查询词典 hydroxybenzoic acid

By reactions of p-hydroxybenzoic acid with the chlorides of adipic acid, suberic acid, sebacic acid and 1,10-decanedicarboxylic acid respectively four new diacids, and then their dich-lorides, were obtained. The four diacids were found to be thermotropic.

将己二酸、辛二酸、癸二酸、1，10-十二烷基羧酸经酰氯化后，分别与对羟基苯甲酸合成，得到了四种二元羧酸以及与其相应的四种二元酰氯，并发现前者具有热致液晶性。

Result: Eight compounds were isolated from ethanolic extract of the brown alga D.divaricata and their structures were identified as-torreyol,4β,5α-dihydroxycubenol,3-farnesyl-p-hydroxybenzioc acid,chromazonarol,fucosterol,phenyl acetylamine,4-hydroxybenzoic acid and n-hexadecanoic acid.

结果：从叉开网翼藻中分离得到8个化合物，分别鉴定为-torreyol，4β，5-αdihydroxycubenol，3-farnesyl--phydroxybenzioc acid，chromazonarol，岩藻甾醇，苯乙酰胺，4-羟基苯甲酸和正十六酸。

Butyl p-hydroxybenzoate was synthesized from p-hydroxybenzoic acid and butanol with sulfoacid resin as catalyst. The optimum conditions were as follow: ratio of n-butanol, p-hydroxybenzoic acid and sulfonic acid resin was 0.25 mol ∶ 0.05 mol ∶ 1.5 g, refluxing for 5 h using water separator at the reflow reaction temperature.

摘 要：以对羟基苯甲酸和丁醇为原料，用磺酸树脂作催化剂，催化合成了尼泊金丁酯，优化反应条件为：n∶ n=5 ∶ 1，催化剂磺酸树脂的用量为对羟基苯甲酸质量的21%，反应温度为回流温度，反应时间为5 h。

There weremainly p-hydroxybenzoic acid,vanillic acid,and syringic acid in soybean root exudates.Vanillicacid,syring acid and ferulic acid were found in soybean shoots.The soybean roots containedvanillic acid and p-coumaric acid.

大豆根分泌物中主要含有对羟苯甲酸、香草酸和丁香酸，而大豆植株地上部主要含有香草酸、丁香酸和阿魏酸，根部以香草酸和香豆酸为主。

The results showed that in the growth period of R. glutinosa, soil ferulic acid, vanillic acid, and vanillin contents had a persistent increase, while β-hydroxybenzoic acid content increased first but decreased then. The addition of ferulic acid (8 μg·ml-1), vanillic acid (08 μg·ml-1), vanillin (12 μg·ml-1), and β-hydroxybenzoic acid (30 μg·ml-1) in water culture had stronger inhibitory effects on R. glutinosa root length, root mass, fresh plant mass, and plant height. Treating with test phenolic acids except β-hydroxybenzoic acid increased leaf chlorophyll content significantly, compared with the control. After treated with test phenolic acids, plant SOD and POD activities decreased after an initial increase, and plant malondialdehyde content increased. In the treatment of ferulic acid, root SOD and POD activities were the lowest, and roots were rotted and dead.

结果表明：阿魏酸、香草酸和香草醛含量在地黄生长期表现为持续增加，而对羟基苯甲酸含量先升高后降低；外加阿魏酸（8 μg·ml-1）、香草酸（0.8 μg·ml-1）、香草醛（1.2 μg·ml-1）和对羟基苯甲酸（3.0 μg·ml-1）对水培地黄根长、根质量、全株鲜质量和株高有较强的抑制作用；酚酸处理使地黄叶片叶绿素含量降低，除对羟基苯甲酸外差异性极显著；经过酚酸处理的地黄幼苗SOD和POD活性为先升高后下降，丙二醛含量升高，其中阿魏酸的处理使根中酶活性降至最低，根部腐烂死亡。

They were two new compounds, [cyclo(Pro-Val-Phe-Phe-Pro-Val-Phe-Ser-Leu),7],[2-N-(1-methoxycarbonylethyl)guanosine, 10], and eight known compounds,(p-hydroxybenzoic acid, 1),(methyl succinate, 2),(russulaceramide, 3),(phenylalanine, 4),(guanine, 5),(β-carboline, 6),(uridine, 8), and (adenosine, 9). All the compounds were isolated from Amanita exitialis for the first time.

