Relevant bibliographies by topics / Calcium ions

Academic literature on the topic 'Calcium ions'

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Published: 4 June 2021
Last updated: 9 March 2023

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Journal articles on the topic "Calcium ions"

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McDonough, Paul G., and Chuang-Ye Hong. "Calcium Ions and Sperm." Fertility and Sterility 56, no. 1 (July 1991): 153. http://dx.doi.org/10.1016/s0015-0282(16)54440-9.

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Cheng, Gege, Wenwen Li, Long Li, Fuhou Lei, Xiuyu Liu, and Qin Huang. "Removing Calcium Ions from Remelt Syrup with Rosin-Based Macroporous Cationic Resin." Polymers 14, no. 12 (June 14, 2022): 2397. http://dx.doi.org/10.3390/polym14122397.

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Mineral ions (mainly calcium ions) from sugarcane juice can be trapped inside the heating tubes of evaporators and vacuum boiling pans, and calcium ions are precipitated. Consequently, sugar productivity and yield are negatively affected. Calcium ions can be removed from sugarcane juice using adsorption. This paper described the experimental condition for the batch adsorption performance of rosin-based macroporous cationic resins (RMCRs) for calcium ions. The kinetics of adsorption was defined by the pseudo-first-order model, and the isotherms of calcium ions followed the Freundlich isotherm model. The maximal monolayer adsorption capacity of calcium ions was 37.05 mg·g−1 at a resin dosage of 4 g·L−1, pH of 7.0, temperature of 75 °C, and contact time of 10 h. It appeared that the adsorption was spontaneous and endothermic based on the thermodynamic parameters. The removal rate of calcium ions in remelt syrup by RMCRs was 90.71%. Calcium ions were effectively removed from loaded RMCRs by 0.1 mol·L−1 of HCl, and the RMCRs could be recycled. The dynamic saturated adsorption capacity of RMCRs for calcium ions in remelt syrup was 37.90 mg·g−1. These results suggest that RMCRs are inexpensive and efficient adsorbents and have potential applications for removing calcium ions in remelt syrup.
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Tsukui, Kei, Takuya Kakiuchi, Hidetomo Sakurai, and Yoshihiro Tokudome. "Shotokuseki Extract Promotes Keratinocyte Differentiation Even at a Low Calcium Concentration." Applied Sciences 12, no. 5 (February 22, 2022): 2270. http://dx.doi.org/10.3390/app12052270.

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The switch between keratinocyte proliferation and differentiation is regulated by extracellular calcium levels, requiring high concentrations (>1 mol/L) of extracellular calcium to induce differentiation. The Shotokuseki extract (SE) contains various ions such as calcium, but its effect on keratinocytes is unknown. This study focused on calcium-induced differentiation of keratinocytes and investigated the effects of simultaneous application of calcium and other ions on keratinocyte differentiation. The expression of differentiation markers increased when SE was added to a keratinocyte culture but not when only calcium was added at the same concentration present in SE. The calcium concentration in SE was found to be too low (0.01 mol/L) to induce differentiation of keratinocytes. In addition, the application of SE increased intracellular calcium concentration compared with calcium solution alone. Therefore, the induction of keratinocyte differentiation by SE is not calcium-dependent, or SE may alter the calcium sensitivity of keratinocytes. In our study, we found that simultaneous application of multiple ions and/or the application of trace ions may alter calcium sensitivity and the epidermal cell response. The function of ion transporters associated with these ions and the response of cells to ions depends largely on the balance among various ions and the function of trace ions.
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Meng, Yue Cheng, Lun Bo Hong, and Jian Qiu Jin. "A Study on the Gelation Properties and Rheological Behavior of Gellan Gum." Applied Mechanics and Materials 284-287 (January 2013): 20–24. http://dx.doi.org/10.4028/www.scientific.net/amm.284-287.20.

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The effects of gellan gum and calcium ions concentration on gelation characteristics and rheological behavior were investigated using TA(texture analysis)and mechanical rheometer which monitored respectively press strength and the evolution of G′. At a premium gellan gum content of 0.02g in 100ml buffer solution, increasing calcium ions concentration led to an increase in the gelation strength, but when calcium ions content reached a critical concentration values range from 0.015% to 0.02%, gelation strength begin to decrease. While in the same content of calcium ions, calcium lactate exhibits grater effects on gelation strength than calcium chloride. The temperature at the onset of gelation and the gelation rates showed an increase with the increasing of gellen and calcium ions content. At the same calcium ions concentration, the evolution of modulus storage (G′), gel temperature and rate are higher with the addition of calcium lactate than using calcium chloride. Our study indicated exponential relationship between gelling temperature (gelling rate) and calcium concentration.
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GORDIENKO, Katerina, Yaroslav RADOVENCHYK, Tamara KRYSENKO, and Vyacheslav RADOVENCHYK. "EFFICIENCY OF PLANTING CALCIUM IONS FROM DILUTE AQUEOUS SOLUTIONS IN THE FORM OF PHOSPHATES." Herald of Khmelnytskyi National University. Technical sciences 313, no. 5 (October 27, 2022): 134–40. http://dx.doi.org/10.31891/2307-5732-2022-313-5-134-140.

