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Bactericidal activity of hydrogel beads based on N,N,N-trimethyl chitosan/alginate complexes loaded with silver nanoparticles

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Chinese Chemical Letters 2015年第9期26卷 1129-1132页

作者： Alessandro F.Martins Johny P.Monteiro Elton G.Bonaf Adriana P.Gerola Cleiser T.P.Silva Emerson M.Girotto Adley F.Rubira Edvani C.Muniz Departamento de Quimica Universidade Tecnologica Federal do Parana(UTFPR) grupo de Materials Polimericos e Compositos Universidade Estadual de Maringa(UEM)

Polysaccharide-based composite materials（beads） containing silver nanoparticles（AgNPs） were successfully *** beads acted as an efficient vehicle for Ag＊ *** promoted the AgNPs protection and inhibited their *** assays showed that the beads/AgNPs concentration can be modulated to deliver an amount of Ag＊ necessary for kill Escherichia coli cells.

关键词： N N N-Trimethyl chitosan Alginate Silver nanoparticles Antimicrobial activity Delivery

Home range variability and philopatry in Cinereous vultures(Aegypius monachus)breeding in Iberia

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Avian Research 2023年第4期14卷 586-592页

作者： Jorge García-Mací Ernesto Alvarez Manuel Galan Juan Jose Iglesias-Lebrija Marc Galvez Gerard Plana Núria Vallverdú Vicente Urios grupo de Investigacion Zoología de Vertebrados Universidad de AlicanteApdo.99E-03080AlicanteSpain GREFA(grupo de Rehabilitacion de la Fauna Autoctonay su Habitat) C/Monte del Pilar S/NE-28220MajadahondaSpain Cos d’Agents Rurals de la Generalitat de Catalunya Spain Associacio Trenca LleidaSpain

Large scavengers are strongly dependent on environmental conditions and carrion distribution and abundance,so season and breeding-related factors may influence the spatial ecology of species such as the Cinereous Vulture(Aegypius monachus),the largest European *** holds one of the biggest populations worldwide,but some aspects of the spatial ecology of the species in this region remain *** this study,17 adult Cinereous Vultures were GPS-tracked in order to study their spatial ecology during the adult *** average monthly home ranges(95%Kernel Density Estimation,KDE)and core areas(50%KDE)were 6543±19,935 km^(2)and 1174±4004 km^(2),*** average monthly home range fidelity ranged between 50 and 73%.Differences in movement-related variables between the seasonal periods(incubation,chick-rearing and non-breeding)were *** the chick-rearing period,the monthly accumulated distance was higher than during the other periods:3316±1108(chick-rearing)vs.1621±622(incubation)vs.1726±1159 km per month(nonbreeding).Additionally,large home range sizes were more frequent during the chick-rearing *** are two likely causes for these seasonal ***,chick-rearing entails a higher energetic expenditure by the parental individuals in foraging activities,so larger movements and foraging areas are expected during this ***,the flight is favoured during spring and summer due to environmental *** chick-rearing and warm months is a great evolutionary advantage for soaring-gliding raptors,as it allows them to cover larger areas with low energy ***,six individuals tagged as nestlings highlight the philopatric behaviour of the species:vultures settle their breeding areas 54±51 km from their natal nest(range=9–138 km).

关键词： Bird of prey Movement ecology Philopatry Raptor Scavenger

Three-dimensional organ modeling based on deformable surfaces applied to radio-oncology

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Journal of Zhejiang University-Science C(Computers and Electronics) 2010年第6期11卷 407-417页

作者： Gloria BUENO Oscar DéNIZ Jesús SALIDO Carmen CARRASCOSA José M. DELGADO grupo de Visióny Sistemas Inteligentes Universidad de Castilla-La Mancha E.T.S. Ingenieros Industriales Avda. Camilo José Cela 3. 13071 Ciudad Real Spain Hospital General de Ciudad Real Tomelloso s/n. 13005 Ciudad Real Spain Instituto Oncológico (grupo IMO) Modesto Lafuente 14 28010 Madrid Spain

This paper describes a method based on an energy minimizing deformable model applied to the 3D biomechanical modeling of a set of organs considered as regions of interest (ROI) for radiotherapy. The initial model consists of a quadratic surface that is deformed to the exact contour of the ROI by means of the physical properties of a mass-spring system. The exact contour of each ROI is first obtained using a geodesic active contour model. The ROI is then parameterized by the vibration modes resulting from the deformation process. Once each structure has been defined, the method provides a 3D global model including the whole set of ROIs. This model allows one to describe statistically the most significant variations among its structures. Statistical ROI variations among a set of patients or through time can be analyzed. Experimental results are presented using the pelvic zone to simulate anatomical variations among structures and its application in radiotherapy treatment planning.

