Gotowe bibliografie tematyczne / Dynamic membranes

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Gotowa bibliografia na temat „Dynamic membranes”

Autor: Grafiati

Data publikacji: 4 czerwca 2021

Data aktualizacji: 14 lutego 2022

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Artykuły w czasopismach na temat "Dynamic membranes"

Madmoune, Y., M. Benhamou, H. Kaïdi i M. Chahid. "Dynamic properties of troubled fluid membranes". International Journal of Academic Research 5, nr 5 (10.10.2013): 5–13. http://dx.doi.org/10.7813/2075-4124.2013/5-5/a.1.

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Bezanilla, Magdalena, Amy S. Gladfelter, David R. Kovar i Wei-Lih Lee. "Cytoskeletal dynamics: A view from the membrane". Journal of Cell Biology 209, nr 3 (11.05.2015): 329–37. http://dx.doi.org/10.1083/jcb.201502062.

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Many aspects of cytoskeletal assembly and dynamics can be recapitulated in vitro; yet, how the cytoskeleton integrates signals in vivo across cellular membranes is far less understood. Recent work has demonstrated that the membrane alone, or through membrane-associated proteins, can effect dynamic changes to the cytoskeleton, thereby impacting cell physiology. Having identified mechanistic links between membranes and the actin, microtubule, and septin cytoskeletons, these studies highlight the membrane’s central role in coordinating these cytoskeletal systems to carry out essential processes, such as endocytosis, spindle positioning, and cellular compartmentalization.

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Matkó, Janos, Janos Szöllösi, Lajos Trón i Sandor Damjanovich. "Luminescence spectroscopic approaches in studying cell surface dynamics". Quarterly Reviews of Biophysics 21, nr 4 (listopad 1988): 479–544. http://dx.doi.org/10.1017/s0033583500004637.

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The major elements of membranes, such as proteins, lipids and polysaccharides, are in dynamic interaction with each other (Albertset al.1983). Protein diffusion in the lipid matrix of the membrane, the lipid diffusion and dynamic domain formation below and above their transition temperature from gel to fluid state, have many functional implications. This type of behaviour of membranes is often summarized in one frequently used word membrane fluidity (coined by Shinitzky & Henkart, 1979). The dynamic behaviour of the cell membrane includes rotational, translational and segmental movements of membrane elements (or their domain-like associations) in the plane of, and perpendicular to the membrane. The ever changing proximity relationships form a dynamic pattern of lipids, proteins and saccharide moieties and are usually described as ‘cell-surface dynamics’ (Damjanovichet al.1981). The knowledge about the above defined behaviour originates from experiments performed mostly on cytoplasmic membranes of eukaryotic cells. Nevertheless numerous data are available also on the mitochondrial and nuclear membranes, as well as endo (sarco-)plasmic reticulum (Martonosi, 1982; Slater, 1981; Siekevitz, 1981).

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Liu, Chuang, i Linan Fan. "Evolutionary algorithm based on dynamical structure of membrane systems in uncertain environments". International Journal of Biomathematics 09, nr 02 (14.01.2016): 1650017. http://dx.doi.org/10.1142/s1793524516500170.

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In this paper, a new evolutionary algorithm based on a membrane system is proposed to solve the dynamic or uncertain optimization problems. The proposed algorithm employs objects, a dynamical membrane structure and several reaction rules of the membrane systems. The object represents a candidate solution of the optimization problems. The dynamical structure consists of the nested membranes where a skin membrane contains several membranes, which is useful for the proposed algorithm that finds optimal solutions. The reaction rules are designed to locate and track the optimal solutions of the dynamic optimization problems (DOPs), which are inspired by processing the chemical compounds in the region of cellular membranes. Experimental study is conducted based on the moving peaks benchmark to evaluate the performance of the proposed algorithm in comparison with three state-of-the-art dynamic optimization algorithms. The results indicate the proposed algorithm is effective to solve the DOPs.

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Gupta, Sudipta, i Rana Ashkar. "The dynamic face of lipid membranes". Soft Matter 17, nr 29 (2021): 6910–28. http://dx.doi.org/10.1039/d1sm00646k.

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Lipid membranes envelope live cells and mediate vital biological functions through regulated spatiotemporal dynamics. This review highlights the role of neutron scattering, among other approaches, in uncovering the dynamic properties of lipid membranes.

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Altman, Marc, David Hasson i Raphael Semiat. "REVIEW OF DYNAMIC MEMBRANES". Reviews in Chemical Engineering 15, nr 1 (styczeń 1999): 1–40. http://dx.doi.org/10.1515/revce.1999.15.1.1.

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Jaksch, Sebastian, Alexandros Koutsioubas, Stefan Mattauch, Olaf Holderer i Henrich Frielinghaus. "Measurements of Dynamic Contributions to Coherent Neutron Scattering". Colloids and Interfaces 2, nr 3 (7.08.2018): 31. http://dx.doi.org/10.3390/colloids2030031.

