The site and character of precious and basemetal epithermal deposits is determined by several principal factors which include: structure, stratigraphy, lithology, pressure and temperature. hydrology, chemistry of the mineralizing fluid, and syn-hydrothermal development of permeability or changes in hydraulic gradient (White and Hedenquist, 1990). This study investigates the syn-hydrothermal dev...

Down-regulation of aquaporin genes in plant roots in response to water-deficit and salt stress has been reported in many systems including corn, rice, and cotton. Since aquaporins passively aid water movement, we speculate the down-regulation of aquaporin transcripts is a means to reduce the hydraulic conductivity of roots in situations when the osmotic gradient favors water efflux. However, po...

INTRODUCTION Mechanotransductive signals through fluid flow stimulation, e.g., intramedullary pressure (ImP), have been shown effective in bone adaptation. ImP distribution is suggested to influence the mechanotransductory signals within bones. Suggested by the muscle pump theory, muscle compressions may increase vessel pressure gradient that can directly increase ImP. To further elucidate the ...

We and others have shown that the loss of fluid and macromolecules from the peritoneal cavity is directly dependent on intraperitoneal hydrostatic pressure (Pip). Measurements of the interstitial pressure gradient in the abdominal wall demonstrated minimal change when Pip was increased from 0 to 8 mmHg. Because flow through tissue is governed by both interstitial pressure gradient and hydraulic...

SUMMARY The instantaneous response of the left ventricle to loss or recoverv of effective atrial contraction was studied in 12 patients with valvular aortic stenosis by producing A-V dissociation by electrical pacing of the ventricles so that some ventricular contractions were preceded by an effective atrial contraction while others were not. A conventional hydraulic formula relatinig size of t...