It can cause nausea and diarrhea, especially in high doses or after long-term use. It might also pose a risk of ulcers in high doses. As a topical treatment, it can cause skin irritation. Caution is advised when turmeric is taken by people known to have gallstones; consult your health care provider first.
Gain is the ratio between the magnitude of output and input signals. Gain controls on an amplifier are basically just small potentiometers (variable resistors) or volume controls, that allow you to adjust the incoming signal to the amplifier.
First, although they look similar with each other, dB dBm and dBi actually means very different things, so they are not interchangeable, dB is a relative term measuring two different power or voltage levels, and dB usually measures relative power when used in RF remote control transmitters, dB value can be calculated by 10 log P1/P2, where P1 and P2 ...