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Academic literature on the topic 'Calcium Wave'

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Published: 4 June 2021
Last updated: 20 February 2023

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Journal articles on the topic "Calcium Wave"

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Ishide, N., T. Urayama, K. Inoue, T. Komaru, and T. Takishima. "Propagation and collision characteristics of calcium waves in rat myocytes." American Journal of Physiology-Heart and Circulatory Physiology 259, no. 3 (September 1, 1990): H940—H950. http://dx.doi.org/10.1152/ajpheart.1990.259.3.h940.

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In myocytes, local contractions occur spontaneously and propagate as traveling waves. We observed the waves in myocytes as local changes in fura-2 fluorescence and determined some characteristics of the wave. Myocytes were enzymatically isolated from rat left ventricles and incubated with 2 microM fura-2/AM for 60 min. Microscopic fluorescence images of myocytes were recorded with a high-sensitivity video camera. The images were digitally analyzed, frame by frame, and temporal changes in local fluorescence were displayed. With the excitation wavelength at 380 nm, the darker band propagates as the traveling wave. With the excitation wavelength at 340 nm, the wave appears brighter. With the isosbestic wavelength at 360 nm, the wave is not discernible. The waves are thus considered to be traveling waves of change in local cytoplasmic calcium ion concentration (calcium wave). Velocity, amplitude, and width of the calcium waves appeared to be fairly constant during their propagation. When two waves propagating in opposite directions collided, summation of the waves did not occur. After the collision both waves disappeared. These observations support the idea that the waves propagate by inducing calcium release from adjacent sarcoplasmic reticulum. Phenomena observed during the collision indicate that there is a refractory period after the calcium transient; spatially, a refractory zone exists in the wake of the wave.
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Malhó, Rui, Ana Moutinho, Arnold van der Luit, and Anthony J. Trewavas. "Spatial characteristics to calcium signalling; the calcium wave as a basic unit in plant cell calcium signalling." Philosophical Transactions of the Royal Society of London. Series B: Biological Sciences 353, no. 1374 (September 29, 1998): 1463–73. http://dx.doi.org/10.1098/rstb.1998.0302.

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Many signals that modify plant cell growth and development initiate changes in cytoplasmic Ca 2+ . The subsequent movement of Ca 2+ in the cytoplasm is thought to take place via waves of free Ca 2+ . These waves may be initiated at defined regions of the cell and movement requires release from a reticulated endoplasmic reticulum and the vacuole. The mechanism of wave propagation is outlined and the possible basis of repetitive reticulum wave formation, Ca 2+ oscillations and capacitative Ca 2+ signalling is discussed. Evidence for the presence of Ca 2+ waves in plant cells is outlined, and from studies on raphides it is suggested that the capabilities for capacitative Ca 2+ signalling are also present. The paper finishes with an outline of the possible interrelation between Ca 2+ waves and organelles and describes the intercellular movement of Ca 2+ waves and the relevance of such information communication to plant development.
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Swann, Karl, Alex McDougall, and Michael Whitaker. "Calcium signalling at fertilization." Journal of the Marine Biological Association of the United Kingdom 74, no. 1 (February 1994): 3–16. http://dx.doi.org/10.1017/s002531540003561x.

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It is generally agreed that fertilization in deuterostomes is accompanied by a large intracellular calcium wave that triggers the onset of development, but we still do not know exactly how the calcium wave is generated. The question has two parts: how does interaction of sperm and egg initiate the calcium wave, and how does the calcium wave spread across the cell? Two provisional answers are available to the first part of the question, one involving receptor-G-protein interactions of the sort that mediate trans-membrane signal transduction in somatic cells, the other injection of an activating messenger when sperm and egg fuse. Both these ideas are being actively pursued; the dialectic is productive, albeit no synthesis is in sight. We discuss their strengths and weaknesses. The second part of the question can now be much more precisely formulated: thanks to the recent flush of interest in calcium waves in somatic cells, new ideas and new experimental tools are available. The work on somatic cells repays a debt to eggs, where the basic properties of calcium waves were first set out, ten years before they turned up in somatic cells.
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KELLER, M., J. KAO, M. EGGER, and E. NIGGLI. "Calcium waves driven by “sensitization” wave-fronts." Cardiovascular Research 74, no. 1 (April 1, 2007): 39–45. http://dx.doi.org/10.1016/j.cardiores.2007.02.006.

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Ishide, N., M. Miura, M. Sakurai, and T. Takishima. "Initiation and development of calcium waves in rat myocytes." American Journal of Physiology-Heart and Circulatory Physiology 263, no. 2 (August 1, 1992): H327—H332. http://dx.doi.org/10.1152/ajpheart.1992.263.2.h327.

