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List of results

'''''J''max''' is t … '''''J''max''' is the maximum pathway flux (e.g. [[oxygen flux]]) obtained at saturating substrate concentration. ''J''max is a function of metabolic state. In hyperbolic ADP or oxygen kinetics, ''J''max is calculated by extrapolation of the hyperbolic function, with good agreement between the calculated and directly measured fluxes, when substrate levels are >20 times the ''c''50 or [[P50|''p''50]].[[P50|''p''50]]. +
'''''N,N,N',N'''-Tetramethyl-''p''-phenyle … '''''N,N,N',N'''-Tetramethyl-''p''-phenylenediamine dihydrochloride, TMPD''', is applied as an artificial substrate for reducing [[cytochrome c|cytochrome ''c'']] in the respirometric assay for [[Complex IV|cytochrome ''c'' oxidase]] (CIV) activity. It is maintained in a reduced state by [[ascorbate]] and undergoes [[autoxidation]] as a function of [[oxygen pressure]], TMPD, ascorbate and cytochrome ''c'' concentration.orbate and cytochrome ''c'' concentration. +
'''''p''50''' is th … '''''p''50''' is the oxygen partial pressure at which (a) respiratory flux is 50% of maximum oxygen flux, [[Jmax|''J''max]], at saturating oxygen levels. The oxygen affinity is indirectly proportional to the ''p''50. The ''p''50 depends on metabolic state and rate. (b) ''p''50 is the oxygen partial pressure at which oxygen binding (on myoglobin, haemoglobin) is 50%, or desaturation is 50%.n partial pressure at which oxygen binding (on myoglobin, haemoglobin) is 50%, or desaturation is 50%. +
'''2,4-dinitrophenole''' (C6H4N2O5; M = 184.11 g·mol-1) is a protonophore acting as an [[uncoupler]] of [[oxidative phosphorylation]]. +
'''2-Deoxyglucose''', also known as 2-deoxy-D-glucose is a glucose derivative that has the 2-hydroxyl group replaced by hydrogen. It competitively inhibits glycolysis by blocking hexokinase and phosphohexoseisomerase. +
'''2-mercaptoacetate''' is an inhibitor of … '''2-mercaptoacetate''' is an inhibitor of medium-chain acyl-CoA dehydrogenase, MCAD, the rate-limiting enzyme of [[octanoylcarnitine]] oxidation. 2-mercaptoacetate has been used as an inhibitor of [[fatty acid oxidation]] ([[F-pathway control state]]). In permeabilized rat soleus muscle fibers, pre-incubation with 1 mM 2-mercaptoacetate for 45 min resulted in 58% inhibition of MCAD and decreased [[octanoylcarnitine]]&[[malate]] stimulated respiration by approximately 60% ([[Osiki 2016 FASEB J]]).[[Osiki 2016 FASEB J]]). +
'''4'''#### '''''O2k-Catalogue: O2k-Modules'''''. O2k-Modules can be obtained with the O2k or added later, and can be simply installed by the user. +
'''4,5,6,7-Tetrachloro-2-trifluoromethylbenzimidazole''' is a protonophore or [[uncoupler]] of oxidative phosphorylation. +
'''8-Hydroxypyrene-1,3,6-trisulfonic acid trisodium salt (HPTS)''' is a ratiometric pH fluorophore; pKa = 7.3. Relative molecular mass: ''M''r = 524.39 +
'''AMP-activated protein kinase''' is a regulatory protein which acts as crucial cellular energy sensor by sensing AMP, [[ADP]] and/or Ca2+ levels in response to metabolic stresses or drug administration. +
'''ATP synthase''' or F-ATPase (F<sub&g … '''ATP synthase''' or F-ATPase (F1FO-ATPase; the use of Complex V is discouraged) catalyzes the [[endergonic]] phosphorylation of [[ADP]] to [[ATP]] in an over-all [[exergonic]] process that is driven by proton translocation along the [[protonmotive force]]. The ATP synthase can be inhibited by [[oligomycin]].[[oligomycin]]. +
'''ATPases''' are enzymes that hydrolyse [[ATP]] … '''ATPases''' are enzymes that hydrolyse [[ATP]], releasing [[ADP]] and [[inorganic phosphate]]. The contamination of isolated mitochondria with ATPases from other organelles and endogenous adenylates can lead to the production of ADP, which can stimulate respiration. This situation would lead to an overestimation of [[LEAK respiration]] measured in the absence of ADP, ''L''(n) and subsequent inhibition of respiration by oligomycin, ''L''(Omy). of respiration by oligomycin, ''L''(Omy). +
'''Acceleration''', '''''a''''', is the ch … '''Acceleration''', '''''a''''', is the change of [[velocity]] over time [m·s-2]. '''''a''''' = d'''''v'''''/d''t''The symbol ''g'' is used for acceleration of free fall. The standard acceleration of free fall is defined as ''g''n = 9.80665 [m·s-2].ned as ''g''n = 9.80665 [m·s-2]. +
'''Acclimation''' is an immediate time scale adaption expressing phenotypic plasticity in response to changes of a single variable under controlled laboratory conditions. +
'''Acclimatization''' is an immediate time scale adaption expressing phenotypic plasticity in response to changes of habitat conditions and life style where several variables may change simultaneously. +
'''Acyl-CoA dehydrogenases''' ACADs are lo … '''Acyl-CoA dehydrogenases''' ACADs are localized in the mitochondrial matrix. Several ACADs are distinguished: short-chain (SCAD), medium-chain (MCAD), and long-chain (LCAD). ACAD9 is expressed in human brain. ACADs catalyze the reaction:::: acyl-CoA + FAD → ''trans''-2-enoyl-CoA + FADH2→ ''trans''-2-enoyl-CoA + FADH2 +
'''Acyl-CoA oxidase''' is considered as a … '''Acyl-CoA oxidase''' is considered as a rate-limiting step in peroxysomal ''β''-oxidation, which carries out few ''β''-oxidation cycles, thus shortening very-long-chain fatty acids (>C20). Electrons are directly transferred from FADH2 to O2 with the formation of H2O2.t; to O2 with the formation of H2O2. +
'''Acylcarnitines''' are esters derivative … '''Acylcarnitines''' are esters derivative of [[carnitine]] and [[fatty acid]]s, involved in the metabolism of fatty acids. Long-chain acylcarnitines such as [[palmitoylcarnitine]] must be transported in this form, conjugated to carnitine, into the mitochondria to deliver fatty acids for fatty acid oxidation and energy production. Medium-chain acylcarnitines such as [[octanoylcarnitine]] are also frequently used for high-resolution respirometry.tly used for high-resolution respirometry. +
'''Adaptation''' is an evolutionary time scale expression of phenotypic plasticity in response to selective pressures prevailing under various habitat conditions. +
