3,663 results match your criteria amorphous calcium


An evolutionary system of mineralogy. Part II: Interstellar and solar nebula primary condensation mineralogy (>4.565 Ga).

Am Mineral 2020 Oct;105(10):1508-1535

Earth and Planets Laboratory, Carnegie Institution for Science, 5251 Broad Branch Road NW, Washington, D.C. 20015, U. S. A.

The evolutionary system of mineralogy relies on varied physical and chemical attributes, including trace elements, isotopes, solid and fluid inclusions, and other information-rich characteristics, to understand processes of mineral formation and to place natural condensed phases in the deep-time context of planetary evolution. Part I of this system reviewed the earliest refractory phases that condense at > 1000 K within the turbulent expanding and cooling atmospheres of highly evolved stars. Part II considers the subsequent formation of primary crystalline and amorphous phases by condensation in three distinct mineral-forming environments, each of which increased mineralogical diversity and distribution prior to the accretion of planetesimals >4. Read More

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October 2020

The Stability of Dentin Surface Biobarrier Consisting of Mesoporous Delivery System on Dentinal Tubule Occlusion and Streptococcus Mutans Biofilm Inhibition.

Int J Nanomedicine 2021 27;16:3041-3057. Epub 2021 Apr 27.

The State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) & Key Laboratory for Oral Biomedicine Ministry of Education, School and Hospital of Stomatology, Wuhan University, Wuhan, People's Republic of China.

Background: The dentin exposure always leads to dentin hypersensitivity and/or caries. Given the dentin's tubular structure and low mineralization degree, reestablishing an effective biobarrier to stably protect dentin remains significantly challenging. This study reports a versatile dentin surface biobarrier consisting of a mesoporous silica-based epigallocatechin-3-gallate (EGCG)/nanohydroxyapatite delivery system and evaluates its stability on the dentinal tubule occlusion and the () biofilm inhibition. Read More

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The Thermodynamics of Medial Vascular Calcification.

Front Cell Dev Biol 2021 14;9:633465. Epub 2021 Apr 14.

Molecular Toxicology Group, Department of Biochemistry and Molecular and Cell Biology, University of Zaragoza, Zaragoza, Spain.

Medial vascular calcification (MVC) is a degenerative process that involves the deposition of calcium in the arteries, with a high prevalence in chronic kidney disease (CKD), diabetes, and aging. Calcification is the process of precipitation largely of calcium phosphate, governed by the laws of thermodynamics that should be acknowledged in studies of this disease. Amorphous calcium phosphate (ACP) is the key constituent of early calcifications, mainly composed of Ca and PO ions, which over time transform into hydroxyapatite (HAP) crystals. Read More

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Comparative evaluation of compressive and flexural strength, fluoride release and bacterial adhesion of GIC modified with CPP-ACP, bioactive glass, chitosan and MDPB.

J Dent Res Dent Clin Dent Prospects 2021 13;15(1):16-21. Epub 2021 Feb 13.

Department of Conservative Dentistry and Endodontics, Adhiparasakthi Dental College & Hospital, Melmaruvathur, India.

This study evaluated the incorporation of casein phosphopeptide-amorphous calcium phosphate (CPP-ACP), calcium sodium phosphosilicate bioactive glass (BAG), chitosan (CH), and methacryloyloxydodecylpyridinium bromide (MDPB) on the compressive and flexural strength, fluoride (F ) release, and bacterial adhesion of conventional glass-ionomer cement (C-GIC). Modifications were implemented by adding CPP-ACP, BAG, and CH to the glass powder, while MDPB-GIC was prepared by incorporating MDPB to the liquid of C-GIC. Custom-made molds were used for specimen preparation. Read More

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February 2021

Comparative Study of Technologies for Tubule Occlusion and Treatment of Dentin Hypersensitivity.

J Funct Biomater 2021 Apr 27;12(2). Epub 2021 Apr 27.

Department of Materials Science and Engineering, Division of Applied Materials Science, Uppsala University, 751 21 Uppsala, Sweden.

