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Antioxidative study of Cerium Oxide nanoparticle functionalised pCL-Gelatin electrospun fibers for wound healing application

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Bioactive materials 2018年第2期3卷 201-211页

作者： Hilal Ahmad Rather ria Thakore Ragini Singh Dhwani Jhala Sanjay Singh Rajesh Vasita Biomaterials&Biomimetics Laboratory School of Life SciencesCentral University of GujaratGandhinagar382030GujaratIndia Division of Biological and Life Sciences School of Arts and ScienceAhmedabad UniversityNavrangpuraAhmedabad380009GujaratIndia

Skin wound healing involves a coordinated cellular response to achieve complete *** levels of reactive oxygen species(ROS)in the wound environment often pose a hindrance in wound healing resulting in impaired wound healing *** oxide nanoparticles(CeNps)have the ability to protect the cells from oxidative damage by actively scavenging the ***,matrices like nanofibers have also been explored for enhancing wound *** the current study CeNp functionalised polycaprolactone(pCL)-gelatin nanofiber(pGNpNF)mesh was fabricated by electrospinning and evaluated for its antioxidative *** angle XRD analysis of randomly oriented nanofibers revealed^2.6 times reduced crystallinity than pristine pCL which aided in rapid degradation of nanofibers and release of ***,bioactive composite made between nanoparticles and pCLgelatin maintained the fibrous morphology of pGNpNF upto 14 *** pGNpNF mesh exhibited a superoxide dismutase(SOD)mimetic activity due to the incorporated *** pGNpNF mesh enhanced proliferation of 3T3-L1 cells by^48%as confirmed by alamar blue assay and SEM micrographs of cells grown on the nanofibrous ***,the pGNpNF mesh scavenged ROS,which was measured by relative DCF intensity and fluorescence microscopy;and subsequently increased the viability and proliferation of cells by three folds as it alleviated the oxidative ***,the results of this study suggest the potential of CeNp functionalised pCL-gelatin nanofibrous mesh for wound healing applications.

关键词： Electrospinning Ce nanoparticles Antioxidative Nanofiber

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Analysis of Compression Resistance and Oil Adsorption Capacity of Cellulose/NaOH Cryogels

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Journal of Renewable materials 2019年第3期7卷 227-234页

作者： Lídia K.Lazzari Vitória B.Zampieri Ademir J.Zattera Camila Baldasso Center for Exact Sciences and Technologies-University of Caxias do Sul.1130 Francisco Getúlio Vargas Street Caxias do Sul95070-560Brazil

This work aimed at analyzing the petroleum adsorption capacity and the compressive strength of cellulose cryogels produced with the addition of 4 and 8%(w/w)sodium hydroxide(NaOH).Cryogels were produced from a 1.5%(m/m)suspension of cellulose microfibers,which originated from pinus elliotti,in distilled *** addition of NaOH increased the compression strength of cryogel by 30% when compared to cryogel without the *** to the 50% decrease in volume,the cryogel FLNB-8h(8%NaOH)has its petroleum adsorption capacity decreased in average by 58%,whereas the FLNB-4(4%NaOH)cryogel had it only by 14%.The cellulose suspension which provided the best results for the properties of the cryogels tested had a 4%concentration of NaOH.

关键词： Cryogel cellulose NaOH adsorption compression resistance

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preparation and Compaction Behaviour of poly(methyl methacrylate) Coated Iron Microparticles

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Journal of materials Science & Technology 2010年第5期26卷 454-460页

作者： Daniela Kladeková Renáta Orináková Annamária Krajníková Miriam Kupková margita Kabátová Kveta markuová Institute of Chemistry Faculty of ScienceP.J.afárik University in Koice Institute of materials Research of the Slovak Academy of Sciences in Koice

The poly（methyl methacrylate）（pMma） coatings onto surface of iron particles were electrochemically prepared and the effect on both surface structure and internal structure of the resulted material after compaction was carried *** electrochemical polymerization treatment was performed in a fluidized bed electrolyzer using sulphuric acid solution containing potassium persulphate and methyl methacrylate（Mma）.The surface topography and the microstructure of the samples were observed by scanning electron microscopy（SEM） and optical microscopy（OM）.It was found that the pMma layer coated onto iron particles results in improvement of their compressibility compared with uncoated powders,and classical lubricants are not necessary for compacting particles coated.

