查询词典 lethal dose

The number of chickens in each group is 16 for SPF chicken At 4 weeks of age, chickens were eye-drop immunized with the recommended dose of commercial IBV vaccine, or vaccinated intradermally via wing with 5×106 PFU rFPV-IBVS1 or 5×106 PFU S-FPV-017. Four weeks after vaccination, chickens in all groups were challenged by bronchitis injection with a lethal dose (0.2ml 8.5EID50/0.1ml) of IBV XJ3 strain After challenge, chickens immunized with rFPV-IBVS1 and commercial IBV vaccine were all protected from death; the result indicated that rFPV-IBVS1 can protect chickens from the infection of IBV.

攻毒后的结果显示所有含rFPV-IBVS1免疫组的SPF鸡均100%保护而免于死亡；IBV弱毒疫苗免疫的SPF鸡也获100%保护，免疫以后的抗体跟踪检测证明rFPV-IBVS1诱导的抗IBV抗体水平低于IBV弱毒疫苗免疫组；攻毒后进行的IBV分离和PCR检测结果表明IBV弱毒疫苗免疫的SPF鸡能够更好地阻止攻击强毒的感染。

Physiological Responses of Hybrid Striped Bass to Aqueous Copper copper is an abundant trace metal, and although essential at low levels, it is also potentially toxic to aquatic organisms.Mechanisms of toxicity and consequences of exposure vary depending on ionoregulatory status(acclimated to freshwater or salt water).The goal of this research was to examine the responses of hybrid striped bass(Morone chrysopsXMorone saxatilis)exposed to Cu in freshwater and 15g/L salt water.In freshwater,a general dose-and time-dependent pattern of increasing Cu accumulation in gill tissue was evident in fish exposed to aqueous Cu(220 and 447 mg/L)for up to 96 hours.The 96-horu acute median lethal concentration for freshwater-acclimated hybrid striped bass exposed to Cu was 94mg/L(confidence interval=62 to 144mg/L).

生理反应到水的混合条纹鲈鱼铜是一个丰富的微量金属，虽然至关重要，它是在较低的水平也可能对水生生物有毒毒性机制及其后果的曝光取决于ionoregulatory状态，本研究的主要目的是为了检查的反应chrysopsXMorone混合条纹鲈鱼暴露于铜在淡水和15 / L盐水在淡水，一般dose-and时变模式日益增长的铜积累鱼鳃组织显然暴露于含水的铜(220和447毫克/升)长达96小时96-horu致命的平均浓度为freshwater-acclimated急性混合条纹鲈鱼暴露于铜被94mg / L(=置信区间来144mg / L)62 osmolatity、钠浓度降低。

Methods Ponceau 4R was administrated orally to different groups of Drosophila melanogaster, Median lethal dose （LC50） was estimated by acute toxicity test; lifespan was tested by drosophila survival experiment; superoxide dismutase and maleic diadehyde were evaluated at different periods.

方法经口喂饲果蝇不同浓度胭脂红，通过急性毒性试验测定胭脂红半数致死浓度（median lethal dose，LC50），采用生存试验检测果蝇寿命，测定不同时间果蝇体内总超氧化物歧化酶（superoxide dismutase，SOD）活性及丙二醛（maleic dialdehyde，MDA）含量。

Brain ischemic preconditioning is that transient ischemia in sublethal dose will result in tolerance to the following ischemia in lethal dose for long time.

脑缺血预处理即给予短暂亚致死量缺血可对随后的长时间致死性缺血损伤产生耐受。

The inhibition effects became stronger with the increase of the irradiation dose. Semi-lethal dose of Ailanthus altissima Swingle seeds was 50Gy. 50~75Gy could be considered as the proper dose for seed irradiation treatment of Ailanthus altissima Swingle.

结果表明：辐照抑制了种子的萌发，成苗率下降，幼苗生长受到抑制，且随着剂量的增加，抑制作用增强；椿树种子的半致死剂量为50Gy，适宜辐照剂量为50~75Gy。

The local injection of trypsin can be used in clinical practice as a new and effective therapy for snakebite.Our experiments indicate that when a lethal dose of crotalinae snake venom was injected into mice subcutaneously, survival rate increased significantly if a dose of trypin had been injected locally and promptly.

本文提供了一种局部注射胰蛋白酶治疗蛇伤的方法，在给小白鼠皮下注射致死剂量的竹叶青蛇毒后，立即注射胰蛋白酶可提高存活率68％，注射蝮蛇毒后，立即注射胰蛋白酶可提高存活率67％，注射尖吻蝮蛇毒后立即注射胰蛋白酶可提高存活率57％。

The character of hemagglutination of the virus could be inhibited by the antiserum of Newcastle disease virus.According to the international standard and method of virulence judgement of NDV, we measured the average death time、the minimal lethal dose and the median infective dose(EID50) of chicken embryos and the intracellular inoculation pathopoiesis index of 1-day-old chicks.

