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

10:52 EDT 20th October 2018 | 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 9,100+

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.

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...


Impacts of biochar and oyster shells waste on the immobilization of arsenic in highly contaminated soils.

Soil contamination is a serious problem with deleterious impacts on global sustainability. Readily available, economic, and highly effective technologies are therefore urgently needed for the rehabilitation of contaminated sites. In this study, two readily available materials prepared from bio-wastes, namely biochar and oyster shell waste, were evaluated as soil amendments to immobilize arsenic in a highly As-contaminated soil (up to 15,000 mgAs/kg). Both biochar and oyster shell waste can effectively reduc...

A performance-based evaluation of chemically similar (carbonate) tempers from Late Prehistoric (AD 1200-1700) Ohio: Implications for human selection and production of ceramic technology.

This study was designed to assess the mechanical properties of two calcium carbonate tempers, limestone and burnt shell. These tempers have been previously compared, in separate studies, to silicate-based grit or sand temper and, relative to the latter, are assumed to possess similar mechanical properties. However, their simultaneous use at the Morrison Village site begs the question: do these two calcium carbonate tempers indeed possess similar mechanical properties? In order to assess their performance ch...

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...

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...

An investigation of oyster TGF-β receptor genes and their potential roles in early molluscan development.

Though the roles of BMP signaling development is studied extensively in insects and vertebrates, our knowledge of BMP signaling in molluscan development is limited. In the present study, we performed a genome-based analysis of TGF-β receptors in the Pacific oyster Crassostrea gigas and revealed that C. gigas possessed all five canonical members of the gene family, including three type I and two type II receptors. Whole mount in situ hybridization revealed that four receptor genes exhibited universal expres...

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 ...

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.

From Open-shell Singlet Diradicaloid to Closed-shell Global Anti-aromatic Macrocycles.

A dithieno[a,h]-s-indacene (DTI) based diradicaloid DTI-2Br was synthesized and its open-shell singlet diradical character was validated by magnetic measurements. On the other hand, its macrocyclic trimer DTI-MC3 and tetramer DTI-MC4 turned out to be closed-shell compounds with global anti-aromaticity, which was supported by X-ray crystallographic analysis and NMR spectra, assisted by ACID and 2D-NICS calculations. Such change can be explained by a subtle balance between two types of anti-ferromagnetic spin...

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...

New zonal structure and transition of the membrane to mammillae in the eggshell of chicken Gallus domesticus.

Avian eggshell is a typical bio-engineered ceramics characterized by layer structures. These layers were divided mainly by the form of crystalline calcite. Whether there exist other layer structures, how the membrane layer was transformed to the carbonate one, what form the carbonate takes after the transition. These questions remain to be clarified. Here we examined the eggshell of chicken Gallus domesticus by optical microscope, scanning electron microscope and transmission electron microscope. We found t...

Amyloid Assembly Endows Gad m 1 with Biomineralization Properties.

Acid proteins capable of nucleating Caand displaying aggregation capacity play key roles in the formation of calcium carbonate biominerals. The helix-loop helix EF-hands are the most common Ca-binding motifs in proteins. Calcium is bound by the loop region. These motifs are found in many proteins that are regulated by calcium. Gad m 1, an Atlantic cod β-parvalbumin isoform, is a monomeric EF-hand protein that acts as a Cabuffer in fish muscle; the neutral and acid apo-forms of this protein can form amyloid...

Bone substitute made from a Brazilian oyster shell functions as a fast stimulator for bone-forming cells in an animal model.

Despite their demonstrated biocompatibility and osteogenic properties, oyster shells have been reported as a potential alternative to other commonly used materials for bone substitution. This study evaluated whether an experimental bone substitute (EBS) made from a typical oyster shell of Northeastern Brazil (Crassostrea rhizophora) has effects on bone development using an animal model. Oysters were collected from a biologically assisted vivarium, and their inner layer was used for preparing an EBS. Chemica...

Environmental impacts of alternative agricultural uses of poorly drained farm land in Ireland.

Abolition of the milk quota in the European Union and favourable market conditions have stimulated the expansion of the dairy sector in Ireland, causing more milk to be produced from poorly drained land. This work evaluated the environmental impacts of alternative agricultural uses for poorly drained farm land in Ireland using life cycle assessment (LCA). The avoided burden of the displaced product was used to calculate the net environmental consequences in the context of regional or global markets. The imp...

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 ...

Effect of cross-linked chitosan iron (III) on vascular calcification in uremic rats.

Cross-linked chitosan iron (III) is a chitin-derived polymer with a chelating effect on phosphorus, but it is untested in vascular calcification. We evaluated this compound's ability to reduce hyperphosphatemia and its effect on vascular calcification in uremic rats using an adenine-based, phosphorus-rich diet for seven weeks. We used a control group to characterize the uremia. Uremic rats were divided according the treatment into chronic kidney disease, CKD-Ch-Fe(III)CL (CKD-Ch), CKD-calcium carbonate, or ...

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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