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PubMed Journals Articles About "Global Regional Calcium Carbonate From Oyster Shell Market" RSS

20:12 EST 17th January 2019 | BioPortfolio

Global Regional Calcium Carbonate From Oyster Shell Market PubMed articles on BioPortfolio. Our PubMed references draw on over 21 million records from the medical literature. Here you can see the latest Global Regional Calcium Carbonate From Oyster Shell Market articles that have been published worldwide.

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Showing "Global Regional Calcium Carbonate from Oyster Shell Market" PubMed Articles 1–25 of 9,300+

752Structural and functional analyses of calcium ion response factors in the mantle of Pinctada fucata.

The pearl oyster, Pinctada fucata, is cultured for pearl production in Japan. The shell of the pearl oyster consists of calcium carbonate and a small amount of organic matrix. Despite many studies of the shell matrix proteins, the mechanism by which calcium elements are transported from the mantle to the shell remains unclear. Investigating the molecular mechanism of calcium transportation, we prepared artificial seawater with a high concentration of calcium ions (10ASW) to induce calcification in the pearl...


Effect of Calcium Citrate versus Calcium Carbonate on elevated PTH after Roux-en-Y gastric bypass. A Double-blinded, Randomized Trial.

Following Roux-en-Y gastric bypass (RYGB), elevated parathyroid hormone (PTH) levels potentially harmful to bone health are commonly observed. Owing to assumed superior absorption, calcium citrate is often recommended over calcium carbonate following RYGB for the treatment of elevated PTH. We aimed to investigate the impact of either calcium carbonate or calcium citrate (1200 mg elementary calcium) in patients with elevated PTH levels following RYGB.

L-thyroxine malabsorption due to calcium carbonate impairs blood pressure, total cholesterolemia, and fasting glycemia.

Calcium carbonate was previously shown to interfere with L-thyroxine absorption. To estimate the magnitude of tablet L-thyroxine malabsorption caused by calcium carbonate, with resulting increase in serum thyrotropin (TSH), we performed a cohort study in a referral care center.


Dual gene repertoires for larval and adult shells reveal molecules essential for molluscan shell formation.

Molluscan shells, mainly composed of calcium carbonate, also contain organic components such as proteins and polysaccharides. Shell organic matrices construct frameworks of shell structures and regulate crystallization processes during shell formation. To date, a number of shell matrix proteins (SMPs) have been identified, and their functions in shell formation have been studied. However, previous studies focused only on SMPs extracted from adult shells, secreted after metamorphosis.Using proteomic analyses...

Pregnancy supplementation of Gambian mothers with calcium carbonate alters mid-childhood IGF1 in a sex-specific manner.

Sex-specific effects of pregnancy calcium carbonate supplementation have been reported in 8-12 year old Gambian children, indicating faster growth in boys but slower growth in girls born to calcium-supplemented mothers.

Influence of Calcium Carbonate and Biochar Addition on Soil Nitrogen Retention in Acidified Vegetable Soil.

In Taihu Lake region, more and more paddy fields are being converted to vegetable fields, which cause serious soil acidification and decreased soil nitrogen retention. In this study, calcium carbonate and biochar were used as acidification amendments to test their ability on soil acidification remediation and soil nitrogen retention improvement. Calcium carbonate and biochar addition rates were determined by pH buffering curves. An incubation experiment with and without nitrogen fertilization and multi-leac...

Effect of a lipopeptide biosurfactant on the precipitation of calcium carbonate.

Observing flora and fauna, it can be said that nature is a great architect. Nature can create amazing structures with unique properties that may find potential applications in industry. This phenomenon is why the biomimetic synthesis of calcium carbonate with various polymorphs, sizes and morphologies using natural biomolecules, such as proteins and polysaccharides, has become an interesting topic in recent years. This novel work uses natural surfactants produced by Bacillus species (surfactins) in the form...

Softening of drinking water by the pellet reactor - Effects of influent water composition on calcium carbonate pellet characteristics.

Pellet softening of drinking water can provide aesthetic, socioeconomic and environmental benefits in areas with hard water. Calcium carbonate pellets are the main by-product from pellet softening and their characteristics determine their reuse potentials. We characterized pellets from a pilot-scale pellet reactor treating 16 water types at 8 Danish drinking water treatment plants to investigate the variations in pellet characteristics and how they depend on the influent water composition. The pellets consi...

Optimized Calcium Supplementation Approach for Regional Citrate Anticoagulation.

