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A list of all pages that have property "Description" with value "The '''O2k-Accessory Box''' contains components of the [[POS-Service Kit". Since there have been only a few results, also nearby values are displayed.

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  • Mitochondrial density  + (Specific '''mitochondrial density''' is ''Specific '''mitochondrial density''' is ''D<sub>mtE</sub>'' = ''mtE''·''m<sub>X</sub>''<sup>-1</sup> [mtEU·kg<sup>-1</sup>]. If the amount of mitochondria, ''mtE'', is expressed as mitochondrial mass, then ''D<sub>mtE</sub>'' is the mass fraction of mitochondria in the sample. If ''mtE'' is expressed as mitochondrial volume, ''V''<sub>mt</sub>, and the mass of sample, ''m<sub>X</sub>'', is replaced by volume of sample, ''V<sub>X</sub>'', then ''D<sub>mtE</sub>'' is the volume fraction of mitochondria in the sample.eplaced by volume of sample, ''V<sub>X</sub>'', then ''D<sub>mtE</sub>'' is the volume fraction of mitochondria in the sample.)
  • Resolution  + (Spectral resolution is a measure of the abSpectral resolution is a measure of the ability of an instrument to differentiate between two adjacent wavelengths. Two wavelengths are normally considered to be resolved if the minimum detector output signal (trough) between the two peaks is lower than 80 % of the maximum. The resolution of a [[spectrofluorometer]] or [[spectrophotometer]] is dependent on its [[bandwidth]].[[bandwidth]].)
  • Stop measurement  + (Stop data acquisition. The [[DatLab data file]] will be saved automatically.)
  • Custom-made stoppers  + (Stoppers can be custom-made for applications with user-specific sensors according to customer specifications.)
  • Tartronic acid  + (Tartronic acid (hydroxymalonic acid, C3H4O5; molecular weight 120.06) is an inhibitor of [[malic enzyme]].)
  • Taurine  + (Taurine, or 2-Aminoethan sulfonic acid, isTaurine, or 2-Aminoethan sulfonic acid, is one of the most abundant low-molecular-weight organic constituents in animals and humans. It has a multitude of functions in different types of tissue, one of which is the stabilization of membranes. Because of this and its antioxidative effect, taurine is a component of the respiration media MiR05 and MiR06 to preserve mitochondrial function. MiR06 to preserve mitochondrial function.)
  • Chinese Society of Mitochondrial Research and Medicine  + (The '''Chinese Society of Mitochondrial Research and Medicine''' (Chinese-Mit) is a member of [[Asian Society for Mitochondrial Research and Medicine|ASMRM]].)
  • Crabtree effect  + (The '''Crabtree effect''' describes the obThe '''Crabtree effect''' describes the observation that respiration is frequently inhibited when high concentrations of glucose or fructose are added to the culture medium - a phenomenon observed in numerous cell types, particularly in proliferating cells, not only tumor cells but also bacteria and yeast. The Pasteur effect (suppression of glycolysis by oxygen) is the converse of the Crabtree effect (suppression of respiration by high concentration of glucose or fructose).igh concentration of glucose or fructose).)
  • Default label  + (The '''Default label''' is the system default value for the axis label. These labels are changed automatically, according to the selected channel and unit. To change this label enter a [[Custom label]].)
  • Directory of Open Access Journals  + (The '''Directory of Open Access Journals''' is a free online directory that indexes and provides access to open access peer-reviewed journals.)
  • Exclusion criteria  + (The '''Exclusion criteria''' include factors or characteristics that make the recruited population ineligible for the outcome parameter. With the [[Inclusion criteria]], this factor must be a cofounder for the outcome parameter)
  • Faraday constant  + (The '''Faraday constant''' ''F'' links theThe '''Faraday constant''' ''F'' links the electric charge [C] to amount [mol], and thus relates the [[electrical format]] <u>''e''</u> [C] to the [[molar format]] <u>''n''</u> [mol]. The Farady constant, ''F'' = ''e''·''N''<sub>A</sub> = 96 485.33 C/mol, is the product of [[elementary charge]], ''e'' = 1.602176634∙10<sup>-19</sup> C/x, and the [[Avogadro constant]], ''N''<sub>A</sub> = 6.02214076∙10<sup>23</sup> x/mol. The dimensionless unit [x] is not explicitely considered by IUPAC.= 6.02214076∙10<sup>23</sup> x/mol. The dimensionless unit [x] is not explicitely considered by IUPAC.)