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The specifics of calcium phosphate formation process during diluted aqueous solutions softening for home or office were researched. Studies have shown that, unlike calcium carbonate, effective precipitation of calcium ions with phosphate is possible even at doses less than stoichiometric. The ratio between concentrations of phosphate ions and calcium ions K = [PO43-, mg-eq] / [Ca2+, mg-eq] is a determining factor. Already at K = 0.5 there is a decrease in the content of calcium ions by more than half. In stoichiometry (K = 1), the residual concentrations of calcium ions in the treated water fall below 1 mg-eq/dm3. At K > 1.5, the content of calcium ions in the treated water stabilizes at the level of 0.2 – 0.1 mg-eq/dm3. Water temperature does not significantly affect the deposition of calcium ions with phosphates. A noticeable decrease in efficiency is recorded only at a temperature of 5 ° C. But even in this case, this decrease is 0.1 – 1.5 mg-eq/dm3, which is quite acceptable for living conditions, since it provides soft and very soft water. The reaction between calcium ions and phosphates is quite complete in the first minutes of contact. The settling of mixed solutions for an hour showed that the reaction of the formation of a solid phase takes place at the time of draining the solutions and over time the residual hardness of the water practically does not change. From the point of view of softening efficiency, phosphate is quite suitable as a reagent for removing calcium ions from hard natural waters. An important aspect of the softening technology is the separation of the precipitate formed from the treated water. To do this, it is necessary to determine the conditions for the formation of a crystalline, most compact and formed precipitate. The clarification of the hard water sample treated with sodium phosphate showed that there was no significant difference in deposition at different initial pH values.
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Deftereos, Spyridon, Nikolaos Papoutsidakis, Georgios Giannopoulos, Christos Angelidis, Konstantinos Raisakis, Georgios Bouras, Periklis Davlouros, et al. "Calcium Ions in Inherited Cardiomyopathies." Medicinal Chemistry 11, no. 999 (September 28, 2015): 1. http://dx.doi.org/10.2174/1573406411666150928113018.

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Deftereos, Spyridon, Nikolaos Papoutsidakis, Georgios Giannopoulos, Christos Angelidis, Konstantinos Raisakis, Georgios Bouras, Periklis Davlouros, et al. "Calcium Ions in Inherited Cardiomyopathies." Medicinal Chemistry 12, no. 2 (February 8, 2016): 139–50. http://dx.doi.org/10.2174/157340641202160209093713.

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Kostiuk, PH. "Calcium ions in cell nucleus." Fiziolohichnyĭ zhurnal 56, no. 4 (July 15, 2010): 10–13. http://dx.doi.org/10.15407/fz56.04.010.

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Brown, Edward M., Peter M. Vassilev, and Steven C. Hebert. "Calcium ions as extracellular messengers." Cell 83, no. 5 (December 1995): 679–82. http://dx.doi.org/10.1016/0092-8674(95)90180-9.

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Nakai, Junichi, and Masamichi Ohkura. "Probing Calcium Ions with Biosensors." Biotechnology and Genetic Engineering Reviews 20, no. 1 (December 2003): 3–22. http://dx.doi.org/10.1080/02648725.2003.10648035.

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Dissertations / Theses on the topic "Calcium ions"

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Pickles, Raymond J. "Intracellular calcium ions in epithelial ion transport." Thesis, University of Cambridge, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.307103.

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Poitras, Marc. "Mécanisme de régulation du Ca(2+) intracellulaire dans le cortex surrénalien bovin." Sherbrooke : Université de Sherbrooke, 1998.

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Lisowski, Caroline. "Ions calcium uniques pour un étalon de fréquence optique." Phd thesis, Université de Provence - Aix-Marseille I, 2005. http://tel.archives-ouvertes.fr/tel-00009617.

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Cette thèse s'inscrit dans un projet visant à réaliser un étalon de fréquence optique à ion calcium unique confiné dans un piège de Paul-Straubel. La première partie du manuscrit est consacrée au piégeage et au refroidissement laser des ions. Les trois sources lasers (397 nm, 866 nm et 729 nm) utilisées dans l'expérience sont étudiées en détail. Pour atteindre le régime de Lamb-Dicke et ainsi éliminer l'élargissement par effet Doppler du premier ordre, il est indispensable de réduire le mouvement de l'ion. Différentes techniques de réduction du micromouvement sont exposées, en particulier une nouvelle méthode basée sur l'observation de résonances noires a été mise en place. Des simulations numériques utilisant la matrice densité permettent d'expliquer les observations expérimentales. Une deuxième partie décrit les expériences réalisées pour déterminer les durées de vie des niveaux D3/2 et D5/2 de l'ion calcium 40. La mesure de la durée de vie du niveau D5/2 est une étape importante puisqu'elle permet de contrôler et de réduire les effets qui pourraient élargir la transition d'horloge. La dernière partie de ce mémoire est dédiée à l'évaluation théorique des effets systématiques pouvant affecter la fréquence du futur étalon. Un étalon de fréquence optique basé sur la transition S1/2,F=4,m_F=0 ---> D5/2,F=6,m_F=0 de l'ion 43Ca+ pourra atteindre une exactitude de 4*10^(-16).
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Scheppach, Christian Othmar. "Properties of single calcium-permeable ion channels in neocortical neurons." Thesis, University of Cambridge, 2015. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.708942.

