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Topics referred to by the same term
Oxygen concentration may refer to: What oxygen concentrators do - increase the fraction of oxygen in a gas mixture Oxygen saturation, the fraction of
Oxygen_concentration
Concentration of oxygen below which combustion is not possible
limiting oxygen concentration (LOC), also known as the minimum oxygen concentration (MOC), is defined as the limiting concentration of oxygen below which
Limiting_oxygen_concentration
Device for measuring oxygen concentration
An oxygen sensor is an electronic component that detects the concentration of oxygen molecules in the air or a gas matrix such as in a combustion engine
Oxygen_sensor
Chemical element with atomic number 8 (O)
oxygen Limiting oxygen concentration Oxygen compounds Oxygen plant Oxygen sensor Dark oxygen Portals: Chemistry Medicine Oxygen at Wikipedia's sister projects:
Oxygen
Insufficient oxygen in breathed air
reduce the oxygen concentration in inspired gas and blood to dangerously low levels, thereby eventually depriving cells in the body of oxygen. According
Inert_gas_asphyxiation
Measure of dissolved or carried oxygen
Oxygen saturation (symbol SO2) is a relative measure of the concentration of oxygen that is dissolved or carried in a given medium as a proportion of
Oxygen_saturation
sedimentary rocks, making oxygen concentration important for geology and sedimentary rocks important for understanding oxygen concentration over geologic time
Geological_history_of_oxygen
Galvanic cell
creating a difference in oxygen concentration between two points. Corrosion will occur at the area of low-oxygen concentration, which are anodic. If a
Concentration_cell
Zone in which oxygen saturation in seawater in the ocean is at its lowest
matter; oxygen is used as part of the bacterial metabolic process, lowering its concentration within the water. Therefore, the concentration of oxygen in deep
Oxygen_minimum_zone
also known as oxygen reduction system (ORS), is an active fire protection technique based on a permanent reduction of the oxygen concentration in the protected
Hypoxic air technology for fire prevention
Hypoxic_air_technology_for_fire_prevention
Minimum concentration of oxygen supporting combustion
The limiting oxygen index (LOI) is the minimum concentration of oxygen, expressed as a percentage, that will support combustion of a polymer. It is measured
Limiting_oxygen_index
Biogeochemical cycle
approximation, the concentration of ozone in the stratosphere. It includes four processes - and a fifth, less important one - all involving oxygen atoms and molecules
Ozone–oxygen_cycle
Use of oxygen as a medical treatment
as in ECMO therapy. Oxygen is required for normal cellular metabolism. However, excessively high concentrations can result in oxygen toxicity, leading to
Oxygen_therapy
Medical condition of lack of oxygen in the tissues
hypoxia is often a pathological condition, variations in arterial oxygen concentrations can be part of the normal physiology, for example, during strenuous
Hypoxia_(medicine)
Oxygen needed to remove organics from water
Biochemical oxygen demand (also known as BOD or biological oxygen demand) is an analytical parameter representing the amount of dissolved oxygen (DO) consumed
Biochemical_oxygen_demand
Plastic mask for oxygen therapy
breathe on their own, but who may require a higher oxygen concentration than the 21% concentration found in ambient air. Patients who are unable to breathe
Simple_face_mask
Visual tool used to understand how human blood carries and releases oxygen
The oxygen–hemoglobin dissociation curve, also called the oxyhemoglobin dissociation curve or oxygen dissociation curve (ODC), is a curve that plots the
Oxygen–hemoglobin dissociation curve
Oxygen–hemoglobin_dissociation_curve
Microorganism killed by normal atmospheric levels of oxygen
atmospheric concentrations of oxygen (20.95% O2). Oxygen tolerance varies between species, with some species capable of surviving in up to 8% oxygen, while
Obligate_anaerobe
Large body of salt water
hypoxia by 10%, and triple suboxic waters (oxygen concentrations 98% less than the mean surface concentrations), for each 1 °C of upper-ocean warming. The
Sea
Flow of oxygen from air to mitochondria
the oxygen concentration and lowering the PO2. As oxygen continues to flow down the concentration gradient from areas of higher concentration to areas of
Oxygen_cascade