This study aimed to evaluate the occluding/remineralization performance and resistance to acid attacks of the mineralization layer formed by a tooth-desensitizing gel containing amorphous calcium magnesium phosphate (ACMP) particles and compare it to six other desensitizing products available on the market. Similar comprehensive studies are few and there is especially a lack of studies that are up to date. A dentin-disc model was used for in vitro evaluation of the desensitizing toothpastes/gels. Read More

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Annexins A2, A6 and Fetuin-A Affect the Process of Mineralization in Vesicles Derived from Human Osteoblastic hFOB 1.19 and Osteosarcoma Saos-2 Cells.

Int J Mol Sci 2021 Apr 13;22(8). Epub 2021 Apr 13.

Laboratory of Biochemistry of Lipids, Nencki Institute of Experimental Biology, Polish Academy of Sciences, 3 Pasteur Str., 02-093 Warsaw, Poland.

The mineralization process is initiated by osteoblasts and chondrocytes during intramembranous and endochondral ossifications, respectively. Both types of cells release matrix vesicles (MVs), which accumulate P and Ca and form apatites in their lumen. Tissue non-specific alkaline phosphatase (TNAP), a mineralization marker, is highly enriched in MVs, in which it removes inorganic pyrophosphate (PP), an inhibitor of apatite formation. Read More

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Comparative evaluation of remineralizing potential of commercially available agents MI paste, Remin pro, and Clinpro using Scanning Electron Microscope and Energy Dispersive X-ray: An study.

J Conserv Dent 2020 Sep-Oct;23(5):457-462. Epub 2021 Feb 10.

Department of Conservative Dentistry and Endodontics, Coorg Institute of Dental Sciences, Virajpet, Karnataka, India.

Background: According to recent approaches, the prevention of initial dental caries is achieved using certain noninvasive methods. One such method is the topical application of remineralizing agents. Various remineralizing products are commercially available, but their efficacy is uncertain. Read More

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February 2021

Clinical Efficacy of Two Topical Agents for the Remineralization of Enamel White Spot Lesions in Primary Teeth.

Pediatr Dent 2021 Mar;43(2):95-101

Dr. Amaury Pozos-Guillén is an associate professor, Pediatric Dentistry Postgraduate Program, Faculty of Dentistry, San Luis Potosí University, San Luis Potosí, San Luis Potosí, Mexico;, Email:

The purpose of this study was to compare the remineralizing clinical efficacy of fluoride plus hydroxyapatite (Remin Pro®; RP) and fluoride plus casein phosphopeptide-amorphous calcium phosphate fluoride (Mi Paste Plus®; MPP) for the treatment of white spot lesions (WSLs) in primary tooth enamel. This study was a randomized double-blind clinical trial. It included patients with at least one primary maxillary anterior tooth with a WSL on the enamel surface. Read More

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Remineralization effectiveness of adhesive containing amorphous calcium phosphate nanoparticles on artificial initial enamel caries in a biofilm-challenged environment.

Clin Oral Investig 2021 Apr 23. Epub 2021 Apr 23.

State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, Department of Cariology and Endodontics, West China Hospital of Stomatology, Sichuan University, No. 14, 3rd section, Renmin Road South, Chengdu, 610041, Sichuan, China.

Objectives: Dental caries is closely associated with acid-producing bacteria, and Streptococcus mutans is one of the primary etiological agents. Bacterial accumulation and dental demineralization lead to destruction of bonding interface, thus limiting the longevity of composite. The present study investigated remineralization effectiveness of adhesive containing nanoparticles of amorphous calcium phosphate (NACP) in a stimulated oral biofilm environment. Read More

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Amorphous calcium phosphates: Solvent-controlled growth and stabilization through the Epoxide Route.

Chemistry 2021 Apr 22. Epub 2021 Apr 22.

CONICET, UNSAM, ARGENTINA.

Calcium phosphates stand among the most promising nanobiomaterials where their intrinsic properties as crystalline structure, composition, particle shape and size define their successful use in key biomedical applications as bone repairment, signalling or drug/gene delivery. Among these compounds, metastable amorphous calcium phosphate (ACP) is currently gaining particular attention due to its inherently high reactivity in solution, which is crucial in bone development mechanisms. However, the obtainment of this highly desired (bio)material with control over its shape, size and phase purity remains as a synthetic challenge. Read More

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Electrochemical Recovery of Phosphorus from Acidic Cheese Wastewater: Feasibility, Quality of Products, and Comparison with Chemical Precipitation.

