Готові списки джерел за темами / Interface membrane

Добірка наукової літератури з теми "Interface membrane"

Автор: Grafiati
Опубліковано: 8 червня 2024

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Статті в журналах з теми "Interface membrane":

1

SAMART, NUTTAPORN, JESSICA SAEGER, KENNETH J. HALLER, MANUEL AURELIANO, and DEBBIE C. CRANS. "INTERACTION OF DECAVANADATE WITH INTERFACES AND BIOLOGICAL MODEL MEMBRANE SYSTEMS: CHARACTERIZATION OF SOFT OXOMETALATE SYSTEMS." Journal of Molecular and Engineering Materials 02, no. 01 (March 2014): 1440007. http://dx.doi.org/10.1142/s2251237314400073.

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Decavanadate is a polyoxometalate consisting of 10 octahedral vanadium centers, which has been found to exert biological effects and has been observed in vivo. Biological activity implies that a material is taken up into a cell or that the material interacts with membrane receptors. Because of the large size and the high molecular charge, it is nontrivial to anticipate how such a large anion interacts with membranes and whether it will be taken up by cells. Therefore, it becomes important to investigate how the anion interacts with membranes and membrane model systems. Since ion pairing is important for the interaction of this large complex with any membrane interface system, we investigate both the nature of Coulombic and neutral noncovalent interactions with membrane model interface systems and cellular systems. Specifically, we used microemulsions as model systems, and in the specific phase diagram regime where reverse micelles form. We find that, there is a large difference in the interaction with different interfaces, and that charge can have an important role. The negatively charged interface repels the anion, whereas a positive interface attracts the anion. However, the interface with neutral surfactant head groups also is found to repel the decavanadate. This result demonstrates that the discrete charge Coulombic interactions are not the only forces in effect, and that the interactions are at least to a first approximation dictated by the interface charge and not by the counterions in the system. Alternative forces include van der Waals attraction, pH of the water pool, and field and surface effects. Because biological membranes have differently charged ligands, it is not clear which interface systems provide the best analogy with cell surfaces. However, surface charge may affect the compounds and facilitate the interactions that could be important. For example, a positively charged surface could potentially facilitate hydrolysis and sequential abstraction of one or two vanadium atoms at a time from decavanadate. Recently, decavanadate was used as a structural model for the V2O5material. Negatively charged interfaces have also been found to accelerate compound hydrolysis or in other ways alter reactions in compounds near the interface. Lipid-like interfaces potentially contribute to processing of coordination compounds. Decavanadate has been found to interact with proteins and insulin enhancing effects have been reported. Interactions with coordination compounds and the mechanisms of interactions should continue to be investigated because such systems may reveal the mode of interaction of these compounds.
2

Zhao, Di, Jinyun Xu, Yu Sun, Minjing Li, Guoqiang Zhong, Xudong Hu, Jiefang Sun, et al. "Composition and Structure Progress of the Catalytic Interface Layer for Bipolar Membrane." Nanomaterials 12, no. 16 (August 21, 2022): 2874. http://dx.doi.org/10.3390/nano12162874.

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Bipolar membranes, a new type of composite ion exchange membrane, contain an anion exchange layer, a cation exchange layer and an interface layer. The interface layer or junction is the connection between the anion and cation exchange layers. Water is dissociated into protons and hydroxide ions at the junction, which provides solutions to many challenges in the chemical, environmental and energy fields. By combining bipolar membranes with electrodialysis technology, acids and bases could be produced with low cost and high efficiency. The interface layer or junction of bipolar membranes (BPMs) is the connection between the anion and cation exchange layers, which the membrane and interface layer modification are vital for improving the performance of BPMs. This paper reviews the effect of modification of a bipolar membrane interface layer on water dissociation efficiency and voltage across the membrane, which divides into three aspects: organic materials, inorganic materials and newly designed materials with multiple components. The structure of the interface layer is also introduced on the performance of bipolar membranes. In addition, the remainder of this review discusses the challenges and opportunities for the development of more efficient, sustainable and practical bipolar membranes.
3

Qu, Jianzhou, Zhou Yu, and Alexander Urban. "The Mechanism of Hydrogen Evolution Reaction at the Buried Interface of Silica-Coated Electrocatalysts." ECS Meeting Abstracts MA2023-01, no. 36 (August 28, 2023): 2104. http://dx.doi.org/10.1149/ma2023-01362104mtgabs.

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Semipermeable oxide coatings can protect electrocatalysts in harsh environments without reducing the catalytic performance (Labrador, Esposito et al. ACS Catal. 8, 2018, 1767–1778), making them attractive for direct seawater electrolysis. We recently showed that the buried SiO2/Pt interface of silica-coated platinum electrocatalysts is environment-dependent and changes with the pH value of the electrolyte and the electrode potential (Qu and Urban, ACS Appl. Mater. Interfaces 12, 2020, 52125–52135). Here, we discuss the impact of silica membrane coatings on the hydrogen evolution reaction (HER) mechanism at the interface with different transition-metal surfaces. Stable configurations of the buried SiO2/TM interface at HER conditions were determined using density-functional theory (DFT) calculations. Computed Pourbaix diagrams for different transition-metal substrates show the pH and potential dependence of reaction intermediates and the hydrogen coverage on the metal surface. Our results indicate that the HER mechanism at the buried SiO2/catalyst interfaces may involve the silica membrane. Hence, besides the protective quality of silica membranes, this also points to the possibility of designing synergistic membrane-coated electrocatalysts that surpass the bare surfaces of earth-abundant transition metals in terms of catalytic performance (stability, activity, and/or selectivity).
4

Klyuchnikov, A. I. "DEVELOPMENT OF MEMBRANE TECHNOLOGY REALIZING HYDRODYNAMIC INSTABILITY AT THE INTERFACE «MEMBRANE – INITIAL SOLUTION»." Agro-Industrial Technologies of Central Russia 29, no. 3 (September 2023): 99–115. http://dx.doi.org/10.24888/2541-7835-2023-29-99-115.

