致死性

The result showed that the best is Coreopsis drummondii, its semi-lethal concentration and limit concentration both reached as high as 1.4%; The next was Callistephus chinensis, its semi-lethal concentration was 0.6%, and its limit concentration was 1.2%; The middle was Althaea rosea, its semi-lethal concentration was 0.4%, and its limit concentration was 1.2%; The lower one was Rudbeckia hirta, its semi-lethal concentration was 0.4%, and its limit concentration was 1.0%.

结果表明：耐盐性最强的是金鸡菊，其耐盐半致死浓度和耐盐极限浓度高达1.4%；其次为翠菊，耐盐半致死浓度为0.6%，耐盐极限浓度为1.2%；耐盐力中等的是蜀葵，其耐盐半致死浓度为0.4%，耐盐极限浓度为1.2%；耐盐性最差的是黑心菊，耐盐半致死浓度为0.4%，耐盐极限浓度为1.0%。

The time and frequency of the polecat searching different preys and burrows were nearly the same. The polecat attacked virtually all prey offered and thus exhibited opportunistic foraging behaviour. However, it did not captured all prey with equal sequence. It first captured the zokor, then the pika and last for the root vole. In addition to using the typical musteline killing method of biting the nape of the neck, the polecat evolved a variety of killing methods suited to a range of prey types depending on the activity, size and anti-predation ability of prey. The zokor was bitten on the head, whereas the pika was killed by bites to the head or throat and the root vole was killed by bites to the head or chest. The time polecats pursued the root vole was the longest, followed by that used in pursuing the pika and the zokor.

实验结果表明：艾虎对三种猎物的搜寻时间和搜寻频次基本一致，在搜寻猎物的过程中并非已知洞道系统中所存在的食物信息，是一种机会主义的捕食者；艾虎除了具有典型鼬科动物捕杀猎物的方法外，能够根据猎物的大小、活动性和反捕食能力采用不同的捕杀方法，在捕杀猎物的过程中首先捕杀高原鼢鼠，其致死部位全部为头部，其次捕杀高原鼠兔，其致死部位除了头部外，明显增加了颈部的比例，最后捕杀根田鼠，其致死部位主要是头部和胸部；艾虎在捕杀猎物的过程中，追击根田鼠的时间最多，追击鼢鼠的时间最少，而用于捕杀根田鼠的时间最少，用于捕杀鼢鼠的时间最多，艾虎捕杀高原鼠兔后单位时间内获得的能量值最大，其次为捕杀高原鼢鼠，而捕杀根田鼠后单位时间内活动的能量值最小。

The tolerance of seawater fish Japanese sea bass and black rockf ishto pH and alkalinity is studied through the experiment of acute toxicity. The median lethal concentration values are obtained by the method of probability unit. The safe concentrations of alkalinity, C032- and HC03- are obtained. The signification of pH and alkalinity is estimated with analysis of variance.

本文应用急性毒性试验方法研究了海水鱼类鲈鱼黑鲪对pH、碱度、二氧化碳体系各分量的耐受性，应用概率单位法求得半致死浓度，并得到了碱度、碳酸根、碳酸氢根等的安全浓度，应用方差分析评价了pH和碱度致毒作用的显著性，探讨了不同pH、碱度范围的主要致死因子。

Results:Biochemical indicators: the concentrations of K+, Na+ and Cl－ in the serum after the infusion are different with those before the infusion; other indicators don't have the significant difference. The mean infusion time of group A is longer than that of group B (p=0.006), while the dosis letalis of KCl doesn't have significant difference between groups (p=0.062); the concentrations of K+ in blood, Na+, Mg2+ and Cl－ in serum have the significant difference between groups; the urine volume and the concentrations of all the urine electrolyte indicators don't have the statistical significant difference between groups.

