光度测定

The feeding and excretion of three little fishes (Hemiculter. leucisculus, Tilapia. aurea and Cirrhinus. molitorelld) was studied and their effect on water quality of Qiankeng reservoir in Shenzhen City Around the topdown effect of fish was also studied. Based on the analysis of their stomach contents, their diet composition was assayed. The three fishes" feeding rhythm in cage and their rate of digestion indoor were looked into, and their daily ration was estimated through the method of daily average fullness index. Using the spectrophotometer, the content of chlorophyll a in the stomach was measured, and the feasibility of taking the chlorophyll a as an index of measuring the feeding of fish on phytoplankton was studied. Adopting the national standard method, the effect of the three fishes" excretion on total nitrogen, total phosphorus, CODMn, pH, turbidity and conductivity coefficient was surveyed. The effect of feeding and excretion offish on water quality was discussed and the results revealed as follows:H.

围绕鱼类的下行效应，本文以深圳茜坑水库三种小型鱼类Hemiculter leucisculus罗非鱼Tilapia.aurea和鲮鱼Cirrhmus.molitorella为研究对象，以胃含物分析为基础，分析了三种鱼类的食物组成；调查了网箱中自然状态下三种鱼的摄食节律，在室内调查了三种鱼的食物消化速率，运用日平均饱满指数法计算出三种鱼的日粮；采用分光光度法测定了鱼体肠叶绿素含量，探讨了叶绿素作为鱼类对浮游植物摄食量衡量指标的可行性；采用国家标准的水质测量方法，测定了鱼类排泄对总氮、总磷、高锰酸盐指数、pH、浊度和电导率的影响量。

The method of using formaldehyde buffer solution a b sorption-hydrochloric pararosaniline spectrophotometry to determine sulfur diox ide in air has higher sensitivity and good selectivity,and prevents from adoptin g mercurial absorbent.But the conditions in lab are not well controlled,the v alue of reagent blank and standard curvilinear slope can't accord with the one s tipulated in"Methods for Air and Waste Gas Monitoring and Analysis".Some opra tional techniques for SO2 determination in lab are introduced for reference.

文摘：以甲醛缓冲溶液吸收-盐酸副玫瑰苯胺分光光度法测定空气中的二氧化硫，方法灵敏度高，选择性好，避免了使用含汞的吸收液，但如果实验条件控制不好，试剂空白值及标准曲线的斜率就会不符合《空气和废气监测分析方法》中规定的值，本文着重从操作技巧方面对二气化硫测定的实验室质量控制进行分析，仅供参考。

The optimum experimental condition for simultaneous UVspectrophotometric determination of the contents of aspirin, phenacetin and caffeine in aspirin compound tablets and the basic principle

本文研究了复方阿斯匹林片中阿斯匹林、那西丁和咖啡因含量同时测定的紫外分光光度法的最佳实验条件，并简述偏最小二乘法多组分同时测定中的基本原理和应用。

Methods The activity was determined by 3 - phosphoglycerate as substrate, the enolase and a series of coupling to 340 nm wave-length automatic analyzer in the determination of total activity could be derived.

PGAM活性测定采用3-磷酸甘油酸为底物，经烯醇化酶等一系列偶联，以340 nm波长在自动分析仪上测定，根据NADH吸光度变化可求出PGAM总活性。

Weight loss method,extraction and absorption photometry were adopted,the measurement results of these means were compared.

采用减量法、萃取法以及吸收光度法进行了组分测定，对比各方法的测定结果。

During the course of the experiment, the student will be exposed to fractional distillation under vacuum, gas chromatography, refractometry, polarimetry, and IR absorption spectroscopy.

气相色层分析，折光率的测定，旋光度的测定和红外吸收光谱。

The left carotid artery was expose and placed over an ultrasonic flow probe.The brain flow volume was recorded with an ultra-sonic volume meter.The pursiness time of mice was observed to evaluate the effect of tianma xingnao capsule on cere-bral ischemia and anoxia.Methods The permeability of normal blood-cerebral barrier was investigated in mice.

目的 应用二道血流速度流量仪超声探头测定大鼠颈总动脉，以反映云南省昭通制药有限公司提供的天麻醒脑胶囊对脑血流量的影响；方法记录小鼠断头后张口喘气时间，观察天麻醒脑胶囊的抗脑缺血缺氧作用；小鼠尾静脉注射Evans溶液，测定脑组织Evans的吸光度以反映药物的血脑通透性。

The content of total flavonoids and tannin in common purslane was determined with ethanol extraction and spectrophotometry method.

方法］采用乙醇浸提法测定马齿苋中类黄酮含量，并用分光光度法测定马齿苋中单宁的含量。

Methods Spectrophotometric method was used to detect the total flavonoids, and HPLC was used to determine quercitrin and analyze the characteristic peaks of Fingerprint.

以总黄酮、槲皮苷含量结合指纹图谱主要特征峰面积保留率为考察指标；采用可见分光光度法测定总黄酮含量，HPLC法测定槲皮苷含量，HPLC法分析指纹图谱主要特征峰面积。

A new method for determination of oleanolic acid in chinese quince by thin layer chromatography-spectrophotometry was established.

建立测定木瓜中齐墩果酸的薄层色谱-分光光度法的新方法，用薄层色谱分离杂质，优化了分析条件，讨论了影响测定的因素。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了