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In this manuscript, we are investigating the contribution of dynamic membrane properties of phospholipid membranes to coherent scattering signals under grazing incidence. Spectroscopic measurements under grazing incidence can provide useful insight into the properties of biological membranes; however, they are often impeded by weak signals. By using grazing-incidence small-angle neutron scattering (GISANS) to identify a dynamic scattering contribution, we are able to independently corroborate the existence of a previously found dynamic mode, now measured by grazing-incidence neutron spin echo spectroscopy (GINSES). Additionally, by increasing the speed of measurement compared to GINSES from several days to hours, we were able to explore the temperature behavior of this mode in phospholipid membranes. These dynamic modes of the membranes show a wavelength of around 700 Å in-plane of the membrane and are most pronounced around 37 ∘C and strongly decrease at lower temperatures below 25 ∘C before vanishing at 20 ∘C. We therefore speculate that they may be linked to biologically relevant functions of the membranes themselves. To our knowledge, this is the first report of an investigation of that membrane mode by means of GISANS.

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Colom, Adai, Lorena Redondo-Morata, Nicolas Chiaruttini, Aurélien Roux i Simon Scheuring. "Dynamic remodeling of the dynamin helix during membrane constriction". Proceedings of the National Academy of Sciences 114, nr 21 (8.05.2017): 5449–54. http://dx.doi.org/10.1073/pnas.1619578114.

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Dynamin is a dimeric GTPase that assembles into a helix around the neck of endocytic buds. Upon GTP hydrolysis, dynamin breaks these necks, a reaction called membrane fission. Fission requires dynamin to first constrict the membrane. It is unclear, however, how dynamin helix constriction works. Here we undertake a direct high-speed atomic force microscopy imaging analysis to visualize the constriction of single dynamin-coated membrane tubules. We show GTP-induced dynamic rearrangements of the dynamin helix turns: the average distances between turns reduce with GTP hydrolysis. These distances vary, however, over time because helical turns were observed to transiently pair and dissociate. At fission sites, these cycles of association and dissociation were correlated with relative lateral displacement of the turns and constriction. Our findings show relative longitudinal and lateral displacements of helical turns related to constriction. Our work highlights the potential of high-speed atomic force microscopy for the observation of mechanochemical proteins onto membranes during action at almost molecular resolution.

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Lima-Rodriguez, Antonia, Antonio Gonzalez-Herrera i Jose Garcia-Manrique. "Study of the Dynamic Behaviour of Circular Membranes with Low Tension". Applied Sciences 9, nr 21 (5.11.2019): 4716. http://dx.doi.org/10.3390/app9214716.

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The dynamic behaviour of membranes has been widely studied by well-known authors for a long time. A clear distinction can be made between the behaviour of membranes without tension (plate case) and membranes subjected to large tension or pre-strain in their plane (membrane case). In classical theories, less attention has been paid to membranes subjected to a low level of tension, which solution is between both extreme cases. Recently, certain fields of research are demanding solutions for this intermediate behaviour. It is the case of membranes present in MEMS and sensor or the response of the tympanic membrane in mammals hearing system. In this paper, the behaviour of plates and circular membranes with boundary conditions clamped in the edges has been studied. The natural frequencies for both cases (plate and membrane) have been calculated using the solutions of the traditional theories and these have been compared with the numerical frequencies calculated by finite element analysis. The dynamic response of membrane with low tension, corresponding to a transition between these extreme behaviours, has also been calculated. A theoretical solution has been used complemented with a wide set of numerical finite elements calculations. The analytical and numerical solutions are very close, being the error made using both methods very low; nevertheless, there are no analytical solutions for the entire transition zone between the plate and membrane behaviour. Therefore, this range has been completed using finite element analysis. Broad ranges of geometric configurations have been studied. The transition behaviour of the membrane has been clearly identified. The main practical consequences of these results have been discussed, in particular focused on the response of the tympanic membrane.

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Kanagabasai, Lenin. "Factual power loss reduction by dynamic membrane evolutionary algorithm". International Journal of Advances in Applied Sciences 10, nr 2 (1.06.2021): 99. http://dx.doi.org/10.11591/ijaas.v10.i2.pp99-106.

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This paper presents Dynamic Membrane Evolutionary Algorithm (DMEA) has been applied to solve optimal reactive power problem.Proposed methodology merges the fusion and division rules of P systems with active membranes and with adaptive differential evolution (ADE), particle swarm optimization (PSO) exploration stratagem. All elementary membranes are amalgamated into one membrane in the computing procedure. Furthermore, integrated membrane are alienated into the elementary membranes 1, 2,_ m. In particle swarm optimization (PSO) 𝑪𝟏, 𝑪𝟐 (acceleration constants) are vital parameters to augment the explorationability of PSO in the period ofthe optimization procedure.In this work, Gaussian probability distribution isinitiated to engenderthe accelerating coefficients of PSO.Proposed Dynamic Membrane Evolutionary Algorithm (DMEA) has been tested in standard IEEE 14, 30, 57, 118, 300 bus test systems and simulation results show the projected algorithm reduced the real power loss comprehensively.

