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Artículos de revistas sobre el tema "Cycle du carbonate de calcium (CaCO3)"

Autor: Grafiati

Publicado: 25 de mayo de 2024

Última modificación: 19 de julio de 2025

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1

Zou, Zhaoyong, Wouter J. E. M. Habraken, Galina Matveeva, et al. "A hydrated crystalline calcium carbonate phase: Calcium carbonate hemihydrate." Science 363, no. 6425 (2019): 396–400. http://dx.doi.org/10.1126/science.aav0210.

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As one of the most abundant materials in the world, calcium carbonate, CaCO3, is the main constituent of the skeletons and shells of various marine organisms. It is used in the cement industry and plays a crucial role in the global carbon cycle and formation of sedimentary rocks. For more than a century, only three polymorphs of pure CaCO3—calcite, aragonite, and vaterite—were known to exist at ambient conditions, as well as two hydrated crystal phases, monohydrocalcite (CaCO3·1H2O) and ikaite (CaCO3·6H2O). While investigating the role of magnesium ions in crystallization pathways of amorphous

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2

Battaglia, Gianna, Marco Steinacher, and Fortunat Joos. "A probabilistic assessment of calcium carbonate export and dissolution in the modern ocean." Biogeosciences 13, no. 9 (2016): 2823–48. http://dx.doi.org/10.5194/bg-13-2823-2016.

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Abstract. The marine cycle of calcium carbonate (CaCO3) is an important element of the carbon cycle and co-governs the distribution of carbon and alkalinity within the ocean. However, CaCO3 export fluxes and mechanisms governing CaCO3 dissolution are highly uncertain. We present an observationally constrained, probabilistic assessment of the global and regional CaCO3 budgets. Parameters governing pelagic CaCO3 export fluxes and dissolution rates are sampled using a Monte Carlo scheme to construct a 1000-member ensemble with the Bern3D ocean model. Ensemble results are constrained by comparing

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3

Gong, Dehong, Zhongxiao Zhang, and Ting Zhao. "Decay on Cyclic CO2 Capture Performance of Calcium-Based Sorbents Derived from Wasted Precursors in Multicycles." Energies 15, no. 9 (2022): 3335. http://dx.doi.org/10.3390/en15093335.

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In order to obtain the cheap waste calcium-based sorbent, three wasted CaCO3 precursors, namely carbide slag, chicken eggshells, and analytical reagent-grade calcium carbonate, were selected and prepared at 700 °C to form calcium-based sorbents for CO2 capture. TGA was used to test the CO2 uptake performance of each calcium-based sorbent in 20 cycles. To identify the decay mechanism of CO2 uptake with an increasing number of cycles, all calcium-based sorbents were characterized by using XRF, XRD, and N2 adsorption. The specific surface area of calcium-based sorbents was used to redefine the fo

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4

Fischer, M., D. N. Thomas, A. Krell, et al. "Quantification of ikaite in Antarctic sea ice." Cryosphere Discussions 6, no. 1 (2012): 505–30. http://dx.doi.org/10.5194/tcd-6-505-2012.

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Abstract. Calcium carbonate precipitation in sea ice can increase pCO2 during precipitation in winter and decrease pCO2 during dissolution in spring. CaCO3 precipitation in sea ice is thought to potentially drive significant CO2 uptake by the ocean. However, little is known about the quantitative spatial and temporal distribution of CaCO3 within sea ice. This is the first quantitative study of hydrous calcium carbonate, as ikaite, in sea ice and discusses its potential significance for the carbon cycle in polar oceans. Ice cores and brine samples were collected from pack and land fast sea ice

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5

Battaglia, G., M. Steinacher, and F. Joos. "A probabilistic assessment of calcium carbonate export and dissolution in the modern ocean." Biogeosciences Discussions 12, no. 24 (2015): 20223–82. http://dx.doi.org/10.5194/bgd-12-20223-2015.

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Abstract. The marine cycle of calcium carbonate (CaCO3) is an important element of the carbon cycle and co-governs the distribution of carbon and alkalinity within the ocean. However, CaCO3 fluxes and mechanisms governing CaCO3 dissolution are highly uncertain. We present an observationally-constrained, probabilistic assessment of the global and regional CaCO3 budgets. Parameters governing pelagic CaCO3 export fluxes and dissolution rates are sampled using a Latin-Hypercube scheme to construct a 1000 member ensemble with the Bern3D ocean model. Ensemble results are constrained by comparing sim

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6

Chafidz, Achmad. "Polypropylene/CaCO<sub>3</sub> Nanocomposites Fabricated Using Masterbatch: Effect of Nano-CaCO<sub>3</sub> Loadings and Re-Processing on the Melting Properties." Materials Science Forum 1067 (August 10, 2022): 73–78. http://dx.doi.org/10.4028/p-2u9f04.

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Polypropylene filled calcium carbonate (CaCO3) nanocomposites were fabricated by employing melt blending/compounding method using masterbatch. To investigate the efffect of reprocessing on the melting properties of PP/CaCO3 nanocomposites, the melt compounding process was conducted twice (two cycles). The effect of nano-CaCO3 loadings (i.e. 5, 10 and 15 wt%) on the melting properties of PP/CaCO3 nanocomposites were also studied. The meling properties of the nanocomposites were analyzed by using a DSC (Differential Scanning Calorimetry). Additionally, the nanocomposites samples were also analyz

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7

Dieckmann, G. S., G. Nehrke, C. Uhlig, et al. "Brief communication: ikaite (CaCO<sub>3</sub>*6H<sub>2</sub>O) discovered in Arctic sea ice." Cryosphere Discussions 4, no. 1 (2010): 153–61. http://dx.doi.org/10.5194/tcd-4-153-2010.

