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https://www.readbyqxmd.com/read/30018599/synergistic-effect-of-newly-introduced-root-canal-medicaments-ozonated-olive-oil-and-chitosan-nanoparticles-against-persistent-endodontic-pathogens
#1
Mohamed I Elshinawy, Lamiaa A Al-Madboly, Walaa M Ghoneim, Nehal M El-Deeb
This study was conducted to investigate the antimicrobial-biofilm activity of chitosan (Ch-NPs), silver nanoparticles (Ag-NPs), ozonated olive oil (O3 -oil) either separately or combined together against endodontic pathogens. While testing the antimicrobial activity, Ch-NPs showed the least minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) values exerting eightfold higher bactericidal activity than O3 -oil against both Enterococcus faecalis and Streptococcus mutans as well as fourfold higher fungicidal activity against Candida albicans ...
2018: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29976007/use-of-ethylenediurea-edu-in-identifying-indicator-cultivars-of-indian-clover-against-ambient-ozone
#2
Suruchi Singh, Poonam Singh, S B Agrawal, Madhoolika Agrawal
Three clover (Trifolium alexandrium L.) cultivars (Bundel, Wardan and JHB-146) were assessed for their responses to ambient ozone (O3 ) with respect to growth, physiological and biochemical parameters at two rural sites (R1 and R2) using ethylenediurea (EDU). EDU solution (300ppm) was applied as soil drench, 10 days after germination (DAG) at an interval of 10 days up to 80 DAG. The average O3 concentrations were 52.76 and 60.86 ppb at R1 and R2 sites, respectively during the experimental period. Ambient O3 induced visible symptoms in all the cultivars at both the sites, with more at R2 site having high ambient O3 levels...
January 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29966835/cascading-effects-of-elevated-ozone-on-wheat-rhizosphere-microbial-communities-depend-on-temperature-and-cultivar-sensitivity
#3
F Changey, M Bagard, M Souleymane, T Z Lerch
Tropospheric ozone (O3 ) concentrations have now reached levels that can potentially affect crop production in several regions of the world. The interacting effects of the elevated O3 and temperature on plants are still unclear and their consequences on the rhizosphere microbial communities never studied yet. Here, we conducted a 3-week fumigation experiment on two cultivars of wheat with different tolerance to O3 (Premio and Soissons) at two temperatures (20 °C and 30 °C). The impacts of O3 were measured on plants physiology, rhizosphere chemical environment and microbial communities...
June 26, 2018: Environmental Pollution
https://www.readbyqxmd.com/read/29783198/toxicity-assessment-of-metal-oxide-nano-pollutants-on-tomato-solanum-lycopersicon-a-study-on-growth-dynamics-and-plant-cell-death
#4
Bilal Ahmed, Mohammad Saghir Khan, Javed Musarrat
The present study for the first time demonstrated the interactions of metal oxide (MO) nano-pollutants (CuO and Al2 O3 -NPs) with tissues and cellular DNA of tomato plants grown in soil sand: silt: clay (667:190:143) and Hoagland-hydroponic system and assessed the hazardous effects of NPs on cell physiology and biochemistry. Results of SEM equipped with EDX revealed attachment of variably shaped CuO-NPs (18 nm) and Al2 O3 -NPs (21 nm) on roots, and internalization followed by translocation in plants by ICP-MS and TEM...
September 2018: Environmental Pollution
https://www.readbyqxmd.com/read/29729693/intradiscal-ozone-therapy-for-lumbar-disc-herniation
#5
Sibel Ozcan, Arzu Muz, Aysun Yildiz Altun, Selami Ates Onal
The rationale behind intradiscal O2-O3 therapy is the pain elicited by the mechanical compression of the nerve root, which is associated with periganglionic and periradicular inflammation. This study aimed to determine the effect of intradiscal ozone injection on pain score and satisfaction of patients with low back pain (LBP) secondary to disc herniation. Patients with LBP diagnosed with disc herniation were enrolled in this clinical trial. After prepping and draping the area, intradiscal injection of ozone/oxygen mixture (10 ml, 25μg/ml) was performed under fluoroscopy guide (c-arm)...
