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Determination of tartaric acid and maleic acid by high performance liquid chromatography

含有顺丁烯二酸酐与丁二烯或环戊二烯等加成物结构的不饱和聚酯树脂。

A comparative analysis of the epoxidecontent of ENR by IR, 1H-NMR and titrimetric technique had been made.

分别采用了红外光谱、核磁共振(1HNMR)和化学滴定等手段对天然橡胶的环氧化含量进行了表征。

This paper reviews the recent progress on the Chinese syntheic research of marine natural products according to type classifications: marine cyclopeptides, cembranes, cembrenss, cembranolides, quinolone derivativcs, triacetonamine and subergorgic acid analogues.

本文综述中国海洋天然产物合成研究的最新进展，包括海洋环肽、西松烷和西松烷型二萜内酯、喹啉酮衍生物和三丙酮胺以及柳珊瑚酸类似物等。

Result The nested PCR assay was specific and there is no cross-reaction with other parasites, such as Eimeria spp., Cryptosporidium spp., Giardia sp., Toxoplasma sp., Trichuris sp. and cattle ciliate. The assay was able to detect as low as 2.85 × 10^(-2) fg of control positive DNA. The results of detection of clinical samples revealed that the assay was coinciding with microscopic examination.

该套式PCR能特异性地扩增出牛源环孢子虫基因组DNA中相应片段，与艾美耳球虫、隐孢子虫、贾第虫等10种相关原虫基因组DNA无交叉反应；最低能检测到2.85×10^(-2)fg的阳性参照DNA；对临床样品检测结果表明PCR技术检查阳性者显微镜检查都为阳性。

In contrast, citric acid esters, 810 esters, polyester, trimellitic esters, epoxy esters and other non-toxic, durable and comprehensive performance plasticizers better varieties are developed slowly.

相反，柠檬酸酯、810酯、聚酯、偏苯三酸酯、环氧酯等无毒、耐久、综合性能较好的增塑剂品种则发展缓慢。

Tubes and pipes of the foregoing cross-sections may be polished, coated, bent, threaded, drilled, waisted, expanded, cone-shaped or fitted with flanges, collars or rings.

横截 面成上述形状的管可经打磨、涂层、弯曲、成螺纹、钻孔、缩腰、扩张、成锥形或配有凸缘、环或圈等。

N-heterocyclic compounds, such as indole, imidazole, 2-methylimidazole, 2-ethylimidazole, pyrrole and pyrrolidine, could be effectively N-methylated with DMC in the presence of 1-n-butyl-3-methylimidazolium chlorid.

吲哚、咪唑、2-甲基咪唑、2-乙基咪唑、吡咯和四氢吡咯等含氮杂环化合物在氯化1-正丁基-3-甲基咪唑的催化下能被DMC有效地N-甲基化。

Take Fuzhou , this historical cultural city , as an example: According to the space heterogeneity of different dividing areas in the city and the green corridor structure of city (among them the green corridor passes through the other ring to take green, the Tenneco green land and garden green land of center district), the problems of how to draw the cleanness, wet and cold air around the surround into the center of city through the high green forest community which alleviate the tropical island effect and improve air quality and how to build the ecological view system of the city are discussed to make the city ecological view environment play its social role, the city will not develop at the cost of ecological view components , such as nature , history , and at the basis of expurgating, properly, the distillate of design in the history of the city humanity which would be a design language to stretch the nature, history and humanity view environments.

以福州这座历史文化名城为例：根据城市不同分区的空间异质性，贯通城市内的绿廊结构(其中绿廊穿越外环绿带、楔形绿地和中心区园林绿地)等探讨在城市化不断发展的过程中如何将城市周边清洁冷湿的空气经过高绿量的森林群落引入城市内部，缓解热岛效应，改善空气质量；以及如何通过城市的生态景观系统的营造使得城市的生态景观环境能够作为一个系统而充分发挥它的社会职能。通过对一个城市历史的系统解读使得城市化的发展过程不再是以自然、历史、人文等生态景观组成部分的破坏为代价，而是合理地提炼城市人文历史中积淀下来的部分，设计成为这个城市未来生态景观规划中的一个设计语汇，从更宽泛的角度延展这个城市的自然、历史和人文的景观环境。

Owing to energy crisis and increasing expending scale of industry, the government gives more strict standards on saving energy, protecting environment, improving habituating conditions and so on.

由于能源危机和工业生产规模的日益扩大，国家对节能、环护、改善居住条件等问题提出越来越高要求。

With higher encircling scleral buckle,the refractive change after buckling surgery may be caused primarily by the shallowing of anterior chamber and thickening of lens.

在较高眼内环扎嵴时，术眼术后早期晶状体增厚和前房变浅是眼屈光度负值增加的主要因素，其原因与术后虹膜晶状体隔移位等有关。

Singer Leona Lewis and former Led Zeppelin guitarist Jimmy Page emerged as the bus transformed into a grass-covered carnival float, and the pair combined for a rendition of "Whole Lotta Love".

歌手leona刘易斯和前率领的飞艇的吉他手吉米页出现巴士转化为基层所涵盖的嘉年华花车，和一双合并为一移交&整个lotta爱&。

This is Kate, and that's Erin.

这是凯特，那个是爱朗。