'''Add:''' A new graph is added at the bottom of the screen. Select plots for display in the new graph, Ctrl+F6. '''Delete: Delete one of the graphs displayed in DatLab. +
'''Additivity''' ''A''''α&β … '''Additivity''' ''A''''α&β'' describes the principle of substrate control of mitochondrial respiration with [[convergent electron flow]]. The '''additive effect of convergent electron flow''' is a consequence of electron flow converging at the '''[[Q-junction]]''' from respiratory Complexes I and II ([[NS-linked substrate state |NS or CI&II e-input]]). Further additivity may be observed by convergent electron flow through [[Glycerophosphate_dehydrogenase_Complex|glycerophosphate dehydrogenase]] and [[electron-transferring flavoprotein Complex]]. Convergent electron flow corresponds to the operation of the [[TCA cycle]] and mitochondrial substrate supply ''in vivo''. Physiological substrate combinations supporting convergent NS e-input are required for reconstitution of intracellular TCA cycle function. Convergent electron flow simultaneously through Complexes I and II into the [[Q-junction]] supports higher [[OXPHOS capacity]] and [[ET capacity]] than separate electron flow through either CI or CII. The convergent [[NS]] effect may be completely or partially additive, suggesting that conventional bioenergetic protocols with [[Mitochondrial preparations|mt-preparations]] have underestimated cellular OXPHOS-capacities, due to the gating effect through a single branch. Complete additivity is defined as the condition when the sum of separately measured respiratory capacities, N + S, is identical to the capacity measured in the state with combined substrates, NS (CI&II). This condition of complete additivity, NS=N+S, would be obtained if electron channeling through supercomplex CI, CIII and CIV does not interact with the pool of redox intermediates in the pathway from CII to CIII and CIV, and if the capacity of the phosphorylation system does not limit OXPHOS capacity ([[Excess E-P capacity factor |excess ''E-P'' capacity factor]] is zero). In most cases, however, additivity is incomplete, NS < N+S.Excess E-P capacity factor |excess ''E-P'' capacity factor]] is zero). In most cases, however, additivity is incomplete, NS < N+S. +
'''Adenine nucleotides''', which are also sometimes referred to as adenosines or adenylates, are a group of organic molecules including AMP, [[ADP]] and [[ATP]]. These molecules present the major players of energy storage and transfer. +
'''Adenosine diphosphate''' is a nucleotid … '''Adenosine diphosphate''' is a nucleotide. In [[OXPHOS]] core metabolism, ADP is a substrate of [[ANT]] and [[ATP synthase]] in the [[phosphorylation system]]. ADP is the discharged or low-energy counterpart of [[ATP]]. ADP can accept chemical energy by regaining a phosphate group to become ATP, in substrate-level phosphorylation (in anaerobic catabolism), at the expense of solar energy (in photosynthetic cells) or chemiosmotic energy (respiration in heterotrophic cells). ADP is added to [[mitochondrial preparations]] at kinetically saturating concentrations to induce the active state for evaluation of [[OXPHOS capacity]].[[OXPHOS capacity]]. +
'''Adenosine triphosphate''' is a nucleotid and functions as the major carrier of chemical energy in the cells. As it transfers its energy to other molecules, it looses its terminal phosphate group and becomes adenosine diphosphate ([[ADP]]). +
'''Adenylate kinase''', which is also called myokinase, is a phosphotransferase enzyme that is located in the mitochondrial intermembrane space and catalyzes the rephosphorylation of AMP to ADP in the reaction ATP + AMP ↔ ADP + ADP. +
'''Advancement per volume''' or volume-spe … '''Advancement per volume''' or volume-specific advancement, dtr''Y'', is related to [[advancement]] of a transformation, dtr''Y'' = dtr''ξ''∙''V''-1 [MU∙L-1]. Compare dtr''Y'' with the amount of substance ''j'' per volume, ''c''''j'' ([[concentration]]), related to [[amount]], ''c''''j'' = ''n''''j''∙''V''-1 [mol∙''V''-1]. Advancement per volume is particularly introduced for chemical reactions, dr''Y'', and has the dimension of concentration (amount per volume [mol∙L-1]). In an [[open system]] at steady-state, however, the concentration does not change as the reaction advances. Only in [[closed system]]s and [[isolated system]]s, specific advancement equals the change in concentration divided by the stoichiometric number, dr''Y'' = d''c''''j''/''ν''''j'' (closed system) dr''Y'' = dr''c''''j''/''ν''''j'' (general) With a focus on ''internal'' transformations (i; specifically: chemical reactions, r), d''c''''j'' is replaced by the partial change of concentration, dr''c''''j'' (a transformation variable or process variable). dr''c''''j'' contributes to the total change of concentration, d''c''''j'' (a system variable or variable of state). In open systems at steady-state, dr''c''''j'' is compensated by ''external processes'', de''c''''j'' = -dr''c''''j'', exerting an effect on the total concentration change of substance ''j'', d''c''''j'' = dr''c''''j'' + de''c''''j'' = 0 (steady state) d''c''''j'' = dr''c''''j'' + de''c''''j'' (general)sses'', de''c''''j'' = -dr''c''''j'', exerting an effect on the total concentration change of substance ''j'', d''c''''j'' = dr''c''''j'' + de''c''''j'' = 0 (steady state) d''c''''j'' = dr''c''''j'' + de''c''''j'' (general) +
