Thematische Bibliographien / Calcium cations divalents

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  1. Zeitschriftenartikel
  2. Dissertationen
  3. Bücher
  4. Buchteile
  5. Konferenzberichte

Auswahl der wissenschaftlichen Literatur zum Thema „Calcium cations divalents“

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Veröffentlicht am 11. Januar 2025

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Zeitschriftenartikel zum Thema "Calcium cations divalents"

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Hess, P., J. B. Lansman, and R. W. Tsien. "Calcium channel selectivity for divalent and monovalent cations. Voltage and concentration dependence of single channel current in ventricular heart cells." Journal of General Physiology 88, no. 3 (1986): 293–319. http://dx.doi.org/10.1085/jgp.88.3.293.

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Single channel and whole cell recordings were used to study ion permeation through Ca channels in isolated ventricular heart cells of guinea pigs. We evaluated the permeability to various divalent and monovalent cations in two ways, by measuring either unitary current amplitude or reversal potential (Erev). According to whole cell measurements of Erev, the relative permeability sequence is Ca2+ greater than Sr2+ greater than Ba2+ for divalent ions; Mg2+ is not measurably permeant. Monovalent ions follow the sequence Li+ greater than Na+ greater than K+ greater than Cs+, and are much less perme
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Kamgaing, Théophile. "Précipitation de carbonates de cations divalents dans les systèmes lacustres : intérêt, état des connaissances des mécanismes et suggestions (Revue critique de la littérature)." Revue des sciences de l’eau 28, no. 2 (2015): 81–102. http://dx.doi.org/10.7202/1032292ar.

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Les carbonates de fer, de manganèse, de calcium et de magnésium précipités en solution des lacs sont documentés. Indicateurs de climat et de variation des caractéristiques chimiques des lacs, ils sont de plus en plus recherchés dans les sédiments. Souvent incomplets, les mécanismes de leur précipitation dans la colonne d’eau du lac et dans les eaux interstitielles sont reprécisés dans cette étude. D’après la littérature, la sidérite et la rhodochrosite précipitent en milieu réducteur saturé de carbonate de fer et de carbonate de manganèse respectivement. Ces prévisions sont confirmées dans cet
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Momoshima, N., and E. A. Bondietti. "Cation binding in wood: applications to understanding historical changes in divalent cation availability to red spruce." Canadian Journal of Forest Research 20, no. 12 (1990): 1840–49. http://dx.doi.org/10.1139/x90-247.

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The ion exchange characteristics of red spruce (Picearubens Sarg.) bolewood were investigated to understand factors that control divalent cation and H+ concentrations in tracheid cell walls. Vertical concentration measurements of selected cations along the stem demonstrated that the alkaline earths showed the expected chromatographic fractionation, while other cations showed variable patterns relative to calcium. The concentration of cation binding sites (pectates) decreased in a predictable manner from the pith towards the cambium as a function of radius, not chronological age, explaining why
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Yoder, C. H., N. T. Landes, L. K. Tran, A. K. Smith, and J. D. Pasteris. "The relative stabilities of A- and B-type carbonate substitution in apatites synthesized in aqueous solution." Mineralogical Magazine 80, no. 6 (2016): 977–83. http://dx.doi.org/10.1180/minmag.2016.080.035.

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AbstractCarbonated calcium apatites doped with a monovalent cation (Li+, Na+, or K+) or a divalent cation (Mg2+ or Zn2+) were prepared in aqueous solution and analysed by powder X-ray diffraction, inductively coupled plasma atomic emission spectroscopy and infrared spectroscopy. The hypothesis that the location of carbonate in the apatite structure, either in place of hydroxide ions in the c-axis channels (A-type substitution) or in place of phosphate (B-type substitution), is affected by the solution energetics of the cation (specifically its enthalpy of hydration) was strengthened by the obs
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D’Elia, John A., and Larry A. Weinrauch. "Role of Divalent Cations in Infections in Host–Pathogen Interaction." International Journal of Molecular Sciences 25, no. 18 (2024): 9775. http://dx.doi.org/10.3390/ijms25189775.

