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Atomic-scale simulations of material behaviors and tribology properties for BCC metal film

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Chinese Physics B 2016年第1期25卷 412-418页

作者： H d Aristizabal P A parra P Lopez E Restrepo-parra PCM Computational Applications Universidad Nacional de Colombia-Sede ManizalesA.A.127ManizalesColombi Universidad Cató1ica de Manizales A.A.357ManizalesColombia

This work has two main purposes：（i） introducing the basic concepts of molecular dynamics analysis to material scientists and engineers, and （ii） providing a better understanding of instrumented indentation measurements, presenting an example of nanoindentation and scratch test simulations. To reach these purposes, three-dimensional molecular dynamics （Md） simulations of nanoindentation and scratch test technique were carried out for generic thin films that present BCC crystalline structures. Structures were oriented in the plane （100） and placed on FCC diamond substrates. A pair wise potential was employed to simulate the interaction between atoms of each layer and a repulsive radial potential was used to represent a spherical tip indenting the sample. Mechanical properties of this generic material were obtained by varying the indentation depth and dissociation energy. The load-unload curves and coefficient of friction were found for each test; on the other hand, dissociation energy was varied showing a better mechanical response for films that present grater dissociation energy. Structural change evolution was observed presenting vacancies and slips as the depth was varied.

关键词： molecular dynamics pair wise potential repulsive radial potential dissociation energy

Spatiotemporal mode decomposition of ultrashort pulses in linear and nonlinear graded-index multimode fibers

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Photonics Research 2023年第5期11卷 750-756页

作者： MARIO ZITELLI VINCENT COUdERC MARIO FERRARO FABIO MANGINI PEdRO parra-RIVAS YIFAN SUN STEFAN WABNITZ department of Information Engineering Electronics and TelecommunicationsUniversitàdegli Studi di Roma Sapienza00184 RomeItaly Universitéde Limoges XLIMUMR CNRS 725287060 LimogesFrance CNR-INO Istituto Nazionale di Ottica80078 PozzuoliItaly

We develop a spatiotemporal mode decomposition technique to study the spatial and temporal mode power distribution of ultrashort pulses in long spans of graded-index multimode fiber,for different input laser *** find that the beam mode power content in the dispersive pulse propagation regime can be described by the Bose-Einstein law,as a result of the process of power diffusion from linear and nonlinear mode coupling among nondegenerate mode *** the soliton regime,the output mode power distribution approaches the Rayleigh-Jeans law.

关键词： ultrashort multimode mode

Marine Metagenome as A Resource for Novel Enzymes

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Genomics, Proteomics & Bioinformatics 2015年第5期13卷 290-295页

作者： Amani d.alma'abadi Takashi Gojobori Katsuhiko Mineta Computational Bioscience Research Center (CBRC) King Abdullah University of Science and Technology (KAUST)

More than 99% of identified prokaryotes, including many from the marine environment, cannot be cultured in the laboratory. This lack of capability restricts our knowledge of microbial genetics and community ecology. Metagenomics, the culture-independent cloning of environmental dNAs that are isolated directly from an environmental sample, has already provided a wealth of information about the uncultured microbial world. It has also facilitated the discovery of novel bio- catalysts by allowing researchers to probe directly into a huge diversity of enzymes within natural microbial communities. Recent advances in these studies have led to a great interest in recruiting microbial enzymes for the development of environmentally-friendly industry. Although the metage- nomics approach has many limitations, it is expected to provide not only scientific insights but also economic benefits, especially in industry. This review highlights the importance of metagenomics in mining microbial lipases, as an example, by using high-throughput techniques. In addition, we dis- cuss challenges in the metagenomics as an important part of bioinformatics analysis in big data.