Culture medium used in microbiology
diffusion of oxygen from the top of the broth, produces a range of oxygen concentrations in the medium along its depth. The oxygen concentration at a given
Thioglycolate_broth
Volumetric proportion of oxygen to other constituents in a breathing gas
blood and the oxygen concentration that is breathed. This helps to determine the degree of any problems with how the lungs transfer oxygen to the blood
Fraction_of_inspired_oxygen
Medical device
air-entrainment mask, is a medical device to deliver a known oxygen concentration to patients on controlled oxygen therapy. The mask was invented by Moran Campbell
Venturi_mask
Paleoproterozoic surge in atmospheric oxygen
atmosphere and shallow seas first experienced a rise in the concentration of free oxygen. This began approximately 2.46–2.426 billion years ago (Ga) during
Great_Oxidation_Event
Neoproterozoic surge in atmospheric oxygen
million years ago during the Neoproterozoic era, during which the oxygen concentration in Earth's atmosphere and oceans rose significantly. Taking place
Neoproterozoic oxygenation event
Neoproterozoic_oxygenation_event
Medical measurement
diff = Ca – Cv where: Ca = the oxygen concentration of arterial blood (oxygenated blood) Cv = the oxygen concentration of venous blood (deoxygenated blood)
Arteriovenous oxygen difference
Arteriovenous_oxygen_difference
Proposed deep-ocean oxygen production mechanism
is no correlation between nodule weight and oxygen production. The authors conclude the oxygen concentration increases are not related to polymetallic nodules
Dark_oxygen_production
Species of cephalopod
affect the concentration of oxygen available in the water. This can be understood through Henry's law, which states that the concentration of a gas in
Common_octopus
Microorganism requiring lower levels of oxygen than normally found in atmosphere
environment, using a probe to measure the oxygen concentration or redox potential in real time. Ways to control oxygen intake include gas-generating packs and
Microaerophile
Process by which gases diffuse through a biological membrane
concentration to a low concentration. A high oxygen concentration in the alveoli and low oxygen concentration in the capillaries causes oxygen to move into the
Gas_exchange
Organism not requiring oxygen for its growth
anaerobic organism or anaerobe is an organism that does not require molecular oxygen for growth or energy metabolism. Anaerobes produce adenosine triphosphate
Anaerobic_organism
Oxygen-carrying phytoglobin found in rhizome of leguminous plants
of atmospheric nitrogen. Leghemoglobin is shown to buffer the concentration of free oxygen in the cytoplasm of infected plant cells to ensure the proper
Leghemoglobin
Equipment which allows the user to breathe at hypoxic altitudes
by ambient air. In the absence of oxygen monitoring the user may not notice the reduction in oxygen concentration.[page needed] An additional potential
High-altitude breathing apparatus
High-altitude_breathing_apparatus
Device that removes nitrogen from air
keeping the concentration of oxygen in the pressure-equalizing reservoir from falling below about 90%. The pressure in the hose delivering oxygen from the
Oxygen_concentrator
Tendency for deep-sea species to be larger than their shallower-water relatives
food scarcity, reduced predation pressure and increased dissolved oxygen concentrations in the deep sea. The harsh conditions and inhospitality of the underwater
Deep-sea_gigantism
Toxic effects of breathing oxygen at high partial pressures
century. Oxygen toxicity is a concern for underwater divers, those on high concentrations of supplemental oxygen, and those undergoing hyperbaric oxygen therapy
Oxygen_toxicity
Usability in high-oxygen environments
Oxygen compatibility is the issue of compatibility of materials for service in high concentrations of oxygen. It is a critical issue in space, aircraft
Oxygen_compatibility
Interface between oxygen delivery system and human user
a nasal cannula but oxygen delivered in this way is less accurate and restricted in concentration. The global disposable oxygen masks market, according
Oxygen_mask
Device to detect the presence or absence of gases
concentration of gas, many large businesses use an automated test/calibration station for bump tests and calibrate their gas detectors daily. Oxygen deficiency
Gas_detector
Water quality modelling expression
