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Dissertations / Theses on the topic 'Potassiumm'

Author: Grafiati

Published: 5 June 2025

Last updated: 1 August 2025

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1

Canadell, i. Sala David. "Potassium starvation responses in yeast highlight novel potassium-related functions." Doctoral thesis, Universitat Autònoma de Barcelona, 2015. http://hdl.handle.net/10803/298180.

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Mantenir la homeòstasis de cations és essencial per la supervivència dels éssers vius, i en especial pels organismes unicel·lulars. El llevat Saccharomyces cerevisiae s’ha utilitzat al llarg dels anys com un organisme model per l’estudi del conjunt de processos que controlen els nivells intracel·lulars de cations. El potassi és el principal catió intracel·lular del llevat i està involucrat en diversos processos de la fisiologia d'aquest organisme. Per aquest motiu la seva homeòstasis està minuciosament controlada per un seguit de transportadors que permeten la seva captació, distribució intrac

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2

Young, Bradford Kenneth Guertal Elizabeth A. "Potassium movement and uptake as affected by potassium source and placement." Auburn, Ala, 2009. http://hdl.handle.net/10415/1575.

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3

Bailey, Matthew Alexander. "Studies in renal cation transport in potassium replete and potassium-depleted rats." Thesis, Imperial College London, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.264703.

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4

Alfaro, Marta Andrea. "Potassium balances in grassland systems : does nitrogen affect potassium cycling and leaching?" Thesis, University of Reading, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.252256.

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5

Lee, Kai-lok. "The contribution of KATP channels to potassium release into the interstitial space during skeletal muscle contractions /." View the Table of Contents & Abstract, 2007. http://sunzi.lib.hku.hk/hkuto/record/B38347647.

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6

Salomon, Eva. "Availability of potassium to clover and grass from soils with different potassium fertilization histories /." Uppsala : Swedish Univ. of Agricultural Sciences (Sveriges lantbruksuniv.), 1999. http://epsilon.slu.se/avh/1999/91-576-5459-X.pdf.

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7

Stansfield, Phillip James. "Molecular modelling of potassium channels." Thesis, University of Leicester, 2007. http://hdl.handle.net/2381/29963.

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This study uses the structural coordinates of the determined K+ channels to create comparative models of three diverse members of this family, with the aim of enabling a better understanding of the function of these channels. The K+ channel of primary interest is the hERG K+ channel. The pharmacology of this channel is of considerable interest as serendipitous block of K+ conduction pore may result in cardiac arrest. A set of known antagonists have been docked into novel comparative models of hERG to propose how these drugs interact with the channel. The models have also been subjected to mole

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8

Chan, Brenda Kit Ching. "Reaction of potassium with carbons." Thesis, University of Newcastle Upon Tyne, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.316091.

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9

Viriyatum, Rawee Boyd Claude E. "Potassium fertilization of bluegill ponds." Auburn, Ala., 2009. http://hdl.handle.net/10415/1940.

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10

Podesta, M. de. "Helicon wave studies in potassium." Thesis, University of Sussex, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.370431.

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11

Karnik, Rucha. "Trafficking motifs in potassium channels." Thesis, University of Leeds, 2010. http://etheses.whiterose.ac.uk/1364/.

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The pancreatic ATP-sensitive potassium (KATP) channels couple glucose metabolism to excitability of the pancreatic β-cells to regulate insulin secretion. The channel subunits, Kir6.2 and SUR1, are encoded by the KCNJ11 and ABCC8 genes respectively. Genetic polymorphisms in these genes, which reduce channel activity, cause congenital hyperinsulinism (CHI) characterized by insulin hyper-secretion and hypoglycemia. The hERG (human ether-a-go-go related gene) potassium channels,encoded by the KCNH2 gene, contribute to the rapidly activating delayed rectifier K+ current (IKr), which is responsible

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12

Alexander, Sian. "Modulation of voltage-gated potassium channels: a pathophysiological mechanism of potassium channel antibodies in limbic encephalitis?" Thesis, University of Oxford, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.487139.