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Fénelon, Karine. "Le recrutement des canaux de libération du calcium (Ca2+), par la libération du Ca2+ induite par le Ca2+ (LCIC), évalué par l'introduction de 8 mM bapta dans le myoplasme de la fibre musculaire coupée de la grenouille." Sherbrooke : Université de Sherbrooke, 2002.

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Winegar, Bruce D. (Bruce David). "Roles of Calcium Ions and Cyclic AMP in Olfactory Transduction." Thesis, North Texas State University, 1986. https://digital.library.unt.edu/ark:/67531/metadc331287/.

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The roles of Ca2 + and cAMP in olfactory transduction were explored using agents which affect calcium channels and second messenger systems. These agents were applied at certain calculated final concentrations onto olfactory epithelia of urethane-anesthetized frogs (Sana PiPlens) by two-sec aerosol spray. During extracellular recording, saturated vapors of isoamyl acetate were delivered every 100 sec in 0.3 sec pulses to produce an electroolfactogram (EOG). Inorganic cations that block inward calcium currents inhibit EOG responses with the following rank order: (La3+) > (Zn2+, Cd2+) > (Al3+, Ca2+, Sr2+) > (Co2+). Application of 7.5 mM La3+ eradicates £0G's, while Ba2+ (which can carry more current that Ca2+) initially produces significant enhancement (F=43.04, p<0.001, df=19). Magnesium ion has no effect on EOG's at 7.5 mM, while 1.5 X 10"4M Ca2+ is significantly inhibitory (F=5.74; p=0.0355; df=12). Control aerosol sprays of distilled water depress EOG's by an average of 5%. The organic calcium channel antagonists diltiazem and verapamil inhibit EOG's by 17% and 36X, respectively, at a concentration of 1.5 X 10~*M. Verapamil produces significant inhibition (F=17.17; p=0.002; df=ll) at 1.5 X 10" 5 M, while the 1,4-dihydropyridine calcium channel antagonists, nicardipine and nifedipine, do not inhibit beyond 1% DMSO controls. Several calmodulin antagonists decrease EOG's, but without correlation to their anti-calmodulin potency. Application of 1.5 X 10"*M chlorpromazine and N-(6-aminohexyl)-5-chloro-l-naphthalenesulfonamide inhibit EOG's by 31% and 27%, respectively, while trifluoperazine inhibits by 23%. Dibutyryl cAMP, a lipophilic mimic of cAMP, produces 54% inhibition at 1.5 X 10" *M. Dibutyryl cGMP, cGMP, cAMP, and adenosine all decrease EOG's by less than 15% compared to distilled water controls. Forskolin, a reversible activator of adenylate cyclase, inhibits EOG's by 57% at 1.5 X 10"5M, which is significant beyond the 1% DMSO controls (F=17.17; p=0.002; df=ll). These data support the hypothesis that Ca2+ participates in olfactory transduction. Calcium ions could serve as charge carriers, second messengers, or both. Cyclic AMP could be involved with the primary excitatory process or sensory adaptation, or both.
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Wang, Yu-Wen. "Substitution of Calcium with Divalent Metal Ions in Paraoxonase I." The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1420819949.

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Sami, Massaad Danie. "Régulation du calcium cytosolique et nucléaire par l'endothéline-1 dans les cellules cardiaques." Sherbrooke : Université de Sherbrooke, 1999.

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Hauser, Melanie R. "Selective calcium binding by alpha-hydoxyketones and alpha-hydroxyamides /." view abstract or download file of text, 2006. http://proquest.umi.com/pqdweb?did=1251854561&sid=3&Fmt=2&clientId=11238&RQT=309&VName=PQD.

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Thesis (Ph. D.)--University of Oregon, 2006.
Typescript. Includes vita and abstract. Includes bibliographical references (leaves 115 - 121). Also available for download via the World Wide Web; free to University of Oregon users.
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Dipp, Michelle. "The role of calcium sensitisation in hypoxic pulmonary vasoconstriction." Thesis, University of Oxford, 2001. http://ora.ox.ac.uk/objects/uuid:d14ca3ef-c5b8-4a4c-b9d4-5a1ee086cb4a.

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Books on the topic "Calcium ions"

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Calcium ions in nerve cell function. Oxford: Oxford University Press, 1992.

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Timet, Dubravko. Influence of sodium ions on the intensity of calcium absorption in the bovine stomach in the presence of magnesium ions =: Utjecaj natrijevih iona na intenzitet resorpcije kalcija u želucu goveda u prisutnosti magnezijevih iona. Zagreb: Jugoslavenska akademija znanosti i umjetnosti, 1987.

