Do you know how to operate a micropipette correctly
Time of Update: 2022-09-21
5. Pipetting: empty the tip before washing, press the micropipette to a stop point, slowly release when sucking, do not use too much force, stay against the wall for 1 to 2 seconds.
Diagnosis and Solution of Common Faults of Liquid Filling Machine
Time of Update: 2022-06-04
Solution: It may be that the fuel injection switch is damaged or the base of the time relay is loose .
Failure problem: If the material is not filled after touching the material filling switch, but the digital LED indicator of the time relay flashes Solutions: 1.
Determination of 9 Nitroimidazole Residues in Royal Jelly and Lyophilized Powder
Time of Update: 2021-09-30
Table 16-17 Liquid Chromatography Mobile Phase Gradient Table(2) Mass spectrometry conditionsIon source: atmospheric pressure chemical ionization source (or equivalent ionization source); scanning method: positive ion scanning (+); detection method: multiple reactive ion monitoring (MRM); electrospray voltage (IS): 5250V; atomizing gas (NEB) Relative open flow rate: 14.
Conventional method for determination of residual β-agonist drugs (1
Time of Update: 2021-09-05
1. 2 Principle of the methodAfter the sample is hydrolyzed with dilute acid and the protein is precipitated by perchloric acid, the residual β-agonist is extracted with a mixed solvent of ethyl acetate and isopropanol, purified by a mixed cation exchange reversed-phase adsorption solid phase extraction column, liquid chromatography-tandem mass spectrometry Measure and quantify by internal standard method .
A article to understand the key points of epoxy glue coating
Time of Update: 2020-12-31
Like solvent-free epoxy glue and dense adhesive, generally coated once the glue can be, and most solvent-based epoxy resin glue and porous adhesive or require a certain thickness of the glue layer construction, need to apply glue 2 to 3 times.