ACS ES T Water 2021 Apr 1;1(4):1002-1013. Epub 2021 Mar 1.

Wetsus, Centre of Excellence for Sustainable Water Technology, P.O. Box 1113, 8900CC Leeuwarden, The Netherlands.

The recovery of phosphorus (P) from high-strength acidic waste streams with high salinity and organic loads is challenging. Here, we addressed this challenge with a recently developed electrochemical approach and compared it with the chemical precipitation method via NaOH dosing. The electrochemical process recovers nearly 90% of P (∼820 mg/L) from cheese wastewater in 48 h at 300 mA with an energy consumption of 64. Read More

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Effects of three commercial toothpastes incorporating "chitosan, casein phosphopeptide-amorphous calcium phosphate, sodium monofluorophosphate, and sodium fluoride" on remineralization of incipient enamel caries in the primary dentition: A preliminary study.

Dent Res J (Isfahan) 2020 Nov-Dec;17(6):433-438. Epub 2020 Dec 10.

Private Practice, Tehran, Iran.

Background: Given the importance of primary dental caries, assessment of new preventive/therapeutic materials is necessary. In light of the scarcity of such studies on the role of new agents in primary dentition, this study assessed the efficacy of three commercial toothpastes with different ingredients on remineralization of early caries in the primary dentition.

Materials And Methods: Thirty-nine intact primary canines were used in this experimental study. Read More

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December 2020

Nanoliposomes for encapsulation and calcium delivery of egg white peptide-calcium complex.

J Food Sci 2021 Apr;86(4):1418-1431

National Engineering Research Center of Seafood, School of Food Science and Technology, Dalian Polytechnic University, Dalian, China.

Nanoliposomes and crude liposomes loaded with egg white peptide-calcium complex (EWP-Ca) were fabricated by thin-film dispersion with or without dynamic high-pressure microfluidization. Their physiochemical properties, in vitro stability, and calcium release profiles were investigated in this study. Results showed that the EWP-Ca-loaded nanoliposomes exhibited spherical structures with a lower particle size and polydispersity index as well as a higher thermal stability as compared to the corresponding crude liposomes. Read More

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A quantitative calcium phosphate nanocluster model of the casein micelle: the average size, size distribution and surface properties.

Authors:
Carl Holt

Eur Biophys J 2021 Apr 18. Epub 2021 Apr 18.

Institute of Molecular, Cell and Systems Biology, University of Glasgow, Glasgow, G12 8QQ, UK.

Caseins (α, α, β and κ) are the main protein fraction of bovine milk. Together with nanoclusters of amorphous calcium phosphate (CaP) and divalent cations, they combine to form a polydisperse distribution of particles called casein micelles. A casein micelle model is proposed which is consistent with the way in which intrinsically disordered proteins interact through predominantly polar, short, linear, motifs. Read More

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Micropearls and other intracellular inclusions of amorphous calcium carbonate: an unsuspected biomineralization capacity shared by diverse microorganisms.

Environ Microbiol 2021 Apr 5. Epub 2021 Apr 5.

Department of Earth Sciences, University of Geneva, Geneva, CH-1205, Switzerland.

An unsuspected biomineralization process, which produces intracellular inclusions of amorphous calcium carbonate (ACC), was recently discovered in unicellular eukaryotes. These mineral inclusions, called micropearls, can be highly enriched with other alkaline-earth metals (AEM) such as Sr and Ba. Similar intracellular inclusions of ACC have also been observed in prokaryotic organisms. Read More

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Biomimetic biohybrid nanofibers containing bovine serum albumin as a bioactive moiety for wound dressing.

Mater Sci Eng C Mater Biol Appl 2021 Apr 12;123:111965. Epub 2021 Feb 12.

Institute of Biomaterials, Department of Materials Science and Engineering, University of Erlangen-Nuremberg, 91058 Erlangen, Germany.

