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| Registros recuperados: 15 | |
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| Fry, Claudia H.; Tyrrell, Toby; Hain, Mathis P.; Bates, Nicholas R.; Achterberg, Eric P.. |
| The export of calcium carbonate (CaCO3) from the surface ocean is poorly constrained. A better understanding of the magnitude and spatial distribution of this flux would improve our knowledge of the ocean carbon cycle and marine biogeochemistry. Here, we investigate controls over the spatial distribution of total alkalinity in the surface global ocean and produce a tracer for CaCO3 cycling. We took surface ocean bottle data for total alkalinity from global databases (GLODAP, CARINA, PACIFICA) and subtracted the effects of several processes: evaporation and precipitation, river discharge, and nutrient uptake and remineralization. The remaining variation in alkalinity exhibits a robust and coherent pattern including features of large amplitude and spatial... |
| Tipo: Text |
Palavras-chave: Alkalinity; Calcium carbonate; Biogeochemical cycles; Tracers. |
| Ano: 2015 |
URL: https://archimer.ifremer.fr/doc/00292/40367/83011.pdf |
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| Chang, Yp; Wu, Sm; Wei, Ky; Murayama, M; Kawahata, H; Chen, Mt. |
| Biogenic carbonate and organic carbon content of two deep sea cores (MD012404 and ODP site 1202) are measured to reconstruct surface ocean productivity variations in areas of the Okinawa Trough in the Western Pacific where the modern climate is highly sensitive to the East Asian monsoon and precipitation/river runoff. Based on foraminiferal isotope stratigraphy and AMS C-14 dating, the age models of the cores indicate that core MD012404 shows relatively low sedimentation rates with 50 cm ky(-1) on average, and that the sedimentation rates in core ODP 1202 are extremely high with an average of 500 cm ky(-1). Total organic carbon (TOC) and carbonate contents in core ODP 1202 are 0.56% and 6.80% on average, respectively, and are 0.62% and 15.86%,... |
| Tipo: Text |
Palavras-chave: IMAGES; ODP; Total organic carbon; Calcium carbonate; Okinawa Trough; Paleoceanography; Climate change; East Asian monsoon. |
| Ano: 2005 |
URL: https://archimer.ifremer.fr/doc/00229/34064/32627.pdf |
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| Buassi,N.. |
| This study evaluates the influence of different concentrations of calcium on blood pressure of normotensive rats. Four groups of Wistar rats (A, B, C and D) had free access to modified isocaloric and isoproteic diets containing 0.2, 0.5, 2 and 4 g% calcium as calcium carbonate for a period of 30 days. Systolic and diastolic arterial blood pressures were monitored in awake rats by the indirect tail cuff method using a Physiograph equipped with transducers and preamplifiers. Body weight and length and food intake were monitored. Under the conditions of the present experiment, the systolic and diastolic arterial blood pressures of group D rats fed a diet containing 4 g% calcium were significantly (P<0.05) lower compared to rats of the other groups. |
| Tipo: Info:eu-repo/semantics/other |
Palavras-chave: Calcium carbonate; Arterial blood pressure; Dietary calcium. |
| Ano: 1998 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1998000800011 |
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| Trinkler, Nolwenn; Bardeau, Jean-francois; Marin, Frederic; Labonne, Maylis; Jolivet, Aurelie; Crassous, Philippe; Paillard, Christine. |
| The mineral phase of shell repair in the Manila clam Venerupis philippinarum affected by brown ring disease (BRD) was characterised at various scales and at various stages of shell repair by confocal Raman microspectrometry and scanning electron microscopy. Spherulitic and quadrangular aragonite microstructures associated with polyene pigments were clearly observed. Von Kossa staining showed that at the beginning of shell repair, hemocytes are filled with insoluble calcium carbonate salts in all fluids and then are transported toward the extrapallial fluids and the repair sites. Our analyses suggest that after a Vibrio tapetis attack and BRD deposit some clams rapidly cover the deposit, resulting in a modification in the microstructure, which could be... |
| Tipo: Text |
Palavras-chave: Aragonite; Hemocytes; Shell microstructure; Calcium carbonate; Biomineralization; Mollusc; Raman microspectrometry; Scanning electron microscopy. |
| Ano: 2011 |
URL: http://archimer.ifremer.fr/doc/00029/14065/11301.pdf |
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| Santos,Mateus Castilho; Nussio,Luiz Gustavo; Mourão,Gerson Barreto; Schmidt,Patrick; Mari,Lucas José; Ribeiro,José Leonardo; Queiroz,Oscar Cézar Müller; Zopollatto,Maity; Sousa,Daniel de Paula; Sarturi,Jhones Onorino; Toledo Filho,Sérgio Gil de. |