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Gregory, Bock, Ackrill Kate, and Symposium on Calcium Waves, Gradients and Oscillations (1994 : Ciba Foundation), eds. Calcium waves, gradients and oscillations. Chichester, West Sussex, England: Wiley, 1995.

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Kazuhiro, Kohama, ed. Calcium inhibition: A new mode for CA²⁺ regulation. Tokyo: Japan Scientific Societies Press, 1992.

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Vlii͡a︡nie ionov i temperatury na generat͡s︡ii͡u︡ ritma serdt͡s︡a pozvonochnykh: Ėlektrofiziologicheskie issledovanii͡a︡. Leningrad: "Nauka," Leningradskoe otd-nie, 1989.

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Parker, Philip M., and James N. Parker. Ionized calcium: A medical dictionary, bibliography, and annotated research guide to Internet references. San Diego, CA: ICON Health Publications, 2004.

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United States. National Aeronautics and Space Administration., ed. Ca-rich carbonate melts: A regular-solution model, with applications to carbonatite magma + vapor equilibria and carbonate lavas on Venus. [Washington, DC: National Aeronautics and Space Administration, 1995.

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United States. National Aeronautics and Space Administration., ed. Ca-rich carbonate melts: A regular-solution model, with applications to carbonatite magma + vapor equilibria and carbonate lavas on Venus. [Washington, DC: National Aeronautics and Space Administration, 1995.

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United States. National Aeronautics and Space Administration., ed. Ca-rich carbonate melts: A regular-solution model, with applications to carbonatite magma + vapor equilibria and carbonate lavas on Venus. [Washington, DC: National Aeronautics and Space Administration, 1995.

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Toshio, Narahashi, ed. Ion channels. New York: Plenum Press, 1988.

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Book chapters on the topic "Calcium ions"

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McCormack, James G., and Richard M. Denton. "Calcium Ions, Hormones, and Mammalian Oxidative Metabolism." In Cell Calcium Metabolism, 325–30. Boston, MA: Springer US, 1989. http://dx.doi.org/10.1007/978-1-4684-5598-4_35.

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Tian, Li, Xiaonan Deng, Susan Kleinfelter, Michael Kirberger, and Jenny Yang. "Sensing Calcium Dynamics and Calcium Signaling." In Molecular Bio-Sensors and the Role of Metal Ions, 51–84. Boca Raton: CRC Press, 2022. http://dx.doi.org/10.1201/9781003229971-3.

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Opie, L. H., W. A. Coetzee, and W. T. Clusin. "Calcium Ions and Ventricular Arrhythmias." In Myocardial Response to Acute Injury, 48–66. London: Macmillan Education UK, 1992. http://dx.doi.org/10.1007/978-1-349-12522-7_4.

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Stojilkovic, Stanko S., Melanija Tomić, Taka-aki Koshimizu, and Fredrick Van Goor. "Calcium Ions as Intracellular Messengers." In Principles of Molecular Regulation, 149–85. Totowa, NJ: Humana Press, 2000. http://dx.doi.org/10.1007/978-1-59259-032-2_9.

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Brini, Marisa, Tito Calì, Denis Ottolini, and Ernesto Carafoli. "Intracellular Calcium Homeostasis and Signaling." In Metal Ions in Life Sciences, 119–68. Dordrecht: Springer Netherlands, 2012. http://dx.doi.org/10.1007/978-94-007-5561-1_5.

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Brini, Marisa, Denis Ottolini, Tito Calì, and Ernesto Carafoli. "Calcium in Health and Disease." In Metal Ions in Life Sciences, 81–137. Dordrecht: Springer Netherlands, 2013. http://dx.doi.org/10.1007/978-94-007-7500-8_4.

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Lauritzen, M., M. Sheardown, and A. J. Hansen. "Aspects of Calcium Ions in Cortical Spreading Depression." In Cerebral Ischemia and Calcium, 449–57. Berlin, Heidelberg: Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/978-3-642-85863-5_58.

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Lucy, Jack A. "Calcium Ions, Enzymes, and Cell Fusion." In The Enzymes of Biological Membranes, 371–91. Boston, MA: Springer US, 1985. http://dx.doi.org/10.1007/978-1-4684-4598-5_11.

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Krnjević, K. "Role of Calcium Ions in Learning." In Neural Mechanisms of Conditioning, 251–59. Boston, MA: Springer US, 1986. http://dx.doi.org/10.1007/978-1-4613-2115-6_16.

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Hoth, Markus. "The Fate of Calcium Ions Entering a Cell." In Integrative Aspects of Calcium Signalling, 23–33. Boston, MA: Springer US, 1998. http://dx.doi.org/10.1007/978-1-4899-1901-4_2.

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Conference papers on the topic "Calcium ions"

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Baluja, K. L., and K. T. Taylor. "Radiative transitions in calcium ions." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1986. http://dx.doi.org/10.1364/oam.1986.wg37.

