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The effects of small range of changes of Ca(superscript 2+) and Mg(superscript 2+) concentrations (0-100 mg/L) on the survival rate and growth were studied in the larvae from the mysis Ⅲ(M3) to the postlarval 10 (P10) stages of Litopenacus vannamei. Larvae were raised in artificial water prepared from condensed sea water and tap water.

采用浓缩海水与自来水调配的基础海水，以凡纳滨对虾Ⅲ期糠虾幼体(M3)作为试验对象，在小范围(0~100 mg/L)内调节育苗用水中Ca(上标 2+)、Mg(上标 2+)浓度，以L9(3^4)正交表设计，研究育苗用水中不同Ca(上标 2+)、Mg(上标 2+)浓度对凡纳滨对虾M3育成仔虾(P10)的成活率和生长的影响。

Toxicity effects of heavy metals and polluted dredged materials on juvenile of Sinonovacula constricta, straighthinge of Ostrea plicatula, and larvae of Artemia, larvae of Penaeus pencillatus have been studied.

研究了重金属和污染疏浚物对缢蛏Sinonvaculaconstricta稚贝和幼贝、褶牡蛎Ostreaplicatula幼虫、甲壳类的卤虫Artemiasp。

When transgenic rape leaves were fed to Plutella xylostera, mortality of second instar larvae ranged from 33％ to 47％ and the survival larvae had a less weight than the control.

对叶绿体转化植株进行虫试，结果表明，8天后小菜蛾幼虫的死亡率为33％-47％，未死亡的幼虫比对照体重减轻。说明所获得的叶绿体转基因植株具有杀虫和抑制幼虫生长的作用。

A: A single negative stool examination does not exclude a parasitic infection, since the sample may have been collected during the prepatent period (i.e., the time between infection and the production of detectable ova or larvae) or because the target organism may have been shed inconsistently or in low numbers, as is frequently the case with strongyloides larvae.

一次大便虫卵和寄生虫检查的阴性结果不能排除寄生虫感染，因为样本可能在潜伏期还暂时没有异常（如在感染和产生可以检测到的虫卵或幼体前）或者所关注的微生物已经排出，或者数量太少，如类圆线虫属。

ResultsCyromazine had a great toxicity to firs t-instar larvae of housefly with LC 50 value of 43.896 mg/L, and showed less toxic actio n to third-instar larvae and adults of housefly, but reduced the pupate, ecl osion, female oviposition and egg hatch.

结果 灭蝇胺对家蝇 1日龄幼虫的 48h的LC5 0 值为 43 。896mg/L ，对 3日龄幼虫和成蝇的毒杀效果较差，但可引起幼虫化蛹率、羽化率以及雌成蝇产卵量和卵孵化率明显下降；阿维菌素对家蝇 1日龄、3日龄幼虫和成蝇表现出较强的急性毒杀作用，其 48hLC5 0 值分别为 0 。162 1mg/L、1.5546mg/L和 0 。2 10 3mg/L ，而对家蝇生长发育无不良影响。

Stimulus of 15°C, while newly hatched larvae were. The results indicate that the mental course of S. ratti larvae external to the host is determined at a relatively early stage before the first molt.

而且通常在15℃是属於比较没有刺激性且可以激化孵化能力的低温度，此实验主要是利用在不同温度下，对於一开始幼虫孵化的较早阶段，是否造成后来的感染力有所不同。

The study suggested that the optimal method not only enhanced the affinity and the maximum reaction velocity of α-amylase with its substrate, but also improved the accuracy and the sensitivity on the activity of α-amylase from M. separata larvae in assays, whereas it was not the optimal method for determining the activity of α-amylase from T. molitor, C. pipiens pollens and M. domestica larvae.

结果说明，在该优化体系下，粘虫α-淀粉酶与底物的亲和力增强，最大反应速度增大，测定酶活性的准确性和灵敏度显著提高；同时该优化体系也可作为测定德国小蠊α-淀粉酶活性的优化方法，但不适合作为黄粉虫、淡色库蚊和家蝇α-淀粉酶的最优化测定方法。

Based on increasing resistance of stored grain insect pest to chemicals and decreasing fumigants, the effects of ethyl formate on eggs, early larvae, late larvae, pupae and adults of Sitophilus oryzae were systematically studied with the sealed jar fumigation method under different conditions.

针对储粮害虫抗药性日趋严重、粮食熏蒸剂品种越来越少的现状，采用密闭熏蒸法，系统研究甲酸乙酯在不同条件下对米象Sitophilusoryzae卵、低龄幼虫、高龄幼虫、蛹以及成虫的致死作用。

To clarify the acetylcholinesterase changes among different developmental stages of Tribolium castaneum, the toxicological and biochemical characterizations of AChE in 10-d larvae, 20-d larvae, pupae and adults were investigated, respectively with the microplate reader method.

为了阐明赤拟谷盗体内乙酰胆碱酯酶在其各虫态间的变化关系，以期为该虫的综合治理提供一定的理论依据，本试验采用微量滴度酶标板法，分别对其10d龄和20d龄幼虫、蛹及成虫体内AChE的生化及毒理学特性进行了较为系统的研究。

The lethal effects of ethyl formate on the eggs,early larvae,late larvae,pupae and adults of Tribolium castaneum were systematically studied under laboratory conditions with EtF fumigation with different dosages,treatment duration and temperature.

在不同的药剂浓度、处理时间和温度下系统研究甲酸乙酯对赤拟谷盗T.castaneum卵、低龄幼虫、高龄幼虫、蛹以及成虫的熏蒸致死作用，结果表明处理时间和温度显著影响甲酸乙酯对赤拟谷盗各虫态的熏蒸致死效果。

The second is to cut a mere 100 calories from your diet , which is the equivalent of a tablespoon of butter.

第二个就是从你的饮食中减少一百卡路里，只是相当于一大汤匙的黄油。

This is where the Rorschach test comes in.

现在，罗氏测试就出现了。