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To understand the characteristics of asynchrony in spontaneously occurring increases in cytoplasmic calcium concentrations ([Ca2+]i) in the cardiac myocyte, we observed newly developed changes in regional [Ca2+]i after a physical injury to the sarcolemma. Myocytes were isolated from rat left ventricle and loaded with acetoxymethyl ester of fura-2. We analyzed dynamic changes in fluorescence images by video densitometry. After the injury was imposed, three types of responses were observed: 1) rapid contracture with steady increase in [Ca2+]i; 2) periodic development of a calcium wave; and 3) quiescence after the injury. In some myocytes with the second type of response, a sustained burst of calcium waves was observed. In myocytes in which multiple calcium waves are present simultaneously, a propagated wave can reset a cycle of wave generation at the wave focus. Waves disappear after their collision, which indicates the existence of a refractory period after the calcium transient. The wave originating from the focus with the fastest frequency dominates the whole cell. Thus dynamic changes in regional [Ca2+]i are asynchronous but are organized by the following principles: 1) a regional increase in [Ca2+]i can propagate; 2) a propagated calcium wave can reset a cycle of wave initiation at the focus; and 3) a regional calcium transient leaves a refractory period.
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Bowser, David N., and Baljit S. Khakh. "Vesicular ATP Is the Predominant Cause of Intercellular Calcium Waves in Astrocytes." Journal of General Physiology 129, no. 6 (May 15, 2007): 485–91. http://dx.doi.org/10.1085/jgp.200709780.

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Brain astrocytes signal to each other and neurons. They use changes in their intracellular calcium levels to trigger release of transmitters into the extracellular space. These can then activate receptors on other nearby astrocytes and trigger a propagated calcium wave that can travel several hundred micrometers over a timescale of seconds. A role for endogenous ATP in calcium wave propagation in hippocampal astrocytes has been suggested, but the mechanisms remain incompletely understood. Here we explored how calcium waves arise and directly tested whether endogenously released ATP contributes to astrocyte calcium wave propagation in hippocampal astrocytes. We find that vesicular ATP is the major, if not the sole, determinant of astrocyte calcium wave propagation over distances between ∼100 and 250 μm, and ∼15 s from the point of wave initiation. These actions of ATP are mediated by P2Y1 receptors. In contrast, metabotropic glutamate receptors and gap junctions do not contribute significantly to calcium wave propagation. Our data suggest that endogenous extracellular astrocytic ATP can signal over broad spatiotemporal scales.
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Nihei, O. K., A. C. Campos de Carvalho, D. C. Spray, W. Savino, and L. A. Alves. "A novel form of cellular communication among thymic epithelial cells: intercellular calcium wave propagation." American Journal of Physiology-Cell Physiology 285, no. 5 (November 2003): C1304—C1313. http://dx.doi.org/10.1152/ajpcell.00568.2002.

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We here describe intercellular calcium waves as a novel form of cellular communication among thymic epithelial cells. We first characterized the mechanical induction of intercellular calcium waves in different thymic epithelial cell preparations: cortical 1-4C18 and medullary 3-10 thymic epithelial cell lines and primary cultures of thymic “nurse” cells. All thymic epithelial preparations responded with intercellular calcium wave propagation after mechanical stimulation. In general, the propagation efficacy of intercellular calcium waves in these cells was high, reaching 80-100% of the cells within a given confocal microscopic field, with a mean velocity of 6-10 μm/s and mean amplitude of 1.4- to 1.7-fold the basal calcium level. As evaluated by heptanol and suramin treatment, our results suggest the participation of both gap junctions and P2 receptors in the propagation of intercellular calcium waves in thymic nurse cells and the more prominent participation of gap junctions in thymic epithelial cell lines. Finally, in cocultures, the transmission of intercellular calcium wave was not observed between the mechanically stimulated thymic epithelial cell and adherent thymocytes, suggesting that intercellular calcium wave propagation is limited to thymic epithelial cells and does not affect the neighboring thymocytes. In conclusion, these data describe for the first time intercellular calcium waves in thymic epithelial cells and the participation of both gap junctions and P2 receptors in their propagation.
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Jaffe, Lionel F. "Calcium waves." Philosophical Transactions of the Royal Society B: Biological Sciences 363, no. 1495 (January 11, 2008): 1311–17. http://dx.doi.org/10.1098/rstb.2007.2249.

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Waves through living systems are best characterized by their speeds at 20°C. These speeds vary from those of calcium action potentials to those of ultraslow ones which move at 1–10 and/or 10–20 nm s −1 . All such waves are known or inferred to be calcium waves. The two classes of calcium waves which include ones with important morphogenetic effects are slow waves that move at 0.2–2 μm s −1 and ultraslow ones. Both may be propagated by cycles in which the entry of calcium through the plasma membrane induces subsurface contraction. This contraction opens nearby stretch-sensitive calcium channels. Calcium entry through these channels propagates the calcium wave. Many slow waves are seen as waves of indentation. Some are considered to act via cellular peristalsis; for example, those which seem to drive the germ plasm to the vegetal pole of the Xenopus egg. Other good examples of morphogenetic slow waves are ones through fertilizing maize eggs, through developing barnacle eggs and through axolotl embryos during neural induction. Good examples of ultraslow morphogenetic waves are ones during inversion in developing Volvox embryos and across developing Drosophila eye discs. Morphogenetic waves may be best pursued by imaging their calcium with aequorins.
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Huo, Bo, Xin L. Lu, and X. Edward Guo. "Intercellular calcium wave propagation in linear and circuit-like bone cell networks." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 368, no. 1912 (February 13, 2010): 617–33. http://dx.doi.org/10.1098/rsta.2009.0221.

