hepatoprotective efficacy of propolis extract (honeybee hive product, 200 mg/kg, p.o.) was studied against carbon-tetrachloride-(ccl 4, 0.15 ml/kg, i.p.) induced biochemical and histopathological changes. silymarin, a known hepatoprotective drug was used as a positive control. subchronic exposure to ccl 4 for 3 weeks (5 days a week) caused sharp elevation in the activity of liver enzymes i.e. ,...

p53 is a frequent target for mutation in human tumors, and mutant p53 proteins can actively contribute to tumorigenesis. We employed a three-dimensional culture model in which nonmalignant breast epithelial cells form spheroids reminiscent of acinar structures found in vivo, whereas breast cancer cells display highly disorganized morphology. We found that mutant p53 depletion is sufficient to p...

Methods are presented to map complex fiber architectures in tissues by imaging the 3D spectra of tissue water diffusion with MR. First, theoretical considerations show why and under what conditions diffusion contrast is positive. Using this result, spin displacement spectra that are conventionally phase-encoded can be accurately reconstructed by a Fourier transform of the measured signal's modu...

We have studied a transplantable carcinoma of the rat pancreas [Reddy, J. K. & Rao, M. S. (1977( Science 198, 78-80] that is composed of cytologically differentiated acinar cells that have lost their epithelial orientation and do not form acini. Light microscopy shows, however, consistent palisading, reorientation, and polarization of these cells in areas of contact with the vasculature. Electr...