PubMed Health⌕ Search

Biomedical subjects

S I Singh

Publications and source records attributed to S I Singh.

15 recordsLinked to original sources
PubMed1990

A study on large radial motion of arteries in vivo.

This study analyses the radial periodic motion of an artery which is modelled as a thin cylinder of uniform cross-section subjected to dynamic inner pressure using the theory of finite deformation of elastic materials. The arterial tissue properties (anisotropy, homogeneity and incompressibility) are taken into account in an analysis based on the use of the strain energy function. The validity of the mathematical analysis is illustrated through numerical computation applying the available in vivo data for elastic constants of the canine middle descending thoracic aorta to the expressions for the intramural pressure and circumferential stresses obtained by solving the necessary equation of motion together with the boundary conditions. Results obtained in this study indicate very low stresses which suggest that the arteriosclerosis resulting from high stress gradients is effectively ruled out in this model.

Animals↗
PubMedDate not supplied

Effect of tonicity on glucose absorption and histomorphology of rat intestinal mucosa.

Perfusion of the gut lumen with 2 ml of isotonic solutions showed uniform absorption of glucose and water over the four 15-minutes study periods, the absorption being maximum in jejunum and least in colon. With hypertonic solutions the glucose absorption decrease was related to the increasing osmolarity and duration of exposure to the solution as well as the nature of the substance used. Histological changes reflecting impaired functions were localised to the tips of the villi and were observed on exposure to hypertonic solution for 45 minutes or more.

Animals↗