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Magnesium implant degradation provides immunomodulatory and proangiogenic effects and attenuates peri-implant fibrosis in soft tissues

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Bioactive Materials 2023年第8期26卷 353-369页

作者： heithem ben amara Diana C.Martinez Furqan A.Shah Anna Johansson Loo Lena Emanuelsson Birgitta Norlindh Regine Willumeit-Römer Tomasz Plocinski Wojciech Swieszkowski Anders Palmquist Omar Omar Peter Thomsen Department of Biomaterials Institute of Clinical SciencesSahlgrenska AcademyUniversity of GothenburgGothenburgSweden Biomaterials Group Materials Design DivisionFaculty of Materials Science and EngineeringWarsaw University of TechnologyWarsawPoland Institute of Metallic Biomaterials Helmholtz-Zentrum HereonGeesthachtGermany

Implants made of magnesium(Mg)are increasingly employed in patients to achieve osteosynthesis while degrading in *** Mg implants and Mg^(2+)have been suggested to possess anti-inflammatory properties,the clinically observed soft tissue inflammation around Mg implants is ***,using a rat soft tissue model and a 1-28 d observation period,we determined the temporo-spatial cell distribution and behavior in relation to sequential changes of pure Mg implant surface properties and Mg^(2+)*** to nondegradable titanium(Ti)implants,Mg degradation exacerbated initial *** of Mg degradation products at the tissue-implant interface,culminating at 3 d,actively initiated chemotaxis and upregulated mRNA and protein immunomodulatory markers,particularly inducible nitric oxide synthase and toll-like receptor-4 up to 6 d,yet without a cytotoxic *** vascularization was demonstrated morphologically,preceded by high expression of vascular endothelial growth *** transition to appropriate tissue repair coincided with implant surface enrichment of Ca and P and reduced peri-implant Mg^(2+)*** implants revealed a thinner fibrous encapsulation compared with *** detailed understanding of the relationship between Mg material properties and the spatial and time-resolved cellular processes provides a basis for the interpretation of clinical observations and future tailoring of Mg implants.

关键词： Magnesium Biodegradable implants Inflammation Foreign-body reaction Gene expression Neovascularization

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Geochemistry, mineral paragenesis and geothermal conditions of oreforming fluids from the Ain El Bey Cu–Fe deposit: potential occurrence of native gold and precious metal traces (North African orogenic belt, Northern Tunisia)

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Acta Geochimica 2024年第2期43卷 366-384页

作者： Rania ben Aissa Wiem ben Aissa Said Tlig Lassaad ben Aissa Abdessalem ben Haj amara Faculty of Science of Bizerte University of Carthage7021 ZarzounaBizerteTunisia Laboratoire de Recherche Ressources Materiaux et EcosystemesUniversity of Carthage7021 ZarzounaBizerteTunisia Department of Geology University Claude Bernard Lyon 169622 VilleurbanneFrance Faculty of Science of Tunis University of Tunis-El ManarRommana1068 TunisTunisia

The Ain El Bey abandoned mine, in North-West Tunisia, fits into the geodynamic context of the European and African plate boundary. Ore deposit corresponds to veins and breccia of multiphase Cu–Fe-rich mineralization related to various hydrothermal fluid circulations. Petromineralogical studies indicate a rich mineral paragenesis with a minimum of seven mineralization phases and, at least, six pyrite generations. As is also the case for galena and native silver, native gold is observed for the first time as inclusion in quartz which opens up, thus, new perspectives for prospecting and evaluating the potential for noble metals associated with the mineralization. Scanning Electron Microscope--Energy Dispersive Spectroscopy and Transmission electron microscopy analyses show, in addition, a large incorporation of trace elements, including Ag and Au, in mineral structures such as fahlores(tetrahedrite-tennantite) and chalcopyrite ones. The mineral/mineral associations, used as geothermometers, gave estimated temperatures for the mineralizing fluids varying from 254 to 330 ℃ for phase Ⅲ, from 254 to 350 ℃ for phase Ⅳ, and from 200 to 300 ℃ for phases Ⅴ and Ⅵ. The seventh and last identified mineralization phase, marked by a deposit of native gold, reflects a drop in the mineralizing fluid’s temperature(< 200 ℃) compatible with boiling conditions. Such results open up perspectives for the development of precious metal research and the revaluation of the Cu–Fe ore deposit at the Ain El Bey abandoned mine, as well as at the surrounding areas fitting in the geodynamic framework of the Africa-Europe plate boundary.

