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Rajendran Vijayakumar - One of the best experts on this subject based on the ideXlab platform.
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Efficient synthesis of silver nanoparticles from Prosopis juliflora leaf extract and its antimicrobial activity using sewage
Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy, 2012Co-Authors: KANNAN RAJA, A Saravanakumar, Rajendran VijayakumarAbstract:In this paper, aqueous extract of fresh leaves of Prosopis juliflora was used for the synthesis of silver (Ag) nanoparticles. UV-Vis spectroscopy studies were carried out to asses silver nanoparticles formation within 5 min, scanning electron microscopic was used to characterize shape of the Ag nanoparticles, X-ray diffraction analysis confirms the nanoparticles as crystalline silver and facecentered cubic type and Fourier transform infra-red assed that shows biomolecule compounds which are responsible for reduction and Capping Material of silver nanoparticles. The anti microbial activity of silver nanoparticle was performed using sewage. The approach of plant-mediated synthesis appears to be cost efficient, eco-friendly and easy methods. © 2012 Elsevier B.V. All rights reserved.
Jihua Chen - One of the best experts on this subject based on the ideXlab platform.
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physicochemical properties and cytotoxicity of an experimental resin based pulp Capping Material containing the quaternary ammonium salt and portland cement
International Endodontic Journal, 2018Co-Authors: Y W Yang, Fan Yu, Yan Dong, Li Huang, H C Zhang, Y Jiao, X D Xing, M Tian, Jihua ChenAbstract:Aim To evaluate in vitro the physicochemical properties, cytotoxicity and calcium phosphate nucleation of an experimental light-curable pulp Capping Material composed of a resin with antibacterial monomer (MAE-DB) and Portland cement (PC). Methodology The experimental Material was prepared by mixing PC with a resin containing MAE-DB at a 2 : 1 ratio. Cured pure resin containing MAE-DB served as control resin. ProRoot MTA and Dycal served as commercial controls. The depth of cure, degree of monomer conversion, water absorption and solubility of dry samples, calcium release, alkalinizing activity, calcium phosphate nucleation and the cytotoxicity of Materials were evaluated. Statistical analysis was carried out using anova followed by Tukey's HSD test (equal variance assumed) or Tamhane test (equal variance not assumed) and independent-samples t-tests. Results The experimental Material had a cure depth of 1.19 mm, and the mean degree of monomer conversion was 70.93% immediately post-cure and 88.75% at 24 h post-cure. The water absorption of the experimental Material was between those of MTA and Dycal, and its solubility was significantly less (P < 0.05) than that of Dycal and higher than that of MTA. The experimental Material exhibited continuous calcium release and an alkalinizing power between those of MTA and Dycal throughout the test period. Freshly set experimental Material, control resin and all 24-h set Materials had acceptable cytotoxicity. The experimental Material, MTA and Dycal all exhibited the formation of apatite precipitates after immersion in phosphate-buffered saline. Conclusions The experimental Material possessed adequate physicochemical properties, low cytotoxicity and good calcium phosphate nucleation.
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effect of an experimental direct pulp Capping Material on the properties and osteogenic differentiation of human dental pulp stem cells
Scientific Reports, 2016Co-Authors: Fan Yu, Yan Dong, Yanwei Yang, Haohan Yu, Huan Zhou, Li Huang, Jihua ChenAbstract:Effective pulp-Capping Materials must have antibacterial properties and induce dentin bridge formation; however, many current Materials do not satisfy clinical requirements. Accordingly, the effects of an experiment pulp-Capping Material (Exp) composed of an antibacterial resin monomer (MAE-DB) and Portland cement (PC) on the viability, adhesion, migration, and differentiation of human dental pulp stem cells (hDPSCs) were examined. Based on a Cell Counting Kit-8 assay, hDPSCs exposed to Exp extracts showed limited viability at 24 and 48 h, but displayed comparable viability to the control at 72 h. hDPSC treatment with Exp extracts enhanced cellular adhesion and migration according to in vitro scratch wound healing and Transwell migration assays. Exp significantly upregulated the expression of osteogenesis-related genes. The hDPSCs cultured with Exp exhibited higher ALP activity and calcium deposition in vitro compared with the control group. The novel Material showed comparable cytocompatibility to control cells and promoted the adhesion, migration, and osteogenic differentiation of hDPSCs, indicating excellent biocompatibility. This new direct pulp-Capping Material containing MAE-DB and PC shows promise as a potential alternative to conventional Materials for direct pulp Capping.