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Oscillator strengths in both length and velocity approximations have been obtained for transitions between the fifteen lowest lying states of Ca III with dominant configurations 3p6, 3p54s, 3p54p, and 3p53d calculated using the program of Hibbert.1 These states (all corresponding closely to a pure LS coupling scheme) were each represented by about twenty single electron configurations that allowed for internal, semi-internal, and all-external correlations by means of single and double electron excitations to pseudoorbitals 5 ¯ s , 5 ¯ p , 4 ¯ d , 4 ¯ f . Of these correlations the most important was found to be that linking 3p2 to 3d2 arrangements, a fact not previously recognized for this ion. The excitation energies calculated for these states agree satisfactorily with the previous experimental results of Borgstrom.2 By using these calculated states of Ca III as those of the residual ion in a close-coupling calculation, oscillator strengths between various discrete states of Ca II have been calculated together with the photoionization cross section from the ground state of this ion.
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Yurchenko, V. V., A. F. Nikiforov, V. S. Semenishchev, A. F. Shabunin, A. V. Sviridov, and S. V. Nikiforov. "Sorption of calcium ions by modified montmorillonite." In PHYSICS, TECHNOLOGIES AND INNOVATION (PTI-2019): Proceedings of the VI International Young Researchers’ Conference. AIP Publishing, 2019. http://dx.doi.org/10.1063/1.5134225.

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Jarvis, P. M., D. A. J. Galvin, S. D. Blair, and C. N. McCollum. "HOW DOES CALCIUM ALGINATE ACHIEVE HAEMOSTASIS IN SURGERY?" In XIth International Congress on Thrombosis and Haemostasis. Schattauer GmbH, 1987. http://dx.doi.org/10.1055/s-0038-1643074.

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Calcium alginate (Kaltostat, Cair Ltd) is a new absorbable material for topical haemostasis in surgery. The possible mode of action, release of calcium ions in exchange for sodium was investigated in human blood.Calcium release was measured in 15 mg samples of calcium alginate placed in 20 ml of 0.9% saline, for intervals of 1, 3 or 10 minutes. To assess the effect on platelets, 3 mg of calcium alginate or surgical gauze were added to 5 ml of Heparinised (100 units) fresh blood for 2 minutes and platelet counts then made using plain blood as a control. Finally using a thrombelastograph, the activation of whole blood coagulation was assessed after a 2 minute contact with 3 mg of calcium alginate, surgical gauze or no additive as control.When calcium alginate was placed in saline, 26% of calcium ions were released in 1 minute giving a calcium ion concentration of 4.62 t 0.02 mmol/L, with only slight further release after 10 minutes to 4.82 ± 0.004 mmol/L. There was a corresponding decrease in sodium ion concentration. Adding calcium alginate to whole blood reduced the platelet count from a control value of 248 i 16 × 109/L to 222 f 15 × 109/L (p< 0.05) compared to 241 ± 15 × 109/L for surgical gauze. Similarly calcium alginate shortened whole blood coagulation time from 17-7 i 1.0 minutes control, to 12.9 ± 1-32 mins (p< 0.001) compared to 15.0 ± 1.5 mins (p< 0.02) for surgical gauze.Calcium alginate rapidly releases calcium ions in exchange for sodium on contact with blood stimulating both platelet activation and whole blood coagulation, significantly more than simple contact activation by surgical gauze.
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Kao, K. W., Y. W. Su, Y. S. Lu, Da-Jeng Yao, Shangjr Gwo, and J. Andrew Yeh. "Calcium ions detection using miniaturized InN-based sensor." In 2012 IEEE 25th International Conference on Micro Electro Mechanical Systems (MEMS). IEEE, 2012. http://dx.doi.org/10.1109/memsys.2012.6170302.

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Leibfried, D. "Experiments towards quantum information with trapped Calcium ions." In XVII international conference ICAP 2000 (Atomic Physics 17). AIP, 2001. http://dx.doi.org/10.1063/1.1354345.

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Dossary, Hind S., Fahd I. Alghunaimi, and Young C. Choi. "Produced Water Reuse for Drilling and Completion Fluids Using Ion Exchange Resins." In Abu Dhabi International Petroleum Exhibition & Conference. SPE, 2021. http://dx.doi.org/10.2118/207543-ms.

