查询词典 acid-base

Hexadecanoic acid,stearic acid,oleic acid,linoleic acid and linolenic acid from soybean salad oil have been quantitatively analyzed by using gas chromatograph combined with,Heated-filament pyrolyzer and Curie-Point pyrolyzer.

方法采用气相色谱仪，FID检测器，FFAP毛细柱，热丝型裂解器及居里点裂解器，对大豆色拉油的五种主要组分：软脂酸，硬脂酸，油酸，亚油酸，亚麻酸进行了定量分析。

Tetrachloroterephthalic acid was prepared by chlorinating terephthalic acid, oleumsolvent and iodine catalyst. Tetrachloroterephthalic acid was acylated by sulphurous oxychloride in the presence of DMF to form tetrachloroterephthaloyl chloride. The acyl chloride product was fluorinated by potassium fluoride and esterified by methanol to synthesize dimethyl tetrafluoroterephthalate. The ester was reduced with potassium borohydride and lithium chloride to give tetrafluoroterephthalyl alcohol. The above product was bromated in the hydrobromic acid to obtain 4-bromomethyl-2,3,5,6-tetrafluoro-benzene methanol. 4-Methyl-2,3,5,-6-tetrafluorobenzene ethanol was obtained by reducing the bromide with magnesium. In the exist of DCC and DMAP, tefluthrin was got by the condensation reaction between 4-methyl-2,3,5,6-tetrafluoro-benzene methanol and-(1RS,3RS)- 3-(2- chloro-3,3,3-trifluoro-1-propenyl)-2,2-dimethyl cycolpropanecar-boxylate acid.

对苯二甲酸与氯气在碘存在下以发烟硫酸为溶剂进行氯化制备四氯对苯二甲酸；再以DMF为催化剂与二氯亚砜反应生成四氯对苯二甲酰氯；以氟化钾为氟化剂，环丁砜为溶剂置换氟化，再与甲醇酯化得到四氟对苯二甲酸甲酯；以KBH4-LiCl为还原剂二甲醚为溶剂反应制得四氟对苯二甲基苄醇；以氯苯为溶剂在溴化氢溶液中溴化得到溴化产物；在乙醇溶液中经镁粉还原得到4-甲基-2，3，5，6-四氟苄醇；甲基苄醇与功夫酸在催化剂二环己基碳二亚胺和4-二甲氨基吡啶作用下缩合得到七氟菊酯，总收率达43.6%。

It indicates that the raw materials can be stored in temperature of 0-4℃ for 60 days, they must be immersed in clean water for more than one hour before processing, and peeling be carried out in flowing water; that color preserving solution should be 1.0% NaCl+0.2% citric acid+0.5% Vitamin C+110ppm dichloro isocyanuric acid sodium; that combined browning inhibiting solution is conspicuously effective, and immersion time better be around 20 minutes; that sterilization solution ought to be 200ppm dichloro isocyanuric acid sodium+0.5% ascorbic acid+0.3 citric acid, and 10 minutes' immersion will achieve the effect of sterilization and inhibiting browning; and that after 20-21 minutes of quick-freezing in temperature of -31℃~-32℃, the products can be preserved under -18℃ for a whole year.

通过对速冻牛蒡加工过程中原料储存、削皮方法、护色、浸泡时间、无热杀菌、包装形式等参数进行研究表明：原料0-4℃可储存60天，加工前用清水浸泡1小时以上，削皮时在流水中进行，护色液筛选的1.0% NaCl＋0.2%柠檬酸＋0.5%维生素C十110ppm二氯异氰脲酸钠；复合褐变抑制溶液在抑制褐变方面有显著的效果，浸泡处理时间为20分钟为宜；杀菌液为200ppm二氯异氰脲酸钠＋0.5%抗坏血酸＋0.3柠檬酸，浸泡10分钟即可达到灭菌和抑制褐变的作用；经-31℃~-32℃温度下速冻20~21分钟，产品在-18℃条件下可储存一年。

For different mixed ferment time, Sensory assessing was not different obviously;pH value,DM,CP,NDF,ADF content were all katabatic or decreasing with extending of mixed silage time; NH3-N/tN%and lactic acid ,acetic acid, propionc acid and butyric acid concentrations were increased gradually,butproportion of lactic acid was the most in total acids.

