化学合成

After cropping, use of additives or synthetic chemical substances is not allowed for the processing of organic agricultural products, nor is radiation or use of fumigants allowed.

有机农产品收获后处理不允许添加或使用合成化学物质，也不允许以辐射或熏蒸剂处理。

Surface active agent is applied widely in oil and gas engineer on the basis of literatures. For chemical treating agents, a most significant direction in studying and development is to synthesize every kind of existed surface active agents and to research modifiedly in order to enlarge its application in oil and gas engineer.

表面活性剂广泛应用于石油天然气工程，对表面活性剂进行合成、改性研究以扩大其应用范围是石油天然气工程化学处理剂研究发展的一个重要方向。

RESULTS AND CONCLUSION: Osteoblast was fusiformed-shaped and had plentiful processes. Nucleus was orbicular-ovate and leaning to lateral side. Soma was large, and plasma was abundant. Alkaline phosphatase staining suggested that a great number of gray-black particles were observed in plasma, and some region was darkly stained.

结果与结论：成骨细胞呈梭形，多突起；细胞核呈卵圆形，偏于一侧；胞体大，胞浆丰富；碱性磷酸酶染色可见胞浆中含有大量的灰黑色颗粒，某些部位染成黑色，定量分析细胞内的碱性磷酸酶、骨钙素水平明显高于成纤维细胞；细胞免疫组织化学染色表明其主要合成Ⅰ型胶原。

Several physical and chemical properties, such as pH, refractive index,heavy metal content, infrared spectrum, heat stability and residual acrylamide, were determined for medical-use polyacrylamide hydrogel samples.

医用聚丙烯酰胺是以丙烯酰胺为原料合成的，具有广泛用途的水溶性高分子，PAM水凝胶主要用于人体软组织填充[1，2 ] ，也可用于医药软膏、药膜和药物载体。医用PAM水凝胶的主要理化性能包括外观、pH值、折射率、重金属含量、红外光谱、化学热稳定性和丙烯酰胺单体残留量。

It has been tried to in- duce active hydrolytic grop to the ligands of BAT, attempting to use chemical hydrolyses instead of biological hydrolyses to find ide- al brain radiopharmaceuticals. However, because of the immense work, the shortage of funds, only the syntheses of some latents have been done in this theses, and further study is still needed.

本论方中企图通过对BAT类配体引入活泼水解基因，采用化学水解代替生物水解找到理想的脑放射性药物，但因工作量大，消耗经费等问题，本论文中只作了一些潜体的合成，有关工作，有待于进一步研究。

Ten N-[2,4-disubstituted-5-(3-methy-2,6- di-oxo-4-trifluoromethyl-1,2,3,6-tetrahydropyrimidin-1-yl)phenyl]imides were designed and synthesized. Their structures were confirmed by 1H NMR, IR, HPLC/MS and elemental analysis.

设计并合成了10个未见文献报道的N-[2，4-二取代-5-(3-甲基-2，6-二氧-4-三氟甲基-1，2，3，6-四氢嘧啶-1-基)苯基]酰亚胺类化合物，其化学结构经1H NMR， IR， HPLC/MS和元素分析表征。

The method avoids loose and porous hydrotalcite thin film by traditional chemical conversion method and powder coating method, and has such advantages as simple process and mild synthesis conditions. The obtained hydrotalcite thin film has excellent anticorrosive performance, and can improve the anticorrosive performance of Mg alloy.

本发明避免了传统的化学转化法和粉体涂覆法得到的水滑石薄膜结构疏松多孔的问题，且工艺简便，合成条件温和，比传统的水滑石膜层更具有优良的抗蚀性能，可以提高镁合金的耐腐蚀性能。

This article main research take the titanium sulfate and the iron trichloride as a raw material, take the urea as the alkali source, uses the cryochemistry method, the synthesis superfine TiO2-Fe2O3 compound photocatalyst, and has studied the sample structure and the ultraviolet receptivity with the X-ray diffraction and the ultra-violet spectrograph.

本文主要研究以硫酸钛和三氯化铁为原料，以尿素为碱源，采用低温化学方法，合成超细TiO2-Fe2O3复合氧化物，并用X射线衍射和紫外光谱研究了样品的结构和紫外吸收性能。

Chemistry is concerned with the physical and chemical properties, composition and structure of all living and non-living materials, and how we synthesise such materials and modify them for their safe and beneficial use in our modern lives.

化学关注的是物理性质和化学性质、生物和非生物的组成及构造、以及我们如何人工合成这些材料让他们变的安全和在生活中有益的使用。

Syngas can be converted to hydrocarbon products via F-T synthesis, and this provides a new way to make use of carbon sources.

合成气经过F-T反应转化为烃类产品长期以来一直是催化和化学工程领域研究的一个重要课题。此过程的核心是催化剂和工业反应器技术的研究与开发。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失