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Limbic encephalitis (LE) is a central nervous system disorder that is characterised by memory impairments, confusion, agitation and seizures, and associated with hyperintense lesions of the medial temporal lobe, seen with MRI. Anti-voltage-gated potassium channel (VOKC) antibodies have been been detected in the plasma of a subset of LE patients using a 125I-a-dendrotoxin (a-DTX) radioimmunoprecipitation assay, suggesting that the likely antigens are VOKC Kv1.l, 1.2 and 1.6 subunits. Symptoms of the disease improve markedly with immunosuppression, correlating with similarly dramatic falls in th

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13

Hess, Tanja Maria. "Potassium-free and potassium-containing electrolytes affect plasma ions and acid-base status of endurance horses." Diss., Virginia Tech, 2005. http://hdl.handle.net/10919/26163.

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Effects of potassium supplementation were evaluated in four studies in endurance horses during races and treadmill exercise. In the first and second studies a potassium-free experimental formula was compared to potassium rich commercial formulas. The first study showed that supplementation increased plasma [K+], and that the extra sodium in the potassium-free experimental formulas helped to attenuate acidosis at the end of the ride. In the second study supplementation also increased plasma [K+], however speeds were lower and no increases were observed in plasma concentrations during the rac

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14

Ait, Houssa Abdelhadi. "Contribution à l'étude du potassium dans les sols marocains échantillonnage, normes d'interprétation, étude du potassium échangeable." Grenoble 2 : ANRT, 1986. http://catalogue.bnf.fr/ark:/12148/cb375953692.

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15

Pikros, Léon. "Elaboration d'un sel industriel, le chlorure de potassium : adaptation d'un procédé industriel aux nouvelles contraintes technico-économiques." Mulhouse, 1999. http://www.theses.fr/1999MULH0589.

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L'optimisation de la production industrielle de KCl à partir de sel minier examine successivement : - 1) les aspects liés à la production de sels purs. - 2) les aspects liés aux adjuvants destinés à en éviter la prise en masse. - 3) les aspects liés à la diversification de la production, (assurance qualité, nouvelles formulations en fonction du marché. ). La première partie concerne l'optimisation de l'unité de production de sels purs. Après avoir développé des moyens de mesure appropriés, il a été possible de modéliser l'appareillage existant : un dissolveur, un cristalliseur et un filtre à b

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16

Dewachter, Pascale. "Inhibiteurs calciques, activateurs potassiques et bronchospasme expérimental à l'histamine." Nancy 1, 1995. http://docnum.univ-lorraine.fr/public/SCD_T_1995_0459_DEWACHTER.pdf.

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17

Syeda, Ruhma. "Potassium channels in droplet interface bilayers." Thesis, University of Oxford, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.669989.

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18

Hodge, J. J. L. "Shaw potassium channel genes in Drosophila." Thesis, University of Cambridge, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.604121.

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Potassium (K<SUP>+</SUP>) channels shape the electrical activities of cells by changing the frequency and duration of action potentials and by setting the resting potential. The huge diversity of K<SUP>+</SUP> channels is conserved across species and is thought to be required to uniquely customise both the active excitable and passive properties of different cell types. When this study began, <I>Drosophila</I> voltage-gated K<SUP>+</SUP> currents were thought to be encoded by the four cloned members of this family <I>Shaker, Shab, Shaw </I>and <I>Shal</I>. Mutant analysis had only been perform

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19

Miller, B. A. "Potassium channels in cultured locust muscle." Thesis, University of Nottingham, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.384270.

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20

Walker, David James. "Potassium compartmentation in barley root cells." Thesis, University of Nottingham, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.319644.

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21

Smith, Ruth Deborah. "Potassium intake, growth and energy metabolism." Thesis, University of Southampton, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.295704.

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22

Craighead, Anthea N. "Taxonomic variation of plant potassium concentrations." Thesis, University of Cambridge, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.444740.

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23

Marshall, Peter R. "Potassium promotion of nickel alumina catalysts." Thesis, University of Edinburgh, 1994. http://hdl.handle.net/1842/12572.

