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)
Just because you have a mold allergy, does not mean to say that you necessarily know it. If you can notice the smell of mold, you have the chance to notice that you have mold allergy symptoms some time after being exposed to mold. The smell of mold is not nice, but if you can smell it, you have a big advantage. You can protect your health and avoid triggering your mold allergy.