| The use of ensiled sugarcane has been increased lately in Brazil due to the benefits that this technique represents. The objective of this study was to evaluate the effects of chemical additives on the nutritive value of sugarcane silages. The trial was carried out in a completely randomized experimental design with four replicates per treatment. The following additives were applied onto the fresh forage before ensiling: L. buchneri, lime or limestone, 1.0 and 1.5% (wet basis) each, and gypsum 1.0% (wet basis), all of them diluted into 40 L of water per ton of fresh weight of forage. The analyzed variables were: ash, crude protein, neutral detergent fiber, acid detergent fiber and organic and dry matter digestibility. The addition of lime or limestone... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Calcium carbonate; Calcium oxide; Calcium sulfate. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000200003 |
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| Murakami,Fabio Seigi; Rodrigues,Patrik Oening; Campos,Célia Maria Teixeira de; Silva,Marcos Antônio Segatto. |
| Calcium carbonate, a pharmaceutical excipient, is widely used as diluent in solid dosage forms. It is also used as a base for medicinal and dental preparations, a buffering and dissolution aid for dispersible tablets, a food additive and a calcium supplement. Egg shells are a rich source of mineral salts, mainly calcium carbonate, which corresponds to about 94% of the shell. Layer farms produce large amounts of shells, whose final disposal poses a challenge from the environmental standpoint. This work was designed to evaluate the physicochemical and thermal properties of calcium carbonate obtained from egg shells. The findings indicated that calcium carbonate from egg shells can be used as an alternative pharmaceutical excipient. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Thermal analysis; X-ray powder diffraction; Egg shells; Calcium carbonate. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612007000300035 |
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| Fleury, C; Marin, F; Marie, B; Luquet, G; Thomas, J; Josse, C; Serpentini, A; Lebel, J. |
| In the present paper, juvenile and adult shells of the green ormer Haliotis tuberculata ('Oreille de Saint-Pierre') were perforated in a zone close to the shell edge and the shell repair process was followed at two levels: (1) by observing the histology of the calcifying mantle in the repair zone and (2) by analyzing with SEM the microstructure of the shell repair zone. Histological data clearly show the presence of calcium carbonate granules into the connective tissues, but not in the epithelial cells. This suggests that calcium carbonate granules are synthesized by sub-epithelial cells and actively transported through the epithelium to the repair zone, via a process which may be similar to that described by Mount et al. [Mount, A.S., Wheeler, A.P.,... |
| Tipo: Text |
Palavras-chave: Microstructure; Mantle epithelium; Biomineralization; Calcium carbonate; Shell repair; Gastropod. |
| Ano: 2008 |
URL: https://archimer.ifremer.fr/doc/2008/publication-4377.pdf |
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| Nongnuch Saenghin; Boonmee Siri. |
| In commercial corn production, small seed size is discarded from the seed lot and used as the animal feed, resulting in less profit to the seed industry. Therefore, the objective of this research was to increase seed size by seed pelleting methods. In this study, the types of filler pelleting materials and ratio of binder materials were investigated. The experiment was conducted at Seed Quality Test Laboratory of Seed Processing Plant, Faculty of Agriculture, Khon Kaen University. Small seed size of hybrid corn that retained on grade 14/64” diameter sieve perforations were pelleted with seven different types and ratios of fillers (vermiculite, bentonite, pumice, calcium sulphate, calcium carbonate, charcoal and coconut) with four different types of binders... |
| Tipo: PhysicalObject |
Palavras-chave: Corn seed; Seed pelleting; Vermiculite; Bentonite; Pumice; Calcium sulphate; Calcium carbonate; Charcoal; Coconut; Binde; Hydroxypropyl methylcellulose; HPMC; Gum arabic; Carboxymethyl cellulose; CMC power; Methyl cellulose; Seed size; Seed quality; Seed enhancement; Germination percentage; Seed vigour; เมล็ดพันธุ์ข้าวโพด; การพอกเมล็ดพันธุ์; สารพอก; วัสดุประสาน; เทคโนโลยีเมล็ดพันธุ์; การยกระดับคุณภาพเมล็ดพันธุ์; อัตราการงอกของเมล็ด; ความแข็งแรงของเมล็ด. |
| Ano: 2013 |
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5727 |
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| Registros recuperados: 15 | |
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