995 resultados para 25 hydroxycolecalciferol 26
Resumo:
Mirocaris fortunata were sampled from the Lucky Strike hydrothermal vent area (Eiffel Tower site) on the mid-Atlantic ridge during the French DIVA 2 cruise (June 1994). Small adults (17 to 22 mm total length), although morphologically identical, could be divided into 2 categories on the basis of pigmentation, lipid composition and C-13/C-12 stable isotope ratios of fatty acids. Highly pigmented small adults (8.6 to 9.2 mu g carotenoid shrimp(-1)) contained higher levels of total lipid than similar-sized individuals containing lower levels of pigment (0.9 to 2.9 mu g carotenoid shrimp(-1)). Lipid class analysis indicated that wax esters comprised 62.5% of total lipid in the former group. These pigmented shrimp also contained high proportions of polyunsaturated fatty acids (PUFA), particularly the phototrophic microplanktonic markers 20:5(n-3) and 22:6(n-3) (14.0 and 33.5% respectively). By contrast small adults (22 mm) and adult shrimp (25 to 26 mm) with low levels of carotenoid pigmentation contained lower amounts of total lipid, little or no wax ester and low levels of 20:5(n-3) and 22:6(n-3), but did contain 16:2(n-4) and 18:2(n-4) and the non-methylene interrupted dienes 20:2 Delta 5,13 and 22:2 Delta 7,15. GC-IRMS analysis of all fatty acids and fatty alcohols in the pigmented small adults indicated delta(13)C values of -18.2 to -27.7 parts per thousand, which is consistent with a photosynthetic carbon source for these compounds. The C-13/C-12 isotope composition of fatty acids from low-pigmented small adults and adults was more variable (-12.5 to -33.1 parts per thousand) and suggests a bimodal distribution which may be attributable to differing nutritional sources or the physiological/reproductive status of these shrimp. Samples of eggs, which are carried by the female on the pleopods, represented approximately 57% of total somatic lipid which indicates a substantial reproductive investment by this species. The egg lipids comprised high proportions of triacylglycerols (64.4 to 78.0% of total lipid) whilst the fatty acid composition was dominated by the monounsaturated fatty acids 16:1(n-7), 18:1(n-7) and 18:1(n-9), which accounted for 65.7 to 33.5% of total fatty acids. By contrast, PUFA were relatively minor components of egg lipids, particularly 20:5(n-3) and 22:6(n-3), which accounted for only 1.1 and 2.9% of total egg fatty acids respectively. This indicates that the reproductive investment by this species is supported mainly by material derived from bacterial chemosynthesis. The potential for M. fortunata hedge betting by producing larvae which either metamorphose at the vent site or adopt a bathypelagic lifestyle and delay metamorphosis to facilitate more widespread dispersal is discussed.
Resumo:
O I Encontro Regional de Educação, realizado na Universidade de Évora, nos dias 25 w 26 de Fevereiro de 2003, assumiu-se como o primeiro passo de uma viagem pela Educação que vai acontecendo no território alentejano. Nascido no seio da disciplina de Seminário de Desenvolvimento do Projeto Educativo – disciplina constante dos planos de estudo dos Cursos de Complemento de Formação Científica e Pedagógica para Professoras(es) do 1º Ciclo do Ensino Básico e Educadoras(es) de Infância ministrados na Universidade de Évora – o I Encontro Regional de Aprendizagem congregou, na Universidade de Évora, mais de quatrocentas pessoas, oriundas de todo o Alentejo que, durante dois dias de intensa reflexão, discutiram alguns dos vértices mais decisivos desta complexa geometria educacional alentejana. Como facilmente decorre do conteúdo dos textos que são publicados no livro, o centro de gravidade da reflexão produzida radicou, em grande medida, nos contextos não formais de educação. Foi essa a orientação que seguiram muitos dos pequenos projetos de investigação protagonizados pelos estudantes dos Cursos de Complemento de Formação, no livro apresentados. Uma orientação que se baseou na preocupação de unir, na medida das possibilidades, os três vértices do triângulo que traduz a missão da Universidade: investigar, formar e servir a comunidade.
