Respiratory gas exchange on exercise was evaluated as a non-invasive method of assessing patients with heart failure. Twenty four men (age 28-72) with symptomatic chronic stable heart failure (New York Heart Association class II-III) and ten controls aged 36-70 were studied. During treadmill exercise oxygen consumption and carbon dioxide production were measured continuously by analysis of mixe...

Honeybee defensive behavior is a useful selection criterion, especially in areas with Africanized honeybees (Apis mellifera L). In all genetic improvement programs the selected characters must be measured with precision, and because of this we evaluated a metabolic method for testing honeybee defensive behavior in the laboratory for its usefulness in distinguishing between honeybee ecotypes and...

We measured oxygen consumption in 426 infants and children during cardiac catheterization using an open circuit, flow-through technique. Since this method does not require the cooperation of the patient, determinations were readily made in 170 infants. The purpose of this study was to determine those factors which significantly influence oxygen consumption and to determine the potential errors ...

In 1953, Bülbring noted that the smooth muscle of teania coli from guinea pig showed an increase in oxygen consumption associated with tension development when stimulated by a drug such as acetylcholine, histamine or eserine (1). Recently Urakawa and his co workers found that high concentration of potassium in Tyrode solution induced an in crease in oxygen consumption accompanied by a rise...

Measuring or predicting the distribution of oxygen concentration in waste rock underneath a soil cover is an important aspect of cover performance evaluation. The oxygen decay coefficient is a key parameter in the prediction. In the present study, a method calculating oxygen decay coefficient from oxygen consumption rate is developed. The decrease in oxygen concentration over time measured abov...

1. The rate of oxygen consumption by E. coli has been observed both in the presence and absence of ammonia which substance is used by this organism in these experiments as the sole source of nitrogen for growth. 2. After the ammonia has been completely taken up in a culture of E. coli, the rate of oxygen consumption by the culture is observed to fall rapidly. It becomes relatively constant agai...

1. Swimming performance and oxygen consumption of normoxic (control) and hypoxia-acclimated (P02 — 40mmHg) rainbow trout, Salmo gairdneri Richardson, were monitored at >145, 60 and 40mmHg. 2. Maximum swimming velocity at 40mmHg was reduced from >54-8cms"' to 41-4cms" in controls and to 40-6cms" in hypoxiaacclimated fish. 3. Normoxic oxygen consumption of control fish ranged from Q-T-SmgOzkg-'h(...

The influence of ConA on the energy metabolism of quiescent rat thymocytes was investigated by measuring the effects of inhibitors of protein synthesis, proteolysis, RNA/DNA synthesis, Na+K(+)-ATPase, Ca(2+)-ATPase and mitochondrial ATP synthesis on respiration. Only about 50% of the coupled oxygen consumption of quiescent thymocytes could be assigned to specific processes using two different m...

In this study, the effect of zinc and nickel on oxygen consumption in sediments was determined using oxygen microsensors. Sediments from the southwest lagoon of New Caledonia, in the vicinity of the city of Nouméa, were incubated nearby in situ conditions and exposed to Zn and Ni concentrations of 20 and 60 mg l(-1). The depth distribution of oxygen consumption was estimated from the steady-sta...

This investigation evaluated regional differences in blood flow and oxygen consumption and their relationship in exercised muscle during recovery from exhaustive exercise. Five healthy men performed exhaustive one-legged cycling exercise. Positron emission tomography was used to measure blood flow, oxygen uptake, and oxygen extraction in the quadriceps femoris muscle before and after exercise. ...