物质

The influences of dioxins on human health and the situation of its emission in China are presented,and its pollutant sources are analyzed.It is pointed out that to resolve the dioxin pollution problems in China some work for instance the investigation of pollutant sources must be carried through;the inspective system made perfect;the pollutant sources treated through the circular economic method;the study of environmental iatrology s...

介绍了二噁英类物质对人体健康的影响以及我国二噁英类物质的排放情况，对二噁英的污染源进行了分析，指出要解决我国二噁英的污染问题应该立即开展对污染源的调查；完善监测系统；利用循环经济的原理从源头进行治理；加强对环境医学的研究；加强对二噁英类物质降解过程的基础研究。

At the same time, some of the pyrolysates are the important favors in cigarette smoke, such as isophorone and megastigmatrienone, etc. The amounts of these pyrolystaes alter with the change of pyrolysis temperatures and the concentration of oxygen. the lutein is applied to cigarettes as flavoring.

分析结果表明，叶黄素的裂解产物主要是甲苯和对-二甲苯等苯及其同系物、1，2–二氢-1，1，6-三甲基-萘和2，7-二甲基萘等萘及其同系物，另外还生成氧化异佛尔酮和巨豆三烯酮等酮类物质和烯烃类物质等，这些物质随着裂解温度和裂解氛围的变化，其种类和峰面积归一化百分含量有所不同。

It is abundant in many kinds of health beneficial elements. It contains the oxidation resisting flavonoid at a high level and rutin which is rich in asparagus and is an effctive anticancer element. It also provides ursolicacid, oleanonic acid and other saponins which is helpful for lipids metabolism and for strenghtening immunity, cyclic adenosine monophosphate, and Sucrose Mortierellate that is useful for preventing aging and knub.

其中具有抗氧化作用的类黄酮含量十分丰富，包括芦笋中引以为傲的芦丁这种预防癌症成分，还有熊果酸、齐墩果酮酸等能够改善脂质代谢和提高免疫力作用的皂甙类物质，环腺苷酸等能量增强物质，以及具有抗衰老和抑肿瘤作用的多糖类物质。

Limonin and Naringin are the main bitters in citrus juice,so the citrus juice may become bitter.

柠檬苦素和柚皮苷等物质是柑橘类果汁中主要的苦味物质，果汁中因含有这类物质而具有苦味，因而会明显降低柑橘类果汁的口感和品质。

Limonin and Naringin are the main bitters in citrus juice, so the citrus juice may become bitter. And they can decrease the quality of citrus juice.

柠檬苦素和抽皮苷等物质是柑橘类果汁中主要的苦味物质，果汁中因含有这类物质而具有苦味，因而会明显降低柑橘类果汁的口感和品质。

Regular diet, in addition to containing a large number of animals necessary nutrients, but also contains a certain amount of anti-nutritional factors, these anti-nutritional factors is difficult to digest in the use of sheet monogastric animals, so that intestinal contents became viscous, and wrapped a large number of nutrients, affect the digestion and absorption of nutrients, resulting in animals indigestion, lax and poor growth.

常规日粮中，除含有大量动物必须的营养物质外，还含有一定量的抗营养因子，这些抗营养因子难被单胃动物消化利用，使肠内容物变得粘稠，而且包裹大量的营养物质，影响营养物质的消化吸收，造成动物消化不良，排粘粪，发育不良等。

Gas chromatograph/mass spectrometer system was used to analyze polycyclic aromatic hydrocarbon (PAHs, including naphthalin, anthracene and fluoranthene) and phthalic acid ester [PAEs, including dimethyl phthalate, diethyl phthalate, diisobutyl phthalate and di(2-ethylhexyl) phthalate] concentration in water samples taken from every treatment units of a large-scale waterworks in a western city whose water source is the upstream of Yangtze river.

以多环芳烃(包括萘、蒽、荧蒽三种物质)和邻苯二甲酸酯包括邻苯二甲酸二甲酯(DMP、邻苯二甲酸二乙酯、邻苯二甲酸二异丁酯、邻苯二甲酸二(2-乙基己基)酯4种物质作为研究对象，采用GC-MS方法测定了以长江为原水的某大型城市给水厂各工艺段水样中的上述物质。

Concentrations of water soluble phenolic substances in the leaves of male and female trees of Acer negundo L.were successively determined within an entire growing season by method of iron tartrate colorimetric analysis.

采用酒石酸铁比色法对复叶槭雌、雄株叶片中水溶性酚类物质的含量进行了一个生长周期的跟踪测定，对不同性别、不同年龄、不同光照条件下的复叶槭植株叶片中水溶性酚类物质的含量做了比较分析，同时研究了叶片中叶绿素的含量与水溶性酚类物质含量之间的关系。

State Huckel's rule for deternining whether a molecule is aromatic or antiaromatic or nonaromatic and List aromatic,antiaromatic,and nonaromatic compounds.

答： 根据休克尔规则判断下列化合物是否具有芳香性。并列出下列化合物哪些是芳香性物质，非芳香性物质，反芳香性物质

In the 29 Aroma material studied, the content of the material having important effect such as norambreinolide, octadecanoic lactone(1), octadecanoic lactone(2), octadecanoic, 8,15-labdanum-1-ol,8,12-external oxidative labdanum-14-en-2-ol(1), 8,12-external oxidative labdanum-14-en-2-ol(2), 8,13-external oxidative labdanum-14-en-13-one(1), 8,13-external oxidative labdanum-14-en-13-one(2) Dihydroactinidiolide, solanone, norsolanone have Significant increasing trend in the aging, the peak of the content of material appear in the 18~21 months in the aging process.

在所测定的29种香气物质中，对香料烟特征香气有重要影响的香味物质如降龙涎香内酯、硬尾内酯2种异构体、硬尾醛、8，15－赖百当醇、2种8，13外氧赖百当－14－烯－13醇异构体和2种8，13外氧赖百当－14－烯－13－酮异构体，二氢猕猴桃内酯、茄酮和降茄二酮等成分在陈化过程中有明显的增加，总的香气物质含量变化的高峰期出现在陈化18~21个月。

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。