The growth of many fungi, yeasts, bacteria, and viruses was inhibited by tannins. Tannins are found in many of the foods you eat, including fruits, teas, wine and edible grasses -- like corn. Tannin blocks the orifices of tiny cells in the body, which absorbs nutrient from eaten food.
The JFET is a Voltage Operated Transistor. In the N channel device, the N channel is sandwiched between two P type regions (the gate and the substrate) that are connected together electrically to form the gate. The N type channel is connected to the source and drain terminals via more heavily doped N+ type regions.
Unlike phantom power, bias does not require a balanced circuit. Bias supplies power to a Junction Field Effect Transistor (JFET) connected to the output of an electret condenser mic element. The JFET acts as an impedance converter that is a necessity in any microphone design that uses a condenser element.