Female phallic urethra and persistent cloaca.

Accessory phallic urethra in the female newborn with a persistent cloaca is a rare entity. We present a variant with a cloaca that contained rectal, vaginal and bladder neck openings, as well as the proximal origin of the phallic urethra. The literature is reviewed.

Xenon Difluoride and the Nature of the Xenon-Fluorine Bond.

Xenon reacts with fluorine to form XeF(2) which can be isolated before it reacts with fluorine to form XeF(4). The linear configuration of XeF(2) with the 2.00-A bond length and the vibrational force constants support the assignment of 10 electrons to the valence shell of xenon.