2不同发酵时间的感官评定结果无明显差别；pH值、DM、CP、NDF和ADF随发酵时间延长均逐渐降低或减少；NH3-N/tN%、乳酸、乙酸、丙酸和丁酸均逐渐增加，但以乳酸占总酸比例最大。

Saturated fatty acids in the two genotype pigs mainly included stearic acid and palmitinic acid. But unsaturated fatty acids mainly included oleinic acid、linolic acid and palmitoleic acid.

荣昌猪和DLY猪肌内脂肪酸组成中饱和脂肪酸主要为硬脂酸和棕榈酸，不饱和脂肪酸主要为油酸、亚油酸和棕榈油酸，其它脂肪酸则较少。

As for acetalation, we research the effects of acid kinds, acid quantity, temperature solvents on it and get the conclusions that the optimized acid is sulfuric acid, the optimized temperature is 65 °C, the reaction time is five hours, and the material ratio of sulfuric acid to methylglyoxal to methanol is 0.028:1:6.837.

在醛保护一步中，研究了酸种类、酸用量、温度及其溶剂的影响，得到了本反应的较好条件是：酸为浓硫酸，反应温度为65℃，反应时间为5小时，浓硫酸：丙酮醛：甲醇的配比为0.028：1：6.837，反应收率可达81%。

The five halogenated acetic acids, monochloroacetic acid, dichloroacetic acid, trichloro acetic acid, monobromoacetic acid, dibromoacetic acid, were separated on an IonPac AS19 column specially designed for oxyhalides, and the separating conditions were optimized.

利用IonPac AS19大容量阴离子交换色谱柱对水中的一氯乙酸、二氯乙酸、三氯乙酸、一溴乙酸、二溴乙酸5种卤代乙酸进行了分离，优化了分离条件。

The results showed that myristic acid(14∶0) and linoleic acid (18∶2) were significantly increased,and positively correlated with the levels of TC, TG, LDLC and apoB;while the levels of docosahexaenoic acid (DHA,22∶6),arachidonic acid (20∶4) and docosatetraenoic acid (22∶4) an...

结果表明：患者肉豆蔻酸（140）和亚油酸（182）明显增高，与总胆固醇、甘油三酯、低密度脂蛋白－胆固醇和载脂蛋白B水平呈正相关；而二十二碳六烯酸（DHA，226）、二十碳四烯酸（AA，204）和二十二碳四烯酸（224）以及硬脂酸（180）明显降低，与TC、TG、LDL－C和apoB水平呈负相关。

BHD. Production of fatty acids (such as stearic acid, lauric acid, myristic acid, palmitic acid, oleic acid, etc.), glycerin, soap, EBS, 6501 chemical products such as oils and fats.

生产的脂肪酸（如硬脂酸、月桂酸、肉豆蔻酸、棕榈酸、油酸等）、甘油、皂基、EBS、6501等油脂化工产品。

MPH plastic magnetic pump complies with JB/T7742-1995Standard for Small Magnetic Transmission Centrifugal Pump. Its flow-through parts adopt PPS with corrosion resistance to most acid, alkali and salt (except oxidable acid like strong sul-furic acid, nitric acid and aqua regia). Its performance is close to the chemical performance of F4, which can resist to most organic solvents under 100℃, especially to the mixture of gas and carbinol. Thus it is an ideal pump for acid and alkali industries.

MPH型塑料磁力泵符合JB/T 7742-1995《小型磁力传动离心泵》标准，过流部件采用聚苯硫醚，不受大多数酸、碱、盐的侵蚀(除氧化性酸如浓硫酸、硝酸和王水等)，其性能接近于聚四氟乙烯的化学性能，在100℃以下能耐大多数有机溶剂，特别能耐汽油和甲醇的混和液，是酸碱工业中的理想用泵。

Fancy gold-plated dangling earrings with facetted White Opal crystals.

花式镀金悬垂耳环与facetted白欧泊水晶。

This essay chooses the study aim from biology teachers in middle school in Shi Jiazhuang which tells us that most of the middle school biology teachers in Shi Jiazhuang have the"burnout", lower successfulness, individualize.

本文选取石家庄市初中生物教师作为研究对象，运用问卷调查的方法对石家庄市初中生物教师职业倦怠的现状进行调查，调查结果发现，石家庄市初中生物教师这一群体普遍存在职业倦怠，情感枯竭程度偏高，成就感偏低，去个性化程度最为严重。