Electron Transport
Electron Transport Chain Complex Proteins
A complex of enzymes and PROTON PUMPS located on the inner membrane of the MITOCHONDRIA and in bacterial membranes. The protein complex provides energy in the form of an electrochemical gradient, which may be used by either MITOCHONDRIAL PROTON-TRANSLOCATING ATPASES or BACTERIAL PROTON-TRANSLOCATING ATPASES.
Microscopy, Electron
Microscopy using an electron beam, instead of light, to visualize the sample, thereby allowing much greater magnification. The interactions of ELECTRONS with specimens are used to provide information about the fine structure of that specimen. In TRANSMISSION ELECTRON MICROSCOPY the reactions of the electrons that are transmitted through the specimen are imaged. In SCANNING ELECTRON MICROSCOPY an electron beam falls at a non-normal angle on the specimen and the image is derived from the reactions occurring above the plane of the specimen.
Electrons
Stable elementary particles having the smallest known negative charge, present in all elements; also called negatrons. Positively charged electrons are called positrons. The numbers, energies and arrangement of electrons around atomic nuclei determine the chemical identities of elements. Beams of electrons are called CATHODE RAYS.
Biological Transport
Biological Transport, Active
Electron Transport Complex I
A flavoprotein and iron sulfur-containing oxidoreductase complex that catalyzes the conversion of UBIQUINONE to ubiquinol. In MITOCHONDRIA the complex also couples its reaction to the transport of PROTONS across the internal mitochondrial membrane. The NADH DEHYDROGENASE component of the complex can be isolated and is listed as EC 1.6.99.3.
Microscopy, Electron, Scanning
Microscopy in which the object is examined directly by an electron beam scanning the specimen point-by-point. The image is constructed by detecting the products of specimen interactions that are projected above the plane of the sample, such as backscattered electrons. Although SCANNING TRANSMISSION ELECTRON MICROSCOPY also scans the specimen point by point with the electron beam, the image is constructed by detecting the electrons, or their interaction products that are transmitted through the sample plane, so that is a form of TRANSMISSION ELECTRON MICROSCOPY.
Photosynthesis
The synthesis by organisms of organic chemical compounds, especially carbohydrates, from carbon dioxide using energy obtained from light rather than from the oxidation of chemical compounds. Photosynthesis comprises two separate processes: the light reactions and the dark reactions. In higher plants; GREEN ALGAE; and CYANOBACTERIA; NADPH and ATP formed by the light reactions drive the dark reactions which result in the fixation of carbon dioxide. (from Oxford Dictionary of Biochemistry and Molecular Biology, 2001)
Electron Transport Complex III
A multisubunit enzyme complex that contains CYTOCHROME B GROUP; CYTOCHROME C1; and iron-sulfur centers. It catalyzes the oxidation of ubiquinol to UBIQUINONE, and transfers the electrons to CYTOCHROME C. In MITOCHONDRIA the redox reaction is coupled to the transport of PROTONS across the inner mitochondrial membrane.
Electron Transport Complex IV
A multisubunit enzyme complex containing CYTOCHROME A GROUP; CYTOCHROME A3; two copper atoms; and 13 different protein subunits. It is the terminal oxidase complex of the RESPIRATORY CHAIN and collects electrons that are transferred from the reduced CYTOCHROME C GROUP and donates them to molecular OXYGEN, which is then reduced to water. The redox reaction is simultaneously coupled to the transport of PROTONS across the inner mitochondrial membrane.
Oxidation-Reduction
A chemical reaction in which an electron is transferred from one molecule to another. The electron-donating molecule is the reducing agent or reductant; the electron-accepting molecule is the oxidizing agent or oxidant. Reducing and oxidizing agents function as conjugate reductant-oxidant pairs or redox pairs (Lehninger, Principles of Biochemistry, 1982, p471).
Mitochondria
Semiautonomous, self-reproducing organelles that occur in the cytoplasm of all cells of most, but not all, eukaryotes. Each mitochondrion is surrounded by a double limiting membrane. The inner membrane is highly invaginated, and its projections are called cristae. Mitochondria are the sites of the reactions of oxidative phosphorylation, which result in the formation of ATP. They contain distinctive RIBOSOMES, transfer RNAs (RNA, TRANSFER); AMINO ACYL T RNA SYNTHETASES; and elongation and termination factors. Mitochondria depend upon genes within the nucleus of the cells in which they reside for many essential messenger RNAs (RNA, MESSENGER). Mitochondria are believed to have arisen from aerobic bacteria that established a symbiotic relationship with primitive protoeukaryotes. (King & Stansfield, A Dictionary of Genetics, 4th ed)
Antimycin A
Cytochromes
Hemeproteins whose characteristic mode of action involves transfer of reducing equivalents which are associated with a reversible change in oxidation state of the prosthetic group. Formally, this redox change involves a single-electron, reversible equilibrium between the Fe(II) and Fe(III) states of the central iron atom (From Enzyme Nomenclature, 1992, p539). The various cytochrome subclasses are organized by the type of HEME and by the wavelength range of their reduced alpha-absorption bands.
Electron Transport Complex II
Axonal Transport
Chlorophyll
Ubiquinone
Membrane Transport Proteins
Hydroxyquinolines
Oxidative Phosphorylation
Ion Transport
Oxidoreductases
The class of all enzymes catalyzing oxidoreduction reactions. The substrate that is oxidized is regarded as a hydrogen donor. The systematic name is based on donor:acceptor oxidoreductase. The recommended name will be dehydrogenase, wherever this is possible; as an alternative, reductase can be used. Oxidase is only used in cases where O2 is the acceptor. (Enzyme Nomenclature, 1992, p9)
Protein Transport
Oxygen Consumption
Uncoupling Agents
Microscopy, Electron, Transmission
Plastoquinone
Electron Spin Resonance Spectroscopy
A technique applicable to the wide variety of substances which exhibit paramagnetism because of the magnetic moments of unpaired electrons. The spectra are useful for detection and identification, for determination of electron structure, for study of interactions between molecules, and for measurement of nuclear spins and moments. (From McGraw-Hill Encyclopedia of Science and Technology, 7th edition) Electron nuclear double resonance (ENDOR) spectroscopy is a variant of the technique which can give enhanced resolution. Electron spin resonance analysis can now be used in vivo, including imaging applications such as MAGNETIC RESONANCE IMAGING.
Cyanides
NADH Dehydrogenase
A flavoprotein and iron sulfur-containing oxidoreductase that catalyzes the oxidation of NADH to NAD. In eukaryotes the enzyme can be found as a component of mitochondrial electron transport complex I. Under experimental conditions the enzyme can use CYTOCHROME C GROUP as the reducing cofactor. The enzyme was formerly listed as EC 1.6.2.1.
Photosystem II Protein Complex
Cell Membrane
Chloroplasts
Plant cell inclusion bodies that contain the photosynthetic pigment CHLOROPHYLL, which is associated with the membrane of THYLAKOIDS. Chloroplasts occur in cells of leaves and young stems of plants. They are also found in some forms of PHYTOPLANKTON such as HAPTOPHYTA; DINOFLAGELLATES; DIATOMS; and CRYPTOPHYTA.
Succinates
Succinate Dehydrogenase
Oxygen
Photosystem I Protein Complex
Thylakoids
Membranous cisternae of the CHLOROPLAST containing photosynthetic pigments, reaction centers, and the electron-transport chain. Each thylakoid consists of a flattened sac of membrane enclosing a narrow intra-thylakoid space (Lackie and Dow, Dictionary of Cell Biology, 2nd ed). Individual thylakoids are interconnected and tend to stack to form aggregates called grana. They are found in cyanobacteria and all plants.
Cytochrome b6f Complex
A protein complex that includes CYTOCHROME B6 and CYTOCHROME F. It is found in the THYLAKOID MEMBRANE and plays an important role in process of PHOTOSYNTHESIS by transferring electrons from PLASTOQUINONE to PLASTOCYANIN or CYTOCHROME C6. The transfer of electrons is coupled to the transport of PROTONS across the membrane.
Cell Respiration
NAD
A coenzyme composed of ribosylnicotinamide 5'-diphosphate coupled to adenosine 5'-phosphate by pyrophosphate linkage. It is found widely in nature and is involved in numerous enzymatic reactions in which it serves as an electron carrier by being alternately oxidized (NAD+) and reduced (NADH). (Dorland, 27th ed)
Photosynthetic Reaction Center Complex Proteins
Protein complexes that take part in the process of PHOTOSYNTHESIS. They are located within the THYLAKOID MEMBRANES of plant CHLOROPLASTS and a variety of structures in more primitive organisms. There are two major complexes involved in the photosynthetic process called PHOTOSYSTEM I and PHOTOSYSTEM II.
Molecular Sequence Data
Descriptions of specific amino acid, carbohydrate, or nucleotide sequences which have appeared in the published literature and/or are deposited in and maintained by databanks such as GENBANK, European Molecular Biology Laboratory (EMBL), National Biomedical Research Foundation (NBRF), or other sequence repositories.
Mutation
Adenosine Triphosphate
Reactive Oxygen Species
Molecules or ions formed by the incomplete one-electron reduction of oxygen. These reactive oxygen intermediates include SINGLET OXYGEN; SUPEROXIDES; PEROXIDES; HYDROXYL RADICAL; and HYPOCHLOROUS ACID. They contribute to the microbicidal activity of PHAGOCYTES, regulation of signal transduction and gene expression, and the oxidative damage to NUCLEIC ACIDS; PROTEINS; and LIPIDS.
Amobarbital
Models, Biological
Cytochrome c Group
Hydrogen-Ion Concentration
NADH, NADPH Oxidoreductases
A group of oxidoreductases that act on NADH or NADPH. In general, enzymes using NADH or NADPH to reduce a substrate are classified according to the reverse reaction, in which NAD+ or NADP+ is formally regarded as an acceptor. This subclass includes only those enzymes in which some other redox carrier is the acceptor. (Enzyme Nomenclature, 1992, p100) EC 1.6.
Monosaccharide Transport Proteins
Amino Acid Sequence
Ferredoxins
Cytochrome b Group
Potassium Cyanide
Succinic Acid
A water-soluble, colorless crystal with an acid taste that is used as a chemical intermediate, in medicine, the manufacture of lacquers, and to make perfume esters. It is also used in foods as a sequestrant, buffer, and a neutralizing agent. (Hawley's Condensed Chemical Dictionary, 12th ed, p1099; McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed, p1851)
Plant Leaves
Carrier Proteins
Spectrophotometry
Dibromothymoquinone
Hydrogen
The first chemical element in the periodic table. It has the atomic symbol H, atomic number 1, and atomic weight [1.00784; 1.00811]. It exists, under normal conditions, as a colorless, odorless, tasteless, diatomic gas. Hydrogen ions are PROTONS. Besides the common H1 isotope, hydrogen exists as the stable isotope DEUTERIUM and the unstable, radioactive isotope TRITIUM.
Plastocyanin
Protons
Photophosphorylation
Wolinella
Anaerobiosis
Cyanobacteria
A phylum of oxygenic photosynthetic bacteria comprised of unicellular to multicellular bacteria possessing CHLOROPHYLL a and carrying out oxygenic PHOTOSYNTHESIS. Cyanobacteria are the only known organisms capable of fixing both CARBON DIOXIDE (in the presence of light) and NITROGEN. Cell morphology can include nitrogen-fixing heterocysts and/or resting cells called akinetes. Formerly called blue-green algae, cyanobacteria were traditionally treated as ALGAE.
Mitochondria, Liver
Mitochondria in hepatocytes. As in all mitochondria, there are an outer membrane and an inner membrane, together creating two separate mitochondrial compartments: the internal matrix space and a much narrower intermembrane space. In the liver mitochondrion, an estimated 67% of the total mitochondrial proteins is located in the matrix. (From Alberts et al., Molecular Biology of the Cell, 2d ed, p343-4)
Escherichia coli
A species of gram-negative, facultatively anaerobic, rod-shaped bacteria (GRAM-NEGATIVE FACULTATIVELY ANAEROBIC RODS) commonly found in the lower part of the intestine of warm-blooded animals. It is usually nonpathogenic, but some strains are known to produce DIARRHEA and pyogenic infections. Pathogenic strains (virotypes) are classified by their specific pathogenic mechanisms such as toxins (ENTEROTOXIGENIC ESCHERICHIA COLI), etc.
Membrane Proteins
Glucose
Sodium
NADP
Nicotinamide adenine dinucleotide phosphate. A coenzyme composed of ribosylnicotinamide 5'-phosphate (NMN) coupled by pyrophosphate linkage to the 5'-phosphate adenosine 2',5'-bisphosphate. It serves as an electron carrier in a number of reactions, being alternately oxidized (NADP+) and reduced (NADPH). (Dorland, 27th ed)
Transport Vesicles
Plants
Multicellular, eukaryotic life forms of kingdom Plantae (sensu lato), comprising the VIRIDIPLANTAE; RHODOPHYTA; and GLAUCOPHYTA; all of which acquired chloroplasts by direct endosymbiosis of CYANOBACTERIA. They are characterized by a mainly photosynthetic mode of nutrition; essentially unlimited growth at localized regions of cell divisions (MERISTEMS); cellulose within cells providing rigidity; the absence of organs of locomotion; absence of nervous and sensory systems; and an alternation of haploid and diploid generations.
Dicumarol
Cytochromes f
Shewanella
Iron-Sulfur Proteins
Light-Harvesting Protein Complexes
Carbonyl Cyanide p-Trifluoromethoxyphenylhydrazone
Intracellular Membranes
Synechocystis
Temperature
Fluorescence
Mitochondria, Muscle
Plant Proteins
Carbonyl Cyanide m-Chlorophenyl Hydrazone
Energy Metabolism
Ferredoxin-NADP Reductase
Carbon Dioxide
Quinones
Quinone Reductases
NAD(P)H:(quinone acceptor) oxidoreductases. A family that includes three enzymes which are distinguished by their sensitivity to various inhibitors. EC 1.6.99.2 (NAD(P)H DEHYDROGENASE (QUINONE);) is a flavoprotein which reduces various quinones in the presence of NADH or NADPH and is inhibited by dicoumarol. EC 1.6.99.5 (NADH dehydrogenase (quinone)) requires NADH, is inhibited by AMP and 2,4-dinitrophenol but not by dicoumarol or folic acid derivatives. EC 1.6.99.6 (NADPH dehydrogenase (quinone)) requires NADPH and is inhibited by dicoumarol and folic acid derivatives but not by 2,4-dinitrophenol.
