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Artykuły w czasopismach na temat „Membrane d’échangeuse de protons”

Autor: Grafiati

Data publikacji: 19 października 2024

Data aktualizacji: 31 lipca 2025

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1

Sokolov, Valerij S., Vsevolod Yu Tashkin, Darya D. Zykova, Yulia V. Kharitonova, Timur R. Galimzyanov, and Oleg V. Batishchev. "Electrostatic Potentials Caused by the Release of Protons from Photoactivated Compound Sodium 2-Methoxy-5-nitrophenyl Sulfate at the Surface of Bilayer Lipid Membrane." Membranes 13, no. 8 (2023): 722. http://dx.doi.org/10.3390/membranes13080722.

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Lateral transport and release of protons at the water–membrane interface play crucial roles in cell bioenergetics. Therefore, versatile techniques need to be developed for investigating as well as clarifying the main features of these processes at the molecular level. Here, we experimentally measured the kinetics of binding of protons released from the photoactivated compound sodium 2-methoxy-5-nitrophenyl sulfate (MNPS) at the surface of a bilayer lipid membrane (BLM). We developed a theoretical model of this process describing the damage of MNPS coupled with the release of the protons at the

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2

Ababneh, Omar, Abdallah Barjas Qaswal, Ahmad Alelaumi, et al. "Proton Quantum Tunneling: Influence and Relevance to Acidosis-Induced Cardiac Arrhythmias/Cardiac Arrest." Pathophysiology 28, no. 3 (2021): 400–436. http://dx.doi.org/10.3390/pathophysiology28030027.

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Acidosis and its associated pathologies predispose patients to develop cardiac arrhythmias and even cardiac arrest. These arrhythmias are assumed to be the result of membrane depolarization, however, the exact mechanism of depolarization during acidosis is not well defined. In our study, the model of quantum tunneling of protons is used to explain the membrane depolarization that occurs during acidosis. It is found that protons can tunnel through closed activation and inactivation gates of voltage-gated sodium channels Nav1.5 that are present in the membrane of cardiac cells. The quantum tunne

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3

Weichselbaum, Ewald, and Peter Pohl. "Protons at the membrane water interface." Biochimica et Biophysica Acta (BBA) - Bioenergetics 1859 (September 2018): e117. http://dx.doi.org/10.1016/j.bbabio.2018.09.346.

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Rayabharam, Archith, and N. R. Aluru. "Quantum water desalination: Water generation through separate pathways for protons and hydroxide ions in membranes." Journal of Applied Physics 132, no. 19 (2022): 194302. http://dx.doi.org/10.1063/5.0122324.

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Much of the water desalination strategies has focused on designing pores and membranes that transport water and reject ions and other molecules at a high rate. In this paper, we discuss an approach where protons (H+) and hydroxide (OH−) ions are transported via different mechanisms through a porous membrane, and subsequently, once they have been transported through the membrane, they recombine to generate water. 2D materials such as graphene and MoS2 have generated significant interest for applications such as desalination. Here, we explore the applicability of one such 2D material—a cubic Ti2

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Farahani, Ramin M. "An Addendum to the Chemiosmotic Theory of Mitochondrial Activity: The Role of RNA as a Proton Sink." Biomolecules 15, no. 1 (2025): 87. https://doi.org/10.3390/biom15010087.

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Mitochondrial ATP synthesis is driven by harnessing the electrochemical gradient of protons (proton motive force) across the mitochondrial inner membrane via the process of chemiosmosis. While there is consensus that the proton gradient is generated by components of the electron transport chain, the mechanism by which protons are supplied to ATP synthase remains controversial. As opposed to a global coupling model whereby protons diffuse into the intermembrane space, a localised coupling model predicts that protons remain closely associated with the lipid membrane prior to interaction with ATP

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6

Abdallat, Mahmoud, Abdallah Barjas Qaswal, Majed Eftaiha, et al. "A mathematical modeling of the mitochondrial proton leak via quantum tunneling." AIMS Biophysics 11, no. 2 (2024): 189–233. http://dx.doi.org/10.3934/biophy.2024012.