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Abstract. We report for the first time on the discovery of calcium carbonate crystals as ikaite (CaCO3*6H2O) in sea ice from the Arctic (Kongsfjorden, Svalbard). This finding demonstrates that the precipitation of calcium carbonate during the freezing of sea ice is not restricted to the Antarctic, where it was observed for the first time in 2008. This finding is an important step in the quest to quantify its impact on the sea ice driven carbon cycle and should in the future enable improvement parametrization sea ice carbon models.

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8

Dieckmann, G. S., G. Nehrke, C. Uhlig, et al. "Brief Communication: Ikaite (CaCO<sub>3</sub>·6H<sub>2</sub>O) discovered in Arctic sea ice." Cryosphere 4, no. 2 (2010): 227–30. http://dx.doi.org/10.5194/tc-4-227-2010.

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Abstract. We report for the first time on the discovery of calcium carbonate crystals as ikaite (CaCO3·6H2O) in sea ice from the Arctic (Kongsfjorden, Svalbard) as confirmed by morphology and indirectly by X-ray diffraction as well as XANES spectroscopy of its amorophous decomposition product. This finding demonstrates that the precipitation of calcium carbonate during the freezing of sea ice is not restricted to the Antarctic, where it was observed for the first time in 2008. This observation is an important step in the quest to quantify its impact on the sea ice driven carbon cycle.

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9

Rigual Hernández, Andrés S., Thomas W. Trull, Scott D. Nodder, et al. "Coccolithophore biodiversity controls carbonate export in the Southern Ocean." Biogeosciences 17, no. 1 (2020): 245–63. http://dx.doi.org/10.5194/bg-17-245-2020.

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Abstract. Southern Ocean waters are projected to undergo profound changes in their physical and chemical properties in the coming decades. Coccolithophore blooms in the Southern Ocean are thought to account for a major fraction of the global marine calcium carbonate (CaCO3) production and export to the deep sea. Therefore, changes in the composition and abundance of Southern Ocean coccolithophore populations are likely to alter the marine carbon cycle, with feedbacks to the rate of global climate change. However, the contribution of coccolithophores to CaCO3 export in the Southern Ocean is unc

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10

Huang, Xinran, Jiang Li, Mingxiao Su, Xiyun Jiao, Qiuming Wu, and Zhe Gu. "Exploration of Microbially Induced Carbonate Precipitation Technology for the Protection of Soil on Agricultural Drainage Ditch Slopes." Water 17, no. 13 (2025): 2010. https://doi.org/10.3390/w17132010.

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Microbially induced carbonate precipitation (MICP) offers an eco-friendly approach to stabilize porous materials. This study evaluates its feasibility for protecting agricultural drainage ditch slopes through laboratory tests. Liquid experiments assessed calcium carbonate (CaCO3) precipitation rates under varying bacteria–cementation solution ratios (BCR), cementation solution concentrations (1–2 mol/L), and urease inhibitor (NBPT) contents (0–0.3%). Soil experiments further analyzed the effects of solidified layer thickness (4 cm vs. 8 cm) and curing cycles on soil stabilization. The results

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11

Anggoro, B. M., and A. Sugandi. "Effect of Calcium Carbonate Application on Initial Vegetative Growth of Oil Palm Planted on Deep Peat." IOP Conference Series: Earth and Environmental Science 1308, no. 1 (2024): 012027. http://dx.doi.org/10.1088/1755-1315/1308/1/012027.

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Abstract The main challenge of planting oil palm on deep peat is naturally acidic soil pH which affects rooting development and activity and uptake of nutrients. Considering one life cycle of oil palm can be up to ≥20 years, ensuring optimum growth of palms since its initial planting is essential. Calcium carbonate (CaCO3) application is a standard practice to increase soil pH, including on peat soils. However, the effective rate and effects of its application to palm growth are still lacking. This trial is aimed to see the effect of CaCO3 application on the vegetative growth of oil palms plan

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12

Castro-Sanguino, C., YM Bozec, and PJ Mumby. "Dynamics of carbonate sediment production by Halimeda: implications for reef carbonate budgets." Marine Ecology Progress Series 639 (April 2, 2020): 91–106. http://dx.doi.org/10.3354/meps13265.

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Reef carbonate production and sediment generation are key processes for coral reef development and shoreline protection. The calcified green alga Halimeda is a major contributor of calcareous sediments, but rates of production and herbivory upon Halimeda are driven by biotic and environmental factors. Consequently, estimating rates of calcium carbonate (CaCO3) production and transformation into sediment requires the integration of Halimeda gains and losses across habitats and seasons, which is rarely considered in carbonate budgets. Using seasonal rates of recruitment, growth, senescence and h

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13

Noor Zuhaira, Abd Aziz, and Mohamed Rahmah. "Effect of Calcium Carbonate on Thermal Properties of CaCO₃/Kenaf/HDPE and CaCO₃/Rice Husk/HDPE Composites." Advanced Materials Research 812 (September 2013): 175–80. http://dx.doi.org/10.4028/www.scientific.net/amr.812.175.