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Concentration polarization in membrane processes of separation and concentration is considered as an inevi-table negative phenomenon, leading to a decrease in the specific throughput of membranes up to their com-plete stop under the influence of a high-concentration layer at the “membrane-initial solution” interface. A wide variety of ways to reduce the concentration polarization on the membrane surface depends on the deci-sive factors that determine the type of membrane process, the nature of the processed process fluid, the or-ganization of hydrodynamic conditions at the interface, the magnitude of the surface forces that hold the high-concentration layer on the membrane, etc. In essence, there are simply no universal ways to reduce the phenomenon of concentration polarization at the interface, primarily due to the complexity of the phenomena and processes occurring and interacting with each other in the near-membrane region. The specificity and multicomponent nature of the composition of most process fluids processed using membranes dictate their own conditions for ensuring a stable specific throughput, which differ in their effect on the near-membrane layer and, in particular, the hydrodynamic structure of the flow. In this paper, we consider a scientific con-cept for the creation of membrane technology with a low level of concentration polarization through the use of various technical means placed in a tubular membrane channel and working according to a certain algo-rithm in order to create a controlled hydrodynamic instability at the “membrane – initial solution” interface.
5

Zhang, Wenjuan, Wei Cheng, Ramato Ashu Tufa, Caihong Liu, David Aili, Debabrata Chanda, Jing Chang, Shaopo Wang, Yufeng Zhang, and Jun Ma. "Studies on Anion Exchange Membrane and Interface Properties by Electrochemical Impedance Spectroscopy: The Role of pH." Membranes 11, no. 10 (October 10, 2021): 771. http://dx.doi.org/10.3390/membranes11100771.

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Ion-exchange membranes (IEMs) represent a key component in various electrochemical energy conversion and storage systems. In this study, electrochemical impedance spectroscopy (EIS) was used to investigate the effects of structural changes of anion exchange membranes (AEMs) on the bulk membrane and interface properties as a function of solution pH. The variations in the physico/electrochemical properties, including ion exchange capacity, swelling degree, fixed charge density, zeta potentials as well as membrane and interface resistances of two commercial AEMs and cation exchange membranes (CEMs, as a control) were systematically investigated in different pH environments. Structural changes of the membrane surface were analyzed by Fourier transform infrared and X-ray photoelectron spectroscopy. Most notably, at high pH (pH > 10), the membrane (Rm) and the diffusion boundary layer resistances (Rdbl) increased for the two AEMs, whereas the electrical double layer resistance decreased simultaneously. This increase in Rm and Rdbl was mainly attributed to the deprotonation of the tertiary amino groups (-NR2H+) as a membrane functionality. Our results show that the local pH at the membrane-solution interface plays a crucial role on membrane electrochemical properties in IEM transport processes, particularly for AEMs.
6

Ermakov, Yury. "Electric Fields at the Lipid Membrane Interface." Membranes 13, no. 11 (November 16, 2023): 883. http://dx.doi.org/10.3390/membranes13110883.

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This review presents a comprehensive analysis of electric field distribution at the water–lipid membrane interface in the context of its relationship to various biochemical problems. The main attention is paid to the methodological aspects of bioelectrochemical techniques and quantitative analysis of electrical phenomena caused by the ionization and hydration of the membrane–water interface associated with the phase state of lipids. One of the objectives is to show the unique possibility of controlling changes in the structure of the lipid bilayer initiated by various membrane-active agents that results in electrostatic phenomena at the surface of lipid models of biomembranes—liposomes, planar lipid bilayer membranes (BLMs) and monolayers. A set of complicated experimental facts revealed in different years is analyzed here in order of increasing complexity: from the adsorption of biologically significant inorganic ions and phase rearrangements in the presence of multivalent cations to the adsorption and incorporation of pharmacologically significant compounds into the lipid bilayer, and formation of the layers of macromolecules of different types.
7

Van Cleave, Cameron, Heide A. Murakami, Nuttaporn Samart, Jordan T. Koehn, Pablo Maldonado, Heidi D. Kreckel, Elana J. Cope, Andrea Basile, Dean C. Crick, and Debbie C. Crans. "Location of menaquinone and menaquinol headgroups in model membranes." Canadian Journal of Chemistry 98, no. 6 (June 2020): 307–17. http://dx.doi.org/10.1139/cjc-2020-0024.

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Menaquinones are lipoquinones that consist of a headgroup (naphthoquinone, menadione) and an isoprenyl sidechain. They function as electron transporters in prokaryotes such as Mycobacterium tuberculosis. For these studies, we used Langmuir monolayers and microemulsions to investigate how the menaquinone headgroup (menadione) and the menahydroquinone headgroup (menadiol) interact with model membrane interfaces to determine if differences are observed in the location of these headgroups in a membrane. It has been suggested that the differences in the locations are mainly caused by the isoprenyl sidechain rather than the headgroup quinone-to-quinol reduction during electron transport. This study presents evidence that suggests the influence of the headgroup drives the movement of the oxidized quinone and the reduced hydroquinone to different locations within the interface. Utilizing the model membranes of microemulsions and Langmuir monolayers, it is determined whether or not there is a difference in the location of menadione and menadiol within the interface. Based on our findings, we conclude that the menadione and menadiol may reside in different locations within model membranes. It follows that if menaquinone moves within the cell membrane upon menaquinol formation, it is due at least in part, to the differences in the properties of headgroup interactions with the membrane in addition to the isoprenyl sidechain.
8

Gallop, Jennifer L., and Harvey T. McMahon. "BAR domains and membrane curvature: bringing your curves to the BAR." Biochemical Society Symposia 72 (January 1, 2005): 223–31. http://dx.doi.org/10.1042/bss0720223.