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<abstract> <p>The mitochondrion is a vital intracellular organelle that is responsible for ATP production. It utilizes both the concentration gradient and the electrical potential of the inner mitochondrial membrane to drive the flow of protons from the intermembrane space to the matrix to generate ATP via ATP-synthase. However, the proton leak flow, which is mediated via the inner mitochondrial membrane and uncoupling proteins, can reduce the efficiency of ATP production. Protons can exhibit a quantum behavior within biological systems. However, the investigation of the quantum be

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7

Keller, David, Seema Singh, Paola Turina, Roderick Capaldi, and Carlos Bustamante. "Structure of ATP synthase by SFM and single-particle image analysis." Proceedings, annual meeting, Electron Microscopy Society of America 53 (August 13, 1995): 722–23. http://dx.doi.org/10.1017/s0424820100139986.

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F1Fo ATP synthases are the proteins responsible for the synthesis of ATP in oxidative phosphorylation, and are present in some form in all aerobic organisms, both prokaryotic and eukaryotic. They use the energy stored in a transmembrane proton gradient (which is generated by other members of the oxidative phosphorylation pathway) to synthesize ATP from ADP and Pi or, working in reverse, to pump protons across the membrane using the energy of ATP hydrolysis. The full protein has two sectors, F1 and Fo. F1 is normally bound to Fo (which is membrane integrated), but is water soluble when dissocia

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8

Bramhall, John. "Conductance routes for protons across membrane barriers." Biochemistry 26, no. 10 (1987): 2848–55. http://dx.doi.org/10.1021/bi00384a028.

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M., Ambaga, Tumen-Ulzii A., and Buyantushig T. "THE BUFFERING CAPACITY OF ERYTHROCYTE MEMBRANE SURROUNDINGS IN RELATION TO FREE PROTONS INSIGHTOF NEW ELUCIDATION OF EIGTH AND NINTH STAGES OF THE MEMBRANE REDOXY POTENTIAL THREE STATE DEPENDENT 9 STEPPED FULL CYCLE OF PROTON CONDUCTANCE IN THE HUMAN BODY." International Journal of Advanced Research 10, no. 11 (2022): 29–33. http://dx.doi.org/10.21474/ijar01/15638.

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It was became clear that the flow-fate of all many many protons,generated in mitochondria of 50-80 trillion cells (now by us mitochondria flow of protons named as 1-7 stages of proton conductance) have been needed another special structures - another system needs to soak up the extra H+ activity generated as a result of process conducted in the 1-7 stages of proton conductance in order for true buffering to occur, that system consists of intracellular proteins, of which haemoglobin is the key player, concretely speaking,one of these are the erythrocyte membrane surroundings for packaging of pr

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10

Vidilaseris, Keni, Juho Kellosalo, and Adrian Goldman. "A high-throughput method for orthophosphate determination of thermostable membrane-bound pyrophosphatase activity." Analytical Methods 10, no. 6 (2018): 646–51. http://dx.doi.org/10.1039/c7ay02558k.

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Membrane-bound pyrophosphatases (mPPases) are homodimeric integral membrane proteins that hydrolyse pyrophosphate into orthophosphates coupled to the active transport of protons or sodium ions across membranes.

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11

Kluka, Ľubomír, Ernest Šturdík, Štefan Baláž, et al. "Membrane proton transport mediated by phenylhydrazonopropanedinitriles." Collection of Czechoslovak Chemical Communications 53, no. 1 (1988): 186–97. http://dx.doi.org/10.1135/cccc19880186.

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Some fundamental physicochemical characteristics as stability in solutions, solubility in various solvents and association constants describing equilibria with protons and potassium ions in aqueous solutions were determined for phenylhydrazonopropanedinitriles (PHPD). The effect of pH and sodium, potassium, calcium, and magnesium cations on the distribution of PHPD were examined in a two-compartment system 1-octanol-water. The transmembrane transfer of protons by PHPD causing a disturbance of the pH-gradient was verified in vitro using a model three-compartment system water-octanol-water, imit

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12

Ardalan, Afshan, Matthew D. Smith, and Masoud Jelokhani-Niaraki. "Uncoupling Proteins and Regulated Proton Leak in Mitochondria." International Journal of Molecular Sciences 23, no. 3 (2022): 1528. http://dx.doi.org/10.3390/ijms23031528.

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Higher concentration of protons in the mitochondrial intermembrane space compared to the matrix results in an electrochemical potential causing the back flux of protons to the matrix. This proton transport can take place through ATP synthase complex (leading to formation of ATP) or can occur via proton transporters of the mitochondrial carrier superfamily and/or membrane lipids. Some mitochondrial proton transporters, such as uncoupling proteins (UCPs), transport protons as their general regulating function; while others are symporters or antiporters, which use the proton gradient as a driving

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13

Chistyakov, V. A., Yu O. Smirnova, and I. Alperovich. "Feasibility of the C60 Fullerene Antioxidant Properties: Study with Density Functional Theory Computer Modeling." International Journal of Mathematics and Computers in Simulation 15 (November 27, 2021): 107–9. http://dx.doi.org/10.46300/9102.2021.15.20.

