Working principle of centrifugeWhen the suspension containing fine particles stands still, the suspended particles gradually sink due to the action of the gravity field. The heavier the particle, the faster it sinks, otherwise the particle with a density lower than that of the liquid will float up.T Read More

Precautions for the use of centrifuge1. In order to ensure safety and centrifugal effect, the instrument must be placed on a sturdy and level table, and no objects should be placed on the engineering plastic door; the samples must be placed symmetrically, and the nuts must be tightened before starti Read More

Precautions for the use of heating chemical instruments(1) Test tubeA container used to hold a small amount of medicine, a small amount of reagent reaction under normal temperature or heating, can be used to prepare or collect a small amount of gas.Precautions for use:①It can be heated directly and Read More

How to use microscope slides1. The smear method is a method for making the material evenly on the glass slide.Smear materials include single-celled organisms, small algae, blood, bacterial culture, loose tissues of animals and plants, testis, anthers, etc.Attention should be paid when smearing:(1) T Read More

Precautions for the use of vortex mixer1. Requirements for the use of vortex mixer(1) Use environment requirements:① The work surface should be firm, flat and clean;②There is no corrosive gas in the environment;③Keep a good ventilation environment.(2) Please do the inspection work before using the e Read More

Common pipettes1. MicropipetteThe micropipette is a single-channel micropipette commonly used in biological (chemical) laboratories to pipette liquid with a small volume.2. External piston pipetteDue to the difference in vapor pressure, density and viscosity, some high-viscosity substances, such as Read More

Matters needing attention in pipette maintenance1. If it is not used for a long time, adjust the range of the pipette gun to the maximum scale to make the spring in a relaxed state to protect the spring. Not paying attention to this point will easily cause the piston to fail to rebound.2. If the pip Read More

The use of pipettes1. Choose the right pipetteWhen pipetting standard solutions (such as water, buffer, diluted salt solution and acid-base solution), use an air displacement pipette to pipette liquids with high volatility, high viscosity, and density greater than 2.0g/cm or in clinical practice. Us Read More

Four requirements for laboratory instrument managementEveryone knows that there are more equipment in the laboratory, so the display and storage of equipment is a technical problem. The display and storage of equipment not only affects the appearance, but also directly affects the performance and se Read More