查询词典 pyrocatechol

After 48h exposure, The GST activities were all inhibited under the exposure of phenol and pyrocatechol, but the GST activities were induced at first and then inhibited under the exposure of resorcinol.

处理48h后，体内GST活力随苯酚和邻苯二酚浓度的升高逐渐降低，而间苯二酚对GST活力的影响与处理24h后GST活力的变化趋势相似。

A spectrophotometric determination of iodine by oxidation decoloration reaction of pyrocatechol violet by iodatein a strong acid medium is reported in this paper.

本文提出了在强酸性条件下，根据碘酸根氧化邻苯二酚紫使其褪色吸光光谱法测定加碘食盐中碘含量的分析方法。

According to the differences of the materials, there are many methods of synthesis for benzofuranol , such as the pyrocatechol method, the cyclohexanone method, the o-chlorophenol method, the nitrophenol method, the methoxy phenol method, and so on.

根据原料的不同，呋喃酚合成方法可分为邻苯二酚法、邻氯苯酚法、环己酮法、硝基苯酚法、愈创木酚法、邻异丙基酚法、羟基苯异酮法等，文章对前几种较常见的合成方法的原理及工艺进展进行了详细的综述，并展望了呋喃酚合成方法的发展趋势。

Their electrochemical behaviors for single solute and mixed systems of hydroquinone(H2Q) and pyrocatechol are investigated.A pair of redox peak of H2Q and two pairs of redox peaks of PC on the composite film electrodes can be obviously distinguished in their mixed systems,which show the composite film electrodes have excellent electrocatalytic activity for two ...

结果表明聚苯胺复合膜电极具有很好的电催化作用，在混合体系中对苯二酚的一对氧化还原峰和邻苯二酚的两对氧化还原峰能够清楚地区分；并且在一定的浓度范围内单组分的浓度与峰电流呈良好的线性关系，说明该电极对苯二酚的测定在定性、定量中具有潜在的应用价值。

The linear ranges of determination for pyrogallol, phloroglucinol, pyrocatechol, resorcinol and parodioxybenzene were 1.0×10〓～2.0 ×10〓mol l〓, 1.0×10〓～1.0×10〓mol l〓, 1.0×10〓～6.0×10〓mol l〓, 1.0 ×10〓～2.0×10〓mol l〓 and 1.0×10〓～6.0×10〓mol l〓 respectively, and their detection limits were 7.2×10〓mol l〓, 6.8×10〓mol l-1, 2.1 × 10〓mol l〓, 7.1×10〓 mol l〓 and 2.2×10〓mol l〓 respectively.

该方法测定连苯三酚、间苯三酚、邻苯二酚、间苯二酚和对苯二酚的线性范围分别为1.0×10〓～2.0×10〓mol l〓，1.0×10〓～1.0×10〓 mol l〓，1.0×10〓～6.0×10〓mol l〓，1.0×10〓～2.0×10〓mol l〓和1.0×10〓～6.0×10〓mol l〓；检出限分别为7.2×10〓mol l〓、6.8×10〓 mol l〓、2.1×10〓 mol l〓、7.1×10〓mol l〓和2.2×10〓mol l〓。

The highly sensitive chromogenic reaction of a ternary complex of 4-(2-benzothiazolylazo) pyrocatechol with Mo-, W-diphenyl guanidine and the application of partial least squares method in simultaneous spectrophotometric determination of trace Mo and W have been studied.

本文研究了新显色剂4-(2-苯并噻唑偶氮)邻苯二酚-Mo、W-二苯胍三元配合物的高灵敏显色反应以及偏最小二乘法在同时分光光度测定痕量钼和钨中的应用。

Large single crystals were also obtained by using pyrocatechol as additive. It was shown by 〓Si-NMR and IR that Sipyrocatechol complex was formed in the reaction system.

在F〓体系中，F〓对铝源和硅源起络合和矿化作用，形成可溶性氟硅酸盐AlF〓〓、SiF〓〓络合物，然后缓慢水解成含氧氟硅酸盐络合物，它们再发生定向缩聚，提供了分子筛晶体生长所需的可溶性结构单元。

Amounts of 2 furaldehyde and 5 hydroxymethyl 2 furaldehyde in wood vinegar from the treated wood were increased,but amounts of carboxylic acids,phenols,pyrocatechol,guaiacols,and maltol were almost constant.

与未处理材相比，处理材木醋液中糠醛及5 羟甲基糠醛的收量增加，而羧酸类、苯酚类、邻苯二酚、愈创木酚类及麦芽酚的收量几乎不变。

Category Ⅰ: lgβ〓=16～19, lgβ〓=28～32, lgβ〓＞32,Δ～12, such as solochrome violet RS and pyrocatechol violet, they can be employed for determination of Al〓 at pH 4～5, while at pH 8～9 the complex ability of reagents increased obviously, so it can be used for the determination of Al〓.

类试剂：累积稳定常数较大。lgβ〓＝16～19，lgβ〓＝28～32，lgβ〓＞32，△～12。如酸性媒染紫、邻苯二酚紫。该类试剂在酸性pH4～5下可测定无机单核铝，而在碱性pH8～9下测定总单核铝；由于lgβ〓均较大，易和铝形成螯合能力极强的1∶3配合物。

The results were as follows: the activity of prawns was highest under the condition of pH 7.0, 35 ℃ using pyrocatechol as substrate; four inhibitors i.e ascorbic acid1 mg·mL~(-1, sodium sulphite2 mg·mL~(-1, phytic acid1 mL·L~(-1 and EDTA0.1 mg·mL~(-1 had some inhibiting effects on the PPO of prawns, in which the effect of phytic acid1 mL·L~(-1 was the best; the PPO activity of prawns increased gradurally during the storage period; the PPO activity of prawns was inhibited in vacuum environment, the lower the storing temperature was, the stronger the PPO activity was.

结果表明：以邻苯二酚为底物，虾PPO活性的最适pH为7。 0，最适温度为35 ℃；4种抑制剂(1 mg·mL-1抗坏血酸、2 mg·mL-1亚硫酸钠、1 mL·L-1植酸及0。 1 mg·mL-1EDTA)对南美白对虾PPO都表现出一定的抑制作用，以1 mL·L-1植酸抑制作用最强；南美白对虾在贮藏过程中PPO活性逐渐上升，真空环境中PPO活性受到抑制，贮藏温度越低，抑制作用越强。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。