Mitochondrial Proteins
Proton-Motive Force
Energy that is generated by the transfer of protons or electrons across an energy-transducing membrane and that can be used for chemical, osmotic, or mechanical work. Proton-motive force can be generated by a variety of phenomena including the operation of an electron transport chain, illumination of a PURPLE MEMBRANE, and the hydrolysis of ATP by a proton ATPase. (From Singleton & Sainsbury, Dictionary of Microbiology and Molecular Biology, 2d ed, p171)
Hydrogen Peroxide
Golgi Apparatus
A stack of flattened vesicles that functions in posttranslational processing and sorting of proteins, receiving them from the rough ENDOPLASMIC RETICULUM and directing them to secretory vesicles, LYSOSOMES, or the CELL MEMBRANE. The movement of proteins takes place by transfer vesicles that bud off from the rough endoplasmic reticulum or Golgi apparatus and fuse with the Golgi, lysosomes or cell membrane. (From Glick, Glossary of Biochemistry and Molecular Biology, 1990)
Spinacia oleracea
Oligomycins
A closely related group of toxic substances elaborated by various strains of Streptomyces. They are 26-membered macrolides with lactone moieties and double bonds and inhibit various ATPases, causing uncoupling of phosphorylation from mitochondrial respiration. Used as tools in cytochemistry. Some specific oligomycins are RUTAMYCIN, peliomycin, and botrycidin (formerly venturicidin X).
Cells, Cultured
Iron
Models, Molecular
Vitamin K
A lipid cofactor that is required for normal blood clotting. Several forms of vitamin K have been identified: VITAMIN K 1 (phytomenadione) derived from plants, VITAMIN K 2 (menaquinone) from bacteria, and synthetic naphthoquinone provitamins, VITAMIN K 3 (menadione). Vitamin K 3 provitamins, after being alkylated in vivo, exhibit the antifibrinolytic activity of vitamin K. Green leafy vegetables, liver, cheese, butter, and egg yolk are good sources of vitamin K.
Oxidative Stress
Microscopy, Electron, Scanning Transmission
A type of TRANSMISSION ELECTRON MICROSCOPY in which the object is examined directly by an extremely narrow electron beam scanning the specimen point-by-point and using the reactions of the electrons that are transmitted through the specimen to create the image. It should not be confused with SCANNING ELECTRON MICROSCOPY.
Base Sequence
Atovaquone
Anion Transport Proteins
Superoxides
Highly reactive compounds produced when oxygen is reduced by a single electron. In biological systems, they may be generated during the normal catalytic function of a number of enzymes and during the oxidation of hemoglobin to METHEMOGLOBIN. In living organisms, SUPEROXIDE DISMUTASE protects the cell from the deleterious effects of superoxides.
Onium Compounds
Cation Transport Proteins
Geobacter
Diffusion
Valinomycin
A cyclododecadepsipeptide ionophore antibiotic produced by Streptomyces fulvissimus and related to the enniatins. It is composed of 3 moles each of L-valine, D-alpha-hydroxyisovaleric acid, D-valine, and L-lactic acid linked alternately to form a 36-membered ring. (From Merck Index, 11th ed) Valinomycin is a potassium selective ionophore and is commonly used as a tool in biochemical studies.
Multienzyme Complexes
Adenosine Triphosphatases
Water
Cattle
Bacterial Chromatophores
Vesicular Transport Proteins
A broad category of proteins involved in the formation, transport and dissolution of TRANSPORT VESICLES. They play a role in the intracellular transport of molecules contained within membrane vesicles. Vesicular transport proteins are distinguished from MEMBRANE TRANSPORT PROTEINS, which move molecules across membranes, by the mode in which the molecules are transported.
Heme
Amino Acids
Dicyclohexylcarbodiimide
Binding Sites
Polarography
An electrochemical technique for measuring the current that flows in solution as a function of an applied voltage. The observed polarographic wave, resulting from the electrochemical response, depends on the way voltage is applied (linear sweep or differential pulse) and the type of electrode used. Usually a mercury drop electrode is used.
Electron Probe Microanalysis
Identification and measurement of ELEMENTS and their location based on the fact that X-RAYS emitted by an element excited by an electron beam have a wavelength characteristic of that element and an intensity related to its concentration. It is performed with an electron microscope fitted with an x-ray spectrometer, in scanning or transmission mode.
Protein Binding
Membrane Potential, Mitochondrial
Arabidopsis
Membrane Potentials
The voltage differences across a membrane. For cellular membranes they are computed by subtracting the voltage measured outside the membrane from the voltage measured inside the membrane. They result from differences of inside versus outside concentration of potassium, sodium, chloride, and other ions across cells' or ORGANELLES membranes. For excitable cells, the resting membrane potentials range between -30 and -100 millivolts. Physical, chemical, or electrical stimuli can make a membrane potential more negative (hyperpolarization), or less negative (depolarization).
Rabbits
NAD(P)H Dehydrogenase (Quinone)
Ribulose-Bisphosphate Carboxylase
A carboxy-lyase that plays a key role in photosynthetic carbon assimilation in the CALVIN-BENSON CYCLE by catalyzing the formation of 3-phosphoglycerate from ribulose 1,5-biphosphate and CARBON DIOXIDE. It can also utilize OXYGEN as a substrate to catalyze the synthesis of 2-phosphoglycolate and 3-phosphoglycerate in a process referred to as photorespiration.
Saccharomyces cerevisiae
Electrochemistry
Protein Conformation
The characteristic 3-dimensional shape of a protein, including the secondary, supersecondary (motifs), tertiary (domains) and quaternary structure of the peptide chain. PROTEIN STRUCTURE, QUATERNARY describes the conformation assumed by multimeric proteins (aggregates of more than one polypeptide chain).
Culture Media
Any liquid or solid preparation made specifically for the growth, storage, or transport of microorganisms or other types of cells. The variety of media that exist allow for the culturing of specific microorganisms and cell types, such as differential media, selective media, test media, and defined media. Solid media consist of liquid media that have been solidified with an agent such as AGAR or GELATIN.
Rhodobacter sphaeroides
Amino Acid Transport Systems
Chlamydomonas reinhardtii
Tobacco
Cytochromes c
Potassium
An element in the alkali group of metals with an atomic symbol K, atomic number 19, and atomic weight 39.10. It is the chief cation in the intracellular fluid of muscle and other cells. Potassium ion is a strong electrolyte that plays a significant role in the regulation of fluid volume and maintenance of the WATER-ELECTROLYTE BALANCE.
Cytoplasm
Sequence Homology, Amino Acid
Tilia
Ascorbic Acid
A six carbon compound related to glucose. It is found naturally in citrus fruits and many vegetables. Ascorbic acid is an essential nutrient in human diets, and necessary to maintain connective tissue and bone. Its biologically active form, vitamin C, functions as a reducing agent and coenzyme in several metabolic pathways. Vitamin C is considered an antioxidant.
Calcium
A basic element found in nearly all organized tissues. It is a member of the alkaline earth family of metals with the atomic symbol Ca, atomic number 20, and atomic weight 40. Calcium is the most abundant mineral in the body and combines with phosphorus to form calcium phosphate in the bones and teeth. It is essential for the normal functioning of nerves and muscles and plays a role in blood coagulation (as factor IV) and in many enzymatic processes.
Flavins
Anions
Submitochondrial Particles
Cardiolipins
Acidic phospholipids composed of two molecules of phosphatidic acid covalently linked to a molecule of glycerol. They occur primarily in mitochondrial inner membranes and in bacterial plasma membranes. They are the main antigenic components of the Wassermann-type antigen that is used in nontreponemal SYPHILIS SERODIAGNOSIS.
DNA, Mitochondrial
Methanosarcina
A genus of anaerobic, irregular spheroid-shaped METHANOSARCINALES whose organisms are nonmotile. Endospores are not formed. These archaea derive energy via formation of methane from acetate, methanol, mono-, di-, and trimethylamine, and possibly, carbon monoxide. Organisms are isolated from freshwater and marine environments.
Methacrylates
Nitrates
ATP-Binding Cassette Transporters
Flavin-Adenine Dinucleotide
Azotobacter
Membranes
Bioelectric Energy Sources
Free Radicals
Highly reactive molecules with an unsatisfied electron valence pair. Free radicals are produced in both normal and pathological processes. They are proven or suspected agents of tissue damage in a wide variety of circumstances including radiation, damage from environment chemicals, and aging. Natural and pharmacological prevention of free radical damage is being actively investigated.
Succinate Cytochrome c Oxidoreductase
Hydrogenase
Cytochromes c2
Tetramethylphenylenediamine
Cell Membrane Permeability
Citric Acid Cycle
Fluorometry
Spectrum Analysis
Symporters
Long-range oxidative damage to DNA: effects of distance and sequence. (1/5429)
INTRODUCTION: Oxidative damage to DNA in vivo can lead to mutations and cancer. DNA damage and repair studies have not yet revealed whether permanent oxidative lesions are generated by charges migrating over long distances. Both photoexcited *Rh(III) and ground-state Ru(III) intercalators were previously shown to oxidize guanine bases from a remote site in oligonucleotide duplexes by DNA-mediated electron transfer. Here we examine much longer charge-transport distances and explore the sensitivity of the reaction to intervening sequences. RESULTS: Oxidative damage was examined in a series of DNA duplexes containing a pendant intercalating photooxidant. These studies revealed a shallow dependence on distance and no dependence on the phasing orientation of the oxidant relative to the site of damage, 5'-GG-3'. The intervening DNA sequence has a significant effect on the yield of guanine oxidation, however. Oxidation through multiple 5'-TA-3' steps is substantially diminished compared to through other base steps. We observed intraduplex guanine oxidation by tethered *Rh(III) and Ru(III) over a distance of 200 A. The distribution of oxidized guanine varied as a function of temperature between 5 and 35 degrees C, with an increase in the proportion of long-range damage (> 100 A) occurring at higher temperatures. CONCLUSIONS: Guanines are oxidized as a result of DNA-mediated charge transport over significant distances (e.g. 200 A). Although long-range charge transfer is dependent on distance, it appears to be modulated by intervening sequence and sequence-dependent dynamics. These discoveries hold important implications with respect to DNA damage in vivo. (+info)Internal electron transfer between hemes and Cu(II) bound at cysteine beta93 promotes methemoglobin reduction by carbon monoxide. (2/5429)
Previous studies showed that CO/H2O oxidation provides electrons to drive the reduction of oxidized hemoglobin (metHb). We report here that Cu(II) addition accelerates the rate of metHb beta chain reduction by CO by a factor of about 1000. A mechanism whereby electron transfer occurs via an internal pathway coupling CO/H2O oxidation to Fe(III) and Cu(II) reduction is suggested by the observation that the copper-induced rate enhancement is inhibited by blocking Cys-beta93 with N-ethylmaleimide. Furthermore, this internal electron-transfer pathway is more readily established at low Cu(II) concentrations in Hb Deer Lodge (beta2His --> Arg) and other species lacking His-beta2 than in Hb A0. This difference is consistent with preferential binding of Cu(II) in Hb A0 to a high affinity site involving His-beta2, which is ineffective in promoting electron exchange between Cu(II) and the beta heme iron. Effective electron transfer is thus affected by Hb type but is not governed by the R left arrow over right arrow T conformational equilibrium. The beta hemes in Cu(II)-metHb are reduced under CO at rates close to those observed for cytochrome c oxidase, where heme and copper are present together in the oxygen-binding site and where internal electron transfer also occurs. (+info)Role of a novel photosystem II-associated carbonic anhydrase in photosynthetic carbon assimilation in Chlamydomonas reinhardtii. (3/5429)
Intracellular carbonic anhydrases (CA) in aquatic photosynthetic organisms are involved in the CO2-concentrating mechanism (CCM), which helps to overcome CO2 limitation in the environment. In the green alga Chlamydomonas reinhardtii, this CCM is initiated and maintained by the pH gradient created across the chloroplast thylakoid membranes by photosystem (PS) II-mediated electron transport. We show here that photosynthesis is stimulated by a novel, intracellular alpha-CA bound to the chloroplast thylakoids. It is associated with PSII on the lumenal side of the thylakoid membranes. We demonstrate that PSII in association with this lumenal CA operates to provide an ample flux of CO2 for carboxylation. (+info)Pathways of electron transfer in Escherichia coli DNA photolyase: Trp306 to FADH. (4/5429)
We describe the results of a series of theoretical calculations of electron transfer pathways between Trp306 and *FADH. in the Escherichia coli DNA photolyase molecule, using the method of interatomic tunneling currents. It is found that there are two conformationally orthogonal tryptophans, Trp359 and Trp382, between donor and acceptor that play a crucial role in the pathways of the electron transfer process. The pathways depend vitally on the aromaticity of tryptophans and the flavin molecule. The results of this calculation suggest that the major pathway of the electron transfer is due to a set of overlapping orthogonal pi-rings, which starts from the donor Trp306, runs through Trp359 and Trp382, and finally reaches the flavin group of the acceptor complex, FADH. (+info)Nitrate-dependent regulation of acetate biosynthesis and nitrate respiration by Clostridium thermoaceticum. (5/5429)
Nitrate has been shown to shunt the electron flow in Clostridium thermoaceticum from CO2 to nitrate, but it did not influence the levels of enzymes involved in the Wood-Ljungdahl pathway (J. M. Frostl, C. Seifritz, and H. L. Drake, J. Bacteriol. 178:4597-4603, 1996). Here we show that under some growth conditions, nitrate does in fact repress proteins involved in the Wood-Ljungdahl pathway. The CO oxidation activity in crude extracts of nitrate (30 mM)-supplemented cultures was fivefold less than that of nitrate-free cultures, while the H2 oxidation activity was six- to sevenfold lower. The decrease in CO oxidation activity paralleled a decrease in CO dehydrogenase (CODH) protein level, as confirmed by Western blot analysis. Protein levels of CODH in nitrate-supplemented cultures were 50% lower than those in nitrate-free cultures. Western blots analyses showed that nitrate also decreased the levels of the corrinoid iron-sulfur protein (60%) and methyltransferase (70%). Surprisingly, the decrease in activity and protein levels upon nitrate supplementation was observed only when cultures were continuously sparged. Northern blot analysis indicates that the regulation of the proteins involved in the Wood-Ljungdahl pathway by nitrate is at the transcriptional level. At least a 10-fold decrease in levels of cytochrome b was observed with nitrate supplementation whether the cultures were sparged or stoppered. We also detected nitrate-inducible nitrate reductase activity (2 to 39 nmol min-1 mg-1) in crude extracts of C. thermoaceticum. Our results indicate that nitrate coordinately represses genes encoding enzymes and electron transport proteins in the Wood-Ljungdahl pathway and activates transcription of nitrate respiratory proteins. CO2 also appears to induce expression of the Wood-Ljungdahl pathway genes and repress nitrate reductase activity. (+info)Structure of a cytochrome P450-redox partner electron-transfer complex. (6/5429)
The crystal structure of the complex between the heme- and FMN-binding domains of bacterial cytochrome P450BM-3, a prototype for the complex between eukaryotic microsomal P450s and P450 reductase, has been determined at 2.03 A resolution. The flavodoxin-like flavin domain is positioned at the proximal face of the heme domain with the FMN 4.0 and 18.4 A from the peptide that precedes the heme-binding loop and the heme iron, respectively. The heme-binding peptide represents the most efficient and coupled through-bond electron pathway to the heme iron. Substantial differences between the FMN-binding domains of P450BM-3 and microsomal P450 reductase, observed around the flavin-binding sites, are responsible for different redox properties of the FMN, which, in turn, control electron flow to the P450. (+info)Multiple pathways for ultrafast transduction of light energy in the photosynthetic reaction center of Rhodobacter sphaeroides. (7/5429)
A pathway of electron transfer is described that operates in the wild-type reaction center (RC) of the photosynthetic bacterium Rhodobacter sphaeroides. The pathway does not involve the excited state of the special pair dimer of bacteriochlorophylls (P*), but instead is driven by the excited state of the monomeric bacteriochlorophyll (BA*) present in the active branch of pigments along which electron transfer occurs. Pump-probe experiments were performed at 77 K on membrane-bound RCs by using different excitation wavelengths, to investigate the formation of the charge separated state P+HA-. In experiments in which P or BA was selectively excited at 880 nm or 796 nm, respectively, the formation of P+HA- was associated with similar time constants of 1.5 ps and 1. 7 ps. However, the spectral changes associated with the two time constants are very different. Global analysis of the transient spectra shows that a mixture of P+BA- and P* is formed in parallel from BA* on a subpicosecond time scale. In contrast, excitation of the inactive branch monomeric bacteriochlorophyll (BB) and the high exciton component of P (P+) resulted in electron transfer only after relaxation to P*. The multiple pathways for primary electron transfer in the bacterial RC are discussed with regard to the mechanism of charge separation in the RC of photosystem II from higher plants. (+info)Purified fusion enzyme between rat cytochrome P4501A1 and yeast NADPH-cytochrome P450 oxidoreductase. (8/5429)
A genetically engineered fusion enzyme between rat P4501A1 and yeast P450 reductase in the microsomal fraction of the recombinant yeast AH22/pAFCR1 was purified. The purified enzyme showed a typical CO-difference spectrum of P4501A1 and a single band with an apparent molecular weight of 125,000 on sodium dodecyl sulfate polyacrylamide gel electrophoresis. This agreed with the molecular weight of 131,202 calculated from the amino acid sequence. The purified enzyme showed both 7-ethoxycoumarin o-deethylase activity and horse heart cytochrome c reductase activity in the presence of NADPH. The 7-ethoxycoumarin o-deethylase activity depended on the species of lipid used for the reconstitution of the purified fusion enzyme although the purified enzyme showed the activity without reconstitution. The purified fusion enzyme had the Km value of 26 microM for 7-ethoxycoumarin and the maximal turnover rate of 29 mol product/min/mol enzyme at 30 degrees C. (+info)
Tight product binding is the key for efficient electron transfer from D-lactate dehydrogenase 2 to the electron transferring...