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Rozprawy doktorskie na temat "Dynamic membranes"

Magi, Ross. "Dynamic behavior of biological membranes". Thesis, The University of Utah, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=3680576.

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Biological membranes are important structural units in the cell. Composed of a lipid bilayer with embedded proteins, most exploration of membranes has focused on the proteins. While proteins play a vital role in membrane function, the lipids themselves can behave in dynamic ways which affect membrane structure and function. Furthermore, the dynamic behavior of the lipids can affect and be affected by membrane geometry. A novel fluid membrane model is developed in which two different types of lipids flow in a deforming membrane, modelled as a two-dimensional Riemannian manifold that resists bending. The two lipids behave like viscous Newtonian fluids whose motion is determined by realistic physical forces. By examining the stability of various shapes, it is shown that instability may result if the two lipids forming the membrane possess biophysical qualities, which cause them to respond differently to membrane curvature. By means of numerical simulation of a simplified model, it is shown that this instability results in curvature induced phase separation. Applying the simplified model to the Golgi apparatus, it is hypothesized that curvature induced phase separation may occur in a Golgi cisterna, aiding in the process of protein sorting.

In addition to flowing tangentially in the membrane, lipids also flip back and forth between the two leaflets in the bilayer. While traditionally assumed to occur very slowly, recent experiments have indicated that lipid flip-flop may occur rapidly. Two models are developed that explore the effect of rapid flip-flop on membrane geometry and the effect of a pH gradient on the distribution of charged lipids in the leaflets of the bilayer. By means of a stochastic model, it is shown that even the rapid flip-flop rates observed are unlikely to be significant inducers of membrane curvature. By means of a nonlinear Poisson- Boltzmann model, it is shown that pH gradients are unlikely to be significant inducers of bilayer asymmetry under physiological conditions.

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Waheed, Qaiser. "Molecular Dynamic Simulations of Biological Membranes". Doctoral thesis, KTH, Teoretisk biologisk fysik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-102268.

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Biological membranes mainly constituent lipid molecules along with some proteins and steroles. The properties of the pure lipid bilayers as well as in the presence of other constituents (in case of two or three component systems) are very important to be studied carefully to model these systems and compare them with the realistic systems. Molecular dynamic simulations provide a good opportunity to model such systems and to study them at microscopic level where experiments fail to do. In this thesis we study the structural and dynamic properties of the pure phospholipid bilayers and the phase behavior of phospholipid bilayers when other constituents are present in them. Material and structural properties like area per lipid and area compressibility of the phospholipids show a big scatter in experiments. These properties are studied for different system sizes and it was found that the increasing undulations in large systems effect these properties. A correction was applied to area per lipid and area compressibility using the Helfrich theory in Fourier space. Other structural properties like order of the lipid chains, electron density and radial distribution functions are calculated which give the structure of the lipid bilayer along the normal and in the lateral direction. These properties are compared to the X-ray and neutron scattering experiments after Fourier transform. Thermodynamic properties like heat capacity and heat of melting are also calculated from derivatives of energies available in molecular dynamics. Heat capacity on the other hand include quantum effect and are corrected for that by applying quantum correction using normal mode analysis for a simple as well as ambiguous system like water. Here it is done for SPC/E water model. The purpose of this study is to further apply the quantum corrections on macromolecules like lipids by using this technique. Furthermore the phase behavior of two component systems (phospholipids/cholesterol) is also studied. Phase transition in these systems is observed at different cholesterol concentrations as a function of temperature by looking at different quantities (as an order parameter) like the order of chains, area per molecule and partial specific area. Radial distribution functions are used to look at the in plane structure for different phases having a different lateral or positional order. Adding more cholesterol orders the lipid chains changing a liquid disordered system into a liquid ordered one and turning a solid ordered system into a liquid ordered one. Further more the free energy of domain formation is calculated to investigate the two phasecoexistence in binary systems. Free energy contains two terms. One is bulk freeenergy which was calculated by the chemical potential of cholesterol moleculein a homogeneous system which is favorable for segregation. Second is thefree energy of having an interface which is calculated from the line tension of the interface of two systems with different cholesterol concentration which in unfavorable for domain formation. The size of the domains calculated from these two contributions to the free energy gives the domains of a few nm in size. Though we could not find any such domains by directly looking at our simulations.

QC 20120913

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Turkson, Abraham K. "Electro-ultrafiltration with rotating dynamic membranes". Thesis, McGill University, 1985. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=72036.