April 30, 2018: Cellular and Molecular Biology
https://www.readbyqxmd.com/read/29728974/effects-of-cr-2-o-3-nanoparticles-on-the-chlorophyll-fluorescence-and-chloroplast-ultrastructure-of-soybean-glycine-max
#6
Jinxing Li, Yuchao Song, Keren Wu, Qi Tao, Yongchao Liang, Tingqiang Li
Chromic oxide nanoparticles (Cr2 O3 NPs) are widely used in commercial factories and can cause serious environmental problems. However, the mechanism behind Cr2 O3 NP-induced phytotoxicity remains unknown. In this study, the effects of Cr2 O3 NPs on the growth, chlorophyll fluorescence, SEM-EDS analysis, and chloroplast ultrastructure of soybean (Glycine max) were investigated to evaluate its phytotoxicity. The growth of soybean treated with various Cr2 O3 NP suspensions (0.01, 0.05, 0.1, and 0.5 g L-1 ) was significantly inhibited...
May 4, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29692070/-effects-of-elevated-ozone-concentrations-on-enzyme-activities-and-organic-acids-content-in-wheat-rhizospheric-soil
#7
Wei Qin Yin, Hao Qi Jing, Ya Bo Wang, Si Yu Wei, Yue Sun, Sheng Sen Wang, Xuai Zhi Wang
The elevated concentration of tropospheric ozone (O3 ) is an important global climate change driver, with adverse impacts on soil ecological environment and crop growth. In this study, a pot experiment was carried out in an open top chamber (OTC), to investigate the effects of elevated ozone concentration on soil enzyme activities (catalase, polyphenol oxidase, dehydrogenase and invertase), organic acids contents (oxalic acid, citric acid and malic acid) at different growth stages (tillering, jointing, heading and ripening stages) of wheat, and combined with the rhizospheric soil physicochemical properties and plant root characteristics to analyze the underlying reasons...
February 2018: Ying Yong Sheng Tai Xue Bao, the Journal of Applied Ecology
https://www.readbyqxmd.com/read/29657531/antimicrobial-efficacy-of-2-5-sodium-hypochlorite-2-chlorhexidine-and-ozonated-water-as-irrigants-in-mesiobuccal-root-canals-with-severe-curvature-of-mandibular-molars
#8
Sergio Luiz Pinheiro, Caio Cesar da Silva, Lucas Augusto da Silva, Marina P Cicotti, Carlos Eduardo da Silveira Bueno, Carlos Eduardo Fontana, Letícia R Pagrion, Natália P Dalmora, Thaís T Daque, Francisco Uf de Campos
Objective: The aim of this study is to evaluate the antimicrobial efficacy of 2.5% sodium hypochlorite, 2% chlorhexidine, and ozonated water on biofilms of Enterococcus faecalis , Streptococcus mutans , and Candida albicans in mesiobuccal root canals with severe curvature of mandibular molars. Materials and Methods: This was an experimental ex vivo study in microbiologic laboratory. Sixty mesiobuccal root canals with severe curvature of mandibular molars were contaminated with standard strains of E...
January 2018: European Journal of Dentistry
https://www.readbyqxmd.com/read/29656165/effect-of-elevated-ozone-and-varying-levels-of-soil-nitrogen-in-two-wheat-triticum-aestivum-l-cultivars-growth-gas-exchange-antioxidant-status-grain-yield-and-quality
#9
Ashutosh K Pandey, Annesha Ghosh, Madhoolika Agrawal, S B Agrawal
Tropospheric ozone (O3 ) is a phytotoxic air pollutant causing a substantial damage to plants and agriculture worldwide. Plant productivity is affected by several environmental factors, which interact with each other. Studies related to interactions involving O3 and different levels of nitrogen (N) are still rare and elusive. In the present study we grew two wheat cultivars (HD2967 and Sonalika) in open top chambers (OTC) under ambient (AO) and elevated O3 (EO) (ambient + 20 ppb O3 ) and provided two levels of N fertilization; (a) recommended nitrogen (RN), (b) 1...
August 30, 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29550700/nano-particle-dynamics-during-capillary-suction
#10
C J Kuijpers, H P Huinink, N Tomozeiu, S J F Erich, O C G Adan
Due to the increased use of nanoparticles in everyday applications, there is a need for theoretical descriptions of particle transport and attachment in porous media. It should be possible to develop a one dimensional model to describe nanoparticle retention during capillary transport of liquid mixtures in porous media. Water-glycerol-nanoparticle mixtures were prepared and the penetration process in porous Al2 O3 samples of varying pore size is measured using NMR imaging. The liquid and particle front can be measured by utilizing T2 relaxation effects from the paramagnetic nanoparticles...
