what is reverse biasing of a pn junction
p–n junction Connecting the p-type region to the negative terminal of the battery and the n-type region to the positive terminal corresponds to reverse bias. If a diode is reverse-biased, the voltage at the cathode is comparatively higher than at the anode. Therefore, very little current will flow until the diode breaks down. The connections are illustrated in the adjacent diagram.
Junctional epithelium The junctional epithelium, a nonkeratinized stratified squamous epithelium,[1] lies immediately apical to the sulcular epithelium, which lines the gingival sulcus from the base to the free gingival margin, where it interfaces with the epithelium of the oral cavity.The gingival sulcus is bounded by the enamel of the crown of the tooth and the sulcular epithelium. Immediately apical to the base of the pocket, and coronal to the most coronal of the gingival fibers is the junctional epithelium. The JE attaches to the surface of the tooth by way of the EA with hemidesmosomes and is, on average, roughly 1Â mm in width in the apico-coronal dimension, constituting about one half of the biologic width.[2] The attachment of the JE to the tooth surface can occur on enamel, cementum, or dentin. The position of the EA on the tooth surface is initially on the cervical half of the anatomical crown when the tooth first becomes functional after tooth eruption.[3][4]