'''Air calibration''' of an oxygen sensor … '''Air calibration''' of an oxygen sensor (polarographic oxygen sensor) is performed routinely on any day before starting a respirometric experiment. The volume fraction of oxygen in dry air is constant. An aqueous solution in equilibrium with air has the same partial pressure as that in water vapour saturated air. The water vapour is a function of temperature only. The partial oxygen pressure in aqueous solution in equilibrium with air is, therefore, a function of total barometric pressure and temperature. Bubbling an aqueous solution with air generates deviations from barometric pressure within small gas bubbles and is, therefore, not recommended. To equilibrate an aqueous solution ata known partial pressure of oxygen [kPa], the aqueous solution is stirred rigorously in a chamber enclosing air at constant temperature. The concentration of oxygen, ''c''O2 [µM], is obtained at any partial pressure by multiplying the partial pressure by the oxygen solubility, ''S''O2 [µM/kPa]. ''S''O2 is a function of temperature and composition of the salt solution, and is thus a function of the experimental medium. The [[Oxygen_solubility_factor|solubility factor]] of the medium, ''F''M, expresses the oxygen solubility relative to pure water at any experimental temperature. ''F''M is 0.89 in serum (37 °C) and 0.92 in [[MiR06]] or [[MiR05]] (30 °C and 37 °C).iR05]] (30 °C and 37 °C). +
'''Allegations of research misconduct''' a … '''Allegations of research misconduct''' are handled with care. Publishers and editors shall take reasonable steps to identify and prevent the publication of papers where research misconduct has occurred, including plagiarism, citation manipulation, and data falsification/fabrication, among others. In no case shall a journal or its editors encourage such misconduct, or knowingly allow such misconduct to take place. In the event that a journal's publisher or editors are made aware of any allegation of research misconduct relating to a published article in their journal, the publisher or editor shall follow [https://publicationethics.org/core-practices COPE's guidelines] (or equivalent) in dealing with allegations.r equivalent) in dealing with allegations. +
'''Alternative quinol oxidases''' AOX are … '''Alternative quinol oxidases''' AOX are membrane-bound enzymes capable of supporting [[cyanide]]- and [[antimycin A]]-resistant mitochondrial respiration. AOX catalyzes the oxidation of ubiquinol and the reduction of oxygen to water in a four-electron process. As this bypasses several proton-translocating steps, induction of this alternative pathway is associated with a reduction of ATP production per oxygen consumed. AOX is found in most plants (including microalgae), many fungi and protists, but is not expressed in animals. AOX is inhibited by [[salicylhydroxamic acid]] (SHAM). Expression and activity of the enzyme are modified by environmental conditions such as temperature, oxidative stress, nutrient availability, and pathogens such as viruses.ailability, and pathogens such as viruses. +
'''Aluminium trolley''' (700x500x60 mm); carrying capacity 120 kg; incl. packing box; for transport of O2k. '''Discontinued''' +
'''Amp calibration''' indicates the calibration of the amperometric O2k-channel. +
'''Amplex® UltraRed … '''Amplex® UltraRed''' (AmR) is used as an [[extrinsic fluorophores |extrinsic fluorophore]] for measurement of [[hydrogen peroxide]] production ([[ROS]]) by cells or mitochondrial preparations. The reaction of H2O2 and AmR is catalyzed by [[horseradish peroxidase]] to produce the red fluorescent compound [[resorufin]] (excitation wavelength 563 nm, emission 587 nm; the fluorescent product according to the supplier is called UltroxRed in the case of Amplex® UltraRed which has a similar structure to resorufin). The change of emitted fluorescence intensity is directly proportional to the concentration of H2O2 added, whereby the H2O2 is consumed.n of H2O2 added, whereby the H2O2 is consumed. +
'''Amytal''' sodium salt (synonym: amobarbital; 5-Ethyl-5-isoamylbarbituric acid) is a barbiturate drug and an inhibitor of [[Complex I]]. +
'''Anaerobic''' metabolism takes place wit … '''Anaerobic''' metabolism takes place without the use of molecular oxygen, in contrast to '''[[aerobic]]''' metabolism. The capacity for energy assimilation and growth under '''[[anoxic]]''' conditions is the ultimate criterion for '''facultative anaerobiosis'''. Anaerobic ''metabolism'' may proceed not only under [[anoxic]] ''conditions'' or ''states'', but also under [[hyperoxic]] and [[normoxic]] conditions ('''aerobic glycolysis'''), and under [[hypoxic]] and [[microxic]] conditions below the [[limiting oxygen pressure]].[[limiting oxygen pressure]]. +
'''Anaplerosis''' is the process of format … '''Anaplerosis''' is the process of formation of intermediates of the [[tricarboxylic acid cycle]]. [[Malic enzyme]] (mtME), [[phosphoenolpyruvate carboxykinase]] (PEPCK), propionyl-CoA carboxylase, [[pyruvate carboxylase]] and [[proline dehydrogenase]] play important roles in anaplerosis.[[proline dehydrogenase]] play important roles in anaplerosis. +
'''Anaplerotic pathway control states''' a … '''Anaplerotic pathway control states''' are fuelled by single substrates which are transported into the mitochondrial matrix and increase the pool of intermediates of the [[tricarboxylic acid cycle]]. [[Malic enzyme]] (mtME), phosphoenopyruvate carboxykinase (PEPCK), propionyl-CoA carboxylase, and pyruvate carboxylase play important roles in [[anaplerosis]]. The [[glutamate-anaplerotic pathway control state]] and [[malate-anaplerotic pathway control state]] are the most important anaplerotic substrate control states (aN).anaplerotic substrate control states (aN). +
'''Antimycin A''' is an inhibitor of [[Complex III]] … '''Antimycin A''' is an inhibitor of [[Complex III]] (CIII). It binds to the Qi site of CIII and inhibits the transfer of electrons from heme ''b''H to oxidized Q (Qi site inhibitor). High concentrations of antimycin A also inhibit acyl-CoA oxidase and D-amino acid oxidase.lso inhibit acyl-CoA oxidase and D-amino acid oxidase. +
'''Aqua destillata''' (a.d.) is the Latin … '''Aqua destillata''' (a.d.) is the Latin name for '''distilled [[water]]''', H2O. When a.d. is used in various solution protocols, it may indicate that water with the highest possible quality or lowest possible level of impurities should be used, as may be reached not only with distilled water but also with high-purity deionised water.illed water but also with high-purity deionised water. +