关键词： Ore-formingﬂuids Mineral geochemistry Mineral geothermometers Native silver-gold Ain El Bey Ore deposit North Tunisia

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Synthesis and structural characterization of a new yttrium phosphate: Na_(2.5)Y_(0.5)Mg_7(PO_4)_6 with fillowite-type structure

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Journal of Rare Earths 2010年第4期28卷 481-487页

作者： Hasna Jerbi Mourad Hidouri Mongi ben amara R.U. Inorganic materials Faculty of Sciences 5019 Monastir Tunisia

A new phosphate, Na2.5Y0.5Mg7(PO4)6 was synthesized as single crystals by the flux method and as a powdered sample by the Pechini technique, and investigated by single crystal X-ray diffraction, charge distribution (CD) and 31P NMR spectroscopy. This compound crystallized in the rhombohedral space group R 3 and its equivalent hexagonal cell had the following parameters: a=1.4976(6) nm, c= 4.2599(7) nm, Z=18. The structure consisted of MgO5, MgO6, YO6, (Na,Y)O8 and NaOx (x=6, 7 and 9) polyhedra which were li...

关键词： phosphate fillowite X-ray diffraction 31P NMR spectroscopy rare earths

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Na_2BaMg(PO_4 )_2:synthesis, crystal structure and europium photoluminescence properties

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Journal of Rare Earths 2013年第9期31卷 849-856页

作者： Amal Boukhris Mourad Hidouri benoit Glorieux Mongi ben amara UR:Inorganic Materials Faculty of ScienceUniversity of Monastir Institute for Condensed Matter Chemistry of Bordeaux CNRS University of Bordeaux I87Avenue of Dr.A.Schweitzer33608 Pessac-CedexFrance

Na2BaMg（PO4）2 was synthesized and characterized by X-ray diffraction, differential thermal analysis （DTA）, 31p NMR spectroscopy and photoluminescence measurements. This compound crystallized in the P3 ml space group of the trigonal system with the parameters of equivalent hexagonal cell a=0.5305（1） nm and c=0.6986（3） nm. The structure showed a perfect isotipysm with the mineral glaserite KaNa（SO4）2. Thus, it exhibited a lamellar framework which could be described as the stacking along the [001] direc- tion of [MgP2O84-]∞ layers of comer sharing MgO6 polyhedra and PO4 tetrahedra. The Ba2＋ cations were located within the interlayer space, while the Na＋ ones were found in large cavities bound to the layers. The DTA analysis showed that this compound melt con- gruently at 1385 K. The 31p NMR spectrum was consistent with the presence of a single phosphorus site in the structure. Optical properties were investigated for the 5% doped Eu3＋ and Eu2＋ phases. The trivalent europium was used as a local probe, replacing bar- ium while the divalent europium was used to examine whether this material could be used as an optical applications.

关键词： phosphate 31p NMR crystal structure europium photoluminescence rare earths

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Efficacy of Essential Trace Elements Supplementation on Mineral Composition,Sperm Characteristics,Antioxidant Status,and Genotoxicity in Testis of Tebuconazole-treated Rats

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Biomedical and Environmental Sciences 2020年第10期33卷 760-770页

作者： Hajer ben SAAD Fatma ben ABDALLAH Intidhar BKHAIRIA Ons BOUDAWARA Moncef NASRI Ahmed HAKIM Ibtissem ben amara Laboratory of Enzyme engineering and Microbiology National Engineering School in SfaxUniversity of SfaxB.P.11733038 SfaxTunisia Laboratory of Human Molecular Genetics Faculty of Medicine ofSfaxUniversity of SfaxTunisia Laboratory of Anatomopathology CHU Habib BourguibaUniversity of Sfax3029 SfaxTunisia Laboratory of Pharmacology Faculty of Medicine3029 SfaxUniversity of SfaxTunisia

Objective This research was performed to evaluate the effect of tebuconazole(TBZ)on reproductive organs of male rats and to assess the protective role of combined essential trace elements in alleviating the detrimental effect of TBZ on male reproductive *** For this purpose,48 rats were exposed to 100 mg/kg TBZ,TBZ supplemented with zinc(Zn),selenium(Se),copper(Cu),and iron(Fe),TBZ+(Se+Zn);TBZ+Cu;or TBZ+*** experiment was conducted for 30 consecutive *** TBZ caused a significant perturbation in mineral levels and reduction in reproductive organs weights,plasma testosterone level,and testicular antioxidant enzyme *** TBZ-treated group also showed a significant increase in sperm abnormalities(count,motility,and viability percent),plasma follicle-stimulating hormone and luteinizing hormone concentrations,lipid peroxidation,protein oxidation,and severe DNA degradation in comparison with the ***,TBZ caused testis ***,treatment with trace elements,in combination or alone,improved the reproductive organ weights,sperm characteristics,TBZ-induced toxicity,and histopathological modifications in *** TBZ exerts significant harmful effects on male reproductive *** concurrent administration of trace elements reduces testis dysfunction,fertility,and toxicity induced by TBZ.