关键词： Cathodic electropolymerization poly(methyl methacrylate) coating Surface appearance Microstructure Compaction process

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The potential application of red mud and soil mixture as additive to the surface layer of a landfill cover system

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Journal of Environmental Sciences 2016年第6期28卷 189-196页

作者： Eva Ujaczki Viktória Feigl Mónika Molnár Emese Vaszita Nikolett Uzinger Attila Erdélyi Katalin Gruiz Department of Applied Biotechnology and Food Science Faculty of Chemical Technology and Biotechnology Budapest University of Technology and Economics H-1111 Budapest Muegyetem rkp. 3 Hungar Institute for Soil Sciences and Agricultural Chemistry Centre for Agricultural Research Hungarian Academy of Sciences H-1022 Budapest Herman Otto Street 15 Hungary A.S.A. Hungary Ltd. H-2360 Gydl Karosi Street 53 Hungary

Red mud, the by-product of aluminum production, has been regarded as a problematic residue all over the world. Its storage involves risks as evidenced by the Ajka red mud spill,an accident in Hungary where the slurry broke free, flooding the surrounding areas. As an immediate remediation measure more than 5 cm thick red mud layer was removed from the flooded soil surface. The removed red mud and soil mixture（RMSM） was transferred into the reservoirs for storage. In this paper the application of RMSM is evaluated in a field study aiming at re-utilizing waste, decreasing cost of waste disposal and providing a value-added product. The purpose was to investigate the applicability of RMSM as surface layer component of landfill cover systems. The field study was carried out in two steps： in lysimeters and in field plots. The RMSM was mixed at ratios ranging between 0 and 50% w/w with low quality subsoil（LQS） originally used as surface layer of an interim landfill cover. The characteristics of the LQS ＋ RMSM mixtures compared to the subsoil（LQS） and the RMSM were determined by physical–chemical, biological and ecotoxicological methods. The addition of RMSM to the subsoil（LQS） at up to 20% did not result any ecotoxic effect, but it increased the water holding capacity. In addition, the microbial substrate utilization became about triple of subsoil（LQS） after 10 months. According to our results the RMSM mixed into subsoil（LQS） at20% w/w dose may be applied as surface layer of landfill cover systems.

关键词： Red mud Soil amelioration Environmental toxicology Landfill cover constituent Field-study Lysimeter

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Climate Change Impacts on Environmental Hazards on the Great Hungarian plain, Carpathian Basin

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International Journal of Disaster Risk Science 2014年第2期5卷 136-146页

作者： Gábor Mezosi Teodóra Bata Burghard C.Meyer Viktória Blanka Zsuzsanna Ladányi Department of physical Geography and Geoinformatics University of SzegedEgyetem u.2-6Szeged 6722Hungary

The potential impacts of climate change on the Great Hungarian plain based on two regional climate models,REMO and ALADIN,were analyzed using indicators for environmental *** the climate parameters(temperature,precipitation,and wind)will change in the two investigated periods(2021–2050 and 2071–2100),their influences on drought,wind erosion,and inland excess water hazards are modeled by simple predictive *** hazards on arable lands will increasingly affect the productivity of agriculture compared to the reference period(1961–1990).The models predict an increase between 12.3%(REMO)and 20%(ALADIN)in the first period,and between 35.6%(REMO)and 45.2%(ALADIN)in the second *** increase of wind erosion hazards is not as obvious(+15%for the first period in the REMO model).Inland excess water hazards are expected to be slightly reduced(-4 to 0%)by both model predictions in the two periods without showing a clear tendency on *** three indicators together give a first regional picture of potential hazards of climate *** predictive model and data combinations of the regional climate change models and the hazard assessment models provide insights into regional and subregional impacts of climate change and will be useful in planning and land management activities.