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Abstract Produced water is considered one of the largest by volume waste streams and one of the most challenging effluents in the oil and gas industry. This is due to the variety of contaminants that make up produce water. A variety of treatment methods have been studied and implemented. These methods aim to reduce the hydrocarbon content and the number of contaminants in produced water to meet the disposal, reuse, and environmental regulations. These contaminants can include dispersed oil droplets, suspended solids, dissolved solids, heavy metals, and other production chemicals. Some of those contaminates have value and can be a commodity in different applications such as bromine (Br). Bromine ions can be used to form calcium bromide, which is considered one of the most effective drilling agents and is used extensively in drilling and completion operations. This paper aims to highlight the utilization and the new extraction method of bromide ions from produced water to form calcium bromide (CaBr2). The conventional preparation of calcium-bromide drilling and completion fluids involves adding solid calcium-bromide salts to the water, which can be relatively expensive. Another method can involve the handling of strong oxidants and toxic gas to form solid calcium bromide. The novel method outlined in this paper is a cost-effective and environmentally friendly way of generating calcium bromide from produced water. The method includes processing the produced water to recover bromide ions. This is done by first passing the produced water through a resin bed, including bromine-specific ion exchange resin, where the bromide ions will adsorb/absorb onto the resin, as shown in Figure-1. The second step involves regenerating the resin with regenerant having calcium cations and water to form calcium bromide. The final stage is generating the calcium bromide in the water from the bed of resin by introducing concentrated CaCl2, forming a concentrated solution of water and calcium bromide. The developed solution will be further processed to give drilling and completion fluids. This novel method constitutes a good example of produced water utilization in different applications to minimize waste and reduce the costs of forming highly consumable materials.
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Agarwal, Ajay, W. L. Wong, K. L. Yang, S. Balakumar, N. Balasubramanian, and D. L. Kwong. "Electrical Sensing of Calcium Ions using Silicon Nanowire Array." In 2007 International Conference on Solid State Devices and Materials. The Japan Society of Applied Physics, 2007. http://dx.doi.org/10.7567/ssdm.2007.h-3-2.

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KÖhlin, A., and J. Stenflo. "HIGH AFFINITY CALCIUM BINDING TO DOMAINES OF PROTEIN C THAT ARE HOMOLOGUS TO THE EPIDERMAL GROWTH FACTOR." In XIth International Congress on Thrombosis and Haemostasis. Schattauer GmbH, 1987. http://dx.doi.org/10.1055/s-0038-1643645.

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In addition to γ-carboxyglutamic acid (Gla)-dependent calcium binding all of the vitamin K-dependent plasma proteins, except prothrombin, have one or two high affinity calcium binding sites that do not require the Gla residues. A common denominator among these proteins (factors IX, X, protein C, protein Z and protein S) is that they have domaines that are homologus to the epidermal growth factor (EGF) precursor. In factors VII,IX,X, protein C and in protein Z the aminoterminal of two EGF homology regions contain one residue of β-hydroxyaspartic acid (Hya) whereas in protein S the aminoterminal EGF homology region contains Hya and the three following contain one β-hydroxyasparagine residue each.In an attempt to elucidate the role of the EGF homology regions in the Gla independent calcium binding we have isolated a tryptic fragment (residue 44-138) from the light chain of human protein C. The fragment was isolated using a monoclonal antibody that recognizes a calcium ion stabilized epitope that is expressed both in intact protein C and in protein C lacking the Gla domaine.The antibody bound the isolated EGF homology region in the presence of calcium ions but not in EDTA containing buffer. A calcium ion titration showed half maximal binding at approximately 200 μM Ca2+. The metal ion induced conformational change in the isolated fragment was also studied with affinity purified rabbit antibodies against Gla domainless protein C. Antibodies that bound in the presence of calcium ions and that could be eluted with EDTA recognized the metal ion induced conformational change in the isolated EGF homology domain. Our results suggest that one or both of the EGF homology regions are involved in the Gla-independent high affinity calcium binding in the vitamin K-dependent plasma proteins.
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Zolnere, Kristine, Janis Liepins, and Inga Ciprovica. "The impact of calcium ions on commercially available β-galactosidase." In Baltic Conference on Food Science and Technology FOODBALT “Food for consumer well-being”. Latvia University of Agriculture. Faculty of Food Technology., 2017. http://dx.doi.org/10.22616/foodbalt.2017.017.

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Wang, Jin, Sota Yoshida, Masaki Ando, Kenji Sakai, and Toshihiko Kiwa. "Terahertz Chemical Microscope for Calcium Ions and Stress Biomarker Sensing." In 2022 47th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz). IEEE, 2022. http://dx.doi.org/10.1109/irmmw-thz50927.2022.9895468.

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Reports on the topic "Calcium ions"

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Chalutz, Edo, Michael Wisniewski, Samir Droby, Yael Eilam, and Ilan Chet. Mode of Action of Yeast Biocontrol Agents of Postharvest Diseases of Fruits. United States Department of Agriculture, June 1996. http://dx.doi.org/10.32747/1996.7613025.bard.