关键词： Microbial diversity Culture-independent studies Catalysis Lipase Biotechnology

Alpha2-adrenergic receptor activation reinstates motor deficits in rats recovering from cortical injury

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Neural Regeneration Research 2023年第4期18卷 875-880页

作者： Gabriela García-díaz Laura ERamos-Languren Carmen parra-Cid Joel Lomelí Sergio Montes Camilo Ríos Antonio Bueno-Nava Ignacio Valencia-Hernández Rigoberto González-Piña department of Pharmacology Section of Postgraduate Studies and ResearchHigh Medical SchoolInstituto Politécnico NacionalSalvador Díaz MirónAlcaldía Miguel HidalgoMexico CityMexico department of Neurobiology of Aging and Brain damage Coordination of Psychobiology and NeurosciencesFaculty of PsychologyNational Autonomous University of MexicoAv.Universidad 3040Col.Copilco UniversidadAlcaldía CoyoacánMexico CityMexico direction of Research National Institute of Rehabilitation LGIICalz.Mexico-Xochimilco 289Col.Arenal de GuadalupeAlcaldía TlalpanMexico CityMexico department of Pharmacology Multidisciplinary Academic Unit Reynosa-Aztlan ReynosaAutonomous University of Tamaulipascalle 16 y lago de ChapalaCol.AztlánTamaulipasMexico department of Neurochemistry National Institute of Neurology and Neurosurgery MVSAv.Insurgentes Sur 3877Col.La FamaAlcaldia TlalpanMexico CityMexico department of Special Education University of the AmericasPuebla 223Col.RomaAlcaldía CuauhtémocMexico CityMexico

Norepinephrine plays an important role in motor functional recovery after a brain injury caused by ferrous *** of norepinephrine release by clonidine is correlated with motor deficits after motor cortex *** aim of this study was to analyze the role ofα-adrenergic receptors in the restoration of motor deficits in recovering rats after brain *** rats were randomly assigned to the sham and injury groups and then treated with the following pharmacological agents at 3 hours before and 8 hours,3 days,and 20 days after ferrous chloride-induced cortical injury:saline,clonidine,efaroxan(a selective antagonist ofα-adrenergic receptors)and clonidine+*** sensorimotor score,the immunohistochemical staining forα-adrenergic receptors,and norepinephrine levels were *** hours post-injury,the sensorimotor score and norepinephrine levels in the locus coeruleus of the injured rats decreased,and these effects were maintained 3 days ***,20 days later,clonidine administration diminished norepinephrine levels in the pons compared with the sham *** effect was accompanied by sensorimotor *** effects were blocked by *** conclusion,an increase inα-adrenergic receptor levels was observed after *** restores motor deficits in rats recovering from cortical injury,an effect that was prevented by *** underlying mechanisms involve the stimulation of hypersensitiveα-adrenergic receptors and inhibition of norepinephrine activity in the locus *** results of this study suggest thatαreceptor agonists might restore deficits or impede rehabilitation in patients with brain injury,and therefore pharmacological therapies need to be prescribed cautiously to these patients.

关键词： alpha2-adrenoceptors ambulatory behavior clonidine cortical injury efaroxan functional recovery immunohistochemistry motor deficit norepinephrine sensorimotor score

Species Account of Anura ns from the Western Slope of Mt. Kita nglad, Mindanao Island, Philippines

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Asian Herpetological Research 2021年第1期12卷 76-87页

作者： Elsa May delima BARON Mark Oliver d.MARIN Benjo A.LOGRAMONTE alma B.MOHAGAN Biology Natural Sciencesand Math Division.Arts and Sciences DepartmentSan Pedro CollegeDavao City 8000MindanaoPhilippines Biology department College of Arts and SciencesCentral Mindanao UniversityMusuanBukidnon 8714MindanaoPhilipines

The Mt. Kitanglad Range is one of the country’s important key biodiversity sites;however, information about anuran diversity in this protected area remains depauperate. Herein we provided accounts of anuran species from high-elevation forests, in three sites of the western slope of Mt. Kitanglad range. The combined belt-transect sampling and microha bitat searches accounted for 13 species representing five families. The most represented family was Rhacophoridae with five representative species of the genus Philautus. Twelve out of the 13 species documented in the current survey are endemic. Four previously unaccounted species(Pelophr yne brevipes, Pulchrana grandocula, Sanguirana mearnsi, and Philautus surrufus) were added and brought the total anurans known from Mt. Kitanglad to 26 species. Most of the species were also recorded in forested sites, suggestive of their lesser affinity to non-forested ecosystems. The additional species detected during our survey may also imply that full understanding of anuran diversity of Mt. Kitanglad remains far from complete.

