began to emerge in early April and the peak of population growth was from May to August. The life span of the females was from 3 to 47 days and that of the males from 2 to 40 days. Development of the immature stages ranged from 29 to 62 days in May and June, but might last 'for months in the winter. The oviposition period was rather long.Based on our results, we consider this species has potential value in biological control of the cockroach.

本文报道了寄生于烟色大蠊Periplaneta fuliginosa(Serville)卵荚内的两种啮小蜂:Tetrastichus hagenowii和Tetrastichodes sp.,并讨论了Tetrastichus hagenowii的生物学特性。所收集的(虫非)蠊卵荚中,该蜂的自然寄生率为50.38%。观察14枚卵荚的出蜂数,最多为202只/枚,最少为10只/枚,平均为74.92只/枚。雌雄性比为1:0.42。该蜂4月上旬开始出现,5—8月是繁殖高蜂期,11月上旬则少见。接蜂的8枚卵荚孵出的成蜂平均存活12.8天(14.4天.10.2天)。蜂在卵荚内的发育时间与温度有关,在夏季比在秋冬季显著为短。成蜂的产卵期较长:而且除产卵于新鲜(虫非)卵荚内,也产卵于已产出7天以上的卵荚内。本文的观察结果为人工繁殖该啮小蜂用以防治室内(虫非)蠊提供了科学依据。

The inhibitory effect of selenium (as sodium selenite) on the population growth of Tetrahymena pyriformis S1 was investigated. Cells were grown either in inorganic salt medium with living Aerobacter aerogenes or yeast cells as particulate food or in liquid proteose peptone-yeast extract medium. The latter was found to be more adequate for the experiments. When the concentration of selenium in the medium was 1.4 ppm, inhibition of population growth began to appear and when it was raised to 140 ppm,...

The inhibitory effect of selenium (as sodium selenite) on the population growth of Tetrahymena pyriformis S1 was investigated. Cells were grown either in inorganic salt medium with living Aerobacter aerogenes or yeast cells as particulate food or in liquid proteose peptone-yeast extract medium. The latter was found to be more adequate for the experiments. When the concentration of selenium in the medium was 1.4 ppm, inhibition of population growth began to appear and when it was raised to 140 ppm, population growth stopped completely. The generation time prolonged with the increase of the selenium concentration. The entrance of selenium into the cells were evidenced by both radioactive 75Se tracer experiment and x-ray fluorescence analysis. Cells inhibited by selenite ion restored growth in the normal medium.

本文主要探讨了硒(以亚硒酸钠形式)对梨形四膜虫生长和分裂的抑制作用。首先研究了不同组份的培养液对四膜虫生长的影响,发现在无机盐溶液中加入细菌或酵母组成的培养液,在使用上不如(月示)胨培养液便利。在0.1%(月示)胨培养液中,获得抑制细胞分裂的最低硒浓度是1.4ppm,完全抑制的硒浓度为140ppm。随着培养液中硒含量的增加,细胞世代时间延长。用放射性~(75)Se示踪法和x射线荧光分析证实了硒进入了四膜虫细胞内。去除硒后,细胞恢复生长繁殖。

 
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