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With increasing numbers of patients worldwide diagnosed with diabetes mellitus, renal disease, and iatrogenic immune deficiencies, an increased understanding of the role of electrolyte interactions in mitigating pathogen virulence is necessary. The levels of divalent cations affect host susceptibility and pathogen survival in persons with relative immune insufficiency. For instance, when host cellular levels of calcium are high compared to magnesium, this relationship contributes to insulin resistance and triples the risk of clinical tuberculosis. The movement of divalent cations within intrac
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Silverman, Harold, James W. McNeil, and Thomas H. Dietz. "Interaction of trace metals Zn, Cd, and Mn, with Ca concretions in the gills of freshwater unionid mussels." Canadian Journal of Zoology 65, no. 4 (1987): 828–32. http://dx.doi.org/10.1139/z87-131.

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The interaction of Zn, Mn, and Cd with Ca concretions in the gills of unionid mussels was investigated. Raising blood levels of these ions to twice their normal values for a week does not result in significant deposition of these metals into gill concretions. The interaction of Zn with the concretions was examined in more detail both in vivo and in vitro. Isolated concretions bind Zn as rapidly as Ca. However short-term in vivo labelling studies using radiolabeled Zn and Ca verify that Zn is not added to concretions while Ca is being rapidly accumulated. These studies demonstrate that calcium
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Bondietti, E. A., N. Momoshima, W. C. Shortle, and K. T. Smith. "A historical perspective on divalent cation trends in red spruce stemwood and the hypothetical relationship to acidic deposition." Canadian Journal of Forest Research 20, no. 12 (1990): 1850–58. http://dx.doi.org/10.1139/x90-248.

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Anomalies in the radial concentration trends of Ca2+, Mg2+, and other divalent cations in the stemwood of red spruce (Picearubens Sarg.) occurred in trees grown in New England, Tennessee, and North Carolina. These anomalies may be assumed to result from changes in sap chemistry. These inferred changes in sap chemistry were the expected result of changes of divalent cation availability in forest soils. The patterns of these anomalies may be interpreted as a signal of a regional mobilization of cations in the rooting zone of red spruce. The anomalous increase in divalent cations present in wood
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Rokitskaya, Tatyana I., Alexander M. Arutyunyan, Ljudmila S. Khailova, et al. "Usnic Acid-Mediated Exchange of Protons for Divalent Metal Cations across Lipid Membranes: Relevance to Mitochondrial Uncoupling." International Journal of Molecular Sciences 23, no. 24 (2022): 16203. http://dx.doi.org/10.3390/ijms232416203.

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Usnic acid (UA), a unique lichen metabolite, is a protonophoric uncoupler of oxidative phosphorylation, widely known as a weight-loss dietary supplement. In contrast to conventional proton-shuttling mitochondrial uncouplers, UA was found to carry protons across lipid membranes via the induction of an electrogenic proton exchange for calcium or magnesium cations. Here, we evaluated the ability of various divalent metal cations to stimulate a proton transport through both planar and vesicular bilayer lipid membranes by measuring the transmembrane electrical current and fluorescence-detected pH g
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Marshall, Wayne E., Lynda H. Wartelle, and Danny E. Akin. "Flax shive as a source of activated carbon for metals remediation." BioResources 2, no. 1 (2007): 82–90. http://dx.doi.org/10.15376/biores.2.1.82-90.

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Flax shive constitutes about 70% of the flax stem and has limited use. Because shive is a lignocellulosic by-product, it can potentially be pyrolyzed and activated to produce an activated carbon. The objective of this study was to create an activated carbon from flax shive by chemical activation in order to achieve significant binding of selected divalent cations (cadmium, calcium, copper, magnesium, nickel, zinc). Shive carbons activated by exposure to phosphoric acid and com-pressed air showed greater binding of cadmium, copper, nickel or zinc than a sulfuric acid-activated flax shive carbon
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Almatrafi, Roua, Saeed Banawas, and Mahfuzur R. Sarker. "Divalent Cation Signaling in Clostridium perfringens Spore Germination." Microorganisms 11, no. 3 (2023): 591. http://dx.doi.org/10.3390/microorganisms11030591.

