向水性

Hydrotropism A tropism in which the stimulus is water. It is a special kind of chemotropism.

向水性：是由于水分刺激而产生的向性运动，属于向化性的一种特殊类型。

Widely distributed in Central America of fresh water and salt waters, the United States for the main freshwater aquaculture species. 1999 U.S. freshwater aquaculture production accounted for about 81 percent of the large warm-water species of fish, fork spots to fish tail as the Ministry of Agriculture to promote the country's fresh water breeding improved varieties have a very obvious advantages: First of Table no scales no small thorn, processing convenience and the other is the quality and refine, nutrient-rich, easy to digest and absorb the third is of miscellaneous eating habits, fast-growing, high yield, strong adaptability and easy to keep the fourth character is tame, like cluster activities , High density of aquaculture, particularly the pond custody and cage culture Fifth Tansi, easy fishing, Youdiao suitable for the development of leisure industry.

广泛分布于美洲中部的淡水和咸水水域，为美国的主要淡水养殖的品种。1999年约占美国淡水养殖总产量的81%，该鱼种是大型温水性淡水鱼类，斑点叉尾回鱼作为农业部向全国推广的淡水养殖的优良品种具有很明显的优点：一是体表无鳞没有小刺，加工方便；二是内质细嫩，营养丰富，容易消化吸收；三是食性杂，生长快，产量高，适应性强，易于饲养；四是性格温顺，喜好集群活动，可以高密度的养殖，特别是池塘主养和网箱养殖；五是贪食，易垂钓，适合发展休闲游钓业。

This artical summarized the research progress on hydrotropism of plant root system internationally from three aspects such as,how to induce hydrotropism by roots, root cap is the site of apperceiving humidity gradient,and the research on hydrotropism at the molecular level.

主要从根部如何诱导向水性、根冠是感知度梯度部位及在分子水平对向水性研究3个方面，总结了国际上植物根系向水性研究的进展。

On the base of these studies, TiO_2 was added to the copolymer resin solution to improve the anti- ultraviolet function. As a result, siloxane-acrylate coatings with good water-proofness, excellent perdurability and high heat resistance were prepared.

在此基础上，向共聚溶液中添加二氧化钛作为紫外光吸收剂，制得了憎水性好、耐候性优良、热稳定性高、有机硅改性丙烯酸酯涂料。

Study on the Capability of Anti-ultraviolet Rays of Tussah Silk Fibroin Powder and the Compatibility with Cosmetics

采用对环境污染小的水性聚氨酯作涂层剂，利用自制的羊毛角蛋白溶液对其进行改性以提高涂层织物的透湿性能，同时向涂层剂中加入抗紫外线纳米粉体。

Cation group has the capability of charge neutrality and this would make oily wastewater demulsify and remove oil easily. Hydrophobic group would improve hydrophobic-oleophilic nature of the oil granule. Simultaneously, wetting reversed agent would change wetting performance of oil granule, enhance conglutination capability between air bubble and oil granule. And Frother would form bigger foam layer on the water, so it could prevnt granule with air bubble from rolling downward.Using the hydrophobic polymeric flocculant as one of ingredients for flotation agent formula, the flotation agent has good treatment effect.

浮选剂配方中的疏水性高分子絮凝剂分子链上带有的阳离子基团起到电中和作用，使含油污水易于破乳除油，而疏水基团能增强颗粒的疏水性能；润湿反转剂能改变颗粒的润湿性，增强气泡与颗粒的粘附能力；起泡剂在水面能形成强度较大的泡沫层，起阻止带气絮粒向下翻动的作用。

Roots are positively hydrotropic and hypocotyls negatively hydrotropic.

根主动向水而胚轴具有负向水性。

The impact of temperature,pH and ionic strength on the volume phase transition of the hydrogels is studied.The result shows that the volume phase transition temperature of ionizable and thermosenstive copolymer hydrogels depend upon the hydrophilic/hydrophobic character of the comonomers...

结果表明，疏水基末端端基的疏水程度决定凝胶体积相变的速率，随着疏水性单体甲基丙烯酸酯烷基链的增长，凝胶的疏水性增强，凝胶的相转变pH向低pH处迁移；温度高于LCST时，分子间的氢键作用减弱，疏水基团间的相互作用加强，凝胶发生体积相变。

Organics which could be volatilised easily or difficultly decreased fast at the early days, then decreased slow, but the organics which can volatilised easily decreased faster. Hydrophilic organics in the raw water decreased , while hydrophobe organics incresed. 4 Stainless steel and acid-resistant keramics showed less effect on the water's qulity, while the fiber steel which had used for storage in the experiment showed great effect.

随着贮存时间的延长，水中4KD～10KD所占比例升高，而4KD以下的有机物所占比例则下降；水中难吹脱性有机物与水中易吹脱性有机物都减少，且初期下降快后期下降慢，但易吹脱性有机物减少速度快于难吹脱性有机物；水中亲水性有机物所占比例下降，而疏水性有机物所占比例上升，发生了亲水性TOC向疏水性TOC转化。

Recently, in order to adapt to the demands of environmental protection, for surface finishing of varnish is progressively from solvent-based light oil to water-based conversion varnish.

近来，为了适应环保要求，用于表面加工的光油正逐步从溶剂型光油向水性光油转化。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。