Photoinhibition and Light-Induced Cyclic Electron Transport in ndhB- and psaE- Mutants of Synechocystis sp. PCC 6803 : Plant...
ReP USP - Detalhe do registro: Molecular shift register memory based on electron transfer
Essays: Research Proposals: Electron Transport Chain and Energy Production
Fast electron transfer through a single molecule natively structured redox protein - Danish National Research Database-Den...
Electron Transfer through U-Shaped Donor-Bridge-Acceptor Molecules and Fluorescence Quenching of Conjugated Polyelectrolyte -...
Coexistence of two thermally induced intramolecular electron transfer processes in a series of metal complexes [M(Cat-N-BQ)(Cat...
Hydrogen-bond effects on Proton-Coupled Electron Transfer from Phenols
Mutagenetix > Incidental...
Energetic mechanism of cytochrome c-cytochrome c oxidase electron transfer complex formation under turnover conditions revealed...
Electron transport chain | LAMP
Tunneling time for electron transfer reactions<...
Numerical solution of solvent reorganization energy and its application in electron transfer reaction<...
Oxygen Isotope Effects on Electron Transfer to O
2
Probed Using Chemically Modified Flavins Bound to Glucose Oxidase
Intramolecular Electron Transfer from Tryptophan to Guanosyl Radicals in a Linked System as a Model of DNA Repair<...
A Helical Peptide can Mediate Electron over 120 Å by Hopping Mechanism
Electron Transfer in Biology and the Solid State: Inorganic Compounds With Unusual Properties {Volume 226 of the Advances in...
science24.com - Electron Transfer in Complex Two-cofactor-containing Enzymes at Alkanethiol-modified Gold Electrodes
Role of Inertial Effects in Electron Transfer Kinetics - Acta Physica Polonica A - Volume 89, Issue 5-6 (1996) - PSJD - Yadda
Genetic and epigenetic factors are associated with expression of respiratory chain component NDUFB6 in human skeletal muscle. ...
Glycolysis | Boundless Microbiology
Recent insights into the double role of hydrogen peroxide in plants | Frontiers Research Topic
Biological Electron Microscopy: Theory, Techniques, and Troubleshooting 1st Edition | Rent 9780306442773 | 0306442779
Aerobic Respiration: Part-2 : Plantlet
Biological Electron Microscopy: Theory, Techniques, and Troubleshooting | Download online ebook
Electron Transport - Progress - GO Wiki
ASMscience | The Aerobic and Anaerobic Respiratory Chain of |span class=jp-italic|Escherichia coli|/span| and |span class=jp...
Contrasting photoinduced electron-transfer properties of two closely related, rigidly linked porphyrin-quinone dyads<...
Electron Transport System - final electron acceptor is an oxygen atom In their energy-depleted condition the electrons unite...
Conserved role of proton gradient regulation 5 in the regulation of PSI cyclic electron transport
Visible light induced electron transfer processes in amine deprotectio by Haihong Jin
Mechanistic insights about electrochemical proton-coupled electron transfer derived from a vibrational probe - Hammes-Schiffer...
Many-body effects in the spin-polarized electron transport through graphene nanoislands (Journal Article) | SciTech Connect
Molecular wire-nanotube interfacial effects on electron transport - Publikationsserver der Universität Regensburg
Where does the electron transport chain take place? | Reference.com
All Faculty and Research Staff Publications | UW-Madison Department of Chemistry
Publications | Smith Research Group
Publications | Smith Research Group
What is Electron Transport System? Definition, Components & Location - Biology Reader
Energy and electron transfer in a poly(fluorene-alt-phenylene) bearing perylenediimides as pendant electron acceptor groups<...
Mitochondrial Electron Transport Chain Inhibitors
Electron Transport on Helium Films in Confined Geometry
Highly (001)-textured p-type WSe 2 Thin Films as Efficient Large-Area Photocathodes for Solar Hydrogen Evolution | Scientific...
Sandwalk: April 2016
Electron Transport Chain - Biology Ease
Evaluation of Acetate Thresholds Under Various Terminal Electron-Accepting Conditions: Application to Bioremediation Monitoring
VCAC: Cellular Processes: Electron Transport Chain: Advanced Look: ATP Synthase
Electron Transport Chain, Phosphorylation
cytochromep450 - Projects - Amsterdam Institute of Molecular and Life Sciences (AIMMS), Vrije Universiteit Amsterdam
Ferroelastic modulation and the Bloch formalism | Science Advances
Proton pump
Electron transport driven proton pumps[edit]. Electron Transport Complex I[edit]. Main article: NADH dehydrogenase (ubiquinone) ... This proton pump is driven by electron transport and catalyzes the transfer of electrons from plastoquinol to plastocyanin. The ... Electron Transport Complex IV[edit]. Main article: Cytochrome c oxidase. Complex IV (EC 1.9.3.1) (also referred to as ... Electron Transport Complex III[edit]. Main article: Coenzyme Q - cytochrome c reductase ...
Crista
FADH2 is also oxidized into H+ ions, electrons, and FAD. As those electrons travel farther through the electron transport chain ... Main article: Electron transport chain. NADH is oxidized into NAD+, H+ ions, and electrons by an enzyme. ... The electrons from each NADH molecule can form a total of 3 ATPs from ADPs and phosphate groups through the electron transport ... The electron transport chain requires a varying supply of electrons in order to properly function and generate ATP. However, ...
Human mitochondrial genetics
Electron transport chain, and humanin[edit]. It was originally incorrectly believed that the mitochondrial genome contained ... all of them encoding proteins of the electron transport chain. However, in 2001, a 14th biologically active protein called ... to damage from free oxygen radicals from mistakes that occur during the production of ATP through the electron transport chain ...
Transmembrane protein
See electron transport chain.. *Cytochrome c oxidases from bacteria and mitochondria. Electrochemical potential-driven ... Membrane protein structures can be determined by X-ray crystallography, electron microscopy or NMR spectroscopy.[7] The most ... FadL outer membrane protein transport family, including Fatty acid transporter FadL (n=14,S=14) ... Many transmembrane proteins function as gateways to permit the transport of specific substances across the membrane. They ...
Green sulfur bacteria
... electrons are ejected and transferred through electron transport chains (ETCs). Some electrons form Fe-S proteins in electron ... The Reaction Center Photochemistry and Electron Transport". Photosynthesis. Advances in Photosynthesis and Respiration. 10. pp ... Cytochrome c-551 then passes the electrons down the electron chain. P840 is returned to its reduced state by the oxidation of ... Green sulfur bacteria use sulfide ions, hydrogen or ferrous iron as electron donors and the process is mediated by the Type I ...
Cellular respiration - Simple English Wikipedia, the free encyclopedia
Electron transport chain (ETC)[change , change source]. Main article: Electron transport chain ... It has four stages known as glycolysis, Link reaction, the Krebs cycle, and the electron transport chain. This produces ATP ... and about 34 from the electron transport chain).[1] However, the process actually makes less energy (ATP) because of losses ... are pumped inside the mitochondria using energy that electrons release. Eventually, the electrons powering the pumping of ...
Adenosine diphosphate
... that aid in the electron transport chain's ability to produce a proton gradient across the inner mitochondrial membrane.[13] ... "Electron Transport Chain (Overview)" (PDF). CSUN.edu. Retrieved 4 April 2013.. ... It is this energy coupling and phosphorylation of ADP to ATP that gives the electron transport chain the name oxidative ... During the initial phases of glycolysis and the TCA cycle, cofactors such as NAD+ donate and accept electrons[12] ...
Electrochemical gradient
The total equation for the electron transport chain is: N. A. D. H. +. 11. H. +. (. m. a. t. r. i. x. ). +. 1. /. 2. O. 2. ⟶. N ... In the electron transport chain, Complex I (CI) catalyzes the reduction of ubiquinone (UQ) to ubiquinol (UQH2) by the transfer ... Similar to the electron transport chain, the light-dependent reactions of photosynthesis pump protons into the thylakoid lumen ... The process that occurs is similar to the Q-cycle in Complex III of the electron transport chain. In the first reaction, PQH2 ...
Oxygenase
Mason HS, Fowlks WK, Peterson E (1955). "Oxygen transfer and electron transport by the phenolase complex". J. Am. Chem. Soc. 77 ...
Lanosterol 14 alpha-demethylase
Hannemann F, Bichet A, Ewen KM, Bernhardt R (March 2007). "Cytochrome P450 systems--biological variations of electron transport ...
Chemiosmosis
These molecules pass electrons to an electron transport chain, which uses the energy released to create a proton gradient ... These electrons travel down an electron transport chain, causing protons to be actively pumped across the thylakoid membrane ... The energy from the electron movement through electron transport chains cross through ATP synthase which allows the proton to ... The carriers pass electrons to the electron transport chain (ETC) in the inner mitochondrial membrane, which in turn pass them ...
Biohydrogen
Photosynthesis in cyanobacteria and green algae splits water into hydrogen ions and electrons. The electrons are transported ... In Chlamydomonas reinhardtii Photosystem II produces in direct conversion of sunlight 80% of the electrons that end up in the ... Competitive drainage of electrons by oxygen in algal hydrogen production.. *Economics must reach competitive price to other ...
Bosonization
doi:10.1007/0-387-21717-7_4. ISBN 978-0-387-00895-0. Sohn, Lydia (ed.) (1997). Mesoscopic electron transport. Springer. pp. ... Daniel C. Mattis [de] and Elliot H. Lieb, proved in 1965, that electrons could be modeled as bosonic interactions. The response ... The Luttinger liquid model, proposed by Tomonaga and reformulated by J.M. Luttinger, describes electrons in one-dimensional ... Theoretical Methods for Strongly Correlated Electrons. CRM Series in Mathematical Physics. Springer. pp. 139-186. arXiv:cond- ...
David DiVincenzo
Mesoscopic Electron Transport. arXiv:cond-mat/9612126. "Proposed modular quantum computer architecture offers scalability to ... which would use electron spins in quantum dots as qubits. In 1996, during his research at IBM, he published a paper "Topics in ...
Purple bacteria
... use cyclic electron transport driven by a series of redox reactions.[5] Light-harvesting complexes surrounding ... Electron donors for anabolism[edit]. Purple bacteria also transfer electrons from external electron donors directly to ... Alastair G. McEwan (March 1994). "Photosynthetic electron transport and anaerobic metabolism in purple non-sulfur phototrophic ... "Modeling the electron transport chain of purple non-sulfur bacteria". Molecular Systems Biology. 4: 156. doi:10.1038/msb4100191 ...
Coenzyme Q10
... is central to its role in the electron transport chain due to the iron-sulfur clusters that can only accept one electron at a ... It is a component of the electron transport chain and participates in aerobic cellular respiration, which generates energy in ... "4 Coenzyme Q oxidation reduction reactions in mitochondrial electron transport". In Kagan, V. E.; Quinn, P. J. Coenzyme Q: ... The capacity of this molecule to act as a two-electron carrier (moving between the quinone and quinol form) and a one-electron ...
Remineralisation
For the microbial perspective please reference the electron transport chain. Remineralization in sediments[edit]. Reactions[ ... Electron acceptor cascade[edit]. Sketch of major electron acceptors in marine sediment porewater based on idealized relative ... Boudreau, Bernard (2001). The Benthic Boundary Layer: Transport Processes and Biogeochemistry. Oxford University Press. ISBN ... Redox zonation refers to how the processes that transfer terminal electrons as a result of organic matter degradation vary ...