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In this research, the thermal properties of 30% filler loading of natural fibers with varying filler loadings of calcium carbonate (CaCO3) were studied. CaCO3 was compounded using twin-screw extruder with rice husk/high density polyethylene (HDPE) and kenaf/HDPE composites to produce composites. Compounded composites were prepared and tested for thermal properties. The thermal stability of the components was examined by thermogravimetric analysis (TGA) and differential scanning calorimetric (DSC) to identify the influence of CaCO3 filler loading on thermal properties of the composites. The cyc

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14

Pinsonneault, A. J., H. D. Matthews, E. D. Galbraith, and A. Schmittner. "Calcium carbonate production response to future ocean warming and acidification." Biogeosciences Discussions 8, no. 6 (2011): 11863–97. http://dx.doi.org/10.5194/bgd-8-11863-2011.

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Abstract. Anthropogenic carbon dioxide (CO2) emissions are acidifying the ocean, affecting calcification rates in pelagic organisms and thereby modifying the oceanic alkalinity cycle. However, the responses of pelagic calcifying organisms to acidification vary widely between species, contributing uncertainty to predictions of atmospheric CO2 and the resulting climate change. Meanwhile, ocean warming caused by rising CO2 is expected to drive increased growth rates of all pelagic organisms, including calcifiers. It thus remains unclear whether anthropogenic CO2 will ultimately increase or decrea

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15

Vincent, Julia, Béatrice Colin, Isabelle Lanneluc, et al. "La biocalcification bactérienne en milieu marin et ses applications." Matériaux & Techniques 110, no. 6 (2022): 606. http://dx.doi.org/10.1051/mattech/2023004.

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La précipitation du carbonate de calcium (CaCO3) biologiquement induite en milieu marin joue un rôle important dans le cycle biogéochimique du carbone. Cette biocalcification est gouvernée par quatre facteurs clés : le taux de carbone inorganique dissous dont dépend le taux de carbonates (CO32−) dans le système, le taux d’ions calciques (Ca2+), le pH et la disponibilité des sites de nucléation c’est-à-dire des zones de cristallisation primaire de la phase solide du minéral. Les bactéries impliquées dans la biocalcification marine vont alors agir sur un ou plusieurs de ces facteurs. Ce processu

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16

Planchat, Alban, Lester Kwiatkowski, Laurent Bopp, et al. "The representation of alkalinity and the carbonate pump from CMIP5 to CMIP6 Earth system models and implications for the carbon cycle." Biogeosciences 20, no. 7 (2023): 1195–257. http://dx.doi.org/10.5194/bg-20-1195-2023.

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Abstract. Ocean alkalinity is critical to the uptake of atmospheric carbon in surface waters and provides buffering capacity towards the associated acidification. However, unlike dissolved inorganic carbon (DIC), alkalinity is not directly impacted by anthropogenic carbon emissions. Within the context of projections of future ocean carbon uptake and potential ecosystem impacts, especially through Coupled Model Intercomparison Projects (CMIPs), the representation of alkalinity and the main driver of its distribution in the ocean interior, the calcium carbonate cycle, have often been overlooked.

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17

Aulia, Tia, Rico Aditia Prahmana, Prihadi Setyo Darmanto, Firman Bagja Juangsa, Raden Dewi Ghita Ghaida Permatasari, and Khoeril Walad. "Estimating the dimensions of integrated calciner and carbonator for calcium looping process in a 7500 TPD capacity of cement plant." Journal of Mechatronics, Electrical Power, and Vehicular Technology 15, no. 2 (2024): 117–25. https://doi.org/10.55981/j.mev.2024.1003.

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The calciner in cement factories plays a crucial role, particularly in the decomposition of calcium carbonate (CaCO3) as primary raw materials into calcium oxide (CaO) and carbon dioxide (CO2), a significant contributor to greenhouse gas (GHG) emissions. Hence, an integrated system has been proposed, combining conventional cement plants with calcium looping (CaL) cycles to reduce CO2 emissions. CaL facilitates the capture of CO2 by CaO, forming CaCO3 as raw material for cement production. Given that CaL effectively reduces CO2 emissions, the integration process with conventional cement plants

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18

Huang, Yanni, Fengyin Liu, and Xiangtong Zhang. "A One-Phase Injection Method with Dual Inhibition for Improving the Strength and Uniformity of MICP." Materials 18, no. 11 (2025): 2514. https://doi.org/10.3390/ma18112514.

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The formation and spatial uniformity of calcium carbonate (CaCO3) are critical for evaluating the effectiveness of microbial-induced calcium carbonate precipitation (MICP) in geotechnical applications. In recent years, the single-phase injection method has emerged as a promising alternative to traditional two-phase processes by addressing the issue of uneven CaCO3 distribution. This study proposes a dual inhibition strategy that delays the mineralization reaction by synergistically lowering pH and temperature, thereby promoting uniform precipitation and enhanced compressive strength in cemente

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19

Bach, L. T. "Reconsidering the role of carbonate ion concentration in calcification by marine organisms." Biogeosciences 12, no. 16 (2015): 4939–51. http://dx.doi.org/10.5194/bg-12-4939-2015.

