• reactive
  • Late Pregnancy Antioxidants such as carotenoids, vitamin C, Vitamin E, and enzymes such as superoxide dismutase (SOD) and glutathione peroxidase (GPx) can protect against reactive oxygen species that damage DNA, proteins and lipids, and result in cell senescence and death. (wikipedia.org)
  • partial pressure
  • Because oxygen partial pressure (PO 2 ) in the coronary arterioles is identical in specimens from both ventricles, whereas that of ventricular blood is 2.5-fold higher in the left ventricle than in the right ventricle, trabeculae represent a "natural laboratory" in which to examine the influence of "extravascular" PO 2 on the extent of capillarization of myocardial tissue. (rupress.org)
  • Because all specimens are supplied by coronary blood at the same oxygen partial pressure (PO 2 ), but they are situated in chambers whose ambient PO 2 differs by some 2.5-fold, trabeculae represent a naturally occurring "laboratory" in which to examine the extent to which capillarization is responsive to the PO 2 of extravascular blood. (rupress.org)
  • physiological effect of oxygen metabolisn on the total gas concentration in venous blood In diving, the oxygen window is the difference between the partial pressure of oxygen (ppO2) in arterial blood and the ppO2 in body tissues. (wikipedia.org)
  • Behnke refers to early work by Momsen on "partial pressure vacancy" (PPV) where he used partial pressures of oxygen and helium as high as 2-3 ATA to create a maximal PPV. (wikipedia.org)
  • diver
  • At shallow depths, a diver using open-circuit breathing apparatus typically only uses about a quarter of the oxygen in the air that is breathed in, which is about 4 to 5% of the inspired volume. (wikipedia.org)
  • As the diver goes deeper, much the same mass of oxygen is used, which represents an increasingly smaller fraction of the inhaled gas. (wikipedia.org)
  • When that breath is exhaled back into the surrounding environment, it has an oxygen level in the range of 15 to 16% when the diver is at atmospheric pressure. (wikipedia.org)
  • demands
  • Interval training in severely disabled COPD patients is associated with stable metabolic demands, (23) low minute ventilation and rates of dynamic hyperinflation, and increased total exercise duration than that of constant-load exercise. (thefreedictionary.com)
  • Nitrogen
  • The International Space Station (ISS) requires stores of Oxygen (O2) and Nitrogen (N2) to provide for atmosphere replenishment, direct crew member usage, and payload operations. (sae.org)
  • coronary
  • In vivo, trabeculae are unique in receiving oxygen from two independent sources: the coronary circulation and the surrounding ventricular blood. (rupress.org)
  • However, in an extensive series of investigations over the past two decades, H.F. Downey and co-workers have quantified striking differences in coronary blood flow and oxygen supply between the right ventricle (RV) and left ventricle (LV). (rupress.org)
  • response
  • The goal of this study was to investigate the effect of metabolic-targeting through HIF-1α inhibition and the associated changes in glycolysis, oxygen consumption and response on the efficacy of high-dose single-fraction radiotherapy (HD-SFRT). (biomedcentral.com)
  • Replicative aging has been linked to the retrograde response, which is activated by an intracellular signalling pathway from the mitochondrion to the nucleus and leads to the transcription of several genes encoding for metabolic enzymes. (wiley.com)
  • Neonates have a metabolic response to cooling that involves chemical (nonshivering) thermogenesis by sympathetic nerve discharge of norepinephrine in the brown fat. (merckmanuals.com)
  • rates
  • Uroderma bilobatum support flight with some of the fastest metabolic incorporation rates and dynamic circulating cortisol in vertebrates. (elifesciences.org)
  • chamber
  • HIF-1α wild-type and HIF-1α knockdown FaDu and ME180 xenograft tumors were grown in the hind leg of mice that were placed in an environmental chamber and exposed to different oxygen conditions (air-breathing and hypoxia). (biomedcentral.com)
  • respiration
  • The measured effects were that muscles of respiration were strengthened, the heart was strengthened, blood pressure was sometimes lowered and the total amount of blood and number of red blood cells increased, making the blood a more efficient carrier of oxygen. (wikipedia.org)
  • breath
  • Since only a small part of the oxygen, and virtually none of the inert gas is consumed, every exhaled breath from an open-circuit scuba set represents at least 95% wasted potentially useful gas volume, which has to be replaced from the breathing gas supply. (wikipedia.org)
  • A breath inhaled from an open circuit scuba system whose cylinders are filled with ordinary air is about 21% oxygen. (wikipedia.org)
  • energy
  • Activating the immune system has the present and future benefit of clearing infections, but it is also both expensive in regard to present high metabolic energy consumption, and in the risk of resulting in a future immune related disorder. (wikipedia.org)
  • widely
  • Singlet oxygen ( 1 O 2 ) is widely believed to be the major cytotoxic agent involved in photodynamic therapy (PDT). (aacrjournals.org)
  • result
  • The brain is relatively poorly supplied by oxygen as a result of mild hypoventilation during the sleeping hours, and also cerebral edema may worsen during the night due to the lying position. (wikipedia.org)
  • enough
  • Animals must balance between generating enough metabolic power to find and acquire food and maintaining sufficient reserves to sustain daily maintenance, and repair and reproduce. (elifesciences.org)
  • normal
  • In normal use at constant depth, only oxygen is consumed: small volumes of inert gases are lost during any one dive, due mainly to venting of the gas on ascent. (wikipedia.org)