'''Artemisinin''' and various derivatives … '''Artemisinin''' and various derivatives are potent anti-malaria drugs which have additionally anti-tumorigenic effects, particularly when targeted at mitochondria. The anti-malaria effect is associated with artemisinin's action on heme. Mitochondria are involved in the synthesis of heme, and may play additional roles in the anti-tumorigenic effect of artemisinin.he anti-tumorigenic effect of artemisinin. +
'''Aspirin''' is a widely applied drug that requires dosage adjusted to individual body mass. It is a non-selective COX inhibitor and exerts an effect on long-chain fatty acid transport into mitochondria. +
'''Atractyloside''' is an inhibitor of the … '''Atractyloside''' is an inhibitor of the [[Adenine nucleotide translocator|adenine nucleotide translocator (ANT)]]. It is an extremely toxic glycoside that inhibits oxidative phosphorylation by blocking the transfer of adenosine nucleotides through the mitochondrial membrane.otides through the mitochondrial membrane. +
'''Attribute''' in general is a characteristic or property. In databases an attribute describes a column in a table. Rows then represent the according attribute values. +
'''Auranofin''' (AF) is a gold complex which inhibites thioredoxin reductase (TrxR). +
'''Automatic pan''' (only for real-time da … '''Automatic pan''' (only for real-time data recording) toggles automatic panning on/off by clicking in the [[O2k status line]]. If it is on (green), the time range is maintained while the time axis always shows the currently recorded data, i.e. the value of the offset (minimum value) increases as experimental time proceeds. If it is off (yellow), the time axis is static. This allows for manually panning backwards to observe previous sections of the experiment at a given time range. In this mode, the actual experimental time may be off-scale. Toggle between "Pan auto" and "Pan off" by a left-click on the text. It does not influence continuous data recording. It is recommended to maintain automatic panning on during the experiment, except for specifically viewing earlier sections of the experiment.iewing earlier sections of the experiment. +
'''Autoscale Y1 (Y2) axes''': Autoscaling the measured values (full data range) on the Y1 (Y2) axis in the selected [[plot]]. +
'''Autoscale time axis''' gives an overview of the entire experimental period. +
'''Autoscale''' zooms in or out of the selected period with [[Autoscale time axis]], [[Autoscale Y1 (Y2) axes]] and [[Automatic pan]]. +
'''Bandwidth''' is measured in nanometers in terms of the full width half maximum of a peak. This is the portion of the peak that is greater than half of the maximum intensity of that peak. +
'''Barometric pressure''', ''p'' … '''Barometric pressure''', ''p''b, is an important variable measured for calibration of oxygen sensors in solutions equilibrated with air. The atm-standard pressure (1 atm = 760 mmHg = 101.325 kPa) has been replaced by the SI standard pressure of 100 kPa. The partial pressure of oxygen, ''p''O2, in air is a function of barometric pressure, which changes with altitude and locally with weather conditions. The partial oxygen pressure declines by 12 % to 14 % per 1,000 m up to 6,000 m altitude, and by 15 % to 17 % per 1,000 m between 6,000 and 9,000 m altitude. The [[O2k-Barometric Pressure Transducer]] is built into the Oroboros O2k as a basis for accurate air calibrations in high-resolution respirometry. For highest-level accuracy of calculation of oxygen pressure, it is recommended to compare at regular intervals the barometric pressure recording provided by the O2k with a calibrated barometric pressure recording at an identical time point and identical altitude. The concept of gas pressure or barometric pressure can be related to the generalized concept of isomorphic [[pressure]].[[pressure]]. +
'''Basal respiration''' or '''basal metabo … '''Basal respiration''' or '''basal metabolic rate''' (BMR) is the minimal rate of metabolism required to support basic body functions, essential for maintenance only. BMR (in humans) is measured at rest 12 to 14 hours after eating in a physically and mentally relaxed state at thermally neutral room temperature. Maintenance energy requirements include mainly the metabolic costs of protein turnover and ion homeostasis. In many aerobic organisms, and particularly well studied in mammals, BMR is fully aerobic, i.e. direct calorimetry (measurement of [[heat dissipation]]) and indirect calorimetry (measurement of oxygen consumption multiplied by the [[oxycaloric equivalent]]) agree within errors of measurement (Blaxter KL 1962. The energy metabolism of ruminants. Hutchinson, London: 332 pp [1]). In many cultured mammalian cells, aerobic glycolysis contributes to total ATP turnover ([[Gnaiger_1990_Biochim Biophys Acta|Gnaiger and Kemp 1990]] [2]), and under these conditions, '[[respiration]]' is not equivalent to '[[metabolic rate]]'. Basal respiration in humans and skeletal muscle mitochondrial function (oxygen kinetics) are correlated ([[Larsen_2011_FASEB J|Larsen et al 2011]] [3]).» [[Basal_respiration#Basal_respiration_in_physiology.2C_cellular_bioenergetics_and_mitochondrial_physiology | '''MiPNet article''']][Basal_respiration#Basal_respiration_in_physiology.2C_cellular_bioenergetics_and_mitochondrial_physiology | '''MiPNet article''']] +
'''Bendavia''' ('''Elamipretide''') was de … '''Bendavia''' ('''Elamipretide''') was developed as a mitochondria-targeted drug against degenerative diseases, including cardiac ischemia-reperfusion injury. Clinical trials showed variable results. It is a cationic tetrapeptide which readily passes cell membranes, associates with [[cardiolipin]] in the mitochondrial inner membrane. Supercomplex-associated CIV activity significantly improved in response to elamipretide treatment in the failing human heart.tide treatment in the failing human heart. +
'''Beryllium sulfate''' is used in combination with [[sodium fluoride]] to form beryllium trifluoride (BeF3−), to inhibit the [[ATP synthase]] if it is exposed by disruption of the mitochondrial membranes. +