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Abstract. Marine organisms precipitate 0.5–2.0 Gt of carbon as calcium carbonate (CaCO3) every year with a profound impact on global biogeochemical element cycles. Biotic calcification relies on calcium ions (Ca2+) and usually on bicarbonate ions (HCO3−) as CaCO3 substrates and can be inhibited by high proton (H+) concentrations. The seawater concentration of carbonate ions (CO32−) and the CO32−-dependent CaCO3 saturation state (ΩCaCO3) seem to be irrelevant in this production process. Nevertheless, calcification rates and the success of calcifying organisms in the oceans often correlate surpr

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20

Bach, L. T. "Reconsidering the role of carbonate ion concentration in calcification by marine organisms." Biogeosciences Discussions 12, no. 9 (2015): 6689–722. http://dx.doi.org/10.5194/bgd-12-6689-2015.

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Abstract. Marine organisms precipitate 0.5–2.0 Gt of carbon as calcium carbonate (CaCO3) every year with a profound impact on global biogeochemical element cycles. Biotic calcification relies on calcium ions (Ca2+) and generally on bicarbonate ions (HCO3−) as CaCO3 substrates and can be inhibited by high proton (H+) concentrations. The seawater concentration of carbonate ions (CO32−) and the CO32−-dependent CaCO3 saturation state (ΩCaCO3) seem to be irrelevant in this production process. Nevertheless, calcification rates and the success of calcifying organisms in the oceans often correlate sur

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21

Ridgwell, A., J. C. Hargreaves, N. R. Edwards, et al. "Marine geochemical data assimilation in an efficient Earth System Model of global biogeochemical cycling." Biogeosciences 4, no. 1 (2007): 87–104. http://dx.doi.org/10.5194/bg-4-87-2007.

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Abstract. We have extended the 3-D ocean based "Grid ENabled Integrated Earth system model" (GENIE-1) to help understand the role of ocean biogeochemistry and marine sediments in the long-term (~100 to 100 000 year) regulation of atmospheric CO2, and the importance of feedbacks between CO2 and climate. Here we describe the ocean carbon cycle, which in its first incarnation is based around a simple single nutrient (phosphate) control on biological productivity. The addition of calcium carbonate preservation in deep-sea sediments and its role in regulating atmospheric CO2 is presented elsewhere

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22

Batukaev, Abdul-Malik A., Anatoly P. Endovitsky, Andrey G. Andreev, et al. "Ion association in water solution of soil and vadose zone of chestnut saline solonetz as a driver of terrestrial carbon sink." Solid Earth 7, no. 2 (2016): 415–23. http://dx.doi.org/10.5194/se-7-415-2016.

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Abstract. The assessment of soil and vadose zone as the drains for carbon sink and proper modeling of the effects and extremes of biogeochemical cycles in the terrestrial biosphere are the key components to understanding the carbon cycle, global climate system, and aquatic and terrestrial system uncertainties. Calcium carbonate equilibrium causes saturation of solution with CaCO3, and it determines its material composition, migration and accumulation of salts. In a solution electrically neutral ion pairs are formed: CaCO30, CaSO40, MgCO30, and MgSO40, as well as charged ion pairs CaHCO3+, MgHC

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23

van Lier, J. B., and M. A. Boncz. "Controlling calcium precipitation in an integrated anaerobic–aerobic treatment system of a “zero-discharge” paper mill." Water Science and Technology 45, no. 10 (2002): 341–47. http://dx.doi.org/10.2166/wst.2002.0367.

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The pulp and paper industry uses significant amounts of water and energy for the paper production process. Closing the water cycles in this industry, therefore, promises large benefits for the environment and has the potential of huge cost savings for the industry. Closing the water cycle on the other hand also introduces problems with process water quality, quality of the end-product and scaling, owing to increased water contamination. An inline treatment system is discussed in which anaerobic-aerobic bio-reactors perform a central role for removing both organic and inorganic pollutants from

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24

Xu, Hengchao, Xiaotong Peng, Shijie Bai, et al. "Precipitation of calcium carbonate mineral induced by viral lysis of cyanobacteria: evidence from laboratory experiments." Biogeosciences 16, no. 4 (2019): 949–60. http://dx.doi.org/10.5194/bg-16-949-2019.

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Abstract. Viruses have been acknowledged as being important components of the marine system for the past 2 decades, but their role in the functioning of the geochemical cycle has not been thoroughly elucidated to date. Virus-induced rupturing of cyanobacteria is theoretically capable of releasing intracellular bicarbonate and inducing the homogeneous nucleation of calcium carbonate; however, experiment-based support for virus-induced calcification is lacking. In this laboratory study, both water carbonate chemistry and precipitates were monitored during the viral infection and lysis of host ce

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25

Deng, Xi, Zhongming Yang, Kim Wei Chan, Norsharina Ismail, and Md Zuki Abu Bakar. "5-Fluorouracil in Combination with Calcium Carbonate Nanoparticles Loaded with Antioxidant Thymoquinone against Colon Cancer: Synergistically Therapeutic Potential and Underlying Molecular Mechanism." Antioxidants 13, no. 9 (2024): 1030. http://dx.doi.org/10.3390/antiox13091030.

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Colon cancer is the third most common cancer worldwide, with high mortality. Adverse side effects and chemoresistance of the first-line chemotherapy 5-fluorouracil (5-FU) have promoted the widespread use of combination therapies. Thymoquinone (TQ) is a natural compound with potent antioxidant activity. Loading antioxidants into nano delivery systems has been a major advance in enhancing their bioavailability to improve clinical application. Hence, this study aimed to prepare the optimal TQ-loaded calcium carbonate nanoparticles (TQ-CaCO3 NPs) and investigate their therapeutic potential and und

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26

Wu, Baizhi, Haibin Wang, Chunlei Li, Yuan Gong, and Yi Wang. "Progress in the Preparation of Calcium Carbonate by Indirect Mineralization of Industrial By-Product Gypsum." Sustainability 15, no. 12 (2023): 9629. http://dx.doi.org/10.3390/su15129629.