关键词： key biodiversity area Mindanao faunal region Philippine endemic anurans upper elevation forests wildlife inventory in Mindanao

Re-folded structure of syn-orogenic granitoids(Padrón dome, NW Iberia):Assessing rheological evolution of cooling continental crust in a collisional setting

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Geoscience Frontiers 2019年第2期10卷 651-669页

作者： Rubén díez Fernández Francisco J.Rubio Pascual Luis Miguel Martín parra departamento de Geodinámica Estratigrafía y PaleontologíaFacultad de Ciencias GeológicasUniversidad Complutense de Madrid Instituto Geológico y Minero de Espana

This contribution discusses about the rheological, kinematic and dynamic frameworks necessary to produce recumbent and upright folds from syn-orogenic granitic massifs that were formed during an early stage of magma genesis related to the onset of a migmatitic dome. Syn-kinematic granitoids occurring within the high-grade infrastructure of the Padron migmatitic dome(NW Iberia) are deformed into largescale recumbent folds(d_2) that are later affected by upright folds(d_3). Petrostructural analysis of a selected area of this dome reveals that after a period of crustal thickening(d_1), NNW-directed extensional flow gave way to recumbent folds and penetrative axial plane foliation(S_2). Superimposed subhorizontal compression resulted in upright folds(d_3). A closer view into the dynamics of the dome allows exploring the factors that may condition the nucleation of folds with contrasting geometries during progressive deformation of molten continental crust. The formation of folds affecting syn-kinematic granitoids suggests a cooling metamorphic path in migmatitic domes. Active and passive folding mechanisms require a crystallizing(cooling) magma to nucleate folds. A more competent metamorphic host inhibits fold nucleation from much less competent magmas. As it crystallizes, magma becomes more rigid(competent),and approaches viscosity values of its host. Passive folding is favored when no significant competence contrast exists between magma and host, so this folding mechanism is more likely shortly after magma genesis and emplacement. In such conditions, and under dominant subhorizontal flow accompanied by flattening(d_2),passive folding would produce isoclinal recumbent geometries. Further magma cooling introduces a shift into the rheological behavior of partially molten crust. Thereon, crystallizing magma bodies would represent significant competence contrasts relative to their host. At this point, buckling is a more likely folding mechanism, and more regular, buckle fo

关键词： Recumbent folds Migmatitic domes Partial melting Crustal-derived granitoids Orogenic collapse Variscan orogen

The role of gap junctions in cell death and neuromodulation in the retina

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Neural Regeneration Research 2021年第10期16卷 1911-1920页

作者： Gergely Szarka Marton Balogh Adam J.Tengolics alma Ganczer Bela Volgyi Tamas Kovacs-Oller Janos Szentagothai Research Centre University of PecsPecsHungary Retinal Electrical Synapses Research Group National Brain Research Program(NAP 2.0)Hungarian Academy of SciencesBudapestHungary department of Experimental Zoology and Neurobiology University of PecsPecsHungary Medical School University of PecsPecsHungary

Vision altering diseases,such as glaucoma,diabetic retinopathy,age-related macular degeneration,myopia,retinal vascular disease,traumatic brain injuries and others cripple many lives and are projected to continue to cause anguish in the foreseeable *** junctions serve as an emerging target for neuromodulation and possible regeneration as they directly connect healthy and/or diseased cells,thereby playing a crucial role in *** they are permeable for macromolecules,able to cross the cellular barriers,they show duality in illness as a cause and as a therapeutic *** this review,we take recent advancements in gap junction neuromodulation(pharmacological blockade,gene therapy,electrical and light stimulation)into account,to show the gap junction’s role in neuronal cell death and the possible routes of rescuing neuronal and glial cells in the retina succeeding illness or injury.