关键词： 3D biomechanical organ modeling Energy minimizing deformable model Finite element model Geodesic active contour Radiotherapy treatment planning

Structure, Electronic Properties and Chemical Bonding in Bis(1H-imidazolium-κN^3)silver(Ⅰ) Nitrate from Periodic DFT Computations

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Chinese Journal of Structural Chemistry 2013年第8期32卷 1143-1152页

作者： Arvids Stashansa Soraya Jácome grupo de Fisicoquímica de Materiales Universidad Técnica Particular de Loja Escuela de Ingeniería Química Universidad Técnica Particular de Loja

Using the first-principles density functional theory calculations within the genera- lized gradient approximation we study the bis（1H-imidazolium-kN3）silver（I） nitrate molecular crystal. A number of different exchange-correlation functionals are considered for a possible treatment of the system. Perdew-Burke-Emzerhof （PBE） GGA exchange-correlation ftmctionals are found to be adequate for our system. The obtained results show that it is possible to reproduce very well the geometry of at least some molecular crystals if computational parameters are chosen adequately. In addition to the reproducing crystal structure of the bis（1H-imidazolium-kN3）silver（I） nitrate in close agreement with the available experimental data, the present work reports analysis on the chemical bonding in the material and gives total and partial density of states of this system.

关键词： crystal structure electronic properties chemicalbonding density functional theory

Soil under dead or live organic matter systems:Effect of European shag(Phalacrocorax aristotelis L.)nesting on soil nematodes and nutrient mineralization

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Soil Ecology Letters 2020年第1期2卷 40-46页

作者： Manuel Aira Jorge Dominguez grupo de Ecoloxia Animal(GEA) Facultade de CienciasUniversidad de VigoVigo E-36310Espana

Here we studied whether soil systems differ if they are under the influence of live(plants)or dead organic matter systems(nest)in terms of C and N mineralization,microbiological characteristics and nematode trophic group *** analyzed physicochemical and microbiological properties of soils inside and outside nests of the European shag(Phalacrocorax aristotelis L.)on the Cies Islands(NW Spain).We sampled fresh soil below dead(nests)and live organic matter(plants)(paired samples,n=7).Soil of nests had lower organic matter and higher electric conductivity and dissolved organic C and extractable N contents than the soil of *** biomass and activity were greater in soil of nests than in soil of *** abundance of nematode trophic groups(bacterivores,fungivores,omnivores and herbivores)differred between soils of nests and plants,and the soil of plants supported a more abundant and diverse nematode *** present results points to that source of organic matter promote differences in the decomposer community,being more efficient in soil of nests because C mineralization is ***,this occurred independently of the complexity of the systems,higher in the soil of plants with more groups of nematodes.

关键词： C and N mineralization Decomposer food web Nematode trophic structure Microbial biomass

Self-assembly of highly ordered DNA origami lattices at solid-liquid interfaces by controlling cation binding and exchange

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Nano Research 2020年第11期13卷 3142-3150页

作者： Yang Xin Salvador Martinez Rivadeneira Guido Grundmeier Mario Castro Adrian Keller Technical and Macromolecular Chemistry Paderborn UniversityPaderborn33098Germany grupo Interdisciplinar de Sistemas Complejos and Instituto de Investigación Tecnológica Universidad Pontificia Comillas de MadridMadrid28015Spain

The surface-assisted hierarchical self-assembly of DNA origami lattices represents a versatile and straightforward method for the organization of functional nanoscale objects such as proteins and ***,we demonstrate that controlling the binding and exchange of different monovalent and divalent cation species at the DNA-mica interface enables the self-assembly of highly ordered DNA origami lattices on mica *** development of lattice quality and order is quantified by a detailed topological analysis of high-speed atomic force microscopy(HS-AFM)*** find that lattice formation and quality strongly depend on the monovalent cation ***^(+)is more effective than Li^(+)and K^(+)in facilitating the assembly of high-quality DNA origami lattices,because it is replacing the divalent cations at their binding sites in the DNA backbone more *** regard to divalent cations,Ca^(2+)can be displaced more easily from the backbone phosphates than Mg^(2+)and is thus superior in guiding lattice *** independently adjusting incubation time,DNA origami concentration,and cation species,we thus obtain a highly ordered DNA origami lattice with an unprecedented normalized correlation length of *** the correlation length,we use computer vision algorithms to compute the time course of different topological observables that,overall,demonstrate that replacing MgCl_(2) by CaCl_(2) enables the synthesis of DNA origami lattices with drastically increased lattice order.