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BAR (bin, amphiphysin and Rvs161/167) domains are a unique class of dimerization domains, whose dimerization interface is edged by a membrane-binding surface. In its dimeric form, the membrane-binding interface is concave, and this gives the ability to bind better to curved membranes, i.e. to sense membrane curvature. When present at higher concentrations, the domain can stabilize membrane curvature, generating lipid tubules. This domain is found in many contexts in a wide variety of proteins, where the dimerization and membrane-binding function of this domain is likely to have a profound effect on protein activity. If these proteins function as predicted, then there will be membrane subdomains based on curvature, and thus there is an additional layer of compartmentalization on membranes. These and other possible functions of the BAR domain are discussed.
9

Handa, Tetsurou. "Lipid Risk Factors and Colloid & Interface Science." membrane 29, no. 4 (2004): 202–9. http://dx.doi.org/10.5360/membrane.29.202.

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10

Endo, Shinji, Toshio Kondo, and Tomoaki Nishmura. "Interface Evaluation Using Surface Plasmon Resonance Measurement Method." MEMBRANE 30, no. 2 (2005): 116–20. http://dx.doi.org/10.5360/membrane.30.116.

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Статті в журналах Дисертації Книги

Дисертації з теми "Interface membrane":

1

Britt, Hannah Mary. "Reactivity at the membrane interface." Thesis, Durham University, 2018. http://etheses.dur.ac.uk/12787/.

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Modulation of internal environment and maintenance of cellular structure and stability are basic requirements to ensure cell survival. These cellular functions are provided by the cell outer membrane, a phospholipid bilayer characterised by the fluid mosaic model. Chemical reactivity at the membrane interface has previously been identified between phospholipids and membrane binding species. Observed reactivity, termed intrinsic lipidation, involves non-enzymatic acyl transfer from phospholipids to a nucleophilic membrane bound molecule. Reactivity has been characterised for membrane active peptides and proteins, and been found influential to the structure and function of both the newly modified species, and the bulk membrane. Research presented within this thesis probes fundamental features of observed intrinsic lipidation reactivity at the membrane interface. This work has expanded upon previous intrinsic lipidation research, facilitated by the development of informative and robust analytical techniques for the study of reactivity. Optimised TLC has allowed improved routine high throughput reactivity screening, compared to alternative fluorescence and solution state NMR techniques. Informative analysis and mechanistic understanding of intrinsic lipidation has been achieved through LCMS and solid state NMR analysis. Synthetic protocols for preparation of isotopically labelled 15N small molecules, and 13C phospholipids, has facilitated solid state NMR in particular. Biological relevance of peptide intrinsic lipidation has also been probed to determine the role of reactivity in natural function, and disease induction. Biophysical techniques such as CD and tryptophan fluorescence revealed that solution phase intrinsically lipidated melittin adopts an α-helical structure with central proline kink, in contrast to the random coil of unmodified melittin. Furthermore, at μM concentrations, palmitoylated species were shown to undergo spontaneous micelle formation. Disease related behaviour linked to peptide intrinsic lipidation includes moderate antimicrobial activity, and possible induction of amyloid nucleation. Additionally, this study has identified novel intrinsic lipidation of small molecules in vitro utilising chromatographic and ionisation conditions optimised with synthetically prepared standards. Observed for multiple cationic amphiphilic small molecules, intrinsic lipidation was promoted by primary amines in a hydrophilic environment, due to increased proximity between reactive moieties. Small molecule intrinsic lipidation products were shown to exhibit biological relevance, including spontaneous micelle formation, membrane disruption, and phospholipidosis induction. Pharmaceutical propranolol displayed notable intrinsic lipidation in vitro, and in Hep G2 cell culture. Initial transesterification from membrane phospholipids produced O-acylated propranolol, followed by secondary N-acylated propranolol formation by intramolecular O to N migration. Study of propranolol reactivity has revealed preferential eukaryotic transfer from the sn-1 phospholipid backbone position, and reaction kinetics influenced by temperature, pH, and membrane composition.
2

Luo, Yuzhong. "Membrane extraction with a sorbent interface." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq38251.pdf.

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3

Danial, John Shokri Hanna. "Imaging lipid phase separation on droplet interface bilayers." Thesis, University of Oxford, 2015. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.711943.

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4

Ge, Changrong. "Property-controlling Enzymes at the Membrane Interface." Doctoral thesis, Stockholms universitet, Institutionen för biokemi och biofysik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-61988.

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Monotopic proteins represent a specialized group of membrane proteins in that they are engaged in biochemical events taking place at the membrane interface. In particular, the monotopic lipid-synthesizing enzymes are able to synthesize amphiphilic lipid products by catalyzing two biochemically distinct molecules (substrates) at the membrane interface. Thus, from an evolutionary point of view, anchoring into the membrane interface enables monotopic enzymes to confer sensitivity to a changing environment by regulating their activities in the lipid biosynthetic pathways in order to maintain a certain membrane homeostasis. We are focused on a plant lipid-synthesizing enzyme DGD2 involved in phosphate shortage stress, and analyzed the potentially important lipid anchoring segments of it, by a set of biochemical and biophysical approaches. A mechanism was proposed to explain how DGD2 adjusts its activity to maintain a proper membrane. In addition, a multivariate-based bioinformatics approach was used to predict the lipid-binding segments for GT-B fold monotopic enzymes. In contrast, a soluble protein Myr1 from yeast, implicated in vesicular traffic, was also proposed to be a membrane stress sensor as it is able to exert different binding properties to stressed membranes, which is probably due to the presence of strongly plus-charged clusters in the protein. Moreover, a bacterial monotopic enzyme MGS was found to be able to induce massive amounts of intracellular vesicles in Escherichia coli cells. The mechanisms involve several steps: binding, bilayer lateral expansion, stimulation of lipid synthesis, and membrane bending. Proteolytic and mutant studies indicate that plus-charged residues and the scaffold-like structure of MGS are crucial for the vesiculation process. Hence, a number of features are involved governing the behaviour of monotopic membrane proteins at the lipid bilayer interface.
At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 3: Manuscript. Paper 5: Manuscript.
5

Co, Carl. "N-WASP at the membrane-actin interface." Diss., Search in ProQuest Dissertations & Theses. UC Only, 2007. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3251943.