July 1, 2018: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29480759/evaluation-of-antibacterial-efficiency-of-different-root-canal-disinfection-techniques-in-primary-teeth
#11
Banu Öter, Nursen Topçuog Lu, Mehmet K Tank, Sevi Burçak Çehreli
BACKGROUND: A successful primary root canal treatment depends on effective shaping and cleaning the root canal system and finally filling it with a hermetic sealer. Clinically, roots of primary teeth are difficult to shape and the irrigation/disinfection protocol has great importance on prognosis. OBJECTIVE: The present study evaluated the antibacterial efficiency of Endosafe (Orangedental GmbH & Co. KG), photo-activated disinfection (PAD; Orangedental GmbH & Co...
April 2018: Photomedicine and Laser Surgery
https://www.readbyqxmd.com/read/29475123/induced-accumulation-of-au-ag-and-cu-in-brassica-napus-grown-in-a-mine-tailings-with-the-inoculation-of-aspergillus-niger-and-the-application-of-two-chemical-compounds
#12
Eduardo González-Valdez, Alejandro Alarcón, Ronald Ferrera-Cerrato, Héctor René Vega-Carrillo, María Maldonado-Vega, Miguel Ángel Salas-Luévano, Rosalba Argumedo-Delira
This study evaluated the ability of Brassica napus for extracting gold (Au), silver (Ag) and copper (Cu) from a mine tailings, with the inoculation of two Aspergillus niger strains, and the application of ammonium thiocyanate (NH4 SCN) or ammonium thiosulfate [(NH4 )2 S2 O3 ]. After seven weeks of growth inoculated or non-inoculated plants were applied with 1 or 2 g kg-1 of either NH4 SCN or (NH4 )2 S2 O3 , respectively. Eight days after the application of the chemical compounds, plants were harvested for determining the total dry biomass, and the content of Au, Ag, and Cu in plant organs...
June 15, 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29456856/design-principles-of-perovskites-for-solar-driven-thermochemical-splitting-of-co-2
#13
Miriam Ezbiri, Michael Takacs, Boris Stolz, Jeffrey Lungthok, Aldo Steinfeld, Ronald Michalsky
Perovskites are attractive redox materials for thermo/electrochemical fuel synthesis. To design perovskites with balanced redox energetics for thermochemically splitting CO2 , the activity of lattice oxygen vacancies and stability against crystal phase changes and detrimental carbonate formation are predicted for a representative range of perovskites by electronic structure computations. Systematic trends in these materials properties when doping with selected metal cations are described in the free energy range defined for isothermal and temperature-swing redox cycles...
August 7, 2017: Journal of Materials Chemistry. A, Materials for Energy and Sustainability
https://www.readbyqxmd.com/read/29193125/elevated-ozone-concentration-decreases-whole-plant-hydraulic-conductance-and-disturbs-water-use-regulation-in-soybean-plants
#14
Wei-Wei Zhang, Miao Wang, Ai-Ying Wang, Xiao-Han Yin, Zhao-Zhong Feng, Guang-You Hao
Elevated tropospheric ozone (O3 ) concentration has been shown to affect many aspects of plant performance including detrimental effects on leaf photosynthesis and plant growth. However, it is not known whether such changes are accompanied by concomitant responses in plant hydraulic architecture and water relations, which would have great implications for plant growth and survival in face of unfavorable water conditions. A soybean (Glycine max (L.) Merr.) cultivar commonly used in Northeast China was exposed to non-filtered air (NF, averaged 24...
June 2018: Physiologia Plantarum
https://www.readbyqxmd.com/read/29146362/ozone-treatment-for-pesticide-removal-from-carrots-optimization-by-response-surface-methodology
#15
Lauana Pellanda de Souza, Lêda Rita D'Antonino Faroni, Fernanda Fernandes Heleno, Frederico Garcia Pinto, Maria Eliana Lopes Ribeiro de Queiroz, Lucas Henrique Figueiredo Prates
The present study aimed to optimize ozone (O3) treatments, as gas and dissolved in water, to remove difenoconazole and linuron in carrots. We employed a central composite design to study three variables governing the efficacy of treatments: O3 concentration, temperature and treatment time. The temperature did not influence the efficacy of treatments. The removal percentage of pesticides increases with increases in ozone concentration and the time of treatment. O3 application promoted the removal of more than 80% of pesticides when the roots were exposed for approximately 120min at 5 and 10mgL(-1), respectively, in treatments with O3 as gas and dissolved in water...
