致死浓度

低温预处理可以诱导对致死浓度H2O2的抗性。

Pretreatment of low temperature could induce resistance to lethal concentration of H2O2 .

半致死浓度Lc50与pH和水的硬度成反比。

The lethal concentration is inversely proportional to pH and water hardness .

结果表明，苜蓿愈伤组织经DES处理，DES的半致死浓度为03%，愈伤组织的抗寒性增强。

The DES concentration resulting in 50 % death was 0.3 % , and the cold resistance of alfalfa callus was increased .

结果发现沙棘籽渣黄酮类化合物对Bcap-37细胞有明显的增殖抑制作用，抑制率呈明显的剂量&效应关系，半致死浓度（IC（50））为600μg/ml。

The results showed a dose-dependent effect of proliferation inhibition in Bcap-37 cells , IC_ ( 50 ) was 600 μ g / ml.

M3代，重复性鉴定的结果表明，变异材料对致死浓度的草甘膦仍具有忍耐力，这为抗除草剂油菜品种的培育提供新材料。

Evaluation of glyphosate with carious concentrations in M3 showed that the mutation materials were also resistant to herbicide , and provide new materials for herbicide-resistant variety breeding .

致病性研究表明水温20℃时，该菌对牙鲆（平均体重10g）3天的半致死浓度LD（50）为2.O×10~8CFU／mL。

Infection test showed that 3-day LDso of the pathogen to Japanese flounder , Paralichthys olivaceus ( with mean weight : 10 g ) was 2.0 108 CFU / mL.

利用透射电镜研究了亚致死浓度的Cu2+或表面活性剂AE（脂肪醇聚氧乙烯醚）对黄鳝肝细胞结构的损伤作用。

The ultra-structural changes of Monopterus albus liver cells were observed with transmission electron microscopy after sublethal exposure to Cu2 + and nonionic surfactant AE ( linear alkylethoxylate ) .

方法采用浸渍法，测定Ⅳ龄期幼虫的半数致死浓度（LC50）。

Methods Immersion method of pesticide was used to assay the medium lethal concentration ( LC_ 50 ) of the fourth-instar larvae .

各提取液的半致死浓度（LC50）随着藤壶无节幼体在各提取液中的暴露时间的延长越来越低，但下降幅度存在一定差异性。

With the prolonging of exposed time , LC50 of the extracts were getting lower and lower , but changing ranges were different .

半致死浓度（LC50）池水温度较低，一年中有半年冰封期。

Lethal concentration ( LC50 ) The water in the lake is comparatively cold and the lake remains frozen half of the time each year .

通过对半致死浓度的比较，研究了各鱼种对不同重金属离子的敏感程度，某种重金属对某种鱼的24h-LC50值越小说明该鱼种对这种重金属的敏感性越强。

Through the comparison of 24h-LC50 , the sensitivity of different fishes to heavy metals was studied .

MCF-7/MDRa细胞较亲本细胞的ADM半数致死浓度（IC50）高500倍，撤药培养150天后耐药倍数仍维持在200倍以上。

The IC50 of MCF-7 / MDRa to ADM was 500 times higher than that of original cell MCF-7 , and the resistance Factor still remains 200 above after MCF-7 / MDRa was cultivated in blank medium .

通过实验测出活性成分和抽出物在盐水培养基中的中央致死浓度LC50（μg／ml），结果表明马尾松抽出物对盐水虾幼体具致死活性。

Through the experiment , the LC 50 values (μ g / ml ) of active components and extracts in the brine medium have been determined and the results reveal that the extracts of Pinus massoniana possess the lethal activity on the shrimp larvae .

目的明确光气急性中毒的剂量-反应关系与其半数致死浓度（LC50），建立光气中毒肺水肿动物模型，为进一步研究光气损伤机制及防治手段奠定基础。

Objective To determine dose-response relationship of phosgene poisoning and establish pulmonary edema animal model , so as to provide basis for further study on lung injury and treatment of phosgene .

采用Wistar大鼠进行急性经呼吸道半数致死浓度（LC50）试验（急性吸入染毒2h），并进行了亚急性吸入毒性试验和遗传毒性试验（14、28d）。

Wistar rats were used to determine the LC50 of p-dichlorobenzene by acute aspiration intake ( 2 h ), subacute toxicity test and genotoxicity test had been done through inspiration ( exposed for 14 d and 28 d ) .

