Life-history, thallus ontogeny, and the effects of temperature, irradiance and salinity on growth of the edible green seaweed Gayralia spp. (Chlorophyta) from Southern Brazil

Gayralia K.L. Vinogr. is a monostromatic green alga of commercial importance in the southern Brazil, and its cultivation is being considered. This paper reports some basic aspects of the biology of this poorly known genus. Two populations of Gayralia spp., from outer and inner sectors of Paranagua Bay, showed an asexual life history with a distinct pattern of thallus ontogeny. In one population (Gayralia sp. 1), zooids developed an expanded monostromatic blade directly, while in the other (Gayralia sp. 2) zooids produced an intermediate saccate stage, before giving rise to a monostromatic blade. Thalli of the two species differ in size and in cell diameter. The effects of temperature (16-30 degrees C), irradiance (50-100 mu mol photons m(-2) s(-1)), and salinity (5-40 psu) on the growth of both populations were assessed. Plantlets of Gayralia sp. 1 from in vitro cultures showed a broader tolerance to all salinity and irradiance levels tested, with the highest growth rate (GR; mean 17% day-1) at 21.5 degrees C and 100 mu mol photons m(-2) s(-1). Plantlets of Gayralia sp. 1 collected during the winter in the field showed higher GR, ranging from 5% day(-1) to 7.5% day(-1) in salinities from 20 to 40 psu, and 2.0% day(-1) and 4.3% day(-1) for plantlets collected during the summer. Gayralia sp. 2 from the field showed highest GR at salinity of 15 psu. These results suggest distinct physiological responses of the two species, in accordance with their distribution: Gayralia sp. 2 is limited to the inner areas of the estuary, while Gayralia sp. 1 grows in outer areas, where salinity values are higher than 20 psu. These data indicate that Gayralia sp. 1 has a higher potential for aquaculture than Gayralia sp. 2 due to its larger thalli, higher GR, and wider tolerance to environmental variations.

Science Teacher Education in Brazil: 1950-2000

This paper analyzes the most significant events occurring in Brazil`s educational, social and political areas over the last half century, viewed against a background of relevant worldwide events. The hypothesis presented here is that the relations between the country`s educational policies, the demands of the various segments of academia, and the public school system have always been strained. This strain has contributed positively to the evolution of academic knowledge and production, to the design of more modern curricular projects by institutional authorities, and to the initial recognition of the specific construction of school knowledge by the school system itself. However, the interaction of these major institutions lacks a crucial element-one that would lead to an effective change in the education of science teachers and produce a positive impact on Brazil`s schools-namely, the wholehearted participation of science teachers themselves. With this analysis, we intend to contribute by offering some perspectives and proposals for science teacher education in Brazil.

Precambrian history of the Zona Transversal of the Borborema Province, NE Brazil: Insights from Sm-Nd and U-Pb geochronology

The Borborema Province has three major subprovinces. The northern subprovince lies north of the Patos shear zone and is comprised of Paleoproterozoic cratonic basement with Archean nuclei, plus overlying Neoproterozoic supracrustal rocks and Brasiliano plutonic rocks. The central subprovince occurs between the Patos and Pernambuco shear zones and is mainly comprised of the Zona Transversal. The southern subprovince occurs between the Pernamabuco shear zone and the Sao Francisco craton and is comprised of a tectonic collage of various blocks, terranes, or domains ranging in age from Archean to Neoproterozoic. This report focuses on the Zona Transversal, especially on Brasiliano rocks for which we have the most new information. Paleoproterozoic gneisses with ages of 2.0-2.2 Ga occur discontinuously throughout the Zona Transversal. The Cariris Velhos suite consists of metavolcanic, metasedimentary, and metaplutonic rocks yielding U-Pb zircon ages of 995-960 Ma. This suite is mainly confined to a 100 km wide belt that extends for more than 700 km within the Alto Pajeu terrane. Sm-Nd model ages in metaigneous rocks cluster about 1.3-1.6 Ga, indicating that older crust was involved in genesis of their magmas. Brasiliano supracrustal rocks dominate the Pianco-Alto Brigida terrane, and they probably also constitute significant parts of the Alto Pajeu and Rio Capibaribe terranes. They are only slightly older than early stages of Brasiliano plutonism, with detrital zircon ages at least as young as 620 Ma; most T(DM) ages range from 1.2 to 1.6 Ga. Brasiliano plutons range from ca. 640 to 540 Ma, and their T(DM) ages range from 1.2 to 2.5 Ga. Previous workers have shown significant correlations among U-Pb ages, Sm-Nd model ages, petrology, and geochemistry, and we are able to reinforce and extend these correlations. Stage I plutons formed 640 -610 Ma and have T(DM) ages less than 1.5 Ga. Stage 11 (610-590 Ma) contains few plutons, but coincides with the peak of compressional deformation, metamorphism, and formation of migmatites. Stage III plutons (590 to ca. 575 Ma) have older T(DM) ages (ca. 1.8-2.0 Ga), as do Stage IV plutons (575 to ca. 550 Ma; T(DM) from 1.9 to 2.4 Ga). Stage III plutons formed during the transition from compressional to transcurrent deformation, while Stage IV plutons are mainly post-tectonic. Stage V plutons (550-530 Ma) are commonly undeformed (except along younger shear zones) and have A-type geochemistry. The five stages have distinct geochemical properties, which suggest that the tectonic settings evolved from early, arc-related magma-genesis (Stage I) to within-plate magma-genesis (Stage V), with perhaps some intermediate phases of extensional environments. (C) 2011 Elsevier Ltd. All rights reserved.