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In a previous BARD-supported study, three of the investigators of this research were involved in a study on biological control of postharvest diseases of citrus and deciduous fruits. Several naturally occurring, non-antibiotic producing yeast antagonists were identified. Application of some of these antagonists resulted in very high levels of biocontrol under laboratory conditions but lower efficacy in semi-commercial tests. It was felt that the lack of knowledge on the mode of action of the biocontrol agents was limiting their efficient use. The current study was aimed at narrowing this gap in our knowledge. Two specific objectives were outlined: to study the mechanism by which calcium salts enhance biocontrol activity and to determine the role, if any, of the yeast extracellular materials and/or enzymes which degrade fungal cell walls during the interaction between the antagonists, the pathogen and the host. CaCl2 but not MgCl2, inhibited spore germination, and germ-tube elongation of Botrytis cinerea, Penicillium expansum and P. digitatum in culture. It also inhibited the pectinolytic activity of the pathogens. Biocontrol of apple decay by isolate 182 of Candida oleophila, an effective biocontrol agent, was enhanced by the addition of CaCl2 whereas there was no effect on the biocontrol activity of isolate 247 of this yeast. Similarly, CaCl2 enhanced efficacy of the US-7 isolate of Pichia guilliermondii in reducing infection of P. digitatum in citrus fruit. CaCl2 by itself also reduced the infection of peel wounds and stimulated ethylene production by grapefruit peel. This antagonist exhibited a very high ability to maintain cytosolic Ca2+ homeostasis when exposed to high CaCl2 concentrations. It is postulated, therefore, that enhanced biocontrol activity by calcium is the result of direct inhibition of the pathogen by calcium ions on spore germination and metabolism and indirectly due to the ability of the biocontrol agent to maintain normal metabolism in the presence of high levels of calcium. The extracellular materials produced by P. guilliermondii in culture and on the fruit inhibited, at low concentrations, the pathogen in culture and reduced percent infection of the fruit. The direct inhibition of the pathogen by these materials may thus be involved in the mode of action of the antagonist. This study contributed to our knowledge on the action of calcium salts and the yeast antagonist extracellular materials on biocontrol activity and will contribute to a more efficient use of this technology in the control of postharvest diseases of fruits.
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O'Neill, Sharman, Abraham Halevy, and Amihud Borochov. Molecular Genetic Analysis of Pollination-Induced Senescence in Phalaenopsis Orchids. United States Department of Agriculture, 1991. http://dx.doi.org/10.32747/1991.7612837.bard.

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The project investigated the molecular genetic and biochemical basis of pollination-induced senescence of Phalaenopsis flowers. This experimental system offered unique advantages in that senescence is strictly regulated by pollination, providing the basis to experimentally initiate and synchronize senescence in populations of flowers. The postpollination syndrome in the Phalaenopsis orchid system was dissected by investigating the temporal and spatial regulation of ACC synthase gene expression. In the stigma, pollen-borne auxin induces the expression of the auxin-regulated ACC synthase (PS-ACS2) gene, resulting in ACC synthesis within 1 h following pollination. Newly formed ACC is oxidized by basal constitutive ACC oxidase to ethylene, which then induces the expression of the ethylene-regulated ACC synthase(PS-ACS1) and oxidase (ACO1) genes for further autocatalytic production of ethylene. It is speculated that during the 6-h period following pollination, emasculation leads to the production or release of a sensitivity factor that sensitizes the cells of the stigma to ethylene. ACC and ethylene molecules are translocated from the stigma to the labellum and perianth where ethylene induces the expression of PS-ACS1 and ACO1 resulting in an increased production of ACC and ethylene. Organ-localized ethylene is responsible for inrolling and senescence of the labellum and perianth. The regulation of ethylene sensitivity and signal transduction events in pollinated flowers was also investigated. The increase in ethylene sensitivity appeared in both the flower column and the perianth, and was detected as early as 4 h after pollination. The increase in ethylene sensitivity following pollination was not dependent on endogenous ethylene production. Application of linoleic and linoleic acids to Phalaenopsis and Dendrobium flowers enhanced their senescence and promoted ethylene production. Several major lipoxygenase pathway products including JA-ME, traumatic acid, trans-2-hexenal and cis-3-hexenol, also enhanced flower senescence. However, lipoxygenase appears to not be directly involved in the endogenous regulation of pollination-induced Phalaenopsis and Dendrobium flower senescence. The data suggest that short-chain saturated fatty acids may be the ethylene "sensitivity factors" produced following pollination, and that their mode of action involves a decrease in the order of specific regions i the membrane lipid bilayer, consequently altering ethylene action. Examination of potential signal transduction intermediates indicate a direct involvement of GTP-binding proteins, calcium ions and protein phosphorylation in the cellular signal transduction response to ethylene following pollination. Modulations of cytosolic calcium levels allowed us to modify the flowers responsiveness to ethylene.
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Rafaeli, Ada, Russell Jurenka, and Daniel Segal. Isolation, Purification and Sequence Determination of Pheromonotropic-Receptors. United States Department of Agriculture, July 2003. http://dx.doi.org/10.32747/2003.7695850.bard.

