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Vaginal infections are a very common cause for the pH of the vagina to rise. The most common vaginal infection in my practice (and in all doctor's offices) is Bacterial Vaginosis which causes the normal vaginal pH to rise to above 4.5. Odor usually occurs with Bacterial Vaginosis.
Yes, BJTs have the same voltage drop across their junctions as common diodes, that's 0.6V Ã  0.7V between base and emitter, and the same between base and collector. Since they act like diodes they don't conduct in both directions if you apply a voltage across the two pins.