Denudation history of the Bocaina Plateau, Serra do Mar, southeastern Brazil: Relationships to Gondwana breakup and passive margin development

The Bocaina Plateau, which is situated on the eastern flank of the continental rift of southeastern Brazil, is the highest part of the Serra do Mar. Topographic relief in this area is suggested to be closely related to its complex tectono-magmatic evolution since the breakup of Western Gondwana and opening of the South Atlantic Ocean. Apatite fission track ages and track length distributions from 27 basement outcrops were determined to assess these hypotheses and reconstruct the denudation history of the Bocaina Plateau. The ages range between 303 +/- 32 and 46 +/- 5 Ma, and are significantly younger than the stratigraphic ages. Mean track lengths vary from 13.44 +/- 1.51 to 11.1 +/- 1.48 mu m, with standard deviations between 1.16 and 1.83 mu m. Contrasting ages within a single plateau and similar ages at different altitudes indicate a complex regional tectonothermal evolution. The thermal histories inferred from these data imply three periods of accelerated cooling related to the Early Cretaceous continental breakup, Early Cretaceous alkaline magmatism, and the Paleogene evolution of the continental rift of southeastern Brazil. The oldest fission track ages (>200 Ma) were obtained in the Serra do Mar region, suggesting that these areas were a long-lived source of sediments for the Parana, Bauru, and Santos basins. (C) 2010 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.

From legal commons to social commons: Brazil and the cultural industry in the 21st century

This article describes some of the current transformations regarding the processes by which information and culture are generated, from the point of view of developing countries. In this brief analysis, the article discusses the role of projects such as Creative Commons for developing countries. It also discusses the idea of legal commons and social commons. While the idea of legal commons can be understood as the voluntary use of licenses such as Creative Commons in order to create a “commons”, the idea of social commons has to do with the tensions between legality and illegality in developing countries. These tensions appear prominently in the so-called global “peripheries”, and in many instances make the legal structure of intellectual property irrelevant, unfamiliar, or unenforceable, for various reasons. With the emergence of digital technology and the Internet, in many places and regions in developing countries (especially in the “peripheries”), technology ended up arriving earlier than the idea of intellectual property. Such a de facto situation propitiated the emergence of cultural industries that were not driven by intellectual property incentives. In these cultural businesses, the idea of “sharing” and of free dissemination of the content is intrinsic to the social circumstances taking place in these peripheries. Also, the appropriation of technology on the part of the “peripheries” ends up promoting autonomous forms of bridging the digital divide, such as the “LAN house” phenomenon discussed below. This paper proposes that many lessons can be learned from the business models emerging from social commons practices in developing countries. The tension between legality and illegality in “peripheral” areas in developing countries is not new. The work of Boaventura de Sousa Santos and others in the 1970s was paradigmatic for the discussion of legal pluralism regarding the occupation of land in Brazil. This paper aims to follow in that same pioneer tradition of studies about legal pluralism, and to apply those principles to the discussion of “intellectual property” rather than the ownership of land.

