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In order to investigate the relationship between ammonia in the sediment and the physiological and biochemical characteristics of macrophytes, Vallisneria natans L and Elodea nuttallii were planted in the sediments of seven different concentrations of ammonia.

和伊乐藻Elodea nuttallii两种沉水植物的植株鲜物质量的变化、干物质量、根系的活力、过氧化物酶和过氧化氢酶活性，以期明确这两种沉水植物与水体底质浓度之间的关系。

Propagules and buds of Elodea nuttallii and Potamogeton crispus were exposed to acetic acid concentrations from 1 to 16 mmol/L for 3 or 6 days, and then they were subsequently cultured in absence of acetic acid. Results showed P. crispus was more tolerant to acetic acid than E. nuttallii. At acetic acid concentration of 1 mmol/L, E.

研究了暴露于不同浓度的乙酸溶液后伊乐藻和菹草无性繁殖体的萌发和幼芽的生长状况。1mmol/L的乙酸能显著抑制伊乐藻幼芽的生长(P.05)，但对其繁殖体的萌发无明显影响。

Fresh weight, dry weight, root activity, peroxides activity and catalase activity were measured. The results showed that FW, DW, root activity, POD activity and CAT activity of Vallisneria natans L and Elodea nuttallii were improved when ammonia concentrations were less than 50mgkg^(-1) and 500mgkg^(-1), respectively.

试验结果表明，氨氮起始质量分数＜50mgkg^(-1)和＜500mgkg^(-1)时可以分别促进苦草和伊乐藻鲜物质量、干物质量和根系活力的增加，大于此范围则会抑制苦草为Vallisneria natans L和伊乐藻Elodea nuttallii的生长。

The results showed that FW, DW, root activity, POD activity and CAT activity of Vallisneria natans L and Elodea nuttallii were improved when ammonia concentrations were less than 50mg?kg^(-1) and 500mg?kg^(-1), respectively.

kg^(-1)和＜500mg？kg^(-1)时可以分别促进苦草和伊乐藻鲜物质量、干物质量和根系活力的增加，大于此范围则会抑制苦草为Vallisneria natans L和伊乐藻Elodea nuttallii的生长。

Concentrations of heavy metals in the suspended matter and sediment are not obviously affected by elutriation of stream and dilution of tributary stream. This feacture does not change even in the distant reach downstream. Therefore, the suspended matter and sediment are the potential source of heavy metal contamination to the waters for industry and agriculture use.

河流的地质、水文特征决定了河流悬浮物和沉积物成为河流中重金属搬运迁移的主要载体，在几十公里的下游水域中悬浮物和沉积物中重金属含量没有受到其它支流清澈水体的稀释，成为下游工、农业用水的潜在污染源。

HCV1. Forest areas containing globally, regionally or nationally significant concentrations of biodiversity values (e.g. endemism, endangered species, refugia).

第一类：具有全球、区域、或国家级保护意义的生物多样性价值（如：地方特有种、濒危种、残遗种等）显著富集的森林区域。

The test results show that through the adoption of foreign origin ET-1 incentives cell secretion NO, ANP and AII ET-1 concentrations increase with the volume of the increase, and the role of the endodermis cells are promoting multiplication, a concentration dependence.

试验结果表明，通过外源性的ET-1的刺激，细胞产生NOS、ANP和AⅡ的量随ET-1浓度的增加而增加，并且对内皮细胞有促增殖作用，呈浓度依赖性。

Methods Eukaryotic expression plasmid pCMVCD was constructed , and identified by re2 striction endoenzyme digestion. CD gene was transfected into NSCs from new2born Wistar rats using Lipofec2tamine2000. Positive clones (named NSCs/ CD cells) were screened by G418 presence. 52Fluorocytosine (52FC) ad2ministration of different concentrations were incubated with NSCs/ CD cells. NSCs/ CD cells viability ratios were mea2 sured by MTT assay.

通过构建真核表达质粒pCMVCD ，限制性内切酶消化鉴定后，采用Lipofectamine 2000 脂质体介导法转染新生大鼠室管膜下区神经干细胞(Neural stemcells ， NSCs)，G418 筛选阳性克隆，加入不同浓度的52氟胞嘧啶(52Flourocytosine ， 52FC)，MTT比色法测定NSCs的生存率。

This energy is transmitted through space in the form of bundles or concentrations of energy.

这种能量是以能束或能流的形式，通过空间传递的。

Results All the NQs can activate the calcium release channel to some entent and induce Ca2+ transportation.The modulations of 1,4 NQ,1,2 NQ,1,4 NQ2S and 1,2 N are biphasic and depend on their concentrations.The mechanism of gating modulation depends on oxidation and reduction of NQ.The by-products of NQ during oxidation and reduction do not interact with RyR.

结果 所有NQ都不同程度地激活钙通道引起钙流释放；1，4NQ、1，2NQ、1，2NQ、1，4NQ 2S和1，2NQ4S对RyR的调节表现出强烈的浓度依赖性的双相作用性；NQ通过氧化还原作用调控RyR的门控机制；NQ在氧化还原循环中产生的超氧等伴生物没有参与RyR的相互作用。

These are places without aristocratic baggage; egalitarian places open to talent, self-improving, engaged in learning and innovation through networks that were at once competitive and cooperative.

这些地方没有贵族遗风作祟，而且对于那些有天分的人是开放的平等之地，这些人善于通过那些曾经很具有竞争力与合作精神的关系网进行自我提高以及学习创新。

Christine: You don't want to see me?

你不想见我？