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de Melo Pereira D, Schumacher M, Habibovic P. Cobalt-containing calcium phosphate induces resorption of biomineralized collagen by human osteoclasts. Biomater Res 2021; 25:6. [PMID: 33743840 PMCID: PMC7981861 DOI: 10.1186/s40824-021-00209-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2020] [Accepted: 03/10/2021] [Indexed: 12/23/2022] Open
Abstract
BACKGROUND Biomineralized collagen, consisting of fibrillar type-I collagen with embedded hydroxyapatite mineral, is a bone-mimicking material with potential application as a bone graft substitute. Despite the chemical and structural similarity with bone extracellular matrix, no evidence exists so far that biomineralized collagen can be resorbed by osteoclasts. The aim of the current study was to induce resorption of biomineralized collagen by osteoclasts by a two-fold modification: increasing the calcium phosphate content and introducing cobalt ions (Co2+), which have been previously shown to stimulate resorptive activity of osteoclasts. METHODS To this end, we produced biomineralized collagen membranes and coated them with a cobalt-containing calcium phosphate (CoCaP). Human osteoclasts, derived from CD14+ monocytes from peripheral blood, were differentiated directly on the membranes. Upon fluorescent staining of nuclei, F-actin and tartrate-resistant alkaline phosphatase, the cells were analyzed by laser confocal microscopy. Their resorption capacity was assessed by scanning electron microscopy (SEM), as well as indirectly quantified by measuring the release of calcium ions into cell culture medium. RESULTS The CoCaP coating increased the mineral content of the membranes by 4 wt.% and their elastic modulus from 1 to 10 MPa. The coated membranes showed a sustained Co2+ release in water of about 7 nM per 2 days. In contrast to uncoated membranes, on CoCaP-coated biomineralized collagen membranes, osteoclasts sporadically formed actin rings, and induced formation of resorption lacunae, as observed by SEM and confirmed by increase in Ca2+ concentration in cell culture medium. The effect of the CoCaP layer on osteoclast function is thought to be mainly caused by the increase of membrane stiffness, although the effect of Co2+, which was released in very low amounts, cannot be fully excluded. CONCLUSIONS This work shows the potential of this relatively simple approach to induce osteoclast resorption of biomineralized collagen, although the extent of osteoclast resorption was limited, and the method needs further optimization. Moreover, the coating method is suitable for incorporating bioactive ions of interest into biomineralized collagen, which is typically not possible using the common biomineralization methods, such as polymer-induced liquid precursor method.
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Affiliation(s)
- Daniel de Melo Pereira
- Department of Instructive Biomaterials Engineering, MERLN Institute for Technology-Inspired Regenerative Medicine, Maastricht University, Maastricht, Netherlands
| | - Matthias Schumacher
- Department of Instructive Biomaterials Engineering, MERLN Institute for Technology-Inspired Regenerative Medicine, Maastricht University, Maastricht, Netherlands
| | - Pamela Habibovic
- Department of Instructive Biomaterials Engineering, MERLN Institute for Technology-Inspired Regenerative Medicine, Maastricht University, Maastricht, Netherlands.
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Protective Effects of Yinchenhao Decoction on Cholesterol Gallstone in Mice Fed a Lithogenic Diet by Regulating LXR, CYP7A1, CYP7B1, and HMGCR Pathways. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE 2018; 2018:8134918. [PMID: 30310412 PMCID: PMC6166389 DOI: 10.1155/2018/8134918] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/09/2018] [Revised: 05/28/2018] [Accepted: 07/22/2018] [Indexed: 12/16/2022]
Abstract
The study attempted to elucidate whether lipid genes are closely associated with lipid metabolic abnormalities during the lithogenic time and how Yinchenhao Decoction (YCHD) works on the transcriptions of lipid genes against cholesterol gallstone model. C57BL/6J mice fed on lithogenic diet (LD) were used for model establishment and randomized into 5 groups. All groups received LD for different weeks with isometrically intragastric administration of YCHD or NS. Biochemical tests were measured and liver tissues were harvested for histological and genetic detection. It was found that all groups with increasing LD showed a following tendency of gallstone incidence, bile cholesterol, phospholipids, total bile acid, and cholesterol saturation index (CSI). Conversely, YCHD could significantly normalize the levels of gallstone incidence, bile lipids, and CSI (CSI<1). As lithogenic time progressed, ABCG5, ABCG8, PPAR-α, and ABCB4 were upregulated, and SREBP2, CYP7A1, and CYP7B1 were downregulated, while CYP7A1, CYP7B1, LXR, and HMGCR mRNA were increased 3-fold under the administration of YCHD. It was concluded that abnormal expressions of the mentioned genes may eventually progress to cholesterol gallstone. CYP7A1, CYP7B1, LXR, and HMGCR mRNA may be efficient targets of YCHD, which may be a preventive drug to reverse liver injury, normalize bile lipids, facilitate gallstone dissolution, and attenuate gallstone formation.