Glass transition
Jonson, M.; Girvin, S. M. (1979). "Electron-Phonon Dynamics and Transport Anomalies in Random Metal Alloys". Phys. Rev. Lett. ... Such theories of localization have been applied to transport in metallic glasses, where the mean free path of the electrons is ... Thus, if the electrical conductivity is low, the mean free path of the electrons is very short. The electrons will only be ... Duwez, Pol; Willens, R. H.; Klement, W. (1960). "Metastable Electron Compound in Ag-Ge Alloys". Journal of Applied Physics. 31 ...
Transporter Classification Database
See electron transport chain. 3.D.1 The H+ or Na+-translocating NADH Dehydrogenase ("complex I") family 3.D.2 The Proton- ... family 1.B.78 DUF3374 electron transport-associated porin (ETPorin) family 1.C.3 α-Hemolysin (αHL) family 1.C.4 Aerolysin ... Family 3.B.1 The Na+-transporting Carboxylic Acid Decarboxylase (NaT-DC) Family 3.C.1 The Na+ Transporting ... Family 1.D.58 The Anion Transporting Prodigiosene (Prodigiosene) Family 1.D.59 The Anion Transporting Perenosin (Perenosin) ...
Cell membrane
Processes such as electron transport and generating ATP use proton pumps.[3] A G-protein coupled receptor is a single ... Endocytosis requires energy and is thus a form of active transport. 4. Exocytosis: Just as material can be brought into the ... The cell membrane is selectively permeable and able to regulate what enters and exits the cell, thus facilitating the transport ... The cell employs a number of transport mechanisms that involve biological membranes: 1. Passive osmosis and diffusion: Some ...
Cell membrane
Processes such as electron transport and generating ATP use proton pumps.[4] A G-protein coupled receptor is a single ... Endocytosis requires energy and is thus a form of active transport. 4. Exocytosis: Just as material can be brought into the ... The cell membrane is selectively permeable and able to regulate what enters and exits the cell, thus facilitating the transport ... Alberts B, Johnson A, Lewis J, Raff M, Roberts K, Walter P (2002). "The Transport of Molecules between the Nucleus and the ...
Carver Mead
... developing a deep understanding of electron tunneling, barrier behavior and hot-electron transport.[11] In 1960, he was the ... Mead, C. A. (1 July 1962). "Transport of Hot Electrons in Thin Gold Films". Physical Review Letters. 9 (1): 46-46. Bibcode: ... a three-terminal solid-state device based on the operating principles of electron tunnelling and hot-electron transport.[12] In ... Diorio, C.; Hasler, P.; Minch, A.; Mead, C.A. (1995). "A single-transistor silicon synapse". IEEE Transactions on Electron ...
Glossary of biology
electron transport chain. The process of oxidative phosphorylation, by which the NADH and succinate generated by the citric ... Contrast electron acceptor.. electron microscope. A type of microscope that uses a beam of electrons to create an image of a ... Contrast electron donor.. electron carrier. Any of various molecules that are capable of accepting one or two electrons from ... A form of active transport and bulk transport in which a cell transports molecules out of the cell by expelling them through an ...
Laura E. Little
Ascorbic acid and electron transport". Annals of the New York Academy of Sciences. 258: 190-200. doi:10.1111/j.1749-6632.1975. ...
Judy Hirst
Electron transport in redox enzymes. bodleian.ox.ac.uk (DPhil thesis). University of Oxford. OCLC 557413704. EThOS uk.bl.ethos. ... Oxford for research supervised by Fraser Armstrong on the electron transport in redox enzymes in 1997. Following her D.Phil., ... and for solving its structure by electron cryomicroscopy'. Publications http://www.mrc-mbu.cam.ac.uk/people/judy-hirst/ ...
Fraser Armstrong (professor)
2012 The Royal Society of Chemistry Barker Award Hirst, Judy (1997). Electron transport in redox enzymes. bodleian.ox.ac.uk ( ... in particular the application of dynamic electrochemical techniques in studies of complex electron-transfer and catalytic ...
Biswa Ranjan Nag
He contributed to the development of electron transport theory related to semiconductors and developed a Monte Carlo method for ... 5-. ISBN 978-3-642-10571-5. Nag, B.R (2017). Electron Transport in Compound Semiconductors. Table of Contents. Springer Series ... He authored three monographs, Theory of electrical transport in semiconductors, Physics of Quantum Well Devices and Electron ... ISBN 978-0-306-47127-8. B.R. Nag (6 December 2012). Electron Transport in Compound Semiconductors. Springer Science & Business ...
Silke Bühler-Paschen
In 1995 she earned her PhD with her thesis titled "Electron transport in polymer composites" at École Polytechnique Fédérale de ... "Electron transport in polymer composites". EPFL. Retrieved March 15, 2020. "Movers - Silke Bühler-Paschen, professor, Technical ... "Switching electron properties on and off individually". August 22, 2019. Retrieved March 16, 2020. "Switching electron ... She realized the individual toggling of different electronic degrees of freedom in correlated electron systems. Bühler-Paschen ...
Leigh syndrome
Without ATP synthase, the electron transport chain will not produce any ATP.[1] The most common MT-ATP6 mutation found with ... though the mutations in cytochrome c oxidase and other electron transport chain proteins were not discovered until 1977.[6] ... the fourth complex in the mitochondrial electron transport chain. Though the subunits of the protein found in affected cells ... Two healthy mitochondria from mammalian lung tissue as shown by electron microscopy ...
Plasma cell
They are transported by the blood plasma and the lymphatic system. Plasma cells originate in the bone marrow; B cells ... Their cytoplasm also contains a pale zone that on electron microscopy contains an extensive Golgi apparatus and centrioles (EM ...
Cell membrane - Simple English Wikipedia, the free encyclopedia
Transmission electron microscope (TEM) image of a lipid vesicle. The two dark bands around the edge are the two leaflets of the ... These proteins mainly transport chemicals and information across the membrane.[3]. The membrane contains many proteins. The ...
Positron emission tomography
... until it decelerates to a point where it can interact with an electron.[35] The encounter annihilates both electron and ... which has a half-life of 110 minutes and can be transported a reasonable distance before use, or to rubidium-82 (used as ... Recently rubidium-82 generators have become commercially available.[33] These contain strontium-82, which decays by electron ... The most significant fraction of electron-positron annihilations results in two 511 keV gamma photons being emitted at almost ...
Leaf
... while major veins are responsible for its transport outside of the leaf. At the same time water is being transported in the ... Scanning electron microscope image of trichomes on the lower surface of a Coleus blumei (coleus) leaf ... Vascular plants transport sucrose in a special tissue called the phloem. The phloem and xylem are parallel to each other, but ... Once sugar has been synthesized, it needs to be transported to areas of active growth such as the plant shoots and roots. ...
Ebola
Ryabchikova, Elena I.; Price, Barbara B. (2004). Ebola and Marburg Viruses: A View of Infection Using Electron Microscopy. ... "West Africa - Ebola virus disease Update: Travel and transport". International travel and health. World Health Organization ( ... Transport, travel, contact. Transportation crews are instructed to follow a certain isolation procedure, should anyone exhibit ... An electron microscopist from USAMRIID discovered filoviruses similar in appearance to Ebola in the tissue samples sent from ...
Chloroplast DNA
4.2 Phosphorylation, chaperones, and transport. *4.3 The translocon on the outer chloroplast membrane (TOC) *4.3.1 Toc34 and 33 ... Scientists have attempted to observe chloroplast replication via electron microscopy since the 1970s.[17][18] The results of ... Phosphorylation, chaperones, and transportEdit. After a chloroplast polypeptide is synthesized on a ribosome in the cytosol, ... its genes encode eleven subunits of a protein complex which mediates redox reactions to recycle electrons,[24] which is similar ...
Transistor
... in which a two-dimensional electron gas with very high carrier mobility is used for charge transport, are especially suitable ... The electron mobility and hole mobility columns show the average speed that electrons and holes diffuse through the ... By controlling the number of electrons that can leave the base, the number of electrons entering the collector can be ... electrons and holes are formed at, and move away from the junction), and electrons are injected into the base region. Because ...
Endoplasmic reticulum - Simple English Wikipedia, the free encyclopedia
5 Ribosome on the rough ER 6 Proteins that are transported 7 Transport vesicle 8 Golgi apparatus 9 Cis face of the Golgi ... Porter K.R; Claude A. & Fullam E.F. (1945). "A study of tissue culture cells by electron microscopy". J Exp Med. 81 (3): 233- ... It is the transport network for molecules going to specific places, as compared to molecules that float freely in the cytoplasm ... Electron micrograph of rough endoplasmic reticulum network around the nucleus (shown in lower right-hand side of the picture). ...
Technology
The ancient Romans also had a complex system of aqueducts,[52] which were used to transport water across long distances.[52] ... For example, science might study the flow of electrons in electrical conductors by using already-existing tools and knowledge. ... The rise in technology has led to skyscrapers and broad urban areas whose inhabitants rely on motors to transport them and ... Main article: History of transport. Meanwhile, humans were learning to harness other forms of energy. The earliest known use of ...
Diagenesis
Early diagenesis in newly formed aquatic sediments is mediated by microorganisms using different electron acceptors as part of ...
NADH deshidroxenase, a enciclopedia libre
Hatefi, Y. (1985): "The mitochondrial electron transport and oxidative phosphorylation system". Ann Rev Biochem, 54:1015-1069. ...
Picornavirus
MP and VPg interact to provide specificity for the transport of viral RNA from cell to cell. To fulfill energy requirements, MP ... using X-ray crystallography and cryo-electron microscopy. Depending on the type and degree of dehydration the viral particle is ...
Electron transport chain - Simple English Wikipedia, the free encyclopedia
An electron transport chain (ETC) is how a cell gets energy from sunlight in photosynthesis. Electron transport chains also ... Electron transport chain. A process in which a series of electron carriers operate together to transfer electrons from donors ... The electron transport chain consists of a series of redox reactions in which electrons are transferred from a donor molecule ... This is the result of the series of redox reactions.[2] What the electron transport chain does is produce this gradient.[3][4] ...
Viroplasm
These appear electron-dense under an electron microscope and are insoluble. Viroplasms are localized in the perinuclear area or ... An aggresome is a perinuclear site where misfolded proteins are transported and stored by the cell components for their ... There are many viroplasms in one infected cell, where they appear dense to electron microscopy. Very little is understood about ... Disruption of cellular membranes can, for example, slow the transport of immunomodulatory proteins to the surface of infected ...
HADHB
Electron transport chain. *Fatty acid synthetase complex. *Glycine decarboxylase complex. *Mitochondrial trifunctional protein ...
Cell biology
Active transport and Passive transport - Movement of molecules into and out of cells. ... transmission electron microscopy, etc. have allowed scientists to get a better idea of the structure of cells.[8] ...
فهرست یهودیان برنده جایزه نوبل - ویکیپدیا، دانشنامهٔ آزاد
for "their discoveries of machinery regulating vesicle traffic, a major transport system in our cells"[۸۱] ... "for his contributions to the theory of electron transfer reactions in chemical systems"[۳۴] ... "for his pioneering studies of electron scattering in atomic nuclei and for his thereby achieved discoveries concerning the ... "for his pioneering investigations concerning deep inelastic scattering of electrons on protons and bound neutrons, which have ...
Superoxide dismutase
... when it absorbs an excited electron released from compounds of the electron transport chain. Superoxide is known to denature ...
پرتو کیهانی - ویکیپدیا، دانشنامهٔ آزاد
... stripped of their electron shells), and about 1% are solitary electrons (similar to beta particles). Of the nuclei, about 90% ... 2011). Australian Transport Safety Bureau. *^ https://cars.usnews.com/cars-trucks/daily-news/100317-cosmic-rays-may-be-causing- ... Hence, next to photons electrons and positrons usually dominate in air showers. These particles as well as muons can be easily ... At higher energies, up to 500 GeV, the ratio of positrons to electrons begins to fall again. The absolute flux of positrons ...
Clathrin
Coat-proteins, like clathrin, are used to build small vesicles in order to transport molecules within cells. The endocytosis ... "Molecular model for a complete clathrin lattice from electron cryomicroscopy". Nature. 432 (7017): 573-9. doi:10.1038/ ... allowing the clathrin to recycle while the vesicle gets transported to a variety of locations. ...
Vitamin C
Transport[edit]. SVCTs appear to be the predominant system for vitamin C transport in the body,[102] the notable exception ... UDP-glucose 6-dehydrogenase uses the co-factor NAD+ as the electron acceptor. The transferase UDP-glucuronate pyrophosphorylase ... Ascorbic acid is absorbed in the body by both active transport and simple diffusion. Sodium-Dependent Active Transport-Sodium- ... Wilson JX (2005). "Regulation of vitamin C transport". Annual Review of Nutrition. 25: 105-125. doi:10.1146/annurev.nutr. ...
Bacterial nanowires
... these nanowires can transport electrons up to centimetre-scale distances.[13] Long-range electron transfer via pili networks ... Nanowires may function as conduits for electron transport between different members of a microbial community.[10] ... In microbial fuel cells (MFCs), bacterial nanowires generate electricity via extracellular electron transport to the MFC's ... Species of the genus Geobacter use nanowires to transfer electrons to extracellular electron acceptors (such as Fe(III) oxides ...
Solar cell
... one electron donor and one electron acceptor. When a photon is converted into an electron hole pair, typically in the donor ... European Commission, Joint Research Centre, Institute for Energy and Transport. *^ PV production grows despite a crisis-driven ... Electrons are excited from their current molecular/atomic orbital. Once excited an electron can either dissipate the energy as ... The absorption of light, generating either electron-hole pairs or excitons.. *The separation of charge carriers of opposite ...
Princeton Plasma Physics Laboratory
Studies of electron heating in PFRC-2 reached 500 eV with pulse lengths of 300 ms.[11] ... National Transport Code Collaboration (NTCC) Modules Library. See alsoEdit. *Project Sherwood ...
Гольберг, Дмитрий Викторович - Википедия
Nitrogen-doped carbon nanotube structure tailoring and time-resolved transport measurements in a transmission electron ... G. Dmitri, Y. Bando : «Electron Microscopy of Boron Nitride Nanotubes» Electron Microscopy of Nanotubes (2003) ... In situ growth of Indium nanocrystals on InP nanorods mediated by electron beam of transmission electron microscope» Chem. Phys ... Electron-beam irradiation induced conductivity in ZnS nanowires as revealed by in situ transmission electron microscope» J. ...
Plant virus
Plants also reduce transport through plasmodesmata in response to injury. The discovery of plant viruses causing disease is ... Viruses are extremely small and can only be observed under an electron microscope. The structure of a virus is given by its ... Plants have specialized mechanisms for transporting mRNAs through plasmodesmata, and these mechanisms are thought to be used by ... therefore transport through plasmodesmata is the preferred path for virions to move between plant cells. ...