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in vitro antibacterial activity of a novel resin based pulp Capping Material containing the quaternary ammonium salt mae db and portland cement
PLOS ONE, 2014Co-Authors: Yanwei Yang, Yan Dong, Li Huang, Hongchen Zhang, Wei Zhou, Jihua ChenAbstract:Background Vital pulp preservation in the treatment of deep caries is challenging due to bacterial infection. The objectives of this study were to synthesize a novel, light-cured composite Material containing bioactive calcium-silicate (Portland cement, PC) and the antimicrobial quaternary ammonium salt monomer 2-methacryloxylethyl dodecyl methyl ammonium bromide (MAE-DB) and to evaluate its effects on Streptococcus mutans growth in vitro.
Yanhui Zhan - One of the best experts on this subject based on the ideXlab platform.
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control of internal phosphorus release from sediments using magnetic lanthanum iron modified bentonite as active Capping Material
Environmental Pollution, 2020Co-Authors: Yuying Zhao, Yanhui Zhan, Yan WangAbstract:Abstract The non-magnetic Capping Materials are difficult to be recycled from the water bodies after their application, leading to the increase in the cost of the sediment remediation. To address this issue, a Capping Material, i.e., magnetic lanthanum/iron-modified bentonite (M-LaFeBT) was prepared by loading lanthanum onto a magnetic iron-modified bentonite (M-FeBT) and used to control the internal phosphorus (P) loading in this study. To determine the Capping efficiency and mechanism of M-LaFeBT, the impact of M-LaFeBT and M-FeBT Capping on the mobilization of P in sediments was investigated, and the stabilization of P bound by the M-LaFeBT and M-FeBT Capping layers was evaluated. Results showed that M-LaFeBT possessed good magnetic property with a saturated magnetization of 14.9 emu/g, and exhibited good phosphate adsorption ability with a maximum monolayer sorption capacity (QMAX) of 14.3 mg P/g at pH 7. Moreover, M-LaFeBT Capping tremendously reduced the concentration of soluble reactive P (SR-P) in the overlying water (OL-water), and the reduction efficiencies were 94.7%–97.4%. Furthermore, M-LaFeBT Capping significantly decreased the concentration of SR-P in the pore water and DGT (diffusive gradient in thin films)-labile P in the profile of OL-water and sediment. Additionally, most of P bound by the M-LaFeBT Capping layer (approximately 77%) was stable under natural pH and reducing conditions. The phosphate adsorption ability for M-LaFeBT was much higher than that for M-FeBT, and the QMAX value for the former was 4.86 times higher than that for the latter. M-LaFeBT Capping gave rise to a higher reduction of DGT-labile concentration in the profile of OL-water and sediment than M-FeBT Capping. The P adsorbed by the M-LaFeBT Capping layer was more stable than that by the M-FeBT Capping layer. Results of this study demonstrate that M-LaFeBT is promising for utilization as an active Capping Material to intercept sedimentary P release into OL-water.
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Control of internal phosphorus release from sediments using magnetic lanthanum/iron-modified bentonite as active Capping Material
Environmental Pollution, 2020Co-Authors: Yuying Zhao, Yanhui Zhan, Yan WangAbstract:Abstract The non-magnetic Capping Materials are difficult to be recycled from the water bodies after their application, leading to the increase in the cost of the sediment remediation. To address this issue, a Capping Material, i.e., magnetic lanthanum/iron-modified bentonite (M-LaFeBT) was prepared by loading lanthanum onto a magnetic iron-modified bentonite (M-FeBT) and used to control the internal phosphorus (P) loading in this study. To determine the Capping efficiency and mechanism of M-LaFeBT, the impact of M-LaFeBT and M-FeBT Capping on the mobilization of P in sediments was investigated, and the stabilization of P bound by the M-LaFeBT and M-FeBT Capping layers was evaluated. Results showed that M-LaFeBT possessed good magnetic property with a saturated magnetization of 14.9 emu/g, and exhibited good phosphate adsorption ability with a maximum monolayer sorption capacity (QMAX) of 14.3 mg P/g at pH 7. Moreover, M-LaFeBT Capping tremendously reduced the concentration of soluble reactive P (SR-P) in the overlying water (OL-water), and the reduction efficiencies were 94.7%–97.4%. Furthermore, M-LaFeBT Capping significantly decreased the concentration of SR-P in the pore water and DGT (diffusive gradient in thin films)-labile P in the profile of OL-water and sediment. Additionally, most of P bound by the M-LaFeBT Capping layer (approximately 77%) was stable under natural pH and reducing conditions. The phosphate adsorption ability for M-LaFeBT was much higher than that for M-FeBT, and the QMAX value for the former was 4.86 times higher than that for the latter. M-LaFeBT Capping gave rise to a higher reduction of DGT-labile concentration in the profile of OL-water and sediment than M-FeBT Capping. The P adsorbed by the M-LaFeBT Capping layer was more stable than that by the M-FeBT Capping layer. Results of this study demonstrate that M-LaFeBT is promising for utilization as an active Capping Material to intercept sedimentary P release into OL-water.