  • Inclusion criteria  + (The '''Inclusion criteria''' are based on The '''Inclusion criteria''' are based on key features of the target population that the researchers will use to answer their question. These criteria should identify the study population in a consistent, reliable, uniform, and objective manner. With the [[Exclusion criteria]], this factor must be a cofounder for the outcome parametert be a cofounder for the outcome parameter)
  • International Standard Serial Number  + (The '''International Standard Serial NumbeThe '''International Standard Serial Number''', ISSN, is a code used to identify periodical publications, independent of which media are used (print and/or electronic). - [[Bioenergetics Communications]], BEC: [https://portal.issn.org/resource/ISSN/2791-4690 ISSN 2791-4690]rg/resource/ISSN/2791-4690 ISSN 2791-4690])
  • International System of Units  + (The '''International System of Units''' (SThe '''International System of Units''' (SI) is the modern form of the metric system of [[unit]]s for use in all aspects of life, including international trade, manufacturing, security, health and safety, protection of the environment, and in the basic science that underpins all of these. The system of quantities underlying the SI and the equations relating them are based on the present description of nature and are familiar to all scientists, technologists and engineers. </br></br>The definition of the SI units is established in terms of a set of seven defining constants. The complete system of units can be derived from the fixed values of these defining constants, expressed in the units of the SI. These seven defining constants are the most fundamental feature of the definition of the entire system of units. These particular constants were chosen after having been identified as being the best choice, taking into account the previous definition of the SI, which was based on seven base units, and progress in science (p. 125).e units, and progress in science (p. 125).)
  • International Union of Pure and Applied Chemistry, IUPAC  + (The '''International Union of Pure and AppThe '''International Union of Pure and Applied Chemistry''' (IUPAC) celebrated in 2019 the 100<sup>th</sup> anniversary, which coincided with the [https://iupac.org/united-nations-proclaims-international-year-periodic-table-chemical-elements/ International Year of the Periodic Table of Chemical Elements (IYPT 2019)]. IUPAC {''Quote''} notes that marking Mendeleev's achievement will show how the periodic table is central to connecting cultural, economic, and political dimensions of global society “through a common language” {''end of Quote''} (Horton 2019). 2019 is proclaimed as the [https://iupac.org/united-nations-proclaims-international-year-periodic-table-chemical-elements/ International Year of the Periodic Table of Chemical Elements (IYPT 2019)]. For a '''common language''' in mitochondrial physiology and bioenergetics, the IUPAC ''Green book'' (Cohen et al 2008) is a most valuable resource, which unfortunately is largely neglected in bioenergetics textbooks. Integration of [[ergodynamics |open systems and non-equilibrium thermodynamic]] approaches remains a challenge for developing a common language (Gnaiger 1993; [[BEC 2020.1]]).C 2020.1]]).)
  • Korean Society of Mitochondrial Research and Medicine  + (The '''Korean Society of Mitochondrial Research and Medicine''' (KSMRM) is a member of [[Asian Society for Mitochondrial Research and Medicine|ASMRM]].)
  • MitoFit DOI Data Center  + (The '''MitoFit DOI Data Center''' is respoThe '''MitoFit DOI Data Center''' is responsible for the provision of digital identifiers, for the storage and ensuring the persistence of the scientific objects, the provision of access, review process and maintenance of the Metadata, and quality control.ance of the Metadata, and quality control.)
  • Mitochondrial Physiology Network  + (The '''Mitochondrial Physiology Network''' is the on-line Oroboros journal.)
  • N/NS pathway control ratio  + (The '''N/NS [[pathway control ratio]]The '''N/NS [[pathway control ratio]]''' is obtained when succinate is added to N-linked respiration in a defined coupling state. N and NS are abbreviations for respiration in the [[N-pathway control state]] (with pyruvate, glutamate, malate, or other ETS competent N-linked substrate combinations) and the [[NS-pathway control state]] (N in combination with succinate). NS indicates respiration with a cocktail of substrates supporting the N- and S-pathways.bstrates supporting the N- and S-pathways.)