Electron beam-induced current
"Trap-related carrier transports in p-channel field effect transistor with polycrystallin Si/HSiON gate stack", Japanese Journal ... Electron-beam-induced current (EBIC) is a semiconductor analysis technique performed in a scanning electron microscope (SEM) or ... In EBIC, energetic electrons take the role of the photons, causing the EBIC current to flow. However, because the electron beam ... W. S. Lau, D. S. H. Chan, J. C. H. Phang, K. W. Chow, K. S. Pey, Y. P. Lim and B. Cronquist, "True oxide electron beam induced ...
Electric battery
Cations are reduced (electrons are added) at the cathode, while metal atoms are oxidized (electrons are removed) at the anode.[ ... Important reasons for this high rate of growth of the electric battery industry include the electrification of transport,[78] ... Batteries are designed so that the energetically favorable redox reaction can occur only when electrons move through the ... "liquid electrolytes to transport lithium ions between the anode and the cathode. If a battery cell is charged too quickly, it ...
Electron Transport in Facultative Anaerobes | SpringerLink
Electron transport chains in bacteria Facultative anaerobes are organisms able to grow in the presence or absence of molecular ... Simon J. (2018) Electron Transport in Facultative Anaerobes. In: Roberts G., Watts A., European Biophysical Societies (eds) ... Figure 1 depicts the corresponding electron transport network from the facultatively anaerobic bacterium Escherichia coli. ... In anaerobic respiration a variety of alternative terminal electron acceptors can be used by facultative anaerobes. Prominent ...
What is the Electron Transport Chain?
The electron transport chain is comprised of a series of enzymatic reactions within the inner membrane of the mitochondria, ... Electrons move through the electron transport chain from a higher to lower energy state. Energy release moves protons through ... uncouple the electron transport chain in order to dissipate the energy as heat. This is accomplished through a transport ... The electron transport chain is comprised of a series of enzymatic reactions within the inner membrane of the mitochondria, ...
SparkNotes: Oxidative Phosphorylation and Electron Transport: Introduction
This free synopsis covers all the crucial plot points of Oxidative Phosphorylation and Electron Transport. ... These electrons then pass through a series of four protein complexes called the electron transport chain. The energy produced ... Next, we will discuss electron flow through the electron transport chain and ATP synthesis through oxidative phosphorylation. ... Home → SparkNotes → Biology Study Guides → Oxidative Phosphorylation and Electron Transport → Introduction. Oxidative ...
Macroscopic and microscopic fields in electron and atom transport | SpringerLink
What Is the Electron Transport Chain? | Reference.com
The electron transport chain is a chemical reaction where electrons are transferred from a high-energy molecule to a low-energy ... The electron transport chain is a chemical reaction where electrons are transferred from a high-energy molecule to a low-energy ... Why Do Some Atoms Gain or Lose Electrons to Form Ions?. A: Atoms gain or lose electrons based on their respective electron ... The electron transport chain is critical to the production of adenosine triphosphate, or ATP, which is a source of energy for ...
Photosynthesis I : photosynthetic electron transport and phosphorylation (Book, 1977) [WorldCat.org]
... photosynthetic electron transport and phosphorylation. [Achim Trebst; Mordhay Avron; R S Alberte; et al] ... Noncyclic Electron Transport.- IV. Cyclic Electron Transport.- V. Pseudocyclic Electron Transport.- VI. Regulation of Electron ... Relation of Electron Transport to Phosphorylation.- I. Electron Transport Patterns.- II. Coupling Between Electron Transport ... Electron Transport.- 1. General 1 a. Physical Aspects of Light Harvesting, Electron Transport and Electrochemical Potential ...
Electron thermal transport in tokamak plasmas (Thesis/Dissertation) | ETDEWEB
title = {Electron thermal transport in tokamak plasmas}. author = {Konings, J A}. abstractNote = {The process of fusion of ... Konings, J A. Electron thermal transport in tokamak plasmas. Netherlands: N. p., 1994. Web. ... This `anomalous transport` of thermal energy implies that, to reach the condition for nuclear fusion, a fusion reactor must ... This `anomalous transport` of thermal energy implies that, to reach the condition for nuclear fusion, a fusion reactor must ...
Nonlinear Closure Relations for Electron Transport in Hydrodynamical Models
the electron momentum, the electron group velocity given by. , where is the energy, the absolute value of electron charge, the ... B. K. Blotekjaer, "Transport equations for electrons in two-valley semiconductors," IEEE Transactions on Electron Devices, vol ... is the effective electron mass which in silicon is with the electron mass and the reduced Plancks constant is taken as for ... 300 K) and the electron temperature as (resp. ) with in the case of partial thermal equilibrium. ...
Powering off TB: New electron transport gene is a potential drug target
One such essential process is electron transport, which powers all life forms by shuttling electrons between key protein ... "Powering off TB: New electron transport gene is a potential drug target ." Medical News Today. MediLexicon, Intl., 13 Aug. 2015 ... 2015, August 13). "Powering off TB: New electron transport gene is a potential drug target ." Medical News Today. Retrieved ... Powering off TB: New electron transport gene is a potential drug target ...
Rate enhancement of bacterial extracellular electron transport involves bound flavin semiquinones | PNAS
Bacterial extracellular electron transport (EET) to solid electron acceptors, such as Fe(III)- and Mn(IV)-oxide minerals and ... A cell-surface decaheme cytochrome involved in respiratory electron transport to extracellular electron acceptors. J Biol Inorg ... where k0 is a standard rate constant, n is the number of electrons, α is an electron transfer coefficient, and ΔE is the ... Rate enhancement of bacterial extracellular electron transport involves bound flavin semiquinones Message Subject (Your Name) ...
Where does the electron transport chain take place? | Reference.com
Electron transport is the last stage of cell respiration. The chain passes high-energy electrons... ... The electron transport chain takes place in the membranes of the mitochondria in eukaryotic cells. ... The electron transport chain takes place in the membranes of the mitochondria in eukaryotic cells. Electron transport is the ... Rotenone is in the class of electron transport inhibitors, which bind at some point on the transport chain, keeping electrons ...
electron transport | mBio
Electron Transport Chain Deficiencies: Mitochondrial | GreenMedInfo
Electron Transport Chain Deficiencies: Mitochondrial Related Articles. Groundbreaking Discovery: Animal Cells Powered by ... 2 Abstracts with Electron Transport Chain Deficiencies: Mitochondrial Research. Filter by Study Type. Animal Study. ... Diseases : Electron Transport Chain Deficiencies: Mitochondrial, Metabolic Syndrome X, Mitochondrial Dysfunction Problem ... 1 Substances Researched for Electron Transport Chain Deficiencies: Mitochondrial Name. AC. CK. Focus. ...
electron-transport chain facts, information, pictures | Encyclopedia.com articles about electron-transport chain
Make research projects and school reports about electron-transport chain easy with credible articles from our FREE, online ... and pictures about electron-transport chain at Encyclopedia.com. ... electron-transport chain A Dictionary of Plant Sciences © A ... electron-transport chain (respiratory chain) A system of electron carriers, present in mitochondria and the cell membranes of ... electron-transport chain 1. Respiratory chain. A system of redox compounds called electron carriers, present in mitochondria, ...
Long-range electron transport in Geobacter sulfurreducens biofilms is redox gradient-driven | PNAS
multistep electron hopping. It is widely accepted that electron transport can occur over molecular-scale distances in ... 23), which attributes long-range electron transport through Geobacter biofilms not to multistep electron hopping but to an ... the presence of redox gradient that drives electron transport through the biofilm to electrode 1 when such electron transport ... of biofilm electron transport to an anode coupled to acetate oxidation with measurements of biofilm electron transport between ...
Biological electron transport goes the extra mile (Journal Article) | DOE PAGES
Macroscopic Ballistic Electron Transport in 2D Electron Systems. - Nokia Bell Labs
Transport of Energetic Electrons in Solids - Computer | Maurizio Dapor | Springer
... transport MC) and presents some physical problems related to the transport of hot electrons in solid targets using transport MC ... Transport of Energetic Electrons in Solids. Book Subtitle. Computer Simulation with Applications to Materials Analysis and ... Transport of Energetic Electrons in Solids. Computer Simulation with Applications to Materials Analysis and Characterization. ... This book focusses on the study of the electron-solid interaction ( ...
Short Wavelength Fluctuations and Electron Transport in TFTR - Digital Library
... and their values are consistent with the picture that the electron transport is mainly induced by the short wavelength ... Correlation between electron heat diffusivity and short wavelength (kri {approximately} 5) fluctuation amplitude was observed ... Wong, K.L.; Itoh, K.; Itoh, S.-I.; Fukuyama, A. & Yagi, M. Short Wavelength Fluctuations and Electron Transport in TFTR, report ... and their values are consistent with the picture that the electron transport is mainly induced by the short wavelength ...
Electron transport chain - The Full Wiki
Electron transport chains are redox reactions that transfer electrons from an electron donor to an electron acceptor. The ... An electron transport chain (ETC) couples a chemical reaction between an electron donor (such as NADH) and an electron acceptor ... The mitochondrial electron transport chain removes electrons from an electron donor (NADH or QH2) and passes them to a terminal ... Electrons may enter an electron transport chain at the level of a mobile cytochrome or quinone carrier. For example, electrons ...
Electron Transport Chain, Phosphorylation
... oxygen enters the respiration pathway as the electron acceptor at the end of the electron transport chain. ... oxygen enters the respiration pathway as the electron acceptor at the end of the electron transport chain. ... The transport chain often is likened to a series of magnets, each stronger than the last, which pull electrons from one weaker ... The oxidation takes place in a series of steps, like the electron chain of photosynthesis, but with different transport ...
The Electron Transport Chain
Electrons flow through the electron transport chain to molecular oxygen; during this flow, protons are moved across the inner ... mobile electron transport protein, cytochrome c. Cytochrome c transfers its electrons to the final electron transport component ... Electrons flow through the electron transport chain to molecular oxygen; during this flow, protons are moved across the inner ... accepts electrons from NADH. The NADH releases a proton and two electrons. The electrons flow through a flavoprotein containing ...
Electron Transport Chains | Protocol (Translated to Portuguese)
From there, the electrons are transferred to the mobile electron carrier cytochrome c (cyt c). Cyt c delivers the electrons to ... Generally, molecules of the electron transport chain are organized into four complexes (I-IV). The molecules pass electrons to ... Both NADH and FADH2 transfer electrons to ubiquinone, a mobile electron carrier that passes the electrons to complex III. ... The electron transport chain is a set of proteins and other organic molecules found in the inner membrane of mitochondria in ...
Electron Transport Chain / Oxidative Phosphorylation | S-cool, the revision website
The electron carriers are at successively lower energy levels hence, as the electron moves on from one carrier to the next some ... Each hydrogen atom is split into its constituent H+ (hydrogen ion) and electron. The electron is the part that actually gets ... Oxygen acts as the final electron acceptor in the chain, so the oxygen, electrons and hydrogen ions together form water. ... Electron Transport Chain / Oxidative Phosphorylation. Production of ATP using NADH and FADH. ...
Explain the operation of the electron transport chain in the development ATP | eNotes
Explain the operation of the electron transport chain in the development ATP and find homework help for other Science ... The electron transport chain, as the name suggests, is a series of passing on electrons to atoms or molecules that are more ... The electron transport chain, as the name suggests, is a series of passing on electrons to atoms or molecules that are more ... Explain how the electron transport chain (and ATP-synthase) works. Please include the inputs and... ...
Fractional quantum Hall effect in suspended graphene: Transport coefficients and electron interaction strength
Transport coefficients and electron interaction strength. Author(s). Levitov, Leonid; Abanin, Dmitry A.; Skachko, I.; Du, X.; ... "Fractional quantum Hall effect in suspended graphene: Transport coefficients and electron interaction strength." Physical ... on which only two-terminal transport measurements could be performed. Here we address the problem of extracting transport ... The gap is found to be significantly larger than in GaAs-based structures, signaling much stronger electron interactions in ...
COXINEL transport of laser plasma accelerated electrons - Archive ouverte HAL
We report here on detailed electron beam transport for an LPA electron beam on the COXINEL test line, that consists of strong ... After describing the measured LPA characteristics, we show that we can properly transport the electron beam along the line, ... We then study the sensitivity of the transport to the electron beam pointing and skewed quadrupolar components. ... We also illustrate the influence of the chromatic effects induced by the electron beam energy spread, both experimentally and ...
Electron transport chain - Wikipedia
... electrons from inorganic electron donors (nitrite, ferrous iron, electron transport chain.) enter the electron transport chain ... The electron transport chain (ETC) is a series of protein complexes that transfer electrons from electron donors to electron ... The electron transport chain is built up of peptides, enzymes, and other molecules. The flow of electrons through the electron ... The electron transport chain comprises an enzymatic series of electron donors and acceptors. Each electron donor will pass ...
Electron Transport Chain, illustration - Stock Image C027/8502 - Science Photo Library
The overall electron chain transport reaction is: 2H+ + 2e+ + 1/2O2 ---, H2O + energy. This reaction actually involves eight or ... Here a series of reactions occurs in which electrons are transported to meet up with oxygen from respiration. ... Every use of the electron transport chain results in the production of three ATP molecules. - Stock Image C027/8502 ... A series of redux reactions moves electrons from a donor (NADH or QH2) to an acceptor (O2). A proton gradient is created across ...
