Said of a semiconductor diode, p-n junction, or the emitter-base junction of a transistor, when the polarity of the applied emf is such as to allow substantial conduction to take place, 1  TRANSISTOR.  PNP TRANSISTOR, P-N-P TRANSISTOR.
The symptoms of mold allergy are very similar to the symptoms of other allergies, such as sneezing, itching, runny nose, congestion and dry, scaling skin. Outdoor molds may cause allergy symptoms in summer and fall (or year-round in some climates)
Although shower stalls and basements are typical moist areas prone to the growth of molds, any moist area in the household may harbor mold. Allergic reactions to mold are the most common health effects and risks of mold. Mold allergy symptoms and signs include.