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It is prepared from pentachluorobenzonitrile by using KF as fluoride to substitute chlorine in the presence of benzonitrile under high temperature. But owing to the low solubility of KF and rigor synthesis condition, and the parallel auxiliary reactions, the speed of reaction as well as the yield is very low.

五氟苯甲腈的合成开发以五氯苯甲腈为原料在较高的温度下用氟化钾做氟化剂,通过取代苯环上氯原子而得到的,由于氟化钾在溶剂中溶解度低,合成条件要求苛刻,反应速度较慢,同时存在有平行竞争副反应,因而反应收率较低,国内尚无厂家生产。

In general, it seems that the field margin and woodland were much fitter for carabid living than cropland; and it was beneficial to protect and establish such habitat for the biodiversity in agro-ecosystem.3 Because of the long-term intensively agricultural land using and rapid urbanization, the vegetation in the Dongbeiwang village was extremely homogeneous.

不同的生境类型下步甲群落的个体数量差异很大,农田生境中步甲群落个体数量都较低,林地和农田边界地带较高;不同土地利用类型下,步甲群落的物种数量也有显著差异,农田边界处步甲群落的物种数量最多,其次为林地和与边界相邻的农田,而农田中出现的物种数量最少。

With continuous culture in laboratory, this paper studied the individual's growth and population dynamics of Paramecium caudatum under the stress of methamidophos, fen-propathrin and 2, 4-D buiylate, with the population growth curves analyzed by using Logistic model.

采用连续培养法探讨了草履虫在甲胺磷、2,4-D丁酯和甲氰菊酯3种农药胁迫条件下的个体生长和种群动态,并利用Logistic种群增长模型对种群的增长曲线进行了分析。

Off-line HPLC coupled with MS gives the result that 4-chlorophenyl urea and 2-chloro-N-(4-chlorophenyl) benzamide are two photoproducts. In comparison with their retention times and UV specta with those of standards, some other photoproducts identified are 2-chloro benzamide, 4-chlorophenyl urea and 4-chloro aniline.

收集光解产物各级分,采用直接进样法在MS上测得其中的二种光解产物为对氯苯基脲和N-邻氯苯甲酰胺:通过与标样在同样HPLC条件下的保留时间和UV吸收光谱相对照,证明产物中存在有邻氯苯甲酰胺、对氯苯基脲和对氯苯胺等。

In order to explore the feature of Diarrhetic shellfish poisoningproduction and elucidate the complicate mechanism of DSP biosynthesis, production of DSP in different growth phases in Prorocentrum lima and under different nutrients conditions was investigated by ELISA.

为了解海洋底栖甲藻——利玛原甲藻的产毒特征,阐明腹泻性贝毒(Diarrhetic shellfish poisoning, DSP)复杂的生物合成机制,采用酶联免疫试剂盒,对利玛原甲藻不同生长期、不同营养盐条件下毒素生成情况进行了研究。

Phaeocystis cells are separated experimentally form the water samples collected in Bohai Phaeocystis blooms in 2005.Plate and dilution was used to separate and culture the Phaeocystis cells from the Bohai water samples; Its ecological properties of growth was studied in this research; The break effect of ultrasonic and freezing method was compared in the breaking treatment of Gymnodinium spp. cells of different periods.

该研究选用平板法和稀释法对渤海棕囊藻赤潮期间水样中的微藻进行了分离培养实验;系统研究了裸甲藻在实验室条件下的生态学特征;考察了超声波法和冻融法对不同生长时期裸甲藻细胞的破碎效果;运用高效液相色谱对裸甲藻和链状亚历山大藻细胞提取物进行了麻痹性贝毒的分析检测。

The harmful algal blooms has been global questions.In the case of much break out of HAB in China sea this research is done. Under the experiment conditions, the ecological growth properties of Gymnodinium spp.

首先在实验室条件下对裸甲藻的生态学生长特性进行考察,然后从有毒赤潮藻细胞(裸甲藻、链状亚历山大藻)提取毒素,使用高效液相色谱进行定性、定量分析。

According to the location of pneumatization, pneumatized inferior turbinates were classified into three types : bulbous, lamellar, and extensive types.

HRCT是显示下鼻甲气化的最佳方法,可直接作出诊断并能帮助临床与其他原因造成的下鼻甲肥大进行鉴别。

Results The most common (48.78%) infected type was distal and lateral subungual onychomycosis, infected patients were more fingernails than toenails.

结果 儿童甲真菌病最常见的感染类型是远端侧缘甲下型,指甲感染者较趾甲感染者常见。

The main subtypes of onychomycosis are distal lateral subungual onychomycosis, white superficial onychomycosis, proximal subungual onychomycosis, endonyx onychomycosis, and candidal onychomycosis.

甲真菌病的主要亚型是远端外侧甲下甲癣(康乐事务办事处或DSO),白色表面的甲真菌病,近端甲下甲真菌病的,endonyx甲真菌病和念珠菌甲癣。

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The concept of equivalent rotationally rigidity is offered and the formula of rotationally rigidity is obtained.

主要做了如下几个方面的工作:对伸臂位于顶部的单层框架—筒体模型进行分析,提出了等效转动约束的概念和转动约束刚度的表达式。

Male cats normally do not need aftercare with the exception of the night after the anesthetic.

男猫通常不需要善后除了晚上的麻醉。

Its advantage is that it can be used in smaller units.

其优点在于可以在较小的单位中应用。