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In the present study, the mechanism of intercellular calcium wave propagation in bone cell networks was identified. By using micro-contact printing and self-assembled monolayer technologies, two types of in vitro bone cell networks were constructed: open-ended linear chains and looped hexagonal networks with precisely controlled intercellular distances. Intracellular calcium responses of the cells were recorded and analysed when a single cell in the network was mechanically stimulated by nano-indentation. The looped cell network was shown to be more efficient than the linear pattern in transferring calcium signals from cell to cell. This phenomenon was further examined by pathway-inhibition studies. Intercellular calcium wave propagation was significantly impeded when extracellular adenosine triphosphate (ATP) in the medium was hydrolysed. Chemical uncoupling of gap junctions, however, did not significantly decrease the transferred distance of the calcium wave in the cell networks. Thus, it is extracellular ATP diffusion, rather than molecular transport through gap junctions, that dominantly mediates the transmission of mechanically elicited intercellular calcium waves in bone cells. The inhibition studies also demonstrated that the mechanical stimulation-induced calcium responses required extracellular calcium influx, whereas the ATP-elicited calcium wave relied on calcium release from the calcium store of the endoplasmic reticulum.
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Whitaker, Michael. "Calcium at Fertilization and in Early Development." Physiological Reviews 86, no. 1 (January 2006): 25–88. http://dx.doi.org/10.1152/physrev.00023.2005.

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Fertilization calcium waves are introduced, and the evidence from which we can infer general mechanisms of these waves is presented. The two main classes of hypotheses put forward to explain the generation of the fertilization calcium wave are set out, and it is concluded that initiation of the fertilization calcium wave can be most generally explained in invertebrates by a mechanism in which an activating substance enters the egg from the sperm on sperm-egg fusion, activating the egg by stimulating phospholipase C activation through a src family kinase pathway and in mammals by the diffusion of a sperm-specific phospholipase C from sperm to egg on sperm-egg fusion. The fertilization calcium wave is then set into the context of cell cycle control, and the mechanism of repetitive calcium spiking in mammalian eggs is investigated. Evidence that calcium signals control cell division in early embryos is reviewed, and it is concluded that calcium signals are essential at all three stages of cell division in early embryos. Evidence that phosphoinositide signaling pathways control the resumption of meiosis during oocyte maturation is considered. It is concluded on balance that the evidence points to a need for phosphoinositide/calcium signaling during resumption of meiosis. Changes to the calcium signaling machinery occur during meiosis to enable the production of a calcium wave in the mature oocyte when it is fertilized; evidence that the shape and structure of the endoplasmic reticulum alters dynamically during maturation and after fertilization is reviewed, and the link between ER dynamics and the cytoskeleton is discussed. There is evidence that calcium signaling plays a key part in the development of patterning in early embryos. Morphogenesis in ascidian, frog, and zebrafish embryos is briefly described to provide the developmental context in which calcium signals act. Intracellular calcium waves that may play a role in axis formation in ascidian are discussed. Evidence that the Wingless/calcium signaling pathway is a strong ventralizing signal in Xenopus, mediated by phosphoinositide signaling, is adumbrated. The central role that calcium channels play in morphogenetic movements during gastrulation and in ectodermal and mesodermal gene expression during late gastrulation is demonstrated. Experiments in zebrafish provide a strong indication that calcium signals are essential for pattern formation and organogenesis.
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Dissertations / Theses on the topic "Calcium Wave"

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Erickson, Christopher Joseph. "Construction of a Calcium Matter-Wave Interferometer." Diss., CLICK HERE for online access, 2007. http://contentdm.lib.byu.edu/ETD/image/etd2162.pdf.

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York-Andersen, Anna Henrietta. "Investigating the calcium wave and actin dynamics at Drosophila egg activation." Thesis, University of Cambridge, 2019. https://www.repository.cam.ac.uk/handle/1810/288873.

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Egg activation is a series of highly coordinated processes that prepare the mature oocyte for embryogenesis. Typically associated with fertilisation, egg activation results in the resumption of the cell cycle, expression of maternal mRNAs and cross-linking of the vitelline membrane. While some aspects of egg activation, such as initiation factors in mammals and environmental cues in sea animals, have been well-documented, the mechanics of egg activation in many animals are still not well understood. This is especially true for animals where fertilisation and egg activation are unlinked. In order to elucidate how egg activation is regulated independently of fertilisation, I use Drosophila melanogaster as a model system. This insect provides extensive genetic tools, ease of manipulation for experimentation and is amenable for imaging. Through visualisation of calcium, Processing bodies and meiotic spindles, I show that osmotic pressure acts as an initiation cue for the calcium wave and downstream processes, including the resumption of cell cycle and the dispersion of the translational repression sites. I further show that aquaporin channels, together with external sodium ions, play a role in coordinating swelling of the oocyte in response to the osmotic pressure. I proceed to identify the requirement of internal calcium sources together with a dynamic actin cytoskeleton for a calcium wave to occur. Through co-visualisation of calcium and actin, I provide the first evidence that the calcium wave is followed by a wavefront of non-cortical F-actin at egg activation, which requires the calcium wave. Genetic analysis supports a model where changes in osmotic pressure trigger the calcium wave via stretch sensitive calcium channels in the oocyte membrane and the calcium wave is relayed by nearby channels via the actin cytoskeleton. My work concludes that the mechanism of egg activation in Drosophila is more similar to plants, compared to most vertebrates.
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Oehlschläger, Sven, Oliver W. Hakenberg, Michael Fröhner, and Manfred P. Wirth. "Age-Related Changes of Urine Calcium Excretion after Extracorporeal Shock Wave Lithotripsy due to Artificial Renal Calcium Leakage." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-133774.

