物质

ABSTRACT Objective: We found an active compound in Styela clava Hedman, during separation and screening of marine life. This compound is a sterol, it possess reduction and stronger Oxidation. It shows very strong anti-hepatitis B vires activities in vitro.

目的： 在进行海洋生物活性物质分离筛选的过程中，我们发现柄海鞘中的一个具有很高药用价值的活性物质—海鞘醇，这是一个既具有还原性有具有较强氧化性的甾醇类有机化合物，实验表明它具有极高的对抗乙型肝炎病毒的体外活性。

The result shows that the spatial distribution of coalescent filler has great effect on the coalescent removal of oil.

同时，废水中还含有大量的表面活性剂、聚合物、碱等物质，这些物质的存在又进一步增加了原油在水中的稳定性，使得现有的重力除油设施除油效率很低。

The higher people's living standard is,the more obvious the spiritual and material of unity needs,we request that the spirit of the art of the introduction of specific material design, and design requirements of the entity to become the carrier of the arts,and then presents in front of the people compositely. This requires the art and design must be to a considerable extent to convergence.

人们的生活水平越高，对于精神与物质相统一的需求就越明显，既要求将艺术的精神引入具体的物质设计，又要求设计的实体成为艺术的载体，并复合地呈现在人们面前，这就要求艺术与设计必须在相当程度上走向趋同逐渐融合。

It can improve the conflagrant properies of tobacco when cobalt joined, and the min-nim selenium can reduce the deleterious substance in the cigcarette haze, and reduce the harm to health,therefore in this paper we have researched the adsorptive properities of cobalt on tobacco and some factors which affect the adsorption of selenium on tobacco by the theory of liquid - solid adsorption . We have discussed the influences of the adsorbate concentration. temperature, pH and certain concomitant substance, and have determined adsorption isothermal under the different temperature.

微量元素钴的加入能改善烟丝的燃烧性能；微量硒的存在能降低烟气中有害物质，减轻吸烟对人体健康的危害，因此本论文利用固—液吸附理论研究了钴在烟草上的吸附性能以及硒在烟草上吸附的一些影响因素，探讨了吸附质浓度、温度、pH及某些共存物质对吸附的影响，测定了不同温度下的吸附等温线。

The results of HPLC tests indicated that Bt toxin in Bt transgenic cotton had not obviously affected the contents of flavonoids (mainly rutin and isoquercitrin and a few quercetin ),contradictively ,the result of combined dosage test in vitro showed that that rutin had significantly enhanced the suppression of Bt-ICP on the cotton bollworm larvae., in addition to the

采用高效液相色谱法测定转Bt基因棉花主要抗虫黄酮类化合物的的变化，结果表明外源Bt杀虫蛋白表达不会对棉花自身原有的主要抗虫黄酮类物质（包括芸香苷、异槲皮苷和含量较少的槲皮素）产生不利的影响，因此可以将Bt杀虫蛋白基因转入抗虫黄酮类物质中国农业科学院博士学位论文含量高的棉花品系。

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。

The concentration of Cosmogenic nuclides is not only constrained by production rates and exposure time, and also closely related to surface erosion. Furthermore, the concentration is affected by geomagnetic intensity, shielding, chemical weathering, and sample geometry as well. These factors affecting Cosmogenic nuclide concentration should be calibrated when surface exposure age is calculated.

地表物质中宇宙成因核素浓度除了受到核素生成速率和地表物质的暴露时间制约外，还与地表侵蚀速率密切相关，此外，地磁场强度、遮蔽、化学风化及样品的几何位置等也会对核素浓度产生一定影响，在求算样品的地表暴露年代时，应对这些因素进行相应的校正。

Methods The flavonoids were extracted by ethanol as the solvent from Bragica juncea coss with ultrasonic wave and ethanol extraction .

方法采用超声波乙醇浸提法从芥菜中提取黄酮类物质，对所提取的黄酮类物质进行验证，并用分光光度法测定含量，用芥菜总黄酮对羟自由基清除作用进行实验。

The main compnents were cuminal and safranal (accounting for 32.26% and 24.46% respectively inthe components identified).

另有9种含量在1%以上的物质，主要是萜类中的单萜、倍半萜和芳香族醛、酮醚类物质。

MethodsThe flavonoids were extracted with ethanol as the solvent from Cyperus rotundus by ultrasonic wave. Spectrophotometry was used to determine the flavanone of Cyperus rotundus .

方法采用超声波乙醇浸提法从香附中提取黄酮类物质，对所提取的黄酮类物质进行验证，并用分光光度法测定含量。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。