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6

Lindahl, Erik. "Computational Modeling of Biological Membrane and Interface Dynamics." Doctoral thesis, Stockholm : Tekniska högsk, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3141.

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7

Hwang, William. "Droplet interface bilayers for the study of membrane proteins." Thesis, University of Oxford, 2008. http://ora.ox.ac.uk/objects/uuid:0ba680ba-75f1-4cd9-9600-3e251b948a3d.

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Aqueous droplets submerged in an oil-lipid mixture become enclosed by a lipid monolayer. The droplets can be connected to form robust networks of droplet interface bilayers (DIBs) with functions such as a biobattery and a light sensor. The discovery and characterization of an engineered nanopore with diode-like properties is enabling the construction of DIB networks capable of biochemical computing. Moreover, DIB networks might be used as model systems for the study of membrane-based biological phenomena. We develop and experimentally validate an electrical modeling approach for DIB networks. Electrical circuit simulations will be important in guiding the development of increasingly complex DIB networks. In cell membranes, the lipid compositions of the inner and outer leaflets differ. Therefore, a robust model system that enables single-channel electrical recording with asymmetric bilayers would be very useful. Towards this end, we incorporate lipid vesicles of different compositions into aqueous droplets and immerse them in an oil bath to form asymmetric DIBs (a-DIBs). Both α-helical and β-barrel membrane proteins insert readily into a-DIBs, and their activity can be measured by single-channel electrical recording. We show that the gating behavior of outer membrane protein G (OmpG) from Escherichia coli differs depending on the side of insertion in an asymmetric DIB with a positively charged leaflet opposing a negatively charged leaflet. The a-DIB system provides a general platform for studying the effects of bilayer leaflet composition on the behavior of ion channels and pores. Even with the small volumes (~100 nL) that can be used to form DIBs, the separation between two adjacent bilayers in a DIB network is typically still hundreds of microns. In contrast, dual-membrane spanning proteins require the bilayer separation to be much smaller; for example, the bilayer separation for gap junctions must be less than 5 nm. We designed a double bilayer system that consists of two monolayer-coated aqueous spheres brought into contact with each side of a water film submerged in an oil-lipid solution. The spheres could be brought close enough together such that they physically deflected without rupturing the double bilayer. Future work on quantifying the bilayer separation and studying dual-membrane spanning proteins with the double bilayer platform is planned.
8

Franz, João Paulo Vicentini. "Interface : a projeção como membrana semipermeável." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2018. http://hdl.handle.net/10183/184850.

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A pesquisa "Interface: a projeção como membrana semipermeável" aborda um processo de criação artística que teve origem no início do ano de 2011. Os trabalhos, pensados inicialmente como vídeos, pelos quais foi experimentado romper com a estrutura narrativa do cinema tradicional, foram modificando-se no decorrer da pesquisa, desse modo, abrangendo o olhar sobre a instalação que continha o vídeo e a projeção. Passou-se, então, a explorar diferentes situações de apresentação espacial nas instalações propostas, muitas vezes, utilizando recursos computacionais de modelagem projetiva como suavização das áreas de projeção, delimitação da abrangência projetiva e inserção de múltiplos vídeos, bem como experimentou-se com interferências nas projeções. Para refletir sobre os trabalhos desenvolvidos, partiu-se de alguns artistas e autores que discutem o espaço de exposição e como o observador relaciona-se com ele, como Thommas Zummer, Andre Parente, Malcom Le Grice e Philippe Dubois. Mediante os conceitos de projeção, interface e membrana – abordados sob diferentes perspectivas do conhecimento – considerou-se o espaço de instalação em uma relação multidirecional entre o observador e o espaço de exposição.
The research, "Interface: projection as semipermeable membrane", approaches a process of artistic creation that originated in the beginning of 2011. The works, initially thought as videos, by which it was tried to break with the narrative structure of traditional cinema, were modified in the course of the research, thus covering the view on the installation that contained the video and the projection. Then proceeded to explore different spatial presentation situations in the proposed installations, often using computational resources of projective modeling such as smoothing projection areas, delimiting the projective range and inserting multiple videos, as well as experimenting with interferences projections. In order to reflect on the work developed, it was used some artists and authors who discuss the exhibition space and how the observer relates to him, such as Thommas Zummer, Andre Parente, Malcolm Le Grice and Philippe Dubois. Through the concepts of projection, interface and membrane - approached from different perspectives of knowledge - the installation space was considered in a multidirectional relation between the observer and the exhibition space.
9

Danial, John Shokri Hanna. "Imaging lipid phase separation in droplet interface bilayers." Thesis, University of Oxford, 2015. https://ora.ox.ac.uk/objects/uuid:34bb015f-2bc1-43bb-bc29-850e0b55edac.

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The spatiotemporal organization of membrane proteins is implicated in cellular trafficking, signalling and reception. It was proposed that biological membranes partition into lipid rafts that can promote and control the organization of membrane proteins to localize the mentioned processes. Lipid rafts are thought to be transient (microseconds) and small (nanometers), rendering their detection a challenging task. To circumvent this problem, multi-component artificial membrane systems are deployed to study the segregation of lipids at longer time and length scales. In this thesis, multi-component Droplet Interface Bilayers (DIBs) were imaged using fluorescence and interferometric scattering microscopy. DIBs were used to examine and manipulate microscopic lipid domains and to observe, for the first time, transient nanoscopic lipid domains. The techniques and results described here will have important implications on future research in this field.
10

Foster, Simon Edward. "Routes to interfacial deposition of platinum microparticles in solid polymer fuel cells." Thesis, Loughborough University, 1998. https://dspace.lboro.ac.uk/2134/28053.