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Introduction: Extracorporeal shock wave lithotripsy (ESWL) is the standard stone treatment. Increased excretion of tubular enzymes and hypercalciuria has been reported after ESWL. We investigated the importance of renally induced hypercalciuria after ESWL. Material and Methods: 30 calcium oxalate stoneformers (23 men, 7 women), mean age 53.3 (range 30–71) years, were evaluated prospectively. Plasma calcium and creatinine concentrations and 8-hour overnight urine were measured before ESWL and on the 1st and 2nd days after ESWL. To estimate the changes of tubular reabsorption, the calcium/creatinine clearance ratios were calculated. Results: Hypercalciuria (>5 mmol/24 h) was seen in 5/30 (16.7%) before, in 12/30 (40.0%) on day 1 and in 13/30 (43.3%) on day 2 after ESWL. The mean plasma levels of calcium were significantly decreased from 2.36 mmol/l before to 2.28 mmol/l on day 2 after ESWL (p< 0.01). The mean calcium/creatinine clearance ratio was significantly increased from 0.012 before to 0.019 after ESWL (p< 0.01). Before and on day 2 after ESWL, the calcium/creatinine clearance ratio was significantly correlated with the age of the patients (r = 0.33, p< 0.04). Conclusion: Our data show an age-related significantly increased urine calcium excretion after ESWL possibly due to decreased tubular calcium reabsorption
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Oehlschläger, Sven, Oliver W. Hakenberg, Michael Fröhner, and Manfred P. Wirth. "Age-Related Changes of Urine Calcium Excretion after Extracorporeal Shock Wave Lithotripsy due to Artificial Renal Calcium Leakage." Karger, 2008. https://tud.qucosa.de/id/qucosa%3A27534.

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Introduction: Extracorporeal shock wave lithotripsy (ESWL) is the standard stone treatment. Increased excretion of tubular enzymes and hypercalciuria has been reported after ESWL. We investigated the importance of renally induced hypercalciuria after ESWL. Material and Methods: 30 calcium oxalate stoneformers (23 men, 7 women), mean age 53.3 (range 30–71) years, were evaluated prospectively. Plasma calcium and creatinine concentrations and 8-hour overnight urine were measured before ESWL and on the 1st and 2nd days after ESWL. To estimate the changes of tubular reabsorption, the calcium/creatinine clearance ratios were calculated. Results: Hypercalciuria (>5 mmol/24 h) was seen in 5/30 (16.7%) before, in 12/30 (40.0%) on day 1 and in 13/30 (43.3%) on day 2 after ESWL. The mean plasma levels of calcium were significantly decreased from 2.36 mmol/l before to 2.28 mmol/l on day 2 after ESWL (p< 0.01). The mean calcium/creatinine clearance ratio was significantly increased from 0.012 before to 0.019 after ESWL (p< 0.01). Before and on day 2 after ESWL, the calcium/creatinine clearance ratio was significantly correlated with the age of the patients (r = 0.33, p< 0.04). Conclusion: Our data show an age-related significantly increased urine calcium excretion after ESWL possibly due to decreased tubular calcium reabsorption.
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Ullah, Ghanim. "COMPUTATIONAL MODELING OF CALCIUM SIGNALING FROM THE NANOSCALE TO MULTICELLULAR SYSTEMS." Ohio University / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1160584521.

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Edwards, James Roy. "Modelling Chemical Communication in Neuroglia." Thesis, The University of Sydney, 2007. http://hdl.handle.net/2123/2184.

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In vivo many forms of glia utilise both intercellular and extracellular pathways in the form of IP3 permeable gap junctions and cytoplasmic ATP diffusion to produce calcium waves. We introduce a model of ATP and Ca2+ waves in clusters of glial cells in which both pathways are included. Through demonstrations of its capacity to replicate the results of existing theoretical models of individual pathways and to simulate experimental observations of retinal glia the validity of the model is confirmed. Characteristics of the waves resulting from the inclusion of both pathways are identified and described.
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Edwards, James Roy. "Modelling Chemical Communication in Neuroglia." University of Sydney, 2007. http://hdl.handle.net/2123/2184.

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Master of Science
In vivo many forms of glia utilise both intercellular and extracellular pathways in the form of IP3 permeable gap junctions and cytoplasmic ATP diffusion to produce calcium waves. We introduce a model of ATP and Ca2+ waves in clusters of glial cells in which both pathways are included. Through demonstrations of its capacity to replicate the results of existing theoretical models of individual pathways and to simulate experimental observations of retinal glia the validity of the model is confirmed. Characteristics of the waves resulting from the inclusion of both pathways are identified and described.
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Higashi, Cristiane. ""Investigação do processo de obtenção de aluminatos de bário e cálcio para construção e caracterização de catodos termiônicos impregnados para aplicação em dispositivos de microondas de potência"." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/85/85134/tde-31052007-150633/.