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Fullerene C60 compound was recently found to be a potent anti-oxidant, which may be envisioned as a result of alteration of the inner mitohondria membrane electric potential with protons transport boosted by fullerenes. Here we briefly report on the theoretical test of the very possibility of protons to pass through the surface of C60 fullerene to become confined within latter thus possibly decreasing the transmembrane electric field gradient when fullerene crosses the mitochondria membrane. Quantumchemical calculations within Density Functional Theory are employed as a means of checking descr

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14

Brzezinski, Peter, Joachim Reimann, and Pia Ädelroth. "Molecular architecture of the proton diode of cytochrome c oxidase." Biochemical Society Transactions 36, no. 6 (2008): 1169–74. http://dx.doi.org/10.1042/bst0361169.

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CytcO (cytochrome c oxidase) is a membrane-bound multisubunit protein which catalyses the reduction of O2 to H2O. The reaction is arranged topographically so that the electrons and protons are taken from opposite sides of the membrane and, in addition, it is also linked to proton pumping across the membrane. Thus the CytcO moves an equivalent of two positive charges across the membrane per electron transferred to O2. Proton transfer through CytcO must be controlled by the protein to prevent leaks, which would dissipate the proton electrochemical gradient that is maintained across the membrane.

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15

Frank, Pinar, Bernhard Siebenhofer, Theresa Hanzer, et al. "Proteo-lipobeads for the oriented encapsulation of membrane proteins." Soft Matter 11, no. 15 (2015): 2906–8. http://dx.doi.org/10.1039/c4sm02646b.

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Porter, R. K., and M. D. Brand. "Mitochondrial proton conductance and H+/0 ratio are independent of electron transport rate in isolated hepatocytes." Biochemical Journal 310, no. 2 (1995): 379–82. http://dx.doi.org/10.1042/bj3100379.

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In this paper we examine the non-linearity of the relationship between the proton electrochemical gradient across the mitochondrial inner membrane (delta p) and oxygen consumption of non-phosphorylating mitochondria in situ in hepatocytes. Models proposing to explain the non-linear relationship were tested experimentally. It was shown that the mitochondrial proton conductance and the number of protons pumped to the cytosolic side of the mitochondrial inner membrane by the electron transport complexes per oxygen atom consumed (H+/O ratio) are independent of electron transport rate in mitochondr

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17

DeCoursey, Thomas E. "Voltage and pH sensing by the voltage-gated proton channel, H V 1." Journal of The Royal Society Interface 15, no. 141 (2018): 20180108. http://dx.doi.org/10.1098/rsif.2018.0108.

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Voltage-gated proton channels are unique ion channels, membrane proteins that allow protons but no other ions to cross cell membranes. They are found in diverse species, from unicellular marine life to humans. In all cells, their function requires that they open and conduct current only under certain conditions, typically when the electrochemical gradient for protons is outwards. Consequently, these proteins behave like rectifiers, conducting protons out of cells. Their activity has electrical consequences and also changes the pH on both sides of the membrane. Here we summarize what is known a

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18

Rayabharam, Archith, and N. R. Aluru. "Interstitial proton transport through defective MXenes." Applied Physics Letters 120, no. 21 (2022): 211601. http://dx.doi.org/10.1063/5.0098709.

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Proton transport across nanometer-thick membranes in an aqueous medium is important for applications in energy and molecular sieving. Recently, Hu et al. [Nature 516(7530), 227–230 (2014)] experimentally demonstrated proton tunneling through 2D materials like graphene and hexagonal boron nitride, opening up a wide range of applications in hydrogen-based technologies such as fuel cells. Here, we demonstrate proton transport in an aqueous medium across a 2D cubic Ti2C membrane, a representative defective MXene, from ab initio molecular dynamics simulations. We observe bidirectional translocation

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19

Pasternak, C. A., C. L. Bashford, and G. Menestrina. "Mechanisms of attack and defence at the cell surface: The use of phospholipid bilayers as models for cell membrane." Bioscience Reports 9, no. 4 (1989): 503–7. http://dx.doi.org/10.1007/bf01117054.

