Encontrados 214 documentos, a visualizar página 1 de 22
Self mutagens affect detrimentally PCR analysis of food fungi by creating poten...
Paterson, R. R. M.; Lima, NelsonVersão aceite em 2013 ; Analysing fungi from food by PCR is increasing rapidly. However, food fungi produce mutagens which may mutate the fungi in culture so that fungi which produce mycotoxins may have a negative PCR result for genes in the mycotoxin metabolic pathway and vice versa: It is impossible to state unequivocally that the current PCR results obtained are accurate. For example, food containing a myco...
Infecção Congénita por Citomegalovirus: a propósito de um caso clínico
M. Lima, Rosa; Pontes, Margarida; Sampaio, Virgínia; Alves, Walter; Carreira, Luísa; Gonçalves, Eduardo; Moreira, Jorge; Cunha, OctávioA infecção congénita sintomática por CMV no recém-nascido é rara. A clínica é evocadora, mas a serologia e a detecção do vírusfazem o diagnóstico definitivo.Os autores apresentam um caso de infecção sintomática por CMV em criança com prematuridade extrema que apresentouevolução clínica mais favorável em termos hematológicos e ventilatórios, após a utilização de ganciclovir, mantendo um prognósticoreservado em t...
Satellite-derived estimation of environmental suitability for malaria vector de...
Benali, Akli; Nunes, J.P.; Freitas, F.B.; Sousa, C.A.; Novo, M.T.; Lourenço, P.M.; Lima, J.C.; Seixas, J.; Almeida, A.P.G.Malaria was endemic in Europe for more than two millennia until it was eradicated in the 1970s. Recent autochthonous cases registered in Greece have increased the awareness regarding the threat of malaria re-emergence in Southern Europe. Currently, the presence of competent vectors, suitable environmental conditions and the evidences of a changing climate may increase the widespread re-emergence of malaria in S...
Distribution of 3G signals over fiber
Daniel L. Beato; António J. V. Amador; N. Martins; R. Nogueira; A. Teixeira; P. André; M. LimaIn this work we study the feasibility of UMTS (3G) transmission over Passive Optical Networks (P.O.N.). In order to achieve such objective, it was developed a simulator, so that we could correctly model the system and conclude about its impairments. The simulation results obtained validate this kind of transmission and highlight the associated limitations. ; Neste trabalho é estudada a viabilidade da tr...
All-optical routing with MZI-SOAs Switches
T. Silveira; L. Oliveira; P. Teixeira; P. André; R. Nogueira; M. Lima; P. Monteiro; A. TeixeiraA router implementation based on OCDMA header recognition and MZI-SOA switching, allowing ps range packet switching capabilities is presented in this paper. Architecture results are presented. ; A router implementation based on OCDMA header recognition and MZI-SOA switching, allowing ps range packet switching capabilities is presented in this paper. Architecture results are presented.
Remote Nodes topologies for hybrid WDM-ring TDM-tree passive optical networks
A. Baptista; M. Ferreira; A. Quintas; M. Lima; A. TeixeiraIn this paper is presented a WDM-ring TDM-tree passive optical network able to provide more than 1024 users spread over 100km with a symmetrical bandwidth of 100Mbps. A set of optically fed passive remote nodes are also presented able to provide increased efficiency and resili90ency. ; In this paper is presented a WDM-ring TDM-tree passive optical network able to provide more than 1024 users spread over 100km ...
Hybrid Communication System applying electric CDMA over optical WDM
A. Amador; A. Teixeira; M. LimaThe purpose of this work is to describe and demonstrate a new concept of a hybrid communication system, which consists of applying electrical CDMA on a system using optical WDM. Each user has a unique orthogonal CDMA code and modulates an electrical carrier (e.g. QPSK) prior to the data directly modulating an optical carrier. Thus, it is possible to add several data channels in a optical fiber, over the same or...
Crosstalk de Raman em Serviços de Vídeo sobre Redes Óticas Passivas de Próxima ...
S. Brandão; A. Shahpari; M. Lima; A. Teixeira; Neste trabalho é avaliado o impacto causado pelo efeito de Raman sobre um sistema de vídeo overlay (1550nm) na evolução rumo à próxima geração de redes de acesso óticas passivas (NG-PON2). Em primeiro lugar é estudado o impacto causado por um sinal modulado e de seguida é analisado um sistema multi- comprimento DWDM.
Biochemical mutagens affect the preservation of fungi and biodiversity estimations
Paterson, R. R. M.; Lima, NelsonMany fungi have significant industrial applications or biosafety concerns and maintaining the original characteristics is essential. The preserved fungi have to represent the situation in nature for posterity, biodiversity estimations, and taxonomic research. However, spontaneous fungal mutations and secondary metabolites affecting producing fungi are well known. There is increasing interest in the preservation...
How will climate change affect oil palm fungal diseases?
Paterson, R. R. M.; Sariah, M.; Lima, NelsonPalm oil is a very important commodity. It is added to numerous products and is a biofuel. However, oil palms (OP) are subjected to fungal diseases of which Fusarium wilt and Ganoderma rots are the most important. Considerations of how climate change (CC) affects tropical economic plants are limited and for OP are even fewer. The margin for adapting to higher temperatures and changing humidity is reduced in tro...
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