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Книги з теми "Interface membrane":

1

Kaushik, Nag, ed. Structure and dynamics of membranous interfaces. Hoboken, N.J: Wiley, 2008.

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2

Kaushik, Nag, ed. Structure and dynamics of membranous interfaces. Hoboken, N.J: Wiley, 2008.

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3

D, Beysens, Boccara Nino, Forgács G, and Centre de physique des Houches, eds. Dynamical phenomena at interfaces, surfaces and membranes. Commack, N.Y: Nova Science Publishers, 1993.

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4

Safran, Samuel A. Statistical thermodynamics of surfaces, interfaces, and membranes. Reading, Mass: Addison-Wesley Pub., 1994.

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5

Norde, Willem. Colloids and interfaces in life sciences. New York: Marcel Dekker, 2003.

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6

Norde, Willem. Colloids and interfaces in life sciences. Monticello, N.Y: Marcel Dekker, 2003.

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7

1935-, Baszkin Adam, and Norde Willem 1944-, eds. Physical chemistry of biological interfaces. New York: M. Dekker, 2000.

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8

Kontturi, Kyösti. Ionic transport processes: In electrochemistry and membrane science. New York: Oxford University Press, 2008.

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9

Kralchevsky, Peter A. Particles at fluids interfaces and membranes: Attachment of colloid particles and proteins to interfaces and formation of two-dimensional arrays. Amsterdam: Elsevier, 2001.

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10

Just, Ernest Everett. The biology of the cell surface. New York: Garland Pub., 1988.

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Частини книг з теми "Interface membrane":

1

Kirkilionis, Markus, Mirela Domijan, Martin Eigel, Erwin George, Mike Li, and Luca Sbano. "A Definition of Cellular Interface Problems." In Membrane Computing, 36–62. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-95885-7_4.

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Knytl, Vladislav. "Tool II: Membrane Interface Probe." In Advanced Nano-Bio Technologies for Water and Soil Treatment, 619–24. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-29840-1_31.

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Martínez-Herrera, Sayra Cecilia, Axel Castro-Abrego, Daniela Ávila-Gónzalez, Omar Martínez-Alarcon, Anayansi Molina-Hérnandez, Héctor Flores-Herrera, Carlos Alberto Grullón-Bisonó, and Guadalupe García-López. "Obtaining Tissues of Human Amniotic Membrane and Identification of Pluripotent Markers." In Maternal Placental Interface, 163–70. New York, NY: Springer US, 2024. http://dx.doi.org/10.1007/978-1-0716-3746-3_15.

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Bavi, Navid, Yury A. Nikolaev, Omid Bavi, Pietro Ridone, Adam D. Martinac, Yoshitaka Nakayama, Charles D. Cox, and Boris Martinac. "Principles of Mechanosensing at the Membrane Interface." In Springer Series in Biophysics, 85–119. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-6244-5_4.

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Halfter, Willi, J. Sebag, and Emmett T. Cunningham. "II.E. Vitreoretinal Interface and Inner Limiting Membrane." In Vitreous, 165–91. New York, NY: Springer New York, 2014. http://dx.doi.org/10.1007/978-1-4939-1086-1_11.

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6

Pleiner, H., and J. L. Harden. "Hydrodynamic Modes of a Viscoelastic Membrane or Interface." In Springer Proceedings in Physics, 291–94. Berlin, Heidelberg: Springer Berlin Heidelberg, 1992. http://dx.doi.org/10.1007/978-3-642-84763-9_56.

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Findlay, Heather E., Nicola J. Harris, and Paula J. Booth. "Integrating Membrane Transporter Proteins into Droplet Interface Bilayers." In Methods in Molecular Biology, 31–41. New York, NY: Springer US, 2021. http://dx.doi.org/10.1007/978-1-0716-1468-6_2.

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Morone, Nobuhiro. "Freeze-Etch Electron Tomography for the Plasma Membrane Interface." In Immunoelectron Microscopy, 275–86. Totowa, NJ: Humana Press, 2010. http://dx.doi.org/10.1007/978-1-60761-783-9_22.

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Kuroda, Osami, Hiroshige Seto, Takayuki Narita, Michio Yamanaka, and Yushi Oishi. "Liposome Deformation by Imbalance of pH and Ionic Strength Across the Membrane." In Trends in Colloid and Interface Science XXIV, 49–53. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-19038-4_9.

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Ma, Victor, Heather Lord, Melissa Morley, and Janusz Pawliszyn. "Application of Membrane Extraction with Sorbent Interface for Breath Analysis." In Methods in Molecular Biology, 451–68. Totowa, NJ: Humana Press, 2009. http://dx.doi.org/10.1007/978-1-60327-029-8_27.

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Тези доповідей конференцій з теми "Interface membrane":

1

Brahmbhatt, Khushboo, Wujun Zhao, Zhaojie Deng, Leidong Mao, and Eric Freeman. "Magnetically Responsive Droplet Interface Bilayer Networks." In ASME 2015 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/smasis2015-9029.

