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** the ratio of the arterial partial-pressure of oxygen to the fraction of oxygen in the gases inspired ( PaO < sub > 2 </ sub >/ FiO < sub > 2 </ sub >) < 300 ( the definition of acute lung injury ), OR
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** and ratio
** Photolithography: the aspect ratio of an etched, or deposited structure is the ratio of the height of its vertical side wall to its width.
** In genomics, as a measure of evolution at the protein level ( also denoted as d < sub > N </ sub >/ d < sub > S </ sub > or K < sub > a </ sub >/ K < sub > s </ sub > ratio ).
** Compression change done in middle of model year once 10. 0: 1 compression ratio resulting piston stock were used up in production.
** Lowered 9. 3: 1 compression ratio four-valve engine optional for some international markets along with catalytic converter, standard in Australia.
** Nominal static compression ratio 10. 0: 1 ( True ratio between 9. 4: 1 and 10. 0: 1, depending on parts used ).
** North America manual tranmission model now uses same shorter final drive ratio as used elsewhere, to simplify production.
** Luca Pacioli's De divina proportione, concerning the golden ratio, is published in Venice, with illustrations by Leonardo da Vinci.
** The contention ratio, in computer networking, competition that applies specifically to the number of people connected to an ISP who share a set amount of bandwidth
** Return loss, the ratio of the amplitude of the reflected wave to the amplitude of the incident wave
** and arterial
** arterial partial-pressure of carbon dioxide ( PaCO < sub > 2 </ sub >) > 65 torr ( 20 mmHg ) over baseline PaCO < sub > 2 </ sub > ( evidence of hypercapnic respiratory failure ), OR
** A documented episode of arterial, venous, or small vessel thrombosis — other than superficial venous thrombosis — in any tissue or organ by objective validated criteria with no significant evidence of inflammation in the vessel wall, and / or
** Arterial baroreceptors sense a decreased arterial pressure, and signals to the central nervous system in the area postrema and nucleus tractus solitarius.
** and oxygen
** Carbon monoxide poisoning which inhibits the ability of hemoglobin to release the oxygen bound to it.
** Swede Göran Kropp reaches the Mount Everest summit alone without oxygen, after having bicycled there from Sweden.
** Reinhold Messner ( Italy ) and Peter Habeler ( Austria ) made the first ascent of Mount Everest without supplemental oxygen.
** Sport spearfishing became common in the Mediterranean, and spearfishers gradually developed the common sport diving mask and fins and snorkel, with Georges Beuchat in Marseille, France, which created the speargun and Italian sport spearfishers started using oxygen rebreathers.
** acrylic polyesters, pure polyester PAN fibers are used to make carbon fiber by roasting them in a low oxygen environment.
** supplemental oxygen requirement of greater than FiO < sub > 2 </ sub > 0. 5 to maintain oxygen saturation ≥ 92 %
** Energy is transferred from triplet protoporphyrin IX to triplet oxygen, resulting in singlet ( ground state ) protoporphyrin IX and excited singlet oxygen ;
** Nasal oxygen with oxygen saturation monitoring ( e. g., for infants with chronic lung disease needing long-term oxygen and monitoring ).
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