• The resulting amorphous mixture consists mostly of calcium and phosphate, but also contains varying amounts of water and hydrogen and hydroxide ions, depending on the synthesis conditions. (wikipedia.org)
  • Calculations support the description of a cluster with central Ca2+ ion surrounded by six phosphate PO43− anions, which in turn are surrounded by eight further calcium ions. (wikipedia.org)
  • The idea behind it is that the posner molecules meld and release calcium-ions which stimulises the neurons. (wikipedia.org)
  • Bone tissue is a reservoir of calcium and phosphate ions in the form of hydroxyapatite, so it plays an important role maintaining the proper calcium levels, along with in other organs [ 5 ] [ 6 ] . (encyclopedia.pub)
  • In this study, a strontium-doped hydroxyapatite (Sr-HAP) was synthesized by the sol-gel method, which used as adsorbent to remove lead ions (Pb 2+ ) from water. (researchsquare.com)
  • Thus, a more durable, less soluble, and more translucent material was developed 33 , with chemical bonding to the dental substrate by the bonding of calcium ions to carboxylic radicals existing in the enamel, dentin and cementum. (bvsalud.org)
  • The characterization results confirmed that nanometer-sized, spherical calcium phosphate particles were produced. (metu.edu.tr)
  • This study was aimed at fabrication and characterization of conjugated gold-cockleshell-derived calcium carbonate nanoparticles (Au-CSCaCO3NPs) for biomedical application. (documents.pub)
  • A systematic evaluation of mechanical and biocompatibility properties of different volume fractions of hydroxyapatite whiskers in comparison with three commercial dental composites filled with micro- and nanosilica particles was carried out. (hindawi.com)
  • Six groups with different hydroxyapatite whiskers mass fractions were taken into account in order to be compared with the performances of silica particles based composites group. (hindawi.com)
  • Data obtained show better interfacial interaction with filler/matrix until 20 wt% of hydroxyapatite whiskers partially replaced silica particles filler. (hindawi.com)
  • For this reason, in the recent five years hydroxyapatite particles and whiskers have been added as novel bioactive and biocompatible reinforcing filler in dental restorations. (hindawi.com)
  • This information is of primary interest in order to achieve a final consistency and specific formulation of hydroxyapatite whiskers mixed with silica particles filler in resin composite. (hindawi.com)
  • In particular, six different ratios of hydroxyapatite/silica particles were investigated. (hindawi.com)
  • With this aim, different mass fraction of hydroxyapatite based composites and three commercial composites loaded with silica particles were tested and compared in order to verify the effective enhancement in both biocompatibility and mechanical properties. (hindawi.com)
  • The present study evaluates the synthesis of biocompatible osteoconductive and osteoinductive nano calcium phosphate (CaP) particles by industrially applied, aerosol-derived flame spray pyrolysis method for biomedical field. (metu.edu.tr)
  • Calcium phosphate nanoparticles were produced in a range of calcium-to-phosphorus ratio, (1.20-2.19) in order to analyze the morphology and crystallinity changes, and to test the bioactivity of particles. (metu.edu.tr)
  • XRD patterns, HRTEM, SAED, and SEM analyses revealed the amorphous nature of the asprepared nano calcium phosphate particles at low Ca/P ratios. (metu.edu.tr)
  • 14] Yea X., Liua T., Li Q., Liua H., Wu Z., Comparison of Strontium and Calcium Adsorption Onto Composite Magnetic Particles Derived from Fe 3 O 4 and Bis(trimethoxysilylpropyl) amine , Colloids Surf . (nsmsi.ir)
  • The findings suggest that calcium phosphate nanoparticles produced in this work have a potential to be used as biomaterials in biomedical applications. (metu.edu.tr)
