萘醌

A novel and simple spectrophotometric method for determination of hydroquinone with 1,2-naphthoquinone-4-sulfonate reagent was developed.

建立了用1，2-萘醌－4-磺酸钠分光光度法测定对苯二酚的新方法。

But the author found that there was another impurity in VK_1 and its amount was even larger than menadione in some samples of VK_1 and its amount will obviously increase when exposed to light.

在对维生素K_1的有关物质检查中发现，维生素K_1样品中除杂质甲萘醌外，还有一主要的未知杂质，且在光照的条件下，其量会明显增加。

It's required for VK_1 in the present compendial monographs that the content of menadione should be strict controlled and the other impurities are controlled as related substances using colorimetry or TLC method.

目前各国药典维生素K_1的质量标准中，都是采用比色法或TLC法检查甲萘醌，而其他的杂质则作为"有关物质"同时进行检查。

Stable Vitamin K 3 is synthesized by addition reaction of raw materials of niacinamide, chlorhydric acid and menadione sodium bisulfite at 25℃.

以烟酰胺、盐酸为原料，在 2 5℃反应得烟酰胺盐酸盐溶液，而后与亚硫酸氢钠甲萘醌发生加成反应，反应的物料配比为：n ∶ n ∶ n =1∶1。

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amino-1,4-naphthoquinones failed to be obtained through the classical routes due to the strongly electron-withdrawing nitro group, which deactivating the nucleophilic ability of the nitro anilines.

2-硝基苯胺-1，4-萘醌类衍生物由于硝基的强吸电性使硝基苯胺的亲核性减弱，不能通过经典的加成-氧化或加成-取代的方法合成得到。

Rate constants of carbon dioxide radical anion〓 reacting with 5,5dimethyl-1-pyrroline-N-oxide、1-naphthoquinone and N,N,N,N-tetramethyl 1,4 -phenylene diamine were determined by detecting the changes of radical concentrations with time, and they were 5.5×10〓mol〓Ls〓、4.5×10〓mol〓Ls〓 and 6.7×10〓nol〓Ls〓 respectively.

测定了在含〓的CdS胶体体系中〓与5，5-二甲基-1-吡咯氮氧化物、1-萘醌和N，N，N，N-四甲基对苯二胺正离子自由基反应的速率常数，它们分别为5.5×10〓mol〓Ls〓、4.5×l0〓mol〓Ls〓和6.7×10〓mol〓Ls〓。

In the work, the laser-behavior under exposure of Ar〓 laser was discussed. The kinetic process of photochemical reaction, intermediate, sensitive process of diazophthoquinon system were studied by laser fluorescence spectrum and laser induced fluorescence attenuation. The nonlinear relation between photodecomposition rate of the system and laser power and concentration of solution was investigated in detail.

论文也进行了感光组成物感激光性能的研究：利用激光荧光光谱及激光诱导荧光衰减法实现了实时探测邻叠氮萘醌型光敏剂感激光光化学过程、中间体的产生与结构以及增感作用的研究，该方法在国内外文献中未见有报道。

Objective To study the modulation mechanism of naphthoquinones on ryanodine receptor in sarcoplasmic reticulum.

目的 研究萘醌-钙通道蛋白的作用机制。

A series of selective acylation of 1'-OH dl-shikonin derivatives and structure simplified derivatives were synthesized.

我们设计并合成了一些消旋紫草素1'位羟基的酯衍生物和结构简化的紫草素萘醌类似物。

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。