Rebecca M Smith

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The localization was determined of the triterpenoids, asiaticoside and madecassoside, in different organs of glasshouse-grown plants and cultured material, including transformed roots, of two phenotypes of Centella asiatica (L.) Urban of Malaysian origin. Methanolic extracts of asiaticoside and madecassoside were prepared for gradient HPLC analysis. The two(More)
247-250. (44) Davis, E. M.; Bishop, J. R.; Guthrie, R. K.; Forthofer, R. Water Res. 1978, 12, 917-923. (45) Petrasek, A. C.; Wolf, H. W.; Esmond, S. E.; Andrews, D. C. “Ultraviolet Disinfection of Municipal Wastewater Effluents”; U S . Environmental Protection Agency: Cincinnati, OH, 1980; p 228 (EPA-600/2-80-102). (46) Portnoy, B. L.; Mackowiak, P. A.;(More)
Mapping the myocardial fiber organization is important for assessing the electrical and mechanical properties of normal and diseased hearts. Current methods to determine the fiber organization have several limitations: histological sectioning mechanically distorts the tissue and is labor-intensive, while diffusion tensor imaging has low spatial resolution(More)
Optical mapping has become an indispensible tool for studying cardiac electrical activity. However, due to the three-dimensional nature of the optical signal, the optical upstroke is significantly longer than the electrical upstroke. This raises the issue of how to accurately determine the activation time on the epicardial surface. The purpose of this study(More)
The development of voltage-sensitive dyes has revolutionized cardiac electrophysiology and made optical imaging of cardiac electrical activity possible. Photon diffusion models coupled to electrical excitation models have been successful in qualitatively predicting the shape of the optical action potential and its dependence on subsurface electrical wave(More)
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