  • This paper discusses the processes of grit-blasting, plasma spraying, acid-etching, anodization and implant surface coatings with hydroxyapatite. (com.pk)
  • Ahmed F, Rashid H, Farookhi S, Verma V, Mulyar Y, Khalifa M, Sheikh Z. Surface modifications of endosseous dental implants by incorporation of roughness and hydroxyapatite coatings. (com.pk)
  • Effects of strontium-substitution in sputter deposited calcium phosphate coatings on the rate of corrosion of magnesium alloys. (pitt.edu)
  • As such, surface modification with ceramic coatings is required in order to achieve proper biomedical features and enhance their overall behavior in the human body. (infim.ro)
  • 11 Calcium phosphate-coated implants have been described in the literature which demonstrate early direct bone attachment to the hydroxyapatite surface and this occursas quickly as one month post-operatively. (com.pk)
  • Interest in calcium phosphate cements as materials for the restoration and treatment of bone tissue defects is still high. (encyclopedia.pub)
  • Calcium phosphate cements are similar in composition to the mineral component of bone tissue. (encyclopedia.pub)
  • The functionalization of calcium phosphate cements is of great clinical interest for the treatment or prevention of various diseases of bone tissue. (encyclopedia.pub)
  • In the present study, the calcium phosphate powders (HAP, HAP-TCP) were produced by a precipitation technique involving the use of aqueous solutions of calcium nitrate and diammonium hydrogen phosphate. (metu.edu.tr)
  • For example, the presence of calcium during struvite precipitation can decrease mineral purity by co-precipitating calcium carbonate and calcium phosphate minerals with struvite. (rsc.org)
  • Calcium sulphate (CaSO 4 ) and calcium carbonate (CaCO 3 ) are the other two popular choices of crosslinkers, however due to their lower solubility within an aqueous solution the gelation time is slower. (nature.com)
  • Aragon-ite as a calcium carbonate polymorph richly exists incockle shell (Anadara granosa), a molluscs popularly,also found in Malaysia [22]. (documents.pub)
  • Aragonite is biogenic unlikethe other calcium carbonate polymorphs of calcite andvaterite, making up to 95-98% of cockle shell. (documents.pub)
  • Currently, most of prior researchstudies have revealed mainly two methods of productionof calcium carbonate [26]. (documents.pub)
  • They include the co-precipitation or double decomposition and carbonationof CO2 gas through calcium hydroxide under controlledsettings, which regrettably none produces biogenic cal-cium carbonate [26-28]. (documents.pub)
  • 2015 ) prepared a hydroxyapatite/chitosan (HAP/CS) porous material with a pore size of 100 ~ 300mm to adsorb Pb 2+ , and its maximum adsorption capacity was 264.42 mg/g. (researchsquare.com)
  • In fact, it was shown that the incorporation of hydroxyapatite with whiskers morphology can provide larger load transfer and favor toughening mechanisms, thus, increasing flexural modulus and fracture toughness of resins in comparison with conventional silica based fillers [ 6 - 11 ]. (hindawi.com)
  • In addition, hydroxyapatite whiskers (wHA) have been considered the best option as reinforcing filler in comparison with other whiskers based on carbon, ceramic, glass, metal, and polymer due to the absence of cytotoxicity effects [ 12 , 13 ]. (hindawi.com)
  • 6] Park J., Photocatalytic Activity of Hydroxyapatite-Precipitated Potassium Titanate Whiskers , J. Alloys Compd . (nsmsi.ir)
  • This series is intended to give state and local government officials, soil scientists, consulting engineers, Extension agents, and citizens a basic understanding of onsite wastewater treatment and the behavior of different wastewater-borne contaminants coming from septic systems. (ufl.edu)