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To avoid the long-term pollution of land and water by industrial gypsum by-products, the exploitation of this resource has become a priority. The indirect synthesis of calcium carbonate from the industrial by-product gypsum has received substantial attention as a viable method for resource utilization. Currently, the primary problems in the indirect manufacture of calcium carbonate from the industrial by-product gypsum are additive recycling and process simplification. This paper describes the present state of development and compares various indirect mineralization systems. The factors affect

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27

Pinsonneault, A. J., H. D. Matthews, E. D. Galbraith, and A. Schmittner. "Calcium carbonate production response to future ocean warming and acidification." Biogeosciences 9, no. 6 (2012): 2351–64. http://dx.doi.org/10.5194/bg-9-2351-2012.

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Abstract. Anthropogenic carbon dioxide (CO2) emissions are acidifying the ocean, affecting calcification rates in pelagic organisms, and thereby modifying the oceanic carbon and alkalinity cycles. However, the responses of pelagic calcifying organisms to acidification vary widely between species, contributing uncertainty to predictions of atmospheric CO2 and the resulting climate change. At the same time, ocean warming caused by rising CO2 is expected to drive increased growth rates of all pelagic organisms, including calcifiers. It thus remains unclear whether anthropogenic CO2 emissions will

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28

Luo, Xiaoyan, Yingqi Feng, Chunjun Li, and Weiping Liu. "Application of Microbial-Induced Carbonate Precipitation for Disintegration Control of Granite Residual Soil." Applied Sciences 14, no. 14 (2024): 6343. http://dx.doi.org/10.3390/app14146343.

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Granite residual soil is widely distributed in Southeastern China. Such soils exhibit mechanical characteristics such as loose, rich cracks and easy disintegration, resulting in severe soil erosion disasters under rainfall conditions. Microbial-induced carbonate precipitation (MICP) is a green alternative for soil stabilization. In this study, a new strategy for the disintegration control of granite residual soil using MICP technology is proposed. The effects of the bacterial solution concentration, the cementation solution concentration, and the treatment cycle are investigated through a disi

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Bates, N. R., M. I. Orchowska, R. Garley, and J. T. Mathis. "Summertime calcium carbonate undersaturation in shelf waters of the western Arctic Ocean – how biological processes exacerbate the impact of ocean acidification." Biogeosciences 10, no. 8 (2013): 5281–309. http://dx.doi.org/10.5194/bg-10-5281-2013.

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Abstract. The Arctic Ocean accounts for only 4% of the global ocean area, but it contributes significantly to the global carbon cycle. Recent observations of seawater CO2-carbonate chemistry in shelf waters of the western Arctic Ocean, primarily in the Chukchi Sea, from 2009 to 2011 indicate that bottom waters are seasonally undersaturated with respect to calcium carbonate (CaCO3) minerals, particularly aragonite. Nearly 40% of sampled bottom waters on the shelf have saturation states less than one for aragonite (i.e., Ωaragonite < 1.0), thereby exposing the benthos to potentially corrosive

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30

Kanzaki, Yoshiki, Dominik Hülse, Sandra Kirtland Turner, and Andy Ridgwell. "A model for marine sedimentary carbonate diagenesis and paleoclimate proxy signal tracking: IMP v1.0." Geoscientific Model Development 14, no. 10 (2021): 5999–6023. http://dx.doi.org/10.5194/gmd-14-5999-2021.

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Abstract. The preservation of calcium carbonate in marine sediments is central to controlling the alkalinity balance of the ocean and, hence, the ocean–atmosphere partitioning of CO2. To successfully address carbon cycle–climate dynamics on geologic (≫1 kyr) timescales, Earth system models then require an appropriate representation of the primary controls on CaCO3 preservation. At the same time, marine sedimentary carbonates represent a major archive of Earth history, as they have the potential to preserve how seawater chemistry, isotopic composition, and even properties of planktic and benthi

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31

Ávila, I., A. Mortari, A. M. Santos, and P. M. Crnkovic. "THE CALCIUM LOOPING CYCLE STUDY FOR CAPTURING CARBON DIOXIDE APPLIED TO THE ENERGY GENERATION." Revista de Engenharia Térmica 12, no. 2 (2013): 28. http://dx.doi.org/10.5380/reterm.v12i2.62041.

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The calcium looping process (Ca-L) is a promising technology to reduce of the carbon dioxide (CO2) emissions when applied in energy generation systems. Ca-based materials (usually limestone) are used in this process as CO2 sorbents. Thus, the CO2 capture occurs by the reversible reaction between calcium oxide (CaO) and CO2, resulting in the calcium carbonate form (CaCO3). Compared to other technologies applied to carbon sequestration process, the Ca-L offers additional advantages such: the use of fluidized bed technology that is already well established; this process occurs at high temperature

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32

Lerman, A., and F. T. Mackenzie. "CO<sub>2</sub> air-sea exchange due to calcium carbonate and organic matter storage: pre-industrial and Last Glacial Maximum estimates." Biogeosciences Discussions 1, no. 1 (2004): 429–95. http://dx.doi.org/10.5194/bgd-1-429-2004.