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This work explores incorporating ferrofluids with droplet interface bilayer (DIB) membranes. Ferrofluids contain magnetic nanoparticles in solution with a stabilizing surfactant, providing a magnetically-responsive fluid. These fluids allow for remote mechanical manipulation of ferrofluid droplets through magnetic fields, and will allow for better control over the characteristics of networks of stimuli-responsive cellular membranes created through by DIB technique. This work involves several phases. First, a suitable biocompatible ferrofluid is synthesized, containing a neutral pH and a biocompatible surfactant. Once a proper ferrofluid is identified, it is tested as the aqueous phase for the creation of DIB membranes. Interfacial membranes between ferrofluid droplets are created and compared to non-ferrofluid DIB membranes. The interfacial membrane between two ferrofluid droplets was tested for leakage and stability, and the electrical characteristics of the interfacial membrane were studied and compared to non-ferrofluid DIB membranes. Once it is confirmed that the ferrofluid droplets do not negatively interfere with the formation of the artificial cellular membranes through the electrical measurements, the magnetically-responsive nature of the ferrofluid droplets are used to form large networks of DIB membranes through a simple magnetic field. These networks are easy to assemble and may be remotely manipulated, providing a significant step towards the rapid and simple assembly of DIB networks advancing towards the tissue scale.
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Sricharoen, Kittikun, Said Abdu, John Erik Wong, Thomas Melin, and Matthias Wessling. "Interface Modification to Enhance Bipolar Membrane Performance." In 14th Asia Pacific Confederation of Chemical Engineering Congress. Singapore: Research Publishing Services, 2012. http://dx.doi.org/10.3850/978-981-07-1445-1_360.

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3

Romero, T., and W. Me´rida. "Transient Water Transport in Nafion Membranes Under Activity Gradients." In 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.
4

Taylor, Graham, Donald Leo, and Andy Sarles. "Detection of Botulinum Neurotoxin/A Insertion Using an Encapsulated Interface Bilayer." In ASME 2012 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/smasis2012-8101.

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Many signaling mechanisms in living cells occur at biological boundaries via cell surface receptors and membrane proteins embedded in lipid bilayers. The coordination of actions of sensory and motor neurons in the nervous system represents one example of many that heavily depends on lipid membrane bound receptor mediated signaling. As a result, chemical and biological toxins that disrupt these neural signals can have severe physiological effects, including paralysis and death. Botulinum neurotoxin Type A (BoNT/A) is a proteolytic toxin that inserts through vesicle membranes and cleaves membrane receptors involved with synaptic acetylcholine uptake and nervous system signal conduction. In this work, we investigate the use of a Bioinspired liquid-supported interface bilayer for studying the insertion of BoNT/A toxin molecules into synthetic lipid bilayers. DPhPC lipid bilayers are formed using the regulated attachment method (RAM), as developed by Sarles and Leo, and we perform current measurements on membranes exposed to BoNT/A toxin to characterize activity of toxin interacting with the synthetic bilayer. Control tests without toxin present are also presented. The results of these tests show an increase in the magnitude of current through the bilayer when the toxin is included. We interpret these initial results to mean that incorporation of BoNT/A toxin at a high concentration in an interface bilayer increases the permeability of the membrane as a result of toxin molecules spanning the thickness of the bilayer.
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Nguyen, Mary-Anne, and Stephen A. Sarles. "Microfluidic Generation, Encapsulation and Characterization of Asymmetric Droplet Interface Bilayers." In ASME 2016 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/smasis2016-9034.

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Our research focuses on creating smart materials that utilize synthetic cell membranes assembled at liquid interfaces for autonomic sensing, actuation, and energy conversion. Unlike single membrane assemblies, systems featuring many membranes have the potential to offer multi-functionality, greater transduction sensitivity, and even emergent behaviors in response to environmental stimuli, similar to living tissue, which utilizes networks of highly packed cells to accomplish tasks. Here, we present for the first time a novel microfluidic platform capable of generating a stream of alternating droplet compositions, i.e. A-B-A-B, and sequentially capturing these droplets in precise locations to enable the spontaneous formation of synthetic lipid bilayers between droplets of different compositions (i.e. A and B) in an enclosed substrate. This platform preserves a key feature of the droplet interface bilayer (DIB) method, which allows asymmetric conditions within and across the membrane to be prescribed by simply using droplets containing different species. In this work, we demonstrate the ability to assemble bilayers consisting of asymmetric lipid compositions and, separately, show that alternating droplets containing the same lipid type can also be used to control the direction of ion channel insertion. In the first study, A and B droplet types contain liposomes comprised of different lipid types, which are used to establish an asymmetric composition of the leaflets that make up the lipid bilayer. This asymmetry results in a dc, non-zero membrane potential, which we measure via membrane capacitance versus bias voltage. In the second study, alamethicin peptides are included in only one of the droplet types, which enable voltage-dependent insertion to occur only at one polarity. Cyclic voltammetry measurements are performed to confirm the direction of insertion of alamethicin channels in bilayers. Also, these results show the ability to perform simultaneously electrical measurements on multiple DIB, which increases the experimental capacity and efficiency of a microfluidic approach. The ability to produce alternating droplets in a high throughput manner with electrical access provides a system to investigate the effects of lipid asymmetry on the function of membrane proteins in a controlled model system.
6

Creasy, M. Austin, and Donald J. Leo. "Non-Invasive Measurement Techniques for Measuring Bilayers in Droplet-Interface-Bilayers." In ASME 2009 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. ASMEDC, 2009. http://dx.doi.org/10.1115/smasis2009-1321.

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Phospholipids and membrane proteins are two of the fundamental building blocks of cell membranes in living organisms. These molecules are amphipathic and synthetic membranes made of phospholipids, called bilayer lipid membranes (BLMs), are used to understand the characteristics of a cell membrane. Studies of these BLMs have been performed on both solid support and liquid support systems. A droplet interface bilayer (DIB) is a liquid support system where a monolayer is formed around a water droplet placed in oil and a bilayer is formed when two of these droplets are placed in contact. For impedance measurements, electrodes are placed in the water on each side of the bilayer. The measurements first insure there is a bilayer and second to obtain information about the bilayer. In a DIB system the electrodes pierce the monolayer surrounding the droplet causing instabilities in the monolayer. This study focuses on a non-invasive technique for measuring the bilayer by using the electrodes to contact the monolayer around the droplets and take impedance measurements without piercing the monolayer.
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Shapiro, E., D. Drikakis, J. Gargiuli, and P. Vadgama. "Microfluidic Cell Optimization for Polymer Membrane Fabrication." In ASME 4th International Conference on Nanochannels, Microchannels, and Minichannels. ASMEDC, 2006. http://dx.doi.org/10.1115/icnmm2006-96221.