  • In wastewater, P exists as one of several possible phosphate compounds including orthophosphate, polyphosphates, and organic phosphate (Crites and Tchobanoglous 1998). (ufl.edu)
  • Recovery of phosphorus (P) from various types of wastewater has been proposed as a more sustainable alternative to phosphate rock mining due to concerns about the finite supply of phosphate rock, economic scarcity of phosphate, and the critical need for P in agriculture and food production. (rsc.org)
  • 6 Thus, P recovery from the most concentrated waste streams that comprise domestic wastewater, such as human urine and anaerobic digester sidestreams, 7,8 would provide an alternative to phosphate rock fertilizers while having the important benefits of decreasing nutrient loading to receiving waters and reducing operational problems caused by mineral scaling at wastewater treatment plants. (rsc.org)
  • Synthesis of Hybrid Polyphenol/Hydroxyapatite Nanomaterials with Anti-Radical Properties. (upmc.fr)
  • Precipitation from a moderately supersaturated and basic solution of a magnesium salt produces amorphous magnesium calcium phosphate (AMCP), in which magnesium incorporated into the ACP structure. (wikipedia.org)
  • The process combines leaching using dilute sulfuric acid (0.29 M) and selective precipitation using calcium oxide. (rsc.org)
  • Title: Calcium chloride and sodium phosphate in neonatal parenteral nutrition containing TrophAmine: precipitation studies and aluminum content. (aablocks.com)
  • Hybrid anion exchange resin containing hydrous ferric oxide (HAIX-Fe) was used in column tests to remove phosphate (PO 4 ) from fresh urine, hydrolyzed urine, and anaerobic digester filtrate, and subsequently recover PO 4 as struvite (MgNH 4 PO 4 ·6H 2 O) or potassium struvite (MgKPO 4 ·6H 2 O) via precipitation in the spent regenerant. (rsc.org)
  • citation needed] ACP lacks the long-range, periodic atomic-scale order of crystalline calcium phosphates. (wikipedia.org)
  • In aqueous media, ACP is easily transformed into crystalline phases such as octacalcium phosphate and apatite due to the growing of microcrystallites. (wikipedia.org)
  • Hydroxyapatite (HAP, Ca 10 (PO 4 ) 6 (OH) 2 ) has a hexagonal prismatic structure that exposes two crystalline surfaces: prism-faceted a- and basal-faceted c-surfaces. (osti.gov)
  • article{osti_1543698, title = {Effects of Controlled Crystalline Surface of Hydroxyapatite on Methane Oxidation Reactions}, author = {Oh, Su Cheun and Xu, Jiayi and Tran, Dat T. and Liu, Bin and Liu, Dongxia}, abstractNote = {Hydroxyapatite (HAP, Ca10(PO4)6(OH)2) has a hexagonal prismatic structure that exposes two crystalline surfaces: prism-faceted a- and basal-faceted c-surfaces. (osti.gov)
  • The developed process achieves around 70% phosphorus recovery as an industrial-grade (19 wt% P) dicalcium phosphate dihydrate product with minimal iron, magnesium, and aluminum contamination, while also producing value-added calcium sulfate dihydrate (gypsum) and iron/magnesium byproducts. (rsc.org)
  • Title: Budget-impact model for colonoscopy cost calculation and comparison between 2 litre PEG+ASC and sodium picosulphate with magnesium citrate or sodium phosphate oral bowel cleansing agents. (aablocks.com)
  • In this work, a strontium-doped hydroxyapatite (Sr-HAP) was synthesized by the sol-gel method. (researchsquare.com)
  • TEOS xerogel was investigated as adsorbent to removal strontium ion from aqueous solution in batch operations. (nsmsi.ir)
  • Amorphous calcium phosphate (ACP) is a glassy solid that is formed from the chemical decomposition of a mixture of dissolved phosphate and calcium salts (e.g. (wikipedia.org)
  • ACP is generally categorized into either "amorphous tricalcium phosphate" (ATCP) or calcium-deficient hydroxyapatite (CDHA). (wikipedia.org)
  • The composition of amorphous calcium phosphate is CaxHy(PO4)z·nH2O, where n is between 3 and 4.5. (wikipedia.org)