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Kim D, Lee B, Thomopoulos S, Jun YS. The role of confined collagen geometry in decreasing nucleation energy barriers to intrafibrillar mineralization. Nat Commun 2018; 9:962. [PMID: 29511184 PMCID: PMC5840387 DOI: 10.1038/s41467-018-03041-1] [Citation(s) in RCA: 62] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2017] [Accepted: 01/16/2018] [Indexed: 12/03/2022] Open
Abstract
Mineralization of collagen is critical for the mechanical functions of bones and teeth. Calcium phosphate nucleation in collagenous structures follows distinctly different patterns in highly confined gap regions (nanoscale confinement) than in less confined extrafibrillar spaces (microscale confinement). Although the mechanism(s) driving these differences are still largely unknown, differences in the free energy for nucleation may explain these two mineralization behaviors. Here, we report on experimentally obtained nucleation energy barriers to intra- and extrafibrillar mineralization, using in situ X-ray scattering observations and classical nucleation theory. Polyaspartic acid, an extrafibrillar nucleation inhibitor, increases interfacial energies between nuclei and mineralization fluids. In contrast, the confined gap spaces inside collagen fibrils lower the energy barrier by reducing the reactive surface area of nuclei, decreasing the surface energy penalty. The confined gap geometry, therefore, guides the two-dimensional morphology and structure of bioapatite and changes the nucleation pathway by reducing the total energy barrier.
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Affiliation(s)
- Doyoon Kim
- Department of Energy, Environmental & Chemical Engineering, Washington University in St. Louis, St. Louis, MO, 63130, USA
| | - Byeongdu Lee
- X-ray Science Division, Argonne National Laboratory, Argonne, IL, 60439, USA
| | - Stavros Thomopoulos
- Department of Orthopedic Surgery, Columbia University, New York, NY, 10032, USA
| | - Young-Shin Jun
- Department of Energy, Environmental & Chemical Engineering, Washington University in St. Louis, St. Louis, MO, 63130, USA.
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4
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Heterogeneous crystallization of calcium hydrogen phosphate anhydrous (monetite). Colloids Surf A Physicochem Eng Asp 2017. [DOI: 10.1016/j.colsurfa.2016.11.041] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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5
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Wang B, Liu P, Liu Z, Pan H, Xu X, Tang R. Biomimetic construction of cellular shell by adjusting the interfacial energy. Biotechnol Bioeng 2013; 111:386-95. [DOI: 10.1002/bit.25016] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2013] [Revised: 07/23/2013] [Accepted: 07/26/2013] [Indexed: 02/01/2023]
Affiliation(s)
- Ben Wang
- Center for Biomaterials and Biopathways, Department of Chemistry; Zhejiang University; Hangzhou Zhejiang 310027 China
- Institute for Translational Medicine and The Second Affiliated Hospital of Zhejiang University; School of Medicine; Zhejiang University; Hangzhou Zhejiang 310058 China
| | - Peng Liu
- Center for Biomaterials and Biopathways, Department of Chemistry; Zhejiang University; Hangzhou Zhejiang 310027 China
| | - Zhaoming Liu
- Center for Biomaterials and Biopathways, Department of Chemistry; Zhejiang University; Hangzhou Zhejiang 310027 China
| | - Haihua Pan
- Center for Biomaterials and Biopathways, Department of Chemistry; Zhejiang University; Hangzhou Zhejiang 310027 China
- Qiushi Academy for Advanced Studies; Zhejiang University; Hangzhou Zhejiang 310027 China
| | - Xurong Xu
- Center for Biomaterials and Biopathways, Department of Chemistry; Zhejiang University; Hangzhou Zhejiang 310027 China
- Qiushi Academy for Advanced Studies; Zhejiang University; Hangzhou Zhejiang 310027 China
| | - Ruikang Tang
- Center for Biomaterials and Biopathways, Department of Chemistry; Zhejiang University; Hangzhou Zhejiang 310027 China
- Qiushi Academy for Advanced Studies; Zhejiang University; Hangzhou Zhejiang 310027 China
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Soicher MA, Christiansen BA, Stover SM, Leach JK, Fyhrie DP. Remineralization of demineralized bone matrix (DBM) via alternating solution immersion (ASI). J Mech Behav Biomed Mater 2013; 26:109-18. [PMID: 23759125 DOI: 10.1016/j.jmbbm.2013.05.007] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2013] [Revised: 05/07/2013] [Accepted: 05/08/2013] [Indexed: 10/26/2022]
Abstract
In order to achieve successful clinical outcomes, biomaterials used for bone grafts must possess a number of traits including biocompatibility and osteoconductivity. These materials must also demonstrate appropriate mechanical stability to withstand handling as well as support potentially significant stresses at the implant site. Synthetic and natural polymer scaffolds used for bone tissue engineering (BTE) often lack necessary mechanical properties. Our goal was to internally mineralize natural collagenous matrix, thereby increasing mechanical properties of the material to useful levels. Published methods for intrafibrillar collagen mineralization were applied to clinically relevant-sized constructs but did not successfully deposit mineral in the interior of the constructs. To address this limitation, we developed a new technique for the remineralization of demineralized bone matrix (DBM) based on alternating solution immersion, or ASI. Mineral was removed from equine bone specimens, leaving behind a demineralized bone matrix (DBM). This matrix provides a framework for the nucleation and growth of a replacement mineral phase. Plain film radiography and microcomputed tomography (microCT) indicated accumulation of mineral within the DBM, and mechanical testing (3 point bending and compression) revealed a significant increase in stiffness between the DBM and the remineralized bone matrix (RBM). We believe this remineralization process will be useful in the preparation of stiff and strong allografts for clinical application.