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Abstract. Release of CO2 from surface ocean water owing to precipitation of CaCO3 and the imbalance between biological production of organic matter and its respiration, and their net removal from surface water to sedimentary storage was studied by means of a model that gives the quotient θ=(CO2 released to the atmosphere)/(CaCO3 precipitated). The surface ocean layer is approximated by a euphotic zone, 50 m thick, that includes the shallower coastal area and open ocean. θ depends on water temperature, CaCO3 and organic carbon mass formed, and atmospheric CO2 concentration. At temperatures betw

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33

Ibiyeye, Kehinde Muibat, and Abu Bakar Zakaria Zuki. "Cockle Shell-Derived Aragonite CaCO3 Nanoparticles for Co-Delivery of Doxorubicin and Thymoquinone Eliminates Cancer Stem Cells." International Journal of Molecular Sciences 21, no. 5 (2020): 1900. http://dx.doi.org/10.3390/ijms21051900.

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Cancer stem cells CSCs (tumour-initiating cells) are responsible for cancer metastasis and recurrence associated with resistance to conventional chemotherapy. This study generated MBA MD231 3D cancer stem cells enriched spheroids in serum-free conditions and evaluated the influence of combined doxorubicin/thymoquinone-loaded cockle-shell-derived aragonite calcium carbonate nanoparticles. Single loaded drugs and free drugs were also evaluated. WST assay, sphere forming assay, ALDH activity analysis, Surface marker of CD44 and CD24 expression, apoptosis with Annexin V-PI kit, cell cycle analysis

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Bates, N. R., M. I. Orchowska, R. Garley, and J. T. Mathis. "Seasonal calcium carbonate undersaturation in shelf waters of the Western Arctic Ocean; how biological processes exacerbate the impact of ocean acidification." Biogeosciences Discussions 9, no. 10 (2012): 14255–90. http://dx.doi.org/10.5194/bgd-9-14255-2012.

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Abstract. The Arctic Ocean accounts for only 4% of the global ocean area but it contributes significantly to the global carbon cycle. Recent observations of seawater carbonate chemistry in shelf waters of the Western Arctic from 2009 to 2011 indicate that extensive areas of the benthos are exposed to bottom waters that are seasonally undersaturated with respect to calcium carbonate (CaCO3) minerals, particularly aragonite. Our observations indicate seasonal reduction of saturation states (Ω) for calcite (Ωcalcite) and aragonite (Ωaragonite) in the subsurface in the Western Arctic by as much as

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Khussain, Bolatbek, Alexandr Sass, Alexandr Brodskiy, et al. "Dry Carbonate Sorbents for CO2 Capture from Flue Gases: Role of Support in Adsorption Efficiency and Thermal Stability." Molecules 30, no. 13 (2025): 2859. https://doi.org/10.3390/molecules30132859.

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This study presents the results of an investigation of carbonate-containing sorbents for CO2 capture with natural support materials—kaolin and calcium carbonate—at various loadings of the active phase of Na2CO3. The effects of the support type on the distribution of the active component, phase composition, and pore structure of the sorbents were studied. It was found that a Na2CO3 loading of 25 wt.% provides the best balance between sorption capacity and technological feasibility. The thermal stability and regeneration capacity of the sorbents were evaluated under high-temperature conditions,

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Sugiura, Yuki, Kunio Ishikawa, Kazuo Onuma, and Yoji Makita. "PO4 adsorption on the calcite surface modulates calcite formation and crystal size." American Mineralogist 104, no. 10 (2019): 1381–88. http://dx.doi.org/10.2138/am-2019-7015.

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Abstract Calcium carbonate (CaCO3) and particularly its stable phase, calcite, is of great geological significance in the deep carbon cycle since CaCO3 from biomineralized shells and corals form sedimentary rocks. Calcite also attracts attention in medical science and pharmacy as a primary or intermediate component in biomaterials because it possesses excellent biocompatibility along with suitable physicochemical properties. Calcite blocks have already been used during surgical procedures as a bone substitute for reconstructing bone defects formed by diseases and injury. When producing CaCO3 b

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Ridgwell, A., J. C. Hargreaves, N. R. Edwards, et al. "Marine geochemical data assimilation in an efficient Earth System Model of global biogeochemical cycling." Biogeosciences Discussions 3, no. 4 (2006): 1313–54. http://dx.doi.org/10.5194/bgd-3-1313-2006.

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Abstract. We have extended the 3-D ocean based "Grid ENabled Integrated Earth system model'' (GENIE-1) to help understand the role of ocean biogeochemistry and marine sediments in the "long-term'' (~100 to 100 000 year) regulation of atmospheric CO2, and the importance of feedbacks between CO2 and climate. Here we describe the ocean carbon cycle, which is based around a simple single nutrient (phosphate) control on biological productivity. The addition of ocean-sediment interactions is presented elsewhere (Ridgwell and Hargreaves, 2006). We have calibrated the model parameters controlling ocea

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SCHWANTES-CEZARIO, N., M. F. PORTO, G. F. B. SANDOVAL, G. F. N. NOGUEIRA, A. F. COUTO, and B. M. TORALLES. "Effects of Bacillus subtilis biocementation on the mechanical properties of mortars." Revista IBRACON de Estruturas e Materiais 12, no. 1 (2019): 31–38. http://dx.doi.org/10.1590/s1983-41952019000100005.