分别为：对羟基苯甲酸(p-hydroxybenzoic acid，1)、丁二酸二甲酯(methyl succinate，2)、神经酰胺(russulaceramide，3)、苯丙氨酸（phenylalanine，4）、鸟嘌呤核苷(guanine，5)、β-咔啉(β-carboline，6)、环（脯氨酸-缬氨酸-苯丙氨酸-苯丙氨酸-脯氨酸-缬氨酸-苯丙氨酸-丝氨酸-亮氨酸） [cyclo(Pro-Val-Phe-Phe-Pro-Val-Phe-Ser-Leu)，7]、尿嘧啶核苷(uridine，8)、腺嘌呤核苷(adenosine，9)、2-N-(1-甲氧羰基乙基)鸟苷[2-N-(1-Methoxycarbonylethyl)guanosine， 10]。10个化合物均为首次从致命鹅膏中分离得到，其中化合物7和10为新化合物。

To evaluate the allelopathy effects of benzoic acid and ρ-hydroxybenzoic acid on watermelon, this paper studied the effects of benzoic acid and ρ-hydroxybenzoic acid on watermelon seed germination and seedling growth by seed soaking, seed-bud soaking and seedling irrigation.

为探明苯甲酸、对-羟基苯甲酸对西瓜的化感作用，采用浸种、浸芽和浇灌幼苗的方法分别研究了苯甲酸、对-羟基苯甲酸对西瓜种子发芽和幼苗生长的影响。

The separation behavior of o hydroxybenzoic acid, m hydroxybenzoic acid and p hydroxybenzoic acid in high performance capillary zone electrophoresis was investigated using cetyltrimethylammonium bromide as reversed reagent for electroosmotic flow The effects of pH of buffer solution and volume fraction of methanol on the separation, peak shape and elution order were studie

采用十六烷基三甲基溴化铵为电渗流改性剂，考察了邻羟基苯甲酸、间羟基苯甲酸和对羟基苯甲酸在高效毛细管区带电泳模式下的分离行为，研究了缓冲液的pH和添加剂甲醇的用量对这 3种同分异构体的分离、峰形和出峰顺序的影响，并据此优化了这 3种异构体的分离条件。

Most sugars, organic acids, phenolic acids and most amino acids increased significantly with elevated CO_2. The treatment, 950±50μmol·mol-1 CO_2 enrichment for 6 h every day had more obvious effects than the treatment, 950±50μmol·mol-1 CO_2 enrichment for 3 h every day. Levan, sucrose, arginine, oxalic acid, alanine, malic acid, acetic acid, lactic acid cinnamic acid,ρ- hydroxybenzoic acid and benzoic acid increased significantly.

CO_2施肥黄瓜根系分泌有机酸、氨基酸、糖和酚酸的总量增加，上、下午均施肥的处理分泌数量最多；CO_2施肥显著促进了果聚糖、蔗糖、草酸、苹果酸、乙酸、乳酸、多数氨基酸、肉桂酸、对羟基苯甲酸和苯甲酸等组分的分泌；单位鲜重根系分泌糖和酚酸的数量增加，多数氨基酸保持不变或降低，但有机酸分泌规律不一致。

Mouse monoclonal antibodies against salicylic acid was produced and characterized for the first time. The McAb S2-8F, were derived from an immunogen in which 5-aminosalicylic acid (5-ASA) was conjugated to KLH (hemocyanin from keyhole limpets) through its -NH〓 group. The antibody showed high specificity to SA and even more high specificity to 5-ASA (the cross-reaction is 144. 8％), but very little cross-reactivity with 5-sulfosalicylic acid (0.9％) and 4-aminosalicylic acid (0.3％). Other compounds structurally similar to SA, such as 4-hydroxybenzoic acid, 4-aminobenzoic acid and salicylaldoxime, were not found to exhibit any cross-reactivity.

以5-氨基水杨酸(5-aminosalicylic acid，5-ASA)的5位氨基为偶联位点，血蓝蛋白(hemocyanin from keyhole limpets，KLH)为载体合成了SA-NH-CH〓-NH-KLH，以此为免疫原免疫小鼠，利用杂交瘤融合技术得到三株可产生针对SA抗体的细胞株，并对其中编号为S2-8F的细胞株产生的单克隆抗体的特性进行了研究，发现它对SA和5-ASA具有高亲和力。

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。