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Affiliation(s)
- Matthew A Soicher
- Department of Orthopaedic Surgery, University of California, Davis School of Medicine, USA.
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Abdelkebir K, Morin-Grognet S, Gaudière F, Coquerel G, Labat B, Atmani H, Ladam G. Biomimetic layer-by-layer templates for calcium phosphate biomineralization. Acta Biomater 2012; 8:3419-28. [PMID: 22683877 DOI: 10.1016/j.actbio.2012.05.035] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2012] [Revised: 05/25/2012] [Accepted: 05/30/2012] [Indexed: 10/28/2022]
Abstract
Carboxylated, sulfated and/or phosphorylated surfaces are admitted as potential optimal templates for biomimetic deposition of calcium phosphate (CaP) coatings in view of improving implants' osseointegration. Layer-by-layer films were built up consisting of anionic chondroitin sulfate (ChS), a biological carboxylated and sulfated polysaccharide and cationic poly(l-lysine) (PLL). The films were used as soft matrices to immobilize a model phosphoprotein, phosvitin (PhV). The respective roles of ChS, PLL and PhV terminal layers on the heterogeneous nucleation kinetics and the structure of CaP deposits obtained from supersaturated solutions were inspected. Critical supersaturation ratios and induction times preceding heterogeneous nucleation were precisely determined and interpreted within the framework of classical nucleation theory in order to derive the effective interfacial energies of CaP crystals. It was found that the potency of terminal layers toward CaP nucleation increased in the order: PLL<ChS<PhV. Beyond a supersaturation threshold, PhV-terminated films exerted unique influence on the nucleation kinetics, maintaining the induction time at a constant value owing to conformational change of the PhV molecules upon calcium bridging. Promisingly, all films templated the deposition of thin (a few micrometer thick) uniform coatings of octacalcium phosphate and possibly hydroxyapatite, the two most relevant biological phases of CaP.
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Abstract
ABSTRACTMineralized biological tissues form by growth of inorganic phases in or on polymers and membranes. This paper discusses the mechanisms for these processes from a bio-mimetic point of view. Mineralization within a polymer or gel can lead to very fine precipitates because particle agglomeration is prevented and solute diffusion rates are low.Localization of mineralization appears to occur in biology by activation of particular surfaces. The possibility is discussed that this may be due to a close lattice match between the spacing of groups on the polymer and the spacing of ions in the mineral. It is shown that this mechanism is unlikely and other possibilities are discussed.
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Touny AH, Bhaduri S, Brown PW. Formation of calcium deficient HAp/collagen composites by hydrolysis of alpha-TCP. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2010; 21:2533-2541. [PMID: 20652375 DOI: 10.1007/s10856-010-4113-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2009] [Accepted: 06/02/2010] [Indexed: 05/29/2023]
Abstract
Bone-like composites containing calcium deficient hydroxyapatite (CDHAp) were formed by the hydrolysis of alpha-tricalcium phosphate (alpha-TCP) in the presence of type I collagen. CDHAp-collagen composites were synthesized using two techniques. In one technique alpha-TCP was mixed with non-milled (as-received) collagen prior to the addition of the aqueous solution. In the second, the collagen was milled with alpha-TCP in heptane at room temperature prior to its conversion to CDHAp. The effect of milling strongly facilitates the formation of CDHAp at physiological temperature. The proportion of milled collagen between 5 and 20 wt% present in the alpha-TCP/collagen composites has no significant effect on the rate of CDHAp formation. Variations in pH and in calcium and phosphate concentrations were determined as a function of collagen processing and variations specific to the presence of collagen were discerned. Compared to CDHAp or to composites containing non-milled collagen, diametrical and compressive strengths of CDHAp increased in the presence of milled collagen. Lack of collagen dispersion and incomplete formation of CDHAp during 48 h were the bases for reduced strengths of composites containing non-milled collagen.
