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对苯二酚

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Catechol/hydroquinone is extremely important organic intermediates widely used pesticide, medicine, dyes, spices, additives and other fields.

邻/对苯二酚是极其重要的有机中间体,广泛用于农药、医药、染料、香料、助剂等领域。

One of the most dangerous is hydroquinone.

其中一个最危险的是对苯二酚

One of the most dangerous is hydroquinone .

其中最危险的一种成分是对苯二酚

Alternatively, it can be combined with small concentrations of hydroquinone.

另外,可以结合小浓度的对苯二酚

Furthermore, it is the only US Food and Drug Administration-approved product containing hydroquinone.

此外,它是唯一由美国食品及药品管理局批准含对苯二酚的产品。

Hydroquinone should not be used during pregnancy or when lactating.

对苯二酚不应被用作在怀孕期间或哺乳时。

The reaction conditions for synthesizing methylhydroquinone using p nitrotoluene and conc.H\-2SO\-4 in the presence of catalyst were studied experimentally with the uniform design method,and the major influencing factors were researched.

用均匀设计法实验研究了对硝基甲苯与浓硫酸在催化剂作用下合成甲基对苯二酚的反应条件,考察了各种影响因素。

The conversion of product reaches 98% under the optimal experiment condition: the molar rate of acrylic acid and tetradecyl alcohol is 1.1; the amount of p-methyl benzene sulfuric acid is 0.8%; the amount of p-benzened...

得出合成丙烯酸十四酯的最佳合成条件:丙烯酸与十四醇摩尔比为1 1,对甲苯磺酸用量为0 8%,对苯二酚用量为0 6%,反应温度为120℃,反应时间为4h。

The optimal parameters for catalytic reaction of LiP or MnP on theelectrode in electrochemical enzyme sensor are obtained,which are pH of4.2,H_2O_2 concentration reaching 0.1875 mM,0.25 mM hydroquinone and 6mM veratryl alcohol.In the optimal reaction system,LiP and MnP aredetermined exactly by the sensor.

实验确定了电化学酶传感器裸玻碳电极对LiP、MnP体系的催化反应的响应最为灵敏且电流变化较大的最适pH值(pH4.2)、H_2O_2(0.1875 mM)、对苯二酚(0.25 mM)、藜芦醇(6 mM)含量等参数,在该反应条件下传感器能准确测定LiP、MnP。

MATERIAL AND METHODS: Human tibial plateaus were procured from multi-organ donors, with the approval of the Ethics Committee of the University Hospital of Coimbra.

我们本次试验是为了确定单独使用糖基化对苯二酚,熊果苷,或合并使用低浓度的其他低温防护剂,是否对关节软骨起到低温防护作用。

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In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是,在否定句或疑问句里,这种带有"do"的方法表达的效果却没有什么强调的意思。

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