equation determines the relation between the dissolved oxygen concentration and the biological oxygen demand over time and is a solution to the linear first
Streeter–Phelps_equation
Beings that can respire with and without oxygen
dynamic oxygen concentrations. Open biology, 2(7), 120091. https://doi.org/10.1098/rsob.120091 Unden, Gottfried; Trageser, Martin (1991). "Oxygen regulated
Facultative anaerobic organism
Facultative_anaerobic_organism
Body of salt water covering most of Earth
gradually less oxygen and gradually more carbon dioxide with more time away from the air at the surface. This gradual decrease in oxygen concentration happens
Ocean
Device used to provide oxygen therapy
A portable oxygen concentrator (POC) is a device used to provide oxygen therapy to people that require greater oxygen concentrations than the levels of
Portable_oxygen_concentrator
Effect of CO₂ on the oxygen binding affinity of hemoglobin
Hemoglobin's oxygen binding affinity (see oxygen–haemoglobin dissociation curve) is inversely related both to acidity and to the concentration of carbon
Bohr_effect
Organism that thrives in an oxygenated environment
production, but are harmed by atmospheric concentrations of oxygen (21% O2). Aerotolerant anaerobes do not use oxygen but are not harmed by it. When an organism
Aerobic_organism
Ways to test the suitability of wastewater
characteristics include pH value, dissolved oxygen concentrations, biochemical oxygen demand (BOD) and chemical oxygen demand (COD), nitrogen, phosphorus, chlorine
Wastewater_quality_indicators
Areas of seawater, freshwater, or groundwater that are depleted of dissolved oxygen
completely lacking in dissolved oxygen, often defined as having oxygen concentration less than 2 milligrams per litre. This condition is generally found
Anoxic_waters
Nontoxic or minimally toxic gas which can displace oxygen in breathing air
toxic gas which reduces or displaces the normal oxygen concentration in breathing air. Breathing of oxygen-depleted air can lead to death by asphyxiation
Asphyxiant_gas
Extinct order of dragonfly-like animals
atmospheric oxygen till the end of the Triassic Period, when birds began to emerge: "Maximum insect size decreased even as atmospheric [oxygen concentration] rose
Meganisoptera
Rapid or explosive burning of superheated gasses in a fire
or no oxygen can flow into the compartment. Then, because fires reduce oxygen, the oxygen concentration decreases. When the oxygen concentration becomes
Backdraft
Metalloprotein that binds with oxygen
Hgb) is a protein containing iron that facilitates the transportation of oxygen in red blood cells. Almost all vertebrates contain hemoglobin, with the
Hemoglobin
Measurement of blood oxygen saturation
spontaneous breathing Oxygen sensor – Device for measuring oxygen concentration Oxygen saturation – Measure of dissolved or carried oxygen Photoplethysmogram –
Pulse_oximetry
Topics referred to by the same term
measurement of dissolved oxygen concentration in soil or water Oxygen saturation (medicine), The percent of hemoglobin saturated by oxygen, usually in arterial
Oxygenation
Fuel for heating, cooking and vehicles
is suffocation due to LPG displacing air, causing a decrease in oxygen concentration. A full LPG gas cylinder contains 86% liquid; the ullage volume will
Liquefied_petroleum_gas
Lowest temperature at which a substance spontaneously combusts
elevated pressure and at 100% oxygen concentration. The resulting value is used as a predictor of viability for high-oxygen service. The main testing standard
Autoignition_temperature
Excess accumulation of fluid in the brain
reduce venous outflow. Decreased oxygen concentration in the blood, hypoxia, and increase in the carbon dioxide concentration in the blood, hypercapnia, are
Cerebral_edema
Medical condition
conditions of normal oxygen concentration, this causes no apparent effects on the structure of haemoglobin or its ability to transport oxygen around the body
Sickle_cell_disease
Abnormal heart blood flow pattern
Qp:Qs ratio Q p : Q s = change in oxygen concentration across the pulmonary circulation change in oxygen concentration across the systemic circulation =
Cardiac_shunt
Triatomic oxygen molecule
{\displaystyle V=V_{2}} . However, this equation depends on the concentration of oxygen (intermediate), which does not appear in the observed rate law
Ozone
Method of heat removal from components and industrial equipment