'''Bioactive mitObesity compounds''' are d … '''Bioactive mitObesity compounds''' are drugs and nutraceuticals with more or less reproducible beneficial effects in the treatment of diverse preventable degenerative diseases implicated in comorbidities linked to obesity, characterized by common mechanisms of action targeting mitochondria.chanisms of action targeting mitochondria. +
'''Biological reference interval''' or reference interval is the central 95 % interval of the distribution of reference values. +
'''Biopsy preservation solution''', for preservation of tissue samples, preparation of muscle fibres, and permeabilization with [[saponin]]. +
'''Blebbistatin''' is a widely used muscle … '''Blebbistatin''' is a widely used muscle and non-muscle myosin II-specific inhibitor that block contractile activity. Blebbistatin shows selectivity and high affinity for multiple class II myosins. Blebbistatin is commonly employed in respirometric experiments with permeabilized muscle fibers (pfi). Permeabilized muscle fibers are sensitive to low oxygen supply due to diffusion restrictions that limit mitochondrial respiration at the core of the fiber bundle. Therefore, hyperoxic conditions are required to counteract this limitation. Further studies have shown that the addition of blebbistatin in the respiration medium prevents fiber contraction, reduces the oxygen sensitivity and allows the study of ADP kinetics in pfi at normoxic oxygen levels. However, other studies described that the presence of blebbistatin does not prevent the oxygen dependence in pfi. Moreover, several limitations of blebbistatin i.e. low solubility in water, cytotoxicity and phototoxicity have been described.ity and phototoxicity have been described. +
'''Blood cell preparation''' (bcp) is one of the key steps in diagnostic protocols. +
'''Blood plasma''' is the non-cellular com … '''Blood plasma''' is the non-cellular component of the blood. Plasma lacks cellular components of the blood, [[red blood cell]]s, [[white blood cell]]s, and [[platelet]]s. However, there are many proteins in plasma, i.e. fibrinogen, albumin and globulin. Both blood plasma and [[platelet-rich plasma]] maintain clotting activity after whole blood separation.ing activity after whole blood separation. +
'''Blood serum''' is a purified plasma in … '''Blood serum''' is a purified plasma in which the coagulant components were removed from the [[blood plasma]]. It contains other substances, i.e. antibodies, antigens and hormones. Serum can be obtained by collecting the liquid phase after blood or plasma coagulation.d phase after blood or plasma coagulation. +
'''Bongkrekik acid''' is a selective and potent inhibitor of the [[adenine nucleotide translocator]] (ANT). Bka binds to the matrix (negative) site of ANT, opposite of [[carboxyatractyloside]]. +
'''CE''' marking is a mandatory conformity marking for certain products sold within the European Economic Area (EEA). +
'''CHNO-fuel substrates''' are reduced car … '''CHNO-fuel substrates''' are reduced carbon-hydrogen-nitrogen-oxygen substrates which are oxidized in the [[exergonic]] process of [[cell respiration]]. Mitochondrial pathways are stimulated by CHNO-fuel substrates feeding electrons into the [[ETS]] at different levels of integration and in the presence or absence of inhibitors acting on specific enzymes which are gate-keepers and control various pathway segments.pers and control various pathway segments. +
'''COPE core practices for research''' are applicable to all involved in publishing scholarly literature. +
'''Ca2+''' is a maj … '''Ca2+''' is a major signaling molecule in both prokaryotes and eukaryotes. Its cytoplasmic concentration is tightly regulated by transporters in the plasma membrane and in the membranes of various organelles. For this purpose, it is either extruded from the cell through exchangers and pumps or stored in organelles such as the endoplasmic reticulum and the mitochondria. Changes in the concentration of the cation regulate numerous enzymes including many involved in ATP utilizing and in ATP generating pathways and thus ultimately control metabolic activity of mitochondria and of the entire cell. Measuring changes in Ca2+ levels is thus of considerable interest in the context of [[high-resolution respirometry]].[[high-resolution respirometry]]. +
'''Calcium Green'''TM</sup&g … '''Calcium Green'''TM (CaG) denotes a family of [[extrinsic fluorophores]] applied for measurement of Ca2+ concentration with [[mitochondrial preparations]]. This dye fluoresces when bound to Ca2+. When measuring mitochondrial calcium uptake it is possible to observe the increase of the CaG signal upon calcium titration, followed by the decrease of CaG signal due to the uptake.n calcium titration, followed by the decrease of CaG signal due to the uptake. +
'''Calorespirometry''' is the method of me … '''Calorespirometry''' is the method of measuring simultaneously metabolic heat flux ([[calorimetry]]) and oxygen flux ([[respirometry]]). The [[calorespirometric ratio]] (CR ratio; heat/oxygen flux ratio) is thus experimentally determined and can be compared with the theoretical [[oxycaloric equivalent]], as a test of the aerobic energy balance., as a test of the aerobic energy balance. +
'''Carbohydrates''', also known as '''sacc … '''Carbohydrates''', also known as '''saccharides''', are molecules composed of carbon, hydrogen and oxygen. These molecules can be divided by size and complexity into monosaccharides, disaccharides, oligosaccharides, and polysaccharides. [[Glucose]] is a monosaccharide considered the primary source of energy in cells and a metabolic intermediate. This carbohydrate undergoes glycolysis, with the generation of [[pyruvate]], that can enter the [[TCA cycle]]. Carbohydrates such as glucose and fructose may also be involved in the [[Crabtree effect]].[[Crabtree effect]]. +
'''Carbonyl cyanide m-chlorophenyl hydrazo … '''Carbonyl cyanide m-chlorophenyl hydrazone''', CCCP (U; C9H5ClN4; ''F''W = 204.62) is a protonophore (H+ ionophore) and is used as a potent chemical [[uncoupler]] of [[oxidative phosphorylation]]. Like all uncouplers, CCCP concentrations must be titrated carefully to evaluated the optimum concentration for maximum stimulation of mitochondrial respiration, particularly to avoid inhibition of respiration at higher CCCP concentrations.ochondrial respiration, particularly to avoid inhibition of respiration at higher CCCP concentrations. +