  • A commercial preparation of ACP is casein phosphopeptide-amorphous calcium phosphate (CPP-ACP), derived from cow milk. (wikipedia.org)
  • Following investigations into the composition of amorphous calcium phosphates precipitated under different conditions, Posner and Betts suggested in the mid-1970s that the structural unit of ACP was a neutral cluster Ca9(PO4)6. (wikipedia.org)
  • Amorphous calcium phosphate in combination with casein phosphopeptide has been used as a dental treatment to treat incipient dental decay. (wikipedia.org)
  • Studies have shown that it does form a remineralized phase of hydroxyapatite consistent with the natural enamel. (wikipedia.org)
  • As the main biomineral component in enamel and dentine, hydroxyapatite is responsible for their higher mechanical performances. (hindawi.com)
  • Indeed, in a study originally aimed to show that the bonding phenomenon is chemical in nature, surface topography changes in the micrometer range were observed in hydroxyapatite ceramic implants, suggesting that micromechanical interlocking contributed to the bonding mechanism [8]. (toysis.pics)
  • In the wet phosphoric acid process, the phosphate rock is reacted with sulfuric acid (H 2 SO 4 ), producing gypsum (CaSO 4 ·2H 2 O) and aqueous phosphoric acid (reaction (1) ). (rsc.org)
  • Unfolded phosphopeptides are believed to sequester ACP nanoclusters and form stable complexes in other biofluids such as urine and blood serum, preventing deposition of insoluble calcium phosphates and calcification of soft tissue. (wikipedia.org)
  • At present the most frequent choice of ionic crosslinker is Calcium Chloride (CaCl 2 ) as it typically leads to rapid gelation due to its high solubility in aqueous solutions 21 . (nature.com)
  • New iron phosphate and borophosphate compounds were synthesized and characterized by single crystal/powder X-ray diffraction, infrared spectroscopy, raman spectroscopy, thermogravimetric analysis, electron microscopy and elemental analysis. (metu.edu.tr)
  • The present study explored the effects of HAP crystal orientation in methane oxidation reactions, which revealed distinct catalytic behaviors of crystal surfaces in HAP-based materials. (osti.gov)
  • 2017 ) studied the magnetic hydroxyapatite-mixed oxidation of multi-walled carbon nanotubes (mHAP-oMWCNTs) to remove Pb 2+ in water, and the results showed that mHAP-oMWCNTs showed better performance than mHAP, mMWCNT and HAP-oMWCNTs. (researchsquare.com)
  • The X-ray diffraction pattern is broad and diffuse with a maximum at 2 θ = 25 ∘ {\displaystyle 2\theta =25^{\circ }} , and no other different features compared with well-crystallized hydroxyapatite. (wikipedia.org)
  • After this threshold, the mechanical performances decrease dramatically due to both the hydroxyapatite agglomerates formation and the low degree of resin conversion. (hindawi.com)
  • To overcome the present lack in the literature about hydroxyapatite based composite, we proposed a systematic analysis of the mechanical and biocompatibility performances of them in comparison with commercial dental composite. (hindawi.com)
  • Structural and mechanical behavior of layered zirconium phosphonate as a distributed phase in polycaprolactone. (speedmixer.uk)
  • Nanostructured TiO2-Al2O3 films and powders were prepared by a straightforward aqueous particulate sol-gel route. (sharif.edu)
  • Nanocrystalline and nanostructured TiO2-Cr2O3 thin films and powders were prepared by a facile and straightforward aqueous particulate sol-gel route at low temperature of 400°C. The prepared sols showed a narrow particle size distribution with hydrodynamic diameter in the range of 17.7 nm to 19.0 nm. (sharif.edu)
  • Nanostructured TiO2-SnO2 thin films and powders were prepared by a facile aqueous particulate sol-gel route. (sharif.edu)