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Spore germination plays an essential role in the pathogenesis of Clostridium perfringens-associated food poisoning. Germination is initiated when bacterial spores sense various stimuli, including chemicals and enzymes. A previous study showed that dipicolinic acid (DPA) chelated with calcium (Ca-DPA) significantly stimulated spore germination in C. perfringens. However, whether Ca2+ or DPA alone can induce germination is unknown. Therefore, we aimed to evaluate the possible roles of Ca2+ and other divalent cations present in the spore core, such as Mn2+ and Mg2+, in C. perfringens spore germin
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Dissertationen zum Thema "Calcium cations divalents"

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AbouKaïs-Nassrallah, Najat. "Influence du manganèse (II) et du cuivre (II) sur la transformation de la vatérite en calcite en solution aqueuse." Lille 1, 1997. http://www.theses.fr/1997LIL10165.

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Dans ce mémoire, nous nous sommes intéressés a la transformation cristalline de la vatérite en calcite cubique sous l'influence des cations métalliques divalents mn#2#+ et cu#2#+ dans l'eau ultra-pure. Pour cela, nous avons réalisé sur nos échantillons solides récupérés par filtration : I) des analyses macroscopiques en utilisant les techniques suivantes : spectroscopies atomique d'émission, vibrationnelles infrarouge et Raman, par diffraction des rayons x et de résonance paramagnétique électronique, mesures d'aire spécifique ; et II) des analyses microscopiques au moyen des methodes suivantes
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Lacapère, Jean-Jacques. "Mecanisme reactionnel de l'atpase calcium du reticulum sarcoplasmique : interaction avec les nucleotides, role des cations divalents." Paris 6, 1987. http://www.theses.fr/1987PA066465.

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L'atpase calcique du reticulum sarcoplasmique hydrolyse une molecule d'atp pour transporter du calcium contre son gradient de concentration. Plusieurs hypotheses existantes pour expliquer ce phenomene: 1) deux sites topologiquement differents (un site catalytique de haute affinite et un site activateur de basse affinite) 2) un seul site ayant des affinites differentes pour les deux conformations principales de l'enzyme, la saturation sur site basse affinite entrainant une acceleration du changement de conformation 3) un seul site, la liaison d'atp sur le site catalytique phosphoryle de l'enzym
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Lacapere, Jean-Jacques. "Mécanisme réactionnel de l'ATPase calcium du reticulum sarcoplasmique interaction avec les nucléotides, rôle des cations divalents /." Grenoble 2 : ANRT, 1987. http://catalogue.bnf.fr/ark:/12148/cb37606772m.

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Amat, Tiffany. "Interplay between pulse proteins, phytic acid and calcium : impact on their aggregation state and solubility." Electronic Thesis or Diss., Bourgogne Franche-Comté, 2024. http://www.theses.fr/2024UBFCK048.

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Ce projet de thèse vise à approfondir les connaissances sur les interactions qui peuvent exister entre les protéines de féveroles et de pois, les ions calcium et l’acide phytique (AP). Différents niveaux de complexité ont été étudiés depuis les concentrés et isolats commerciaux jusqu’aux fractions protéiques extraites en laboratoire (globulines totales, vicilines 7S, légumines 11S et albumines 2S). Les impacts de la dénaturation protéique par chauffage ont aussi été analysés. Les résultats ont mis en évidence que les interactions moléculaires sont influencées par le pH et les concentrations mo
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Jesus, Florence de. "Caractérisation des propriétés de la partie membranaire de l'ATPase-Ca2+ du réticulum sarcoplasmique du muscle squelettique de lapin : étude de la perméabilité passive aux cations monovalents et divalents." Université Joseph Fourier (Grenoble ; 1971-2015), 1995. http://www.theses.fr/1995GRE10229.

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L' atpase-ca#2#+ serca-1a initie la relaxation musculaire en pompant activement le calcium cytoplasmique à l'intérieur du reticulum sarcoplasmique. Le domaine transmembranaire de cette protéine a été caractérisé en étudiant les phénomènes de perméabilité passive. L'utilisation de la thapsigargine, un inhibiteur spécifique de la protéine a montré que l'enzyme est permeante aux cations monovalents (k#+ ou na#+), en absence de calcium externe (ca#1#/#2n0,2-0,15 um) et de protons (pk=7,4 a 0c). Cette permeation est inhibée par la thapsigargine et le vanadate qui stabilisent la protéine dans sa con
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Forristal, Ailish. "MRS studies on the role and function of divalent cations in the cerebral cortex." Thesis, University of Nottingham, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.299709.