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Affiliation(s)
- Ahmed H Touny
- Department of Mechanical Engineering, University of Toledo, Toledo, OH 43606, USA
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Xu Z, Neoh KG, Kishen A. A biomimetic strategy to form calcium phosphate crystals on type I collagen substrate. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2010. [DOI: 10.1016/j.msec.2010.03.014] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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11
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Tyllianakis M, Dalas E, Christofidou M, Kallitsis JK, Chrissanthopoulos A, Koutsoukos PG, Bartzavali C, Gourdoupi N, Papadimitriou K, Oikonomou EK, Yannopoulos SN, Sevastos D. Novel composites materials from functionalized polymers and silver coated titanium oxide capable for calcium phosphate induction, control of orthopedic biofilm infections: an "in vitro" study. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2010; 21:2201-2211. [PMID: 20512404 DOI: 10.1007/s10856-010-4086-5] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/15/2009] [Accepted: 04/26/2010] [Indexed: 05/28/2023]
Abstract
Three copolymers containing the functional groups P=O, S=O and C=O were prepared, and upon the introduction in calcium phosphate aqueous solutions at physiological conditions, "in vitro" were induced the precipitation of calcium phosphate crystals. The investigation of the crystal growth process was done at constant supersaturation. It is suggested that the negative end of the above functional groups acts as the active site for nucleation of the inorganic phase. In order to obtain the copolymer further antimicrobial activity, titania (TiO(2)) nanocrystals were incorporated in the polymer matrix after silver coverage by UV radiation. The antimicrobial resistance of the composite material (copolymer-titania/Ag) was tested against Staphylococcus epidermidis (SEM), Staphylococcus aureus (SAM), Candida parapsilosis (CAM) and Pseudomonas aeruginosa (PAM), microorganisms, using cut parts of "pi-plate" that covered with the above mentioned composite. The antimicrobial effect increased as the size of the nanocrystals TiO(2)/Ag decreased, the maximum achieved with the third polymer that contained also quartenary ammonium groups.
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Affiliation(s)
- M Tyllianakis
- Department of Orthopaedic, Patras University Hospital, 26504 Rio, Patras, Greece.
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12
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Ehrlich H, Hanke T, Born R, Fischer C, Frolov A, Langrock T, Hoffmann R, Schwarzenbolz U, Henle T, Simon P, Geiger D, Bazhenov VV, Worch H. Mineralization of biomimetically carboxymethylated collagen fibrils in a model dual membrane diffusion system. J Memb Sci 2009. [DOI: 10.1016/j.memsci.2008.10.003] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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13
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Affiliation(s)
- Lijun Wang
- Department of Chemistry, University at Buffalo, The State University of New York, Amherst, New York 14260
| | - George H. Nancollas
- Department of Chemistry, University at Buffalo, The State University of New York, Amherst, New York 14260
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14
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Dogan O, Oner M. Biomimetic mineralization of hydroxyapatite crystals on the copolymers of vinylphosphonic acid and 4-vinilyimidazole. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2006; 22:9671-5. [PMID: 17073495 DOI: 10.1021/la060918p] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
In the present work, copolymers of vinylphosphonic acid and 4-vinilyimidazole (poly(4-VIm-co-VPA)) were found to be substrates favoring the precipitation of nanohydroxyapatite (HAP) crystals from stable supersaturated solutions at pH 7.4 and 37 degrees C. Deposition kinetics were studied by the constant composition technique. The rates of crystallization both on HAP seed crystals as reference and on the copolymer in powder form were investigated at constant supersaturation conditions. The rates of HAP crystal growth on the polymeric substrate were found to depend on the amount of seed material and on the phosphate content of the copolymer.
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Affiliation(s)
- Ozlem Dogan
- Yildiz Technical University, Chemical Engineering Department, Davutpasa 34210, Istanbul, Turkey
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15
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Järn M, Areva S, Pore V, Peltonen J, Linden M. Topography and surface energy dependent calcium phosphate formation on Sol-Gel derived TiO2 coatings. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2006; 22:8209-13. [PMID: 16952264 DOI: 10.1021/la060966+] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
Heterogeneous nucleation and growth of calcium phosphate (CaP) on sol-gel derived TiO(2) coatings was investigated in terms of surface topography and surface energy. The topography of the coatings was derived from AFM measurements, while the surface energy was determined with contact angle measurements. The degree of precipitation was examined with scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The precipitation of CaP was found to be dependent on both topography and surface energy. A high roughness value when combining the RMS roughness parameter S(q) with the number of local maxima per unit area parameter S(ds) enhances CaP formation. The hydrophilicity of the coating was also found to be of importance for CaP formation. We suggest that the water contact angle, which is a direct measure of the hydrophilicity of the surface, may be used to evaluate the surface energy dependent precipitation kinetics rather than using the often applied Lewis base parameter.
