Manutenção da Heterozigosidade em populações de plantas autógamas

Neste trabalho objetivou-se verificar, teoricamente , a possibilidade de manutenção de heterozigotos, em populações de plantas autógamas, na presença e na ausência de seleção dependente de frequência (SDF). Considerou-se apenas um loco com dois alelos. Utilizou-se a dedução algébrica de formulas referentes a alguns modelos de populações e um programa para simular a sucessão das gerações em uma calculadora científica avançada. Comparou-se os resultados do modelo com os dados obtidos experimentalmente por Allard e Workman (1963) e por Harding, Allard e Smeltzer (1966). Os coeficientes de determinação foram 0,9653 e 0,9166 para a primeira e a segunda comparação, respectivamente. Estes coeficientes indicam que o modelo D representa de modo bastante fidedigno as variações observadas em populações experimentais de plantas predominantemente autógamas

Aproximações teóricas sobre a questão ambiental internacional na sociedade global: de estocolmo 1972 ao rio de janeiro 2012

O artigo apresenta os principais elementos que compõem a questão ambiental na sociedade global, através de sua relação entre economia, meio ambiente e política internacional. A primeira parte expõe o debate ambiental no contexto internacional, enfocando-o a partir dos anos 1960, período em que os problemas ambientais surgem com mais intensidade e com eles os protestos sociais nos países centrais. Os encontros sobre política ambiental internacional foram realizados com mais frequência nos anos setenta como a conferência internacional sobre meio ambiente, a primeira chancelada pela ONU em Estocolmo, 1972. Nas décadas de 1970/1980 as autoridades governamentais reconheceram a urgência na resolução da crise ambiental e passaram a traçar estratégias para a mitigação e contenção da crise. A década de 1990 é marcada pela Conferência Rio 1992, que lançou o desenvolvimento sustentável, o qual recomenda que as gerações presentes devem se reproduzir sem comprometer a capacidade de reprodução das gerações futuras. Os encaminhamentos da terceira conferência internacional sobre meio ambiente (Johanesburgo, 2002) condicionaram a questão ambiental à necessidade da formulação de leis ambientais por parte dos Estados Nacionais e instrumentos económicos de gestão ambiental. Na Rio + 20, o tema central foi a economia verde, que surge como alternativa ao desenvolvimento sustentável e se relaciona a mitigação das mudanças climáticas, produção de baixo carbono, eficiência energética, energia renovável etc. O texto se encerra explanando sobre a questão ambiental internacional na sociedade global.

O Caráter Tectônico do Moderno Brasileiro: Bernardes e Campello na Paraíba (1970-1980)

This study aims to analyze the tectonic character of the works of Sergio Bernardes and Glauco Campello architects, built in Paraiba, between the turn of the decade in 1970 and early 1980 in order to bring reflections about the poetics of construction s importance in the formal structure of the architecture, contributing to the debate about the specificitiesand peculiarities of modern architecture produced in Brazil. The research, using the strategies of the case study, startsfromthe review on the use of "tectonic" by Kenneth Frampton and other scholars of the term, to base the concept and set the analytical parameters of the tectonics. Then it proceeds to the insertion of buildings in the cultural and socio-political Brazilian s context in the periodproposed forstudy, in sequence, analyzesthe works of each architect. The study confirms that the expressive power of Brazilian heroic modern architecture, emphasizing the poetics of construction, sediments a tectonic culture that resonates in the following generations

Paisagem, um patrimônio esquecido: subsídios para a construção de uma metodologia de valoração e proteção do cenário natural litorâneo