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O presente trabalho descreve os processos de preparação do aluminato de bário e cálcio, material emissor de elétrons, empregados nos catodos do tipo impregnado para utilização em uma válvula de microondas do tipo TWT. Os catodos investigados constituem-se de uma pastilha de tungstênio porosa impregnada com aluminato de bário e cálcio com proporção molar 5:3:2. Para a síntese do aluminato, utilizaram-se três diferentes métodos: reação em estado sólido, precipitação e cristalização. A termogravimetria auxiliou na consolidação dos procedimentos de preparação dos aluminatos de modo a definir os parâmetros de pirólise/calcinação. Verificou-se que a técnica que apresentou melhores características de síntese foi o método da cristalização, pois esta apresentou uma menor temperatura de formação do aluminato (800ºC) em atmosfera oxidante (O2), quando comparada às técnicas de reação em estado sólido e de precipitação (temperatura de 1000ºC em atmosfera redutora – H2). Utilizou-se o conceito da distribuição da função trabalho prática (PWFD) de Miram para a caracterização termiônica dos catodos impregnados. Empregando-se este método, foi possível traçar o perfil termiônico do catodo com aluminato de bário e cálcio. As curvas PWFD apresentaram a função trabalho média do catodo aluminato de, aproximadamente, 2,00 eV.
In the present work it is described the barium calcium aluminate manufacture processes employed to produce impregnated cathodes to be used in a traveling-wave tube (TWT). The cathodes were developed using a tungsten body impregnated with barium and calcium aluminate with a 5:3:2 proportion (molar). Three different processes were investigated to obtain this material: solid-state reaction, precipitation and crystallization. Thermal analysis, thermogravimetry specifically, supported to determine an adequate preparation procedure (taking into account temperature, time and pirolisys atmosphere). It was verified that the crystallization showed a better result when compared to those investigated (solid-state reaction and precipitation techniques – formation temperature is about 1000ºC in hydrogen atmosphere), whereas it presented the lower formation temperature (800ºC) in oxidizing atmosphere (O2). It was used the practical work function distribution theory (PWFD) of Miram to characterize thermionic impregnated cathode. The PWFD curves were used to characterize the barium-calcium aluminate cathode. PWFD curves shown that the aluminate cathode work function is about 2,00 eV.
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Nottingham, Mark. "Resonance photo-ionisation mass spectrometry techniques for the analysis of heavy noble gas isotopes in extra-terrestrial samples." Thesis, University of Manchester, 2017. https://www.research.manchester.ac.uk/portal/en/theses/resonance-photoionisation-mass-spectrometry-techniques-for-the-analysis-of-heavy-noble-gas-isotopes-in-extraterrestrial-samples(93bc14bd-d13f-4d91-ad16-e264754a6e79).html.

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The field of noble gas mass spectrometry is a rapidly developing one. There is a sustained requirement for continuous development of instrumentation in order to allow researchers to answer critical questions facing their respective fields. Within planetary science, the question of whether our solar system is 'typical', has been a driving force behind many lines of research. This project sought to build upon the strong instrumental base of the Isotope Geochemistry and Cosmochemistry group of the University of Manchester, in order to develop the Resonance Ionisation Mass Spectrometer for Krypton Isotopes. From that basis, it then sought to develop techniques and protocols for the analysis of extra-terrestrial samples, particularly those of very low mass. The thesis is broken down into three studies. The first involved the development of the mechanisms used to fill the Xe-Ar four-wave mixing cell. This section covers the development, implementation, and characterisation of the newly installed mass flow controllers. The additional control over the mixing ratio granted allowed an eightfold increase to the sensitivity of the instrument. The reproducibility of the gas ratio is consistently shown throughout, and has ultimately reduced the tuning time of the instrument from a number of weeks to a day. The second section details the required procedures involved in data reduction, and the development of protocols and software for the RIMSKI instrument. A range of approaches are assessed, including a novel approach to cosmic ray exposure age calculations. The methods are discussed and implemented on extra-terrestrial samples, the Stannern eucrite and the Bereba eucrite. Finally, the analytical limits of the RIMSKI instrument are expanded via the measurement of the krypton systems of individual calcium-aluminium-rich inclusions. It is observed that Allende CAIs show a trapped component, Br-derived Kr, as well as an anomalous 'heavy Kr' component (one that is enriched in 86Kr). It is additionally noted that there is a lack of cosmogenic krypton to be found in all but one of the measured inclusions. The implications of these findings are discussed.
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Fog, Lotte S. "Coherent production of neutral pions on '1'2C and '4'0Ca." Thesis, University of Glasgow, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.368746.

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Books on the topic "Calcium Wave"

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Kazuhide, Inoue, Watanabe Y, and Nihon Shinkei Seishin Yakuri Gakkai. Congress, eds. Calcium ion modulators: The new wave of psychotropic drugs. Australia: Harwood Academic Publishers, 1998.

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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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Bock, Gregory R., and Kate Ackrill, eds. Ciba Foundation Symposium 188 - Calcium Waves, Gradients and Oscillations. Chichester, UK: John Wiley & Sons, Ltd., 1995. http://dx.doi.org/10.1002/9780470514696.

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Thourel, L. Calcul et conception des dispositifs en ondes centimétriques et millimétriques. Toulouse: Cepadues, 1988.

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(Editor), I. Kazuhide, and Y. Watanabe (Editor), eds. Calcium Ion Modulators: The New Wave of Psychotropic Drugs. CRC, 1998.