  • N/S pathway control ratio  + (The '''N/S [[pathway control ratio]]The '''N/S [[pathway control ratio]]''' is obtained from SUIT protocols when the [[N-pathway control state |N-pathway flux]] and [[S-pathway control state |S-pathway flux]] are measured in the same [[coupling control state]]. The N/S pathway control ratio may be larger or smaller than 1.0, depending on the mitochondrial source and various mitochondrial injuries. The S-pathway control state may be selected preferentially as reference state, if mitochondria are studied with respect to N-pathway injuries.tudied with respect to N-pathway injuries.)
  • NS-N pathway control efficiency  + (The '''NS-N [[pathway control efficiency]]''', ''j''<sub>NS-N</sub> = 1-N/NS, expresses the fractional change of flux when succinate is added to the [[N-pathway control state]] in a defined [[coupling-control state]].)
  • NS-S pathway control efficiency  + (The '''NS-S pathway control efficiency''' The '''NS-S pathway control efficiency''' expresses the relative stimulation of succinate supported respiration (S) by NADH-linked substrates (N), with the [[S-pathway control state]] as the [[background state]] and the [[NS-pathway control state]] as the [[reference state]]. In typical [[SUIT protocol]]s with [[Electron-transfer-pathway state |type N and S substrates]], flux in the [[NS-pathway control state]] NS is inhibited by [[rotenone]] to measure flux in the [[S-pathway control state]], S(Rot) or S. Then the NS-S pathway control efficiency in the ET-coupling state is</br> ''j''<sub>(NS-S)''<sub>E</sub>''</sub> = (NS''<sub>E</sub>''-S''<sub>E</sub>'')/NS''<sub>E</sub>''</br>The NS-S pathway control efficiency expresses the fractional change of flux in a defined [[coupling-control state]] when inhibition by [[rotenone]] is removed from flux under S-pathway control in the presence of a type N substrate combination. Experimentally rotenone Rot is added to the NS-state. The reversed protocol, adding N-substrates to a S-pathway control background does not provide a valid estimation of S-respiration with succinate in the absence of Rot, since [[oxaloacetate]] accumulates as a potent inhibitor of [[succinate dehydrogenase]] CII.[[succinate dehydrogenase]] CII.)
  • O2k signal line  + (The '''O2k signal line''' is underneath thThe '''O2k signal line''' is underneath the [[O2k status line]]. It shows, depending on the [[O2k series]], on the left side the O2k number, the time of the experiment, the oxygen raw signal of each chamber, the [[block temperature]], the [[barometric pressure]], the Peltier power, the recorded amperometric and potentiometric raw signal, the enviromental (room) temperature and the signal from internal sensors recording the humidity and temperature of the electronics. On the right side of the O2k signal line the current [[User code - DatLab|user]], the DatLab version and the [[O2k serial number]] are displayed.[[O2k serial number]] are displayed.)
  • O2k-Accessory Box  + (The '''O2k-Accessory Box''' contains components of the [[POS-Service Kit]] and the [[O2k-Assembly Kit]] and is shipped with the O2k.)
 (The '''O2k-Accessory Box''' contains components of the [[POS-Service Kit)
  • O2k-Assembly Kit  + (The '''O2k-Assembly Kit''' is a component The '''O2k-Assembly Kit''' is a component of the [[Oroboros O2k]], consisting of 2 [[Stirrer-Bar\white PVDF\15x6 mm|PVDF Stirrer-Bars]], 2 [[PEEK]] O2k-Stoppers, [[OroboPOS-Connector]]s for O2k-series A-I and NextGen-O2k series XA (attached to the [[O2k-Main Unit]]) and cables (power supply, USB-connection). Several components of the O2k-Assembly Kit are included in the [[O2k-Accessory Box]] either for shipment or for storage.[[O2k-Accessory Box]] either for shipment or for storage.)
