甲基

The overburdening knowledge that thimerosal is converted to ethyl mercury (a substance over a thousand times more destructive than inorganic mercury) in less than one minute after being introduced into the body should give great concern to those appointed to protect the public.

钗h的报告显示thimerosal进入体内一分钟内会转变成甲基汞(甲基汞的破坏性是无机汞的一千倍)，这个事实应该引起更多关注以保护大众的健康。

When there were two kinds of active sites with different properties, isobutene were formed on one kind of active site, and then, spilled over to the other active sites, reacting to MAL, isobutene forming as the final product was restrained, and the oxygenates yield was increased.

当催化剂表面存在相邻的两种化学性质不同活性位时，异丁烷在一种活性位上生成异丁烯后，异丁烯可能在催化剂表面迁移到另一种活性位上，继续反应生成甲基丙烯醛或甲基丙烯酸，这抑制了异丁烯作为产物从反应器中流出，并提高含氧有机物收率。

After superfusing the brain slice with guanylate cyclase inhibitor,MB(3 pmol/L) for 30 min,SDR of 10 units showed significant increase as compared with control. However,MB failed to abolish the effect of L-arg on hippocampal neurons.

3给脑片灌流鸟昔酸环化酶抑制剂亚甲基蓝(3umol/L 30 min后，10个单位的平均放电频率较对照时明显增加，但亚甲基蓝不能消除L-arg对海马神经元的作用。

Then in another tower, of which the height was 1.6m and the inner diameter was 20mm, the pentanol mixture was exactly rectified. The influence factors on separation effect, for example, the material concentration, evaporation velocity, circumfluence rate.etc, were studied and a set of separation system about salt-out -exactitude rectify was upbuilt. The result showed: when the material concentration was 60%, we got our product, 2-methyl-1-butanol, with the concentration over 99% and the top quality recovery over 82.7% which would increase as the material concentration did.

在高1.6m，内径为20rnm的精馏塔内，对戊醇混合物进行精密精馏，研究了原料浓度、蒸发速率、回流比等因素对分离效果的影响，建立了一套盐析-精密精馏的分离体系，结果表明：原料中2-甲基-1-丁醇浓度60％时，得到的2-甲基-1-丁醇产品浓度在99％以上，最高收率达82.7％以上，且随着原料浓度的增加而进一步增大。

There is less reports that are vended for the synthetic technology of tin methylsulfonate in the country.

为此本文对以甲基磺酸和单质锡为主要原料，采用置换法直接制备甲基磺酸亚锡的新工艺进行了较为系统的研究。

RT-PCR was used to detect the mRNA expression of p16 and MGMT before and after treatment with 5-Aza-dC, respectively. Results: Promoter hypermethylation of the p16 and MGMT gene were detected in MGC-803 cells, and p16 and MGMT were absent before treatment.

应用5-Aza-dC处理体外培养的胃癌细胞MGC-803后，甲基化特异性PCR法检测用药前后细胞中p16和MGMT基因的甲基化状态，RT-PCR法检测用药前后细胞中p16和MGMT mRNA表达的变化。

Whenthe dosage of modified humic acid was 0.8g,its removal rate on methyl violet was 98.34%.At 25℃,the effect of fitting the adsorption of modified humic acid to methyl violet by Frendlich equation was best.

当改性腐殖酸的用量为0.8g时，其对甲基紫的去除率达98.34%。25℃下，改性腐殖酸对甲基紫的吸附用Frendlich方程拟合效果最佳。

In general, they are synthesized by using chemistry oxidant to oxidize methyl group of aromatic compound into the aldehyde group.

其生产方法一般采用化学氧化剂氧化甲基化合物的方法，即采用化学氧化剂氧化甲基化合物得到芳香族醛类。

The 1,3-2,4-di (3,4-dimethylbenzy-lidene) xylitol was synthesized by means of aldol condensation reaction with xylitol and (3,4-dimethyl) benzaldehyde as raw materials and paratoluenesulfonic acid as catalyst.

以木糖醇和3，4-二甲基苯甲醛为原料，在酸催化下进行醇醛缩合反应，合成了1，3-2，4-二（3，4-二甲基）苄叉木糖醇。

But very little literature concentrated on the activated methyl which closes to the carbonyl of enaminones. So the paper conducts the research to the aldol condensation of aromatic aldehydes with the activated methyl of enaminone.

但却很少有文献对烯胺酮类化合物的羰基α位活泼甲基进行研究，因此本论文对烯胺酮羰基α位活泼的甲基与芳香醛发生缩合反应进行了研究。

Now, however, all children continue in "comprehensive" schools, and the eleven-plus determines which courses of study the child will follow.

然而现在，所有的孩子都要在综合学校继续学习，所以这次考试只是决定他们将要学习哪些课程。

Cultivatable land , and led to a general recognition that development must not be carried at the cost of agriculture .

城区的迅速扩大在很多情况下侵占了宝贵的可耕地，使人们普遍认识到发展不能以牺牲农业为代价。