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use of iron modified calcite as an active Capping Material to control phosphorus release from sediments in surface water bodies
Huan jing ke xue= Huanjing kexue, 2020Co-Authors: Yanhui Zhan, Mingyue Chang, Junlin WuAbstract:The use of calcite (CA) as an active Capping Material has high potential for controlling the release of phosphorus (P) from sediments, but its efficiency still needs to be enhanced. To address this issue, an iron-modified CA (Fe-CA) was prepared, the removal performance of phosphate from aqueous solution by Fe-CA was studied, and the efficiency of the use of Fe-CA as an active Capping Material to prevent the liberation of P from sediments was investigated. The results showed that Fe-CA exhibited much higher phosphate removal ability than CA. The phosphate removal efficiency of Fe-CA increased with an increase in the Fe-CA dosage. Increasing the initial phosphate concentration gave rise to an increase in the amount of phosphate removed by Fe-CA, and the maximum amount of phosphate removed by Fe-CZ reached 3.09 mg·g-1. Sediment Capping with Fe-CA could effectively control the release of soluble reactive P (SRP) from the sediment into the overlying water, leading to a very low concentration of SRP in the overlying water. Additionally, the Fe-CA Capping also resulted in the transformation of a small amount of redox-sensitive P (BD-P) and metal-oxide-bound P (NaOH-rP) in sediments to residual P (Res-P), leading to a slight increase in the stability of P in the sediment. The overwhelming majority (90.8%) of P bound by the Fe-CA Capping layer existed in the form of NaOH-rP, calcium-bound P (HCl-P), and Res-P, which are relatively very stable. Furthermore, the percentage of bioavailable P (BAP) as a proportion of total extractable P in the P-bound Fe-CA Capping layer was very low, and the bound P was re-released with difficulty into the water column for algae growth. Compared to CA Capping, the efficiency for the control of sedimentary P release into the overlying water by Fe-CA Capping was much higher, and the stability of P bound by the Fe-CA Capping layer was also higher. The results of this work indicate that Fe-CA is a very promising active Capping Material for the interception of the release of P from sediments into the overlying water.
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assessment of iron modified calcite zeolite mixture as a Capping Material to control sedimentary phosphorus and nitrogen liberation
Environmental Science and Pollution Research, 2020Co-Authors: Yanhui Zhan, Yan Wang, Yang Yu, Xiaolong Wu, Yuying ZhaoAbstract:Calcite/zeolite mixture (CZ) can be used to construct a Capping layer for the simultaneous management of phosphorus (P) and nitrogen (N) liberation from sediments into the overlying water (OVER-water). However, its control efficiency of sedimentary P release still needs to be improved. To address this issue, an iron-modified CZ (Fe-CZ) was synthesized, characterized, and employed as a Capping Material to simultaneously prevent P and N release from sediments into OVER-water. Batch and microcosm incubation experiments were performed to study the efficiency and mechanism for the control of P and N release from sediments by Capping Fe-CZ. Results showed that sediment Capping with Fe-CZ resulted in the significant reduction of soluble reactive P (SRP) and ammonium-N (NH3-N) in OVER-water, with reduction rates of 77.8–99.7% and 54.0–96.7%, respectively. Furthermore, the Fe-CZ Capping layer decreased the SRP concentration in the pore water (PORE-water) at depth of 0–30 mm and reduced the concentration of PORE-water NH3-N at depth of 0–50 mm. Moreover, the Fe-CZ Capping layer gave rise to the great decrement of the concentration of the labile P measured by DGT (diffusive gradient in thin films) technology (P-DGT) in the profile of OVER-water and sediment. Additionally, the Fe-CZ Capping resulted in the reduction of redox-sensitive P (P-BD) in the 0–50 mm sediment and caused the transformation of P-BD to calcium-bound P (P-HCl) and residual P (P-RES) in the 0–10 mm sediment as well as to P-RES in the 10–20 mm sediment. Results of this work indicate that the Fe-CZ Capping has a high potential for the simultaneous management of P and N release from sediments, and the decrease of the contents of sediment P-DGT, sediment P-BD, PORE-water SRP and PORE-water NH3-N as well as the conversion of mobile P to more stable P in the top sediment should have a significant role in the simultaneous interception of sedimentary P and N liberation into OVER-water by the Fe-CZ Capping.
