问题 问答题 简答题

简述血清总钙和离子钙测定原理。

答案

参考答案:

(1)血清总钙测定原理:是利用血清中的钙离子在碱性溶液中可与染料结合生成有色物质来测定。常用染料有甲基麝香草酚蓝(MTB.和邻甲酚酞络合酮(OCPC.。同时在试剂中加入8-羟基喹啉,可以消除镁离子的干扰。而偶氮砷Ⅲ法则是利用在中等酸度(pH值约为6)时偶氮砷Ⅲ与钙离子的亲和性远大于镁离子的特性来测定。

(2)离子钙测定原理:采用离子选择电极法测定。钙离子选择电极包括一层含有内置参考电极的钙离子选择膜和氯化钙内部参考溶液。该内部参考溶液常常含有饱和氯化银和生理浓度的氯化钠和氯化钾。外置参考电极与样品通过液体-液体或氯化钾/甲酸钠盐桥连接组成化学电池。根据能斯特(Nernst)方程,电池两侧的电位差与离子钙浓度的对数成正比。

阅读理解

阅读理解。

     It's reported that a company called MicroCHIPS has developed awirelessly controlled device

(装置). The device is put under the skinand can supply a drug directly into the patient's body.

People give the name"microchips"to it.

     Microchips bring good news to patients with long-term(长期的) illnesses, for example,

Osteoporosis(骨质疏松症). People with Osteoporos is have to get daily injections(注射) of

medicine. One type of treatment requires injections for two years. Many patients stop taking the

medicine because of the pain and stress of theinfections. However, microchips can deal with it.

Doctors will program the device before putting it under the skin, and the device has the ability to

release(释放) a dose (剂量) at a given time, every single day. One microchip can hold a full year's

worth of medicine. Microchips may one day free (使…… 摆脱) people from having toremember

to take their medicine, or get injections. The device may also be useful in treating other long-term

diseases, including heartdisease, cancer and even AIDS.

1. What is the passage mainly about?

A. It introduces the company MicroCHIPS.

B. It introduces a new wirelessly controlled device called"microchips".

C. It introduces some common long-tern diseases.

D. It's about how the device called"microchips"works.

2. According to the passage, why do many patients stop getting injections?

A. Because of the pain and stress of the injections.

B. Because they are too lazy.

C. Because they like taking pills(药丸).

D. Because they are waiting for the new device. 

3. According to how the device works, which of the following is the correct order?

① Put the device under the skin.

② The device releases a dose at a given time.

③ Doctors program it.

A. ①②③

B. ②③①

C. ③①②

D. ③②①

多项选择题