What experiments have used alcohol in biological experiments? Ask for a summary

All cell-related and microbial-related experiments require the use of alcohol for disinfection.

In summary, it is needed for all experiments that require aseptic manipulation, as well as when the preparation of glass slides needs to be overheated.

Dissolved organic matter, such as chlorophyll extraction.

The concentration of different alcohols can be used for the following:

1. Alcohol above the volume fraction can be extracted from chloroplast middle gyrus.

The concentration of different liquor extracts can be used to attack the next aspect:

1. Alcohol with more than the body fraction can extract the pigment zhi in chloroplast

2. Volume fraction 70% 75% alcohol with DAO

1. Alcohol with a volume fraction of 50 percent.

Purpose: Washes away floating color.

2. Alcohol with a volume fraction of 95%.

Purpose: Dissociation;

Precipitate and extract DNA with less impurities.

3. Alcohol with a volume fraction of 75%. Repentance.

Function: Sterilization of tung poison before potato elimination.

4. Anhydrous alcohol.

Purpose: Pigment extraction.

5. Industrial alcohol (generally alcohol with a volume fraction of 95 percent) Effect: combustion heating.

High School Chemistry Experiments.

What are the methods? Precautions for doing experiments.

We have been learning chemistry since the seventh grade, but the children who have learned it should know that they are only exposed to chemistry in junior high school, and they only start to really learn chemistry in high school, but when they learn chemistry, they will do experiments, and what are the ways to do experiments?

Chemistry experiments. As long as you study this subject, you will inevitably have a situation of doing chemistry experiments, and what are the methods of high school chemistry experiments.

1. Methods of controlling variables.

In experiments or practical problems, there are often many factors that change, resulting in patterns that are not easy to appear. The premise is that you control the variation of the range, and then study the influence and utilization of one factor in turn.

For example, the properties of gases, pressures, overall areas, and air temperature often change together. We can control one state parameter to remain invariant, find the relationship between the other two parameters, and then unify them. And some of the theorems that people before us can delve into.

2. Equivalent substitution method.

There are also some physical quantities that are not very good and do not perform in the test. They can be intuitive, but they are still a good measure of our effectiveness and the amount of this amount that simplifies the problem.

And if you use this standard diameter, you can use this multi-layered approach; When measuring the period of a single pendulum, you can see that these conditions can be expressed, and you can also see the paper tape, and you can find out the counting points at several points, and analyze them.

3. Accumulation method.

There are also reagents that can be changed to be accurate to some of your sight, and a small amount of physical quantity can be converted into a large amount of physical quantity. It is not only convenient to measure, but also can improve the measurement accuracy and reduce errors.

For example, when measuring uniform filament diameters, you can use the multi-circle method, but in the case of your measurements, you can measure the time of 30-50 full amplitudes; When analyzing tapes produced by point timing, the counting points can be found at several intervals.

4. Trace method.

Some physical processes are ephemeral, and we need to record and study them, photograph them, and analyze them like a camera.

For example, if you use this experimental method, you can see the trend of these fluctuations, record the position of an object with a point timer, use some species to toss the ball, and use an oscilloscope to observe the waveform of the AC signal.

5. Extrapolation.

But there are also some physics that can be changed and can be observed continuously. But in this situation, it is not easy to observe directly. If the local laws of observation are extrapolated to the extreme, the purpose can be achieved.

Chemistry Experimental Instruments.

There are 3 4 tests in Sudan fat with 50% alcohol to remove the floating color.