Encontrados 9 documentos, a visualizar página 1 de 1
Transcriptionally active heterochromatin in rye B chromosomes
Carchilan, Mariana; Delgado, Margarida; Ribeiro, Teresa; Nunes, Pedro Costa; Caperta, A.; Morais-Cecílio, L.; Jones, R. Neil; Viegas, WandaB chromosomes (Bs) are dispensable components of the genomes of numerous species. Thus far, there is a lack of evidence for any transcripts of Bs in plants, with the exception of some rDNA sequences. Here, we show that the Giemsa bandingpositive heterochromatic subterminal domain of rye (Secale cereale) Bs undergoes decondensation during interphase. Contrary to the heterochromatic regions of A chromosomes, this...
Ab initio study of CsI and its surface
Ribeiro, R. M.; Coutinho, J.; Torres, V. J. B.; Jones, R.; Sque, S. J.; Oberg, S.; Shaw, M. J.; Briddon, P. R.Prova tipográfica (In Press) ; Cesium iodide properties, both in the bulk and on (110) and (100) surfaces, are studied using Density Functional Theory. The bulk lattice constant, bulk modulus and elastic constants are in good agreement with the experimental values. The electronic band structure is also calculated, as well as the density of states. On the surfaces, relaxation of the atoms was performed, and the...
Cochicine-induced polyploidization depends on tubulin polymerization in c-metap...
Caperta, A.; Delgado, M.; Ressurreição, F.; Meister, A.; Jones, R.N.; Viegas, W.; Houben, A.The microtubule cytoskeleton plays a crucial role in the cell cycle and in mitosis. Colchicine is a microtubule-depolymerizing agent that has long been used to induce chromosome individualization in cells arrested at metaphase and also in the induction of polyploid plants. Although attempts have been made to explain the processes and mechanisms underlying polyploidy induction, the role of the cytoskeleton still...
Ab initio study of CsI
Ribeiro, R. M.; Eberlein, T. A. G.; Jones, R.; Oberg, S.; Briddon, P. R.; Sque, S. J.; Coutinho, J.; Torres, V. J. B.O Iodeto de Cesio é um material muito usado em detectores de raios X e em outros detectores de particulas de alta energia, usados em particular no CERN (experiencia ALICE). No entanto, apesar do seu uso intensivo, pouco se sabe das propriedades electrónicas do CsI, do que o torna um tão bom cintilador (emitindo em comprimentos de onda relevantes para o silício), qual o mecanismo de degradação, e o que se pode ...
Different numbers of rye B chromosomes induce identical compaction changes in d...
Delgado, M.; Caperta, A.; Ribeiro, T.; Viegas, W.; Jones, R.N.; Morais-Cecilio, L.In rye each B chromosome (B) represents 5.5% of the diploid A genome. Rye Bs have several nuclear to whole plant effects although they seem to bear no genes except for the ones that lead to their maintenance within a population. In this context, and considering that rye Bs are enriched in repetitive non-coding regions that build up heterochromatin (het), we investigated the influence of Bs on the organization o...
Hadron energy reconstruction for the ATLAS calorimetry in the framework of the ...
Akhmadaliev, S.; Amaral, P.; Ambrosini, G.; Amorim, A.; Anderson, K.; Andrieux, M. L.; Aubert, B.; Augé, E.; Badaud, F.; Baisin, L.; Barreiro, F.This paper discusses hadron energy reconstruction for the ATLAS barrel prototype combined calorimeter (consisting of a lead-liquid argon electromagnetic part and an iron-scintillator hadronic part) in the framework of the non-parametrical method. The non-parametrical method utilizes only the known e/h ratios and the electron calibration constants and does not require the determination of any parameters by a min...
Results from a new combined test of an electromagnetic liquid argon calorimeter...
Akhmadaliev, S.; Albiol, F.; Amaral, P.; Ambrosini, G.; Amorim, A.; Anderson, K.; Andrieux, M. L.; Aubert, B.; Augé, E.; Badaud, F.; Baisin, L.A new combined test of an electromagnetic liquid argon accordion calorimeter and a hadronic scintillating-tile calorimeter was carried out at the CERN SPS. These devices are prototypes of the barrel calorimeter of the future ATLAS experiment at the LHC. The energy resolution of pions in the energy range from 10 to 300 GeV at an incident angle [theta] of about 12° is well described by the expression , where E is...
Avaliação da atividade in vitro dos novos antimicrobianos da classe das fluoroq...
Gales,A.C.; Pignatari,A.C.; Jones,R.N.; Baretta,M.; Sader,H.S.OBJETIVO. A proposta deste estudo foi a avaliação da atividade in vitro de novos antimicrobianos da classe das fluoroquinolonas, das cefalosporinas e dos carbapenens contra bactérias gram-negativas. MATERIAL E MÉTODO. Foram avaliadas 569 amostras clínicas isoladas no Hospital São Paulo - UNIFESP/EPM, no período compreendido entre junho e julho de 1992. A distribuição das espécies foi: Enterobacter sp. (62), Esc...
Avaliação da sensibilidade a antimicrobianos de 87 amostras clínicas de enteroc...
Saraiva,I.H.; Jones,R.N.; Erwin,M.; Sader,H.S.OBJETIVOS. 1) Avaliar o padrão de sensibilidade in vitro de amostras clínicas de enterococos resistentes à vancomicina (ERV), aos antimicrobianos comumente utilizados no seu tratamento, bem como a antimicrobianos alternativos. 2) Avaliar a acurácia do E test, em comparação aos outros testes de sensibilidade a antimicrobianos (microdiluição em caldo e difusão em disco). MATERIAL E MÉTODOS. Foram analisadas 87 am...
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