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Bock, Gregory R., and Kate Ackrill. Calcium Waves, Gradients and Oscillations. Wiley & Sons, Incorporated, John, 2008.

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Symposium, CIBA Foundation, Gregory R. Bock, and Kate Ackrill. Calcium, Waves, Gradients and Oscillations. Wiley & Sons, Limited, John, 2007.

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Symposium, Ciba Foundation. Calcium, Waves, Gradients and Oscillations. Wiley & Sons, Incorporated, John, 2008.

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Symposium, CIBA Foundation. Calcium, Waves, Gradients and Oscillations - Symposium No. 188. John Wiley & Sons, 1995.

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Nixdorff, Uwe, Stephan Achenbach, Frank Bengel, Pompillio Faggiano, Sara Fernández, Christian Heiss, Thomas Mengden, et al. Imaging in cardiovascular prevention. Oxford University Press, 2015. http://dx.doi.org/10.1093/med/9780199656653.003.0006.

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Imaging tools in preventive cardiology can be divided into imaging modalities to assess pre-clinical and clinical atherosclerosis and functional assessments of vascular function or vascular inflammation. To calculate the likelihood of pre-clinical atherosclerosis intima-media thickness as well as coronary calcium scoring are most frequently used. However, beyond these two there are other parameters derived by ultrasound and multi-detector computed tomography as well as magnetic resonance imaging and nuclear/molecular imaging which are discussed in the chapter. Functional tests include flow-mediated dilatation, pulse wave analysis, and the ankle-brachial index. In clinical research other invasive measurements such as intravascular ultrasound/virtual histology/elastography, optical coherence tomography as well as thermography are being used. However, their value in clinical prevention still needs to be established.
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Book chapters on the topic "Calcium Wave"

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Falcke, Martin. "Building a Wave – Models of the Puff-to-Wave Transition." In Understanding Calcium Dynamics, 287–323. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-540-44878-5_13.

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Manne, Joseph S., Robert Douenias, Gary S. Karlin, and Arthur D. Smith. "Study of the Aggregation of Calcium Oxalate Crystals Using Shock Wave Lithotripsy." In Shock Wave Lithotripsy 2, 49–53. Boston, MA: Springer US, 1989. http://dx.doi.org/10.1007/978-1-4757-2052-5_10.

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Yang, Wei, Hsiau-wei Lee, and Jenny J. Yang. "Analysis and Evaluation of Rational Designed Calcium Binding Sites in CD2." In Peptides: The Wave of the Future, 811–13. Dordrecht: Springer Netherlands, 2001. http://dx.doi.org/10.1007/978-94-010-0464-0_379.

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Lallouette, Jules, and Hugues Berry. "Topology Drives Calcium Wave Propagation in 3D Astrocyte Networks." In Proceedings of the European Conference on Complex Systems 2012, 453–63. Cham: Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-00395-5_56.

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Trinchieri, A., A. Mandressi, P. Luongo, E. Micheli, D. Tiranti, and E. Pisani. "Pharmacological Prevention of Renal Calcium Stones After Extracorporeal Shock-Wave Lithotripsy." In Urolithiasis, 805–7. Boston, MA: Springer US, 1989. http://dx.doi.org/10.1007/978-1-4899-0873-5_256.

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Kawashima, Hiroki, Umakshi Sajnani, Masahiro Shimizu, and Koh Hosoda. "Observation of Calcium Wave on Physical Stimulus for Realizing Cell Tactile Sensor." In Biomimetic and Biohybrid Systems, 255–62. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-95972-6_27.

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Chang, Hengtai, Ji Bian, Jian Sun, Wensheng Zhang, and Cheng-Xiang Wang. "A Novel Channel Model for Molecular Communications Based on Inter-cellular Calcium Wave." In Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, 287–99. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-90802-1_25.

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Okada, Yoshihiko, Tsuguya Masuda, Minori Takada, Lingling Xu, and Takeshi Mitsuda. "Relationship between NMR 29Si Chemical Shifts and FT-IR Wave Numbers in Calcium Silicates." In Nuclear Magnetic Resonance Spectroscopy of Cement-Based Materials, 69–78. Berlin, Heidelberg: Springer Berlin Heidelberg, 1998. http://dx.doi.org/10.1007/978-3-642-80432-8_4.

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Lindgren, Martin, Thorlief Thorlin, Maria Gustavsson, Sheila Galt, Yngve Hamnerius, and Lars Rönnbäck. "Experimental Setup for Study of Calcium Wave Propagation in Astroglial Cells Exposed to ELF MF." In Electricity and Magnetism in Biology and Medicine, 593–95. Boston, MA: Springer US, 1999. http://dx.doi.org/10.1007/978-1-4615-4867-6_141.

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Jafri, M. Saleet, and Aman Ullah. "Calcium Waves." In Encyclopedia of Computational Neuroscience, 1–11. New York, NY: Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-7320-6_182-1.

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Conference papers on the topic "Calcium Wave"

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Yang*, Yahua, Gang Gao, Bin Zhao, and Zhixian Gui. "S-wave velocity estimation for calcium-bearing shaly sand formation." In International Geophysical Conference, Qingdao, China, 17-20 April 2017. Society of Exploration Geophysicists and Chinese Petroleum Society, 2017. http://dx.doi.org/10.1190/igc2017-135.