参照国际上规定的新城疫病毒毒力判定标准及其方法对分离毒株ZH1、ZH2进行了鸡胚最小致死量和平均死亡时间、鸡胚半数感染量(EID50)以及1日龄鸡脑内接种致病指数测定，结果ZH1、ZH2株的MDT为52h和44 h，EID50为106.4/ 0.1mL和108.64/ 0.1mL，ICPI为1.93和1.975。

In clean diluent condition, the median lethal concentration (MLC50) of CIO2 against bacteria and yeast was 9.4 and 8.4 ppm, respectively. In dirty diluent condition, the MLC50 of CIO2 against bacteria and yeasts was 39.9 and 24.3 ppm, respectively. The virucidal activity of CIO2 against 100 median embryo lethal dose (100 ELD50) of Newcastle disease virus, avian influenza virus, infectious bronchitis virus and infectious bursal disease virus was 1.2, 1.2, 2.5 and 1.2 ppm, respectively.

发现CIO2在乾净稀释液中对细菌和酵母菌的中间致死浓度(MLC50)分别为9.4和8.4ppm，CIO2在污浊稀释液中对细菌和酵母菌的MLC50分别为39.9和24.3ppm，CIO2之杀灭新城病病毒、H6N1型家禽流行性感冒病毒、传染性支气管炎病毒和传染性华氏囊炎病毒的浓度分别为1.2、1.2、2.5和1.2ppm。

The seeds of Adzuki bean were irradiated by 60 Co γ ray of 0～700Gy.The results showed that:(1)The sub\|lethal dose(LD 50 )was 389Gy and the early seedling leaf at M\-1 showed incised,chlorotic,yellow,mosaicand curly edge.The absorbed dose was related with the rate of misshaped leaf.Chromosomal aberration, chromosome bridge and fragment of M\-1 in the tip were observed.If the seed was irradiated with 400Gy,the rate of abnormal cell at the root was more than 10%.The relationship between pollen fertility and irradiation dose was negative correlated.

本试验研究结果表明：60 Coγ射线辐照小豆种子的半致死剂量平均为 3 89Gy ，且M1生长初期叶片性状有明显的叶面缺刻、叶色缺绿、叶形不对称、叶缘卷曲、花叶、黄叶等致变现象，各种畸型叶出现频率与辐照剂量大小有关；M1根尖细胞中有多种染色体畸变类型，以染色体桥和断片频率较高，辐照剂量在 40 0Gy以上时根尖细胞异常率达 1 0 %以上；植株花粉育性与辐照剂量呈极显著负相关，京农 2号植株花粉育性达 5 0 %时的辐照剂量为 3 78Gy。

The test results of acute toxicity were examined with Pearson's degree of fitting. The results indicated that the silkworm was extremely sensitive to Chlorantraniliprole. The median lethal concentration (LC50) was 4.0905×10^(-3) mg/L and median lethal dose (LD50) was 1.1435×10^(-8) mg/larva for the 3rd instar newly exuviated larvae. No toxicity was observed when normal concentrations of Chlorantraniliprole were used to fumigate the silkworm rearing room. Both irrigation and leaf spraying with 1.25×10^(-4) mg/L Chlorantraniliprole solution showed strong systemic transmission properties in root, leaf and whole plant. The residual toxic period of this insecticide to silkworm was very long. Mulberry leaves sprayed with 1.25×10^(-4) mg/L Chlorantraniliprole solution could still cause 100% mortality of the 3 and 5 instar larvae after 60 d. Furthermore, toxic reaction was very quick. The poisoning symptoms emerged within 1~5 h after feeding on the poisonous leaves. The poisoned larvae experienced such symptoms as stopping ingestion, remaining still, vomiting slightly and body atrophy sequentially, and died ultimately.

食下毒力试验结果经Pearson拟合度检验表明，氯虫苯甲酰胺对3龄起蚕的食下致死中浓度(LC50)为4.0905×10^(-3)mg/L，致死中量(LD50)为1.1435×10^(-8)mg/头；药剂在常规浓度下对家蚕无熏蒸毒性；1.25×10^(-4)mg/L稀释药液对桑树根灌和喷叶处理，表现极强的根部、叶部和全株性内吸传导特性；药液对家蚕的残毒期很长，1.25×10^(-4)mg/L稀释药液田间喷雾桑叶，间隔60 d后采叶饲喂3龄和5龄蚕的死亡率均为100%，且中毒反应极快，添食毒叶后1~5 h出现中毒症状，经停止食桑、静伏、少量吐液、蚕体萎缩等过程后陆续死亡。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。