Percorrer por data de Publicação, começado por "1984-07"
A mostrar 1 - 10 de 13
Resultados por página
Opções de ordenação
- New K-Ar ages, chemical analyses and magnetic data of rocks from the Islands of Santa Maria (Azores), Porto Santo and Madeira (Madeira Archipelago) and Gran Canaria (Canary Islands)Publication . Ferraud, G.; Schincke, H.-U.; Lietz, J.; Gostaud, J.; Pritchard, G.; Bleil, U.K/Ar determination, major and trace element chemical analyses and magnetic data are reported for rocks from Santa Maria (Azores), Madeira and Porto Santo, and Gran Canaria. Based on these data, the age of the basement of Santa Maria is believed to have formed between about 5.2 and 4.6 Ma, the unconformably overlying pillow complex interbedded with fossiliferous calcarenites about 3.8 to 3.3 Ma with the capping subaerial basalt being part of the same magmatic phase. The major erosional phase levelling the basement is thus approximately synchronous with the major Pliocene regression (R2) m Gran Canaria (Lietz and Schminke, 1975), possibly indicating a widespread eustatic event. The upper part of the submarine, partly fossiliferous series of Porto Santo was dated as ca. 12 to 13 Ma and the Quaternary age for the major basalt formation in Eastern Madeira (Watkins and Abdel Monem, 1971) is confirmed. The agess of several formations on Gran Canaria were slightly revised. Chemical differences between basement (shield l) and later posterosional series on Gran Canaria are reemphasized by the new data, while such differences are much less pronounced between the basement and younger series on Santa Maria.
- Revisão das propriedades da Chelidonium majus L. (Papaveraceae) planta existente nas ilhas dos AçoresPublication . Pavão, Maria LeonorEstrutura química dos alalóides do látex da Chelidornium majus L., planta medicinal existente nas Ilhas dos Açores. Propriedades farmacológicas. Efeitos fungistático, antivírico, bacteriostático, de inibição e de deformação de protozoários, anti-tumoral, anti-inflamatório e de inibição enzimática.
- Efeito de um insecticida piretróide-permetrina sobre clorofíceas.Publication . Silva, Maria M.; Flores, Maria G.This study concerns the effects of a pirethroid insecticide permemethrin on growth kinetics of freshwater algae isolated from Furnas lake, Azores. Two species were studied, Scenedesmus protuberans and Chlorococcum humicola, which have quite different morphological and ecological characters. Results show a remarkable difference of behaviour. Scenedesmus protuberans presents a fading of the growth curves, on the 1th day after pesticide application. This tendency continues to increase till the 16th day. Chlorococcum humicola shows a sharp growth drop on 4th day of culture. Recover of growth starts after the 4th day, but never reaches the levels of control cultures.
- Réflexions sur le peuplement de la MacaronésiePublication . Le Grand, GéraldUn modèle est proposé pour expliquer la composition et l'origine des peuplements des cinq archipels de la Macaronésie.
- Status e distribuição das plantas vasculares endémicas dos AçoresPublication . Furtado, DuarteActual status and distribution of endemic vascular plants are presented. All know records are integrated in order to define priorities for conservation. This provisory red list should be revised each two years.
- Possíveis causas dos sismos dos AçoresPublication . Machado, FredericoOs abalos sísmicos dos Açores dependem certamente do mecanismo que faz mover as três placas litosféricas que existem na área destas ilhas. Um modelo de mecanismo que parece, adequado para explicar o ritmo das crises sísmicas baseia-se em pulsações de gravitação. Entre as principais perturbações neste ritmo figuram as marés terrestres (especialmente a semi-anual) e as variações de energia elástica disponível, devidas à própria fraturação que produz os abalos.
- Recovery of Dairy WastePublication . Tavares, Joaquim F. P.Pure lactose is being used increasingly by food industries because of its many unique characteristics. Its availability, low price, high nutritive value, low hygroscopicity plus good solubility make the incorporation of lactose attractive into many foods. It is used in baked goods, to impart moisture retaining tenderizing, and collar-appealing properties. Lactose is widely by used in baby- formulas and pharmaceuticals. Lactose is milk sugar that enzyme lactase breaks down. For want of lactase most adults cannot digest milk. In populations that drink milk, the adults have more lactase perhaps through natural selecties. About 1-4 % of milk input to dairies and creameries is wasted. The economic and nutritional value of this wastage is calculated. Attempts mover the wastage have been made in some instances but it is doubtful if recovery process is economically justifiable. A major part of the paper is concerned with whey, which constitutes a special problem, the extent of which is described and the nutritional value of the whey wastage calculated. Methods of treatment are discussed. «Conventional» treatments, including drying, direct animal feeding and lactose extraction, are briefly described together with newer «unconventional» treatments at greater length. These «unconventional» processes - gel filtration, ion exchange and ultrafiltration – generally aim at extracting the 0.7 % of true protein from whey in undenatured form. Ultrafiltration is now reaching a commercial scale. All three processes produce a lactose-rich by-product which, for economic success, must be utilised. Possible lactose utilisation includes fermentation either to a protein-rich biomass or other product e.g. alcohol, or by enzimic conversion to galactose/glucose syrup which may have a relatively ready acceptability in foodstuffs for subsequent f mentation. Neither process is yet established cm a commercial scale.
- Observações acerca de Popillia Japonica Newman na Ilha TerceiraPublication . Simões, Ana Maria M. ÁvilaNo presente trabalho faz-se urna breve análise sobre a actual situação de Popillia japonica Newman na ilha Terceira e apresentam-se os resultados de observações feitas no campo acerca do comportamento alimentar dos adultos e de ensaios realizados no laboratório sobre preferências alimentares.
- Estudos biométricos em Sylvia atricapilla e Erithacus rubecula dos Açores.Publication . Medeiros, Fátima; Le Grand, GéraldMorphological parameters for sexual dimorphism and inter and intra Island variation on Sylvia atricapilla and Erithacus rubecula (Azorean bird species) of two Islands, were quantified.
- Relation entre l'éfficacité biologique et le comportement chimique du Bifenox dans le sol d'une culture d'orge d'hiver.Publication . Leal, Hernâni S.Ce travail a comme objectif l'étude du comportement du Bifenox, un herbicide de La famille des diphénylétheres, le methyl 5 - (2,4 - dichloro-phenoxy)- 2- nitrobenzoate, dans le sol d'une culture d'orge d'hiver. On envisage la persistance dans le sol de ses résidus et d'un de ses metabolites potentiels, le nitroféne. Cela en function du temps et de la profondeur pour evaluer sa phytotoxicité. Cette étude a été entreprise par l'intermédiaire d'analyses chimiques et biologiques. En plus, nous avons effectué des observations biologiques, concernant leur efficacité à l'égard des plantes adventices presentes dans cet essai.