Ferromagnetism in Ga1-xMnxP: evidence for inter-Mn exchange mediated by localized holes within a detached impurity band

Journal ArticleWe report an energy gap for hole photoexcitation in ferromagnetic Ga1-xMnxP that is tunable by Mn concentration (x ≤ 0:06) and by compensation with Te donors. For x ~ 0:06, electrical transport is dominated by excitation across this gap above the Curie temperature (TC) of 60 K and by thermally activated hopping below TC. Magnetization measurements reveal a moment of 3:9 ± 0:4μB per substitutional Mn while the large anomalous Hall signal demonstrates that the ferromagnetism is carrier mediated. In aggregate these data indicate that ferromagnetic exchange is mediated by holes localized in a Mn-derived band that is detached from the valence band

Formation mechanisms of spatially-directed zincblende gallium nitride nanocrystals

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/98716/1/JApplPhys_110_124307.pd

STUDY OF THE O-18+Ni-64 TWO-NEUTRON TRANSFER REACTION AT 84 MeV BY MAGNEX

A study of the two-neutron transfer reaction of the O-18 + Ni-64 system at 84 MeV incident energy to the ground and first 2(+) excited state of the residual Ni-66 nucleus is presented. The experiment was performed at the INFN-LNS (Italy) by using the large acceptance MAGNEX spectrometer. Theoretical models are used in order to disentangle the competition between long-range and short-range correlations

Long-range versus short-range correlations in the two-neutron transfer reaction Ni 64 (O 18, O 16) Ni 66

Recently, various two-neutron transfer studies using the (18O,16O) reaction were performed with a large success. This was achieved because of a combined use of the microscopic quantum description of the reaction mechanism and of the nuclear structure. In the present work we use this methodology to study the two-neutron transfer reaction of the 18O+64Ni system at 84 MeV incident energy, to the ground and first 2+ excited state of the residual 66Ni nucleus. All the experimental data were measured by the large acceptance MAGNEX spectrometer at the Instituto Nazionale di Fisica Nucleare \u2013Laboratori Nazionali del Sud (Italy). We have performed exact finite range cross section calculations using the coupled channel Born approximation (CCBA) and coupled reaction channel (CRC) method for the sequential and direct two-neutron transfers, respectively. Moreover, this is the first time that the formalism of the microscopic interaction boson model (IBM-2) was applied to a two-neutron transfer reaction. From our results we conclude that for two-neutron transfer to the ground state of 66Ni, the direct transfer is the dominant reaction mechanism, whereas for the transfer to the first excited state of 66Ni, the sequential process dominates. A competition between long-range and short-range correlations is discussed, in particular, how the use of two different models (Shell model and IBM's) help to disentangle long- and short-range correlations

Aeromonas no processamento de queijos tipos Minas Frescal e Colonial.

Resumo: Com o objetivo de estabelecer, durante o processamento do queijo Minas Frescal e Colonial os possíveis pontos de contaminação e a forma de disseminação de bactérias do gênero Aeromonas, foram analisados, quanto à presença do micro-organismo, diferentes produtos e pontos do fluxograma de produção. Para o Queijo Minas Frescal, Aeromonas spp. foram isoladas no leite cru, leite pasteurizado, ambiente de produção e nas mãos dos manipuladores. A. caviae foi a espécie mais frequentemente identificada, sendo também isoladas A. sobria e A. schubertii. Durante o processamento do queijo Colonial, as espécies A. hydrophila, A. caviae, A. sobria, A. veronii e A. jandaei foram isoladas a partir da água, mãos dos manipuladores, utensílios, leite cru e após tratamento térmico e de massa coagulada. Os resultados demonstram que o gênero Aeromonas encontra-se disseminado nas diferentes etapas do processamento de queijos, destacando-se o leite cru como principal fonte de contaminação para o processamento industrial e artesanal. [Aeromonas in processing line of Minas Frescal and Colonial cheeses]. Abstract: The aim of this study is to establish possible contamination points and dissemination forms of the bacteria genus Aeromonas during the processing of the Brazilian cheeses Minas Frescal and Colonial. Therefore, different products and production points of the process were analyzed to determine the presence of the microorganism. In Minas Frescal cheese, Aeromonas spp. was isolated in raw and pasteurized milk, in the environment and on the handlers? hands. A. caviae was the most frequently identified species, but A. sobria and A. schubertii were also isolated. During the processing of Colonial cheese, the species A. hydrophila, A. caviae, A. sobria, A. veronii and A. jandaei were isolated in the water, raw milk, after thermal treatment and curd, as well as on the handlers' hands and utensils. The results showed that the genus Aeromonas is disseminated throughout different stages of both cheese processes while the raw milk stands out as the main source of contamination in the industrial and handmade processing

EVALUATION OF ANTIFUNGAL ACTIVITY OF ESSENTIAL OIL OF Baccharis dracunculifolia DC. AGAINST THE YEAST OF THE SPECIES Candida albicans

Os produtos oriundos de plantas medicinais com propriedades antifúngicas tem se destacado. A disponibilidade de antifúngicos atualmente utilizados na clínica é relativamente pequena, sendo muitas vezes ineficiente e com toxicidade elevada. A Candida albicans é uma levedura que está presente normalmente na microbiota humana. No entanto, quando a imunidade baixa ou após o uso de certos medicamentos, ela pode-se tornar patogênica e causar infecções ao hospedeiro. Diante deste contexto, o presente trabalho visou avaliar “in vitro” o óleo essencial de Baccharis dracunculifolia frente à cepa da espécie Candida albicans. O óleo foi extraído das folhas secas de B. dracunculifolia através do método de hidrodestilação, em aparelho de Clevenger, durante 7 horas, e apresentou  rendimento de 0,5%. O ensaio antifúngico foi realizado através do teste de difusão em disco e então testado em diferentes concentrações variando de 0,29 a 10 mg. O óleo apresentou atividade antifúngica em uma Concentração Inibitória Mínima de 10 mg. Pode-se concluir que o óleo essencial de Baccharis dracunculifolia possui boa atividade antifúngica, o que pode auxiliar no desenvolvimento de novos fármacos contra leveduras da espécie Candida albicans

Outbreak Of NDM-1-producing Klebsiella Pneumoniae In A Neonatal Unit In Colombia

Six multiresistant, NDM-1-producing Klebsiella pneumoniae strains were recovered from an outbreak that affected six neonatal patients in a Colombian hospital. Molecular analysis showed that all of the isolates harbored the blaNDM-1, qnrA, and intI1 genes and were clonally related. Multilocus sequence typing showed that the isolates belonged to a new sequence type (ST1043) that was different from the sequence types that had previously been reported. This is the first report of NDM-1-producing isolates in South America

Mechanisms of Psychological Distress following War in the Former Yugoslavia: The Role of Interpersonal Sensitivity

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.This study was funded by a grant from the European Commission, contract number INCO-CT-2004-509176. AN was supported by a Clinical Early Career Research Fellowship (113295) and a Project Grant (104288