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The chemical and physical effects of potassium promotion on prepared nickel-alumina catalysts have been examined using "<I>in-situ</I>" Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS), Temperature Programmed studies and X-ray Powder Diffraction (XRPD). Various preparative methods were explored to obtain catalyst samples with a high metallic surface area. A sequential precipitation technique was employed, yielding a highly loaded nickel alumina catalyst (56 %wt Ni) with the hydrotalcite structure, typical of other industrial catalysts. Subsequent potassium promotion of this

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24

Rasol, Hepa. "Influence of Potassium on Gasification Performance." Thesis, Högskolan i Borås, Akademin för textil, teknik och ekonomi, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-10350.

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To release energy from chemically stored energy in the biomass was the new investigation in recent years. Utilizing of biomass for this purpose occur in two different ways, directly by burning (combustion) the biomass and indirectly by pyrolysis process which will convert the biomass to three main products, bio- tar, bio- char and synthetic gas. Biomass contains different amount of inorganic compound, especially alkali metals which causes some diverse impacts on combustion, pyrolysis and gasification process such as corrosion, agglomeration and fouling problems. This project aims to investigat

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25

Andrew, S. C. "Potassium homeostasis during intracellular Chlamydia development." Thesis, University College London (University of London), 2014. http://discovery.ucl.ac.uk/1430699/.

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Chlamydia trachomatis is an obligate intracellular bacterium, which is the leading cause of acquired blindness and the most prevalent bacterial sexually transmitted infection worldwide. Chlamydiae exist in two distinct forms. The infectious spore-like elementary bodies (EBs) that invade host cells differentiate into non-infectious reticulate bodies (RBs) that replicate intracellularly within a modified membrane-bound vacuole called the inclusion. Under stress, Chlamydiae can enter a persistent state, in which aberrant bodies (ABs) with reduced metabolic activity are formed. Surprisingly little

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26

Zheng, Jingfeng. "Designing Ionic Polymers for Potassium Batteries." The Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu155508012993124.

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27

Mitchell, William D. "Polarization Reversal in Potassium Titanyl Phosphate." Wright State University / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=wright1194982327.

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28

Wegrzyn, Margaret. "Sodium potassium niobate based piezoelectric ceramics." Thesis, University of Manchester, 2012. https://www.research.manchester.ac.uk/portal/en/theses/sodium-potassium-niobate-based-piezoelectric-ceramics(8f2d3804-5012-4562-8bb0-2b325b754d13).html.

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NKN doped samples, (100-x)NKN-xSBN (0 ≤ x ≤ 10) were produced using the conventional mixed oxide route with 0.45 wt% Fe2O3 sintering aid (xSBNF). After 20-24 hours mixing, samples were calcined at 850°C and sintered at 1100–1140°C (± 180°C/hour) for 4 hours. By XRD 4 mol% SBN was found to be the solubility limit for single phase structure. By SEM, second phases were visible when 2 ≤ x ≤ 4; their structure was subsequently shown to be tungsten bronze type (TBT). 2-4 SBNF samples were high density, over 96% theoretical. For x = 0, TC = 457°C, TO-T = 234°C, Pr = 22 μC/cm2 and EC = 16.5 kV/cm. TC

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29

Unrah, B. L., J. C. Silvertooth, D. M. Hendricks, and J. E. Malcuit. "Potassium Fertility of Several Arizona Soils." College of Agriculture, University of Arizona (Tucson, AZ), 1993. http://hdl.handle.net/10150/209581.

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Potassium (K) fertility requirements for cotton ( Gossypium spp) have been a matter of concern due to increasing interest and emphasis on fiber quality and numerous reports of K deficiencies in various cotton producing regions. To address this matter appropriately, a thorough understanding of the chemical, physical, and mineralogical composition of the soils in question is in order. Soil samples were collected from ten sites across southern Arizona that are representative of the common agricultural soils of the region. At all locations soils were sampled to a depth of 120 cm in 30 cm increment

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30

Hovorkova, Zuzana. "Monitoring of patients prescribed potassium supplements." Thesis, Uppsala universitet, Institutionen för farmaceutisk biovetenskap, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-389654.