关键词： Great inland drought

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跨年夜突装

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财新周刊 2023年第2期 12-13页

作者： ria Novosti(图) 无不详视觉中国

当地时间2023年1月2日,顿涅茨克地区,俄罗斯紧急救援人员清除被炮击摧毁的废墟。俄罗斯国防部称,跨年夜期间,乌克兰武装力量对顿涅茨克马克耶夫卡地区的俄罗斯军人临时部署点进行了打击,截至1月4日,造成的死亡人数已上升至89人。俄军方... 详细信息

当地时间2023年1月2日,顿涅茨克地区,俄罗斯紧急救援人员清除被炮击摧毁的废墟。俄罗斯国防部称,跨年夜期间,乌克兰武装力量对顿涅茨克马克耶夫卡地区的俄罗斯军人临时部署点进行了打击,截至1月4日,造成的死亡人数已上升至89人。俄军方称,事后俄军对乌方进行了反击,摧毁乌方大量武器装备,并打死300余名乌军和外国雇佣兵。俄军方还称,调查显示,有土兵违反禁令违规使用手机,造成部署点地点泄露,将对相关负责人进行处罚。乌克兰武装部队总参谋部2日证实乌军对顿涅茨克地区马克耶夫卡的俄军进行了打击。乌克兰军方表示,马克耶夫卡袭击所导致的俄军死亡人数要比俄方公布的更高,约有400人死亡。

关键词：死亡人数顿涅茨克紧急救援打击俄军禁令乌克兰武器装备

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Estimation of endogenous protein and amino acid ileal losses in weaned piglets by regression analysis using diets with graded levels of casein

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Journal of Animal Science and Biotechnology 2014年第1期5卷 74-79页

作者： Tércia Cesária Reis de Souza Araceli Aguilera Barreyro Gerardo mariscal-Landín Facultad de Ciencias Naturales Universidad Autónoma de QuerétaroSantiago de Querétaro Av. De las Ciencias s/n Juriquilla 76000 QuerétaroQuerétaro México Centro Nacional de Investigación en Fisiología Animal Instituto Nacional de Investigaciones Forestales Agrícolas y Pecuarias Km 1Carretera a Colón Ajuchitlán Colón Querétaro 76280 México

Background： many studies have investigated endogenous loss of proteins and amino acids （AAs） at the ileal level in growing pigs. However, only a few studies have researched this subject in piglets. Knowledge regarding AA ileal digestibility in piglets would be helpful during the formulation of diets for weaning piglets, rather than just using coefficients obtained in growing pigs. Therefore, in this study, we sought to estimate endogenous protein and AA ileal losses in piglets. Furthermore, apparent and true ileal digestibility （AID and TID） of protein and AAs from casein were measured. Results： The average flow of protein was 20.8 g/kg of dry matter intake （DMI）. Basal protein loss, as estimated by regression, was 16.9 g/kg DMI. Glutamic acid, arginine, and aspartic acid （2.2, 1.4, and 1.2 g/kg DMI, respectively） were the AAs for which greater losses were seen. The AID of protein and AAs increased as the protein level in the diet increased. A higher increment in AID was observed between diets with 80 and160 g Cp/kg of feed; this finding was mainly attributable to increases in glycine and arginine （46.1% and 18%, respectively）. The TID of protein was 97.8, and the TID of AAs varied from 93.9 for histidine to 100.2 for phenylalanine. Conclusions： The basal endogenous protein loss in piglets was 16.9 g/kg DMI. Endogenous protein was rich in glutamic acid, aspartic acid, and arginine, which represented 32.7% of endogenous protein loss in weaning piglets. The TID of casein was high and varied from 93.0 for histidine to 100.2 for phenylalanine.

关键词： Amino acid loss Ileal digestibility protein loss Weaned piglets

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IMEX Large Time Step Finite Volume Methods for Low Froude Number Shallow Water Flows

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Communications in Computational physics 2014年第7期16卷 307-347页

作者： Georgij Bispen K.R.Arun Mária Lukácová-Medvid’ová Sebastian Noelle Institute of mathematics University of MainzGermany School of mathematics Indian Institute of Science Education and Research ThiruvananthapuramIndia IGpM RWTH AachenGermany.