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Affiliation(s)
- Mikael Järn
- Department of Physical Chemistry, Abo Akademi University, Porthansgatan 3-5, FIN-20500 Turku, Finland
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16
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Freeman JW, Silver FH. Elastic energy storage in unmineralized and mineralized extracellular matrices (ECMs): a comparison between molecular modeling and experimental measurements. J Theor Biol 2004; 229:371-81. [PMID: 15234204 DOI: 10.1016/j.jtbi.2004.04.018] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2003] [Revised: 02/17/2004] [Accepted: 04/08/2004] [Indexed: 10/26/2022]
Abstract
In order to facilitate locomotion and limb movement many animals store energy elastically in their tendons. In the turkey, much of the force generated by the gastrocnemius muscle is stored as elastic energy during tendon deformation and not within the muscle. As limbs move, the tendons are strained causing the collagen fibers in the extracellular matrices to be strained. During growth, avian tendons mineralize in the portions distal to the muscle and show increased tensile strength, modulus, and energy stored per unit strain as a result. In this study the energy stored in unmineralized and mineralized collagen fibers was measured and compared to the amount of energy stored in molecular models. Elastic energy storage values calculated using the molecular model were slightly higher than those obtained from collagen fibers, but display the same increases in slope as the fiber data. We hypothesize that these increases in slope are due to a change from the stretching of flexible regions of the collagen molecule to the stretching of less flexible regions. The elastic modulus obtained from the unmineralized molecular model correlates well with elastic moduli of unmineralized collagen from other studies. This study demonstrates the potential importance of molecular modeling in the design of new biomaterials.
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Affiliation(s)
- Joseph W Freeman
- Department of Pathology and Laboratory of Medicine, UMDNJ-Robert Wood Johnson Medical School, 675 Hoes Lane, Piscataway, NJ 08854, USA
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17
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Tarasevich BJ, Chusuei CC, Allara DL. Nucleation and Growth of Calcium Phosphate from Physiological Solutions onto Self-Assembled Templates by a Solution-Formed Nucleus Mechanism. J Phys Chem B 2003. [DOI: 10.1021/jp027445p] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- B. J. Tarasevich
- Pacific Northwest National Laboratory, Richland, Washington 99352, Department of Chemistry, University of Missouri, Rolla, Missouri 65409-0010, and Department of Chemistry and the Materials Research Institute, Pennsylvania State University, University Park, Pennsylvania 16802
| | - C. C. Chusuei
- Pacific Northwest National Laboratory, Richland, Washington 99352, Department of Chemistry, University of Missouri, Rolla, Missouri 65409-0010, and Department of Chemistry and the Materials Research Institute, Pennsylvania State University, University Park, Pennsylvania 16802
| | - D. L. Allara
- Pacific Northwest National Laboratory, Richland, Washington 99352, Department of Chemistry, University of Missouri, Rolla, Missouri 65409-0010, and Department of Chemistry and the Materials Research Institute, Pennsylvania State University, University Park, Pennsylvania 16802
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Paraskeva CA, Charalambous PC, Stokka LE, Klepetsanis PG, Koutsoukos PG, Read P, Ostvold T, Payatakes AC. Sandbed Consolidation with Mineral Precipitation. J Colloid Interface Sci 2000; 232:326-339. [PMID: 11097768 DOI: 10.1006/jcis.2000.7161] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
A new method has been developed to prevent sand reentrainment during oil production from unconsolidated or poorly consolidated reservoir formations. Consolidation of the zformation around the well is achieved through in situ precipitation of a sparingly soluble salt, namely, calcium phosphate. Control of the depth of salt formation is achieved by alternating injection, mixing, and reaction of two aqueous solutions of calcium chloride and potassium phosphate. Calcium phosphate crystals precipitate and grow on the grain surfaces, forming sufficiently uniform coatings. The formation of relatively uniform coatings on the grains causes an acceptably small decrease of the permeability, which is a feature of primary importance for oil production. The grains are gradually "cemented" with bridges of calcium phosphate crystallites and form a consolidated and still porous structure. As a result, the rate of hydrocarbon production for the problematic reservoir can be increased considerably without undesirable reentrainment of sand. The proposed method for consolidation has been successfully tested in sandbeds. Several series of experiments have been carried out under diverse conditions to establish the optimum parameter values for the implementation of this method. A set of optimum conditions at 25 degrees C were determined and these conditions gave satisfactory consolidation with permeability loss of ca. 60% of the initial value. The conditions of precipitation were chosen so that the precipitated phase was octacalcium phosphate [Ca(4)H(PO(4))(3).2.5H(2)O], along with its byproduct hydroxyapatite [Ca(5)(PO(4))(3)OH]. Experiments were also carried out at 70 degrees C and have shown that it is feasible to consolidate loose sandpacks at oil reservoir conditions. Copyright 2000 Academic Press.
