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Search Results: 1 - 10 of 23097 matches for " Arist?nio Magalh?es; "
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Comparative analysis of red lists of the Brazilian flora: Asteraceae
Nakajima, Jimi Naoki;Junqueira, Talita Vieta;Freitas, Fernanda Santos;Teles, Aristnio Magalhes;
Rodriguésia , 2012, DOI: 10.1590/S2175-78602012000100004
Abstract: asteraceae is one of the most abundant families of the brazilian flora, and it stands out on brazilian red lists due to the large number of endangered and data-deficient species, since it is difficult to define a conservation status for the latter. a comparative analysis of red lists of the brazilian flora focused on the asteraceae is important, so we can assess the true degree of threat to which these plants are subjected faced with increasing environmental degradation. our analysis compared red lists, and pointed out the most threatened species or data-deficient areas, species and genera. the study was based on the first and the current official list of endangered species of the brazilian flora, and the brazilian flora red list of funda??o biodiversitas. species were organized according to the endangered and data-deficient iucn categories. endangered species were also classified according to threat category. the highest numbers of threatened species were observed in the cerrado, in the southeastern region, and in the state of minas gerais, as well as in the genera lychnophora mart., vernonia schreb., and richterago kuntze. the genera aspilia thouars, baccharis l., calea l., eupatorium l., mikania willd., piptocarpha r.br., and senecio l. have the greatest number of data-deficient species. since the current official list does not make clear its threat criteria, the red list of funda??o biodiversitas best portrays the situation of endangered asteraceae species; thus, this analysis provides important information for projects aimed at the conservation of threatened and data-deficient species.
Influência do teor de umidade no tubérculo e da quantidade de água disponível no solo s?bre a capacidade de brota??o da tiririca
Magalhes, Ant?nio Celso;
Bragantia , 1965, DOI: 10.1590/S0006-87051965000100037
Abstract: nut grass tubers showing 55, 35 and 25% of moisture were grown in soil with 100, 75, 50, 25 and 0%of available water, and the sprouting capacity was determined. tubers having 35 and 25% of water showed the best sprouting data with increasing values of available soil moisture. with 55% of humidity the highest sprouting was observed at 50% of soil moisture. in this condition at higher soil moisture contents the percentage of sprouting decreases.
Efeito da redu??o da superfície foliar s?bre o desenvolvimento de cafeeiros
Magalhes, Ant?nio Celso;
Bragantia , 1964, DOI: 10.1590/S0006-87051964000100027
Abstract: the influence of reducing 25, 50 and 75 percent of the leaf arca on the growth of the coffee plant was studied. for this purpose the area of each one of all the individual leaves of one and half year old coffee plants was reduced by cutting off part of the leaf blade in those proportions. the net assimilation rate (nar) and the relative growth rate (rgr) were determined. the reduction of the leaf area decreased the dry weight and reduced the leaf growth rate in 32.6, 42.7 and 54.0% and 6.4, 44.6 and 54,1% respectively with the cutting off of 25, 50 and 75% of leaf area. with the reduction of leaf area, the rgr decreased, while the nar increased.
Observa??es s?bre o efeito da luz no crescimento da tiririca, Cyperus rotundus L.
Magalhes, Ant?nio Celso;
Bragantia , 1967, DOI: 10.1590/S0006-87051967000100009
Abstract: the effect of shading induced by jack bean plants on the growing of nutsedge was investigated. three treatments were included: a) shading without root competition; b) shading plus competition of the root systems; c) competition of roots without shading. the control contained only nutsedge plants. of the two factors involved in the association of the species, shading proved to be the most important in determining the inhibition in the growth of nutsedge. the effect of artificial shading on the developmental pattern of the nutsedge plants was also studied. the more intense the shade, the greater the decreasing in the growth rate of the nutsedge plants. under conditions of 92.5% of shading the growth was inhibited in about 60% when compared with the control plants. the compensation point of light, determined colorimetrically, showed that the point of equilibrium between the photosynthetic and respiratory processes was attained in the range of 800 to 1,000 lux of light intensities. by considering that a 2.5-months-old jack bean culture only allows 1 to 1.5% of the incident light to reach the soil surface, it can be assumed that the infestation of nutsedge should be lowered by the shading effect induced by the jack bean plants.
