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After 48h of exposure, the color of leaf of Egeria najas became greenish badly and the leaf was conglutinated, and the chlorophyll content of leaf declined significantly when the Hg concentration were above 2.00mg/L.By the changes of chlorophyll content, the lethal concentration of Hg to Egeria najas was 0.10-2.00mg/L.

处理48h以后，Hg~(2 )浓度人于1.00mg/L实验组中的叶片褪绿严重而且叶片相互粘连，叶片叶绿素含量明显低于对照组，从中可以粗略看出Hg(2-)对细叶蜈蚣草的致死浓度为0.10-2.00mg/L。

Through calculating it is discovered that there is elastic strain energy concentration near triple junction when loading direction is parallel with triple junction, but the concentration degree is not so high.

因为应变能中包含了所有的应力分量和应变分量，能全面地反映各应力分量对三晶交点应力集中程度的影响。

If the concentration of MnSO4 in the medium was 300 mg/L, Geobacillus caldoxylosilyticus N6 could produce endospore after inoculating 1 day. And when concentration of MnSO4 was between 25 mg/L~600 mg/L, equally substantial amount of spore would be formed in three days after inoculation.

若在菌株培养的过程中，希望一天即可得到胞子，则环境中最佳的MnSO4浓度为300 mg/L；而当MnSO4浓度为25 mg/L~600 mg/L时，不论何种浓度，培养三天皆可获得大量胞子。

The bioactive screening on aldose reductase, nitric oxide synthetase, liver cancer Bel-7402, cavum oris epithelioma KB and colon cancer HCT-8 showed that paeoniflorin inhibited the nitric oxide synthetase by the rate of 83. 4% at the concentration of 5μg/ml, and paeoniflorigenone inhibited the colon cancer HCT-8 cells by the rate of 83. 2% at the concentration of 5μg/ml.

通过醛糖还原酶、NO合酶、肝癌Bel-7402、口腔上皮癌KB以及结肠癌HCT-8五种模型的生物活性筛选表明，在51μg／ml的浓度下，芍药甙对NO合酶的抑制率达83.4％，芍药甙元对结肠癌HCT-8细胞株的抑制率达83.2％，有较好的抑制作用。

At same time, effects of temperature on organic contaminant creating in pore water and the equilibrium concentration were also significant, and at low temperature, the equilibrium concentration is low.

同时，环境温度显著影响底泥间隙水有机污染物的平衡，在温度较低时，间隙水有机污染物所能达到的平衡浓度较低，达到平衡所需时间较长。

Adsorption behavior of NB showed that the relationship between the adsorption amount of NB on the soil particles and the equilibrium concentration in solution was well linear within the concentration ranging from 0 to 25 mg/L.

2硝基苯在土壤粒子上的吸附实验表明：在0-25 mg/L浓度范围内，硝基苯在土壤粒子上的吸附量与溶液中平衡浓度之间存在较好的线性关系，表明硝基苯在土壤中的吸附机理以分配作用为主。

F temperature on organic contaminant creating in pore water and the equilibrium concentration were also significant, and at low temperature, the equilibrium concentration is low.

同时，环境温度显著影响底泥间隙水有机污染物的平衡，在温度较低时，间隙水有机污染物所能达到的平衡浓度较低，达到平衡所需时间较长。

Generally, we calculate the concentration of persistent organic pollutants, which is very low in the water by the concentration of organism or sediment under equilibrium condition.

通常，水体中极低含量的持久性有机污染物的浓度可以用平衡条件下的生物体内或沉积物中的污染物浓度来推算，即应用生物监测或沉积物分析方法。

Compared with xylitol, erythritol in low concentration has weaker effort on the growth and acid production of S.mutans, while having stronger effort in high concentration.

对比木糖醇，低浓度下赤藓糖醇对变异链球菌生长和产酸的抑制作用较弱，高浓度下赤藓糖醇的抑菌效果更强。

It indicated that the growth and acid production of S.mutans were higer in 0.5%, 1%, 2% erythritol culture medium than in xylitol culture medium at the same concentration, while lower in 8%, 12%, 16% erythritol culture medium than in xylitol culture medium at the same concentration.

在8%、12%、16%浓度下，赤藓糖醇培养基的A值较木糖醇培养基低，pH值较木糖醇培养基高，说明变异链球菌在含8%、12%、16%赤藓糖醇的培养基内的生长和产酸能力明显较相同浓度木糖醇培养基低。

So it was last week in Selma , alabama.

上星期在亚拉巴马州塞尔马市发生的事件也是这样一个转折点。

The group also spearheads various social programs in China.

该组织还带头参与中国的各种社会活动。