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Wang, Yu-Wen. "Substitution of Catalytic Calcium to Divalent Metal Cations in Paraoxonase 1 (PON1): Implications for the Catalytic Mechanism." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1525760969900355.

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JOUSSE, FABIEN. "Adsorption de l'oxygene dans des zeolithes a a cations monovalents et divalents spectrometrie infrarouge, calcul de l'interaction et deplacement de la frequence vibrationnelle." Paris 6, 1994. http://www.theses.fr/1994PA066605.

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Ce travail presente d'une part l'analyse infrarouge de la bande induite de l'oxygene adsorbe dans differentes zeolithes (naa, nacaa, caa), et d'autre part un calcul du deplacement des niveaux vibrationnels de la molecule perturbee par l'interaction avec les ions du cristal. Cette etude montre que le deplacement de frequence n'est pas relie de facon simple a la configuration d'equilibre de la molecule dans son site d'adsorption. La precision des resultats est limitee par l'absence de donnees sur les derivees secondes par rapport a la coordonnee interne de la polarisabilite et du quadrupole. La
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"Exploring calcium channels using divalent cations and specific channel blockers in frog sympathetic neurons." Tulane University, 2001.

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In the present study, distinctive interactions of divalent cations and specific blockers with calcium channels were exploited to probe several functional features related to permeation through calcium channels in frog sympathetic neurons In the first study, our experiments have focused on resolving a paradox why the whole-cell current has not been observed under typical recording conditions for one type of calcium channel that is highly expressed in frog sympathetic neurons. These channels are referred to as Ef-channels, and they are present in the membrane at a density greater than the channe
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Bücher zum Thema "Calcium cations divalents"

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Houillier, Pascal. Magnesium homeostasis. Edited by Robert Unwin. Oxford University Press, 2015. http://dx.doi.org/10.1093/med/9780199592548.003.0027.

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Magnesium is critically important in the process of energy release. Although most magnesium is stored outside the extracellular fluid compartment, the regulated concentration appears in blood. Urinary magnesium excretion can decrease rapidly to low values when magnesium entry rate into the extracellular fluid volume is low, which has several important implications: cell and bone magnesium do not play a major role in the defence of blood magnesium concentration; while a major role is played by the kidney and especially the renal tubule, which adapts to match the urinary magnesium excretion and
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Buchteile zum Thema "Calcium cations divalents"

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Nara, Masayuki, Hisayuki Morii, and Masaru Tanokura. "Coordination to Divalent Cations by Calcium-Binding Proteins." In Methods in Molecular Biology. Springer New York, 2019. http://dx.doi.org/10.1007/978-1-4939-9030-6_9.

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Westbrook, Gary L., and Mark L. Mayer. "Divalent Cations as Modulators of NMDA-Receptor Channels on Mouse Central Neurons." In Calcium and Ion Channel Modulation. Springer US, 1988. http://dx.doi.org/10.1007/978-1-4613-0975-8_32.

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Stern, Paula H. "Interactions of Calcemic Hormones and Divalent Cation Ionophores on Fetal Rat Bone in Vitro." In Calcium in Biological Systems. Springer US, 1985. http://dx.doi.org/10.1007/978-1-4613-2377-8_58.

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Cox, Jos A. "Divers Models of Divalent Cation Interaction to Calcium-Binding Proteins: Techniques and Anthology." In Methods in Molecular Biology. Humana Press, 2012. http://dx.doi.org/10.1007/978-1-62703-230-8_2.

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Colwell, Frederick S., Robert W. Smith, F. Grant Ferris, et al. "Microbially Mediated Subsurface Calcite Precipitation for Removal of Hazardous Divalent Cations: Microbial Activity, Molecular Biology, and Modeling." In ACS Symposium Series. American Chemical Society, 2005. http://dx.doi.org/10.1021/bk-2005-0904.ch006.

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Yatime, Laure. "Structural Analysis of S100A8 Complex with Zinc and Calcium: A General Protocol for the Study of S100 Proteins in the Presence of Divalent Cations by X-Ray Crystallography." In Methods in Molecular Biology. Springer New York, 2019. http://dx.doi.org/10.1007/978-1-4939-9030-6_26.