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Moths constitute a major group of pest insects in agriculture. Pheromone blends are utilised by a variety of moth species to attract conspecific mates, which is under circadian control by the neurohormone, PBAN (pheromone-biosynthesis-activating neuropeptide). Our working hypothesis was that, since the emission of sex-pheromone is necessary to attract a mate, then failure to produce and emit pheromone is a potential strategy for manipulating adult moth behavior. The project aimed at identifying, characterising and determining the sequence of specific receptors responsible for the interaction with pheromonotropic neuropeptide/s using two related moth species: Helicoverpa armigera and H. lea as model insects. We established specific binding to a membrane protein estimated at 50 kDa in mature adult females using a photoaffinity-biotin probe for PBAN. We showed that JH is required for the up-regulation of this putative receptor protein. In vitro studies established that the binding initiates a cascade of second messengers including channel opening for calcium ions and intracellular cAMP production. Pharmacological studies (using sodium fluoride) established that the receptor is coupled to a G-protein, that is, the pheromone-biosynthesis-activating neuropeptide receptor (PBAN-R) belongs to the family of G protein-coupled receptor (GPCR)'s. We showed that PBAN-like peptides are present in Drosophila melanogaster based on bioassay and immunocytochemical data. Using the annotated genome of D. melanogaster to search for a GPCR, we found that some were similar to neuromedin U- receptors of vertebrates, which contain a similar C-terminal ending as PBAN. We established that neuromedin U does indeed induce pheromone biosynthesis and cAMP production. Using a PCR based cloning strategy and mRNA isolated from pheromone glands of H. zea, we successfully identified a gene encoding a GPCR from pheromone glands. The full-length PBAN-R was subsequently cloned and expressed in Sf9 insect cells and was shown to mobilize calcium in response to PBAN in a dose-dependent manner. The successful progress in the identification of a gene, encoding a GPCR for the neurohormone, PBAN, provides a basis for the design of a novel battery of compounds that will specifically antagonize pheromone production. Furthermore, since PBAN belongs to a family of insect neuropeptides with more than one function in different life stages, this rationale may be extended to other physiological key-regulatory processes in different insects.
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Hunt, E. M., J. M. Hampikian, and N. D. Evans. The examination of calcium ion implanted alumina with energy filtered transmission electron microscopy. Office of Scientific and Technical Information (OSTI), April 1997. http://dx.doi.org/10.2172/505353.

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Kontak, D. J., S. Paradis, Z. Waller, and M. Fayek. Petrographic, fluid inclusion, and secondary ion mass spectrometry stable isotopic (O, S) study of Mississippi Valley-type mineralization in British Columbia and Alberta. Natural Resources Canada/CMSS/Information Management, 2022. http://dx.doi.org/10.4095/327994.

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A comprehensive study of Mississippi Valley-type base-metal deposits across the Canadian Cordillera was done to compare and contrast their features. Extensive dissolution of host rocks is followed by multiple generations of dolomite cements from early, low-temperature, fine-grained to coarser, higher temperature types that overlap with Zn-Pb sulfide minerals; late-stage calcite occludes residual porosity. Dolomite is generally chemically stoichiometric, but ore-stage types are often rich in Fe (&amp;lt;1.3 weight per cent FeO) with small sphalerite inclusions. Sphalerite-hosted fluid inclusions record ranges for homogenization temperatures (77-214°C) and fluid salinity (1-28 weight per cent equiv. NaCl±CaCl2). These data suggest fluid mixing with no single fluid type related to all sulfide mineralization. In situ secondary ion mass spectrometry (SIMS) generated delta-18OVSMOW values for carbonate minerals (13-33 permille) reflect dolomite and calcite formation involving several fluids (seawater, basinal, meteoric) over a large temperature range at varying fluid-rock ratios. Sphalerite and pyrite SIMS delta-34SVCDT values vary (8-33 permille) but in single settings have small ranges (&amp;lt;2-3 permille) that suggest sulfur was reduced via thermochemical sulfate reduction from homogeneous sulfur reservoirs. Collectively, the data implicate several fluids in the mineralizing process and suggest mixing of a sulfur-poor, metal-bearing fluid with a metal-poor, sulfide-bearing fluid.
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Wicker, Louise, Ilan Shomer, and Uzi Merin. Membrane Processing of Citrus Extracts: Effects on Pectinesterase Activity and Cloud Stability. United States Department of Agriculture, October 1993. http://dx.doi.org/10.32747/1993.7568754.bard.

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The U.S. team studied the role of cations and pH on thermolabile (TL-PE) and thermostable (TS-PE), permeation in ultrafiltration (UF) membranes, affinity to ion exchange membranes, mechanism of cation and pH activation, and effect on PE stability. An optimum pH and cation concentration exists for activity and UF permeation, which is specific for each cation type. Incomplete release of PE from a pectin complex resulted in low PE binding to cationic and anionic membranes. Incubation of PE at low pH increases the surface hydrophobicity, especially TL-PE, but the secondary structure of TL-PE is not greatly affected. The Israeli team showed that stable cloud colloidal constituents flocculate following the conversion of soluble to insoluble biopolymers. First, formation of pectic acid by pectinesterase activity is followed by the formation of calcium pectate gel. This process initiates a myriad of poorly defined reactions that result in juice clarification. Second, protein coagulation by heat resulted in flocculation of proteinacous bound cloud constituents, particularly after enzymatic pectin degradation. Pectinesterase activity is proposed to be an indirect cause for clarification; whereas binding of cloud constituents is the primary event in clarification by pectate gel and coagulated proteins. Understanding the mechanism of interaction of protein and pectic polymers is key to understanding cloud instability. Based on the above, it was hypothesized that the structure of pectin-protein coagulates plays a key role in cloud instability.
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