Yuying Zhao - One of the best experts on this subject based on the ideXlab platform.
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control of internal phosphorus release from sediments using magnetic lanthanum iron modified bentonite as active Capping Material
Environmental Pollution, 2020Co-Authors: Yuying Zhao, Yanhui Zhan, Yan WangAbstract:Abstract The non-magnetic Capping Materials are difficult to be recycled from the water bodies after their application, leading to the increase in the cost of the sediment remediation. To address this issue, a Capping Material, i.e., magnetic lanthanum/iron-modified bentonite (M-LaFeBT) was prepared by loading lanthanum onto a magnetic iron-modified bentonite (M-FeBT) and used to control the internal phosphorus (P) loading in this study. To determine the Capping efficiency and mechanism of M-LaFeBT, the impact of M-LaFeBT and M-FeBT Capping on the mobilization of P in sediments was investigated, and the stabilization of P bound by the M-LaFeBT and M-FeBT Capping layers was evaluated. Results showed that M-LaFeBT possessed good magnetic property with a saturated magnetization of 14.9 emu/g, and exhibited good phosphate adsorption ability with a maximum monolayer sorption capacity (QMAX) of 14.3 mg P/g at pH 7. Moreover, M-LaFeBT Capping tremendously reduced the concentration of soluble reactive P (SR-P) in the overlying water (OL-water), and the reduction efficiencies were 94.7%–97.4%. Furthermore, M-LaFeBT Capping significantly decreased the concentration of SR-P in the pore water and DGT (diffusive gradient in thin films)-labile P in the profile of OL-water and sediment. Additionally, most of P bound by the M-LaFeBT Capping layer (approximately 77%) was stable under natural pH and reducing conditions. The phosphate adsorption ability for M-LaFeBT was much higher than that for M-FeBT, and the QMAX value for the former was 4.86 times higher than that for the latter. M-LaFeBT Capping gave rise to a higher reduction of DGT-labile concentration in the profile of OL-water and sediment than M-FeBT Capping. The P adsorbed by the M-LaFeBT Capping layer was more stable than that by the M-FeBT Capping layer. Results of this study demonstrate that M-LaFeBT is promising for utilization as an active Capping Material to intercept sedimentary P release into OL-water.
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Control of internal phosphorus release from sediments using magnetic lanthanum/iron-modified bentonite as active Capping Material
Environmental Pollution, 2020Co-Authors: Yuying Zhao, Yanhui Zhan, Yan WangAbstract:Abstract The non-magnetic Capping Materials are difficult to be recycled from the water bodies after their application, leading to the increase in the cost of the sediment remediation. To address this issue, a Capping Material, i.e., magnetic lanthanum/iron-modified bentonite (M-LaFeBT) was prepared by loading lanthanum onto a magnetic iron-modified bentonite (M-FeBT) and used to control the internal phosphorus (P) loading in this study. To determine the Capping efficiency and mechanism of M-LaFeBT, the impact of M-LaFeBT and M-FeBT Capping on the mobilization of P in sediments was investigated, and the stabilization of P bound by the M-LaFeBT and M-FeBT Capping layers was evaluated. Results showed that M-LaFeBT possessed good magnetic property with a saturated magnetization of 14.9 emu/g, and exhibited good phosphate adsorption ability with a maximum monolayer sorption capacity (QMAX) of 14.3 mg P/g at pH 7. Moreover, M-LaFeBT Capping tremendously reduced the concentration of soluble reactive P (SR-P) in the overlying water (OL-water), and the reduction efficiencies were 94.7%–97.4%. Furthermore, M-LaFeBT Capping significantly decreased the concentration of SR-P in the pore water and DGT (diffusive gradient in thin films)-labile P in the profile of OL-water and sediment. Additionally, most of P bound by the M-LaFeBT Capping layer (approximately 77%) was stable under natural pH and reducing conditions. The phosphate adsorption ability for M-LaFeBT was much higher than that for M-FeBT, and the QMAX value for the former was 4.86 times higher than that for the latter. M-LaFeBT Capping gave rise to a higher reduction of DGT-labile concentration in the profile of OL-water and sediment than M-FeBT Capping. The P adsorbed by the M-LaFeBT Capping layer was more stable than that by the M-FeBT Capping layer. Results of this study demonstrate that M-LaFeBT is promising for utilization as an active Capping Material to intercept sedimentary P release into OL-water.
