Next time when you call a service provider whom you have chosen from JUST DIAL check your balance in your phone.The phone will be ringing & no one answers but when you disconnect the call your balance will be deducted without speaking.
L-TRYPTOPHAN Overview Information. L-tryptophan is an amino acid, a protein building block that can be found in many plant and animal proteins. L-tryptophan is called an âessentialâ amino acid because the body canât make it. It must be acquired from food.
To a solution of L-tryptophan (50 g) in water was added a solution of an excess of copper(II)acetate in water. The resultant precipitate was filtered. The extract was then washed several times with hot water to give the copper chelate compound. Yield: 52 g, mp >280C.