A Identidade do Ensino Superior: a Educa??o Superior e a Universidade
Magalhes,António M.;
Revista Lusófona de Educa??o , 2006,
Abstract: higher education is a product of modernity, built in the crossroad of the humboldtian model, the napoleonic model and the oxbridge model. higher education, as we know it, was centred in the handling of knowledge, i.e., in its production (research) in its distribution (teaching) and in its dissemination across society (service to community). knowledge and its handling defined not only the institutional mission, but also the nature of higher education organizations. to these components of the ?idea? of higher education, others equally important elements were added: the role of higher education institutions in the consolidation and development of the nation-state. the cadres necessary to the functioning of the state apparatus found in the universities a privileged place for their training. this paper argues that in a context in which the production, distribution and dissemination of knowledge are changing, a context in which globalization/localization processes erode - mainly in europe - the national level, and a context in which massification and democratization of access to higher education induce sociological patterns different from the originals, higher education itself is assuming a schizo identity: tertiary education, post-secondary education, research-driven higher education, vocational higher education, etc. this situation demands increased reflexivity, by simultaneously refusing an essentialist approach to the ?idea? to higher education and stressing the need to promote educational perspectives not reducible to its adaptability, i.e., refusing the framework of a paradigm in which the criterion of an institution legitimacy is proportional to their survival capacity in an ever changing environment
High-altitude hypoxia. A challenging strain targeting cellular redox homeostasis
Magalhes,José; Ascens?o,António;
Revista Portuguesa de Ciências do Desporto , 2008,
Abstract: after putting forward some evidence of hypobaric hypoxia as a particular stimulus causing systemic, tissue and cellular challenging strains, the present short review is focused on the current findings relating the reasoning of increased tissue generation of reactive oxygen and nitrogen species (rons) when humans and animals organisms are exposed to high-altitude environments. in contrast to earlier concepts, hypobaric hypoxia-induced decreased physiological oxygen availability seems to be a prompt condition to cellular loss of redox homeostasis resulting in increased oxidative stress, which does not further augment upon reoxygenation. the apparently paradoxical condition of hypoxia-induced free radical production is regulated by very particular and specific cellular mechanisms, being mitochondria special sources and targets of rons as well as critical organelles related to cellular death mediated by apoptosis.
O conceito de stakeholder e o novo paradigma do ensino superior
Alberto Amaral,António Magalhes
Revista Portuguesa de Educa??o , 2000,
Abstract: The meaning of the concept of stakeholder in university governance is examined from a theoretical point of view, and a preliminary analysis of its implementation and effects is made using examples from some European countries as well as from Portugal. The authors find that so far the presence of stakeholders in the governing bodies of universities has been less effective than it could be foreseen, but as the consequences of their presence can be negative for universities it is concluded that the process should be carefully monitored while a more complete analysis is made.
Educa??o, conhecimento e a sociedade em rede
Stoer, Stephen R;Magalhes, António M;
Educa??o & Sociedade , 2003, DOI: 10.1590/S0101-73302003000400005
Abstract: in this article, we centre our attention on the 'development of individual capacities' in an attempt to map out the effects of the simultaneous pressure, top-down and bottom-up, that has been increasingly brought to bear on the nation-state and on the education system. with regard to the first, it is argued (cf. bernstein, 1996) that what is at stake is the transformation of knowledge itself into money (i.e., pure performance); while with regard to the second, there appears to be taking place a movement of knowledge from the school (national level) to the local community in which this latter is interpreted as the 'educative city' (where a 'transparent' communicational pedagogy holds sway). this work aims at challenging the dichotomy constructed by way of an analysis of the implications, for both pedagogy and the development of individual capacities, of the development and consolidation of a network state and society (castells, 1996).
O uso da estatística de qui-quadrado no controle de processos
Costa, Ant?nio Fernando Branco;Magalhes, Maysa Sacramento de;
Gest?o & Produ??o , 2005, DOI: 10.1590/S0104-530X2005000200010
Abstract: it is standard practice to use joint charts in process control, one designed to detect shifts in the mean and the other to detect changes in the variance of the process. in this paper, we propose the use of a single chart to control both mean and variance. based on the noncentral chi square statistic, the single chart is faster in detecting shifts in the mean and increases in variance than its competitor, the joint "xbar" and r charts. the noncentral chi square statistic can also be used with the ewma procedure, particularly in the detection of small mean shifts, accompanied or not by slight increases in variance.
"Católico, de cora??o!" Um Wild Geese no Santo Ofício de Lisboa
Magalhes, Pablo Ant?nio Iglesias;Gabrielli, Cassiana Maria Mingotti;
História (S?o Paulo) , 2011, DOI: 10.1590/S0101-90742011000200014
Abstract: this article investigates the inquisitorial process of the irish catholic, robert walters, who, after serving the english at saint christopher island in the caribbean, presented himself to the santo oficio of lisbon in 1631. the youth, later to fight against the dutch in brazil, reflected on his chosen path with all the inherent contradictions concerning the religious feelings of his time, subjugated to the objectives of the national and mercantile politics of the modern era.
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