关键词： Zinc Selenium Iron Copper Testicular toxicity

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Inter-comparative Study of Quantitative Methods of Industrial Clinker

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Journal of Wuhan University of Technology(Materials Science) 2017年第6期32卷 1250-1260页

作者： benmohamed Mohamed Galai Haykel Alouani Rabah Bejaoui Marouene ben Haj amara Abdessalem ben Rhaim Hafsia UR05/13-01 Physique des Materiaux Lamellaires et Nanomateriaux Hybrides (PMLNMH) Faeulte des Sciences de Bizerte Universitede Carthage Zarzouna 7021 Tunisia Institut National de Recherche et d'Analyse Physico-chimiques 2026 Technopole de Sidi Thabet Tunisia

Impurities from the raw materials, the grinding and the homogenization of the raw materials, the kiln instability and the complexity of the cooling step, all these factors make it difficult to obtain a perfect evaluation of the mineralogical composition of Portland clinker. We studied the limitations of the most commonly used quantitative methods and recommend some procedures to obtain reliable and reproducible results of quantitative analyses. Different clinker samples（provided by the Bizerte Cement Company（Tunisia）） were subjected to an elemental analysis by X-ray fluorescence and the mineralogical composition was determined by the Bogue calculation and by X-ray powder diffraction combined with the Rietveld method（Different softwares were used： XPert High Score Plus version 2.0 and TOPAS version 4.2）. We then compared the results obtained by the Rietveld method and the Bogue calculation to the specific peak areas of each phase. The content of each phase, determined by the Rietveld method, varied proportionally to the change in peak area; a significant difference in these results was found by using the elementary Bogue calculation.

关键词： portland clinker bogue calculation rietveld method quantitative mineralogy specificpeaks different software

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Effect of temperature and pH value on cation exchange performance of a natural clay for selective(Cu2+,Co2+) removal:Equilibrium,sorption and kinetics

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Progress in Natural Science:Materials International 2013年第1期23卷 23-35页

作者： Ramzi Chalghaf Walid Oueslati Marwa Ammar Hafsia ben Rhaiem Abdesslem ben Haj amara UR05/13-01:Physique des Matériaux Lamellaires et Nanomatériaux Hybrides(PMLNMH) Facultédes Sciences de BizerteZarzouna 7021Tunisia

This work aims at investigating the strain effect,created by varying pH solution and continuous heating cycle,on the cation exchange process in the case of Na-rich montmorillonite sample in contact with bi-ionic solution with variable concentration,saturated respectively by Co2+ and Cu2+ *** ionic exchange process is characterized using XRD analysis obtained through the comparison of experimental XRD patterns with calculated ones,which allowed us to determine several structural parameters related to the nature,abundance,size,position and organization of exchangeable cation and water molecule in the interlamellar space along the ***,the proposed theoretical models,for the stressed samples,show that the structure presents an interstratified hydration character and proves the coexistence of more than two ''crystallite'' specie in the *** perturbation types have an obvious effect on the selective exchange process for all stressed samples,where the interlayer space is characterized by the coexistence of more one exchangeable cation.

关键词： Geological membrane Soil decontamination Alkaline strain Thermal stress Quantitative XRD analysis Ionic exchange process

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Dimethoate Induced Oxidative Damage and Histopathological Changes in lung of Adult rats:Modulatory Effects of Selenium and/or Vitamin E

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Biomedical and Environmental Sciences 2012年第3期25卷 340-351页

作者： Ibtissem ben amara Nejla SOUDANI Afef TROUDI Ahmed HAKIM Khaled Mounir ZEGHAL Tahia BOUDAWARA Najiba ZEGHAL Animal Physiology Laboratory Faculty of ScienceBP11713000 SfaxUniversity of SfaxTunisia Laboratory of Pharmacology Faculty of Medicine3029 SfaxUniversity of Sfax Tunisi Anatomopathology Laboratory CHU Habib Bourguiba 3029 SfaxUniversity of SfaxTunisia

Objective To determine the efficiency of selenium and/or vitamin E to alleviate lung oxidative damage induced by dimethoate, an organophosphorus compound. Methods Adult Wistar rats were exposed during 30 days either to dimethoate （0.2 g/L of drinking water）, dimethoate＋selenium （0.5 mg/kg of diet）, dimethoate＋vitamin E （100 mg/kg of diet）, or dimethoate＋selenium＋vitamin E. Results Exposure to dimethoate caused oxidative stress in lung evidenced by an increase of malondialdehyde, protein carbonyl groups and advanced oxidation protein products. An increase in glutathione peroxidase, superoxide dismutase, catalase and a decrease in acetylcholinesterase and butyrylcholinesterase activities, glutathione, non-protein thiols and vitamins C levels were observed. Histopathological changes in lung tissue were noted as emphysema, hemorrhages and hemosiderin deposits. Co-administration of selenium or vitamin E to the diet of dimethoate treated rats ameliorated the biochemical parameters as well as histological impairments. The joint effect of these elements was more powerful in antagonizing dimethoate-induced lung oxidative damage. Conclusion We concluded that selenium and vitamin E ameliorated the toxic effects of this pesticide in lung tissue suggesting their role as potential antioxidants.