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Singh, Anu, Ritesh Verma, Preeti Thakur, Atul Thakur, and Fayu Wan. "Structural Analysis of Piezoelectric Perovskite Materials." In Biomedical Applications of Perovskites: The Era of Bio-Piezoelectric Systems. BENTHAM SCIENCE PUBLISHERS, 2024. http://dx.doi.org/10.2174/9789815256383124010005.

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Perovskite (Calcium titanium oxide)was discovered in 1839 by Alekseevich Perovski, a Russian mineralogist. Perovskites are materials with the same structure as calcium titanium oxide (CaTiO3 ) mineral or you can say that all the materials with the same structure as CaTiO3 are perovskites. The basic structure of perovskite is ABX3 , where the A-site is generally occupied by large twelve coordinated cations and B by smaller, octahedrally coordinated cations, and X is a common anion, for instance, Oxygen. A cation is divalent and B is tetravalent cation. Tilting of BO6 octahedra through B-O-B linkage results in rhombohedral, orthorhombic and tetragonal structures. The structure of perovskites can be modified by doping and altering synthesis techniques, such as by changing pH value, calcination temperature, and calefactive velocity. Perovskite materials have a wide range of applications in different fields, such as solar cells, photodetectors, sensors, water purification, etc
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Sheterline, Peter, Jon Clayton, and John C. Sparrow. "Ligand-binding sites." In Actin. Oxford University PressOxford, 1999. http://dx.doi.org/10.1093/oso/9780198504634.003.0003.

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Abstract There is a single, exchangeable high-affinity divalent-cation-binding ,site located ,,within the cleft of actin close to the nucleotide and three or more intermediate and lower affinity cation binding sites elsewhere on the molecule (see Table 2 and [34] for review). The high-affinity cation-binding site has relative affinities for cation in the order Ca> Mn >Cd> :Mg > Zn > Ni > Sr [425,426, 427, 399, 1277], whilst the lower affinity sites do not greatly discriminare between calcium and magnesium and will bind monovalent cations [377].
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"Aa." In Biochemistry and Molecular biology, edited by Dr AD Smith, SP Datta, Dr G. H. Smith, et al. Oxford University PressOxford, 1997. http://dx.doi.org/10.1093/oso/9780198547686.003.0001.

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Abstract A23187 or calcimycin a toxic and weakly antibiotic substanceisolated from cultures of Streptomyces chartreusensis. It is alipophilic 523 Da monocarboxylic acid of complex structure,two molecules of which form stable lipid-soluble complexes atpH 7.4 with one atom of certain divalent metal cations, especiallyMn2+ , Ca2+ , and Mg2+ ; monovalent cations are boundonly weakly. It also forms lipid-soluble complexes with certainamino acids. It is used experimentally as a calcium ionophore.
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Susanna Tojkander, Sari. "TRPV Family Ion Channels in the Mammary Epithelium: Role in Normal Tissue Homeostasis and along Breast Cancer Progression." In Ion Channels - From Basic Properties to Medical Treatment [Working Title]. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.103665.

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Calcium homeostasis directs various intracellular cascades and therefore strict spatio-temporal control of calcium influx is also crucial for diverse physiological processes. In the mammary gland, calcium is important for the specialized tasks of this organ during lactation, but it also guides other structural and functional features of the mammary epithelium and in this way the maintenance of the whole tissue. Transient receptor potential, TRP, family ion channels are cationic channels, permeable to both monovalent and divalent cations and play a role in the influx of calcium mainly through the plasma membrane. These channels also represent vital calcium entry routes in the mammary epithelium and may thus act as central players in the preservation of calcium balance within this tissue. Moreover, TRP family channel proteins are abnormally expressed in breast cancers and may promote cancer progression through deregulation of intracellular signaling, consequently triggering several hallmarks of cancer. This chapter concentrates on the role of transient receptor potential vanilloid, TRPV, a subfamily of proteins in the calcium-dependent functions of normal mammary epithelium and the evident role of these channel-forming proteins along breast cancer progression.
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Konferenzberichte zum Thema "Calcium cations divalents"

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Rousseau, David, and Mathieu Salaün. "Impact Of Cation Exchange On Polymer In-Situ Viscosity: An Experimental Investigation For A Low-Salinity Polymer Flooding Case." In International Petroleum Technology Conference. IPTC, 2023. http://dx.doi.org/10.2523/iptc-22907-ms.

