Necrotizing sialometaplasia: review of the literature and report of nonulcerative case.

A review of the literature and a report of a case of necrotizing sialometaplasia of the hard palate is presented. Because necrotizing sialometaplasia may be misdiagnosed as squamous cell carcinoma or mucoepidermoid carcinoma, it is important that the clinician and pathologist take the necessary precautions to prevent any further mutilative surgery for this benign disease entity.

The comparative uptake of Ba2+ and other alkaline earth metals by plant mitochondria.

(1) The transport of Ba2+ by mung bean (Phaseolus aureus L) mitochondria is examined and its uptake properties compared with the accumulation of other alkaline earth metals by plant mitochondria. Uptake is supported by oxidizable substrates but not by ATP under the conditions examined. Ba2+ uptake shows an absolute requirement for Pi, whereas AsO4, acetate and oxalate do not replace Pi. ATP synthesis inhibits Ba2+ uptake 50% and both 2,4-dinitrophenol and valinomycin plus K+ inhibit uptake over 80%. (2) The relative capacity to transport a series of alkaline earth metals showed a preferred order of: Sr2+ > Ca2+ > Ba2+ >> Mg2+. Mitochondria isolated from three plant sources showed net levels of Mg2+ uptake 7% or less than the observed Sr2+ uptake values. The same relative order of alkaline earth metal supported uptake of Pi was observed with bean (Phaseolus vulgaris L) mitochondria. It is suggested that salt transport in plant mitochondria involves a carrier complex which binds both divalent cations and Pi.