MitochondriaAcceptorsAcceptorInner mitochonCytochromePROTONSOxidative phosphorylationPhotosynthesisMoleculesDonorChainOxygenHydrogenFADH2High-energy electronsAdenosine triphosphatePathwayMitochondrial electron transportExtracellular electron transportRespirationProtein complexesAtomsCarrierCarriersReactionsMembraneAccepts electronsProteinsPhononsPhotosystemSuccinate DehydrogenaseNADPHUbiquinoneTransferInhibitorsCoenzymeMoleculeOccursFlavinReductionMeasurementsLong-range electron transportMovesProton gradientCofactorsChainsBeam lithographyChloroplasts
Mitochondria17
- The electron transport chain is comprised of a series of enzymatic reactions within the inner membrane of the mitochondria, which are cell organelles that release and store energy for all physiological needs. (news-medical.net)
- Although electron transport chains and mitochondria are characteristic of eukaryotic cells, some bacteria and Archaea have similar features. (reference.com)
- The electron transport chain takes place in the membranes of the mitochondria in eukaryotic cells. (reference.com)
- A system of redox compounds called electron carriers, present in mitochondria , which sequentially transport electrons and/or protons previously removed from metabolites in glycolysis , the citric-acid cycle , and other metabolic reactions. (encyclopedia.com)
- While some bacteria have electron transport chains similar to those in chloroplasts or mitochondria, other bacteria use different electron donors and acceptors. (thefullwiki.org)
- Illustration of the electron transport chain, a series of protein complexes located in the inner membrane of mitochondria. (sciencephoto.com)
- The electron transport system creates an electron gradient inside the mitochondria along the inner membrane so that when protons re-enter the matrix through the ATP synthase, their potential energy is converted into chemical energy in the form of ATP. (brightstorm.com)
- Measurements of ubiquinone redox poise in isolated mitochondria suggested that SA blocked electron flow from the substrate dehydrogenases to the ubiquinone pool. (plantphysiol.org)
- The electron transport chain ( ETC ) is located in the inner membrane of the mitochondria . (nodak.edu)
- The PPR40 protein is localized in the mitochondria and found in association with Complex III of the electron transport system. (plantphysiol.org)
- GOT1 normally consumes aspartate to transfer electrons into mitochondria, but, upon ETC inhibition, it reverses to generate aspartate in the cytosol, which partially compensates for the loss of mitochondrial aspartate synthesis. (nih.gov)
- In contrast, an analogous ETC module from mitochondria could not function in electron transfer to nitrogenase. (jic.ac.uk)
- It is concluded that the cytostatic inhibitory effects of mycothiazole on mitochondrial electron transport function in sensitive cell lines may depend on a pre-activation step that is absent in insensitive cell lines with intact mitochondria, and that a second lower-affinity cytotoxic target may also be involved in the metabolic and growth inhibition of cells. (mdpi.com)
- Direct supplementation of CL to isolated mitochondria not only rescues the PINK1- induced complex I defects but also rescues the inefficient electron transfer between complex I and ubiquinone in specific mutants. (rupress.org)
- Oxygen molecules are required for the removal of electrons from the electron transport chain in the mitochondria. (thefreedictionary.com)
- Singh, N., Hroudová, J. and Fisar, Z. (2015) Cannabinoid-Induced Changes in the Activity of Electron Transport Chain Complexes of Brain Mitochondria. (scirp.org)
- The improved survival was not a direct consequence of the absence of electron transport, but rather was attributable to the large amounts of NADH which accumulate in the mitochondria of chemically hypoxic or respiration-deficient cells. (aspetjournals.org)
Acceptors12
- In anaerobic respiration a variety of alternative terminal electron acceptors can be used by facultative anaerobes. (springer.com)
- Bacterial extracellular electron transport (EET) to solid electron acceptors, such as Fe(III)- and Mn(IV)-oxide minerals and artificial electrodes, represents a central driving force for geochemical mineral cycling and bioelectrical systems ( 1 ⇓ - 3 ). (pnas.org)
- MR-1 expresses a significant quantity of cell-surface redox-active proteins, namely the c- type cytochromes ( c- Cyts), which form a hypothetical protein complex "OmcA-MtrCAB" ( 6 , 7 ) in which these proteins work together to transport electrons generated by the intracellular metabolic oxidation of organic matter to solid extracellular electron acceptors as a terminal process in microbial respiration ( 8 ⇓ - 10 ). (pnas.org)
- that can use electron acceptors residing outside the cell for respiration ( 3 ). (pnas.org)
- The electron transport chain (ETC) is a series of protein complexes that transfer electrons from electron donors to electron acceptors via redox reactions (both reduction and oxidation occurring simultaneously) and couples this electron transfer with the transfer of protons (H+ ions) across a membrane. (wikipedia.org)
- In anaerobic respiration, other electron acceptors are used, such as sulfate. (wikipedia.org)
- The electron transport chain comprises an enzymatic series of electron donors and acceptors. (wikipedia.org)
- Accordingly, the inhibition by the other compounds seemingly interfering at the same site as well as that by electron acceptors could be due to interference at a different redox step in desaturation. (biomedsearch.com)
- In vitro these compounds function also as electron acceptors in diaphorase reactions catalyzed by ferredoxin:NADP oxidoreductase. (biomedsearch.com)
- Here we present LMD simulations of charge transfer between a pair of fullerene molecules, which commonly serve as electron acceptors in OSCs. (rsc.org)
- Here we have applied variable fluorescence measurements and EPR spectroscopy to probe the status of the quinone acceptors, the Mn cluster and other electron transfer components in PS II with controlled levels of protein phosphorylation. (lu.se)
- Arrange the following electron acceptors in the proper order in which they participate in electron transport. (mhhe.com)
Acceptor21
- According to Reference.com, in an electron transport chain, the high-energy molecule that gives up the election is called the donor, while the low-energy molecule that is getting the electron is called the acceptor. (reference.com)
- These electrons are passed from the donor molecule to the acceptor oxygen molecule through a membrane, creating hydrogen ions that are used in ATP. (reference.com)
- Oxygen is used as an electron acceptor within the electron transport chain of aerobic respiration to generate adenosine triphosphate, or ATP. (reference.com)
- An electron transport chain (ETC) couples a chemical reaction between an electron donor (such as NADH ) and an electron acceptor (such as O 2 ) to the transfer of H + ions across a membrane , through a set of mediating biochemical reactions. (thefullwiki.org)
- Redox reactions are chemical reactions in which electrons are transferred from a donor molecule to an acceptor molecule. (thefullwiki.org)
- The transfer of electrons from a high-energy molecule (the donor) to a lower-energy molecule (the acceptor) can be spatially separated into a series of intermediate redox reactions. (thefullwiki.org)
- After the Krebs cycle is completed, oxygen enters the respiration pathway as the electron acceptor at the end of the electron transport chain. (cliffsnotes.com)
- The last acceptor in the line is oxygen, an atom of which accepts two energy‐depleted electrons and two hydrogen ions (protons) and forms a molecule of water. (cliffsnotes.com)
- Oxygen acts as the final electron acceptor in the chain, so the oxygen, electrons and hydrogen ions together form water. (s-cool.co.uk)
- In aerobic respiration, the flow of electrons terminates with molecular oxygen being the final electron acceptor. (wikipedia.org)
- Each electron donor will pass electrons to a more electronegative acceptor, which in turn donates these electrons to another acceptor, a process that continues down the series until electrons are passed to oxygen, the most electronegative and terminal electron acceptor in the chain. (wikipedia.org)
- Passage of electrons between donor and acceptor releases energy, which is used to generate a proton gradient across the mitochondrial membrane by "pumping" protons into the intermembrane space, producing a thermodynamic state that has the potential to do work. (wikipedia.org)
- A series of redux reactions moves electrons from a donor (NADH or QH2) to an acceptor (O2). (sciencephoto.com)
- Unlike POR, OOR was unable to use a previously identified flavodoxin (FldA) as an electron acceptor. (asm.org)
- The in vivo electron acceptor of this enzyme is likely to be an endogenous flavodoxin, which was partially purified and shown to be reduced by POR. (asm.org)
- This decreased electron transfer may induce the over-reduction of the plastoquinone pool and consequently the appearance of acceptor side photoinhibition in PSII even at low light intensities. (frontiersin.org)
- Current production of the Aro-5 strain, with a graphite anode serving as the electron acceptor, was less than 10% of that of the control strain. (asm.org)
- It is concluded that this technique can be used to study the functional organization of the anaerobic proton-translocating electron-transport chains that use nitrate or fumarate as terminal electron acceptor. (portlandpress.com)
- We study here several simple models of the electron transfer (ET) in a one-dimensional nonlinear lattice between a donor and an acceptor and propose a new fast mechanism of electron surfing on soliton-like excitations along the lattice. (ucm.es)
- In a heated system, the electron transfer between a donor and an acceptor is modeled as a diffusion-like process. (ucm.es)
- Electron transport chains are redox reactions that transfer electrons from an electron donor to an electron acceptor. (powershow.com)
Inner mitochon8
- The redox reaction is simultaneously coupled to the transport of PROTONS across the inner mitochondrial membrane. (nih.gov)
- In eukaryotes, the electron transport chain is located in the inner mitochondrial membrane. (news-medical.net)
- The reactions of the electron transport chain involve several large membrane protein complexes within the inner mitochondrial membrane. (news-medical.net)
- In eukaryotic organisms the electron transport chain, and site of oxidative phosphorylation, is found on the inner mitochondrial membrane. (wikipedia.org)
- The energy stored from the process of respiration in reduced compounds (such as NADH and FADH) is used by the electron transport chain to pump protons into the intermembrane space, generating the electrochemical gradient over the inner mitochondrial membrane. (wikipedia.org)
- At the inner mitochondrial membrane, electrons from NADH and FADH2 pass through the electron transport chain to oxygen, which is reduced to water. (wikipedia.org)
- Energy obtained through the transfer of electrons down the electron transport chain is used to pump protons from the mitochondrial matrix into the intermembrane space, creating an electrochemical proton gradient (ΔpH) across the inner mitochondrial membrane. (wikipedia.org)
- a group of specific carrier molecules in the inner mitochondrial membrane that transfer electrons from hydrogen to oxygen. (thefreedictionary.com)
Cytochrome16
- It is the terminal oxidase complex of the RESPIRATORY CHAIN and collects electrons that are transferred from the reduced CYTOCHROME C GROUP and donates them to molecular OXYGEN, which is then reduced to water. (nih.gov)
- Cytochrome c oxidase is the last step in the electron transport chain. (news-medical.net)
- It accepts two electrons from two cytochrome c molecules and passes them four at a time to oxygen. (news-medical.net)
- Electrons flow from succinate to FAD (the flavin‐adenine dinucleotide) coenzyme, through an iron‐sulfur protein and a cytochrome b 550 protein (the number refers to the wavelength where the protein absorbs), and to coenzyme Q. No protons are translocated by Complex II. (cliffsnotes.com)
- It accepts electrons from reduced coenzyme Q, moves them within the complex through two cytochromes b, an iron‐sulfur protein, and cytochrome c 1 . (cliffsnotes.com)
- Complex III transfers its electrons to the heme group of a small, mobile electron transport protein, cytochrome c . (cliffsnotes.com)
- Cytochrome c transfers its electrons to the final electron transport component, Complex IV , or cytochrome oxidase . (cliffsnotes.com)
- Cytochrome oxidase transfers electrons through a copper‐containing protein, cytochrome a, and cytochrome a 3 , and finally to molecular oxygen. (cliffsnotes.com)
- The light-driven reactions take place in the thylakoid membranes and three major membrane-intrinsic protein complexes carry out photosynthetic electron transfer, photosystem II, the cytochrome bf complex and photosystem I. To elucidate photosynthetic electron transport in oxygenic photosynthesis site-directed mutagenesis and biophysical techniques were employed in cyanobacteria which have the advantage over plants that they are easily genetically manipulated. (illinois.edu)
- This work focused on electron transfer linking the cytochrome bf complex and photosystem I, characterization of the plastoquinol oxidation site of the cytochrome bf complex and electron transfer within the PsaC polypeptide of the photosystem I complex. (illinois.edu)
- This inhibition could not be reversed by adding chemicals that donate electrons to photosystem I, indicating that carriers past the cytochrome b/f complex were not involved. (biomedsearch.com)
- Energy for thermogenesis is provided by an increase in mitochondrial electron transport through the alternative oxidase (Aox), which diverts electron transport from the cytochrome pathway and uncouples ATP production ( Meeuse, 1975 ). (plantphysiol.org)
- Changes to the balance between electron transport and ATP synthesis negatively affect photosynthesis and ultimately the plant's growth, as observed for example in tobacco cytochrome b6f complex loss-of-function mutants. (edu.au)
- In the ppr40-1 mutant the electron transport through Complex III is strongly reduced, whereas Complex IV is functional, indicating that PPR40 is important for the ubiqinol-cytochrome c oxidoreductase activity of Complex III. (plantphysiol.org)
- Depending on the substrate, electrons are transported from Complex I (NADH dehydrogenase) and Complex II (succinate dehydrogenase) through ubiquinon and Complex III (cytochrome c reductase) to cytochrome c and to Complex IV (cytochrome c oxidase [COX]), which produces water. (plantphysiol.org)
- The results of this work suggest that iron deficiency induces partial blocking of the electron transfer between PSII and PSI, due to a lower concentration of the electron donor cytochrome c 6 . (frontiersin.org)
PROTONS11
- As electrons are passed through the chain by a series of oxidation-reduction reactions, energy is released, creating a gradient of hydrogen ions, or protons, across the membrane. (news-medical.net)
- Four protons are thus transported across the membrane in the reaction. (news-medical.net)
- Complex II operates parallel to Complex I. However, no protons are transported into the intermembrane space. (news-medical.net)
- This is accomplished through a transport protein that moves protons down the electrochemical gradient, bypassing ATP synthase. (news-medical.net)
- As electrons are pulled from NADH and FADH 2 , protons (H + ) also are released, and the protein complexes pump them into the intermembrane space. (cliffsnotes.com)
- Because those enzymes do not pump protons, we were able to split electron transport and proton pumping (ATP synthesis) and inquire which of the metabolic deficiencies associated with the loss of oxidative phosphorylation should be attributed to each of the 2 processes. (nih.gov)
- an atom or molecule that does not have the same number of electrons as it has protons. (asu.edu)
- Hydrogen ions (protons) are transported across the membrane. (thefreedictionary.com)
- The source of the protons and electrons is primarily nicotinamide adenine dinucleotide, which is recycled during the reaction. (thefreedictionary.com)
- I think that the protons on one side of the membrane pair with electrons on the other (or inside the double membrane) forming quasi-particle pairs which then form quantum condensate (Bose-Einstein condensate) acting like one global particle with a much higher energy at its disposal. (blogspot.com)
- The transfer of electrons is coupled to the translocation of protons across a membrane, producing a proton gradient. (powershow.com)
Oxidative phosphorylation9
- Now that we have discussed the events of glycolysis and the citric acid cycle , we are ready to explore the electron transport chain and oxidative phosphorylation, the last step in cellular respiration. (sparknotes.com)
- The energy produced from the flow of electrons drives oxidative phosphorylation in which ATP is synthesized via the addition of phosphor (phosphorylation) to ADP. (sparknotes.com)