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Electrical conductivity across phospholipid bilayers induced by various cytotoxic proteins has been used to analyse the damaging action of such proteins on cells; the protective effect of divalent cations and protons against such attack has also been investigated. The predominant effect of divalent cations and protons is to promote the closed state of membrane pores, i.e. to “gate” protein-induced lesions.

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Rahmawati, Sitti, Cynthia Linaya Radiman, and Muhamad Abdulkadir Martoprawiro. "Ab Initio Study of Proton Transfer and Hydration in Phosphorylated Nata de Coco." Indonesian Journal of Chemistry 17, no. 3 (2017): 523. http://dx.doi.org/10.22146/ijc.24895.

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This research aims to calculate energetics parameters, hydrogen bonding, characteristics local hydration, and proton transfer in phosphorylated nata de coco (NDCF) membrane using ab initio method. The minimum energy structure of NDCF membranes and the addition of n water molecules (n = 1-10) determined at the B3LYP/6-311G** level indicates that proton dissociation requires a minimum of four water molecules. Dissociated protons stabilize with the formation of (hydronium, Zundel, Eigen) ions. Calculation of the interaction energy with n water molecules indicates an increasingly negative change i

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21

JUNGE, WOLFGANG. "Protons, the Thylakoid Membrane, and the Chloroplast ATP Synthase." Annals of the New York Academy of Sciences 574, no. 1 Bicarbonate, (1989): 268–86. http://dx.doi.org/10.1111/j.1749-6632.1989.tb25164.x.

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Tan, Susie S. S., Peter C. Hauser, Nikolas A. Chaniotakis, Gabriela Suter, and Wilhelm Simon. "Anion-Selective Optical Sensors Based on a Coextraction of Anion-Proton Pairs into a Solvent-Polymeric Membrane." CHIMIA 43, no. 9 (1989): 257. https://doi.org/10.2533/chimia.1989.257.

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The design of optical sensing devices for anions based on the coextraction of anions and protons into a PVC membrane is described. The extraction is controlled by the lipophilicity of the anions, while the coextracted protons in conjunction with a hydrogen ion selective chromoionophore provide the optical signal transduction. The absorbance of the membrane at a fixed pH of the aqueous sample solution and at constant anion concentrations is related to the hydration energy (Hofmeister series) of the anions. Calibration curves, response times, and reproducibilities of such sensor systems are pres

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Shi, Le, Ruggero Rossi, Moon Son, et al. "Using reverse osmosis membranes to control ion transport during water electrolysis." Energy & Environmental Science 13, no. 9 (2020): 3138–48. http://dx.doi.org/10.1039/d0ee02173c.

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A relatively inexpensive commercially available RO membrane was shown to be useful for direct seawater H<sub>2</sub> generation as the membrane can selectively transport protons and hydroxide ions over other salt ions, and keep the inert anolyte contained to avoid chlorine gas evolution.

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Lande, M. B., N. A. Priver, and M. L. Zeidel. "Determinants of apical membrane permeabilities of barrier epithelia." American Journal of Physiology-Cell Physiology 267, no. 2 (1994): C367—C374. http://dx.doi.org/10.1152/ajpcell.1994.267.2.c367.

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Renal collecting duct and thick ascending limb, as well as stomach, exhibit strikingly low permeabilities to water and solutes. However, the apical membrane characteristics responsible for these unique permeabilities remain unknown. While the lipid composition of artificial membranes governs membrane permeability, exoplasmic and cytoplasmic leaflets of biological apical membranes exhibit striking asymmetries in lipid composition. This asymmetry, as well as the presence of membrane proteins, may be critical to barrier function. To determine the role of bulk lipid composition in apical membrane

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Junoh, Hazlina, Juhana Jaafar, Nik Abdul Hadi Md Nordin, et al. "Performance of Polymer Electrolyte Membrane for Direct Methanol Fuel Cell Application: Perspective on Morphological Structure." Membranes 10, no. 3 (2020): 34. http://dx.doi.org/10.3390/membranes10030034.

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Membrane morphology plays a great role in determining the performance of polymer electrolyte membranes (PEMs), especially for direct methanol fuel cell (DMFC) applications. Membrane morphology can be divided into two types, which are dense and porous structures. Membrane fabrication methods have different configurations, including dense, thin and thick, layered, sandwiched and pore-filling membranes. All these types of membranes possess the same densely packed structural morphology, which limits the transportation of protons, even at a low methanol crossover. This paper summarizes our work on

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Hill, Warren G., Eyad Almasri, W. Giovanni Ruiz, Gerard Apodaca, and Mark L. Zeidel. "Water and solute permeability of rat lung caveolae: high permeabilities explained by acyl chain unsaturation." American Journal of Physiology-Cell Physiology 289, no. 1 (2005): C33—C41. http://dx.doi.org/10.1152/ajpcell.00046.2005.

