What safety precautions must be observed when using pyridinium tribromide?

In handling a pyridinium tribromide it should be avoid formation of dust and aerosols, then the handler should provide correct exhaust ventilation at the places or areas where dust is formed and it is a normal measures for preventive fire protection. And in storage it must be keep in a tightly closed container in a dry area.

Answer and Explanation:

Pyridinium tribromide is corrosive and a lachrymator in nature so a person who uses the chemical must needs to use the fume hood at all times when using this substance. He must avoid all contact with skin and fumes with eyes and mouth by wearing goggles and gloves.

enzyme active site and substrate specificity

enzymes bind with chemical reactants called substrates. there may be one or more substrates for each type of enzyme, depending on the particular chemical reaction. in some reactions, a single-reactant substrate is broken down into multiple products