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Affiliation(s)
- CA Paraskeva
- Institute of Chemical Engineering and High Temperature Processes-FORTH, Patras, GR 26 500, Greece
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19
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Ngankam PA, Lavalle P, J. C. Voegel,*, Szyk L, Decher G, Schaaf P, Cuisinier FJG. Influence of Polyelectrolyte Multilayer Films on Calcium Phosphate Nucleation. J Am Chem Soc 2000. [DOI: 10.1021/ja000783o] [Citation(s) in RCA: 95] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- P. A. Ngankam
- Contribution from the Fédération de Recherches “Odontologie” U424 INSERM, Université Louis Pasteur (ULP), 11, rue Humann, 67085 Strasbourg Cedex, France, Biozentrum, Department of Biophysical Chemistry, 4056 Basel, Switzerland, and Institut Charles Sadron (CNRS-ULP), 6, rue Boussingault, 67083 Strasbourg Cedex, France
| | - Ph. Lavalle
- Contribution from the Fédération de Recherches “Odontologie” U424 INSERM, Université Louis Pasteur (ULP), 11, rue Humann, 67085 Strasbourg Cedex, France, Biozentrum, Department of Biophysical Chemistry, 4056 Basel, Switzerland, and Institut Charles Sadron (CNRS-ULP), 6, rue Boussingault, 67083 Strasbourg Cedex, France
| | - J. C. Voegel,*
- Contribution from the Fédération de Recherches “Odontologie” U424 INSERM, Université Louis Pasteur (ULP), 11, rue Humann, 67085 Strasbourg Cedex, France, Biozentrum, Department of Biophysical Chemistry, 4056 Basel, Switzerland, and Institut Charles Sadron (CNRS-ULP), 6, rue Boussingault, 67083 Strasbourg Cedex, France
| | - L. Szyk
- Contribution from the Fédération de Recherches “Odontologie” U424 INSERM, Université Louis Pasteur (ULP), 11, rue Humann, 67085 Strasbourg Cedex, France, Biozentrum, Department of Biophysical Chemistry, 4056 Basel, Switzerland, and Institut Charles Sadron (CNRS-ULP), 6, rue Boussingault, 67083 Strasbourg Cedex, France
| | - G. Decher
- Contribution from the Fédération de Recherches “Odontologie” U424 INSERM, Université Louis Pasteur (ULP), 11, rue Humann, 67085 Strasbourg Cedex, France, Biozentrum, Department of Biophysical Chemistry, 4056 Basel, Switzerland, and Institut Charles Sadron (CNRS-ULP), 6, rue Boussingault, 67083 Strasbourg Cedex, France
| | - P. Schaaf
- Contribution from the Fédération de Recherches “Odontologie” U424 INSERM, Université Louis Pasteur (ULP), 11, rue Humann, 67085 Strasbourg Cedex, France, Biozentrum, Department of Biophysical Chemistry, 4056 Basel, Switzerland, and Institut Charles Sadron (CNRS-ULP), 6, rue Boussingault, 67083 Strasbourg Cedex, France
| | - F. J. G. Cuisinier
- Contribution from the Fédération de Recherches “Odontologie” U424 INSERM, Université Louis Pasteur (ULP), 11, rue Humann, 67085 Strasbourg Cedex, France, Biozentrum, Department of Biophysical Chemistry, 4056 Basel, Switzerland, and Institut Charles Sadron (CNRS-ULP), 6, rue Boussingault, 67083 Strasbourg Cedex, France
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Kapolos J, Mavrilas D, Missirlis Y, Koutsoukos PG. Model experimental system for investigation of heart valve calcification in vitro. JOURNAL OF BIOMEDICAL MATERIALS RESEARCH 2000; 38:183-90. [PMID: 9283962 DOI: 10.1002/(sici)1097-4636(199723)38:3<183::aid-jbm1>3.0.co;2-l] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
A model system was developed for the in vitro quantitative investigation of the calcification process occurring in heart valves. The process of heart valve calcification consists of the formation of calcium phosphates at the heart valve-biological fluid interface. Calcium phosphate deposits may consist of more than one calcium phosphate mineral phase, differing with respect to their physical and chemical properties. The kinetics of the formation of hydroxyapatite, the model inorganic compound for the calcified deposits, was precisely monitored in a reactor containing supersaturated calcium phosphate solutions in which the heart valves were immersed after being treated with glutaraldehyde and mounted on special racks. The precipitation process, accompanied with proton release in the solution, was monitored by a pair of glass-saturated calomel electrodes. Upon initiation of the formation of calcium phosphate deposits, the supersaturation in the working solution was reestablished through the addition of titrant solutions made with the appropriate concentration to compensate for the ions precipitated. With this methodology, not only the rates were measured very precisely but also the nucleation capability of the various substrates could be evaluated. Moreover, it was possible to identify the formation of intermediate calcium phosphate phases formed during the calcification process. Valves previously treated with glutaraldehyde were shown to nucleate octacalcium phosphate, which at lower supersaturations converted to the thermodynamically more stable hydroxyapatite. The rates measured were found to depend on the solution supersaturation, while the apparent order of the precipitation process was found to be 1.