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Caveolae are invaginated membrane structures with high levels of cholesterol, sphingomyelin, and caveolin protein that are predicted to exist as liquid-ordered domains with low water permeability. We isolated a caveolae-enriched membrane fraction without detergents from rat lung and characterized its permeability properties to nonelectrolytes and protons. Membrane permeability to water was 2.85 ± 0.41 × 10−3 cm/s, a value 5–10 times higher than expected based on comparisons with other cholesterol and sphingolipid-enriched membranes. Permeabilities to urea, ammonia, and protons were measured an

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Negrete, H. O., J. P. Lavelle, J. Berg, S. A. Lewis, and M. L. Zeidel. "Permeability properties of the intact mammalian bladder epithelium." American Journal of Physiology-Renal Physiology 271, no. 4 (1996): F886—F894. http://dx.doi.org/10.1152/ajprenal.1996.271.4.f886.

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Because the mammalian bladder must store urine of composition which differs markedly from that of plasma for prolonged periods, the bladder permeability barrier must maintain extremely low permeabilities to substances which normally cross membranes relatively rapidly, such as water, protons, and small nonelectrolytes like urea and ammonia. In the present studies, permeabilities of the apical membrane of dissected rabbit bladder epithelium to water, urea, ammonia, and protons were measured in Ussing chambers and averaged (in cm/s) for water, 5.15 +/- 0.43 x 10(-5); for urea, 4.51 +/- 0.67 x 10(

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Qi, Han, Zhongwu Li, Yi Tao, et al. "Fabrication of sub-nanometer pores on graphene membrane for ion selective transport." Nanoscale 10, no. 11 (2018): 5350–57. http://dx.doi.org/10.1039/c8nr00050f.

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Kaur, Divya, Xiuhong Cai, Umesh Khaniya, et al. "Tracing the Pathways of Waters and Protons in Photosystem II and Cytochrome c Oxidase." Inorganics 7, no. 2 (2019): 14. http://dx.doi.org/10.3390/inorganics7020014.

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Photosystem II (PSII) uses water as the terminal electron donor, producing oxygen in the Mn4CaO5 oxygen evolving complex (OEC), while cytochrome c oxidase (CcO) reduces O2 to water in its heme–Cu binuclear center (BNC). Each protein is oriented in the membrane to add to the proton gradient. The OEC, which releases protons, is located near the P-side (positive, at low-pH) of the membrane. In contrast, the BNC is in the middle of CcO, so the protons needed for O2 reduction must be transferred from the N-side (negative, at high pH). In addition, CcO pumps protons from N- to P-side, coupled to the

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Lanzrein, Markus, Nicole Käsermann, and Christoph Kempf. "Changes in membrane permeability during semliki forest virus induced cell fusion." Bioscience Reports 12, no. 3 (1992): 221–36. http://dx.doi.org/10.1007/bf01121792.

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The infection of Aedes albopictus cells by Semliki Forest virus (SFV) is a non lytic event. Exposure of infected cells to mildly acidic pH (<6.2) leads to syncytium formation. This polykaryon formation is accompanied by an influex of protons into the cells (Kempf et al. Biosci. Rep. 7, 761–769, 1987). We have further investigated this permeability change using various fluorescent or radiolabeled compounds. A significant, pH dependent increase of the membrane permeability to low molecular weight compounds (Mr<1000) was observed when infected cells were exposed to a pH<6.2. The pH depen

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Khorana, H. G. "Bacteriorhodopsin, a membrane protein that uses light to translocate protons." Journal of Biological Chemistry 263, no. 16 (1988): 7439–42. http://dx.doi.org/10.1016/s0021-9258(18)68514-x.

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BRISKIN, DONALD P., and JOHN B. HANSON. "How Does the Plant Plasma Membrane H+-ATPase Pump Protons?" Journal of Experimental Botany 43, no. 3 (1992): 269–89. http://dx.doi.org/10.1093/jxb/43.3.269.

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Luoto, Heidi H., Erika Nordbo, Alexander A. Baykov, Reijo Lahti, and Anssi M. Malinen. "Membrane Na+-pyrophosphatases Can Transport Protons at Low Sodium Concentrations." Journal of Biological Chemistry 288, no. 49 (2013): 35489–99. http://dx.doi.org/10.1074/jbc.m113.510909.

