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Search Results: 1 - 10 of 4002 matches for " Pola Alessandra; Narvai "
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Aspectos éticos do uso de produtos fluorados no Brasil: uma vis?o dos formuladores de políticas públicas de saúde
Kalamatianos,Pola Alessandra; Narvai,Paulo Capel;
Ciência & Saúde Coletiva , 2006, DOI: 10.1590/S1413-81232006000100013
Abstract: fluoride has been used to prevent dental caries. it is used in supply water and toothpastes. one undesirable effect has been found: mild dental fluorosis. such stains have aroused concern among specialists. this paper examines, in the literature, ethical aspects resulting from the use of fluoride in public health associated with the "caries prevention versus mild fluorosis occurrence" contradiction and investigates the occurrence of any ethical dilemma among the professionals involved in decision on the use of such products. databases were assessed to identify papers through terms such as ética, bioética, ethics and fluor. the material contributed to the drawing up of a questionnaire answered by researchers and health authorities. the data provided by the interviews underwent content analysis. the ethics dilemma may be stated as: "the use of fluoride products to prevent dental caries has in public health the inconvenience of producing mild dental fluorosis in the population, however, the non-use of fluoride has the inconvenience of not preventing the appearance of a disease (caries) that can be prevented if such product is used." the dilemma has shown to be solved, by admitting that the use of such products would be fair and that its benefit would exceed its damages. nevertheless, some of the respondents admitted a violation of the principle of autonomy.
A stochastic reachability approach to portfolio construction in finance industry
Giordano Pola,Gianni Pola
Quantitative Finance , 2009,
Abstract: In finance industry portfolio construction deals with how to divide the investors' wealth across an asset-classes' menu in order to maximize the investors' gain. Main approaches in use at the present are based on variations of the classical Markowitz model. However, recent evolutions of the world market showed limitations of this method and motivated many researchers and practitioners to study alternative methodologies to portfolio construction. In this paper we propose one approach to optimal portfolio construction based on recent results on stochastic reachability, which overcome some of the limits of current approaches. Given a sequence of target sets that the investors would like their portfolio to stay within, the optimal portfolio allocation is synthesized in order to maximize the joint probability for the portfolio value to fulfill the target sets requirements. A case study in the US market is given which shows benefits from the proposed methodology in portfolio construction. A comparison with traditional approaches is included.
Leaf Discs as a Source Material for Plant Tissue Culture Studies of Sorghum bicolor (L.) Moench.
Sudhakararao POLA
Notulae Scientia Biologicae , 2011,
Abstract: Sorghum bicolor is one of the most difficult plant species to manipulate for tissue culture and genetic transformation; on the other hand Sorghum crop improvement through biotechnology requires efficient plant tissue culture protocols. In the present study a protocol has been optimized for Sorghum callus induction and regeneration from leaf tissue by optimizing the suitable explant, photoperiod and media composition. In Sorghum generally inflorescence tissue was used as explants for initiating callus cultures. Conversely, Sorghum flowering occurs only once in its life time and for few days only, thereby providing a small window of opportunity to provide source material or explant to initiate callus. Hence it is essential to identify a suitable explant, which can be available at any season. In the present study efficient callus induction was achieved on media supplemented in combination with 2 mgl-1 2,4,5-T plus 1 mgl-1 NAA and 0.5 mgl-1 ZN. Among the different combinations and concentrations of plant growth regulators tried for regeneration, 2.5 mgl-1 TDZ plus 1.0 mgl-1 BAP and 0.5 mgl-1 IAA showed better shoot regeneration frequency with 62.2±4.6 shoots per explant after 4 weeks of culture. Similarly, root induction was obtained from shoots with 1.0 mgl-1 NAA followed by their transfer to half strength MS medium which produced an average of two roots per shoot. Among the six genotypes tested, genotype ‘IS3566’ displayed superior results. Because of the reproducibility and the easy of accessibility of leaf tissue, the plant regeneration from leaf tissue provides a foundation for genetic transformation of Sorghum; this is of significant importance for improving important traits such as biomass, protein and sucrose content.
Cárie dentária e flúor: uma rela??o do século XX
Narvai,Paulo Capel;
Ciência & Saúde Coletiva , 2000, DOI: 10.1590/S1413-81232000000200011
Abstract: in the early of twentieth century, dental caries were a big public health problem around world. infection, pain, suffering and mutilation reached all people. the discovering of preventive effect of fluorine became them, through the century, the main agent in fighting to disease worldwide. in various countries, including brazil, fluoridated products have been pointed as main causes for dental caries prevalence decline. also in brazil, at the 50s and 60s, the preventive effect of water fluoridation was ratified for some pioneer studies. for the period 1986-1996 epidemiological data shown a significant reduction of 53% in the dmf-t index value at 12-years-old schoolchildren. water and dentifrices are largely used as vehicle for fluoride in public health actions. in brazil 42% of population has access to fluoridated water. most dentifrices contain fluoride. this paper approach historical aspects of fluoride uses in public health and presents any epidemiological data on dental caries prevalence in brazil. conclude asking if fluoridated products will have same importance for oral health promotion in next decades.