  • O2k-Fluo Smart-Module  + (The '''O2k-Fluo Smart-Module''' is an ampeThe '''O2k-Fluo Smart-Module''' is an amperometric add-on module to the [[Startup_O2k-Respirometer| O2k-Respirometer]], adding a new dimension to high-resolution respirometry. Optical sensors are inserted through the front window of the O2k-glass chambers, for measurement of hydrogen peroxide production (Amplex® UltraRed), ATP production (Magnesium Green™), mt-membrane potential (Safranin, TMRM), Ca<sup>2+</sup> (Calcium Green™), and numerous other applications open for O2k-user innovation. </br></br>::: » [[MiPNet28.09 O2k-Fluo Smart-Module manual]]et28.09 O2k-Fluo Smart-Module manual]])
  • O2k-Main Basic  + (The '''O2k-Main Basic''' is an integral elThe '''O2k-Main Basic''' is an integral element of the [[O2k-Main Unit]]. The Oroboros O2k Main Basic has the following components:</br>*Stainless-Steel Housing</br>*Switching power supply</br>*Microprocessor for integrated control, A/D converters and data handling</br>*Copper-Block with windows to 2 O2k-Chambers</br>*2 Amperometric OroboPOS Plugs</br>*TIP2k socket, providing the basis for add-on of the [[TIP2k]]</br>*2 Potentiometric Plugs for ion sensitive electrodes (ISE: TPP+, Ca2+; pH), providing the basis for add-on of the [[O2k-MultiSensor]] Modules</br>*2 Amperometric Plugs, providing the basis for add-on of the [[O2k-Fluo LED2-Module]] or NO (H<sub>2</sub>S) sensors.</br>*USB-Port for connection with DatLab (PC or laptop not included)for connection with DatLab (PC or laptop not included))
  • O2k-Main Unit  + (The '''O2k-Main Unit''' is a component of The '''O2k-Main Unit''' is a component of the [[O2k-Core]]. The O2k-Main Unit consists of functionally defined, integral elements, the ([[O2k-Main Basic]], [[O2k-Peltier Temperature Control]], two [[O2k-Electromagnetic Stirrer Twin-Control]] units, two [[O2k-Amperometric OroboPOS Twin-Channel]]s, [[O2k-Barometric Pressure Transducer]]), which cannot be obtained separately.[[O2k-Barometric Pressure Transducer]]), which cannot be obtained separately.)
  • O2k chamber volume calibration  + (The '''O2k-chamber volume calibration''' has to be done before getting started with the [[Oroboros O2k]] to guarantee a standard [[chamber volume]] of 2.0 mL.)
  • O2k-ticket system  + (The '''O2k-ticket system''' is a customer The '''O2k-ticket system''' is a customer support platform based on Zammad. This system automatically attributes an unique Ticket number (which is visible on the subject of your e-mail) to each received customer inquiry. For an easy follow-up, all the related correspondence is collected under this Ticket number. </br></br>* Contact us: '''[email protected]'''</br></br>In order to provide a helpful and reliable support regarding your O2k/equipment, we suggest to include in your inquiries:</br></br>* your affiliation and your O2k-serial number - ''See'': [[O2k_series]]</br></br>* DLD file(s) with your reported issue accompanied by a brief explanation. issue accompanied by a brief explanation.)
  • Oxygen sensor test  + (The '''O<sub>2</sub> sensor teThe '''O<sub>2</sub> sensor test''' is an important component of [[MitoPedia: Oroboros QM |Oroboros Quality Management]]. The [[OroboPOS]] test is described in detail in [[MiPNet06.03 POS-calibration-SOP]], is performed after switching on the [[Oroboros O2k]], and is required as a basis of technical service of the instrument.red as a basis of technical service of the instrument.)
  • OXPHOS International  + (The '''OXPHOS International''' web portal is a repository of information useful to scholars studying mitochondria. The site is operated as a private "special interests" community hub.)
  • Oroboros USB-flash drive  + (The '''Oroboros USB-flash drive''' is deliThe '''Oroboros USB-flash drive''' is delivered with the [[Oroboros O2k]]. Copy the folder "Oroboros O2k-Course on HRR" from the '''Oroboros USB-flash drive''' to your computer. This folder contains the DatLab installation program as well as tools to find topics, O2k-manuals and O2k-protocols with corresponding DatLab demo files and templates for training with [[DatLab]].[[DatLab]].)
  • Q-redox state  + (The '''Q-redox state''' reflects the redoxThe '''Q-redox state''' reflects the redox status of the [[Q-junction]] in the mitochondrial or chloroplast [[ETS|electron transfer system (ETS)]]. [[Coenzyme Q]] (CoQ or Q, [[ubiquinone]]) is a mobile redox component located centrally in the mitochondrial [[ETS]], while plastoquinones are essential mobile components in the photosynthetic system with a similar function. The Q-redox state depends on the balance between reducing capacities of convergent electron entries from fuel substrates into the Q-junction and oxidative capacities downstream of Q to the electron acceptor oxygen. Therefore, deficiencies in the mitochondrial [[ETS]], originating from e.g. the malfunction of respiratory Complexes, can be detected by measuring the changes of the Q-redox state with respect to the respiratory activity.</br></br>A three-electrode system was implemented into the NextGen-O2k to monitor the Q-redox state continuously and simultaneously with respiratory oxygen consumption. Added CoQ2 reflects the mitochondrial Q-redox state when equilibrating both with the detecting electrode and the biological sites (e.g. Complexes I, II and III).ical sites (e.g. Complexes I, II and III).)