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Lu, X. Lucas, Bo Huo, Andrew D. Baik, and X. Edward Guo. "Intercellular Calcium Wave Propagation in Linear and Circuit-Like Bone Cell Networks." In ASME 2010 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2010. http://dx.doi.org/10.1115/sbc2010-19365.

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Intracellular calcium ([Ca2+]i) transients in response to mechanical stimulation can be propagated to neighboring cells in bone cell networks, which provides an essential mechanism for cell-cell communication in bone. Transfer of intracellular second messengers (e.g., IP3 and Ca2+) through gap junction pores and the diffusion of extracellular ATP to activate membrane receptors have long been conjectured as the two major pathways for intercellular Ca2+ wave propagation [1]. In this study, by comparing the calcium wave in open-end linear and looped circuit-like cell chains, the roles of gap junction intercellular communication (GJIC) and extracellular ATP diffusion in calcium wave propagation in bone cell networks were examined. The results were further confirmed with pathway-inhibitor studies performed on linear cell chains.
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Yang, Y., X. Yin, and G. Gao. "Calcium-bearing Sandstone Reservoir Identification Based on an Improved S-wave Velocity." In 80th EAGE Conference and Exhibition 2018. Netherlands: EAGE Publications BV, 2018. http://dx.doi.org/10.3997/2214-4609.201800991.

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Bonitz, Frank, Ralf Wagner, Heike Dreuse, and Hans-Werner Zier. "Time domain reflectometry to monitor in-situ drying behavior of calcium sulfate foam." In 2021 13th International Conference on Electromagnetic Wave Interaction with Water and Moist Substances (ISEMA). IEEE, 2021. http://dx.doi.org/10.1109/isema49699.2021.9508271.

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Shala, Kastriot, Bin Yang, Teng Teng To, Richard W. Pickersgill, Norbert Krauss, and Robert Donnan. "Millimeter wave spectrometry of glucose and a calcium-binding protein using a vector network analyzer." In 2010 35th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz 2010). IEEE, 2010. http://dx.doi.org/10.1109/icimw.2010.5612418.

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Pérez-Requejo, J. L., J. Aznar, T. Santos, and J. Vallés. "ANTIPLATELET ACTIVITY OF DYPIRIDAMOLE IN HUMAN WHOLE BLOOD WITH PHYSIOLOGICAL LEVELS OF IONIZED CALCIUM." In XIth International Congress on Thrombosis and Haemostasis. Schattauer GmbH, 1987. http://dx.doi.org/10.1055/s-0038-1643421.

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In spite of the windespread use of dypiridanole (DP) as an anti thrombotic drug, its usefullnes has not been generally proved. The clinical trials have been somewhat inconclusive or challenge and most of the studies were not able to snow a clear inhibitory action of DP on platelet aggregation. Using the impedance aggre gometer it has been shewn that the antiplatelet action of DP can be demonstrated in whole blood (WB) ex vivo an it was suggested that this was due to the inhibition of adenosin reuptake by the red cells. We have recently described (Thrombos & Haerostas 54: 799, 1985) a method, that detects the early platelet-collagen interaction in whole blood, which has been called BASIC wave. Using slight modifications of the BASIC wave method, we were able to study the platelet-collagen interactions in native WB with physio logical levels of calcium and its inhibition by DP ex vivo. We performed the BASIC wave in 25 human healthy volunteers in WB without sodium citrate, WB with citrate and citrated platelet rich plasma (PRP) before and 2 hours after the oral administration of DP 3mg/kg. We observed that in WB with citrate, DP produced a 66% inhibition of the BASIC wave (p<0.005) in PRP the inhibition was 40.7% (p< 0.005) but it was a non-significant 21.7% in WB without citrate. Using hirudin 40U/ml as anticoagulant, the inhi bition was the same as in WB without citrate. There were no correlation between the oral dose and the DP plasma levels or with the observed inhibition of the BASIC wave. We postulate that the antiplatelet action of DP is only demonstrable in citrated samples, beer negligible in native blood with physiological levels of calcium. The present report could explain the lack of firm da ta supporting the antithrombotic action of DP in clinical trials. Furthermore, the method here presented allows the study of anti -thrombotic drugs ex vivo in whole blood in its normal calcium environement.
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Gool, R. Van, C. P. M. Reutelingsperger, G. Hornstra, and H. C. Hemkera. "PLATELET FUNCTION IN PLASMA AT PHYSIOLOGICAL CALCIUM CONCENTRATION. THE USE OF VAC AS AN ANTICOAGULANT." In XIth International Congress on Thrombosis and Haemostasis. Schattauer GmbH, 1987. http://dx.doi.org/10.1055/s-0038-1643764.