  • Phosphorus does not exist in elemental form in the natural environment because elemental P is extremely reactive and readily combines with oxygen (O) to form phosphate (PO 4 ). (ufl.edu)
  • Phosphorus supplements are usually produced from high-grade phosphate rock concentrates (28-40 wt% P 2 O 5 ). (rsc.org)
  • The main role of phosphate supplements is to deliver soluble and bioavailable phosphorus to plants and livestock as crop fertilizers or animal feed additives. (rsc.org)
  • Title: Comparison of patient acceptance of sodium phosphate versus polyethylene glycol plus sodium picosulfate for colon cleansing in Japanese. (aablocks.com)
  • 2. Organic Phosphate is contributed by human excreta (feces) and food residues. (ufl.edu)
  • Organic phosphates are present in sugars, phospholipids, and nucleotides. (ufl.edu)
  • Scaffolds play an important role in tissue engineering as a substrate that can mimic the native extracellular matrix and the properties of scaffolds have been shown to affect the cell behavior such as the cell attachment, proliferation and differentiation. (wjgnet.com)
  • It is believed that ACP hydrolyzes under physiological temperatures and pH to form octacalcium phosphate as an intermediate, and then surface apatite. (wikipedia.org)
  • The effect of Al:Ti molar ratio was studied on the crystallization behavior of the products. (sharif.edu)
  • 2013 ) prepared Si-CHAP by hydrothermally doping silicon carbon into hydroxyapatite. (researchsquare.com)
  • Stabilizing Highly Loaded Silicon Nitride Aqueous Suspensions Using Comb Polymer Concrete Superplasticizers. (speedmixer.uk)
  • 2 The phosphate rock is converted to phosphoric acid (H 3 PO 4 ) which is used to produce phosphate fertilizers. (rsc.org)
  • 1,4-6 The P 2 O 5 grade, mineral form, and calcium content of these products are critical for their effective performance in their target applications and their market value. (rsc.org)
  • Title: Interaction of the non-phosphorylated peptide G7-18NATE with Grb7-SH2 domain requires phosphate for enhanced affinity and specificity. (aablocks.com)
  • Lukina Y, Safronova T, Smolentsev D, Toshev O. Calcium Phosphate Cements as Carriers of Functional Substances. (encyclopedia.pub)
  • Calcium Phosphate Cements as Carriers of Functional Substances" Encyclopedia , https://encyclopedia.pub/entry/45418 (accessed November 29, 2023). (encyclopedia.pub)
  • 40% P 2 O 5 ), while livestock feed additives are usually in the form of dicalcium phosphate (CaHPO 4 ), monocalcium phosphate (Ca(H 2 PO 4 ) 2 ), or defluorinated phosphate (Ca 3 (PO 4 ) 2 ). (rsc.org)
  • In this study, we develop an integrated process for the direct recovery and separation of dicalcium phosphate dihydrate for fertilizer and livestock feed additive production from a low-grade (2.0 wt% P) iron-rich (19.7 wt% Fe) phosphate ore. (rsc.org)
  • In the laboratory, stored samples of formulations of artificial blood, serum, urine and milk (which approximate the pH of the naturally occurring fluid) deposit insoluble phosphates. (wikipedia.org)
  • Toilet wastes contribute 30%-70% of P in the form of nucleic acids and adenosine tri-phosphate excreted in feces. (ufl.edu)
  • Her research interests include the preparation and design of materials and scaffolds for in vitro and in vivo fundamental studies, and a further focus is the provision of useful tools to assess mechanisms that govern cell behavior in regenerative medicine. (ibecbarcelona.eu)
  • Hydroxyapatite: Structure and properties. (dokumen.pub)
  • Hydroxyapatite (HA), Ca 10 (PO 4 ) 6 (OH) 2 , was introduced since 1975 as filling material for intrabony defects [ 1 - 4 ]. (hindawi.com)
  • In addition, biocompatibility test showed less cytotoxic effect with the addition of 20 wt% of hydroxyapatite in comparison with higher rates. (hindawi.com)
  • Effect of cerium-based conversion coating on corrosion behavior of squeeze cast Mg-4 wt% Y alloy in 0.1 M NaCl solution (vol 421C, 127451, 2021). (pitt.edu)