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Abstract This study aims to evaluate the influence of B. subtilis AP91 spores addition on the mechanical properties of mortars. B. subtilis strain AP91, isolated from rice leaves of the needle variety, which has an early cycle of production, was used at the concentration of 105 spores/mL in mortars with cement-to-sand ratio of 1:3 (by weight) and water-to-cement ratio (w/c) of 0.63. These spores were added in two different ways: in the mixing water and by immersion in a solution containing bacterial spores. Scanning Electron Microscope (SEM) analysis showed crystals with calcium peaks on the E

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Wang, Jie, Sijia Sun, Lei Pan, Zhuoqun Xu, Hao Ding, and Wei Li. "Preparation and Properties of CaCO3-Supported Nano-TiO2 Composite with Improved Photocatalytic Performance." Materials 12, no. 20 (2019): 3369. http://dx.doi.org/10.3390/ma12203369.

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In order to improve the photocatalytic degradation efficiency of nano-TiO2, reduce its usage and realize recycling and reuse, CaCO3–TiO2 composite photocatalyst was prepared with calcium carbonate (CaCO3) and TiO2 in a grinding machine through the integration of grinding depolymerization, dispersion and particle composition. The photocatalytic degradation performance, recycling performance, structure and morphology of CaCO3–TiO2 were studied. The interaction mechanism between CaCO3 and TiO2 and the improvement mechanism for the photocatalytic performance of TiO2 were also discussed. The result

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Ziegler, Andreas. "Immunocytochemical Localization of Na+,K+-ATPase in the Calcium-transporting Sternal Epithelium of the Terrestrial Isopod Porcellio scaber L. (Crustacea)." Journal of Histochemistry & Cytochemistry 45, no. 3 (1997): 437–46. http://dx.doi.org/10.1177/002215549704500311.

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Terrestrial isopods store large amounts of calcium carbonate between the epithelium and the old cuticle of the first four anterior sternites before molt. During the formation of these sternal CaCO3 deposits, large amounts of calcium are transported across the anterior sternal epithelium from the base to the apical side of the integument, and in the reverse direction during resorption of the deposit. A monoclonal antibody against the avian α-subunit of Na+,K+-ATPase was used to localize Na+,K+-ATPase in the anterior and the posterior sternal epithelium of Porcellio scaber. Semithin cryosections

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Kim, Yumi, and Yul Roh. "Microbial Precipitation of Calcium Carbonate for Crack Healing and Stabilization of Sandy Soils." Applied Sciences 14, no. 4 (2024): 1568. http://dx.doi.org/10.3390/app14041568.

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Microbially induced calcium carbonate (CaCO3) precipitation (MICP) can improve the shear strength of soil via biocementation while reducing its porosity and hydraulic conductivity. The purpose of this study was to evaluate the effect of the addition of bacterial metabolites and montmorillonite on the crack healing and biocementation of sandy soil during the MICP process. Cracks were generated by drying wet soil samples in Petri dishes, after which they were sprayed with one of four treatments: deionized water, a cementation solution, bacteria mixed with the cementation solution, and bacterial

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Mamaeva, Axaule, Aidar Kenzhegulov, Aleksander Panichkin, et al. "Influence of Current Duty Cycle and Voltage of Micro-Arc Oxidation on the Microstructure and Composition of Calcium Phosphate Coating." Coatings 14, no. 6 (2024): 766. http://dx.doi.org/10.3390/coatings14060766.

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The micro-arc oxidation (MAO) technique was employed to produce calcium phosphate coatings on titanium surfaces using an electrolyte composed of hydroxyapatite and calcium carbonate in an aqueous solution of orthophosphoric acid. The coatings’ morphology and composition were regulated by adjusting electrical parameters, specifically the duty cycle and voltage. This study examined the effects of the duty cycle and voltage during the MAO process on the microstructure and composition of calcium phosphate coatings on VT1–0 titanium substrates. Scanning electron microscopy (SEM) was utilized to ana

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Xiao, Peng, Hanlong Liu, Armin W. Stuedlein, T. Matthew Evans, and Yang Xiao. "Effect of relative density and biocementation on cyclic response of calcareous sand." Canadian Geotechnical Journal 56, no. 12 (2019): 1849–62. http://dx.doi.org/10.1139/cgj-2018-0573.

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Microbial-induced calcium carbonate precipitation (MICP) represents a promising approach to improve the geotechnical engineering properties of soils through the precipitation of calcium carbonate (CaCO3) at soil particle contacts and soil particle surfaces. An extensive experimental study was undertaken to investigate the influence of initial relative density on the efficiency of the biocementation process, the reduction of liquefaction susceptibility, and the cyclic response in biocemented calcareous soils. For this purpose, stress-controlled undrained cyclic triaxial shear (CTS) tests were c

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Gonçalves, Alex Augusto, and Marcelo Gonzalez Passos. "Restructured fish product from white croacker (Micropogonias furnieri) mince using microbial transglutaminas." Brazilian Archives of Biology and Technology 53, no. 4 (2010): 987–95. http://dx.doi.org/10.1590/s1516-89132010000400030.

