A miniature scintillation detector recently designed and constructed in this laboratory can be inserted into the esophagus and under fluoroscopic vision positioned so that radioactivity emitted from the blood in the descending aorta can be detected and a time-concentration curve recorded from which cardiac output can be determined. Twenty simultaneous determinations of cardiac output by the iso...

There is a misconception among plant scientists that osmosis is driven by the tendency of solutes to dilute water. In this opinion article, we discuss the quantitative and qualitative failures of this view, and go on to review the correct kinetic picture of osmosis as it appears in physics textbooks.

Equations are developed for the estimation of cardiac output from hematocrit dilution, using the continuously recorded conductivity of whole blood drawn from an artery through a conductivity cell, after a single intravenous injection of autogenous plasma. The equipment used is described, the results are compared with those of simultaneously performed measurements of dye dilution and the advanta...

The term “Natural Attenuation” (NA) has been defined as “naturally occurring processes in soil and groundwater environments that act without human intervention to reduce the mass, toxicity, mobility, volume, or concentration of contaminants in those media” (Wiedemeier et al., 1999). This popular definition goes on to mention that the “in-situ” processes of NA include biodegradation, dispersion,...

The possibility of measuring pulmonary blood flow in patients with central arteriovenous shunts utilizing the initial portion of indicator-dilution curves was explored in 16 patients by comparing these values for pulmonary blood flow with determinations by the direct Fick method. A good correlation between Fick and indicator-dilution values was obtained, and no systematic differences were demon...

money laundering is a silent crime which crosses international boundaries. modern technology has led to new avenues to disguise the proceeds of crime. the advent of electronic money has meant that tracing the transfer of possibly illicit funds is an extremely difficult if not impossible task. therefore there is a need to take consistent measures against money laundering throughout the world esp...

ONE of the main problems in the use of continuously recorded dye dilution curves has been the calibration of the obtained curves. Methods involving measurements from the "tail" of the dilution curve are often inaccurate because in this portion of the curve the concentration of dye is low. Other methods of calibration involve determinations from a sample of blood withdrawn before or after the di...