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Abstract Cation exchange occurs when water with a different salinity as the connate brine is injected in a reservoir. During polymer flooding operations, the potential release of divalent cations by the rock can have a detrimental impact on the in-situ viscosity in the polymer bank. The objective of this work was to assess for the risk related to cations exchange in an Argentinian oilfield and to provide guidelines for the injection water design. Reservoir rock samples were first submitted to mineralogical analysis involving scanning-electron microscopy (SEM), X-Ray Diffraction (XRD) and deter
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Fisher, Nicholas, Marc Lehmann, Steve Brunt, and Mark Gloyn. "Selection of a Flocculant to Assist in Divalent Cation Removal in a MEG Pre-Treatment Process." In Offshore Technology Conference Asia. OTC, 2022. http://dx.doi.org/10.4043/31690-ms.

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Abstract When monoethylene glycol (MEG) is used to provide hydrate protection for gas condensate production, MEG pre-treatment, reconcentration and reclamation systems are generally employed to recover and reuse the MEG. Prior to reconcentration, low solubility salts of divalent cations such as calcium, iron, strontium and magnesium, that may be present in the Rich MEG, are removed in a MEG pre-treatment process. This process involves the addition of a base, such as NaOH or KOH, to the Rich MEG at elevated temperatures to convert dissolved carbon dioxide to carbonate ions and so precipitate th
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Andersen, Pål Østebø, Sander Sunde Herlofsen, Reidar Inge Korsnes, and Mona Wetrhus Minde. "Flow-Through Experiments of Reactive Ba-Sr-Mg Brines in Mons Chalk at North Sea Reservoir Temperature at Different Injection Rates." In SPE EuropEC - Europe Energy Conference featured at the 84th EAGE Annual Conference & Exhibition. SPE, 2023. http://dx.doi.org/10.2118/214367-ms.

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Abstract Chalk reservoirs in the North Sea of Norway contain significant amounts remaining oil and gas, and are potential candidates for enhanced recovery by modifying the injected brine composition. This work investigates how brines with divalent cations Ba, Sr and Mg interact when injected into chalk (CaCO3). Ba and Sr are often associated with mineral precipitation and occur in formation water while Mg is present in seawater, commonly injected in chalk. Relatively clean (>99% calcite) outcrop chalk cores from Mons, Belgium, were flooded at 130 °C in triaxial cells with four brines co
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Al Murayri, Mohammed T., Dawood S. Sulaiman, Anfal Al-Kharji, et al. "Scale Mitigation for Field Implementation of Alkaline-Surfactant-Polymer ASP Flooding in a Heterogeneous High Temperature Carbonate Reservoir with High Divalent Cation Concentration in Formation Water." In Abu Dhabi International Petroleum Exhibition & Conference. SPE, 2021. http://dx.doi.org/10.2118/207573-ms.

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Abstract An alkaline-surfactant-polymer (ASP) pilot in a regular five spot well pattern is underway in the Sabriyah Mauddud (SAMA) reservoir in Kuwait. High divalent cation concentrations in formation water and high carbonate concentration of the ASP formulation makes the formation of calcite scale a concern. The main objective of this study is to investigate the severity of the calcium carbonate (CaCO3) scaling issues in the central producer in pursuit of a risk mitigation strategy to treat the potential scale deposition and reduce the flow assurance challenges. Calcite scaling risk in terms
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Hassan, Anas M., Emad W. Al-Shalabi, Aaron G. Tellez Arellano, Muhammad S. Kamal, Shirish Patil, and Syed M. Shakil Hussain. "Mechanistic Modeling for Low Salinity Polymer (LSP) Flooding in Carbonates Under Harsh Conditions." In SPE Annual Technical Conference and Exhibition. SPE, 2023. http://dx.doi.org/10.2118/215059-ms.

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Abstract Low Salinity Polymer (LSP) injection is a hybrid synergistic Enhanced Oil Recovery (EOR) technique that improves displacement efficiency by combining the advantages of both low salinity and polymer flooding methods. Nevertheless, proper design of this technique at field-scale requires a predictive mechanistic model that captures the geochemical interactions that occur within the polymer-brine-rock (PBR) system. A few studies have so far attempted to mechanically model the LSP injection process. Therefore, to achieve a realistic mechanistic model in this contribution, we used the valid
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Brenas, T., A. L. Vincent, and N. Lesage. "Mineral Sulfite Scale Issues: Water Compatibility and Mitigation Assessment." In Offshore Technology Conference. OTC, 2024. http://dx.doi.org/10.4043/35497-ms.