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This study aimed at determining the influence of three concentrations of commercial transglutaminase enzyme in restructured fillet of minced fish from white croacker (Micropogonias furnieri), one of the four marine species with notability in Brazil. The restructured fillet developed had advantages when compared to traditional fillet, such as absence of spine and less flavour intensity (washes cycles). Washing process for white croacker mince was compared with five clarification agents: water (control), phosphoric acid (H3PO4), sodium chloride (NaCl), calcium carbonate (CaCO3) and sodium bicarb

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Gralik, Guilherme, Alessandra Thomsen, Cristian Moraes, Fabiano Raupp-Pereira, and Dachamir Hotza. "Processing and characterization of CaTiO3 perovskite ceramics." Processing and Application of Ceramics 8, no. 2 (2014): 53–57. http://dx.doi.org/10.2298/pac1402053g.

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Calcium titanate (CaTiO3) ceramics with perovskite structure were produced by solid state reaction. Calcium carbonate (CaCO3) and titanium dioxide (TiO2) were mixed (in molar ratios 1/1 and 3/2), and the obtained mixtures were calcined at 1150 ?C in successive thermal cycles. The obtained samples were characterized by differential thermal analysis, thermogravimetry, X-ray diffraction, measurement of particle size distribution and linear thermal shrinkage. XRD results indicated that the samples have perovskite CaTiO3 structure with small amount of secondary CaO and TiO2 phases, and their phase

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Shutler, J. D., P. E. Land, C. W. Brown, et al. "Coccolithophore surface distributions in the North Atlantic and their modulation of the air-sea flux of CO<sub>2</sub> from 10 years of satellite Earth observation data." Biogeosciences 10, no. 4 (2013): 2699–709. http://dx.doi.org/10.5194/bg-10-2699-2013.

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Abstract. Coccolithophores are the primary oceanic phytoplankton responsible for the production of calcium carbonate (CaCO3). These climatically important plankton play a key role in the oceanic carbon cycle as a major contributor of carbon to the open ocean carbonate pump (~50%) and their calcification can affect the atmosphere-to-ocean (air-sea) uptake of carbon dioxide (CO2) through increasing the seawater partial pressure of CO2 (pCO2). Here we document variations in the areal extent of surface blooms of the globally important coccolithophore, Emiliania huxleyi, in the North Atlantic over

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Li, Xiaomin, Kemeng Luo, Jinqian Ren, Xiangrui Wang, Qian Mu, and Wenhong Fan. "Characterisation of extracellular polymeric substances from different cyanobacterial species and their influence on biocalcification processes." Environmental Chemistry 14, no. 4 (2017): 254. http://dx.doi.org/10.1071/en17068.

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Environmental contextExtracellular polymeric substances provide a nucleation site for calcium carbonate and hence are important for bio-calcification processes, with implications for sediment formation and the global carbon cycle. We investigate the calcification potential of polymeric substances produced by five species of cyanobacteria. The results indicate that the protein content and alkaline functional groups of the extracellular polymeric substances may have a significant effect on cyanobacterial calcification. AbstractCyanobacterial calcification plays a crucial role in the formation of

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Shutler, J. D., P. E. Land, C. W. Brown, et al. "Coccolithophore surface distributions in the North Atlantic and their modulation of the air-sea flux of CO<sub>2</sub> from 10 years of satellite Earth observation data." Biogeosciences Discussions 9, no. 5 (2012): 5823–48. http://dx.doi.org/10.5194/bgd-9-5823-2012.

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Abstract. Coccolithophores are the primary oceanic phytoplankton responsible for the production of calcium carbonate (CaCO3). These climatically important plankton play a key role in the oceanic carbon cycle as a major contributor of carbon to the open ocean carbonate pump (~50%) and their formation can affect the atmosphere-to-ocean (air-sea) uptake of carbon dioxide (CO2) through increasing the seawater partial pressure of CO2 (pCO2). Here we document variations in the areal extent of surface blooms of the globally important coccolithophore, Emiliania huxleyi, in the North Atlantic over a 10

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Zhu, Jin, Renjie Wei, Di Dai, et al. "Enhancing microbial-induced calcium carbonate precipitation efficiency in calcareous sands through ferric ion additives: A comprehensive experimental investigation." PLOS One 20, no. 7 (2025): e0327568. https://doi.org/10.1371/journal.pone.0327568.

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In recent years, the reinforcement of calcareous sands using the microbially induced calcium carbonate precipitation (MICP) method has emerged as a prominent research area. Nevertheless, a significant drawback of the MICP method is that multiple treatments with the cementing solution are required to achieve the desired improvement effect. To address this limitation, this study proposes an optimized MICP strategy through adding the ferric ion into cementing solutions. The effectiveness of the proposed method was investigated by analyzing the precipitation of CaCO3, unconfined compressive streng

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Mo, Yixin, Songlin Yue, Qizhen Zhou, and Xiao Liu. "Improvement and Soil Consistency of Sand–Clay Mixtures Treated with Enzymatic-Induced Carbonate Precipitation." Materials 14, no. 18 (2021): 5140. http://dx.doi.org/10.3390/ma14185140.

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Recently, microbially induced carbonate precipitation (MICP) has been studied as an alternative for the improvement of sand–clay mixtures. However, the cementing uniformity of MICP-treated sand–clay mixtures cannot be guaranteed. In this present study, enzymatic-induced carbonate precipitation (EICP) was used to deal with it. The ions used in kaolin clay was predicted to affect the production rate for calcium carbonate (CaCO3), which was studied using the calcification test. The solidification test was conducted using two different methods (the premixing method and the diffusion method). The p

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