We present new large time step methods for the shallow water flows in the lowFroude number *** order to take into accountmultiscale phenomena that typically appear in geophysical flows nonlinear fluxes are split into a linear part governing the gravitational waves and the nonlinear *** propose to approximate fast linear waves implicitly in time and in space bymeans of a genuinely multidimensional evolution *** the other hand,we approximate nonlinear advection part explicitly in time and in space bymeans of themethod of characteristics or some standard numerical flux *** integration is realized by the implicit-explicit(IMEX)*** apply the IMEX Euler scheme,two step Runge Kutta Cranck Nicolson scheme,as well as the semi-implicit BDF scheme and prove their asymptotic preserving property in the low Froude number *** experiments demonstrate stability,accuracy and robustness of these new large time step finite volume schemes with respect to small Froude number.

关键词： LowFroude number flows asymptotic preserving schemes shallowwater equations large time step semi-implicit approximation evolution Galerkin schemes

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Corrosion and mechanical properties of a novel biomedical WN43magnesium alloy prepared by spark plasma sintering

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Journal of magnesium and Alloys 2021年第3期9卷 853-865页

作者： Michal Knapek Mária Zemková Adam Gres Eva Jablonská Frantisek Lukác Robert Král Jan Bohlen peter Minárik Charles University Faculty of Mathematics and PhysicsKe Karlovu 512116 PragueCzech Republic Nuclear physics Institute of CAS Řež13025068ŘežCzech Republic University of Chemistry and Technology Department of Biochemistry and MicrobiologyTechnická5Prague16628 PragueCzech Republic Institute of plasma physics of CAS Za Slovankou 318200 PragueCzech Republic Helmholtz-Zentrum Geesthacht Magnesium Innovation Centre(MagIC)D21502 GeesthachtGermany

Alloying of Mg with rare-earth(RE)elements proved to be beneficial for their in-vitro and in-vivo *** this work,a novel WN43(Mg-4 wt%Y-3 wt%Nd)alloy with a well-defined composition was prepared,where,unlike in the commercial WE43 alloy,the possibly harmful RE mischmetal was substituted by less toxic Nd.A modern spark plasma sintering(SpS)technique was used to effectively produce WN43 samples from atomized *** temperatures of 400℃-550℃ and holding times of 3 or 10 min were used and wellcompacted final materials were successfully *** was shown that a superior combination of corrosion and mechanical properties was attained in the samples sintered at 500℃ and 550℃,while the effect of sintering time was rather *** performance of this material was exceptional within the group of Mg alloys prepared by powder metallurgy and comparable with conventionally prepared ***,it was shown that a great variety of mechanical and corrosion characteristics can be obtained by altering the SpS parameters so as to fulfill case-specific requirements typical of biomedical ***,the novel WN43 alloy prepared by SpS seems to be a particularly suitable material for biomedical use.

关键词： magnesium Biocompatibility powder Sintering Corrosion Rare earth element

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Role of microfluctuations in accommodation: a novel approach to reduce non-accommodative noise

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International Journal of Ophthalmology(English edition) 2019年第4期12卷 681-684页

作者： Núria Lupón Joan Gispets Genis Cardona Alba Tàpia Hector Abril Department of Optics and Optometry Universitat Politècnica de Catalunya Applied Optics and Image processing Research Group Universitat Politècnica de Catalunya

Accommodative response and its possible role in myopia development has been explored through the study of the microfluctuations(MFs) of accommodation, which are commonly divided in high(1.0 to 2.3 Hz) and low(0.1 to 0.6 Hz) frequency components. previous research efforts have evidenced that a certain percentage of the amplitude of MFs seems not to originate in the accommodative response. We aimed to develop and test a new approach to reduce this non-accommodative noise. For this purpose, ten healthy participants were enrolled to determine the difference between the amplitude of MFs at near and distance for each range of frequencies, which was defined as the relative amplitude of MFs. The findings support the exploration of the relative rather than absolute values of the amplitude of MFs to better understand the contribution of both accommodative and non-accommodative factors to MFs.

关键词： accommodation cycloplegia microfluctuations myopia photorefraction

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