supplies include dissolved oxygen. Increasing oxygen concentrations accelerate corrosion. Dissolved oxygen approaches saturation levels in cooling towers
Water_cooling
Topics referred to by the same term
supply of oxygen Generalized hypoxia is hypoxia distributed amongst all tissues Latent hypoxia is artificially raised oxygen concentration in the blood
Hypoxia
Low-oxygen areas in coastal zones and lakes caused by eutrophication
zones are hypoxic (low-oxygen) areas in the world's oceans and large lakes. Hypoxia occurs when dissolved oxygen (DO) concentration falls to or below 2 mg
Dead_zone_(ecology)
Method for measuring oxygen level change in water
oxygen utilization (AOU) is the difference between oxygen gas solubility (i.e. the concentration at saturation) and the measured oxygen concentration
Apparent_oxygen_utilisation
Use of an inert gas to prevent formation of ignitable atmosphere
engineering terms, the admission of inert gas dilutes the oxygen below the limiting oxygen concentration. Assume a closed system containing a flammable gas,
Purging_(gas)
Introduction of inert gas to a closed system
the admission of inert gas can be said to dilute the oxygen below the limiting oxygen concentration. Inerting differs from purging. Purging, by definition
Inerting_(gas)
Principle applied to the measurement of blood flow to an organ
{O2}}}({\text{torr}})} Assuming a hemoglobin concentration of 15 g/dL and an oxygen saturation of 99%, the oxygen concentration of arterial blood is approximately
Fick_principle
producing oxygen as a waste product. The oxygen initially oxidizes dissolved iron in the oceans, creating iron ore – over time oxygen concentration in the
Timeline_of_Earth
Chamber in which fresh air is pumped in to help remove dangerous fumes
Kennedy, R. E. (1935). "Prevention of Gas Explosions by Controlling Oxygen Concentration". Industrial & Engineering Chemistry. 27 (11): 1344–1346. doi:10
Positive_pressure_enclosure
Reduction of nitrate as a form of anaerobic respiration
completing the nitrogen cycle. Denitrifying microbes require a very low oxygen concentration of less than 10%, as well as organic C for energy. Since denitrification
Denitrification
Supposed death from an electric fan
death from [an] increase of carbon dioxide saturation concentration and decrease of oxygen concentration. The risks are higher for the elderly and patients
Fan_death
Discrepancy of the lack of evidence for alien life despite its apparent likelihood
the critical level of atmospheric oxygen necessary for fire and combustion. Earth's atmospheric oxygen concentration is about 21%, but has been much lower
Fermi_paradox
Oxygen with all of its electrons spin paired
Singlet oxygen, systematically named dioxygen(singlet) and dioxidene, is a gaseous inorganic chemical with two oxygen atoms in a quantum state where all
Singlet_oxygen
Species of fly
and similar places containing water with high organic load and low oxygen concentration. Wing length is 8.25–12.75 mm. Antennomere 3 brown-black. Arista
Eristalis_pertinax
Effect of anesthesia
oxygen concentration when recovering from N2O administration. It is for this reason that Entonox, a 50:50 gaseous mixture of nitrous oxide and oxygen
Fink_effect
Polyphyletic group of bacteria
is believed to aid these organisms in reaching regions of optimal oxygen concentration. To perform this task, these bacteria have organelles called magnetosomes
Magnetotactic_bacteria
Test to determine the concentration of dissolved oxygen in water
The Winkler test is used to determine the concentration of dissolved oxygen in water samples. Dissolved oxygen (DO) is widely used in water quality studies
Winkler_titration
Medical condition due to rapid exposure to low oxygen at high altitude
lowest concentration of carbon dioxide at the end of the respiratory cycle, a measure of a higher alveolar ventilation) and corresponding high oxygen saturation
Altitude_sickness
Thermal tool that cuts dense heavy materials
heat from being dissipated in the bulk of the material. When the oxygen concentration is increased, steel wool will burn faster. Burning steel wool is
Thermal_lance
Low oxygen conditions or levels
reduced, restricting the supply of oxygen from the surface waters to the more saline bottom waters. The oxygen concentration in the bottom layer may then become
Hypoxia_(environmental)
Space with limited entry and egress and not suitable for human inhabitants