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In axial electrofiltration, a DC electric field is imposed between a rotating inner cylinder and a stationary outer cylinder giving rise to four mechanisms which act to minimize solute accumulation at the filter surface: turbulence, centrifugal force, electrophoresis and shear stress which removes solute aggregates.
Four dynamic membranes, Zr(IV) oxide, calcium oleate, poly-2-vinylpyridine and cadmium sulfide, were used to filter bovine serum albumin (BSA) in a disodium phosphate solution at pH = 8 and Prussian blue in distilled water. Prussian blue is a particle of 0.01(mu)m diameter with a zeta potential of -41mV while BSA is a macromolecule of 69,000 molecular weight, a Stokes-Einstein radius of 0.0038(mu)m and a zeta potential of -23.3mV at pH = 8. For BSA, the flux declined with time while the rejection increased. Filtrate fluxes increased with rotation rate and electric field and declined with concentration for both feeds. The flux declined beyond N = 2000rpm and was constant above C(,0) = 5.0wt%. For Prussian blue, the rejection was greater than 90% at all levels of E, N and C(,0). For BSA, the rejection increased with rotation rate and declined with concentration. The BSA rejection declined above N = 2000rpm and was constant beyond C(,0) = 0.5wt%.
A mathematical model was derived to predict the time variation of filtrate flux and a rejection model was used to predict the effect of surface concentration on BSA rejection.

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Ip, Anita Wai Ching Chemical Sciences &amp Engineering Faculty of Engineering UNSW. "Dynamic membranes: formation and characterisation studies". Awarded by:University of New South Wales, 2005. http://handle.unsw.edu.au/1959.4/37836.

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Dynamic membranes are considered to be an attractive anti-fouling remedy for membrane filtration, because once fouled, they can be removed and reformed in-situ, thereby prolonging the support membrane???s lifetime. However, large-scale application of dynamic membranes has been limited due to the numerous formation parameters that influence their properties. This thesis provides better understanding of the mechanisms of the dynamic membrane formation process through fundamental formation and characterisation studies of dynamically formed titanium dioxide membranes in laboratory scale dead-end and crossflow systems. The dynamic membranes exhibited water fluxes ranging from 30-1147 L/m2h and dextran (500 kDa) rejections as high as 99.9%. Of the six formation parameters studied, the pH and constant flux conditions had the greatest influence on dynamic membrane properties. The pH affects dynamic membrane properties by changing particle aggregation prior to dynamic membrane formation, while constant flux conditions affect the drag force on particles during deposition thereby altering cake compressibility. The advantage of using the novel concept of constant flux formation over traditional constant pressure formation is that it enables greater control of particle deposition during dynamic membrane formation. Dextran rejection data also suggested the existence of a critical mass loading, above which dynamic membrane flux and rejection properties are reduced. This thesis also demonstrated the utility of a factorial design experiment for preliminary identification and evaluation of the critical factors affecting dynamic membrane formation, a method which could be invaluable for tailoring dynamic membranes for use in specific applications. In addition, cake removal data suggested that more than 80% of the dried cake could be removed providing a high potential for membrane regeneration. For the formation conditions studied, it was concluded that convection was the dominant mechanism governing particle transport during dynamic membrane formation. The fluxes and cake properties of the dynamic membranes were best described by the resistance-in-series model for simple dead-end microfiltration. Furthermore, the higher cake void fraction required to fit the experimental data (at low formation pressure or constant flux conditions) with model predictions suggested that the ratio of shear to convection was an important mechanistic parameter determining dynamic membrane properties.

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SOARES, RENATA MACHADO. "DYNAMIC ANALYSIS OF HYPERLASTIC CIRCULAR MEMBRANES". PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2009. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=13790@1.

