酚

In the hydroxylation of phenol with H〓O〓 in the presence of Ti-ZSM-5, water is best solvent. It produces catechol and hydroquinone simultaneously, and catechol/hydroquinone ratio is approximately 0.85. The results show H〓O〓 utilization ratio increase 14%, when nonoxidizable weak acid HAc is added into the reaction system. Under the conditions of Ti-ZSM-5 as catalyst, phenol/H〓O〓 ratio being 10, a little HAc, temperature 75℃, reaction time 6h, H〓O〓 utilization ratio reaches 74. 6mo1% in the reaction.

对Ti-ZSM-5催化苯酚羟基化的研究结果表明，水是最好的溶剂，羟基化有邻、对苯二酚两种产物，并且邻苯二酚/对苯二酚摩尔比可维持在～0.85左右；向反应体系中加入非氧化性弱酸性助剂HAc时，H〓O〓有效利用率较未加入助剂时可提高14mol%；当催化剂用量为8g/100g苯酚、苯酚/H〓O〓比为10、反应温度75℃、添加少量HAc的条件下，反应6h后，H〓O〓有效利用率可达74.6mol%。

The antioxidative action may involve trapping the initiating radicals generated by AAPH in the bulk water phase, trapping the initiating radicals generated by DBHN in the surface of the micelles, inhibiting the propagating lipid peroxyl radicals on the surface of micelles and regenerating α-tocopherol by reducing the α-tocopheroxyl radical.

茶多酚的抗氧化机理可能涉及到在水相中捕获链引发自由基R00·和在胶束表面捕获链引发自由基t-BuO以及在胶束表面捕获链增长自由基LOO和在胶束表面与α-生育酚自由基反应从而再生α-生育酚。

The content of ferulaic acid is least, its range is 0.496～12.566μg·g~(-1), the content in old-growth Chinese fir soil is more than 5μg·g~(-1), and others are less than 5μg·g~(-1). The content of three phenylic acids in 0~20cm depth soil is larger than 20~40cm. Along the ecosystem conversion direction, in 0~20cm and 20~40cm depth soil, the laws of P-hydroxybenzoic acid, ferulic acid and vanillic acid content are complex, does not exist apparent refularity.

其中对羟基苯甲酸含量最大，大小范围为2.233～19.589μg·g~(-1)，其中只有二代杉木人工林的20～40cm层土壤的酚含量小于5，其他的都大于5；香草酸次之，大小范围为0.912～5.683μg·g~(-1)，其中只有天然更新常绿阔叶林的酚含量大于5，其他的都小于5；阿魏酸含量最小，大小范围为0.496～12.566μg·g~(-1)，其中老龄杉木林的0～20cm和20～40cm层土壤的酚含量大于5，其他的都小于5。

The free phosphonic groups shielded most of the Lewis-acid sites on the surface of zirconia and imparted negative charges on the surface at high pH, resulting in excellent resolution for phenols and a great improvement for the separation of benzoic acids.

在该固定相上，酸性化合物的色谱性能得到明显改善，硝基酚、苯二酚等在氧化锆上通常难以洗脱的酚类化合物，均得到了高效分离。

We also studied their inhibition on H2O2,UV-induced hemolysis of RBC. Sodium paeonol sulfonate was used as keep-freshing agent in tomato storage and vitamin C content, brix, acidity, weight loss, membrane permeability, soluble protein content, SOD andPOD activity was determined. The results were as follows: Paeonol and sodiumpaeonol sulfonate had remarkably inhibitory effects on Xanthmonas oryzaepv.oryzicda,Pseudomonas solanacearum Smith, Phyllosticta mali Pril.et Delac.and Rhizoctonia solani Kuhn.

在生物学活性方面，检测了丹皮酚及丹皮酚磺酸钠对植物病原菌的抑制作用，测定了其清除超氧阴离子自由基(O_2~-)、羟自由基的活性及对过氧化氢(H_2O_2)和紫外线诱导红细胞溶血的影响，并用丹皮酚磺酸钠对樱桃番茄进行了保鲜研究，测定贮藏期间番茄的维生素C含量、糖度、酸度、失重率、膜透性、可溶性蛋白含量、超氧化物歧化物及过氧化物活性等。

Leave;phenol content changes in different parts of Pistacia vera L. and P.chinensis Bge in the growth process;phenol extracte, identificate;browning change in cell ultrastructure of the tissue.

其内容包括阿月浑子总酚提取方法，不同组织中的总酚在生长过程中的动态变化；酚类物质的提取、鉴定；褐变发生时组织细胞超微结构的变化。

Wood could be liquefied into soluble reactive intermediates, which could further reactedwith phenol or by themselves. Phenolation and recondensation were a pair of competingreactions. Decomposition, phenolation and recondensation dominated the whole liquefactiondynamic process and determined the structural characteristics of liquefied wood.

4木材组分在液化过程中逐渐分解为较小分子量的液化中间产物，这些中间产物的活性较高，可以继续与苯酚或互相之间发生酚化或再缩聚反应，酚化反应和再缩聚反应是一对互相竞争的反应，降解、酚化和再缩聚三种反应主宰着整个液化动力学过程，也决定着液化产物的结构特征。

This paper reviews pathways of aerobic and anaerobic microbiological degradation of PCP. It can be concluded that reductively dechlorination prior to ring cleavage plays a key role in mineralization of PCP.

文章通过综述好氧与厌氧微生物降解五氯酚的降解菌和降解途径，认为五氯酚首先通过脱氯转化为低氯代化合物后再开环，因此脱氯就成为五氯酚降解的关键步骤。

Plant polyphenols, an excellent natural antioxidant, has been studied extensively, while the extracting techniques of polyphenols, oligoprocyanidms and flavones in the root of sanguisorba haven't been reported in China.

植物多酚是一种优良的天然抗氧化剂，国内外从多个领域、多种角度对植物多酚进行了广泛的研究工作，而对地榆中多酚、低聚原花青素以及黄酮浸提工艺研究国内尚未见报道。

A mathematical model of the relation between ethanol concentration, solid-liquid ratio, time of ultrasonic wave and the extraction ratio of polyphenol in oil-tea seed residue has been established by means of quadratic general rotary unitize design and ultrasonic wave cooperated method.

采用二次通用旋转组合设计试验方法和超声波辅助提取工艺方法，建立了乙醇浓度、料液比、超声时间与油茶籽饼多酚类物质提取率之间的数学模型，绘制了单工艺参数、双工艺参数与多酚提取率之间的函数图像，得出了多酚类物质提取的最佳工艺。

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。