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Nesterov, Semen V., Lev S. Yaguzhinsky, Raif G. Vasilov, Vasiliy N. Kadantsev, and Alexey N. Goltsov. "Contribution of the Collective Excitations to the Coupled Proton and Energy Transport along Mitochondrial Cristae Membrane in Oxidative Phosphorylation System." Entropy 24, no. 12 (2022): 1813. http://dx.doi.org/10.3390/e24121813.

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The results of many experimental and theoretical works indicate that after transport of protons across the mitochondrial inner membrane (MIM) in the oxidative phosphorylation (OXPHOS) system, they are retained on the membrane–water interface in nonequilibrium state with free energy excess due to low proton surface-to-bulk release. This well-established phenomenon suggests that proton trapping on the membrane interface ensures vectorial lateral transport of protons from proton pumps to ATP synthases (proton acceptors). Despite the key role of the proton transport in bioenergetics, the molecular

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Movellan, Kumar Tekwani, Eszter E. Najbauer, Supriya Pratihar, et al. "Alpha protons as NMR probes in deuterated proteins." Journal of Biomolecular NMR 73, no. 1-2 (2019): 81–91. http://dx.doi.org/10.1007/s10858-019-00230-y.

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Abstract We describe a new labeling method that allows for full protonation at the backbone Hα position, maintaining protein side chains with a high level of deuteration. We refer to the method as alpha proton exchange by transamination (α-PET) since it relies on transaminase activity demonstrated here using Escherichia coli expression. We show that α-PET labeling is particularly useful in improving structural characterization of solid proteins by introduction of an additional proton reporter, while eliminating many strong dipolar couplings. The approach benefits from the high sensitivity asso

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Vergara, Eva, Gonzalo Neira, Carolina González, Diego Cortez, Mark Dopson, and David S. Holmes. "Evolution of Predicted Acid Resistance Mechanisms in the Extremely Acidophilic Leptospirillum Genus." Genes 11, no. 4 (2020): 389. http://dx.doi.org/10.3390/genes11040389.

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Organisms that thrive in extremely acidic environments (≤pH 3.5) are of widespread importance in industrial applications, environmental issues, and evolutionary studies. Leptospirillum spp. constitute the only extremely acidophilic microbes in the phylogenetically deep-rooted bacterial phylum Nitrospirae. Leptospirilli are Gram-negative, obligatory chemolithoautotrophic, aerobic, ferrous iron oxidizers. This paper predicts genes that Leptospirilli use to survive at low pH and infers their evolutionary trajectory. Phylogenetic and other bioinformatic approaches suggest that these genes can be c

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Muljani, S., and A. Wulanawati. "Microbial Fuel Cell Based Polystyrene Sulfonated Membrane as Proton Exchange Membrane." ALCHEMY Jurnal Penelitian Kimia 12, no. 2 (2016): 155. http://dx.doi.org/10.20961/alchemy.12.2.1818.155-166.

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<p>Microbial fuel cell (MFC) represents a major bioelectrochemical system that converts biomass spontaneously into electricity through the activity of microorganisms. The MFC consists of anode and cathode compartments. Microorganisms in MFC liberate electrons while the electron donor is consumed. The produced electron is transmitted to the anode surface, but the generated protons must pass through the proton exchange membrane (PEM) to reach the cathode compartment. PEM, as a key factor, affects electricity generation in MFCs. The study attempted to investigate if the sulfonated polystyre

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Muljani, S., and A. Wulanawati. "Microbial Fuel Cell Based Polystyrene Sulfonated Membrane as Proton Exchange Membrane." ALCHEMY Jurnal Penelitian Kimia 12, no. 2 (2016): 155. http://dx.doi.org/10.20961/alchemy.v12i2.1818.

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<p>Microbial fuel cell (MFC) represents a major bioelectrochemical system that converts biomass spontaneously into electricity through the activity of microorganisms. The MFC consists of anode and cathode compartments. Microorganisms in MFC liberate electrons while the electron donor is consumed. The produced electron is transmitted to the anode surface, but the generated protons must pass through the proton exchange membrane (PEM) to reach the cathode compartment. PEM, as a key factor, affects electricity generation in MFCs. The study attempted to investigate if the sulfonated polystyre

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Kageyama, Miho, Beste Balci, Shotaro Danjo, Kimiyo Nakamichi, and Motoaki Kawase. "Hydrogen and Oxygen Permeability through PEFC Membrane and Membrane Electrode Assembly." ECS Transactions 112, no. 4 (2023): 291–303. http://dx.doi.org/10.1149/11204.0291ecst.

