953 resultados para Commodities primárias


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Apresentamos uma análise da obra História do Brasil Ensinada pela Biografia de seus Heróis - Ensino Cívico - livro para as classes primárias, lançado em 1890 por Silvio Romero pela Livraria Editora Francisco Alves. A obra teve pelo menos nove edições (a oitava datada de 1908 e a nona de 1913), o que sugere algum sucesso num momento em que os livros de leitura e as cartilhas eram os únicos (ou os principais) livros a que os alunos da escola primária tinham acesso. Concebida para “substituir pela biografia a instrução cívica”, Historia do Brasil evidencia a convergência, no século XIX, da produção de saberes acerca da realidade nacional (particularmente no Instituto Histórico e Geográco Brasileiro e na Academia Brasileira de Letras) com a nacionalização os currículos.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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Pós-graduação em Letras - FCLAS

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Pós-graduação em Zootecnia - FCAV

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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Dendrobium is a large genus in the family Orchidaceae that exhibits vast diversity in floral characteristics, which is of considerable importance to orchid breeders, biotechnologists and collectors. Native species have high value as a result of their medicinal properties, while their hybrids are important as ornamental commodities, either as cut flowers or potted plants and are thus veritable industrial crops. Thus, preservation of Dendrobium germplasm is valuable for species conservation, breeding programs and the floriculture industry. Cryopreservation represents the only safe, efficient and cost-effective long-term storage option to facilitate the conservation of genetic resources of plant species. This review highlights 16 years of literature related to the preservation of Dendrobium germplasm and comprises the most comprehensive assessment of thorough studies performed to date, which shows reliable and reproducible results. Air-drying, encapsulation-dehydration, encapsulation-vitrification, vitrification and droplet-vitrification are the current cryopreservation methodologies that have been used to cryopreserve Dendrobium germplasm. Mature seeds, pollen, protoplasts, shoot primordia, protocorms and somatic embryos or protocorm-like bodies (PLBs) have been cryopreserved with different levels of success. Encapsulation-vitrification and encapsulation-dehydration are the most used protocol, while PLBs represent the main explant explored.

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The most common endocrinal disease in the cat is hyperthyroidism. The excess of the thyroidal hormones in the circulation causes a hipermetabolic state, which leads to changes in all the systems of the organism. One of the most affected being the cardiovascular. The most common changes are the ventricular hypertrophic, hypertension and thromboembolism, which also occur in primary heart disease. This revision addresses the mechanism and modifications caused by the hyperthyroidism in the cardiovascular system and its importance in the differentials diagnosis