For the first time, a biohybrid nanofibrous wound dressing is developed via green electrospinning of a blend solution of bovine serum albumin (BSA) (1 and 3 wt%) and polycaprolactone (PCL). In such a system, the components are miscible and interact through hydrogen bonding between the carbonyl group of PCL and the amine group of BSA, as verified by ATR-FTIR. As a result, the biohybrid nanofibers show a superior elastic modulus and elongation (300% and 58%, respectively) compared with the neat PCL nanofibers. Read More

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Attenuation of lipid levels in triton induced hyperlipidemia rats through rosuvastatin calcium nanoparticles: Pharmacokinetic and pharmacodynamic studies.

Chem Phys Lipids 2021 Mar 31;237:105081. Epub 2021 Mar 31.

Department of Pharmacology, Vaagdevi Pharmacy College, Warangal, Telangana, 506 001, India; Synapse Life Sciences, Warangal, Telangana, 506 005, India. Electronic address:

The aim of this research was to study the effect of marketed tablet (Crestor®) powder suspension (MTPS) and nanoparticle formulation of rosuvastatin calcium (RC) on the pharmacokinetic (PK) and pharmacodynamic (PD) parameters in hyperlipidemia rats. The hyperlipidemia is induced by intraperitoneal injection of Triton-X-100 in 0.9 %w/v saline solution. Read More

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The Antibacterial and Remineralizing Effects of Biomaterials Combined with DMAHDM Nanocomposite: A Systematic Review.

Materials (Basel) 2021 Mar 30;14(7). Epub 2021 Mar 30.

School of Dentistry and Oral Health, Griffith University, Brisbane 4222, Australia.

Researchers have developed novel nanocomposites that incorporate additional biomaterials with dimethylaminohexadecyl methacrylate (DMAHDM) in order to reduce secondary caries. The aim of this review was to summarize the current literature and assess the synergistic antibacterial and remineralizing effects that may contribute to the prevention of secondary caries. An electronic search was undertaken in MEDLINE using PubMed, Embase, Scopus, Web of Science and Cochrane databases. Read More

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Potential of tailored amorphous multiporous calcium silicate glass for pulp capping regenerative endodontics-A preliminary assessment.

J Dent 2021 Mar 30;109:103655. Epub 2021 Mar 30.

Department of Bioscience Research, College of Dentistry, University of Tennessee Health Science Center, Memphis, TN, 38163, United States. Electronic address:

Introduction/objective: The tailored amorphous multi-porous (TAMP) material fabrication technology has led to a new class of bioactive materials possessing versatile characteristics. It has not been tested for dental applications. Thus, we aimed to assess its biocompatibility and ability to regenerate dental mineral tissue. Read More

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Dystrophic calcification and heterotopic ossification in fibrocartilaginous tissues of the spine in diffuse idiopathic skeletal hyperostosis (DISH).

Bone Res 2020 Apr 2;8(1):16. Epub 2020 Apr 2.

Bone and Joint Institute, The University of Western Ontario, London, ON, N6G 2V4, Canada.

Diffuse idiopathic skeletal hyperostosis (DISH) is a prevalent noninflammatory spondyloarthropathy characterized by ectopic mineral formation along the anterolateral aspect of the vertebral column, yet little is known about its underlying pathogenesis. Our objective was to evaluate the histopathological features and composition of ectopic mineral within spinal tissues affected by DISH in humans. Thoracic spine segments from six embalmed cadaveric donors (one female and five males; median age 82 years) meeting the radiographic diagnostic criteria for DISH were evaluated using radiological, histological, and physical analyses. Read More

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Exploring the interplay of mucin with biologically-relevant amorphous magnesium-calcium phosphate nanoparticles.

J Colloid Interface Sci 2021 Jul 16;594:802-811. Epub 2021 Mar 16.

Department of Chemistry "Ugo Schiff" and CSGI, University of Florence, via della Lastruccia 3, 50019 Sesto Fiorentino, Florence, Italy.