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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO
COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR
CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO
FUNDAÇÃO DE APOIO À PESQUISA DO ESTADO DO RIO DE JANEIRO
Nesta tese são estudadas as vibrações não-lineares de membranas circulares inicialmente tracionadas sujeitas a deformações finitas. O material da membrana é modelado como um material hiperelástico neo-Hookeano, isotrópico e incompressível. Baseada na teoria de deformações finitas para membranas hiperelásticas, uma formulação variacional é desenvolvida. Primeiro a solução da membrana sob tração radial uniforme é obtida e então as equações de movimento da membrana são obtidas pelo princípio de Hamilton. A partir das equações linearizadas, as freqüências e os modos de vibração da membrana são obtidos analiticamente. Os modos naturais são usados para aproximar o campo de deformações não-linear usando o método de Galerkin e modelos de ordem reduzida são deduzidos através do método de Karhunen-Loève e de métodos analíticos. Além disso, estuda-se a influência da variação da massa específica e da espessura ao longo da direção radial da membrana nas vibrações. A seguir a mesma metodologia é utilizada para uma membrana anular. Por fim, estudam-se as vibrações não-lineares da membrana anular acoplada a uma inclusão rígida que insere tensões de tração na membrana, pois, devido ao seu peso próprio, provoca deslocamentos estáticos transversais e axissimétricos na membrana. Os mesmos problemas são analisados por elementos finitos utilizando o programa comercial Abaqus.
This work presents an analysis of the nonlinear vibration response of a prestretched hyperelastic circular membrane subjected to finite deformations. The membrane material is assumed to be isotropic, homogeneous and neo-Hookean. Based on the theory of finite deformations for hyperelastic membranes, a variational formulation is developed. First the exact solution of the membrane under a uniform radial stretch is obtained and then the equations of motion of the pre-stretched membrane are derived using the Hamilton’s principle. From the linearized equations of motion, the natural frequencies and mode shapes of the membrane are obtained analytically. Then the natural modes are used to approximate the nonlinear deformation field using the Galerkin method. Several reduced order models are tested using the Karhunen-Loève method and analytical methods. Besides, the influence of the variation of the membrane thickness and material density along the radial direction of the membrane on the vibrations is investigated. The same methodology it is used for the annular membrane. Finally, the non-linear vibrations of the annular membrane coupled to a rigid inclusion are studied. The rigid inclusion inserts traction forces in the membrane and its own weight causes static transverse and radial displacements in the membrane. The same problems are analyzed by finite elements using the commercial program Abaqus®.

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McCarthy, Nicola L. C. "Imaging dynamic patterning in lipid membranes". Thesis, Imperial College London, 2016. http://hdl.handle.net/10044/1/44075.

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Lateral inhomogeneity in biological membranes has been linked with many cellular functionalities including protein sorting and signal transduction. Fluid phase coexistence has been extensively studied by modelling membranes as bulk mesophases and as giant unilamellar vesicles (GUVs). However, the basis for microdomain formation in cells remains uncertain, and this is thought to be due to the small domain size and the highly dynamic nature of the cell membrane. The application of high pressure technology offers an ideal biophysical tool for the study of phase behaviour in model membranes both in and out of equilibrium. By coupling high-pressure technology with fluorescence microscopy we have been able to simultaneously induce and visualize phase separation in GUVs. This allows the structural dynamics (including domain size and morphology in individual vesicles) to be studied, which ideally compliments small angle x-ray scattering (SAXS) measurements of bulk mesophase properties. We employ high pressure technology to induce thickness mismatch and therefore alter the line tension between coexisting liquid domains, and to study the pressure effects on the lateral structuring of membranes containing general anaesthetics. The ability to trigger rapid phase separation using pressure-jumps across the phase boundary has been used to study the dynamic evolution of structural changes, with time-resolved microscopy and SAXS giving an insight into transition kinetics, energetics and mechanisms.

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Nandurkar, Kuldeep Pandurang. "Static and Dynamic Behavior of Stress Coated Membranes". Thesis, Montana State University, 2006. http://etd.lib.montana.edu/etd/2006/nandurkar/NandurkarK0806.pdf.

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Large space mirrors need to be made of ultra-lightweight materials (membranes) that have very low densities and high flexibility (compliance) for packaging. A coating application necessary for optical reflectivity may also impart to these ultra-lightweight materials a desired shape and to help maintain that shape in the harsh environment of space. When a coating is applied on the membrane substrate, stresses develop in the coating due to atomistic processes. These stresses are fundamental to the final shape of the substrate. Coatings applied to the substrate in order to maintain a particular shape are known as the 'stress coating prescription'. As there is no way one could directly measure stresses in the coatings experimentally, in this work it will be explained how finite element analysis (FEA) was used in estimating stresses in the coatings. This work mainly comprises static pressuredeflection tests (bulge tests) on the coated and uncoated membranes, and a comparison of the experimental results to FEA findings in order to estimate the stresses in the coatings. Before FEA results are matched with the experimental results, an analytical solution to the problem in hand will be derived. Uncertainties due to variation in coating thicknesses and difficulties in coating process have led to various uncertainties in this work, and these uncertainties are also discussed. The ability to use changes in vibration frequency as a measure of coating stress is also investigated.

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Al-Malack, Muhammad Hassan. "Applications of dynamic membranes to crossflow microfiltration of secondary effluent". Thesis, University of Newcastle Upon Tyne, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.335944.

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Thurmond, Robin Leroy. "Average and dynamic properties of membrane lipids studied by deuterium NMR spectroscopy". Diss., The University of Arizona, 1992. http://hdl.handle.net/10150/185835.