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We have purified from human placenta an anticoagulatory protein (VAC, Mr= 32,000), which inhibits phospholipid dependent procoagulant reactions through a calcium dependent high affinity binding to procoagulant phospholipids..When tested in citrated platelet rich plasma (cPRP), VAC does not affect platelet aggregation and secretion in reponse to ADP, collagen and thrombin. Purified VAC (0.05 μM, final concentration; f.c.) was used as an anticoagulant to prepare PRP (VAC-PRP). Platelet aggregation (optical density method) and release of newly absorbed 14C-sero-tonin (5HT) in response to adenosine diphospate (ADP) were measured and compared with platelet responses incPRP obtained simultaneously fromthe same donor.The response of ADP stimulated platelets in VAC-PRP differs strikingly from that in cPRP. In the latter, platelets react with a dose-dependent primary aggregation, followed by a thrombin (Ila)-independent second wave of aggregation associated with 5HT-secre-tion.Platelets in VAC-PRP, however, demonstratean increased primary aggregation in responseto ADP, which is followed by a IIa-mediated second wave of aggregation and 5HT-secretion.Increasing the VAC concentration does not affect the primary aggregation response, but delayed the IIa-dependent secondary events in a dose-dependent way. At 0.5 μ M VAC, platelets react to ADP (10 μM f.c.) with reversible aggregation only. No matter this high ADP-dose, secretion reaction does not occur. At this VAC concentration, epinephrine (5 μM f.c.) does not cause aggregation and 5HT-release at all, whereas incPRP both reactions occur quite readily. Although in VAC-PRP, epinephrine retains its synergistic effect on ADP to aggregate platelets, no 5HT release was ever observed and the resulting aggregation was alwaysreversible It is concluded that VAC is a suitable anticoagulant to investigate platelet function in the presence of physiological calcium concentration. Since platelet aggregation and release appear very different from results obtained in the usual way (cPRP, low calcium concentration) the physiological meaning of this latter method needs re-evaluation. Finally, our results cast severe doubt on epinephrine as an important platelet stimulant under physiological conditions.
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Bridges, William B., and William M. Bruno. "Powdered dielectric guides for millimeter waves." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1986. http://dx.doi.org/10.1364/oam.1986.mh1.

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Low-loss dielectric powders have been used as the core material of dielectric waveguides in the microwave and millimeter wave regions. Both flexible guides and planar circuits analogous to fiber and integrated optical components have been realized. Transmission losses <10 dB/m and ring resonator Qs of 2000 are obtained at 94 GHz. Bending losses were found to be insignificant for radii of curvature greater than a few centimeters. Directional couplers with fixed and variable coupling were investigated. Barium tetratitanate, nickel aluminum titanate, and magnesium calcium titanate were among the lowest-loss powders studied, exhibiting effective dielectric constants of 3.5-6 in packed powder form. Teflon was used as the cladding material for flexible waveguides, and Teflon, polypropylene, and polystyrene were used as rigid substrates for the planar dielectric channel waveguides.
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Chesney, C. M., and D. D. Pifer. "EFFECT OF Ca2+ and Mg2+ ON PLATELET ACTIVATING FACTOR (PAF) INDUCED AGGREGATION AND SPECIFIC BINDING TO HUMAN PLATELETS." In XIth International Congress on Thrombosis and Haemostasis. Schattauer GmbH, 1987. http://dx.doi.org/10.1055/s-0038-1642879.

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Gel filtered human platelets (GFP) collected in Tyrode's buffer containing 0.5 mM Ca+2, ImM Mg+2, and 0.35% albumin exhibit high affinity binding of 3H-PAF with a Kd of 0.109 α 0.029 nM (mean α SD; n=13) and 267 α 70 sites per platelet. When fibrinogen (1.67 mg/ml final concentration) is added to these GFP preparations biphasic aggregation is observed with PAF (4 nM). Normal aggregation is also observed with other platelet agonists including ADP, epinephrine, collagen, arachidonic acid, A23187 and thrombin. If GFP is prepared without added Ca+2 or Mg+2 in the presence of 3mM EDTA, platelets do not aggregate in response to PAF. However the number of specific binding sites remains unchanged (387 per platelet) with some decrease in affinity of binding (Kd = 0.2l4nM). In the presence of ImM Mg+2 there is no significant difference in binding kinetics over a range of Ca+2 concentrations (0-2mM). On the other hand the calcium channel blocker verapamil (5-10uM) exhibits competitive inhibition of 3H-PAF as analyzed by Lineweaver-Burk plots. Specific binding of 3H-PAF to GFP in the presence of ImM Mg+2 and ImM EGTA shows Kd of 0.l66nM but with increase in specific binding sites to 665. Despite increase in number of sites and no change in binding affinity, GFP under these conditions does not exhibit platelet aggregation with PAF in doses up to 80 nM.From these data it appears that external Ca+2 is not necessary for specific binding of 3H-PAF to its high affinity receptor. However, calcium does appear to be necessary for second wave aggregation with PAF. While Mg+2 appears to enhance 3H-PAF binding to platelets Mg+2 cannot substitute for Ca+2 in PAF induced platelet aggregation. Although verapamil appears to competitively inhibit binding of PAF to GFP it is not clear whether the inhibition is due to competition at or near the actual PAF receptor or at a site involving the calcium channel.
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Courjaret, Raphael, and Khaled Machaca. "Store Operated Calcium Entry Controls Intracellular Calcium Waves In Xenopus Oocytes." In Qatar Foundation Annual Research Conference Proceedings. Hamad bin Khalifa University Press (HBKU Press), 2014. http://dx.doi.org/10.5339/qfarc.2014.hbpp0217.

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Reports on the topic "Calcium Wave"

1

Antoun, Tarabay H., and Donald R. Curran. Wave Propagation in Intact and Jointed Calcium Carbonate (CaCO3) Rock. Fort Belvoir, VA: Defense Technical Information Center, March 1996. http://dx.doi.org/10.21236/ada305457.

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