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A proton exchange membrane (PEM) is an important component of a polymer electrolyte fuel cell (PEFC) from the viewpoint of proton transport. Only protons are desired to be transported through a membrane, but the feed gases also permeate. The permeation of the feed gas through a membrane affects the PEFC performance. Temperature and relative humidity dependencies of the hydrogen and oxygen permeability through a perfluorosulfonic acid (PFSA) membrane were measured. By considering that a membrane consists of three layers, i.e. a bulk layer sandwiched between skin layers, the transport properties

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Fliegel, Larry. "Structural and Functional Changes in the Na+/H+ Exchanger Isoform 1, Induced by Erk1/2 Phosphorylation." International Journal of Molecular Sciences 20, no. 10 (2019): 2378. http://dx.doi.org/10.3390/ijms20102378.

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The human Na+/H+ exchanger isoform 1 (NHE1) is a plasma membrane transport protein that plays an important role in pH regulation in mammalian cells. Because of the generation of protons by intermediary metabolism as well as the negative membrane potential, protons accumulate within the cytosol. Extracellular signal-regulated kinase (ERK)-mediated regulation of NHE1 is important in several human pathologies including in the myocardium in heart disease, as well as in breast cancer as a trigger for growth and metastasis. NHE1 has a N-terminal, a 500 amino acid membrane domain, and a C-terminal 31

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Weichselbaum, Ewald, Timur Galimzyanov, Oleg V. Batishchev, Sergey A. Akimov, and Peter Pohl. "Proton Migration on Top of Charged Membranes." Biomolecules 13, no. 2 (2023): 352. http://dx.doi.org/10.3390/biom13020352.

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Proton relay between interfacial water molecules allows rapid two-dimensional diffusion. An energy barrier, ΔGr‡, opposes proton-surface-to-bulk release. The ΔGr‡-regulating mechanism thus far has remained unknown. Here, we explored the effect interfacial charges have on ΔGr‡’s enthalpic and entropic constituents, ΔGH‡ and ΔGS‡, respectively. A light flash illuminating a micrometer-sized membrane patch of a free-standing planar lipid bilayer released protons from an adsorbed hydrophobic caged compound. A lipid-anchored pH-sensitive dye reported protons’ arrival at a distant membrane patch. Int

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Rasi-Caldogno, Franca, Maria Chiara Pugliarello, and Maria Ida De Michelis. "Electrogenic Transport of Protons Driven by the Plasma Membrane ATPase in Membrane Vesicles from Radish." Plant Physiology 77, no. 1 (1985): 200–205. http://dx.doi.org/10.1104/pp.77.1.200.

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Sladkov, K. D., and S. S. Kolesnikov. "Model of a Molecular Proton Sensor in Taste Cells." Биологические мембраны Журнал мембранной и клеточной биологии 40, no. 3 (2023): 188–93. http://dx.doi.org/10.31857/s023347552303009x.

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Otopetrins represents a group of membrane proteins that function as proton-selective ion channels. Existing evidence indicates that Otop1, the eponym of the family, is a likely molecular sensor of protons involved in detecting acid stimuli in taste cells of type III. Acid stimuli is believed to initiate an inward current carried by protons through receptive apical membrane to depolarize a type III cell and trigger a train of action potentials driving afferent neurotransmission. While many details of this rather complicated process have not been uncovered yet, mathematical modelling could provi

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Moreno Ostertag, Laila, Xiao Ling, Katrin F. Domke, Sapun H. Parekh, and Markus Valtiner. "Characterizing the hydrophobic-to-hydrophilic transition of electrolyte structuring in proton exchange membrane mimicking surfaces." Physical Chemistry Chemical Physics 20, no. 17 (2018): 11722–29. http://dx.doi.org/10.1039/c8cp01625a.

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The surface density of charged sulfonic acid head groups in a perfluorosulfonic acid (PFSA) proton exchange membrane determines the hydrophilicity of the ionic channels and is thus critical for the structuring and transport of water and protons.

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Berg, Jamie R., Christian M. Spilker, and Simon A. Lewis. "Modulation of polymyxin B effects on mammalian urinary bladder." American Journal of Physiology-Renal Physiology 275, no. 2 (1998): F204—F215. http://dx.doi.org/10.1152/ajprenal.1998.275.2.f204.