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Monitoring of patients prescribed potassium supplements Zuzana Hovorkova Degree Project 30 hp, Pharmacotherapy Department of Pharmaceutical Biosciences/Division of Pharmacokinetics and Drug Therapy Supervisor: Linden Ashfield, Examiner: Margareta Hammarlund-Udenaes Introduction: In Northern Ireland, clinical technicians have been supporting pharmacist in their work in over five decades. From initially having mainly administrative tasks, the role of pharmacy technicians has progressed to more clinical activities. Following recent incidents caused by inadequate monitoring of potassium blood leve

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31

Widman, Lars. "Skeletal muscle potassium and magnesium in diuretic treated patients : effects of potassium - sparing diuretics of magnesium supplementation." Doctoral thesis, Umeå universitet, Medicin, 1988. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-100556.

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32

Lee, Mun Ching. "Regulation of voltage-gated potassium (Kv) and two-pore domain potassium (K2P) channels implicated in pulmonary hypertension." Thesis, University of Kent, 2018. https://kar.kent.ac.uk/67654/.

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Background: Kv2.1 and TASK-1 channels are two main contributors of K+ currents in pulmonary artery smooth muscle cells (PASMC). Dysregulation of these channels has been implicated in the pathogenesis of pulmonary hypertension (PH). This thesis aims to delve deeper into the implications of the regulation of Kv2.1 by Kv9.3 in PH. Another subject of interest would be whether NADPH oxidase type 4 (Nox4), one of the major reactive oxygen species (ROS) producers in the PASMC, modulates Kv2.1, Kv9.3, and TASK-1 channels. The effects of several redox agents are also investigated as potential modulator

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33

Biswas, Sumitra Bose. "Impact of mineralogy on potassium dynamics and retention behavior in Bangladesh soils used in rice cropping systems." Texas A&M University, 2008. http://hdl.handle.net/1969.1/85972.

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The combination of rising population and increasing food demand has placed tremendous pressure on the soil resource in Bangladesh, especially floodplain soils where rice may be grown year round. Although these floodplain soils contain minerals high in potassium (K) such as micas, K deficiency in rice paddy soils is increasing throughout Bangladesh. Harvesting of straw from fields exacerbates the removal of nutrients including K, and intensive cropping with unbalanced fertilizer has resulted in depletion of "readily available" K in large areas. Five representative floodplain soils in rice produ

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34

Choi, Eun Kyung. "Regulation of KCNQ1 potassium channel trafficking and gating by KCNE1 and KCNE3 /." Access full-text from WCMC, 2009. http://proquest.umi.com/pqdweb?did=1692648191&sid=1&Fmt=2&clientId=8424&RQT=309&VName=PQD.

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35

Matz, Jason D. "Correction of potassium deficiency in soybean and corn production in southeast Kansas." Thesis, Kansas State University, 2012. http://hdl.handle.net/2097/13415.

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Master of Science<br>Department of Agronomy<br>David B. Mengel<br>Over the last decade low (< 130 mg kg -1) soil test potassium (K) levels and increased crop K deficiency have become a major concern in the clay-pan soils of southeast Kansas. The use of more intense crop rotations and the increased production of high K extracting crops (e.g. soybeans (Glycine max L.)) has significantly increased K removal from these soils. In addition, the traditional use of the nutrient sufficiency-based fertilizer recommendations has resulted in K application rates being substantially lower than removal r

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36

Lafond-Puyo, Martine. "Les hypokaliémies iatrogènes." Bordeaux 2, 1992. http://www.theses.fr/1992BOR2P098.

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37

Sherstov, Ivan V. "Matter wave interferences of potassium molecules and the influence of collisions with potassium atoms in the ground state." [S.l.] : [s.n.], 2006. http://deposit.ddb.de/cgi-bin/dokserv?idn=981904947.

