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.
With the JFET biased in this way, a small change in VGS can be used to control the current through the sourceâdrain channel from its maximum(saturated) value to zero current. This type of operation is shown in the fairly flat top to the output characteristics shown in fig 2.3.