'''Carboxy SNARF® 1''' is a cell-impermean … '''Carboxy SNARF® 1''' is a cell-impermeant pH indicator dye. The pKa of ~7.5 makes it useful for measuring pH in the range of pH 7 to pH 8. The emission shifts from yellow-orange at low pH to deep red fluorescence at high pH. Ratiometric fluorometry, therefore, is applied at two emission wavelengths,such as 580 nm and 640 nm.Relative molecular mass: ''M''r = 453.45molecular mass: ''M''r = 453.45 +
'''Carboxyatractyloside''' CAT is a highly … '''Carboxyatractyloside''' CAT is a highly selective and potent inhibitor of the [[adenine nucleotide translocator]] (ANT). CAT stabilizes the nucleoside binding site of ANT on the cytoplasmic (positive) side of the inner membrane and blocks the exchange of matrix ATP and cytoplasmic ADP. It causes stabilization of the ''c'' conformation of ANT leading to permeability transition pore (PTP) opening, loss of mitochondrial membrane potential, and apoptosis.ondrial membrane potential, and apoptosis. +
'''Cardiolipin''', CL, is a double phospho … '''Cardiolipin''', CL, is a double phospholipid (having 4 fatty acyl chains) in the mitochondrial inner membrane (mtIM) which plays an important role in mitochondrial bioenergetics. CL is involved in the mitochondria-dependent pathway of apoptosis, participates in the function and stabilization of mitochondrial respiratory complexes and supercomplexes and also contributes to mitochondrial integrity. Contributed by [[Sparagna G]] 2016-04-18[[Sparagna G]] 2016-04-18 +
'''Carnitine O-octanoyltransferase''' is a mitochondrial enzyme that transfers [[carnitine]] to octanoyl-CoA to form [[Coenzyme A]] and [[octanoylcarnitine]]: Octanoyl-CoA + L-carnitine ↔ CoA + L-octanoylcarnitine. +
'''Carnitine acetyltransferase''' (CrAT) i … '''Carnitine acetyltransferase''' (CrAT) is located in the mitochondrial matrix and catalyses the formation of acetyl-carnitine from acetyl-CoA and L-carnitine and thus regulates the acetyl-CoA/free CoA ratio which is essential for [[pyruvate dehydrogenase]] complex (PDC) activity.[[pyruvate dehydrogenase]] complex (PDC) activity. +
'''Carnitine acyltransferases''' mediate t … '''Carnitine acyltransferases''' mediate the transport of long-chain fatty acids across the inner mt-membrane by binding them to carnitine. First, long-chain fatty acids are activated by an energy-requiring step in which the fatty acid ester of CoA is formed enzymatically at the expense of ATP. The fatty acids then pass through the inner mt-membrane and enter the mitochondria as carnitine esters ([[acylcarnitine]]s). The fatty acyl group is then transferred from carnitine to intramitochondrial CoA and the resulting fatty acyl CoA is used as a substrate in the fatty acid oxidation (FAO) cycle in the mt-matrix.id oxidation (FAO) cycle in the mt-matrix. +
'''Carnitine palmitoyltransferase I''' (CP … '''Carnitine palmitoyltransferase I''' (CPT-I, also known as carnitine acyltransferase I) is a regulatory enzyme in mitochondrial long-chain acyl-CoA uptake and further oxidation. CPT-I is associated with the mt-outer membrane mtOM and catalyses the formation of [[acylcarnitine]]s from acyl-CoA and L-carnitine. In the next step, acyl-carnitines are transported to the mitochondrial matrix via [[carnitine-acylcarnitine translocase]] in exchange for free [[carnitine]]. In the inner side of the mtIM [[carnitine palmitoyltransferase II]] converts the acyl-carnitines to carnitine and acyl-CoAs. There are three enzyme isoforms: CPT-1A (liver type), CPT-1B (muscle type), CPT-1C (brain type). Isoforms have significantly different kinetic and regulatory properties. Malonyl-CoA is an endogenous inhibitor of CPT-I.l-CoA is an endogenous inhibitor of CPT-I. +
'''Carnitine palmitoyltransferase II''' (C … '''Carnitine palmitoyltransferase II''' (CPT-II, also known as carnitine acyltransferase II) is part of the carnitine shuttle which is responsible for the mitochondrial transport of long-chain fatty acids. CPT-II is located on the inner side of the mtIM and converts the [[acylcarnitine]]s (produced in the reaction catalyzed by [[carnitine palmitoyltransferase I]]) to carnitine and acyl-CoAs, which undergo ß-oxidation in the mitochondrial matrix. Free carnitines are transported out of the mitochondrial matrix in exchange for acyl-carnitines via an integral mtIM protein [[carnitine-acylcarnitine translocase]] (CACT). Short- and medium-chain fatty acids do not require the carnitine shuttle for mitochondrial transport.itine shuttle for mitochondrial transport. +
'''Carnitine''' is an important factor for … '''Carnitine''' is an important factor for the transport of long-chain fatty acids bound to carnitine ([[carnitine acyltransferase]]) into the mitochondrial matrix for subsequent β-oxidation. There are two enantiomers: D- and L-carnitine. Only the L-isomer is physiologically active.ly the L-isomer is physiologically active. +
'''Carnitine-acylcarnitine translocase''' … '''Carnitine-acylcarnitine translocase''' (CACT) is part of the carnitine shuttle which mediates the mitochondrial transport of long-chain fatty acids where the [[fatty acid oxidation]] occurs. CACT is an internal mt-IM protein and transports [[acylcarnitine]]s into the mitochondrial matrix in exchange for free [[carnitine]].[[carnitine]]. +
'''Carriers for malate: * [[dicarboxylate carrier]] * [[tricarboxylate carrier]] * [[2-oxoglutarate carrier]] +
