查询词典 chemical

The physical and chemical properties of carboxylic acids are molecules that exist in a variety of chemical groups in the overall performance.

羧酸的物理和化学性质是分子中存在的各种化学基团的总表现。

To study the chemical constituents from the leaves of Celastrus gemmatus Loes., chromatographic methods were used to isolate and purify the chemical constituents, their structures were elucidated by the physiochemical characteristics and spectral data.

为研究哥兰叶(Celastrus gemmatus Loes。)中的化学成分，用Diaion HP-20，Toyopearl HW-40，silica gel等柱色谱方法，从其70﹪含水丙酮提取物中分离得到化合物，并根据理化性质和波谱数据鉴定其结构。

SINMAYA imports water based additives, powder materials, and dry-mixing mortar additives, main suppliers including DOW Chemical Company, Ashland Specialty Chemical Company, Millennium Chemicals, INEOS Silicas, Celite, MELICSEA, Thor, ELEMENTS SPEICALTIES, PROTEX and Group TOLSA etc.

至今已成功引进中国北方涂料市场的代表性产品有：水性涂料用助剂、粉料、色浆色卡调色设备及干混砂浆中添加剂。主要的供应商包括陶氏化学、美礼联、英力士、赛立特、索尔、海明法国宝时和西班牙TOLSA集团等。

This paper reviewed detailedly chemical structure,physical and chemical characteristics,relation of structure and effect,toxicity of chloramphenicol,metabolism and residual in animal body,measurement method of residual of chlor...

本文就氯霉素的化学结构、理化特性、构效关系、毒性作用，在动物体内的代谢与残留，检测方法中的筛选法、定量测定法、确证法等进行了详尽阐述。

Tianjin Botian Chemical Co., Ltd. is a state-level large chlor- alkali enterprise with nearly 70 years history since its establishment in 1938. It is affiliated to Tianjin Bohai Chemical Co., Ltd. and obtains a solid strength.

天津渤天化工有限责任公司是国家级大型氯碱企业，自1938年建厂，迄今有近70年的历史，隶属天津渤海化工股份有限公司，具有雄厚的实力。

Project Contents: Methane chloridate is a kind of chemical product including monochloro methane, dichloro methane, trifluoro methane, tetrachloromethane. It is an important chemical material and solvent.

建设内容：甲烷氯化物是一氯甲烷、二氯甲烷、三氯甲烷、四氯化碳四种甲烷氯化物的总称，是主要的化工原料和溶剂。

Dry chemical methods is more reliable than wet chemical methods in chylemia detection.

在乳糜血检测中干性化学法与湿性化学法比较更接近真实值。

In this paper,the research history of microscale chemical experiment is briefly introduced,the preparation of cinnamic acid by means of microscale apparatus is investigated,and the characteristics of microscale chemical experiment and the optimum conditions are studied.

简单介绍了微型化学实验的研究历史，并以肉桂酸的制备实验为研究对象，分析了微型有机化学实验的特点，研究了肉桂酸制备的微型实验的最佳反应条件。

Nutrition solution culture, ICP-AES, the differential centrifugation technique and sequential chemical extraction method, suppression subtractive hybridization , RAPD were used in this thesis to study the mechanisms of copper tolerance and accumulation by Commelina communis grown in copper mine deposit which was reported to be a Cu hyperaccumulator, compared with C. communis grown in normal soil. Several aspects were examined, including: difference of copper tolerance and accumulation between C. communis grown in copper mine deposit and that grown in normal soil; difference of growth and nutrient accumunation between C. communis grown in copper mine deposit and that grown in normal soil under copper treatment; physiological differences between between C. communis grown in copper mine deposit and that grown in normal soil under copper treatment; subcellular distribution and chemical forms of Cu in C. communis; identification of cDNA fragments differentially expressed in C. communis grown in copper mine deposit; genetic diversity and copper tolerance of C. communis, tolerance mechanisms to copper in C. communis are discussed.

中文题名鸭跖草对铜的耐性机理和富集特征研究副题名外文题名 Mechanisms of Cu tolerance and accumulation by Commelina communis 论文作者廖斌导师蓝崇钰束文圣学科专业环境科学研究领域\研究方向学位级别博士学位授予单位中山大学学位授予日期2003 论文页码总数128页关键词重金属污染植物修复超富集植物土壤污染铜污染鸭跖草馆藏号BSLW /2003 /X53 /12 论文以本实验室报道的生长于矿山上的铜超富集植物鸭跖草和生长于正常土壤中的鸭跖草为试验材料，分别运用溶液培养法、ICP-AES元素测定技术、差速离心法和化学试剂逐步提取法、抑制消减杂交技术、RAPD技术研究了矿山和非矿山两种生境鸭跖草对铜的耐性和吸收积累的差异，两种生境鸭跖草在铜胁迫下养分吸收和积累的差异，两种生境鸭跖草在铜胁迫下生理反应的差异，以及铜在鸭跖草细胞内的分布及结合形态研究，矿山鸭跖草差异表达的cDNA克隆，铜对鸭跖草种群遗传分化的影响，从这几个方面探讨了矿山鸭跖草对铜的耐性机理。

Horny layer is the outmost layer of epidermis, its thickness is decided by different parts of human body, it's about 0.02mm at the thinnest parts, and 0.5mm at the thickest. It is made up of 5-10 layers of enucleated cornified cells that contains keratin and horny fat, which has the capability of resisting weak acids and weak bases , they array closely and become a natural barrier to moisture content and some chemical substances, so as to prevent the water logging of bodily fluids and endosmose of chemical substances.

角质层是表皮的最外层，其厚度依身体部位的不同而定，最薄处约0.02mm，最厚处约0.5mm由5-10层含有角蛋白和角质脂肪的无核角化细胞组成，角质层细胞有抵抗弱酸弱碱的能力，角质层细胞排列紧密，对水分及一些化学物质有天然屏障作用，因而可以阻止体内液体的水渗和化学物质的内渗。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。