结果：生化指标：输入钾前后，家兔血清钾离子浓度升高，钠、钙及氯离子浓度降低，具有统计学显著性差异，p=0.000；全血钾及血清其他离子浓度变化，以p=0.05为标准，不具有统计学显著性差异。A、B两组间比较结果：A组输液致死时间长于B组(p=0.006)，致死输钾量无统计学显著性差异(p=0.062)；全血钾、血清钠、镁及氯离子浓度变化值具有显著差异，血清钾、钙、碳酸氢根离子浓度变化值无明显的差异；尿量和尿液各电解质浓度指标无统计学显著性差异。

There are experimental results as follows:(1) Eriophorum comosum Nees shows strong cold resistance in plasmalemma permeability research. The lethal temperature of Eriophorum comosum Nees is the lowest LT_(50 in comparison with another two plants and is lower than -11.5℃ in August 2005 and December 2005; Soluble protein content of each plant is rising before or after cold hardiness. By SDS-PAGE, Protein band is analysed. Band quantity of Eriophorum comosum Nees is the most and its band color is darkest.(2) Soluble sugar content of three plants after cold hardiness are higher than before cold hardiness, moreover soluble sugar content after cold hardiness shows a decline and there is a narrow range in Eriophorum comosum Nees; Free Proline accumulation is changed by cold stress, and cold resistance is relative to free Proline accumulation; chlorophyll content of both three plants, including chlorophyll a, chlorophyll b and chlorophyll a/b, show a decline tendency along with the descent of temperature. Cynodon dactylon is highly sensitive to cold stress.(3) The soil POD and urease activities' absolute value of Erioophorum comosum Nees and Pogonatherum panideumHack were more than that of Cynodon dactylon before or after low temperature stress, especially POD activities.

实验结果表明：(1)在膜透性的研究中，丛毛羊胡子草抗寒性最强，采用电导率法测得半致死温度LT_(50最低，丛毛羊胡子草抗寒锻炼前后半致死温度LT_(50均小于-11.5℃；在可溶性蛋白含量研究中，抗寒锻炼前后三种植物的可溶性蛋白含量均增加，同时采用SDS-PAGE法，通过对蛋白条带分析，以丛毛羊胡子草条带数最多且着色深；(2)在可溶性糖的研究中，三种植物经抗寒锻炼后叶片可溶性糖含量都比抗寒锻炼前高，且经过抗寒锻炼后三种植物可溶性糖均呈下降趋势，丛毛羊胡子草可溶性糖含量下降较小；从游离脯氨酸含量可知，低温的胁迫影响了植物叶片游离脯氨酸的含量变化，植物的抗寒性与游离脯氨酸有关；低温胁迫下三种植物叶绿素含量随着温度的下降，叶绿素含量、叶绿素a、叶绿素b和叶绿素a／b均呈下降趋势，狗牙根对低温胁迫最为敏感；(3)低温锻炼前后，丛毛羊胡子草和金发草的土壤过氧化物酶与脲酶活性的绝对值均大于狗牙根的，特别是过氧化物酶，说明丛毛羊胡子草和金发草的酶活性大于狗牙根的。

Goose Provirus is the pathogen of highly contagious and fatal infectious diseases of goslings and Muscovy ducklings.

鹅细小病毒(Goose Provirus，GPV)可引起雏鹅、雏番鸭高度致死性传染病—小鹅瘟。

That new direction is "synthetic lethality" via the inhibition of poly(adenosine diphosphate –ribose) polymerases, or PARPs.

这个新方向就是通过抑制多聚聚合酶或PARP 的&合成致死性&。

Issues at the fore will include the avoidance of hypoglycaemic episodes and associated fatal myocardial infarctions, ways to optimally integrate glycaemic control within a comprehensive cardiovascular risk reduction strategy, and opportunities for adapting therapy to address the moving pathophysiology of disease progression.

前述内容将包括避免低血糖事件和相关的致死性心肌梗塞，兼顾血糖控制与减少心血管风险综合措施的最佳方法以及调整治疗应对疾病病理生理学进展的时机。

The incubation period is generally six months to 8-10 years. There are more than 40 million HIV-infected people.

艾滋病是由于感染了人类免疫缺陷病毒后引起的一种致死性传染病，它的潜伏期一般为6个月至8~10年。

Apo E is a key player in the deadly transformation of amyloid.

载脂蛋白E在淀粉状蛋白的致死性转变中起着重要的作用。

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。