In vitro organogenesis of citrus was studied for the genotypes Citrus sinensis cv. ‘Natal’, C. limonia, C. volkameriana, and C. aurantium, with the use of epicotyl segments-derived explants, cultured in MT salts and vitamins medium supplemented with different concentrations of 6-benzylaminopurine (BAP – 0.0; 0.5; 1.0; 1.5, or 2.0 mg L-1). For the recalcitrant genotypes C. limonia and C. auranti...

The effect of aging on myelin sheaths in the rhesus monkey was studied in the vertical bundles of nerve fibers that traverse monkey cerebral cortex in primary visual area 17 and prefrontal area 46. As shown previously, with age the internodes of many of these myelin sheaths show structural changes, the most common of which is an accumulation of electron-dense cytoplasm within some sheaths, a ch...

Endocardial and epicardial activation pathways of the canine right atrium. Am. JS Physiol. 220(l) : l-l 1. 197 1 .-Right atria1 epicardial and endocardial activation was explored in Langendorff-perfused canine hearts during sinus rhythm and during stimulation near the coronary sinus and elsewhere in the right atrium. Control experiments demonstrate close correlation to epicardial activation in ...