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Jaqueline López-Ochoa,J. Fernando Montes-García,Candelario Vázquez,Patricia Sánchez-Alonso,Victor M. Pérez-Márquez,Patrick J. Blackall,Sergio Vaca,Erasmo Negrete-Abascal 한국미생물학회 2017 The journal of microbiology Vol.55 No.9
Gallibacterium, which is a bacterial pathogen in chickens, can form biofilms. Amyloid proteins present in biofilms bind Congo red dye. The aim of this study was to characterize the cell-surface amyloid-like protein expressed in biofilms formed by Gallibacterium strains and determine the relationship between this protein and curli, which is an amyloid protein that is commonly expressed by members of the Enterobacteriaceae family. The presence of amyloid-like proteins in outer membrane protein samples from three strains of G. anatis and one strain of Gallibacterium genomospecies 2 was evaluated. A protein identified as elongation factor-Tu (EF-Tu) by mass spectrometric analysis and in silico analysis was obtained from the G. anatis strain F149T. This protein bound Congo red dye, cross-reacted with anti-curli polyclonal serum, exhibited polymerizing properties and was present in biofilms. This protein also reacted with pooled serum from chickens that were experimentally infected with G. anatis, indicating the in vivo immunogenicity of this protein. The recombinant EF-Tu purified protein, which was prepared from G. anatis 12656-12, polymerizes under in vitro conditions, forms filaments and interacts with fibronectin and fibrinogen, all of which suggest that this protein functions as an adhesin. In summary, EF-Tu from G. anatis presents amyloid characteristics, is present in biofilms and could be relevant for the pathogenesis of G. anatis.
On the Densification Kinetics of Metallic Powders Under Hot Uniaxial Pressing
J. M. Montes,F. G. Cuevas,J. Cintas,F. Ternero,E. S. Caballero 대한금속·재료학회 2019 METALS AND MATERIALS International Vol.25 No.3
A new model undertaking the densification kinetics of uniaxially pressed metallic powders at constant temperature is proposed. This model is developed according to the power law of creep, and the expression of the ‘net pressure’ derived by theauthors in a previous work. This net pressure describes the ‘geometrical hardening’ experienced by the powder mass, duringcompression. In order to validated the model three different powders were uniaxially pressed, aluminium, tin and lead, beingobtained data from hot compaction experiments. The similarity between the model predicted curves and the experimentaldata is quite acceptable. In addition, the goodness of the model is contrasted with two other theoretical models addressing thesame problem. The approach developed can be useful to model hot uniaxial pressing and electrical consolidation processes,which start with loose powders, i.e., not previously cold compacted powders.
Modelling and Simulation of the Electrical Resistance Sintering Process of Iron Powders
J. M. Montes,F. G. Cuevas,F. J. V. Reina,F. Ternero,R. Astacio,E. S. Caballero,J. Cintas 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.7
In this paper, the process known as Electrical Resistance Sintering under Pressure is modelled, simulated and validated. Thisconsolidation technique consists of applying a high-intensity electrical current to a metallic powder mass under compression. The Joule effect acts heating and softening the powders at the time that pressure deforms and makes the powder mass todensify. The proposed model is numerically solved by the finite elements method, taking into account the electrical–thermal–mechanical coupling present in the process. The theoretical predictions are validated with data recorded by sensorsinstalled in the electrical resistance sintering equipment during experiments with iron powders. The reasonable agreementbetween the theoretical and experimental curves regarding the overall porosity and electrical resistance suggests that themodel reproduces the main characteristics of the process. Also, metallographic studies on porosity distribution confirm themodel theoretical predictions. Once confirmed the model and simulator efficiency, the evolution of the temperature and theporosity fields in the powder mass and in the rest of elements of the system can be predicted. The influences of the processingparameters (intensity, time and pressure) as well as the die material are also analyzed and discussed.
Behavior of subthreshold conduction in junctionless transistors
Park, S.J.,Jeon, D.Y.,Montes, L.,Mouis, M.,Barraud, S.,Kim, G.T.,Ghibaudo, G. Pergamon Press ; Elsevier Science Ltd 2016 Solid-state electronics Vol.124 No.-
In this work, the effect of high channel doping concentration and unique structure of junctionless transistors (JLTs) is investigated in the subthreshold conduction regime. Both experimental results and simulation work show that JLTs have reduced portion of the diffusion conduction and lower effective barrier height between source/drain and the silicon channel in subthreshold regime, compared to conventional inversion-mode (IM) transistors. Finally, it leads to a relatively large DIBL value in JLTs, owing to degraded gate controllability on channel region and strong drain bias effect. However, JLTs showed a better immunity against short channel effect in terms of degradation of the effective barrier height value.
Optical Properties of a Quantum Dot-Ring System Grown Using Droplet Epitaxy
Linares-Garcí,a, Gabriel,Meza-Montes, Lilia,Stinaff, Eric,Alsolamy, S. M.,Ware, M. E.,Mazur, Y. I.,Wang, Z. M.,Lee, Jihoon,Salamo, G. J. Springer US 2016 NANOSCALE RESEARCH LETTERS Vol.11 No.1
<P>Electronic and optical properties of InAs/GaAs nanostructures grown by the droplet epitaxy method are studied. Carrier states were determined by <B>k</B><B>·</B><B>p</B> theory including effects of strain and In gradient concentration for a model geometry. Wavefunctions are highly localized in the dots. Coulomb and exchange interactions are studied and we found the system is in the strong confinement regime. Microphotoluminescence spectra and lifetimes were calculated and compared with measurements performed on a set of quantum rings in a single sample. Some features of spectra are in good agreement.</P><P><B>Electronic supplementary material</B></P><P>The online version of this article (doi:10.1186/s11671-016-1518-2) contains supplementary material, which is available to authorized users.</P>