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Search Results: 1 - 10 of 16100 matches for " Marcelo Abreu; "
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British business in Brazil: maturity and demise (1850-1950)
Abreu, Marcelo de Paiva;
Revista Brasileira de Economia , 2000, DOI: 10.1590/S0034-71402000000400001
Abstract: this paper analyses the long-term trends of ''british business'' in brazil since 1850. it covers investment and other manifestations of the british presence such as those related to trade as well as financial intermediation. primary interest is in british involvement in brazilian private sector activities, whether by direct investment or by the flotation of sterling securities for firms operating in brazil. the article also considers the role of london as a financial market where brazilian public loans were floated, the relevance of britain as a market for brazilian commodities and as a supplier to brazil, and british intermediation in brazilian trade with third countries. it is divided in chronological sections: imperial years (1850-1889); stagnation and boom (1889-1914); first signs of decline (1914-1930), and the divestment period (1930 to the mid-1950's). the final section presents the conclusions and mentions post-1950 trends.
Luto e culto cívico dos mortos: as tens?es da memória pública da Revolu??o Constitucionalista de 1932 (S?o Paulo, 1932-1937)
Abreu, Marcelo Santos de;
Revista Brasileira de História , 2011, DOI: 10.1590/S0102-01882011000100006
Abstract: the article deals with the tensions in the public memory of the constitutionalist revolution based on the analysis of the invention of the civic cult of the dead soldiers between 1932 and 1937. it seeks to understand the relationship between grief as the expression of personal loss and the civic cult of the dead, which established a political and historical meaning for the death of combatants.
Textos de apoio em saúde mental
Maciel Marcelo de Abreu
Cadernos de Saúde Pública , 2005,
Lung recruitment in ARDS: We are still confused, but on a higher PEEP level
Peter M Spieth, Marcelo Gama de Abreu
Critical Care , 2012, DOI: 10.1186/cc11177
Abstract: In this issue of Critical Care, de Matos and colleagues [1] report a case series of 51 patients with early severe acute respiratory distress syndrome (ARDS) treated with the so-called maximum recruitment strategy (MRS). The authors found sustained improved oxygenation and reduction of collapsed lung tissue, which were suggestive of high degrees of alveolar recruitability.The concept of alveolar recruitment and maintenance of high levels of positive end-expiratory pressure (PEEP) was proposed 20 years ago [2]. However, experimental as well as clinical results are still controversial and the why, how, and when of recruitment and PEEP settings are still under debate. Recent studies have questioned the concept of lung recruitability in severe ARDS in general and reported high variability of potentially recruitable lung tissue as well as an association with patient response to PEEP [3]. Although three prospective randomized clinical trials could not show decreased mortality with lung protective mechanical ventilation aiming at alveolar recruitment and the application of higher PEEP levels, better oxygenation and improvement in a relevant secondary endpoint (namely less need for rescue therapies) have been achieved [4-6]. Furthermore, a recent meta-analysis [7] suggested a survival benefit for protective mechanical ventilation at higher levels of PEEP in patients with severe ARDS. On the other hand, according to the same analysis [7], patients with less severe ARDS did not show improved survival and even needed more time to be extubated. Thus, it is crucial to define the right patient population (severe versus mild ARDS), the right time (early versus late ARDS), and the right method to achieve and maintain alveolar recruitment without causing structural damage to the lungs or compromising hemodynamics.There are numerous ways to achieve alveolar recruitment, and so far there is no gold standard to set PEEP, to recruit previously atelectatic lung regions in a standardized f
Desempenho de reator anaeróbio-aeróbio de leito fixo no tratamento de esgoto sanitário
Abreu, Sérgio Brasil;Zaiat, Marcelo;
Engenharia Sanitaria e Ambiental , 2008, DOI: 10.1590/S1413-41522008000200008
Abstract: this paper reports on the performance evaluation of an upflow anaerobic-aerobic reactor, filled with polyurethane matrices, for domestic sewage treatment. initially, different hydraulic retention times were assayed with the reactor operating exclusively in anaerobic condition. afterwards, anaerobic-aerobic combined reactor was operated. the anaerobic operation with hrt of 10 h provided the best organic matter removal with cod reduction from 389 ± 70 mg/l to 137 ± 16 mg/l. under anaerobic-aerobic condition, the cod dropped from 259 ± 69 mg/l to 93 ± 31 mg/l with hrt of 12 h (6 h in anaerobic and 6 h in aerobic stages). finally, comparing all the obtained results, it was possible to verify the importance of the aerobic post treatment in the removal of part of the organic matter not removed in an exclusively anaerobic treatment.
Duality in a fermion-like formulation for the electromagnetic field
Everton M. C. Abreu,Marcelo Hott
Physics , 1999, DOI: 10.1103/PhysRevD.62.027702
Abstract: We employ the Dirac-like equation for the gauge field proposed by Majorana to obtain an action that is symmetric under duality transformation. We also use the equivalence between duality and chiral symmetry in this fermion-like formulation to show how the Maxwell action can be seen as a mass term.