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If the function of membrane lipids were only to provide a permeability barrier for cells, than a single lipid species such as phosphatidylcholine would suffice since it would maintain the bilayer structure necessary for a membrane. Cells, however, go out of their way to regulate the components of their membranes and therefore there must be some reason for the vast diversity of lipids found even in a single membrane. Modulation of the phospholipid composition could affect both the average and dynamical properties of the entire system. Average properties such as the hydrocarbon thickness, the area per lipid molecule, or the curvature stress across the bilayer could play a role in membrane function and therefore it is important to understand how different lipid components influence these physical properties. The goal of this work has been to understand how different lipid components such as changes in headgroup and acyl chain unsaturation as well as cholesterol and bile salts affect the properties and structure of membranes through the use of deuterium nuclear magnetic resonance spectroscopy (²H NMR). Saturated and unsaturated phosphatidylethanolamines and phosphatidylcholines have been studied in the low temperature, lamellar liquid-crystalline, and reversed hexagonal phases. Measurements have been made of the average projected acyl chain length, the average area per molecule, the radius of curvature in hexagonal phases, and various relaxation rates. These studies were not only carried out on single component synthetic systems but also mixture of lipids and even native membranes through the use of a deuterated probe molecule. It was concluded that different lipids modulate different properties of membranes. Phosphatidylcholines along with monounsaturation keep the membranes in a fluid state whereas the presence of phosphatidylethanolamines and polyunsaturation increase the curvature stress in the monolayers. With this in mind experiments were carried out to determine how the average properties of membranes relate to membrane protein function. These studies show the promise of combining physical chemical measurements of membrane properties with biochemical measures of protein function. Such studies will allow for a better understanding of membrane function and the role lipid diversity plays in such functions.

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Saggiomo, Vittorio [Verfasser]. "Ion transport across membranes mediated by a dynamic combinatorial library / Vittorio Saggiomo". Kiel : Universitätsbibliothek Kiel, 2010. http://d-nb.info/1019984619/34.

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Książki na temat "Dynamic membranes"

Transmembrane dynamic lipids. Hoboken, NJ: Wiley, 2012.

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Martonosi, Anthony N. The Enzymes of Biological Membranes: Volume 1 Membrane Structure and Dynamics. Boston, MA: Springer US, 1985.

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NATO Advanced Study Institute on Dynamics and Biogenesis of Membranes (1989 Cargèse, France). Dynamics and biogenesis of membranes. Berlin: Springer-Verlag, 1990.

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Sansom, M. S. P., i Philip Charles Biggin. Molecular simulations and biomembranes: From biophysics to function. Cambridge: Royal Society of Chemistry, 2010.

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Op den Kamp, J. A. F., red. Dynamics and Biogenesis of Membranes. Berlin, Heidelberg: Springer Berlin Heidelberg, 1990. http://dx.doi.org/10.1007/978-3-642-74194-4.

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Chattopadhyay, Amitabha, red. Membrane Organization and Dynamics. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-66601-3.

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Quinn, Peter J., red. Membrane Dynamics and Domains. Boston, MA: Springer US, 2004. http://dx.doi.org/10.1007/978-1-4757-5806-1.

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Op den Kamp, Jos A. F., red. Dynamics of Membrane Assembly. Berlin, Heidelberg: Springer Berlin Heidelberg, 1992. http://dx.doi.org/10.1007/978-3-662-02860-5.

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Op den Kamp, Jos A. F., red. Biological Membranes: Structure, Biogenesis and Dynamics. Berlin, Heidelberg: Springer Berlin Heidelberg, 1994. http://dx.doi.org/10.1007/978-3-642-78846-8.

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Wirtz, K. W. A., red. Membrane Receptors, Dynamics, and Energetics. Boston, MA: Springer US, 1987. http://dx.doi.org/10.1007/978-1-4684-5335-5.

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Części książek na temat "Dynamic membranes"

Park, Chi Hoon. "Dynamic Mechanical Analysis". W Encyclopedia of Membranes, 1–5. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-642-40872-4_1093-5.

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Kovács, Zoltán. "Dynamic-Volume Diafiltration". W Encyclopedia of Membranes, 1–2. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-40872-4_665-3.

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Jaffrin, M. Y. "Dynamic Membrane Microfiltration". W Encyclopedia of Membranes, 1–4. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-40872-4_957-2.

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Kovács, Zoltán. "Dynamic-Volume Diafiltration". W Encyclopedia of Membranes, 620–21. Berlin, Heidelberg: Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-662-44324-8_665.

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Jaffrin, Michel. "Dynamic Membrane Microfiltration". W Encyclopedia of Membranes, 616–19. Berlin, Heidelberg: Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-662-44324-8_957.

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Park, Chi Hoon. "Dynamic Mechanical Analysis". W Encyclopedia of Membranes, 607–10. Berlin, Heidelberg: Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-662-44324-8_1093.

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Yampolskii, Yuri. "Dynamic Free Volume". W Encyclopedia of Membranes, 606. Berlin, Heidelberg: Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-662-44324-8_193.