关键词： age-related macular degeneration bystander effect connexin diabetic retinopathy gap junction glaucoma neuromodulation retina retinal disease vision

Comparative Evaluation of the Regular Ovitrap vs an Innovated Larvitrap for <i>Aedes</i>Entomological Surveillance in Tapachula

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Advances in Entomology 2022年第1期10卷 77-84页

作者： Walter Eduardo Quezada-Yaguachi Americo d. Rodriguez[1&dagger ] Francisco Solís-Santoyo alma d. Lopez-Solis William C. Black IV Karla Saavedra-Rodriguez diego Morales-Viteri Patricia Penilla-Navarro Centro Regional de Investigación en Salud Pública Instituto Nacional de Salud Pública Tapachula Mexico Arthropod Borne and Infectious diseases Laboratory Department of Microbiology Immunology and Pathology College of Veterinary Medicine and Biomedical Sciences Colorado State University Fort Collins USA Centro de Referencia Nacional de Vectores Instituto Nacional de Investigación en Salud Pública Quito Ecuador

Objective: The objective is to compare a regular ovitrap versus an innovated larvitrap for monitoring Aedes spp. populations. Materials and Methods: A total of 20 regular ovitraps and 20 innovated larvitraps were placed in pairs in 20 houses from the 5 de Febrero neighborhood in Tapachula, Chiapas, Mexico. The innovation consisted in the incorporation of a valve in the lower part of a half tire to drain the contents in a 2 L collection container. The evaluation was carried out during five weeks, collecting eggs and larvae from the ovitraps and innovated larvitraps, respectively. Positivity indexes and insectary production of adult Aedes spp. mosquitoes were compared by collection type. Results: Average positivity index for the five weeks period were 60% for ovitraps and 91.25% for innovated larvitraps. During the five weeks, 4043 Ae. aegypti and 703 Ae. albopictus adult mosquitoes were produced in the insectary from the eggs collected from ovitraps, while from innovated larvitraps were 9014 Ae. aegypti, 1205 Ae. albopictus, and 15 Culex spp. Conclusion: Collection by the innovated larvitrap was more efficient, collecting 3.56 times more Ae. aegypti than with ovitraps, using approximately the same effort in time for replacing the filter paper from traditional 1 L ovitraps. Since the logistics for the storage and placement of larvitraps may still be a disadvantage in comparison with ovitraps, their use could be specifically intended in sentinel sites for mosquito population monitoring for entomological surveillance purposes.

关键词： Innovated Larvitrap Ovitrap Aedes Entomological Surveillance

Inhibitory Effect of N,N-dimethylhexadecylamine on the Growth of White-Rot Fungus Trametes versicolor(L.)in Wood

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Phyton-International Journal of Experimental Botany 2021年第1期90卷 193-206页

作者： Wilber Montejo-Mayo Eduardo días-Rivera Mauro Martínez-Pacheco Abril Munro-Rojas Enrique Ambriz-parra Crisanto Velázquez-Becerra Universidad Michoacana de San Nicolás de Hidalgo Facultad de Ingeniería en Tecnología de la MaderaCiudad UniversitariaMorelia58030México Instituto de Investigaciones Químico-Biológicas Universidad Michoacana de San Nicolás de HidalgoCiudad UniversitariaMorelia58030México

Wood is an organic material that is a source of carbon of organisms called Wood-decay fungi,and to preserve the wood,various toxic compounds to man and the environment have been *** analyze the effect of N,Ndimethylhexadecylamine(dMHdA)on wood attacked by the rotting fungus Trametes versicolor *** used an in vitro system to expose the fungus *** to different concentrations of the dMHdA(50,150 and 450µM).We quantified the diameter of mycelial growth and laccase activity,also,under these experimental conditions we studied morphological details of the organisms using different scanning equipment including scanning electron *** growth of *** exposed to dMHdA for 60 days,showed a concentration-dependent dose behavior,also,the electron microscopy analysis revealed that the morphology and mycelial density was affected by the dMHdA,showing a formation of atypical morphological and thickener ***,the pieces of wood treated with dMHdA and exposed to the fungus had a lower mass loss,after a period of 60 days of exposure,the values obtained were 0.7,1.0 and 0.5 g of mass lost for the control,LoC and LodMHdA treatments ***-rot fungi have represented economic losses worldwide,the strategies used have been supported by toxic compounds for the *** dMHdA both in the Petri dish system and as a wood preservative was shown to significantly inhibit the growth of ***.

关键词： Wood-decay fungi N,N-dimethylhexadecylamine wood preservative