- Next, we will discuss electron flow through the electron transport chain and ATP synthesis through oxidative phosphorylation . (sparknotes.com)
- The electron transport chain in the mitochondrion is the site of oxidative phosphorylation in eukaryotes . (thefullwiki.org)
- In bacteria, the electron transport chain can vary over species but it always constitutes a set of redox reactions that are coupled to the synthesis of ATP, through the generation of an electrochemical gradient, and oxidative phosphorylation through ATP synthase. (wikipedia.org)
- This entire process is called oxidative phosphorylation since ADP is phosphorylated to ATP by using the electrochemical gradient established by the redox reactions of the electron transport chain. (wikipedia.org)
- The electron transport system is the stage in cellular respiration in which oxidative phosphorylation occurs and the bulk of the ATP is produced. (brightstorm.com)
- The last step of aerobic respiration is known alternately as electron transport system or as oxidative phosphorylation. (brightstorm.com)
- They're also the place where the process of oxidative phosphorylation occurs to produce ATP, using the complexes on the electron transport chain. (hstalks.com)
Photosynthesis5
- Physical Aspects of Light Harvesting, Electron Transport and Electrochemical Potential Generation in Photosynthesis of Green Plants. (worldcat.org)
- 2. A system of redox compounds involved in electron transport in metabolic pathways such as photosynthesis . (encyclopedia.com)
- Electron transport chains are used for extracting energy from sunlight ( photosynthesis ) and from redox reactions such as the oxidation of sugars ( respiration ). (thefullwiki.org)
- The oxidation takes place in a series of steps, like the electron chain of photosynthesis, but with different transport molecules. (cliffsnotes.com)
- As the presence of heavy metals inhibits the electron transport chain in photosynthesis, hence increases the fluorescence emission as an alternative channel to drain the energy collected from the sun. (thefreedictionary.com)
Molecules11
- The reactions of the electron transport chain are carried out by a series of membrane proteins and organic molecules. (news-medical.net)
- Here we show that flavin molecules secreted by Shewanella oneidensis MR-1 enhance the ability of its outer-membrane c -type cytochromes (OM c- Cyts) to transport electrons as redox cofactors, but not free-form flavins. (pnas.org)
- The gradient can be used to transport molecules across membranes. (thefullwiki.org)
- The electron transport chain, as the name suggests, is a series of passing on electrons to atoms or molecules that are more electronegative, with oxygen ultimately being the most electronegative participant. (enotes.com)
- Carbon monoxide molecules bring the electron transport chain in a mitochondrian to a stop by. (enotes.com)
- The electron transport chain is built up of peptides, enzymes, and other molecules. (wikipedia.org)
- Every use of the electron transport chain results in the production of three ATP molecules. (sciencephoto.com)
- Water molecules are broken down to release electrons. (asu.edu)
- The electron transport chain is a series of molecules that accept or donate electrons easily. (asu.edu)
- My research interests are mainly focused on theoretical study and simulation of electron transport and magnetism in atomic-scale nanostructures such as atomic or molecular nanojunctions, single (magnetic) ad-atoms or molecules deposited on various substrates, and so on. (cea.fr)
- Achieving fully spin-polarized electron currents across a special class of molecules bridging two ferromagnetic electrodes. (cea.fr)
Donor4
- NADPH is used as an electron donor for carbon fixation . (thefullwiki.org)
- The process starts with an electron donor, such as NAD+, which will combine readily with a hydrogen atom to become NADH. (enotes.com)
- NADH is the electron donor for the ETC. (nodak.edu)
- Although the purified enzymes were unable to reduce NAD(P), electrons from both pyruvate and 2-oxoglutarate could reduce NADP in cell extracts, consistent with a role for these oxidoreductases in the provision of NADPH as a respiratory electron donor. (asm.org)
Chain57
- What is the Electron Transport Chain? (news-medical.net)
- Schematic representation of the electron transfer chain via chemiosmotic reactions. (news-medical.net)
- Electrons move through the electron transport chain from a higher to lower energy state. (news-medical.net)
- Some specialized fat cells, known as brown fat, uncouple the electron transport chain in order to dissipate the energy as heat. (news-medical.net)
- These electrons then pass through a series of four protein complexes called the electron transport chain. (sparknotes.com)
- The electron transport chain is a chemical reaction where electrons are transferred from a high-energy molecule to a low-energy molecule. (reference.com)
- The electron transport chain is critical to the production of adenosine triphosphate, or ATP, which is a source of energy for living things. (reference.com)
- The electron transfer (ET) chain from the inner to outer membrane (OM) is called the metal reduction (Mtr) pathway and is responsible for both metal-oxide reduction reactions and anodic current production in microbial fuel cells (MFCs) ( 5 , 9 ). (pnas.org)
- Where does the electron transport chain take place? (reference.com)
- The chain passes high-energy electrons formed during glycolysis into oxygen-creating adenosine triphosphate (ATP) for energy. (reference.com)
- The third phase, electron transport, moves the high-energy electrons through a chain of redox reactions in the mitochondrial membrane to create ATP. (reference.com)
- Rotenone is in the class of electron transport inhibitors, which bind at some point on the transport chain, keeping electrons from moving. (reference.com)
- Photosynthetic electron transport chain of the thylakoid membrane. (thefullwiki.org)
- The electron transport chain is also called the ETC . An enzyme called ATP synthase catalyzes a reaction to generate ATP. (thefullwiki.org)
- The function of the electron transport chain is to produce this gradient [ 2 ] [ nb 2 ] . (thefullwiki.org)
- This is an electron transport chain. (thefullwiki.org)
- The transport chain often is likened to a series of magnets, each stronger than the last, which pull electrons from one weaker carrier and release it to the next stronger one. (cliffsnotes.com)
- Energy from the transport chain establishes a proton gradient across the inner membrane of the mitochondrion and supplies the energy for the embedded protein complexes-which also are proton pumps and sites of the chemiosmotic process. (cliffsnotes.com)
- The electron is the part that actually gets passed down the chain from carrier to carrier. (s-cool.co.uk)
- Explain how the electron transport chain (and ATP-synthase) works. (enotes.com)
- How does the electron transport chain (and ATP-synthase) work, including the inputs and final. (enotes.com)
- The flow of electrons through the electron transport chain is an exergonic process. (wikipedia.org)
- In the electron transport chain, the redox reactions are driven by the Gibbs free energy state of the components. (wikipedia.org)
- The complexes in the electron transport chain harvest the energy of the redox reactions that occur when transferring electrons from a low redox potential to a higher redox potential, creating an electrochemical gradient. (wikipedia.org)
- In photosynthetic eukaryotes, the electron transport chain is found on the thylakoid membrane. (wikipedia.org)
- Here, light energy drives the reduction of components of the electron transport chain and therefore causes subsequent synthesis of ATP. (wikipedia.org)
- colored green, blue and red) of each monomeric unit have a direct role in the passage of electrons in the respiratory chain. (proteopedia.org)
- The following images attempt to illustrate how the electron transport chain (ETC) creates a proton gradient that powers the synthesis of ATP. (nodak.edu)
- HskA showed a strong influence on the composition of the electron transport chain. (wiley.com)
- Model of the P. putida electron transport chain inferred from the genes present in strain KT2440 genome. (wiley.com)
- Today we will talk about a nuclear control of the electron transport chain gene expression. (hstalks.com)
- The talk outline will be a summary of an introduction, followed by a summary of the subunits involved in the electron transport chain, and the transcription of the electron transport chain subunits. (hstalks.com)
- There are five complexes that make up the electron transport chain, and these complexes are encoded by both nuclear and mitochondrial genomes. (hstalks.com)
- They go through the first special protein (the photosystem II protein) and down the electron transport chain. (asu.edu)
- Photosystem I and II don't align with the route electrons take through the transport chain because they weren't discovered in that order. (asu.edu)
- Later, photosystem II was discovered and found to be earlier in the electron transport chain. (asu.edu)
- When hydrogen ions move through the protein and down the electron transport chain, ATP is created. (asu.edu)
- Electrons from the NADPH and FADH 2 are transferred to O 2 via the electron transport chain generating the energy carrier ATP and oxidized NADP + and FAD + ( Siedow and Day, 2000 ). (plantphysiol.org)
- The mitochondrial electron transport chain (ETC) enables many metabolic processes, but why its inhibition suppresses cell proliferation is unclear. (nih.gov)
- NDUFA4 is a subunit of complex IV of the mammalian electron transport chain. (wikipathways.org)
- Mycothiazole, a polyketide metabolite isolated from the marine sponge Cacospongia mycofijiensis , is a potent inhibitor of metabolic activity and mitochondrial electron transport chain complex I in sensitive cells, but other cells are relatively insensitive to the drug. (mdpi.com)
- the enzyme may act as part of the mitochondrial electron transport chain by transferring electrons to ubiquinone and acting as an uncoupling mechanism susceptible to proton leak (Miwa et al. (thefreedictionary.com)
- This is a complex multi-step process that occurs along the electron transport chain , which serves as a "power line" through which chemical energy is released and transferred into ATP. (thefreedictionary.com)
- Some medications can directly affect electron transport chain complexes or damage electron transport chain components. (thefreedictionary.com)
- The flux through the electron transport chain is relevant to the aging process because it is related to the rate of production of ROS. (thefreedictionary.com)
- We do not fully understand the reasons behind these differences between the two photosystems, but they seem to be related to differences in the manner the antennas are coupled to the reaction centers, and also to characteristics and organization of the electron transport chain downhill of the charge separation at PSI. (thefreedictionary.com)
- The mitochondrial electron transport chain (7) consists of five enzyme complexes. (thefreedictionary.com)
- The electron transport chain is involved in mitochondrial energy production," says Johnson. (thefreedictionary.com)
- The Respiratory Electron-transport Chain (ETC) is a series of enzyme complexes embedded in the innermitochondrialmembrane, which oxidize NADH and QH2. (slideserve.com)
- The passage of electrons down the electron transport chain appears to provide the energy for the active transport of hydrogen ions across the membrane from the mitochondrial matrix. (jiskha.com)
- What role do high-energy electrons play in the electron transport chain? (jiskha.com)
- a. high energy electrons move through the electron transport chain. (jiskha.com)
- Provide electron to the electron transport chain in the form of NADH c. make ATP d. (jiskha.com)
- In the electron transport chain, electrons from FADH2 are eventually used to reduce O2 into H2O. (jiskha.com)
- The nonlinear lattice is modeled as a classical one-dimensional Morse chain and the dynamics of the electrons are considered in the tight-binding approximation. (ucm.es)
- Electron Transport Chain and O2 Debt and LA fermentation? (biology-online.org)
- which goes to the Electron transport chain. (biology-online.org)
Oxygen11
- Both the respiratory and photosynthetic electron transport chains are major sites of premature electron leakage to oxygen, thus being major sites of superoxide production and drivers of oxidative stress . (thefullwiki.org)
- But, if electrons were added directly to oxygen, the reaction probably would produce enough heat to damage the cells and result in too small an amount of captured energy to be a significant source for future energy needs. (cliffsnotes.com)
- Oxygen is the ultimate electron receiver, being reduced to water as a waste product, while helping to serve construct adenosine triphosphate by the transfer of electrons. (enotes.com)
- labeled IV), which uses the electrons and hydrogen ions to reduce molecular oxygen to water. (wikipedia.org)
- Here a series of reactions occurs in which electrons are transported to meet up with oxygen from respiration. (sciencephoto.com)
- While contained by the third complex, the electrons interact with oxygen and hydrogen ions. (nodak.edu)
- Electrons are finally donated to oxygen. (wiley.com)
- Besides maintenance of electron flux, AOXs can reduce the reactive oxygen species (ROS) levels in situations when Complexes III and IV are unable to function properly. (plantphysiol.org)
- In this biochemical reaction, electrons are passed along the cytochromes of a cell or mitochondrial membrane and are ultimately accepted by oxygen, producing water. (thefreedictionary.com)
- The oxygen evolution and Q A- to Q B(Q B-) electron transfer measured by flash-induced fluorescence decay remained similar in all samples studied. (lu.se)
- When oxygen accepts electrons, water is produced as a byproduct. (mhhe.com)
Hydrogen7
- The most abundant electron carrier, coenzyme Q (CoQ) , carries electrons and hydrogen atoms between the others. (cliffsnotes.com)
- Each hydrogen atom is split into its constituent H + (hydrogen ion) and electron. (s-cool.co.uk)
- The hydrogen loses its electron, becomes the aforementioned proton gradient (H+), while the NAD+ couples with another molecule, on the way to producing ATP. (enotes.com)
- This last electron, sorry the electron then gets past here to this last complex where again hydrogen ions are moved across the membrane and the used up energy electrons. (brightstorm.com)
- Electron donation to the first complex (blue) and hydrogen ion pumping are coupled. (nodak.edu)
- This means that when electrons are moved, hydrogen ions move too. (asu.edu)
- What is the purpose of transporting the transporting the hydrogen ions across the membrane? (jiskha.com)
FADH23
- As a result of the oxidation of NADH and FADH2, electrons are released. (sparknotes.com)
- More NADH and FADH2 carrying high energy electrons are sent off to the electron transport system. (brightstorm.com)
- And what they do is they take the high energy electrons that are being carried by NADH or FADH2 and they pass them one to the next which is why collectively it's called an electron transport system. (brightstorm.com)
High-energy electrons3
- The second phase, the citric acid cycle, creates high-energy electrons by passing the broken-down glucose through several chemical reactions. (reference.com)
- Now as I said it's the last step of aerobic respiration what it does it uses the high energy electrons that were generated by the cell doing glycolsis and the Krebs cycle putting them onto high energy electrons and then the electron transport system uses those high energy electrons to make some ATP. (brightstorm.com)
- Now the electron transport system is this last step here, so we began with glycolsis breaking apart the glucose forming pyruvate and spitting off some high energy electrons in the form, are being carried on the electron carrier NADH. (brightstorm.com)
Adenosine triphosphate1
- Oxidative respiration produces adenosine triphosphate through the mitochondrial electron transport system controlling the energy supply of plant cells. (plantphysiol.org)
Pathway1
- The functionality of chlororespiratory electron transfer pathway under iron restricted conditions is also discussed. (frontiersin.org)
Mitochondrial electron transport3
- The results indicate that SA is both an uncoupler and an inhibitor of mitochondrial electron transport and suggest that this underlies the induction of some genes by SA. (plantphysiol.org)
- Here we describe a mitochondrial pentatricopeptide repeat (PPR) domain protein, PPR40, which provides a signaling link between mitochondrial electron transport and regulation of stress and hormonal responses in Arabidopsis ( Arabidopsis thaliana ). (plantphysiol.org)
- Thus, under stress the mitochondrial electron transport relies on the functions of AOXs, which can bypass the blocked proton pumping Complex III ( Vanlerberghe and Ordog, 2002 ). (plantphysiol.org)