Hypothesis: It has been recently shown that, in our organism, the secretions of Ca, Mg and phosphate ions lead to the precipitation of amorphous magnesium-calcium phosphate nanoparticles (AMCPs) in the small intestine, where the glycoprotein mucin is one of the most abundant proteins, being the main component of the mucus hydrogel layer covering gut epithelium. Since AMCPs precipitate in vivo in a mucin-rich environment, we aim at studying the effect of this glycoprotein on the formation and features of endogenous-like AMCPs.

Experiments: AMCPs were synthesized from aqueous solution in the presence of different concentrations of mucin, and the obtained particles were characterised in terms of crystallinity, composition and morphology. Read More

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The dual anti-caries effect of carboxymethyl chitosan nanogel loaded with chimeric lysin ClyR and amorphous calcium phosphate.

Eur J Oral Sci 2021 Mar 30:e12784. Epub 2021 Mar 30.

The State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) & Key Laboratory of Oral Biomedicine Ministry of Education, School & Hospital of Stomatology, Wuhan University, Wuhan, China.

In this study, we evaluated the anti-biofilm and anti-demineralization abilities of a novel material, CMC-ClyR-ACP nanogel, designed by loading the chimeric lysin ClyR and amorphous calcium phosphate (ACP) into a nanocarrier material carboxymethyl chitosan (CMC), in a demineralization model. Dynamic light scattering, transmission electron microscopy, and Fourier transmission infrared spectroscopy showed that CMC-ClyR-ACP nanogel was synthesized successfully. Enamel samples prepared from premolars were divided into five groups according to their treatments with: (i) double distilled water ddH O, (ii) CMC-ACP, (iii) CMC-ClyR-ACP, (iv) ClyR, or (v) 0. Read More

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Shear bond strength of orthodontic brackets on intact and demineralized enamel after application of resin infiltrant, fluoride varnish and casein phosphopeptide-amorphous calcium phosphate remineralizing agents: In-vitro study.

Int Orthod 2021 Mar 25. Epub 2021 Mar 25.

Assistant Professor, Department of Material Science and engineering, Golpayegan university of technology, Golpayegan, Iran. Electronic address:

Objective: To evaluate the effects of remineralizing agents on the shear bond strength (SBS) of orthodontic brackets bonded to intact and demineralized enamel.

Material And Methods: In this in-vitro study, 160 human premolars were divided into 8 groups, including group 1 with intact enamel as the positive control, group 2 with demineralized enamel as the negative control, groups 3-5 treated with fluoride varnish, Casein Phosphopeptide-Amorphous Calcium Phosphate (CPP-ACP) and resin infiltrant on intact enamel, and groups 6-8 treated with the same agents on demineralized enamel. Brackets were bonded using the conventional method, and the samples were thermocycled. Read More

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Effect of water-to-cement ratio induced hydration on the accelerated carbonation of cement pastes.

Environ Pollut 2021 Mar 17;280:116914. Epub 2021 Mar 17.

College of Civil Engineering, Hunan University, Changsha, 410082, Hunan, China. Electronic address:

Recently, the use of accelerated carbonation curing has attracted wide attention as a promising method to reduce carbon dioxide (CO) emission and improve the mechanical properties of cement-based materials. However, the diffusion mechanism of CO in the matrix and the content of hydration products are the key factors that restrict the carbonation reaction rate. To understand the combined behavior of hydration and carbonation reactions, this paper investigates the influence of cement hydration induced by water-to-cement ratio (w/c) (ranging from 0. Read More

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Healable, Degradable, and Conductive MXene Nanocomposite Hydrogel for Multifunctional Epidermal Sensors.

ACS Nano 2021 04 26;15(4):7765-7773. Epub 2021 Mar 26.

Interdisciplinary Research Center for Artificial Intelligence, College of Materials Science and Engineering, State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China.

Conductive hydrogels have emerged as promising material candidates for epidermal sensors due to their similarity to biological tissues, good wearability, and high accuracy of information acquisition. However, it is difficult to simultaneously achieve conductive hydrogel-based epidermal sensors with reliable healability for long-term usage, robust mechanical property, environmental degradability for decreased electronic waste, and sensing capability of the physiological stimuli and the electrophysiological signals. Herein, we propose the synthesis strategy of a multifunctional epidermal sensor based on the highly stretchable, self-healing, degradable, and biocompatible nanocomposite hydrogel, which is fabricated from the conformal coating of a MXene (TiCT) network by the hydrogel polymer networks involving poly(acrylic acid) and amorphous calcium carbonate. Read More

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Time Transient of Calcium and Phosphate Ion Adsorption by Rutile Crystal Facets in Hanks' Solution Characterized by XPS.