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assessment of iron modified calcite zeolite mixture as a Capping Material to control sedimentary phosphorus and nitrogen liberation
Environmental Science and Pollution Research, 2020Co-Authors: Yanhui Zhan, Yan Wang, Yang Yu, Xiaolong Wu, Yuying ZhaoAbstract:Calcite/zeolite mixture (CZ) can be used to construct a Capping layer for the simultaneous management of phosphorus (P) and nitrogen (N) liberation from sediments into the overlying water (OVER-water). However, its control efficiency of sedimentary P release still needs to be improved. To address this issue, an iron-modified CZ (Fe-CZ) was synthesized, characterized, and employed as a Capping Material to simultaneously prevent P and N release from sediments into OVER-water. Batch and microcosm incubation experiments were performed to study the efficiency and mechanism for the control of P and N release from sediments by Capping Fe-CZ. Results showed that sediment Capping with Fe-CZ resulted in the significant reduction of soluble reactive P (SRP) and ammonium-N (NH3-N) in OVER-water, with reduction rates of 77.8–99.7% and 54.0–96.7%, respectively. Furthermore, the Fe-CZ Capping layer decreased the SRP concentration in the pore water (PORE-water) at depth of 0–30 mm and reduced the concentration of PORE-water NH3-N at depth of 0–50 mm. Moreover, the Fe-CZ Capping layer gave rise to the great decrement of the concentration of the labile P measured by DGT (diffusive gradient in thin films) technology (P-DGT) in the profile of OVER-water and sediment. Additionally, the Fe-CZ Capping resulted in the reduction of redox-sensitive P (P-BD) in the 0–50 mm sediment and caused the transformation of P-BD to calcium-bound P (P-HCl) and residual P (P-RES) in the 0–10 mm sediment as well as to P-RES in the 10–20 mm sediment. Results of this work indicate that the Fe-CZ Capping has a high potential for the simultaneous management of P and N release from sediments, and the decrease of the contents of sediment P-DGT, sediment P-BD, PORE-water SRP and PORE-water NH3-N as well as the conversion of mobile P to more stable P in the top sediment should have a significant role in the simultaneous interception of sedimentary P and N liberation into OVER-water by the Fe-CZ Capping.
Hedayat Gorjestani - One of the best experts on this subject based on the ideXlab platform.
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a histological study of pulp reaction to various water powder ratios of white mineral trioxide aggregate as pulp Capping Material in human teeth a double blinded randomized controlled trial
International Endodontic Journal, 2011Co-Authors: Arash Shahravan, Shahrzad Jalali, M Torabi, Ali Akbar Haghdoost, Hedayat GorjestaniAbstract:AIM: To compare the histological pulp reaction to various water/powder ratios of white mineral trioxide aggregate (MTA) as a pulp-Capping Material in healthy human teeth. METHODOLOGY: Twenty-nine disease-free maxillary and mandibular third molar teeth, scheduled for extraction, were exposed mechanically and then capped with 0.28, 0.33 and 0.40 water/powder ratios of white MTA (ProRoot; Dentsply Maillefer, Ballaigues, Switzerland) and restored with glass ionomer. After 30 days, the teeth were extracted, resected apically and immersed in 10% formalin. For histological processing, the teeth were sectioned buccolingually in 5-μm-thick slices, stained with Haematoxylin and Eosin and evaluated by a light microscope. Samples were evaluated for intensity and type of inflammation, presence of necrosis, as well as continuity, morphology and thickness of calcified bridges. The data were analysed by Kruskal-Wallis and Mann-Whitney tests. RESULTS: There were no significant differences in the diameter, morphology and continuity of the calcified bridges, intensity and type of inflammation or presence of necrosis (P > 0.05) in the pulps covered by MTA with various water/powder ratios. Two teeth failed to display a calcified bridge, and one had a pulp necrosis. CONCLUSION: Water-to-powder ratios of MTA had no significant influence on the histological outcome of direct pulp Capping on healthy pulps.