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This report demonstrates that Ca2+, Mg2+, and protons alter the ability of polymyxin B (PX, a cationic antibiotic used clinically as a bactericidal agent) to increase the apical membrane conductance of the rabbit urinary bladder. Using electrophysiological methods, we determine that these alterations occur by two mechanisms. First, they blocked the PX-induced conductance in a rapid and reversible manner; second, they competed with PX for a membrane binding site. In addition, Ca2+(but not Mg2+or protons) altered the rate at which the induced conductance could be reversed. When solution pH was g

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Stainbrook, Sarah C., and Joseph M. Jez. "Protecting P-type plasma membrane H+-ATPases from ROS." Biochemical Journal 478, no. 8 (2021): 1511–13. http://dx.doi.org/10.1042/bcj20210109.

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P-type ATPase are ubiquitous transport proteins across all kingdoms of life. These proteins share a common mechanism involving phosphorylation of an invariant aspartate to facilitate movement of substrates from protons to phospholipids across cellular membranes. In this issue of the Biochemical Journal, Welle et al. identify a conserved cysteine near the functionally critical aspartate of P-type plasma membrane H+-ATPases that protects the protein from reactive oxygen species.

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STUCHEBRUKHOV, ALEXEI A. "ELECTRON TRANSFER REACTIONS COUPLED TO PROTON TRANSLOCATION: CYTOCHROME OXIDASE, PROTON PUMPS, AND BIOLOGICAL ENERGY TRANSDUCTION." Journal of Theoretical and Computational Chemistry 02, no. 01 (2003): 91–118. http://dx.doi.org/10.1142/s0219633603000318.

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Cytochrome oxidase (COX) is the terminal component of electron transport chain of the respiratory system in mitochondria, and one of the key enzymes responsible for energy generation in cells. COX functions as a proton pump that utilizes free energy of oxygen reduction for translocation of protons across the mitochondrion membrane. The proton gradient created in the process is later utilized to drive synthesis of ATP. Although the structure of COX has been recently resolved, the molecular mechanism of proton pumping remains unknown. In this paper, general principles and possible molecular mech

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Ausili, Alessio, Inés Rodríguez-González, Alejandro Torrecillas, José A. Teruel, and Juan C. Gómez-Fernández. "Diethylstilbestrol Modifies the Structure of Model Membranes and Is Localized Close to the First Carbons of the Fatty Acyl Chains." Biomolecules 11, no. 2 (2021): 220. http://dx.doi.org/10.3390/biom11020220.

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The synthetic estrogen diethylstilbestrol (DES) is used to treat metastatic carcinomas and prostate cancer. We studied its interaction with membranes and its localization to understand its mechanism of action and side-effects. We used differential scanning calorimetry (DSC) showing that DES fluidized the membrane and has poor solubility in DMPC (1,2-dimyristoyl-sn-glycero-3-phosphocholine) in the fluid state. Using small-angle X-ray diffraction (SAXD), it was observed that DES increased the thickness of the water layer between phospholipid membranes, indicating effects on the membrane surface.

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S, Mohanapriya, and Raj V. "Preparation and Characterization of Nano Titania modified PVA-Pectin polymer electrolyte membranes for DMFC." International Journal of Research in Science 4, no. 2 (2018): 6. http://dx.doi.org/10.24178/ijrs.2018.4.2.06.

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In this study, poly vinyl alcohol and pectin are in situ cross-linked using dual cross-linker comprising a mixture of sulfosuccinic acid and glutaraldehyde followed by solvent casting.Titanium dioxide nanoparticles are incorporated into polymer solutions that controls alignment and disentanglement of polymer chains at molecular level. It is shown that rational design of membrane microstructure with proper arrangement of hydrophobic and hydrophilic domains has been formulated by blending PVA with PC. Water sorption through nanocomposite membrane enhanced when optimum quantity of titanium dioxid

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Khademi, Shahram, and Robert M. Stroud. "The Amt/MEP/Rh Family: Structure of AmtB and the Mechanism of Ammonia Gas Conduction." Physiology 21, no. 6 (2006): 419–29. http://dx.doi.org/10.1152/physiol.00051.2005.

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The atomic structures of the first members of the Amt/MEP/Rh family show that they are 11-crossing membrane proteins that form trimers in the membrane. Each monomer supports a hydrophobic channel that conducts NH3but not any water or ions. The reprotonation of NH3on the receiving side raises the pH on that side in the absence of metabolism of NH3, and there is no transfer of protons through the protein.

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