We compared the acute effects of dobutamine and isoproterenol on cardiac O, balance and regional blood flow (studied with microspheres) in eight male beagles with a narrowed left anterior descending coronary artery (LAD). The two drugs similarly increased cardiac contractility, output, and oxygen consumption. However, unlike isoproterenol, dobutamine did not accelerate heart rate or markedly lo...

[1] Stable oxygen isotope fractionation factors (a’s) between individual dissolved carbonate species (CO2(aq.), H2CO3, HCO3 , CO3 2 ) and water, and their sum (S = [CO2(aq.)] + [H2CO3] + [HCO3 ] + [CO3 2 ]) and water are fundamental geochemical parameters. While values of a(CO2(aq.) H2O), a(HCO3 H2O), and a(CO32 H2O) have recently been examined, an overall mass balance for stable oxygen isotope...

s of the 17th Annual Meeting of ESMAC, Oral Presentations / Gait & Posture 28S (2008) S1–S48 S43 Discussion: It is shown that the energy requirement for balance control can be substantial. The average increase of 0.86W/kg in tandem stance with eyes closed, is equivalent to a 17% increase in oxygen consumption during walking, which is a common increase for pathological gait [1] The relation betw...

Purpose: The aim of this study was to evaluate the effect of epinephrine (Epi) or felypressin (Fely) contained in dental local anesthetics on myocardial oxygen balance. Methods: Male Japan White tracheotomized rabbits were anesthetized with isoflurane. Three doses of 0.18, 0.36, and 0.72 ml of 2% lidocaine hydrochloride containing 1: 80,000 Epi or 3% prilocaine hydrochloride containing 0.03 IU/...

The influence of power consumption on the volumetric mass transfer coefficient was studied in a 5 liter stirred tank bioreactor during cultivation of a recombinant Chinese Hamster Ovary (CHO) cell line, which requires low aeration and mixing intensity. Under these conditions and at high cell concentrations, oxygen mass transfer coefficient and consequently volumetric oxygen mass transfer rate w...

Oxygen concentration and separation is an essential factor for air recycling in a CELSS. Furthermore, if the value of the plant assimilatory quotient is not coincident with that of the animal respiratory quotient, the recovery of O2 from the concentrated CO2 through chemical methods will become necessary to balance the gas contents in a CELSS. Therefore, oxygen concentration and separation equi...

At a resting pulse rate the heart consumes almost twice-as much oxygen per gram tissue as the brain and more than 43 times more than resting skeletal muscle (1). Unlike skeletal muscle, cardiac muscle cannot sustain anaerobic metabolism. Balancing oxygen demand with availability is crucial to cardiac function and survival, and regulated gene expression is a critical element of maintaining this ...