'''Catalase''' catalyzes the dismutation o … '''Catalase''' catalyzes the dismutation of [[hydrogen peroxide]] to water and [[oxygen]]. Perhaps all cells have catalase, but mitochondria of most cells lack catalase. Cardiac mitochondria are exceptional in having mt-catalase activity (rat heart mitochondria: Radi et al 1991; mouse heart mitochondria: Rindler et al 2013). [[Hydroxylamine]] is an inhibitor of catalase, which is also inhibited by [[cyanide]] and [[azide]].Mitochondrial respiration medium [[MiR05]] was developed considering the intracellular conditions of mitochondria in living cells. In mitochondrial preparations, enzymes and substrates present in the cytosol (such as catalase) are diluted when the plasma membrane is removed. Therefore, the addition of catalase is recommended when working with mitochondrial preparations, to consume any H2O2 generated during the assay.2O2 generated during the assay. +
'''Catalytic activity''' of an enzyme is m … '''Catalytic activity''' of an enzyme is measured by an enzyme assay and is expressed in units of katal (kat [mol∙s-1]). More commonly (but not conforming to SI units or IUPAC recommendations) enzyme activity is expressed in units U [mol∙min-1].tivity is expressed in units U [mol∙min-1]. +
'''Cell culture media''', like RPMI or DMEM, used for [[HRR]] of living cells. +
'''Cell respiration''' channels metabolic … '''Cell respiration''' channels metabolic fuels into the chemiosmotic coupling (bioenergetic) machinery of [[oxidative phosphorylation]], being regulated by and regulating oxygen consumption (or consumption of an alternative final electron acceptor) and molecular redox states, ion gradients, mitochondrial (or microbial) membrane potential, the phosphorylation state of the ATP system, and heat dissipation in response to intrinsic and extrinsic energy demands. See also [[respirometry]].In internal or '''cell respiration''' in contrast to [[fermentation]], redox balance is maintained by external electron acceptors, transported into the cell from the environment. The chemical potential between electron donors and electron acceptors drives the [[electron transfer pathway]], generating a chemiosmotic potential that in turn drives ATP synthesis.tential that in turn drives ATP synthesis. +
'''Charge''' ''Q''el is the quantity of electricity expressed in the SI unit coulomb [C]. ''Q''el''X'' [C] indicates the charge carried by the quantity of a specified ion ''X''. +
'''Check for updates''' in the Help pull-d … '''Check for updates''' in the Help pull-down menu of DatLab 8 and follow the simple installation instruction if your computer (Linux or Windows) running DatLab is connected to the internet. Alternatively, use a different computer connected to the internet, download the [https://www.oroboros.at/index.php/download-update-datlab-8-for-linux/ update for Linux], and transfer it to the computer operating DatLab by USB. Check regularly for updates.atLab by USB. Check regularly for updates. +
'''Chinese numerals''' The Arabic numeral … '''Chinese numerals'''The Arabic numeral system used today in China was introduced to China by the Europeans in the early 17th century. But the Chinese character-based number systems are still in use. The financial numerals are used only when writing an amount on a form for remitting money at a bank. They function as anti-fraud numerals. The character 零 (zero) appeared very early in ancient Chinese writing. However, at that time, it did not mean "nothing", but "bits and pieces", "not much". 一百零五(105) means in Chinese: In addition to a hundred, there is a fraction of five. With the introduction of the Arabic numerals, 105 is exactly pronounced “one hundred zero five”, the character 零 corresponds exactly to the symbol 0. Thus, the character 零has the meaning of 0. But the character 〇 was one of the Chinese characters created and promulgated by the only empress (with greater achievements than countless emperors) in the history of China in 690 AD (much later than the invention of 0 in India) for the purpose of demonstrating her power. At that time the character 〇 meant “star”, representing a round planet. It is now used as a synonym for the 零 (zero). planet. It is now used as a synonym for the 零 (zero). +
'''Chloroplasts''' (Greek chloros: green; … '''Chloroplasts''' (Greek chloros: green; plastes: the one who forms) are small structures within the cells that conduct [[photosynthesis]]. They are a type of organelle called plastids that are present in eukaryotic plant cells (algae, aquatic and terrestrial plants) and characterized by having two membranes and a high concentration of the pigment Chlorophyll. Like [[mitochondria]], they originated through the endosymbiosis of a cyanobacteria by an early eukaryotic cell and they have their own DNA which replicates during cell division. In addition to photosynthesis, in their internal matrix called stroma they also carry out other metabolic functions within the plant cells such as fatty acid synthesis or amino acid synthesis.ty acid synthesis or amino acid synthesis. +
'''Choline dehydrogenase''' (EC 1.1.99.1) … '''Choline dehydrogenase''' (EC 1.1.99.1) is bound to the inner mt-membrane, oxidizes choline in kidney and liver mitochondria, with electron transfer into the [[Q-junction]], and is thus part of the [[Electron transfer pathway]]. Analogous to [[succinate dehydrogenase]] (CII), electron transfer from choline dehydrogenase is FAD-linked downstream to Q. Choline is an [[ET-pathway substrate types]] 3.[[ET-pathway substrate types]] 3. +
'''Citreoviridin''' is an inhibitor of the [[ATP synthase]] which, differently from the FO subunit binding inhibitor oligmycin, binds to the F1 subunit of the ATP synthase. +
'''Close and delete file'''. The decision to delete a DatLab file containing no useful data can be made most easily when viewing the traces. Only available when disconnected from the O2k. +
'''Coenzyme A''' is a coenzyme playing an essential role in the [[tricarboxylic acid cycle]] (oxidation of [[pyruvate]] to [[acetyl-CoA]]) and [[fatty acid oxidation]]. CoA is a thiol that reacts with carboxylic acids to form CoA-activated thioesters. +
