甲醛

It is very important to expore the genotoxity of formaldehyde, toxicity mechanism and repair for understanding formaldehyde genotoxicity as well as nosogenesis completely and systematically. In addition, this research will benefit a lot to estimate and improve the indoor air quality by providing scientific foundation and make a safe environmental and occupational concentration standard.

探讨甲醛的遗传毒性，毒性机制等，对全面和系统的了解甲醛的遗传毒性的致癌性，进一步评价和改善室内空气质量具有十分重要的意义，并为制定安全的环境和职业浓度提供更科学的依据。

Binary blends of polyoxymethylene/co-polyamide and ternary blends of poly- oxymethylene/co-polyamide/ethylene-vinyl (POM/COPA/EVA) were prepared and the effect of COPA and EVA contents on properties of blends was investigated.

研究了聚甲醛/共聚酰胺二元及聚甲醛/共聚酰胺/乙烯-醋酸乙烯酯共聚物(POM/COPA/EVA)三元共混物，探讨了COPA、EVA用量对共混体系性能的影响。

The novel methods for the synthesis of Camptothecin intermediates were described as Friedlandle. Second, we synthsized the key compound—BI, and then made some improvements and innovations of the methods from the reference. The method of using more economically phenylaldehyde derivatives and phenylamine derivatives instead of o-aminobenzaldhyde was worked out.

然后成功合成重要的中间体BI，并且在参考原始文献的基础上作出了改进和创新，使用更便宜的苯甲醛衍生物和苯胺衍生物代替了邻氨基苯甲醛，合成了一系列未关B环的喜树碱中间体衍生物，并获得成功。

Four novel methoxycarbonylindole-3-carboxaldehyde phenylhydrazone s were synthesized by the condensation reaction between methoxycarbonylindole-3-carboxaldehyde and phenylhydrazine in acidic condition.

甲氧羰基吲哚-3-甲醛与苯肼在酸性条件下通过缩合反应合成了4个未见文献报道的新化合物甲氧羰基吲哚-3-甲醛苯腙，其结构经1HNMR，IR和MS确证。

Four novel methoxycarbonylindole-3-carboxaldehyde phenylhydrazones were synthesized by the condensation reaction between methoxycarbonylindole-3-carboxaldehyde and phenylhydrazine in acidic condition.

甲氧羰基吲哚-3-甲醛与苯肼在酸性条件下通过缩合反应合成了4个未见文献报道的新化合物甲氧羰基吲哚-3-甲醛苯腙，其结构经1HNMR，IR和MS确证。

Four new compounds,substituted-benzyloxyindole-3-formaldehyde-(4′-nitro) phenylhydrazone ,were synthesized by the condensation of 4-nitrophenylhydrazine with substituted-benzyloxyindole-3-formaldehyde in ethanol.

以取代苄氧基吲哚-3-甲醛和4-硝基苯肼为原料，乙醇为溶剂，通过缩合脱水反应合成了4个新化合物——取代苄氧基吲哚-3-甲醛-(4′-硝基)苯腙，其结构经1H NMR，IR，MS和元素分析表征。

Results The clinical observation of 180 patients with entirely developed root apex of acute and chronic apical periodontitis shown that there was no significant difference comparing erythromycin ethylsuccinate-metronidazole-CP with FC in root canal sterilization, therefore, the irritability and poisonousness of the paste can be reduced by using erythromycin ethylsuccinate-metronidazole-CP instead of FC.

为了清除髓腔病源刺激物，促进根尖病变愈合，目前国内大多用甲醛甲酚进行根管消毒。甲醛甲酚属化学制剂，虽具有强烈的杀菌作用，但亦具有刺激性、毒性和抗原性等，而琥珀酸红霉素和甲硝唑在临床上已被证明对厌氧菌有明显疗效，对于根管内的消毒杀菌作用如何，研究报道不多。

The stereochemical structures of two new compounds, 5-(3-chlorophenyl)-2-furfur-aldehyde-N-4-methylphenyloxyacetylhydrazone and 5-(3-chlorophenyl)-2-furfuraldehyde-N-4-nitrophenyloxyacetylhydrazone, were determined by DPFGSE-NOE experiments performed in DMSO-d\-6 at 25 ℃ and variable-temperature ~1H NMR The ~1H chemical shifts of the compounds were completely assigned at 25 ℃ and 90

利用变温实验和DPFGSE NOE实验，确定了 5 (3 氯苯基) 2 呋喃甲醛 N 4 甲基苯氧乙酰腙和5 (3 氯苯基) 2 呋喃甲醛 N 4 硝基苯氧乙酰腙两个新化合物25 ℃时在二甲基亚砜中的空间构型，并对这两个新化合物在 25 ℃和 90 ℃时的质子的化学位移进行了全归属。

First, 4-(2, 3-epoxypropoxyl) benzaldehyde was obtained by reaction of 4-hydroxy benzaldehyde and epichlorohydrin. Then, the Wittig reaction was carried out to convert EBD to styryl glycidyl ether.

首先用对羟基苯甲醛和环氧氯丙烷反应制备4-(2， 3-环氧丙氧基)苯甲醛，然后通过Wittig反应将醛基转化为乙烯基得到含环氧基团的功能性单体苯乙烯基环氧丙基醚，最后用ATRP方法聚合单体SGE得到含环氧侧基的聚苯乙烯。

Sodium formaldehyde sulfoxylate can break down into formaldehyde and sulfur dioxide in process of using.

吊白块在使用过程中会分解出甲醛和二氧化硫，先用乙酸铅试纸法[1]对样品进行定性筛选，可疑样品再用分光光度法[2]测量甲醛的含量，判断是否含有吊白块。

But we don't care about Battlegrounds.

但我们并不在乎沙场中的显露。

Ah! don't mention it, the butcher's shop is a horror.

啊！不用提了。提到肉，真是糟透了。