It has been confirmed that regional citrate anticoagulation (RCA) plays an effective role in extracorporeal anticoagulation. The current trial-and-error calcium supplementation approach, with intensive monitoring of calcium levels, restricts the widespread use of RCA. Therefore, this study aimed to optimize the calcium supplementation approach for RCA.

Sorbitol Minimizes Calcium Carbonate Scale Generation While Maintaining the Disinfection Effect of Heated Scallop-Shell Powder for Fresh Produce.

Scallop shells subjected to heat treatment exhibit antimicrobial activity, and heated scallop-shell powder (HSSP) has recently been reported to be effective for disinfecting food. However, because the main component of these shells is calcium oxide, there is a problem that scales of calcium carbonate (CaCO) become established on the surface of equipment used for food processing. In this study, we thus investigated whether the addition of sugar to HSSP slurry suppressed CaCO scale generation and whether the ...

Conformational polymorphic changes in the crystal structure of the chiral antiparasitic drug praziquantel and interactions with calcium carbonate.

Praziquantel is an antiparasitic drug used for decades. Currently, the praziquantel commercial preparation is a racemic mixture, in which only the levo-enantiomer possesses anthelmintic activity. The knowledge of its properties in the solid state and other chemical-physical properties is necessary for improving its efficacy and applications. Drug solid dispersions were prepared with calcium carbonate at 1:5 drug to excipient weight ratio by solvent evaporation method. Then, the modification of the crystal s...

A novel nacre matrix protein hic24 in Hyriopsis cumingii is essential for calcium carbonate nucleation and involved in pearl formation.

Matrix proteins play important roles in molluscan shell biomineralization, which helps in the understanding of mechanisms associated with pearl formation. In this study, we characterized the gene encoding a novel shell-matrix protein, hic24, in Hyriopsis cumingii and investigated its structure and function. The full cDNA sequence of hic24 is 756 bp, with an open reading frame of 654 bp encoding 217 amino acids, including a signal peptide of 18 amino acids. Sequence analysis revealed that the protein is ∼2...

Microencapsulated paraffin phase change material with calcium carbonate shell for thermal energy storage and solar-thermal conversion.

A series of microencapsulated phase change materials (MEPCMs) based on paraffin core and calcium carbonate (CaCO3) shell were synthesized, and effect of emulsifier type and pH value on morphology, structure and properties of paraffin@CaCO3 MEPCMs were investigated. The results showed that CaCO3 shell was formed in vaterite and calcite crystalline phase when emulsifier was sodium dodecyl benzene sulfonate (SDBS) and styrene-maleic anhydride (SMA), respectively. When sodium dodecyl sulfate (SDS) was used as e...

Analysis of global stock index data during crisis period via complex network approach.

Considerable research has been done on the complex stock market, however, there is very little systematic work on the impact of crisis on global stock markets. For filling in these gaps, we propose a complex network method, which analyzes the effects of the 2008 global financial crisis on global main stock index from 2005 to 2010. Firstly, we construct three weighted networks. The physics-derived technique of minimum spanning tree is utilized to investigate the networks of three stages. Regional clustering ...

Biomineralisation performance of bacteria isolated from a landfill in China.

We report an investigation of microbially-induced carbonate precipitation by seven indigenous bacteria isolated from a landfill in China. Bacterial strains were cultured in a medium supplemented with 25 mM calcium chloride and 333 mM urea. The experiments were carried out at 30 °C for 7 days with agitation by a shaking table at 130 rpm. Scanning Electron Microscopic (SEM) and X-ray diffraction (XRD) analyses showed variations in calcium carbonate polymorphs and mineral composition induced by all bacterial ...

Ex vivo detection of calcium phosphate and calcium carbonate in rat blood serum.

The total calcium (tCa) in blood serum comprises free Ca ions (fCa), protein-bound calcium (prCa), and complexed calcium by small anions (cCa). The cCa fraction, in addition to fCa, has been indicated to have some physiological activity. However, there is little evidence for the structure of its constituents. Here we report an ex vivo detection of the cCa constituents by synchrotron X-ray absorption near-edge structure spectroscopy. We collected the data directly on rat blood serum and, by making use of the...

Pretreating anaerobic fermentation liquid with calcium addition to improve short chain fatty acids extraction via in situ synthesis of layered double hydroxides.