  • S/NS pathway control ratio  + (The '''S/NS [[pathway control ratio]]The '''S/NS [[pathway control ratio]]''' is obtained when [[rotenone]] (Rot) is added to the [[NS-pathway control state]] in a defined [[coupling control state]]. The reversed protocol, adding N-type substrates to a [[S-pathway control state]] as the [[background state]] does not provide a valid estimation of S-linked respiration with succinate in the absence of Rot, since [[oxaloacetate]] accumulates as a potent inhibitor of [[succinate dehydrogenase]] (CII).[[succinate dehydrogenase]] (CII).)
  • SUIT protocol pattern  + (The '''SUIT protocol pattern''' describes the type of the sequence of coupling and substrate control steps in a SUIT protocol, which may be liner, orthogonal, or diametral.)
  • Science Citation Index  + (The '''Science Citation Index''' SCI offers bibliographical access to a curated collection of journals across 178 scientific disciplines. The SCI provides gold-standard lists of established journals.)
  • SUIT protocol library  + (The '''Substrate-uncoupler-inhibitor titraThe '''Substrate-uncoupler-inhibitor titration (SUIT) protocol library''' contains a sequential list of SUIT protocols (D001, D002, ..) with links to the specific SUIT pages. Classes of [[SUIT|SUIT protocols]] are explained with coupling and substrate control defined for [[mitochondrial preparations]].[[mitochondrial preparations]].)
  • Taiwan Society for Mitochondrial Research and Medicine  + (The '''Taiwan Society for Mitochondrial Research and Medicine''' (TSMRM) is a member of [[Asian Society for Mitochondrial Research and Medicine|ASMRM]].)
  • USB port  + (The '''USB port''' describes the connection between O2k and Computer. With the USB cable connected, select '''USB port''' in the [[Connection window]]. Depending on the O2k series, it is possible to connect with a '''USB port''' or [[Serial port]].)
  • Abscissa  + (The '''abscissa''' is the horizontal axis The '''abscissa''' is the horizontal axis ''x'' of a rectangular two-dimensional graph with the [[ordinate]] ''y'' as the vertical axis. Values ''X'' are placed horizontally from the origin.</br></br>See [[Abscissal X/Y regression |Abscissal ''X''/''Y'' regression]].[[Abscissal X/Y regression |Abscissal ''X''/''Y'' regression]].)
  • Accuracy  + (The '''accuracy''' of a method is the degree of agreement between an individual test result generated by the method and the true value.)
  • Activity  + (The '''activity''' (relative activity) is The '''activity''' (relative activity) is a dimensionless quantity related to the concentration or partial pressure of a dissolved substance. The activity of a dissolved substance B equals the [[concentration]], ''c''<sub>B</sub> [mol·L<sup>-1</sup>], at high dilution divided by the unit concentration, ''c''° = 1 mol·L<sup>-1</sup>: </br> ''a''<sub>B</sub> = ''c''<sub>B</sub>/''c''°</br>This simple relationship applies frequently to substances at high dilutions <10 mmol·L<sup>-1</sup> (<10 mol·m<sup>-3</sup>). In general, the concentration of a [[solute]] has to be corrected for the activity coefficient (concentration basis), ''γ''<sub>B</sub>,</br> ''a''<sub>B</sub> = ''γ''<sub>B</sub>·''c''<sub>B</sub>/''c''°</br>At high dilution, ''γ''<sub>B</sub> = 1. In general, the relative activity is defined by the [[chemical potential]], ''µ''<sub>B</sub></br> ''a''<sub>B</sub> = exp[(''µ''<sub>B</sub>-''µ''°)/''RT'']potential]], ''µ''<sub>B</sub> ''a''<sub>B</sub> = exp[(''µ''<sub>B</sub>-''µ''°)/''RT''])
  • Adenine nucleotide translocase  + (The '''adenine nucleotide translocator''',The '''adenine nucleotide translocator''', ANT, exchanges [[ADP]] for [[ATP]] in an electrogenic antiport across the inner mt-membrane. The ANT is inhibited by [[atractyloside]], [[carboxyatractyloside|carboxyatractyloside]] and [[bongkrekik acid]]. The ANT is a component of the [[phosphorylation system]].[[phosphorylation system]].)