March 15, 2018: Food Chemistry
https://www.readbyqxmd.com/read/29101364/shifts-in-microbial-communities-in-soil-rhizosphere-and-roots-of-two-major-crop-systems-under-elevated-co-2-and-o-3
#16
Peng Wang, Ellen L Marsh, Elizabeth A Ainsworth, Andrew D B Leakey, Amy M Sheflin, Daniel P Schachtman
Rising atmospheric concentrations of CO2 and O3 are key features of global environmental change. To investigate changes in the belowground bacterial community composition in response to elevated CO2 and O3 (eCO2 and eO3 ) the endosphere, rhizosphere and soil were sampled from soybeans under eCO2 and maize under eO3 . The maize rhizosphere and endosphere α-diversity was higher than soybean, which may be due to a high relative abundance of Rhizobiales. Only the rhizosphere microbiome composition of the soybeans changed in response to eCO2 , associated with an increased abundance of nitrogen fixing microbes...
November 3, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28994034/on-the-interactions-among-zinc-availability-and-responses-to-ozone-stress-in-durum-wheat-seedlings
#17
Margherita G De Biasi, Rosita Marabottini, Anna Rita Paolacci, Mario Ciaffi, Cristina Nali, Giacomo Lorenzini, Maurizio Badiani
Seedlings of durum wheat [Triticum turgidum subsp. durum (Desf.) Husn] were exposed to zinc nutrition and to ozone (O3 ) in a factorial combination: adequate (+Zn treatment) or no Zn (-Zn) in the nutrient solution, followed by exposure to either ozone-free air (filtered air, FA) or to 150 nL L-1 ozone (O3 ) for 4 h. Although omitting Zn from the nutrient solution failed to impose a genuine Zn deficiency, -Zn*FA durum wheat seedlings showed a typical deficiency behaviour, i.e. Zn mobilisation from root to shoot...
March 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28988894/a-novel-method-to-construct-an-air-quality-index-based-on-air-pollution-profiles
#18
Thuan-Quoc Thach, Hilda Tsang, Peihua Cao, Lai-Ming Ho
BACKGROUND: Air quality indices based on the maximum of sub-indices of pollutants are easy to produce and help quantify the degree of air pollution. However, they discount the additive effects of multiple pollutants and are only sensitive to changes in highest sub-index. OBJECTIVES: We propose a simple and concise method to construct an air quality index that takes into account additive effects of multiple pollutants and evaluate the extent to which this index predicts health effects...
September 29, 2017: International Journal of Hygiene and Environmental Health
https://www.readbyqxmd.com/read/28955360/combined-effects-of-elevated-o3-concentrations-and-enhanced-uv-b-radiation-of-the-biometric-and-biochemical-properties-of-soybean-roots
#19
Bing Mao, Yan Wang, Tian-Hong Zhao, Rong-Rong Tian, Wei Wang, Jia-Shu Ye
Enhanced ultraviolet-B (UV-B) radiation and elevated tropospheric ozone alone may inhibit the growth of agricultural crops. However, research regarding their combined effects on growth and biochemical properties of roots is still scarce. Using open top chambers, we monitored the response of growth, secondary metabolites, endogenous hormones and enzyme activities of soybean roots to elevated O3 and enhanced UV-B individually and in combination at stages of branching, flowering and podding. Our results indicated that the root biomass decreased by 23...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28624639/ozone-exposure-and-flux-based-response-relationships-with-photosynthesis-leaf-morphology-and-biomass-in-two-poplar-clones
#20
Bo Shang, Zhaozhong Feng, Pin Li, Xiangyang Yuan, Yansen Xu, Vicent Calatayud
Poplar clones 546 (P. deltoides cv. '55/56'×P. deltoides cv. 'Imperial') and 107 (P. euramericana cv. '74/76') were exposed to five ozone concentrations in 15 open-top chambers (OTCs). Both ozone exposure (AOT40, Accumulation Over a Threshold hourly ozone concentration of 40ppb) and flux-based (POD7 , Phytotoxic Ozone Dose above an hourly flux threshold of 7nmol O3 m-2 PLA (projected leaf area) s-1 ) response relationships were established with photosynthesis, leaf morphology and biomass variables. Increases in both metrics showed significant negative relationships with light-saturated photosynthesis rate, chlorophyll content, leaf mass per area, actual photochemical efficiency of PSII in the light and root biomass but not with stomatal conductance (gs ), leaf and stem biomass...
December 15, 2017: Science of the Total Environment
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