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Dual-fluid laminar flow in microchannels can be utilised through microfabrication to create polymer membranes at the interface between aqueous and organic solutions. In order to enable smooth membrane growth it is necessary not only to maintain a stable interface between the aqueous and organic phase, but also to minimise near-wall stresses, which affect membrane attachment at the initial stages of membrane formation. The characteristics of the dual-fluid flow in the entrance region of the micro-channel can be significantly affected by the geometry of the inlet and flow rates involved. We present a numerical study of the effects of the inlet geometry on the flow development and near-wall stresses in xylene/water flows, which represent the initial stages of nylon 6,6 membrane formation on the interface between an aqueous solution of hexamethylenediamine and adipoyl chloride solution in xylene. The shape of the inlets considered here varies from a T-inlet (90 degrees inlet angles) to an M-inlet (0 degrees inlet angles). We show that although higher flow rates are needed in order to contain reagents to the narrow region near the interface, the increase of the flow rate leads to significant increase of the shear stresses with the maximum values being obtained in the entrance region thus preventing membrane attachment. CFD validation against experimental data for rhodamine diffusion broadening in a microfluidic is also presented.
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Makhoul-Mansour, Michelle, Elio J. Challita, and Eric C. Freeman. "Chain Failure Events in Microfluidic Membrane Networks." In ASME 2016 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/smasis2016-9143.

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Multiple lipid encased water droplets may be linked together in oil to form large networks of droplet interface bilayers thus creating a new class of stimuli-responsive materials for applications in sensing, actuation, drug delivery, and tissue engineering. While single droplet interface bilayers have been extensively studied, comparatively little is known about their interaction in large networks. One particular problem of interest is understanding the impact of the coalescence of two neighboring droplets on the overall structural integrity of the network. Here, we propose a computational modeling scheme that predicts and characterizes the mechanical properties of the multiple lipid bilayer interfaces within the droplet network upon intentional coalescence of adjacent droplets. Droplet networks with tailored architectures are synthesized with the aid of magnetic motor droplets containing a biocompatible ferrofluid. The equilibrium configuration of the droplet networks is compared to computational prediction which defines the overall stability by summing the interfacial energies. Once the networks are completed, failure in selected membranes is induced. As the targeted droplets coalesce together, the equilibrium structure of the network is altered and the remaining droplets may shift to new configurations dictated by their minimized mechanical energies.
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Kancharala, Ashok K., Eric Freeman, and Michael K. Philen. "Energy Harvesting From Droplet Interface Bilayers." In ASME 2015 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/smasis2015-9107.

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Biologically inspired droplet interface bilayers have found applications in the development of hair cell sensors and other mechanotransduction applications. In this research, the flexoelectric capability of the droplet bilayers under external excitation is explored for energy harvesting. Traditionally, membrane capacitance models are being used for inferring the magnitude of the membrane deflection which do not account for the relation between the applied force or deflection and the deflection of the interfacial membrane and time dependent variations. In this work, the dynamic behavior of the droplets under external excitation has been modeled using nonlinear finite element analysis. A flexoelectric model including mechanical, electrical, and chemical sensitivities has been developed and coupled with the calculated bilayer deformations to predict the mechanotransductive response of the droplets under excitation. Using the developed framework, the possibilities of energy harvesting for different droplet configurations have been investigated and reported.
10

El-Beyrouthy, Joyce, and Eric C. Freeman. "Rapid and Real-Time Measurement of Membrane Potential Through Intramembrane Field Compensation." In ASME 2020 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/smasis2020-2352.

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Abstract Synthetic lipid membranes are self-assembled biomolecular double layers designed to approximate the properties of living cell membranes. These membranes are employed as model systems for studying the interactions of cellular envelopes with the surrounding environment in a controlled platform. They are constructed by dispersing amphiphilic lipids into a combination of immiscible fluids enabling the biomolecules to self-assemble into ordered sheets, or monolayers at the oil-water interface. The adhesion of two opposing monolayer sheets forms the membrane, or the double layer. The mechanical properties of these synthetic membranes often differ from biological ones mainly due to the presence of residual solvent in between the leaflets. In fact, the double layer compresses in response to externally applied electrical field with an intensity that varies depending on the solvent present. While typically viewed as a drawback associated with their assembly, in this work the elasticity of the double layer is utilized to further quantify complex biophysical phenomena. The adsorption of charged molecules on the surface of a lipid bilayer is a key property to decipher biomolecule interactions at the interface of the cell membrane, as well as to develop effective antimicrobial peptides and similar membrane-active molecules. This adsorption generates a difference in the boundary potentials on either side of the membrane which may be tracked through electrophysiology. The soft synthetic membranes produced in the laboratory compress when exposed to an electric field. Tracking the minimum membrane capacitance allows for quantifying when the intrinsic electric field produced by the asymmetry is properly compensated by the supplied transmembrane voltage. The technique adopted in this work is the intramembrane field compensation (IFC). This technique focuses on the current generated by the bilayer in response to a sinusoidal voltage with a DC component, VDC. Briefly, the output sinusoidal current is divided into its harmonics and the second harmonic equals zero when VDC compensates the internal electric field. In this work, we apply the IFC technique to droplet interface bilayers (DIB) enabling the development of a biological sensor. A certain membrane elasticity is needed for accurate measurements and is tuned through the solvent selection. The asymmetric DIBs are formed, and an automated PID-controlled IFC design is implemented to rapidly track and compensate the membrane asymmetry. The closed loop system continuously reads the current and generates the corresponding voltage until the second harmonic is abated. This research describes the development and optimization of a biological sensor and examines how varying the structure of the synthetic membrane influences its capabilities for detecting membrane-environment interactions. This platform may be applied towards studying the interactions of membrane-active molecules and developing models for the associated phenomena to enhance their design.