Saúde bucal coletiva: caminhos da odontologia sanitária à bucalidade
Narvai,Paulo Capel;
Revista de Saúde Pública , 2006, DOI: 10.1590/S0034-89102006000400019
Abstract: this essay focuses on the pioneer activities of public health dentistry in brazil and its evolution in the 20th century with emphasis on the emergency of a landmark, the sanitary dentistry. social and preventive dentistry and market dentistry, with reference to the main theoretical works representative of these trends, are presented. the essential characteristics of collective oral health (brazilian variant of public health dentistry) and buccality are presented. the relationship between collective oral health and collective health as well as the implications of the buccality concept for the development of public health dentistry actions and new guidance of clinical practice in public services of the brazilian health system (sus) are discussed. the key elements of an agenda for collective oral health based on proposals presented at the 3rd national conference on oral health are addressed.
Saúde bucal coletiva: caminhos da odontologia sanitária à bucalidade
Narvai Paulo Capel
Revista de Saúde Pública , 2006,
Abstract: O ensaio aborda o surgimento das primeiras atividades odontológicas sob responsabilidade do poder público no Brasil e sua evolu o no século XX, enfatizando a emergência do marco referencial denominado odontologia sanitária. Caracteriza, sumariamente, a odontologia social e preventiva e a odontologia de mercado, indicando as principais publica es que se ocuparam dessas correntes. As características essenciais da saúde bucal coletiva e da bucalidade s o apresentadas, tecendo-se considera es sobre a articula o da saúde bucal coletiva com a saúde coletiva. Discutem-se as implica es do conceito de bucalidade para a organiza o da prática odontológica e a necessidade de reorienta o do trabalho clínico nos servi os de saúde bucal, no ambito do Sistema único de Saúde brasileiro. Indicam-se os elementos essenciais de uma agenda para a saúde bucal coletiva, com base nas proposi es apresentadas na 3a Conferência Nacional de Saúde Bucal.
A new category of “future planning” in the activity card sort: Continuity versus novelty in old age  [PDF]
Tsameret Ricon, Pola Weissman, Naor Demeter
Health (Health) , 2013, DOI: 10.4236/health.2013.52025
Abstract:

The Activity Card Sort (ACS) is a widely used measure for assessing participation in instrumental, leisure, and social-cultural activities. The ACS addresses previous and current activities but not future activity plans. The purpose of the study was to extend the ACS to include future planning. Previous research indicates that participation in activities and future planning is positively related to life satisfaction, and increased well-being and that these positive effects were most pronounced for adults 60 years and older. The current study participants were 60 Israeli adults aged 55 - 74 years. The research finds future planning to be widespread, common and significant among older adults. Moreover, it was found that older people planned to continue previous activities more that they planned new activities for the future, indicating more continuity than innovation among the participants in this study. Participants with higher current or past activity levels planed a greater number of future activities. Construct validity using known group method showed the extended ACS to have discriminant validity with respect to age (younger participants were more active) and gender (highly physical activities were favored by men). MANOVA repeated measures and Pearson correlations demonstrated moderate-high test-retest reliability for the extended ACS.

Laser Photolysis and Thermolysis of Organic Selenides and Tellurides for Chemical Gas-phase Deposition of Nanostructured Materials
Josef Pola,Akihiko Ouchi
Molecules , 2009, DOI: 10.3390/molecules14031111
Abstract: Laser radiation-induced decomposition of gaseous organic selenides and tellurides resulting in chemical deposition of nanostructured materials on cold surfaces is reviewed with regard to the mechanism of the gas-phase decomposition and properties of the deposited materials. The laser photolysis and laser thermolysis of the Se and Te precursors leading to chalcogen deposition can also serve as a useful approach to nanostructured chalcogen composites and IVA group (Si, Ge, Sn) element chalcogenides provided that it is carried out simultaneously with laser photolysis or thermolysis of polymer and IVA group element precursor.
Sistemas y servicios de información digital (E. Abadal Falgueras)
pola, Pedro
Revista Espa?ola de Documentación Científica , 2002,
Abstract:
Symbolic Models for Nonlinear Control Systems: Alternating Approximate Bisimulations
Giordano Pola,Paulo Tabuada
Mathematics , 2007,
Abstract: Symbolic models are abstract descriptions of continuous systems in which symbols represent aggregates of continuous states. In the last few years there has been a growing interest in the use of symbolic models as a tool for mitigating complexity in control design. In fact, symbolic models enable the use of well known algorithms in the context of supervisory control and algorithmic game theory, for controller synthesis. Since the 1990's many researchers faced the problem of identifying classes of dynamical and control systems that admit symbolic models. In this paper we make a further progress along this research line by focusing on control systems affected by disturbances. Our main contribution is to show that incrementally globally asymptotically stable nonlinear control systems with disturbances admit symbolic models. When specializing these results to linear systems, we show that these symbolic models can be easily constructed.
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