Memórias de trabalhadores do Vital Brazil: um diálogo entre a saúde e a comunidade

O estudo teve como proposta identificar na comunidade do Morro do Vital Brazil referências que indicassem sentido de coletividade e continuidade. Essa comunidade, como pretendido apontar, teria sua origem, nas décadas de 1920 e 1930, no entorno do Instituto de Hygiene, Sorotherapia e Veterinária do Estado do Rio de Janeiro, hoje, Instituto Vital Brazil. Por ser fábrica farmacêutica, a produção necessitaria de mão-de-obra, que no caso estudado, passou a morar no morro atrás do Instituto, mas ainda em seu território. Dessa origem, surge uma comunidade com características de cooperação, união e associativismo. Com a prosperidade da fábrica, cresce o número de moradores e inicia-se um conjunto de domicílios e famílias também possuidores de aspectos em comum. Essas identidades possibilitam um encontro com o poder público na forma de políticos e políticas, como o Programa Médico de Família. Com esse último, interesse inicial da pesquisa, nasceu a relação entre a pesquisadora em questão, médica no posto PMF Vital Brazil, e evidenciou performances dos moradores que indicavam um pertencimento e lugar de fala diferenciado. O estudo apontou características da comunidade e dos atores que contribuíram na criação desse coletivo, utilizou como metodologia a história oral.

Oral history in Brazil: an assessment

This overview of the development of the oral history field in Brasil analyzes the different approaches used in the area, discusses its major topics of interest, and traces the organizational and historical paths of the country's most important oral history programs.

Brazil & Lusphone Africa: a study of history, international relations, & international trade

This report was inspired by a personal motivation to acquire more in depth knowledge about Brazil and Lusophone (Portuguese speaking) African nations and how they interact with each other in relation to their common colonial histories, cultures, and on matters of international relations, international development, and international trade. The countries selected for purpose and focus of this report are Brazil, Angola, and Mozambique; reference will also be made with respect to other Lusophone African countries such as Cabo Verde, Guinea-Bissau, and São Tomé e Príncipe. Some of the research methodologies used to gather information about Brazil, Angola, Mozambique, and other Lusophone African nations in relation to their respective histories, international relations, international trade relations, and roles in the global economy as emerging market nations.

An essay on private equity: the history and fundamentals of fundraising in Brazil

O impacto positivo dos investimentos de Private Equity e Venture Capital (PE/VC) na economia e no mercado de capitais está amplamente documentado pela literatura acadêmica internacional. Nos últimos 40 anos, diversos autores têm estudado a influência desta classe de ativos na criação, no desenvolvimento e na transformação de milhares de empresas ao redor do mundo, especialmente nos Estados Unidos. Entretanto, os estudos sobre os determinantes da captação de recursos de PE/VC têm se desenvolvido apenas mais recentemente, e seus resultados estão longe de ser uma unanimidade. No Brasil, a pesquisa sobre a indústria de PE/VC ainda é escassa. Embora a indústria local venha crescendo rapidamente desde 2006, tendo alcançado US$36,1 bilhões em capital comprometido em 2009, ainda não há estudos sobre as variáveis que influenciam na alocação de capital pelos investidores nesta modalidade de investimento no Brazil. Entender esta dinâmica é importante para o equilíbrio e a eficiência de mercado. Baseado no trabalho de Gompers e Lerner (1998) sobre os determinantes da indústria de PE/VC nos Estados Unidos, este trabalho contribui com a literatura de PE/VC ao: (i) revisitar o começo desta indústria no Brasil; e (ii) identificar quais as variáveis influenciam no desenvolvimento da indústria de PE/VC local. Os resultados deste estudo contribuem para o desenvolvimento acadêmico da indústria de PE/VC no Brasil. Além disso, as discussões aqui apresentadas poderão impactar outras áreas de estudo que são permeadas pelo tema, tais como Gestão de Investimentos, Governança Corporativa, Empreendedorismo e Estratégia. Profissionais de mercado também deverão se interessar no trabalho. As discussões sobre a história e os fundamentos da indústria fornecem aos investidores, empreendedores, gestores de investimentos e formuladores de políticas públicas, entre outros, um melhor entendimento sobre como o ecossistema de PE/VC funciona no Brasil.