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.
Tryptophan is also a precursor to the neurotransmitters serotonin and melatonin. Like other amino acids, tryptophan is a zwitterion at physiological pH where the amino group is protonated (âNH3+; pKa = 9.39) and the carboxylic acid is deprotonated ( âCOOâ; pKa = 2.38).