Gas exchange rates between natural waters and the atmosphere are an important component of our understanding of the dynamics of biologically active gases. For example, estimates of whole system metabolism must account for the transfer of gas (OJ between the atmosphere and water. Previous studies in estuaries have relied on dome measurements to estimate O2 exchange rates ( 1,2). In this study we...

Two-Way Fluid–Gas Exchange Syringe for Postvitrectomy Patients in Outpatient Setting Pars plana vitrectomy is a surgical procedure for the treatment of diseases such as rhegmatogenous retinal detachment, proliferative diabetic retinopathy, macular hole, and macular pucker (also called epiretinal membrane). In clinical medical practices, complications such as postvitrectomy vitreous hemorrhage, ...

Vocal signals play a very important role in the life of both birds and echolocating bats, but these two unrelated groups of flying vertebrates have very different vocal systems. They nevertheless must solve many of the same problems in producing sound. This brief review examines avian and microchiropteran motor mechanisms for: 1) coordinating the timing of phonation with the vocal motor pattern...

The intensity of exercise above which oxygen uptake (Vo2) does not account for all of the required energy to perform work has been associated with lactate accumulation in the blood (lactate threshold, LT) and elevated carbon dioxide output (gas exchange threshold). An increase in hydrogen ion concentration ([H+]) is approximately concurrent with elevation of blood lactate and CO2 output during ...

This study was undertaken to determine which of four commonly used ventilatory or gas exchange indices provides the most accurate and reliable detection of the anaerobic threshold (AT). Sixteen subjects performed two cycle ergometer tests to volitional fatigue. After 4 min of unloaded cycling, the work rate was increased 20 W/min. Ventilatory and gas exchange measurements were made every 30 s t...