Extracellular electron transport5
- These results are not consistent with previously proposed redox-shuttling mechanisms but suggest that the flavin/OM c- Cyts interaction regulates the extent of extracellular electron transport coupled with intracellular metabolic activity. (pnas.org)
- Outside the cell, both Shewanella and Geobacter secrete nanometer scale diameter, micrometer scale long proteinaceous filaments, referred to as pili and microbial nanowires ( 7 ), that extend from their outer surfaces into the extracellular matrix (ECM) thought to be involved in extracellular electron transport processes, including cell-to-cell electron transfer ( 8 ) and reduction of insoluble oxidants ( 9 ). (pnas.org)
- An alanine was substituted for each of the five aromatic amino acids in the carboxyl terminus of PilA, the region in which G. sulfurreducens PilA differs most significantly from the PilAs of microorganisms incapable of long-range extracellular electron transport. (asm.org)
- The finding that a strain of G. sulfurreducens that produces pili with low conductivity is limited in these extracellular electron transport functions provides further insight into these environmentally significant processes. (asm.org)
- The mechanisms for long-range extracellular electron transport in Geobacter species are of interest because of the important role that Geobacter species play in the biogeochemistry of a diversity of anaerobic soils and sediments and in several bioenergy strategies. (asm.org)
Respiration1
- Electron transport is the last stage of cell respiration. (reference.com)
Protein complexes1
- One such essential process is electron transport, which powers all life forms by shuttling electrons between key protein complexes. (medicalnewstoday.com)
Atoms4
- Why Do Some Atoms Gain or Lose Electrons to Form Ions? (reference.com)
- Atoms gain or lose electrons based on their respective electron affinity. (reference.com)
- Many of the latter are cytochromes (proteins with an iron‐containing porphyrin ring attached) where the electron exchanges take place on the iron atoms. (cliffsnotes.com)
- We propose to use ultracold-fermionic atoms in optical lattices to quantum-simulate electronic transport in quantum-cascade-laser structures. (osapublishing.org)
Carrier7
- instead it is a mobile electron carrier and can float within the inner membrane, where it can transfer electrons from Complex I and Complex II to Complex III. (cliffsnotes.com)
- The electron carriers are at successively lower energy levels hence, as the electron moves on from one carrier to the next some energy is released. (s-cool.co.uk)
- Several compounds that prevent enzymatic reoxidation of plastoquinol in thylakoid membranes at the Qz site or withdraw electrons from this lipophilic electron carrier inhibited desaturation in the dark. (biomedsearch.com)
- The donated electrons are then passed to the first mobile carrier protein (pink). (nodak.edu)
- N- or B-doped carbon nanotubes (CNTs) uniformly dispersed in the active layer of P3HT/PCMB (poly (3-hexylthiophene/[6,6]-phenyl-C 61 -butyric acid methyl ester) bulk-heterojunction solar cells selectively enhance electron or hole transport and eventually help carrier collection. (wiley.com)
- Despite its potential for adoption in these applications, an understanding of its carrier transport properties is still lacking. (aps.org)
- 5. The cation requirement for equal inhibitory effect is parallel with the reciprocals of the transport affinities for the 'physiological K-carrier' (as taken from Conway & Duggan, 1958). (biochemj.org)
Carriers6
- R. Photosynthetic Electron Carriers. (worldcat.org)
- Such transport could in principle be described by means of Boltzmann transport equation (BTE) for charge carriers. (hindawi.com)
- The structures are electrically connected by lipid-soluble electron carriers and water-soluble electron carriers. (wikipedia.org)
- By analogy with other systems, this desaturation might be expected to involve electron carriers. (biomedsearch.com)
- Electrons flow from different electron donors to the quinone carriers of the cell membrane (UQ) and are then transferred either to the bc1 complex or to the Cyo or CIO terminal ubiquinol oxidases. (wiley.com)
- In this talk, I will review our recent theoretical and experimental efforts to establish the fundamental laws that govern the thermal transport in a variety of nanoscale systems in which the heat flow is dominated by different carriers: electrons, phonons, and photons. (cea.fr)
Reactions1
- However, it is not known how protein phosphorylation affects the partial electron transport reactions in PS II. (lu.se)
Membrane5
- For example, in the case of Shewanella , it is proposed that the CymA-MtrA-MtrC complex comprised of 3 multiheme c -type cytochromes totaling 24 hemes acts as a multistep conduit that conducts respired electrons originating in the cytoplasm from the inner membrane through the periplasm and outer membrane to the cell outer surface ( 4 ⇓ - 6 ). (pnas.org)
- Electron flow through Complex II transfers proton(s) through the membrane into the intermembrane space. (cliffsnotes.com)
- In chloroplasts, photosynthetic electron transport generates a proton gradient across the thylakoid membrane which then drives ATP synthesis via ATP synthase. (edu.au)
- The electrons must travel through special proteins stuck in the thylakoid membrane. (asu.edu)
- By moving step-by-step through these, electrons are moved in a specific direction across a membrane. (asu.edu)
Accepts electrons2
- Complex I and Complex II direct electrons to coenzyme Q. Complex I, also called NADH‐coenzyme Q reductase, accepts electrons from NADH. (cliffsnotes.com)
- Complex II, also known as succinate‐coenzyme Q reductase, accepts electrons from succinate formed during the TCA cycle. (cliffsnotes.com)
Proteins3
- Apparently, conformational changes in the proteins of Complex I also are involved in the mechanism of proton translocation during electron transport. (cliffsnotes.com)
- Genes required for nitrogen fixation can be considered as three functional modules encoding electron-transport components (ETCs), proteins required for metal cluster biosynthesis, and the 'core' nitrogenase apoenzyme, respectively. (jic.ac.uk)
- We are interested in using electron microscopy to solve the structure of mitochondrial transport proteins. (cam.ac.uk)
Phonons1
- Calculations considering the interaction of electrons with acoustic phonons provide a reasonable description of our experimental findings. (aps.org)
Photosystem3
Succinate Dehydrogenase1
- Succinate dehydrogenase, also known as succinate-CoQ reductase, receives electrons into the quinone pool from succinate and transfers them to to Q. Complex II has four subunits. (news-medical.net)
NADPH1
- The energized electrons are then used to make NADPH. (asu.edu)
Ubiquinone2
- PINK1 is mutated in Parkinson's disease (PD), and mutations cause mitochondrial defects that include inefficient electron transport between complex I and ubiquinone. (rupress.org)
- 1. Ubiquinone (Q)Q is a lipid soluble molecule that diffuses within the lipid bilayer, accepting electrons from Complex I and Complex II and passing them to Complex III. (slideserve.com)
Transfer8
- Extracellular redox-active compounds, flavins and other quinones, have been hypothesized to play a major role in the delivery of electrons from cellular metabolic systems to extracellular insoluble substrates by a diffusion-based shuttling two-electron-transfer mechanism. (pnas.org)
- can acquire energy by coupling intracellular oxidation of organic matter with extracellular electron transfer to an anode (an electrode poised at a metabolically oxidizing potential), forming a biofilm extending many cell lengths away from the anode surface. (pnas.org)
- Low-temperature electronic transport through macromolecules and characteristics of intramolecular electron transfer. (ebscohost.com)
- Long-distance electron transfer (ET) plays an important part in many biological processes. (ebscohost.com)
- In describing the dynamics of electron transfer or charge transport, the reorganization energy and the spectral density function describe the influence of nuclei motion to the transporting electron. (rsc.org)
- IMPORTANCE Extracellular electron transfer by Geobacter species plays an important role in the biogeochemistry of soils and sediments and has a number of bioenergy applications. (asm.org)
- We study in detail the role of thermal factors on the electron transfer. (ucm.es)
- We focus on the mutual drag between electron and phonon transport as a result of 'momentum' transfer, which happens only when there are at least two phonon degrees of freedom. (dtu.dk)
Inhibitors3
- Interference of electron transport inhibitors with desaturation of monogalactosyl diacylglycerol in intact chloroplasts. (biomedsearch.com)
- The effects of electron transport inhibitors on chloroplast lipid-linked desaturation were therefore investigated. (biomedsearch.com)
- Inhibitors of cyclic electron transport interfered with desaturation only at rather high concentrations or not at all. (biomedsearch.com)
Coenzyme3
- It transfers electrons from NADH to coenzyme Q10. (news-medical.net)
- The electrons are then transferred through iron-sulfur clusters to coenzyme Q10. (news-medical.net)
- Coenzyme Q is capable of accepting either one or two electrons to form either a semiquinone or hydroquinone form. (cliffsnotes.com)
Molecule2
- VSEPR, or valence shell electron pair repulsion, is a model used to predict the geometry of a molecule. (reference.com)
- In bacteria, the only electron chauffeur is a molecule called menaquinone (MK) that has species-specific variations in its structure. (medicalnewstoday.com)
Occurs3
- misc{etde_475728, title = {Electron thermal transport in tokamak plasmas} author = {Konings, J A} abstractNote = {The process of fusion of small nuclei thereby releasing energy, as it occurs continuously in the sun, is essential for the existence of mankind. (osti.gov)
- It has been proposed that long-range electron transport in such biofilms occurs through a network of bound redox cofactors, thought to involve extracellular matrix c -type cytochromes, as occurs for polymers containing discrete redox moieties. (pnas.org)
- For all materials, we find that electron velocity overshoot only occurs when the electric field is increased to a value above a certain critical field, unique to each material. (scirp.org)
Flavin2
- The reaction begins when NADH binds to Complex I, transferring two electrons to the flavin mononucleotide (FMN) prosthetic group, resulting in the formation of FMNH2. (news-medical.net)
- Importantly, this flavin/OM c- Cyts interaction was found to facilitate a one-electron redox reaction via a semiquinone, resulting in a 10 3 - to 10 5 -fold faster reaction rate than that of free flavin. (pnas.org)
Reduction4
- A pronounced semiconductor-to-metal transition is observed under 254 nm UV irradiation, as a consequence of the reduction of electron mobility arising from the drastically enhanced Coulomb interactions. (upmc.fr)
- These features are consistent with the fact that the modulation of the intragap states results in reduction of interfacial recombination as well as the improved charge selectivity and electron transport properties of the ETLs. (diva-portal.org)
- Clear evidence is reported for the first time of a rapid localized reduction of core electron energy diffusivity during the formation of an electron internal-transport barrier. (epfl.ch)
- This crucial observation, and the correlation of the transition with the time and location of the magnetic shear reversal, lend support to models attributing the reduced transport to the local properties of a zero-shear region, in contrast to models predicting a gradual reduction due to a weak or negative shear. (epfl.ch)
Measurements9
- Here, we report measurements of electron transport in actively respiring Geobacter sulfurreducens wild type biofilms using interdigitated microelectrode arrays. (pnas.org)
- Measurements when one electrode is used as an anode and the other electrode is used to monitor redox status of the biofilm 15 μm away indicate the presence of an intrabiofilm redox gradient, in which the concentration of electrons residing within the proposed redox cofactor network is higher farther from the anode surface. (pnas.org)
- Comparison with gate measurements, when one electrode is used as an electron source and the other electrode is used as an electron drain, suggests that there are multiple types of redox cofactors in Geobacter biofilms spanning a range in oxidation potential that can engage in electron transport. (pnas.org)
- Ex situ conductivity measurements of individual filaments of Shewanella oneidensis MR-1 confirm their lengthwise conductivity when isolated from cells under specific conditions ( 10 , 11 ), and subsequent modeling of their current-voltage characteristics is consistent with multistep electron hopping involving redox cofactors proposed to be associated with these filaments ( 12 ⇓ - 14 ). (pnas.org)
- Recently, fractional-quantized Hall effect was observed in suspended graphene (SG), a free-standing monolayer of carbon, where it was found to persist up to T=10 K. The best results in those experiments were obtained on micron-size flakes, on which only two-terminal transport measurements could be performed. (mit.edu)
- We present low-temperature electron transport measurements of individual phenyleneâ€"ethynylene molecular wires, connected to nanometer-spaced gold electrodes. (ebscohost.com)
- We report on nonlinear transport measurements in a two-dimensional electron gas hosted in GaAs/AlGaAs heterostructures. (aps.org)
- Readers can therefore obtain a balancedview of charge and exciton transport, covering characterization techniques such as spectroscopy and current measurements together with quantitative models. (diva-portal.org)
- In this study, a combination of thermoluminescence (TL), chlorophyll fluorescence, and P700 absorbance measurements have been used to elucidate the effects of iron deficiency in the photosynthetic electron transport of the marine diatom P. tricornutum . (frontiersin.org)
Long-range electron transport2
- It has been proposed that Geobacter sulfurreducens requires conductive pili for long-range electron transport to Fe(III) oxides and for high-density current production in microbial fuel cells. (asm.org)
- These results demonstrate that the pili of G. sulfurreducens must be conductive in order for the cells to be effective in extracellular long-range electron transport. (asm.org)
Moves1
- The E(k) relation describes how the particle moves inside the device, in addition to depicting useful information necessary for transport such as the density of states (DOS) and the particle velocity. (wikipedia.org)
Proton gradient1
- Each time electrons are passed, there is the creation of a proton gradient (H+) that is available to create a thermodynamic potential to do mechanical work. (enotes.com)
Cofactors4
- The magnitude of the redox gradient seems to correlate with current, which is consistent with electron transport from cells in the biofilm to the anode, where electrons effectively diffuse from areas of high to low concentration, hopping between redox cofactors. (pnas.org)
- The majority of these redox cofactors, however, seem to have oxidation potentials too negative to be involved in electron transport when acetate is the electron source. (pnas.org)
- It is widely accepted that electron transport can occur over molecular-scale distances in biological systems by electron hopping among a small number of immobilized redox cofactors ( 1 , 2 ). (pnas.org)
- There is growing awareness, however, of the possibility of electron transport over length scales much longer than previously thought possible in biological systems by using immobilized redox cofactors organized into electron transport conduits. (pnas.org)
Chains3
- While most ATP is produced using electron transport chains, some simpler organisms produce ATP through fermentation. (reference.com)
- Electron transport chains capture energy in the form of a transmembrane electrochemical potential gradient. (thefullwiki.org)
- In most organisms, however, the majority of ATP is generated by electron transport chains. (thefullwiki.org)
Beam lithography2
- Since device fabrication facilities were not available before, an electron beam lithography (EBL) system has been installed. (europa.eu)
- As HgTe will degrade or evaporate at normal baking temperatures for electron beam lithography (EBL) resists, an alternative method was developed. (ebscohost.com)
Chloroplasts3
- The effect of dimethyl sulphoxide on electron transport in chloroplasts. (biomedsearch.com)
- It has been found that concentrations of DMSO up to 20% (v/v) do not inhibit electron transport in freshly isolated chloroplasts, but that higher concentrations start to cause inhibition. (biomedsearch.com)
- However, in chloroplasts that have been aged for 8 to 24 hours by storage at 4 degrees C, the addition of DMSO at concentrations up to 20% causes stimulation of electron transport. (biomedsearch.com)