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Piacentini, Emma, Alessandra Imbrogno i Richard G. Holdich. "Dynamic Membrane Emulsification". W Encyclopedia of Membranes, 610–16. Berlin, Heidelberg: Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-662-44324-8_194.

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Yampolskii, Yuri. "Dynamic Free Volume". W Encyclopedia of Membranes, 1–2. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-642-40872-4_193-4.

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Piacentini, E., A. Imbrogno i R. G. Holdich. "Dynamic Membrane Emulsification". W Encyclopedia of Membranes, 1–7. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-642-40872-4_194-1.

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Streszczenia konferencji na temat "Dynamic membranes"

Hossain, N., Kyeongsik Woo i Christopher Jenkins. "Dynamic Response of Systematically Creased Membranes". W 48th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2007. http://dx.doi.org/10.2514/6.2007-1806.

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Fox, Jason W., i Nakhiah C. Goulbourne. "Nonlinear dynamic characteristics of dielectric elastomer membranes". W The 15th International Symposium on: Smart Structures and Materials & Nondestructive Evaluation and Health Monitoring, redaktor Yoseph Bar-Cohen. SPIE, 2008. http://dx.doi.org/10.1117/12.776692.

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Koombua, Kittisak, Ramana M. Pidaparti, P. Worth Longest i Gary M. Atkinson. "Micropump With Six Vibrating Membranes: Design Analysis". W ASME 2008 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/detc2008-49487.

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In this study, a novel design of multiple vibrating membrane micropump has been investigated. The micropump is composed of six membranes and three nozzle/diffuser elements. The membranes were vibrated out-of-phase simultaneously to create pressure difference in the pump chamber. The characteristics of this micropump were analyzed using the finite volume method. The commercial computational fluid dynamics software, FLUENT, with the dynamic mesh algorithm was employed to study velocity field and flow rate during the operating cycle. The simulation results showed that the movement of these membranes combined with the rectification behavior of three nozzle/diffuser elements can minimize back flow and improve net flow in one direction. The average mass flow rate from the micropump increased when the maximum membrane displacement and membrane frequency increased. However, the average mass flow rate from the micropump decreased when pressure head increased. Increases in maximum pressure head were associated with increases in membrane frequency.

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Shi, Hongyang, Thassyo Pinto, Xinda Qi, Demetris Coleman, Silvia Matt, Weilin Hou i Xiaobo Tan. "Dynamic Modeling of Voice Coil Motor-Actuated Flexible Membranes". W ASME 2020 Dynamic Systems and Control Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/dscc2020-3321.

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Abstract In this paper, we derive a dynamical model for a controllable flexible membrane which is point-actuated by distributed voice coil motors (VCM) connected to it. Besides the modal analysis of the membrane motion, which is the only dynamics discussed in most of related published works treating external pressures as inputs, we integrate the dynamics of the voice coil motors including mechanics and electrical dynamics into the whole system, leaving the electrical signals as inputs to the VCM-actuated membrane system, which is useful for practical application. Also, the multiple-input-multiple-output (MIMO) system is simplified by transforming the dynamics equations into Laplace domain and into a matrix form, which makes the derived transfer functions concise and easier for analysis. It is demonstrated that the eigenmodes of an undamped free-vibration model can be used for approximating the deflection of a forced damping membrane. Furthermore, a reduced-order model is constructed for the flexible membrane system with two voice coil motors symmetrically located on the diameter of the membrane, which is subsequently validated with experimental results obtained on a 2-by-1-VCM-actuated membrane prototype.

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Romero, T., i W. Me´rida. "Transient Water Transport in Nafion Membranes Under Activity Gradients". W ASME 2010 8th International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2010. http://dx.doi.org/10.1115/fuelcell2010-33317.

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Transient water transport experiments on Nafion of different thicknesses were carried out in the temperature range of 30 to 70 °C. These experiments report on water transport measurements under activity gradients in the time domain for liquid and vapour equilibrated Nafion membranes. Using a permeability test rig with a gated valve, the water crossover was measured as a function of time. The typical response is shown as a time dependent flux, and it shows the dynamic transport from an initially dry condition up to the final steady state. Contrarily to previous reports from dynamic water transport measurements, where the activity gradient across the membrane is absent; in this work, the membrane was subjected to an activity gradient acting as the driving force to transport water from an environment with higher water activity to an environment with lower water activity through the membrane’s structure. Measurements explored temperature and membrane thickness variation effect on the transient response. Results showed dependency on temperature and a slower water transport rate across the vapour-membrane interface than for the liquid-membrane interface. These measurements showed the transport dependency on water content at the beginning of the experiment when the membrane was in a close-to-dry condition suggesting a transport phenomenon transition due to a reached critical water content value. The new protocol for transient measurements proposed here will allow the characterization of water transport dependency on membrane water content with a more rational representation of the membrane-environment interface.