'''Coenzyme Q''' or ubiquinone (2,3-dimeth … '''Coenzyme Q''' or ubiquinone (2,3-dimethoxy-5-methyl-6-polyprenyl-1,4-benzoquinone) was discovered in 1957 by the group of Crane. It is a lipid composed of a benzoquinone ring with an isoprenoid side chain, two methoxy groups and one methyl group. The length of the isoprenoid chain varies depending on the species; for example, six isoprenoid units (CoQ6) is the most commonly found CoQ in ''Saccharomyces cerevisiae'', eight units in ''Escherichia coli'' (CoQ8), nine units in ''Caenorhabditis elegans'' and rodents (CoQ9), ten units in humans (CoQ10), and some species have more than one CoQ form, e.g. human and rodent mitochondria contain different proportions of CoQ9 and CoQ10. These redox compounds exist in three different forms: [[quinone]] (oxidized), [[quinol]] (reduced), and an intermediate [[semiquinone]].''More details'' » '''[[Q-junction]]'''[Q-junction]]''' +
'''Comorbidities''' are common in obesogen … '''Comorbidities''' are common in obesogenic lifestyle-induced early aging. These are preventable, non-communicable diseases with strong associations to obesity. In many studies, cause and effect in the sequence of onset of comorbidities remain elusive. Chronic degenerative diseases are commonly obesity-induced. The search for the link between obesity and the etiology of diverse preventable diseases lead to the hypothesis, that mitochondrial dysfunction is the common mechanism, summarized in the term 'mitObesity'.nism, summarized in the term 'mitObesity'. +
'''Complex I''', '''NADH:ubiquinone oxidor … '''Complex I''', '''NADH:ubiquinone oxidoreductase''' (EC 1.6.5.3), is an enzyme complex of the [[Electron transfer pathway]], a [[proton pump]] across the inner mt-membrane, responsible for electron transfer to [[ubiquinone]] from [[NADH]] formed in the mt-matrix. CI forms a [[supercomplex]] with [[Complex III]]. There is a widespread ambiguity on the 'lonely H+ (the lonely [[hydron]])' surrounding Complex I: [[Ambiguity crisis - NAD and H+ |CI ambiguities]].[[Ambiguity crisis - NAD and H+ |CI ambiguities]]. +
'''Complex III''' or coenzyme Q : cytochro … '''Complex III''' or coenzyme Q : cytochrome c - oxidoreductase, sometimes also called the cytochrome ''bc''1 complex is a complex of the [[electron transfer pathway]]. It catalyzes the reduction of cytochrome ''c'' by oxidation of [[coenzyme Q]] (CoQ) and the concomitant [[Proton pump|pumping of 4 protons]] from the cathodic (negative) mitochondrial matrix to the anodic (positive) intermembrane space.l matrix to the anodic (positive) intermembrane space. +
'''Complex IV''' or '''cytochrome ''c'' ox … '''Complex IV''' or '''cytochrome ''c'' oxidase''' is the terminal oxidase of the mitochondrial [[electron transfer system]], reducing [[oxygen]] to [[water]], with reduced [[cytochrome c |cytochrome ''c'']] as a substrate. Concomitantly to that, CIV [[Proton pump|pumps protons]] against the electrochemical protonmotive force. CIV is frequently abbreviated as COX or CcO. It is the 'ferment' (Atmungsferment) of Otto Warburg, shown to be related to the cytochromes discovered by David Keilin.he cytochromes discovered by David Keilin. +
'''Concentrated ammonia solution''' (25 % … '''Concentrated ammonia solution''' (25 % - 30 % ammonium hydroxide solution, ammonia) is used for the service of the polarographic oxygen sensor OroboPOS. After opening the commercial solution, the concentration of ammonia may decline during storage and may render the ammonia stock ineffective for sensor service.'''Source:''' A commercially available solution from a drugstore is sufficient for this cleaning purposere is sufficient for this cleaning purpose +
'''Concentration''' [mol·L-1< … '''Concentration''' [mol·L-1] is a volume-specific quantity for diluted [[sample]]s s. In a concentration, the sample is expressed in a variety of [[format]]s: [[count]], amount, [[charge]], [[mass]], [[energy]]. In solution chemistry, amount concentration is [[amount of substance]] ''n''B per volume ''V'' of the solution, ''c''B = [B] = ''n''B·''V''-1 [mol·dm-3] = [mol·L-1]. The standard concentration, ''c''°, is defined as 1 mol·L-1 = 1 M. [[Count]] concentration ''CX'' = ''NX''·''V''-1 [x·L-1] is the concentration of the number ''NX'' of elementary entities ''X'', for which the less appropriate term 'number concentration' is used by [[Cohen 2008 IUPAC Green Book |IUPAC]]. If the sample is expressed as volume ''V''s (''e.g.'', ''V''O2), then the 'volume-concentration' of ''V''s in ''V'' is termed '[[volume fraction]]', ''Φ''s = ''V''s·''V''-1 (''e.g.'', volume fraction of O2 in dry air, ''Φ''O2) = 0.20946). [[Density]] is the mass concentration in a volume ''V''S of pure sample S. A ''change'' of concentration, d''c''X, in isolated or closed [[system]]s at constant [[volume]] is due to internal transformations ([[advancement per volume]]) only. In closed compressible systems (with a gas phase), the concentration of the gas changes, when pressure-volume work is performed on the system. In open systems, a change of concentration can additionally be due to [[external flow]] across the system boundaries.flow]] across the system boundaries. +
'''Connect to O2k''' connects DatLab with … '''Connect to O2k''' connects DatLab with the O2k. Select the [[USB port]] (or [[Serial port]]) with the corresponding cable connecting your PC to the O2k. Select the subdirectory for saving the [[DatLab data file| DLD file]]. Then data recording starts with experimental time set at zero.starts with experimental time set at zero. +
'''Coupled respiration''' drives oxidative … '''Coupled respiration''' drives oxidative phosphorylation of the diphosphate [[ADP]] to the triphosphate [[ATP]], mediated by proton pumps across the inner mitochondrial membrane. Intrinsically [[uncoupled respiration]], in contrast, does not lead to phosphorylation of ADP, despite of protons being pumped across the inner mt-membrane. Coupled respiration, therefore, is the coupled part of respiratory oxygen flux that pumps the fraction of protons across the inner mt-membrane which is utilized by the phosphorylation system to produce ATP from ADP and Pi. In the OXPHOS state, mitochondria are in a partially coupled state, and the corresponding coupled respiration is the [[free OXPHOS capacity]]. In the state of ROUTINE respiration, coupled respiration is the [[free ROUTINE activity]].[[free ROUTINE activity]]. +