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Abstract This paper aims to study the compatibility of two mineral waters (containing sulfites and calcium) likely to produce large quantity of sulfites scale if they are mixed. This scale formation impacts the production facilities and is hardly recoverable. Consequently, this work is assessing the scale risks simulation and simple laboratory tests. The results of both methods show very high risks of precipitation likely to disturb process operations. The scale quantity is also very sensitive to pH modification. Then, three different scale mitigations solutions were evaluated to prevent any d
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Abu-Al-Saud, Moataz, Subhash Ayirala, Abdulkareem AlSofi, and Ali Yousef. "A Surface Complexation Modeling SCM Based Electrokinetic Solution for Chemical EOR in Carbonates." In SPE Conference at Oman Petroleum & Energy Show. SPE, 2022. http://dx.doi.org/10.2118/200027-ms.

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Abstract Understanding the impact of water salinity and ionic compositions on rock-fluids interactions and subsequently wettability plays a major role to determine the performance of different recovery processes in carbonate formations. Various studies have shown that surface electric charge manipulation is the main driving mechanism behind wettability alteration observed in controlled ionic composition waterflooding (CICW) processes. Therefore, investigation of electrokinetic interactions at both brine/calcite and brine/crude-oil interfaces is important to optimize the injection water composi
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Sugai, Yuichi, Nao Miyazaki, Satohiro Yanagisawa, and Yoshifumi Okamoto. "Study on the application of surfactin for enhanced oil recovery." In 2022 AOCS Annual Meeting & Expo. American Oil Chemists' Society (AOCS), 2022. http://dx.doi.org/10.21748/qugo4464.

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Surfactin is an anionic bio-surfactant produced by Bacillus subtilis. Although it has high capacity to decrease interfacial tension between oil and water and improve oil recovery, it has not been used for enhanced oil recovery because it forms precipitation by binding with divalent cations such as calcium ions which are contained in formation water. This study examined the countermeasure to prevent surfactin from forming the precipitation for applying it to enhanced oil recovery. Alcohols, chelating agents, a cationic surfactant and an ion capturing substance were selected as the candidates fo
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Zhou, Nancy C., Fangya Niu, Krishna K. Panthi, et al. "Feasibility Study of Low-Tension-Gas Flooding Application in High Temperature High Salinity Sandstone Reservoirs." In ADIPEC. SPE, 2023. http://dx.doi.org/10.2118/216524-ms.

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Abstract Low-tension-gas (LTG) flooding has been demonstrated in the laboratory to improve oil recovery for tight formations with sub-20-md permeability. High temperature and high salinity (HTHS) reservoir conditions still pose significant challenges for this hybrid surfactant and gas enhance oil recovery (EOR) method. This paper presents a systematic study that includes developing low interfacial tension (IFT) surfactant formulation, investigating LTG flooding, and lab-scale reservoir simulations to evaluate the feasibility of LTG for field application in harsh reservoir conditions. The brine
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Wang, C. T., W. J. Tsai, J. C. Chen, Y. J. Shiao, and J. Y. Lee. "BLEB FORMATION ON THE HUMAN PLATELET MEMBRANE SURFACE IS INDUCED BY SURFACE BOUND CALCIUM ION." In XIth International Congress on Thrombosis and Haemostasis. Schattauer GmbH, 1987. http://dx.doi.org/10.1055/s-0038-1643533.

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the morphological sthudy by scanning electron microscopy (SEM) showed that blebs were found on cell surface of the gel-filtered human platelets when incubated in the modified Tyrode's buffer containing 8mM or higher of Ca++ for 5 min. EDTA immediately abolished blebs [Wang et al Thrombos. Haemostas., 54, 184 (1985)]. The phenomenon was further investigated. The bleb-forming cells respond ghto thrombin stimulation with as aggregation rate 30% lower than that of control. EDTA reversed the aggregation rate back to that of control. Two other divalent cations, i.e. Ba++ andSr++ at a concentration a
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