In situ synthesis of layered double hydroxides (LDHs) was proved to be an effective way to extract short chain fatty acids (SCFAs) from anaerobic fermentation liquid (AFL) as carbon source for biodenitrification, but the SCFAs content in SCFAs-LDH was unsatisfactory because of the existence of much carbonate in AFL. Pretreatment of AFL with calcium addition was investigated to remove carbonate and improve SCFAs extraction via LDHs synthesis. Results of batch tests showed that, the carbonate removal efficien...

Morphological and crystal chemical characteristic of panсreatic lithiasis.

Introduction: Information on chemical and phase composition of pancreoliths is limited and discrepant. There are reports, that pancreoliths are composed by calcium, phosphate, calcium carbonate or combination of calcium with fatty acids The aim of the work is studying of structural characteristics of pancreatoliths in 5 clinical cases.

Similar controls on calcification under ocean acidification across unrelated coral reef taxa.

Ocean acidification (OA) is a major threat to marine ecosystems, particularly coral reefs which are heavily reliant on calcareous species. OA decreases seawater pH and calcium carbonate saturation state (Ω), and increases the concentration of dissolved inorganic carbon (DIC). Intense scientific effort has attempted to determine the mechanisms via which ocean acidification (OA) influences calcification, led by early hypotheses that calcium carbonate saturation state (Ω) is the main driver. We grew corals a...

Comparison of the effects of calcified green macroalga (Halimeda macroloba Decaisne) and commercial CaCO on the properties of composite starch foam trays.

The calcified green macroalga, Halimeda macroloba, is a source of bio-based calcium carbonate which can be used as a filler in starch foam tray. In the first part of this study, the composition and structure of calcium carbonate of this species were investigated using Fourier transform infrared spectrometry (FTIR), X-ray diffraction (XRD), Energy dispersive X-ray spectroscopy (EDX) and Scanning election microscopy (SEM). The morphology of the macroalgal powder particles was rod-like and organic materials (e...

Promotion of graphitic carbon oxidation via stimulating CO desorption by calcium carbonate.

Carbon oxidation has two stages, the first is the formation of surface oxides and the second is the gasification of the surface oxides to CO. Calcium carbonate (CaCO) was used to catalyze the gasification of the surface oxides. The catalytic effect of on graphite oxidation and its catalytic mechanism were studied by using thermogravimetric technique and in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). It was found that characteristic temperature (T) of graphite oxidation with Ca...

Simultaneous removal of nitrogen and phosphorus by magnesium-modified calcium silicate core-shell material in water.

In this study, a new core-shell material (CMCS) is prepared with magnesium oxide (MgO) around calcium silicate hydrate (CSH), and CSH is prepared by SiO from the red mud. The CMCS simultaneously removes ammonia nitrogen (NH) and phosphate (PO) by chemical precipitation and it can achieve recovery of nitrogen and phosphorus. The removal process of NH and PO is as follows. First, the shell of MgO is used to remove NH and a part of the PO by the assisted adsorption and struvite (MgNHPO·6HO) precipitation meth...

Facile preparation of phospholipid-amorphous calcium carbonate hybrid nanoparticles: toward controllable burst drug release and enhanced tumor penetration.

A facile solvent diffusion method was developed to prepare phospholipid-amorphous calcium carbonate (ACC) hybrid nanoparticles via a one-pot approach. The hybrid nanoparticles can specifically realize water-responsive burst drug release in cancer cells and potentiate drug penetration into deep tumor tissues for advanced cancer therapy.

In situ real-time study on dynamics of microbially induced calcium carbonate precipitation at a single-cell level.

Ureolytic microbially induced calcium carbonate precipitation (MICP) is a promising green technique for addressing a variety of environmental and architectural concerns. However, the dynamics of MICP especially at the microscopic level remains relatively unexplored. In this work, by applying a bacterial tracking technique, the growth dynamics of micron-sized calcium carbonate precipitates induced by Sporosarcina pasteurii were studied at a single-cell resolution. The growth of micron-scale precipitates and ...

Successful recruitment, survival and long-term persistence of eastern oyster and hooked mussel on a subtidal, artificial restoration reef system in Chesapeake Bay.

Restoration efforts with native eastern oyster, Crassostrea virginica, in Chesapeake Bay and elsewhere have been limited by shell availability, necessitating the use of alternative structures as subtidal reefs, yet these have rarely been evaluated quantitatively. We quantified population structure, density, abundance and biomass of eastern oyster and hooked mussel, Ischadium recurvum, on a concrete modular reef (75 m2 surface area over 5 m2 of river bottom) deployed subtidally at 7 m depth in the Rappahanno...


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