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)
A number of factors can make you more likely to develop a mold allergy or worsen your existing mold allergy symptoms, including: 1  Having a family history of allergies. If allergies and asthma run in your family, you're more likely to develop a mold allergy.  Working in an occupation that exposes you to mold.