The so-called "residential tourism" came to intensify the previous occupation of the coastal zones, characterized by traditional beach houses, and brought significant consequences for their spatial configuration, and especially for its scenic value of the landscape. Although there is the intention to regulate the activities of enterprising groups by some legal instruments to control the use and occupation of land, and to contain some negative effects, the actions of government are still inefficient in trying to follow the implications on the landscape from the accelerated growth of the real estate and touristic sectors. Supported in the speech of economic development and income generation, public managers prioritize areas to attract tourists to the detriment of preserving important physical attributes of the natural environment that contribute significantly to the quality of life. The result can be noticed in the use of natural elements as one of the major components in the land valorization, and in the immediate attraction of investors and enterprising. Therefore, the objective of this work is to contribute to the debate on the landscape preservation a little detailed thematic in view of their relevance in the current context - by indicating subsidies to the creation of a methodology for the evaluation and protection of coastal zones that may assist the government in creating new instruments, and better prepare it in control of the occupation of these areas. For such, was followed two ways to analysis: the indirect method and the direct method. The first is grounded in the evaluation of landscape attributes, which is based on the work of Raquel Tardin (2008) and Eduardo Cuesta, Encarnación Algarra and Isabel Pastor (2001). The second, based on the research of Leticia and Carlos Hardt (2010) and on the concepts of phenomenology - expressed by Antonio Christofoletti (1985) and Yi-Fu Tuan (1983) - considers the population perspective on the quality of the natural scenery. Developed through cartographic materials, photographic collections and quantitative tables, this dissertation utilized as a case study the beaches of Barra de Tabatinga and Camurupim, located in the city of Nísia Floresta/RN. Despite already being sighted spaces of advanced stage of landscape degradation in these locations, areas of remarkable scenic value can still be found, what reinforce the urgency in adopting preservationists actions. The absence of laws focused on the management and protection of the landscape singularities associated with the inefficiency of the government to invigilate the land occupation in coastal zones, encourage the excessive action of the real estate-tourism, and consequently make the government the main responsible for the environmental and landscape impacts in these areas - by its omission or by their connivance. Therefore, the legislation permeates this entire process and constitutes itself as the most effective way to guarantee the right to the landscape to present and future generations. Are also pointed some important considerations to build a methodology, especially concerning possibilities of improvements and adaptations of its applicability in each case

Entre o cartão-postal e a cidade real: um estudo sobre paisagem e produção imobiliária em Natal/RN

Recent studies concerning the landscape have investigated the most important activities that contribute for its modification and have tried to better understand the society through the marks left by its quotidian. It is understood that singular landscapes constitute the cultural patrimonies of the cities, once they are part of the daily life of the citizens and are present in their social representations. Some contemporary authors defend the preservation of the natural and urban landscape trying, specially, to keep its importance for the local population. Natal is a city where the ambient qualities are well defined and known by the beauty of the area where it is located. Situated just between a river and the sea, the city grew following its geographic characteristics. The Potengi River, the Atlantic Ocean and the vast dunes ecosystem represented natural limits to the urban expansion; at the same time they have favored the development of a landscape pattern marked by the dialectic between the natural elements and the human interventions. However, this relationship changed after the intensification of the high rising development process that took place since the 1960s. The urban legislation tried to preserve the features of the local landscape delimiting Areas for Controlling Building High , destined to protect the scenic value of some parts of the city. On the other hand, the civil construction sector has made constant pressure in sense to abolish or to modify this legal instrument, aiming profits that have increased, in the 1990s, because of the consumption and the qualification of the urban space for tourist activities. It is necessary the raising of new elements to stimulate the quarrel about the landscape preservation, the process of the urban space production and the best way for the legislation implementation. This work tries to raise elements about the subject at local level, in sense to use Natal City experience to contribute for the formulation of indicators to raise the question about the lack of measure for subjective values, for example the cultural and affective value of the landscape. The natural elements inserted in the urban profile, represent strong visual references and supply identity to the town; they are part of the collective imaginary and are detached in the social context of the city. Then, why the preservation of the landscape, that estimates the improvement in the quality of life, is not enough to justify the controlling building high already previewed as part of Natal City Legislation? These questions send us to the approach of the landscape, as a community patrimony, alerting that some of its significant esthetics attributes must be preserved as a legacy for the future generations