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38

Zhang, Hailin. "ATP-sensitive potassium channels and their modulation by nucleotides and potassium channel openers in vascular smooth muscle cells." Thesis, St George's, University of London, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.309744.

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39

Genies, Laure. "Etude des transporteurs impliqués dans l’absorption racinaire et la translocation aux parties aériennes du césium chez Arabidopsis thaliana." Thesis, Aix-Marseille, 2017. http://www.theses.fr/2017AIXM0022.

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Le 134Cs et le 137Cs, isotopes radioactifs du césium relâchés entre autres à la suite des accidents de Tchernobyl et Fukushima, sont des sources de préoccupations majeures pour la sécurité sanitaire et la protection des écosystèmes. La contamination des plantes est liée en partie à leur capacité à absorber le césium présent dans la solution du sol via des transporteurs. Le césium emprunte en effet, au moins en partie, le système de transport potassique sans disposer de transporteurs qui lui sont spécifiques. Il existe une grande diversité de transporteurs potassiques et la part du flux total q

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40

Rudbeck, Maria. "Potassium(I) in water from Theoretical Calculations." Thesis, Uppsala University, Department of Mathematics, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-121236.

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41

Bennett, Aline Miriam. "Potential for potassium recovery as K-struvite." Thesis, University of British Columbia, 2015. http://hdl.handle.net/2429/54296.

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Crystallization of NH₄-struvite (MgNH₄PO4:6H₂O) pellets has proven to be a successful method of recovering nitrogen and phosphorus from wastewaters. Thus far, little work has been done on potassium recovery since it is not considered a water pollutant, nor do we face potassium shortages. However, potassium is an essential plant macronutrient and we are seeing worldwide imbalances in nutrient and fertilizer use, as well as a need for a slow release potassium fertilizer. Development of a full complement NPK fertilizer with NH₄-struvite and K-struvite components may have great potential. Given th

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42

Sobek, Joanna Amanda. "Atomic force microscopy studies of potassium channels." Thesis, University of Oxford, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.669955.

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43

Ellis, Lee David. "Potassium channel control of neuronal frequency response." Thesis, McGill University, 2007. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=103381.

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The processing of sensory signals is an important, yet complex task in which a system must extract behaviorally relevant stimulus patterns from a vast array of sensory cues. When a neuron within a major sensory area is presented with a stimulus, one of the important characteristics used to distinguish between types of input is frequency. Often sensory neurons are tuned to narrow stimulus frequency ranges and are thus charged with the processing of subtypes of sensory signals. The weakly electric fish Apteronotus lepthorhynchus senses it's environment through modulations of a self-generated ele

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44

Andres-Enguix, Isabelle. "TASK potassium channels and their anesthetic sensitivity." Thesis, Imperial College London, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.444148.

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45

Clarke, Catherine Elizabeth. "Characterisation of two pore domain potassium channels." Thesis, Imperial College London, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.408808.

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46

Capener, Charlotte E. "Modelling and simulation studies of potassium channels." Thesis, University of Oxford, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.249241.

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47

Khan, Asif Iqbal. "Potassium transport in human red blood cells." Thesis, University of Oxford, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.342545.

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48

Cockcroft, Christopher John. "Expression and Characterisation of Chimeric Potassium Channels." Thesis, University of Leeds, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.494113.

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49

Bethell, H. W. L. "Potassium, acidosis and ventricular repolarisation during ischaemia." Thesis, University of Cambridge, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.596607.

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In the first section the relative severity of the insult produced by low-flow ischaemia was established through a series of experiments monitoring the change in intracellular pH, high energy phosphates and LVDP during zero-flow, low flow (7.5% of the control flow rate) and moderate flow ischaemia (30% of the control flow rate). This established that in terms of mechanical performance and bioenergetic status reducing the flow to 7.5% of the control flow rate produced a significant ischaemic insult. Separate experiments showed that low-flow ischaemia caused action potential duration (APD) shorte

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50

Zhang, Nan. "Phases and Structures of Sodium Potassium Niobate." Thesis, University of Oxford, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.526133.

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