New and conventional strategies for lung recruitment in acute respiratory distress syndrome
Paolo Pelosi, Marcelo de Abreu, Patricia RM Rocco
Critical Care , 2010, DOI: 10.1186/cc8851
Abstract: Mechanical ventilation is a supportive and life saving therapy in patients with acute lung injury (ALI)/acute respiratory distress syndrome (ARDS). Despite advances in critical care, mortality remains high [1]. During the last decade, the fact that mechanical ventilation can produce morphologic and physiologic alterations in the lungs has been recognized [2]. In this context, the use of low tidal volumes (VT) and limited inspiratory plateau pressure (Pplat) has been proposed when mechanically ventilating the lungs of patients with ALI/ARDS, to prevent lung as well as distal organ injury [3]. However, the reduction in VT may result in alveolar derecruitment, cyclic opening and closing of atelectatic alveoli and distal small airways leading to ventilator-induced lung injury (VILI) if inadequate low positive end-expiratory pressure (PEEP) is applied [4]. On the other hand, high PEEP levels may be associated with excessive lung parenchyma stress and strain [5] and negative hemodynamic effects, resulting in systemic organ injury [6]. Therefore, lung recruitment maneuvers have been proposed and used to open up collapsed lung, while PEEP counteracts alveolar derecruitment due to low VT ventilation [4]. Lung recruitment and stabilization through use of PEEP are illustrated in Figure 1. Nevertheless, the beneficial effects of recruitment maneuvers in ALI/ARDS have been questioned. Although Hodgson et al. [7] showed no evidence that recruitment maneuvers reduce mortality or the duration of mechanical ventilation in patients with ALI/ARDS, such maneuvers may be useful to reverse life-threatening hypoxemia [8] and to avoid derecruitment resulting from disconnection and/or airway suctioning procedures [9].The success and/or failure of recruitment maneuvers are associated with various factors: 1) Different types of lung injury, mainly pulmonary and extra-pulmonary origin; 2) differences in the severity of lung injury; 3) the transpulmonary pressures reached during recruitment man
Proposta de índice de Qualidade para água Bruta afluente a esta??es convencionais de tratamento
Souza, Maria Eugênia Tavares Abreu de;Libanio, Marcelo;
Engenharia Sanitaria e Ambiental , 2009, DOI: 10.1590/S1413-41522009000400007
Abstract: this paper has the objective of proposing a raw water quality index (rwqi) influent for the conventional water treatment plants that allow the comparison of the treatability of distinct surface water sources. the delphi methodology was employed similarly to that employed for the development of water quality index, in the beginning of the 1970's, with a panel composed by 24 specialists. according to the panel opinion, the rwqi was composed by eight water quality parameters usually monitored in a significant portion of brazilian plants. its application on five surface water sources allows the recommendation of its use as an additional tool for the assessment of the performance of water treatment plants operated by the brazilian sanitation companies.
Transmission blocking vaccines to control insect-borne diseases: a review
Coutinho-Abreu, Iliano V;Ramalho-Ortigao, Marcelo;
Memórias do Instituto Oswaldo Cruz , 2010, DOI: 10.1590/S0074-02762010000100001
Abstract: insect-borne diseases are responsible for severe mortality and morbidity worldwide. as control of insect vector populations relies primarily on the use of insecticides, the emergence of insecticide resistance as well to unintended consequences of insecticide use pose significant challenges to their continued application. novel approaches to reduce pathogen transmission by disease vectors are been attempted, including transmission-blocking vaccines (tbvs) thought to be a feasible strategy to reduce pathogen burden in endemic areas. tbvs aim at preventing the transmission of pathogens from infected to uninfected vertebrate host by targeting molecule(s) expressed on the surface of pathogens during their developmental phase within the insect vector or by targeting molecules expressed by the vectors. for pathogen-based molecules, the majority of the tbv candidates selected as well as most of the data available regarding the effectiveness of this approach come from studies using malaria parasites. however, tbv candidates also have been identified from midgut tissues of mosquitoes and sand flies. in spite of the successes achieved in the potential application of tbvs against insect-borne diseases, many significant barriers remain. in this review, many of the tbv strategies against insect-borne pathogens and their respective ramification with regards to the immune response of the vertebrate host are discussed.
Fraturas de odontoide tipo III com necessidade de tratamento cirúrgico: estudo de série de casos e revis?o de literatura
Wieczorek, Alan Robert;Sim?es, Marcelo Simoni;Abreu, Ernani Vianna;
Coluna/Columna , 2011, DOI: 10.1590/S1808-18512011000400020
Abstract: objectives: to analyze a series of patients with unstable type iii odontoid fractures surgically treated. methods: retrospective analysis of a series of 5 consecutive cases of patients with type iii odontoid fractures, who underwent surgical treatment. results: three patients were initially treated with halo vest, and underwent surgical fixation in face of pseudarthrosis or failure of the orthosis in maintaining reduction. two patients underwent primary surgical treatment, one had marked radiological instability in flexion and spinal cord compression and other had neurological compromise. the surgical technique was individualized for each case. there were no major complications. four patients became asymptomatic and only one patient developed non-disabling neck pain. computed tomography (ct) showed fracture healing in two cases, the other 3 patients did not undergo ct scan. the mean follow-up was 1.9 years. conclusions: as type iii fractures of odontoid are not always benign, it is important to individualize their treatment whenever any unusual feature is identified. there are some criteria of instability and indications for surgical treatment for patients with this type of injury.
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