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In this essay, we question the sole use of mg/L (ppm) and the term DO (dissolved oxygen) when referring to oxygen supply in water, and discuss reasons for also reporting the partial pressure of oxygen (PO). Oxygen moves from water into organisms by diffusion only, and the rate and direction of diffusion is solely dependent upon partial pressure gradients, not concentration gradients. However, the amount of oxygen moved into an organism is both a function of DO and PO. Therefore, to have physiological and ecological relevance, the presence of oxygen in water, when reported as DO, should also include PO.
This article was published in the following journal.
Name: Comparative biochemistry and physiology. Part A, Molecular & integrative physiology
Arterial oxygen tension and oxyhemoglobin saturation (SaO) decrease in parallel during hypoxia. Distinguishing between changes in oxygen tension and oxygen content as the relevant physiological stimul...
To investigate the sensitivity of modified Look-Locker inversion recovery (MOLLI) to measure changes in dissolved oxygen (DO) concentrations in water samples and to calculate sequence-specific relaxiv...
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The rate at which oxygen is used by a tissue; microliters of oxygen STPD used per milligram of tissue per hour; the rate at which oxygen enters the blood from alveolar gas, equal in the steady state to the consumption of oxygen by tissue metabolism throughout the body. (Stedman, 25th ed, p346)
Stable oxygen atoms that have the same atomic number as the element oxygen, but differ in atomic weight. O-17 and 18 are stable oxygen isotopes.
Molecules or ions formed by the incomplete one-electron reduction of oxygen. These reactive oxygen intermediates include SINGLET OXYGEN; SUPEROXIDES; PEROXIDES; HYDROXYL RADICAL; and HYPOCHLOROUS ACID. They contribute to the microbicidal activity of PHAGOCYTES, regulation of signal transduction and gene expression, and the oxidative damage to NUCLEIC ACIDS; PROTEINS; and LIPIDS.
Unstable isotopes of oxygen that decay or disintegrate emitting radiation. O atoms with atomic weights 13, 14, 15, 19, and 20 are radioactive oxygen isotopes.
An excited state of molecular oxygen generated photochemically or chemically. Singlet oxygen reacts with a variety of biological molecules such as NUCLEIC ACIDS; PROTEINS; and LIPIDS; causing oxidative damages.