must be monitored continuously while the space is occupied. The oxygen concentration, the presence of toxic gases, and flammable material are the conditions
Confined_space
Technique for extracting gold from low-grade ore
leaching rate. Air or pure oxygen gas can be purged through the pulp to maximize the dissolved oxygen concentration. Intimate oxygen-pulp contactors are used
Gold_cyanidation
Mist-based plant growing process
compared to the submerged or un-misted sections. Even at the lowest oxygen concentration tested, the misted section demonstrated successful root development
Aeroponics
Measure of the transfer of gas from the lung to red blood cells
is proportional to the number of molecules in it). Further, the oxygen concentration (partial pressure) in the pulmonary artery is taken to be representative
Diffusing_capacity
Phenomenon in biochemistry
its variation with oxygen concentration, or oxygen pressure in air. Radiobiologists identified additional characteristics of the oxygen effect that influence
Oxygen_effect
Measure of the amount of oxygen that can be consumed by reactions in a solution
also be estimated from the concentration of oxidizable compound in the sample, based on its stoichiometric reaction with oxygen to yield CO2 (assume all
Chemical_oxygen_demand
Broad-spectrum poisoning
bypassing COX. Lactate is produced by anaerobic glycolysis when oxygen concentration becomes too low for the normal aerobic respiration pathway. Cyanide
Cyanide_poisoning
Species of fly
fish. “an oxygen concentration below 2.0 mg/l could not be tolerated by fish. Comparison of the depths at which this critical oxygen concentration occurred
Chaoborus_punctipennis
How deeply visible light penetrates through water
clarity is one way that humans measure water quality, along with oxygen concentration and the presence or absence of pollutants and algal blooms. Water
Water_clarity
Portable apparatus to recycle breathing gas
(CO2). The breathing reflex is triggered by CO2 concentration in the blood, not by the oxygen concentration, so even a small buildup of CO2 in the inhaled
Rebreather
Optical sensor device to measure a specific substance
to oxygen ratio is not linear, and an optode is most sensitive at low oxygen concentration, i.e., the sensitivity decreases as oxygen concentration increases
Optode
Adding air to water
and most other aquatic animals need oxygen, aerobic bacteria help decompose organic matter. When oxygen concentrations become low, anoxic conditions may
Water_aeration
Liquid state of nitrogen
will burn severely. As liquid nitrogen evaporates it reduces the oxygen concentration in the air and can act as an asphyxiant, especially in confined spaces
Liquid_nitrogen
Organism that requires oxygen to grow
obligate aerobe is an organism that requires oxygen to grow. Through cellular respiration, these organisms use oxygen to metabolise substances, like sugars or
Obligate_aerobe
Marine lake in Palau
layer (mixolimnion) and a lower anoxic layer (monimolimnion). The oxygen concentration in the lake declines from about 5 ppm at the surface to zero at 15
Jellyfish_Lake
physicochemical (pH, CO2, temperature, O2) factors. Oxygen plays an essential role in biological systems. Oxygen concentration control is one of the key elements when
Microfluidic_cell_culture
Model for understanding the 3 components of fire
sufficient oxygen, a fire cannot begin, and it cannot continue. With a decreased oxygen concentration, the combustion process slows. Oxygen can be denied
Fire_triangle
Ponds designed and built for wastewater treatment
[citation needed] However, these organisms use oxygen in their respiration, thus reducing the oxygen concentration in the surface waters. This is one of the
Waste_stabilization_pond
Science of inland aquatic ecosystems
dissolved oxygen; when dissolved oxygen concentrations are below 2 milligrams per liter, waters are considered hypoxic. When dissolved oxygen concentrations are
Limnology
Low levels of oxygen in bottom waters occurring regularly in the Baltic Sea
2009[update] the total area of bottom covered with hypoxic waters with oxygen concentrations less than 2 mg/L in the Baltic Sea has averaged 49,000 km2 over
Baltic_Sea_hypoxia
Device used for emergency oxygen therapy
low-flow nasal cannula, the NRB allows for the delivery of higher concentrations of oxygen. An ideal non-rebreather mask does not permit air from the surrounding
Non-rebreather_mask
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