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

01:14 EDT 19th June 2018 | BioPortfolio

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Showing "Global Regional Calcium Carbonate from Oyster Shell Market" PubMed Articles 1–25 of 9,100+

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...

An experimental model for calcium carbonate urolithiasis in goats.

Calcium carbonate is a common urolith type in small ruminants with no high-yield experimental model to evaluate animal susceptibility or preventative measure response.

Calcium carbonate crystallisation at charged graphite surfaces.

Calcium carbonate crystallisation on surfaces has been studied extensively due to its prominence in biomineralisation, but the role of surface charge in nucleation and growth is not well understood. We have employed potential-controlled Highly Oriented Pyrolytic Graphite (HOPG) surfaces to demonstrate the significant impact of surface charge on calcium carbonate crystallisation: at negatively charged HOPG surfaces, calcite, aragonite and vaterite all nucleate from high energy positively-charged crystal face...

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...

Chemical and microbiological evaluation of novel chemical treatment methods for acid sulfate soils.

Naturally occurring sulfide rich deposits are common along the northern Baltic Sea coast that when exposed to air, release large amounts of acid and metals into receiving water bodies. This causes severe environmental implications for agriculture, forestry, and building of infrastructure. In this study, we investigated the efficiency of ultrafine-grained calcium carbonate and peat (both separately and in combination) to mitigate acid and metal release. The experiments were carried out aerobically that mimic...

Supplementation of pig diets in the growth and termination phases with different calcium sources.

The aim of this study was to evaluate the effect of supplementation of pig diets in the growth and termination phases with different calcium sources. In experiment I, 36 whole males were distributed in randomized blocks in six groups, with six replications. A basal diet was formulated to meet the animals' nutritional requirements except for calcium (0.09%), and the sources evaluated (calcitic limestone, monodicalcium phosphate, calcinated bone flour, and oyster flour) replaced the basal diet to provide 0.59...

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.

Red mud carbonation using carbon dioxide: Effects of carbonate and calcium ions on goethite surface properties and settling.

Carbonation using CO2 appears as an attractive solution for disposing of red mud suspensions, an aluminum industry hazardous waste since it also offers an option for CO2 sequestration. Here we report the novel findings that CO32- together with Ca2+ can significantly affect the surface properties and settling of goethite, a major component of red mud. Specifically, their effects on the goethite surface chemistry, colloidal interaction forces and settling in alkaline solutions are investigated. The surface po...

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...

Assays for estimating HIV incidence: updated global market assessment and estimated economic value.

Accurate incidence estimates are needed to characterize the HIV epidemic and guide prevention efforts. HIV Incidence assays are cost-effective laboratory assays that provide incidence estimates from cross-sectional surveys. We conducted a global market assessment of HIV incidence assays under three market scenarios and estimated the economic value of improved incidence assays.

Production of bio-fertilizer from microwave vacuum pyrolysis of palm kernel shell for cultivation of Oyster mushroom (Pleurotus ostreatus).

Microwave vacuum pyrolysis of palm kernel shell (PKS) was performed to produce biochar, which was then tested as bio-fertilizer in growing Oyster mushroom (Pleurotus ostreatus). The pyrolysis approach produced biochar containing a highly porous structure with a high BET surface area of up to 270m2/g and low moisture content (≤10wt%), exhibiting desirable adsorption properties to be used as bio-fertilizer since it can act as a housing that provides many sites on which living microorganisms (mycelium or pla...

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...

Urea Hydrolysis and Calcium Carbonate Precipitation in Gypsum-Amended Broiler Litter.

Broiler () litter is subject to ammonia (NH) volatilization losses. Previous work has shown that the addition of gypsum to broiler litter can increase nitrogen mineralization and decrease NH losses due to a decrease in pH, but the mechanisms responsible for these effects are not well understood. Therefore, three laboratory studies were conducted to evaluate the effect of gypsum addition to broiler litter on (i) urease activity at three water contents, (ii) calcium carbonate precipitation, and (iii) pH. The ...

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...

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...

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 ...

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...

Comparison of Two Pearl Sacs Formed in the Same Recipient Oyster with Different Genetic Background Involved in Yellow Pigmentation in Pinctada fucata.

Color is one of the most important factors determining the commercial value of pearls. Pinctada fucata is a well-known pearl oyster producing high-quality Akoya pearls. Phenotypic variation in amount of yellow pigmentation produces white and yellowish pearls. It has been reported that polymorphism of yellow pigmentation of Akoya pearls is genetically regulated, but the responsible gene(s) has remained unknown. Here, we prepared pearl sac pairs formed in the same recipient oyster but coming from donor oyster...

Perspectives of regional paleoclimate modeling.

Regional climate modeling bridges the gap between the coarse resolution of current global climate models and the regional-to-local scales, where the impacts of climate change are of primary interest. Here, we present a review of the added value of the regional climate modeling approach within the scope of paleoclimate research and discuss the current major challenges and perspectives. Two time periods serve as an example: the Holocene, including the Last Millennium, and the Last Glacial Maximum. Reviewing t...

Uranium(VI) sorption complexes on silica in the presence of calcium and carbonate.

Uranium sorption on minerals and related solids depends to a large degree on its aqueous speciation. The present work attempts to understand the U(VI) sorption behavior on silica under environmentally relevant conditions, i.e. at neutral to weakly alkaline pH and in the presence of dissolved calcium and carbonate. Under these conditions, Ca(UO2)(CO3)32- and Ca2(UO2)(CO3)3(aq) complexes emerge as the dominant aqueous U(VI) species. The U(VI) sorption affinity was measured as a function of contact time, solut...

Commentary: Estimates of Global, Regional, and National Morbidity, Mortality, and Aetiologies of Diarrhoeal Diseases: A Systematic Analysis for the Global Burden of Disease Study 2015.

Nutritional status and survival of maintenance hemodialysis patients receiving lanthanum carbonate.

Hyperphosphatemia and poor nutritional status are associated with increased mortality. Lanthanum carbonate is an effective, calcium-free phosphate binder, but little is known about the long-term impact on mineral metabolism, nutritional status and survival.

Should Hospitals Market Opioid-Sparing Analgesia to Patients?

Substandard and falsified medical products are a global public health threat. A pilot survey of awareness among physicians in Sweden.

Substandard and falsified medical products are a public health threat, primarily associated with low- and middle-income countries. Today, the phenomenon also exists in high-income countries. Increased Internet access has opened a global market. Self-diagnosis and self-prescription have boosted the market for unregulated websites with access to falsified medicines.

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