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Young, Leyland, i Perngjin Pai. "Numerical and Experimental Dynamic Characteristics of Thin-Film Membranes". W 45th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics & Materials Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2004. http://dx.doi.org/10.2514/6.2004-1618.

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Castro-Román, Francisco, Mauricio Carbajal, Luis Manuel Montaño, Oscar Rosas-Ortiz, Sergio A. Tomas Velazquez i Omar Miranda. "Dynamic Structure of Lipid Membranes: Lamellar Diffraction in Concert with Molecular Dynamics Simulations". W Advanced Summer School in Physics 2007. AIP, 2007. http://dx.doi.org/10.1063/1.2825115.

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Cheddie, Denver. "Dynamic Modeling of Water Sorption in PEM Fuel Cells". W ASME 2009 7th International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2009. http://dx.doi.org/10.1115/fuelcell2009-85016.

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This paper compares two models of dynamic water sorption in Nafion® membranes of polymer electrolyte fuel cells. The first sorption model, commonly used in fuel cell modeling, is based on an assumption of perpetual equilibrium between the membrane water and water vapor at all membrane/vapor interfaces. The second approach, based on non-equilibrium dynamics, assumes that the rate of water sorption in the membrane is proportional to the difference between its actual water content and the equilibrium value. Results show that the steady state membrane water concentration gradient is lower in the equilibrium model, which means that it underestimates the cathode side flooding and anode side dehydration phenomena, compared with the nonequilibrium model. The transient response to changes in cathode humidification is also shown to be significantly different under both models.

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Kolsti, Kyle, i Donald Kunz. "Dynamic Simulation of Geometrically Nonlinear Membranes Using Hermite Time Interpolation." W 53rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference
20th AIAA/ASME/AHS Adaptive Structures Conference
14th AIAA. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2012. http://dx.doi.org/10.2514/6.2012-1973.

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Gerbach, R., F. Naumann, M. Ebert, J. Bagdahn, J. Klattenhoff i C. Rembe. "Dynamic Analyses of Membranes and Thin Films on Wafer Level". W 2007 IEEE International Conference on Microelectronic Test Structures. IEEE, 2007. http://dx.doi.org/10.1109/icmts.2007.374486.

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Raporty organizacyjne na temat "Dynamic membranes"

Wolfe, W. P., J. M. Nelsen, R. S. Baty, G. A. Laguna, F. J. Mello, C. E. Hailey i N. T. Snyder. A gridless technique for fluid/structural dynamic coupling on flexible membranes. Office of Scientific and Technical Information (OSTI), styczeń 1996. http://dx.doi.org/10.2172/201803.

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Parikh, Atul N., Sunil K. Sinha, Jeremy Sanborn, Mira Patel, Viviane Ngassam, Doug Gettel, Thomas Wilkop i in. Dynamical Self-Assembly: Constrained phase separation and mesoscale dynamics in lipid membranes (Final Report). Office of Scientific and Technical Information (OSTI), czerwiec 2019. http://dx.doi.org/10.2172/1525891.

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Woolf, Thomas B., Paul Stewart Crozier i Mark Jackson Stevens. Molecular dynamics of membrane proteins. Office of Scientific and Technical Information (OSTI), październik 2004. http://dx.doi.org/10.2172/919637.

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Gutman, Menachem. Probing of Membrane's Surface by Dynamic Measurements of Proton Diffusion. Fort Belvoir, VA: Defense Technical Information Center, styczeń 1991. http://dx.doi.org/10.21236/ada230747.

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Dutta, Prabir K. Photochemical charge separation in zeolites: Electron transfer dynamics, nanocrystals and zeolitic membranes. Final technical report. Office of Scientific and Technical Information (OSTI), wrzesień 2001. http://dx.doi.org/10.2172/809077.

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Godfrey, Thomas A. Verification of Dynamic Load Factor for Analysis of Airblast-Loaded Membrane Shelter Panels by Nonlinear Finite Element Calculations. Fort Belvoir, VA: Defense Technical Information Center, lipiec 1991. http://dx.doi.org/10.21236/ada238939.

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Haskins, William E., Michael D. Leavell, Pamela Lane, Richard B. Jacobsen, Joohee Hong, Marites J. Ayson, Nichole L. Wood i in. Chemical crosslinking and mass spectrometry studies of the structure and dynamics of membrane proteins and receptors. Office of Scientific and Technical Information (OSTI), marzec 2005. http://dx.doi.org/10.2172/922763.

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Tiburu, Elvis K. Determination of the Dynamics, Structure, and Orientation of the Transmembrane Segment of ErbB2 in Model Membranes Using Solid-State NMR Spectroscopy. Fort Belvoir, VA: Defense Technical Information Center, marzec 2008. http://dx.doi.org/10.21236/ada482328.

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