Catinga- und Felsenformationen in Bahia

von E. Ule

Catinga- und Felsenformationen in Bahia

Von E. Ule

Element contents, sulfur and oxygen isotopes, and molecular biomarkers of phosphatic crust samples from the Chimbote Platform of the shelf off Peru

Authigenic phosphatic laminites enclosed in phosphorite crusts from the shelf off Peru (10°01' S and 10°24' S) consist of carbonate fluorapatite layers, which contain abundant sulfide minerals including pyrite (FeS2) and sphalerite (ZnS). Low d34Spyrite values (average -28.8 per mill) agree with bacterial sulfate reduction and subsequent pyrite formation. Stable sulfur isotopic compositions of sulfate bound in carbonate fluorapatite are lower than that of sulfate from ambient sea water, suggesting bacterial reoxidation of sulfide by sulfide-oxidizing bacteria. The release of phosphorus and subsequent formation of the autochthonous phosphatic laminites are apparently caused by the activity of sulfate-reducing bacteria and associated sulfide-oxidizing bacteria. Following an extraction-phosphorite dissolution-extraction procedure, molecular fossils of sulfate-reducing bacteria (mono-O-alkyl glycerol ethers, di-O-alkyl glycerol ethers, as well as the short-chain branched fatty acids i/ai-C15:0, i/ai-C17:0 and 10MeC16:0) are found to be among the most abundant compounds. The fact that these molecular fossils of sulfate-reducing bacteria are distinctly more abundant after dissolution of the phosphatic laminite reveals that the lipids are tightly bound to the mineral lattice of carbonate fluorapatite. Moreover, compared with the autochthonous laminite, molecular fossils of sulfate-reducing bacteria are: (1) significantly less abundant and (2) not as tightly bound to the mineral lattice in the other, allochthonous facies of the Peruvian crusts consisting of phosphatic coated grains. These observations confirm the importance of sulfate-reducing bacteria in the formation of the phosphatic laminite. Model calculations highlight that organic matter degradation by sulfate-reducing bacteria has the potential to liberate sufficient phosphorus for phosphogenesis.

Dossiê A Realidade do Aborto Inseguro na Bahia: a Ilegalidade da Prática e seus Efeitos na Saúde das Mulheres em Salvador e Feira de Santana

http://www.ipas.org.br/arquivos/RELEASE_Dossie_BA.pdf

Uma história da grave das tecelâs/ôes de Salvador-Bahia en setembro de 1919

This article aims to analyze the movement of weavers' strike (according to an specific context), its origins, actions and consequences, prompting the internal system of factories (their regulations), the hierarchical relationships of power, and struggles to guarantee the right of association, which resulted in the stoppage of all activities of the textile sector. The attitude to go on a strike, mobilizations and the stroll show that the direction of the movement and the working class were aware of their actions and those likely consequences, what signalize, beforehand, the ideological, classist and political character of women´s actions: radicalized by the practices of confronting the authoritarianism employers and threats (police repression, harassment of the press). They endured through the collective support and a network of solidarity

A Importância do Programa de Aquisição de Alimentos (PAA) nos territórios da cidadania dos Estados de Minas Gerais e da Bahia : Criação de novos mercados a partir da visão dos Agentes de Assistência Técnica e Extensão Rural (ATER)

This article aims to identify how the Foodstuff Acquisition Program has influenced market creation for family farmers in two Brazilian states - Minas Gerais e Bahia and also the limitations and benefits of the program from the point of view of the extension agents. A bibliographic research and a quantitative exploratory study were conducted, questionnaires were sent to extension agents who work for public rural extension agencies, municipalities, NGOs, cooperatives and producers' associations, during the year 2010-2011.