以锦鲤鱼（BrocardedCarp）为试验生物，将其暴露于3种化合物不同浓度的试液中，通过鱼类的死亡率求出96h半数致死浓度（LC50）。

In the test , Brocarded Carp was chosen as test animal and was exposed to different doses of the three nitrobenzene compounds , and 96 h LC50 was calculated according to lethal rates of the fish .

方法：选择分别含甲苯与丁酮、甲苯及酯类的鞋胶，通过急性吸入毒性实验的方法，观察不同成分鞋胶对小白鼠的半数致死浓度（LC50）及毒性作用表现。

METHODS To test the acute inhaling toxicity of different ingredient shoe mucilages ( including toluene and ketone , only toluene and only ester ) and observe the LC 50 and the toxic effect on rats .

采用标准实验方法测定了21种硝基苯类化合物对隆线蚤（Daphniacarinata）的48h半致死浓度值，结果lg（1/LC50）的范围在349～540之间；

The half lethal concentration of 48 ? h-LC_ ( 50 ) of 21 nitrobenzenes to Daphnia carinata was determined by use of the standard test method , and the range of toxicity was from 3.49 for nitrobenzene to 5.40 for 1,4-dinitrobenzene .

将罗非鱼分别置于含有1、4、8、12ppmZnSO4的软、硬质水中，研究15d中不同亚致死浓度Zn~（2+）对鱼呼吸和咳嗽反应频率的影响；

Fish were exposed to either soft water or hard water containing 1,4,8 and 12 ppm ZnSO_4.The sublethal effects of Zn ~ ( 2 + ) on respiration and cough frequencies were studied over a period of 15 days .

采用Bliss法，计算其死亡率和昏迷率的加权直线回归方程，并获得其经救治后血液半数致死浓度LC50、半数致昏迷浓度CC50。

The probabilities of death , coma were analyzed with Bliss method and their linear regressive equations of probit were obtained respectively , their 50 % lethal concentrations ( LC50 ) and 50 % coma concentrations ( CC50 ) were calculated by the formulas above .

为今后的生物监测提供可靠的半致死浓度的数据。

The median lethal concentration data is reliable for future biological observation .

七种药物对微小牛蜱的半数致死浓度测定

Determination of median lethal concentration of seven kinds of medicines against Boophilus microplus

链霉菌702生物活性物质抑菌的致死浓度和致死时间的测定

Test on Bacteriostatic Lethal Concentration and Time of Bio active Compound Produced by Streptomyces 702

左旋咪唑对华支睾吸虫最低致死浓度为三苯双脒的50倍；

The minimal concentration of levamisole used to kill adult worm is50 times higher than that of tribendimidine .

在鱼鳔形成期半致死浓度最高，在此时期抵抗力最高。

While during swimming baldder formation , the semi-lethal concentration is maximum and the resistance is highest . 3 .

抗生素对栉孔扇贝面盘幼虫半致死浓度的初步试验

Preliminary Test on the Effect of Antibiotic on the Lethal Concentration 50 % of Veliger Larva of Chlamys farreri

结果：（1）半数致死浓度LC50：0.00167514%（0.00180113%～0.00155798%）；

Results : ( 1 ) The LC 50 of Cyhalothrin is 0.00167514 % ( 0.00180113 % - 0.00155798 % );

浓度梯度按等对数间距设置，半致死浓度采用直线内插法进行计算。

The grades were designed by equal space between logarithm , and the median lethal concentration was computed by Linear Regression .

结果：替硝唑栓体外对阴道毛滴虫最小致死浓度为3.72±1.24μg/ml；

RESULTS : The minimum fatal dose of tinidazole suppository for 33 strains of trichomonad was 3.72 ± 1.24 μ g / ml ;

目的探讨致死浓度氧（95%）与新生鼠肺发育及损伤的关系，建立支气管肺发育不良动物模型。

Objective To study the effect of oxygen at lethal levels ( 95 % ) on pulmonary development and lung injury in neonatal rats and establish rat models of bronchopulmonary dysplasia .