Langmuir 2021 03 22;37(12):3597-3604. Epub 2021 Mar 22.

Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University, Tokyo 101-0062, Japan.

For the elucidation of the mechanism of calcium phosphate formation on commercially pure titanium (CP Ti) in the human body, rutile TiO single crystal plates with (001), (110), and (111) facets, namely, TiO(001), TiO(110), and TiO(111), and polycrystalline plates (TiO(poly)) were immersed in a simulated body fluid, Hanks' solution (Hanks), for 10-10 s, and the adsorption of calcium and phosphate ions was precisely characterized employing X-ray photoelectron spectroscopy (XPS). Previously published CP Ti data were used for comparison. Prior to immersion in Hanks, oxygen content was more than twice as high as that of titanium due to the existence of hydroxyl groups and water on the oxides. Read More

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Tooth mousse containing casein phosphopeptide-amorphous calcium phosphate prevents biofilm formation of Streptococcus mutans.

BMC Oral Health 2021 03 19;21(1):136. Epub 2021 Mar 19.

Department of Orthodontics, Hebrew University-Hadassah School of Dental Medicine, Jerusalem, Israel.

Background: Streptococcus mutans is a common cariogenic bacterium in the oral cavity involved in plaque formation. Casein phosphopeptide-amorphous calcium phosphate (CPP-ACP) has been introduced into tooth mousse to encourage remineralization of dental enamel. The aim of this research was to study the effect of tooth mousse containing CPP-ACP (GC Tooth Mousse®) or CPP-ACP with 0. Read More

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Adenylate kinase derived ATP shapes respiration and calcium storage of isolated mitochondria.

Biochim Biophys Acta Bioenerg 2021 Jul 11;1862(7):148409. Epub 2021 Mar 11.

Chair of Molecular Nutritional Medicine, TUM School of Life Sciences, Technical University of Munich, Germany; EKFZ - Else Kröner-Fresenius Center for Nutritional Medicine, Technical University of Munich, Germany. Electronic address:

The ratio of ADP and ATP is a natural indicator of cellular bioenergetic state and thus a prominent analyte in metabolism research. Beyond adenylate interconversion via oxidative phosphorylation and ATPase activities, ADP and ATP act as steric regulators of enzymes, e.g. Read More

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Contrasting Behaviors between Gypsum and Silica Scaling in the Presence of Antiscalants during Membrane Distillation.

Environ Sci Technol 2021 04 11;55(8):5335-5346. Epub 2021 Mar 11.

Department of Civil and Environmental Engineering, Colorado State University, Fort Collins, Colorado 80523, United States.

Mineral scaling is a major constraint that limits the performance of membrane distillation (MD) for hypersaline wastewater treatment. Although the use of antiscalants is a common industrial practice to mitigate mineral scaling, the effectiveness and underlying mechanisms of antiscalants in inhibiting different mineral scaling types have not been systematically investigated. Herein, we perform a comparative investigation to elucidate the efficiencies of antiscalant candidates with varied functional groups for mitigating gypsum scaling and silica scaling in MD desalination. Read More

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Equilibrium, Thermodynamic, Reuse, and Selectivity Studies for the Bioadsorption of Lanthanum onto Sericin/Alginate/Poly(vinyl alcohol) Particles.

Polymers (Basel) 2021 Feb 19;13(4). Epub 2021 Feb 19.

School of Chemical Engineering, University of Campinas, Albert Einstein Avenue, 13083-852 Campinas, Brazil.

In a scenario of high demand, low availability, and high economic value, the recovery of rare-earth metals from wastewater is economically and environmentally attractive. Bioadsorption is a promising method as it offers simple design and operation. The aim of this study was to investigate lanthanum bioadsorption using a polymeric bioadsorbent of sericin/alginate/poly(vinyl alcohol)-based biocomposite. Read More

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February 2021