关键词： Dimethoate Selenium Vitamin E Rats Lung Antioxidant status Histopathological studies

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Potassium Bromate-induced Changes in the Adult Mouse Cerebellum Are Ameliorated by Vanillin

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Biomedical and Environmental Sciences 2018年第2期31卷 115-125页

作者： Hajer ben Saad Dorra Driss Imen Jaballi Hanen Ghozzi Ons Boudawara Michael Droguet Christian Magne Monsef Nasri Khaled Mounir Zeghal Ahmed Hakim Ibtissem ben amara Laboratory of Pharmacology University of SfaxFaculty of Medicine3029 SfaxTunisia Laboratory of Enzyme engineering and Microbiology National Engineering School in SfaxUniversity of SfaxB.P.11733038 SfaxTunisia Centre of Biotechnology of Sfax P.O.Box 11773018 SfaxTunisia Anatomopathology Laboratory University of SfaxHabib Bourguiba Hospital3029 SfaxTunisia EA 4324 ORPHY Faculty of MedicineUniversity of Brest29238 Brest CedexFrance EA 2219 Geoarchitecture University of BrestUFR Sciences&Techniques29238 Brest Cedex 3France

Objective The current study aimed to elucidate the effect of vanillin on behavioral changes, oxidative stress, and histopathological changes induced by potassium bromate （KBrO3）, an environmental pollutant, in the cerebellum of adult *** The animals were divided into four groups： group 1 served as a control, group 2 received KBrO3, group 3 received KBrO3 and vanillin, and group 4 received only vanillin. We then measured behavioral changes, oxidative stress, and molecular and histological changes in the *** We observed significant behavioral changes in KBrO3-exposed mice. When investigating redox homeostasis in the cerebellum, we found that mice treated with KBrO3 had increased lipid peroxidation and protein oxidation in the cerebellum. These effects were accompanied by decreased Na＋-K＋ and Mg2＋ ATPase activity and antioxidant enzyme gene expression when compared to the control group. Additionally, there was a significant increase in cytokine gene expression in KBrO3-treated mice. Microscopy revealed that KBrO3 intoxication resulted in numerous degenerative changes in the cerebellum that were substantially ameliorated by vanillin supplementation. Co-administration of vanillin blocked the biochemical and molecular anomalies induced by *** Our results demonstrate that vanillin is a potential therapeutic agent for oxidative stress associated with neurodegenerative diseases.

关键词： Cerebellum Behavior Potassium bromate Vanillin ATPases Genes expression

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End-to-End Multiview Gesture Recognition for Autonomous Car Parking System

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Instrumentation 2019年第3期6卷 76-92页

作者： Hassene ben amara Fakhri KARRAY Centre for Pattern Analysis and Machine Intelligence(CPAMI) Electrical and Computer EngineeringThe University of Waterloo

The use of hand gestures can be the most intuitive human-machine interaction *** early approaches for hand gesture recognition used device-based *** methods use mechanical or optical sensors attached to a glove or markers,which hinder the natural human-machine *** the other hand,vision-based methods are less restrictive and allow for a more spontaneous communication without the need of an intermediary between human and ***,vision gesture recognition has been a popular area of research for the past thirty *** gesture recognition finds its application in many areas,particularly the automotive industry where advanced automotive human-machine interface(HMI)designers are using gesture recognition to improve driver and vehicle ***,technology advances go beyond active/passive safety and into convenience and *** this context,one of America’s big three automakers has partnered with the Centre of Pattern Analysis and Machine Intelligence(CPAMI)at the University of Waterloo to investigate expanding their product segment through machine learning to provide an increased driver convenience and comfort with the particular application of hand gesture recognition for autonomous car *** present paper leverages the state-of-the-art deep learning and optimization techniques to develop a vision-based multiview dynamic hand gesture recognizer for a self-parking *** propose a 3D-CNN gesture model architecture that we train on a publicly available hand gesture *** apply transfer learning methods to fine-tune the pre-trained gesture model on custom-made data,which significantly improves the proposed system performance in a real world *** adapt the architecture of end-to-end solution to expand the state-of-the-art video classifier from a single image as input(fed by monocular camera)to a Multiview 360 feed,offered by a six cameras ***,we optimize the proposed solution to work on a

关键词： Deep Learning Video Classification Dynamic Hand Gesture Recognition Multiview Embedded Platform Automotive Vehicle Self-Parking

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