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Affiliation(s)
- J Kapolos
- Department of Chemical Engineering, University of Patras, Greece
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21
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Abstract
Human dentin has a higher content of organic matrix and more non-ideal hydroxyapatite than human enamel. Ultrastructural studies indicate that root caries involves both mineral dissolution and breakdown of the organic matrix. Factors involved in the root caries process seem more complicated than those in enamel caries. Moreover, the distinct roles of acids and enzymes and the sequence of events in the root caries process are not well-understood. Although Streptococcus mutans and Actinomyces viscosus are considered to be major pathogenic micro-organisms of root caries, their roles in degradation of the organic matrix components of root dentin need clarification. The purpose of this paper is to review the basic composition of root dentin and the roles of acids and both endogenous and bacterial enzymes in the root caries process.
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Affiliation(s)
- T Z Dung
- Division of Periodontology, Yang-Ming University, Taipai, Taiwan.
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22
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Wu W, Nancollas GH. Determination of interfacial tension from crystallization and dissolution data: a comparison with other methods. Adv Colloid Interface Sci 1999; 79:229-79. [PMID: 10696260 DOI: 10.1016/s0001-8686(98)00072-4] [Citation(s) in RCA: 156] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Methods for the determination of interfacial tension between a solid and a liquid are reviewed including solubility/particle size, crystallization and dissolution kinetics. The use of solubility as a function of particle size, originally put forward by Ostwald and later corrected by Freundlich, may be unjustified for determining interfacial tension at solid-liquid interfaces. The interfacial tension values between solutions and sparingly soluble minerals such as hydroxyapatite, fluorapatite, brushite, octacalcium phosphate, calcium oxalate monohydrate, barium sulfate, calcium sulfate, calcite, and divalent metal fluorides are discussed. A comparison of these results is made with contact angle or wetting measurements. The interfacial tension values obtained from constant composition reaction kinetics are of the same order of magnitude as those determined using a contact angle method involving thin layer wicking techniques.
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Affiliation(s)
- W Wu
- Department of Chemistry, State University of New York at Buffalo 14260, USA
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23
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24
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Guigand M, Vulcain JM, Dautel-Morazin A, Bonnaure-Mallet M. In vitro study of intradentinal calcium diffusion induced by two endodontic biomaterials. J Endod 1997; 23:387-90. [PMID: 9545949 DOI: 10.1016/s0099-2399(97)80189-6] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The aim of this in vitro study was to assess intratubular calcium penetration induced by two root canal restoration materials, one calcium oxide based, and the other calcium hydroxide based. Pig teeth were restored with no preliminary root canal preparation. The filing materials were left in place for 8, 15, or 21 days. The samples were then examined using various microanalytical techniques and, in parallel, by backscattered electron image (BEI) scanning electron microscopy. The Ca/P ratios obtained by microanalysis were higher for samples restored with calcium oxide. In addition, the distances over which the ratios increased were also greater than those obtained using calcium hydroxide. BEI photographs confirm these results and show corresponding retrodiffusion fringes.
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Affiliation(s)
- M Guigand
- Department of Endodontics, Faculty of Dentistry, University of Rennes-France
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26
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Calvert P. Biomimetic mineralization: Processes and prospects. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 1994. [DOI: 10.1016/0928-4931(94)90057-4] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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27
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Dalas E. The overgrowth of calcium carbonate hexahydrate and calcium phosphate on new functionalized polymers. ACTA ACUST UNITED AC 1992. [DOI: 10.1007/bf00729643] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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28
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Boskey AL. The role of extracellular matrix components in dentin mineralization. CRITICAL REVIEWS IN ORAL BIOLOGY AND MEDICINE : AN OFFICIAL PUBLICATION OF THE AMERICAN ASSOCIATION OF ORAL BIOLOGISTS 1991; 2:369-87. [PMID: 1654141 DOI: 10.1177/10454411910020030501] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
The extracellular matrix of dentin consists of mineral (hydroxyapatite), collagen, and several noncollagenous matrix proteins. These noncollagenous matrix proteins may be mediators of cell-matrix interactions, matrix maturation, and mineralization. This review describes the current knowledge of the chemistry of mineral crystal formation in dentin with special emphasis on the roles of the dentin matrix proteins. The functions of some of these matrix proteins in the mineralization process have been deduced based on in vitro studies. Functions for others have been postulated based on analogy with some of the bone matrix proteins. Evidence suggests that several of these matrix proteins may have multiple effects on nucleation, crystal growth, and orientation of dentin hydroxyapatite.