关键词： DNA origami self-assembly lattice formation high-speed atomic force microscopy topological analysis

Kinetics and mechanisms of the catalytic thermal cracking of asphaltenes adsorbed on supported nanoparticles

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Petroleum Science 2016年第3期13卷 561-571页

作者： Tatiana Montoya Blanca L.Argel Nashaat N.Nassar Camilo A.Franco Farid B.Cortés Department of Chemical and Petroleum Engineering University of Calgary 2500 University Drive NW CalgaryAB Canada grupo de Investigacion Fenomenos de Superficie-Michael Polanyi Facultad de Minas Universidad Nacional de Colombia Sede Medellin Medellin Colombia grupo de Investigacion en Yacimientos de Hidrocarburos Facultad de Minas Universidad Nacional de Colombia Sede Medellfn Kra 80 No. 65-223 Medellfn Colombia

The production of heavy and extra-heavy oil is challenging because of the rheological properties that crude oil presents due to its high asphaltene *** upgrading and recovery processes of these unconventional oils are typically water and energy intensive,which makes such processes costly and environmentally *** catalysts could be used to enhance the upgrading and recovery of heavy oil under both in situ and ex situ *** this study,the effect of the Ni-Pd nanocatalysts supported on fumed silica nanoparticles on post-adsorption catalytic thermal cracking of n-C_7 asphaltenes was investigated using a thermogravimetric analyzer coupled with *** performance of catalytic thermal cracking of n-C_7asphaltenes in the presence of NiO and PdO supported on fumed silica nanoparticles was better than on the fumed silica support *** a fixed amount of adsorbed n-C_7asphaltenes（0.2 mg/m～2）,bimetallic nanoparticles showed better catalytic behavior than monometallic nanoparticles,confirming their synergistic *** corrected OzawaFlynn-Wall equation（OFW） was used to estimate the effective activation energies of the catalytic *** mechanism function,kinetic parameters,and transition state thermodynamic functions for the thermal cracking process of n-C_7 asphaltenes in the presence and absence of nanoparticles are investigated.

关键词： Catalytic thermal cracking Adsorption Nanoparticles SHS n-C7 asphaltene

Attosecond twisted beams from high-order harmonicgeneration driven by optical vortices

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High Power Laser Science and Engineering 2017年第1期5卷 12-19页

作者： Carlos Hernandez-Garcia Laura Rego Julio San Roman Antonio Picon Luis Plaja grupo de Investigacion en Aplicaciones del Laser y Fotonica Departamento de Fisica AplicadaUniversity of SalamancaE-37008SalamancaSpain Argonne National Laboratory Argonne1L 60439USA

Optical vortices are structures of the electromagnetic field with a spiral phase ramp about a point-phase singularity,carrying orbital angular momentum(OAM). Recently, OAM has been imprinted to short-wavelength radiation through high-order harmonic generation(HHG), leading to the emission of attosecond twisted beams in the extreme-ultraviolet(XUV) regime. We explore the details of the mapping of the driving vortex to its harmonic spectrum. In particular, we show that the geometry of the harmonic vortices is convoluted, arising from the superposition of the contribution from the short and long quantum paths responsible of HHG. Finally, we show how to take advantage of transverse phase-matching to select twisted attosecond beams with different spatiotemporal properties.

关键词： attosecond science extreme-ultraviolet vortices high harmonic generation orbital angular momentum twisted beams vortexbeams

Common interacting genetic variation shapes susceptibility to type 1 diabetes in a Colombian Caribbean community:In search of shared genetic markers

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Genes & Diseases 2024年第4期11卷 106-108页

作者： Gloria Garavito-De Egea Alex Dominguez-Vargas Jorg e l.Velez Gustavo Aroca Luis Fagng Elkin Navarro-Quiroz Zilac Espitaleta Kenny Del Toro-Camargo Leticia Martinez-Ariza Tatiana Gonzalez-Vargas Susana Garcia Mauricio Arcos-Burgos Eduardo Egea Universidad del Norte Division Ciencias de la SaludBarranquillaColombia Universidad Simon Bolivar Facultad de Ciencias de la SaludBarranquillaColombia Clinica de la Costa Grupo de Investigacion en NefrologiaBarranquillaColombia Universidad de Antioquia Grupo de Investigacion en Psiquiatria(GIPSI)Departamento de PsiquiatriaInstituto de Investigaciones MedicasFacultad de MedicinaMedellinColombia

Genome-wide association studies(GWASs)have identified hundreds of loci across the human genome conferring susceptibility to autoimmune diseases(AIDs),some of which are shared between more than two ***,this univariate ... 详细信息

关键词： susceptibility diseases diabetes