二酸

To understand the possible influence of jasmonates on pollen germination,the effects of dihydrojasmonic acid and methyl jasmonate on sponge gourd and rape pollen germination were investigated.

为进一步探查茉莉酸类植物激素对花粉萌发的影响，研究二氢茉莉酸和茉莉酸甲酯对丝瓜和油菜花粉萌发的效应。

Sponge gourd and rape pollens from spikelets of natural anthesis were harvested and immediately spread onto pollen germination mediums with or without DHJA or MeJA of different concentrations.

为进一步探查茉莉酸类植物激素对花粉萌发的影响，研究二氢茉莉酸和茉莉酸甲酯对丝瓜和油菜花粉萌发的效应。

The measuring principle, design method and configuration of the system are introduced. Then, the measuring system is calibrated by testing Lead Zirconate Titanate ceramic and Lithium Tantalate crystal with the known pyroelectric coefficients as the references. In addition, the pyroelectric coefficients of several common ferroelectric thin films such as PZT, PVDF (poly-vinylidene fluoride) and BST are tested.

介绍了该系统的测量原理、设计方法及组成，用已知热释电系数值的锆钛酸铅陶瓷及钽酸锂单晶作为参考样品对系统进行了调试，并对PZT、聚二氟乙烯及钛酸锶钡等几种常见的铁电薄膜材料的热释电系数进行了测试。

The physicochemical properties, fatty acid composition and mineral elements of Viburnum cylindricum seed oil were determined. The results showed that 20 kinds of fatty acids in the Viburnum cylindricum seed oil were identified, in which the main components were oleic acid (33.34%), 8,11-octadecadienoic acid (28.24%) and palmitic acid (22.55%); the seed oil contained 6 kinds of essential mineral elements including Ca, P, Mg, Fe, K and Mn, and their contents were in the reasonable range of body requirement.

测定了水红木油的理化指标；用GC/MS法测定了脂肪酸组成及含量，共检出20种脂肪酸，主要成分9-十八碳烯酸占33.34%，8，11-十八碳二烯酸占28.24%，十六烷酸占22.55%，3种脂肪酸共占84.13%；用ICP-OES法测定了矿质元素的种类和含量，检出的Ca、P、Mg、Fe、K、Mn 6种矿质元素均为人体必需元素，含量均在人体所需合理范围内。

Seven compounds have been isolated from hard coral Acropora pulchra. These compounds are:pentadecoic acid, heptadecyl ester;(2)n-cetanol;(3)batyl alcohol;(4) N- [ 1 --2-hydroxyl--3,7-heptad-ecadienal] -hexadecanamide;(5)1 -0-hexanoyl-glycerol ester;(6)thymine;(7)uracil. Their structures were determined by IR, MS, HNMR, 13CNMR analysis.

从北海佳丽鹿角珊瑚Acropora pulchra乙醇提取液的乙酸乙酯部分分离出七个化合物，经IR、MS、~1HNMR、~(13)CNMR等波谱方法鉴定，其结构分别为：(1)十五酸十七酯，(2)正十六碳醇，(3)鲨肝醇，(4)N-1-羟基甲基-2-羟基—-3，7-十七碳二烯基十六酸酰胺，(5)1-正十六酸甘油酯，(6)胸腺嘧啶，(7)尿嘧啶。

The method is simple, rapid, and accurate, and is suitable for the determination of melamine, ammeline, ammelide, and cyacuric acid in milk and milk powder.

该方法简便、快速、准确，可满足牛奶及奶粉中三聚氰胺、三聚氰酸、三聚氰酸一酰胺、三聚氰酸二酰胺测定的需要。

A HILIC-MS/MS method was developed to determine melamine and its three derivatives, cyanuric acid, ammelide and ammeline in milk and milk powder. The milk sample was directly extracted by acetonitrile with the help of ultrasonic, and milk powder was resolved in water before extraction by acetonitrile.

建立了牛奶和奶粉中三聚氰胺及其3种衍生物（三聚氰酸、三聚氰酸一酰胺、三聚氰酸二酰胺）的亲水色谱－串联质谱检测方法(HILIC-MS/MS)。

After centrifugation, the extracts were separated on HILIC column by using acetonitrile-water as mobile phase. The analytes were identified and quantitated by LC-tandem MS under the positive/negative electrospray ionization and multiple reaction monitormode. The calibration curves showed good linearity in the range of 25-5000 μg/kg for melamine and cyanuric acid, and 50-10000 μg/kg for ammeline and ammelide. The limits of detection and limits of quantification were in the range of 5-20 μg/kg and 50-100 μg/kg, respectively.

牛奶样品直接用乙腈超声波提取；奶粉样品先用水溶解后再加乙腈超声波提取，高速离心后以乙腈－水为流动相，采用亲水作用色谱柱分离这4种化合物，在电喷雾正、负电离切换多反应监测模式下进行定性与定量分析，三聚氰酸一酰胺与三聚氰酸二酰胺含量在50~10000μg/kg之间、三聚氰胺与三聚氰酸在25~5000μg/kg之间，均获得良好的线性。

Discussion Diphenylacetic acid can be prepared by the reduction of benzilic acid with hydriodic acid and red phosphorus,1 by carbonation of the reaction product of phenylsodium and diphenylmethane,2 and by hydrolysis of 1,1-dichloro-2,2-diphenylethylene.3

讨论 Diphenylacetic酸可编写的减少benzilic酸hydriodic酸和红磷， 1碳化反应产物phenylsodium和二苯基甲烷，第2和水解1，1 -二氯- 2 ，2 - diphenylethylene 0.3

A process for the carbonylation of allylic butenyl ether (for example, methyl crotyl ether, 3-methoxybutene-1 and mixtures thereof) or mixture of butadiene and alcohol and production of beta-gamma unsaturated carboxylic acid esters (for example, methyl-3-pentenoate) utilizing a rhodium-containing catalyst for example, dicarbonylacetylacetonate rhodium(I or the like promoted with an iodide-containing compound (for example, HI, AlI3, SnI4, TiI4, CrI3, and CoI2 or the like).

一种将烯丙型丁烯基醚(如甲基巴豆基醚、3－甲氧基丁烯－1及其混合物)或者丁二烯与醇的混合物羰基化的方法，以及由含碘化物化合物(如HI、AlI3、SnI4、TiI4、CrI3和CoI2或等效物)促进，用含铑催化剂如二羰基乙酰丙酮酸铑(I或其等效物制备β－γ不饱和羧酸酯(如甲基－3－戊烯酸酯)的方法。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。