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Affiliation(s)
- A L Boskey
- Laboratory for Ultrastructural Biochemistry, Hospital for Special Surgery, New York, New York
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29
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Dalas E, Kallitsis J, Koutsoukos PG. The growth of sparingly soluble salts on polymeric substrates. ACTA ACUST UNITED AC 1991. [DOI: 10.1016/0166-6622(91)80137-d] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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30
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Nancollas GH, LoRe M, Perez L, Richardson C, Zawacki SJ. Mineral phases of calcium phosphate. Anat Rec (Hoboken) 1989; 224:234-41. [PMID: 2672888 DOI: 10.1002/ar.1092240213] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Many studies of calcium phosphate precipitation have been made using relaxation techniques in which the concentrations of the lattice ions are allowed to decrease as equilibrium is approached. Since the nature of the phases that form depend markedly on the solution composition, this decrease can lead to concomitant phase transformations during the crystallization experiments. The results of the present constant composition (CC) studies show that defect apatites may be formed under conditions of sustained supersaturation with a non-stoichiometric coefficient dependent on the pH of the growth medium. An important factor in analyzing these experiments is the initial surface modification and ion-exchange processes involving H+ and Ca2+ ions after inoculation of the supersaturated solutions. Thereafter, active growth sites may be eliminated as the crystals undergo lattice perfection. Transformation of dicalcium phosphate dihydrate to octacalcium phosphate, involving dissolution and subsequent nucleation and growth of the new phase, is also influenced by surface roughening of the initial phase. Typical inhibitors that reduce the rate of growth of seed crystals in supersaturated solutions may actually induce the nucleation of calcium phosphate phases when immobilized on inert surfaces. This may be a factor in the modulation of crystal growth in many biological systems.
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Affiliation(s)
- G H Nancollas
- Department of Chemistry, State University of New York, Buffalo 14214
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Abstract
Improved technologies have led to the isolation of a large number of noncollagenous matrix proteins from the mineralized connective tissues. These proteins have been postulated to have many functions, but few of their suggested roles have been verified. Many of the noncollagenous matrix proteins are thought to regulate the deposition of hydroxyapatite mineral. In this review the current information on the role of these proteins in the mineralized and mineralizing connective tissues is presented along with a synopsis of the methods currently being used to elucidate these functions.
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Affiliation(s)
- A L Boskey
- Laboratory for Ultrastructural Biochemistry, Hospital for Special Surgery, New York, NY 10021
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Boskey A, Maresca M, Appel J. The effects of noncollagenous matrix proteins on hydroxyapatite formation and proliferation in a collagen gel system. Connect Tissue Res 1989; 21:171-6; discussion 177-8. [PMID: 2605941 DOI: 10.3109/03008208909050007] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
The effects of several noncollagenous matrix proteins on hydroxyapatite formation and growth were studied in a dynamic collagen gel system. In this system growth plate proteoglycan aggregates at concentrations of 1-10 micrograms/ml were effective inhibitors, desulfated aggregates from brachymorphic mice were less effective. Phosphophoryn at 1-100 micrograms/ml had no effect on formation; 60-120 micrograms/ml retarded mineral growth. Type X collagen at concentrations of 50-300 micrograms/ml had no effect on formation or growth.
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Affiliation(s)
- A Boskey
- Hospital for Special Surgery, New York, NY
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Abstract
Although it is often assumed that the thermodynamically most stable hydroxyapatite is a suitable prototype for biological minerals, it is now generally accepted that other phases such as dicalcium phosphate dihydrate and octacalcium phosphate as well as defect apatites and carbonated apatites may participate. The Constant Composition kinetics method, has been used to show that defect apatites may be formed with non-stoichiometric coefficients that depend upon the pH of the growth medium. Important factors in analyzing these experiments are the initial surface modification and ion exchange processes involving hydrogen and calcium ions following inoculation of the supersaturated solutions. Proteins and other macromolecules which may inhibit the rate of growth of calcium phosphates in supersaturated solutions are able to enhance the nucleation of these phases when immobilized on inert surfaces.
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Affiliation(s)
- G H Nancollas
- Chemistry Department State University of New York, Buffalo 14214
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