Звіти організацій з теми "Interface membrane":

1

Yang, Gaoqiang. Structured Membrane-electrode Interface for Highly Efficient PEM Fuel Cell. Office of Scientific and Technical Information (OSTI), March 2021. http://dx.doi.org/10.2172/1772382.

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2

Vangelas, K. M. Plume Delineation Using Membrane Interface Probe Savannah River Site Aiken, South Carolina. Office of Scientific and Technical Information (OSTI), May 2003. http://dx.doi.org/10.2172/811367.

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3

Mukerjee, Sanjeev, Ian Kendrick, Serge Pann, Qingying Jia, Yushan Yan, Santiago Rojas-Carbonell, Emory De Castro, and Ryan Pavlicek. Enabling Efficient Water Splitting with Advanced Materials Designed for High pH Membrane Interface. Office of Scientific and Technical Information (OSTI), September 2021. http://dx.doi.org/10.2172/1963502.

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4

Schmidt, Piet. Origins of Effective Charge of Multivalent Ions at a Membrane/Water Interface and Distribution of 2,3,4,5-Tetrachlorophenol in a Membrane Model System. Portland State University Library, January 2000. http://dx.doi.org/10.15760/etd.6925.

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5

Jennings, G. Kane. Surface-Directed Fabrication of Integrated Membrane-Electrode Interfaces. Office of Scientific and Technical Information (OSTI), December 2013. http://dx.doi.org/10.2172/1108612.

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6

Sieder, Isolde. Electrostatic Interactions at Membrane-water Interfaces and Distribution of 2, 4, 6-Trichlorophenol in a Membrane Model System. Portland State University Library, January 2000. http://dx.doi.org/10.15760/etd.6963.

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7

Woods, Jason. Modeling Water Vapor Transport at Liquid/Membrane Interfaces for Applications in Liquid Desiccant Air Conditioners: Cooperative Research and Development Final Report, CRADA Number CRD-17-679. Office of Scientific and Technical Information (OSTI), July 2020. http://dx.doi.org/10.2172/1659994.

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8

Blumwald, Eduardo, and Avi Sadka. Sugar and Acid Homeostasis in Citrus Fruit. United States Department of Agriculture, January 2012. http://dx.doi.org/10.32747/2012.7697109.bard.

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Citrus fruit quality standards have been determined empirically, depending on species and on the particular growing regions. In general, the TSS (total soluble solids) to total acidity (TA) ratio determines whether citrus fruit can be marketed. Soluble sugars account for most of the TSS during harvest while TA is determined almost solely by the citric acid content, which reaches levels of 1-5% by weight in many cultivated varieties. Acid and sugar homeostasis in the fruit is critical for the management of existing cultivars, the development of new cultivars, the improvement of pre- and post-harvest strategies and the control of fruit quality and disorders. The current proposal (a continuation of a previous proposal) aimed at: (1) completing the citrus fruit proteome and metabolome, and establish a citrus fruit functional database, (2) further characterization of the control of fruit acidity by studying the regulation of key steps affecting citrate metabolism, and determine the fate of citrate during acid decline stage, and (3) Studying acid and sugar homeostasis in citrus fruits by characterizing transport mechanisms across membranes. These aims were completed as the following: (1) Our initial efforts were aimed at the characterization and identification of citric acid transporters in citrus juice cells. The identification of citrate transporters at the vacuole of the citrus juice cell indicated that the steady-state citrate cytosolic concentration and the action of the cytosolic aconitase were key elements in establishing the pH homeostat in the cell that regulates the metabolic shift towards carbon usage in the fruit during the later stages of fruit development. We focused on the action of aconitase, the enzyme mediating the metabolic use of citric acid in the cells, and identified processes that control carbon fluxes in developing citrus fruits that control the fruit acid load; (2) The regulation of aconitase, catalyzing a key step in citrate metabolism, was further characterized by using two inhibitors, citramalte and oxalomalte. These compounds significantly increased citrate content and reduced the enzyme’s activity. Metabolite profiling and changes of amino-acid metabolizing enzymes in oxalomalate- treated cells suggested that the increase in citrate, caused by aconitase inhibition, induces amino acid synthesis and the GABA shunt, in accordance with the suggested fate of citrate during the acid decline stage in citrus fruit. (3) We have placed a considerable amount of time on the development of a citrus fruit proteome that will serve to identify all of the proteins in the juice cells and will also serve as an aid to the genomics efforts of the citrus research community (validating the annotation of the fruit genes and the different ESTs). Initially, we identified more than 2,500 specific fruit proteins and were able to assign a function to more than 2,100 proteins (Katz et al., 2007). We have now developed a novel Differential Quantitative LC-MS/MS Proteomics Methodology for the identification and quantitation of key biochemical pathways in fruits (Katz et al., 2010) and applied this methodology to identify determinants of key traits for fruit quality (Katz et al., 2011). We built “biosynthesis maps” that will aid in defining key pathways associated with the development of key fruit quality traits. In addition, we constructed iCitrus (http://wiki.bioinformatics.ucdavis.edu/index.php/ICitrus), a “functional database” that is essentially a web interface to a look-up table that allows users to use functional annotations in the web to identify poorly annotated citrus proteins. This resource will serve as a tool for growers and field extension specialists.

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