The results showed that the minimal lethal dose of Norfloxacin to embryos is 320mg/ kg embryo weight, and the lethal dose 50% ( LD60) for 3-day-old chicks 4 985+ 753.18 tag/ kg body weight.

Methods: To carry out external bacteriostasis experiment first by the method of drilling hole, then To definite minimal lethal dose by preliminary test, finally to do internal bacteriostasis experiment with mice.

方法：先采用打孔法进行体外抑菌试验，然后通过预试验找到最小致死浓度，最后用小白鼠进行体内抑菌试验。

Protection mechanism of mice transferred by AAV 2-BPI_ ( 700)-Fc γ 1_ ( 700) recombinant virus to minimal lethal dose E.coli infection

AAV2-BPI（700）-Fcγ1（700）重组病毒导入小鼠对致死量大肠埃希菌感染的保护作用机制

Objective To observe the resistance of mice that were transfected with BPI_700-Fc γ 1_700 chimera gene to minimal lethal dose ( MLD) of E.

目的通过观测BPI700-Fcγ1700嵌合基因导入小鼠对最小致死量E。

Clostridium welchii isolated from intestine contents of normal and sudden death black goats is preliminarily studied by cultural performance and biochemical reaction, determination of hemolytic activity, minimum lethal dose and neutralization test of toxins.

通过分离纯化、培养特性和生化反应的观察、毒素溶血活性和最小致死量的测定及中和试验对正常和猝死黑山羊肠内容物中的魏氏梭菌进行了初步研究。

Metho ds: Mice acute toxicity test ( median lethal dose, minimum lethal dose, maximum tolerance dose);

方法：小鼠急性毒性实验（半数致死量、最小致死量、最大耐受量）；

The absolute lethal dose for cats after intraperitoneal injection is 300mg/ kg.

猫腹胜注射的绝对致死量为300mg/kg。

The results of dominant lethal test showed no statistical difference in the number of living, dead and resorbed fetuses between the exposed and the negative control groups.

显性致死实验结果表明各剂量组的受孕率、死胎和吸收胎数经统计学处理与阴性对照组无差异。

Methods The dominant lethal test and the sperm abnormalities test were used to study the reproductive and developmental toxicities of MeHg on male mice.

方法：采用显性致死试验和精子畸变试验的方法研究不同剂量甲基汞对小鼠生殖发育的影响。

Dominant lethal test with pyronaridine on male mice

咯萘啶对雄性小鼠的显性致死试验

Comparative study of Kunming and BALB/ c strain mice for dominant lethal test

昆明系和Balb/C系小鼠用于显性致死试验的比较研究

Results: Dominant lethal test was positive.

结果：显性致死试验阳性；

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

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

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

半致死浓度Lc50与pH和水的硬度成反比。

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

低温预处理可以诱导对致死浓度H2O2的抗性。

A SAS program to calculate median lethal dosage ( LD_ ( 50)) of pesticides, named LD50-SAS, was developed based on the algorithms established by Bliss.

基于Bliss概率单位法，编写了用于计算半数致死量（LD50）的SAS程序（LD50-SAS）。

No significant effect on mice was observed in dominant lethal assay.

吡啶酸铬对小鼠的显性致死试验结果为阴性；

With 1,5 and 7 krad of irradiation, a mutant of P.interpunctella with transparent wings was induced, which provides a marking feature in control of Indian meal moth by sex chain recessive lethal gene.

5、7krad辐照的，诱导出了成虫翅透明的突变品系（透明型）。该突变品系对研究印度谷螟的部分遗传学及遗传防治有重要意义。

Objective: To investigate the effect of the sublethal X irradiation ( XI) on antioxidation in adriamycin induced nephropathy ( AIN) of Wistar rats.

目的：研究次致死量X线照射对阿霉素肾病（AIN）大鼠抗氧化功能的影响。

91-mixture accelerates recovery of immune function following sublethal irradiation

91合剂加速放射损伤小鼠免疫功能的恢复

Objective To construct an attenuated Salmonella typhimurium vaccine strain expressing the gene EspA of EHEC O157: H7 with balanced lethal system.

目的利用平衡致死系统构建表达O157：H7EspA的减毒鼠伤寒沙门氏菌。