化学

The existence of natural toxins is a fundamental phenomenon of life, it is a set of specific bioactive chemical substance, which evolved through a long period from nature. Natural toxins show multiplicities in biogenic source, chemical structure, biological function and active mechanism.

文摘： 生物毒素的存在是一种重要的生命现象，它是自然生物界长期进化发展的具有特殊生物活性的化学产物，而且在生源、化学、功能、作用机制等方面表现出多重多样性。

PH, dissolved oxygen and chemical indexes for instance total nitrogens, total phosphorus, chemistry oxygen depletion; appraised phytoplankton species complexity; numerated phytoplankton cell density; analyzed various kinds of biological diversities.

主要测定了水温、透明度、pH、溶解氧等物理指标；总氮、总磷、化学耗氧量等化学指标；同时对浮游植物的种类组成、细胞密度和生物多样性指标进行了鉴定、记数和分析。

The influencing effects of grain production systems on the population of second generation of cotton bollworm in cotton were studied. The multi-harvest system provided cotton a good protection against cotton bollworm due to the corn plants in this system strongly attracted cotton bollworm adults when they were ovipositing, therefore reduced the density of cotton bollworm in cotton, compared with ton-grain system..

转Bt基因抗虫棉对棉田节肢动物多样性的影响用吸虫器取样和捕虫网取样两种方法，研究了转基因抗虫棉和化学防治对棉田节肢动物多样性的影响，发现转Bt基因棉棉田与非转基因常规棉棉田棉花害虫、自然天敌和中性节肢动物亚群落没有显著差异，而化学防治可以使各亚群落的个体数量、物种数量、多样性指数发生剧烈变化。

Organic agriculture is aimed to reduce external inputs by refraining from the use of chemical fertilizers and chemical pesticides.

有机农业的目标是避免使用化学肥和化学农药，减少外界元素。

The thermatic fibrous sepiolites are ones of rich Magnesium,richened with Magnesium,silicon and few Aluminum,and the sedimentary clayey sepiolites are ones of rich Aluminum,have lower Magnesium,Silicon and higher Aluminum.

本文通过两种不同成因海泡石化学成分特征的研究发现，热液型海泡石和沉积型海泡石的化学组成有较大差异，热液型纤维状海泡石MgO、SiO2含量高，Al2O3含量低，为富镁海泡石；沉积型粘土状海泡石MgO、SiO2含量低，Al2O3含量高，为富铝海泡石。

The properties of ISEsand sensitizing luminescence of rare earth cations were also studied.

超分子化学是当前化学、生命科学和材料科学的前沿研究领域之一。

Four pulps were sieved to long, middle and short fiber, and total charges and surface charges of the each fiber constituent were determined.

分析了漂白马尾松化学浆、漂白芦苇化学浆、马尾松热磨机械浆和废纸浆的长、中、短纤维含量以及它们的总电荷量和表面电荷量。

Key players at the base of the marine food web are diatoms (unicellulor algae with silicified cell walls) and their main predators, the herbiorous copepods.

本文对硅藻产生的防御性物质oxylipins的化学生态学及其在极低浓度下如何其作用进行了综述，同时对其生物合成、测试和化学防御对浮游生物群落结构的影响等进行了讨论。

The integration of the in-situ chemical oxidation, the air sparging and soil vapor extraction is an innovative technology. However, as the domestic remediation cases are concerned, the local contractors use gravitational injection to inject chemical oxidants in order to save cost.

现地化学氧化法整合空气曝气法及土壤气体抽取法系统为一项创新的技术，而国内现阶段之整治案例，厂商为节省成本考量化学氧化剂注入方式系以重力式注入为主。

Maybe sterilizing with that antique was very boring, nevertheless, it control the result of all the experiment.

还记得当年有人问我化学是什么，我的回答是：几种溶液混合在一起会变色的，那就是化学。

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。