Universidade da Madeira
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- Studies en enzymes of paramecium caudatumPublication . Khadem, Mahnaz
- Estudo da relação do desenvolvimento psicomotor e o aproveitamento escolar no ensino primárioPublication . Melo, Aldina Mécia Loja e Silva
- Fluido de Euler bidimensional: construção de medidas estacionárias e fluxo estocásticoPublication . Faria, Margarida Maria Coelho Ribeiro de; Albeverio, Sérgio
- Estimating diet composition from scat analysis in otariid seals (Otariidae): is it reliable?Publication . Dellinger, T.; Trillmich, F.Analysis of teleost sagittal otoliths contained in scats has been widely used to determine the diet of seals. This method is based on the assumption that relative frequencies of otoliths in scats faithfully reflect those of fish in the diet. This assumption has rarely been tested experimentally. We compared the ratios of herring (Clupea harengus) to sprat (Sprattus sprattus) oto liths in faeces (output) of captive California sea lions (Zalophus calijornianus) and South American fur seals (Arctocephalus australis) with the ratios at feeding (input). Sea lions and fur seals showed no consistent differences in recovery rates and partial digestion of otoliths. Output ratios deviated only slightly from input ratios, the smaller sprat otoliths being underrepre sented in the output by 8%. Only about 40% of the otoliths fed to the seals were found in the scats. For both species partial digestion of otoliths led to a 16% underestimation of fish length and a 35% underestimation of fish mass.
- Affine and curvature collineations in space-timePublication . Costa, José Manuel Nunes Castanheira da
- Do agrarismo ao liberalismo. Francisco Soares Franco. Um pensamento críticoPublication . Câmara, Benedita Cardoso
- Evolution of the obscura group Drosophila species.: III. phylogenetic relationships in the subobscura cluster based on homologies of chromosome APublication . Brehm, A.; Krimbas, C. B.The Drosophila subobscura cluster comprises D. subobscura, D. madeirensis and D. guanche, species closely related to some interspecific crosses are possible. This paper clarifies definitively the homologies of the segments of the sex chromosome A (= X) among these species and thus permits a phylogenetic seriation of them. This seriation is identical to the one suggested by the study of chromosome O and concordant with similar data for the remaining three rod autosomes (J, U and E), which, however, do not provide qualitative evidence on this subject.
- Estudo hidrogeológico do Paúl da SerraPublication . Prada, Susana Luísa Rodrigues Nascimento
- The basicity of alkali metal methoxides in methanol. The effects of ion association on methoxide additions to activated anisolesPublication . Castilho, Paula C. M. F.; Crampton, Michael R.; Yarwood, JackThe formation of adducts with 1 :2 and 1:3 stoichiometry by methoxide addition to nitro-activated anisoles has been examined spectrophotometrically. For these equilibria the ‘basicity’ of sodium methoxide solutions in methanol is appreciably greater than that of corresponding potassium methoxide solutions. This is in contrast with other measures of basicity and is attributed to the association of the multi-charged adducts with cations which is stronger with sodium than with potassium ions.