  • Advantage of preprints  + (The '''advantages of preprints''', the excitement and concerns about the role that preprints can play in disseminating research findings in the life sciences are discussed by N Bhalla (2016).)
  • Aerobic  + (The '''aerobic''' state of metabolism is dThe '''aerobic''' state of metabolism is defined by the presence of oxygen (air) and therefore the potential for oxidative reactions (ox) to proceed, particularly in [[oxidative phosphorylation]] (OXPHOS). Aerobic metabolism (with involvement of oxygen) is contrasted with [[anaerobic]] metabolism (without involvement of oxygen): Whereas anaerobic ''metabolism'' may proceed in the absence or presence of oxygen (anoxic or oxic ''conditions''), aerobic ''metabolism'' is restricted to oxic ''conditions''. Below the [[critical oxygen pressure]], aerobic ATP production decreases.[[critical oxygen pressure]], aerobic ATP production decreases.)
  • Amount of substance  + (The '''amount of substance''' ''n'' is a bThe '''amount of substance''' ''n'' is a base physical quantity, and the corresponding SI unit is the [[mole]] [mol]. Amount of substance (sometimes abbreviated as 'amount' or 'chemical amount') is proportional to the number ''N''<sub>''X''</sub> of specified elementary entities ''X'', and the universal proportionality constant is the reciprocal value of the [[Avogadro constant]] ([[Bureau International des Poids et Mesures_2019_The International System of Units (SI) |SI]]),</br> ''n''<sub>''X''</sub> = ''N''<sub>''X''</sub>·''N''<sub>A</sub><sup>-1</sup></br></br>''n''<sub>''X''</sub> contained in a system can change due to internal and external transformations,</br> d''n''<sub>''X''</sub> = d<sub>i</sub>''n''<sub>''X''</sub> + d<sub>e</sub>''n''<sub>''X''</sub></br></br>In the absence of nuclear reactions, the amount of any atom is conserved, ''e.g.'', for carbon d<sub>i</sub>''n''<sub>C</sub> = 0. This is different for chemical substances or ionic species which are produced or consumed during the [[advancement]] of a reaction r, </br>:::: [[File:Amount dn.png|100px]]</br>A change in the amount of ''X''<sub>''i''</sub>, d''n''<sub>''i''</sub>, in an open system is due to both the internal formation in chemical transformations, d<sub>r</sub>''n''<sub>''i''</sub>, and the external transfer, d<sub>e</sub>''n''<sub>''i''</sub>, across the system boundaries. d''n''<sub>''i''</sub> is positive if ''X''<sub>''i''</sub> is formed as a product of the reaction within the system. d<sub>e</sub>''n''<sub>''i''</sub> is negative if ''X''<sub>''i''</sub> flows out of the system and appears as a product in the surroundings ([[Cohen 2008 IUPAC Green Book]]).[Cohen 2008 IUPAC Green Book]]).)
  • Amplitude  + (The '''amplitude''' of the [[absorbance spectrum]]The '''amplitude''' of the [[absorbance spectrum]] can be described in terms of the [[absorbance]] differences between the characteristic peaks (absorbance maxima) and troughs (absorbance minima) (see [[absorbance spectrum]]) for substances present in the sample.[[absorbance spectrum]]) for substances present in the sample.)
  • Background state  + (The '''background state''' Y (background rThe '''background state''' Y (background rate ''Y<sub>X</sub>'') is the non-activated or inhibited respiratory state at background rate, which is low in relation to the higher rate ''Z<sub>X</sub>'' in the [[reference state]] Z. The transition from the background state to the reference state is a step change. A [[metabolic control variable]] ''X'' (substrate, activator) is added to the background state to stimulate flux to the level of the reference state. Alternatively, the metabolic control variable ''X'' is an inhibitor, which is present in the background state Y, but absent in the reference state Z. The background state is the baseline of a single step in the definition of the [[flux control efficiency]]. In a sequence of step changes, the common [[baseline state]] is the state of lowest flux in relation to all steps, which can be used as a [[baseline correction]].[[baseline correction]].)