Browsing by Issue Date, starting with "2007"
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- Effect of arsenic, lead and zinc on seed germination and plant growth in black nightshade (solanum nigrum l.) vs. clover (trifolium incarnatum l.)Publication . Marques, Ana P. G. C.; Rangel, António O. S. S.; Castro, Paula M. L.S. nigrum was found to proliferate in sediments with high levels of metal pollution. Toxicity tests were performed using seed germination, root elongation, shoot length and biomass as parameters for establishing growth inhibition of S. nigrum and T. incarnatum by arsenic, lead and zinc. All the elements had a higher inhibitory action on the ger-mination and growth of T. incarnatum – inhibition occur-ring at 3 mg element per kg of dry sand. S. nigrum presented germination and growth at higher concentrations of those elements - 7 mg Pb kg-1, 10 mg Zn kg-1 and 10 mg As kg-1. Although inhibitory concentrations for each plant were dif-ferent, increasing the elements concentration reduced seed germination, root elongation and shoot length in T. incar-natum, but not always in S. nigrum. For the latter, low con-centrations (3 mg kg-1 dry sand) of Zn and As seemed to have stimulatory effects on germination. The addition of nu-trients did not cause a significant (P < 0.05) difference in the germination of both plants, except for high metal/ metal-loid concentration in S. nigrum. Concerning growth char-acteristics, nutrient addition was only a differentiation factor for shoot length at low metal/metalloid concentrations. S. nigrum could be a promising plant to be used in further ex-periments concerning the potential of phytoremediation of metal contaminated sites, as long as an adequate planting strategy is followed.
- Sequential injection determination of nitrate in vegetables by spectrophotometry with inline cadmium reductionPublication . Oliveira, Sara M.; Lopes, Teresa I. M. S.; Rangel, António O. S. S.A sequential injection system for the determination of nitrate (NO3 2) in vegetables was developed to automate this determination, allowing for substantially reduced reagent consumption and generated waste using low-cost equipment. After extraction with water and filtration, the extracted nitrate is reduced inline to nitrite in a copperized cadmium (Cd) column and determined as nitrite. According to the Griess–Ilosvay reaction, nitrate is diazotized with sulfanilamide and coupled with N-(1-naphtyl)-ethylenediamine dihydrochloride to form a purple-red azo dye monitored at 538 nm. Nitrate can be determined within a range of 1.35–50.0 mg L21 of NO3 2 (corresponding to 0.270–10.0 g of NO3 2 per kg of vegetable), with a conversion rate of nitrate to nitrite of 99.1+0.8%. The results obtained for 15 vegetable extracts compare well with those provided by the classical procedure, with a sampling throughput of 24 determinations per hour and relative standard deviations better than 1.2%.
- Evaluation of different substrates in constructed wetlands planted with Typha latifolia for the treatment of tannery wastewaterPublication . Calheiros, Cristina S. C.; Rangel, António O. S. S.; Castro, Paula M. L.
- Salicórnia como produto fermentado: desenvolvimento de condições óptimas para um processo controladoPublication . Raposo, M. F. de J; Silva, J. V.; Neri, M.; Morais, R. M.
- O que é a Vida Humana? Antropologia e desenvolvimento biomédicoPublication . Moltmann, Jürgen
- Mistério da fé para a salvação do mundoPublication . Azevedo, António Augusto
- Which way to bishopric? : origin and careers of polish bishops in the 13th centuryPublication . Maciejewski, JacekThe paper on the Polish episcopacy of the 13th century aims at giving a brief characterization of the career pattern, which readily lead to the office of ordinary bishop in the ecclesiastical province of Gniezno, between 1180 and 1320. Focusing on the specific social, territorial and institutional factors supporting Episcopal promotion, it also considers the issue of the importance of secular authority influence.
- A autonomia das escolas e a regulação sócio-comunitária da educaçãoPublication . Azevedo, Joaquim
- A liturgia em BragaPublication . Carvalho, Joaquim Félix de«A liturgia em Braga» é um excerto da dissertatio ad doctoratum defendida em Junho de 2007, no Pontifício Instituto Litúrgico Santo Anselmo, em Roma, sobre o estudo e edição do ms. 870 do Arquivo Distrital de Braga. Os termos a quo e ad quem deste pontifical de luxo brácaro-romano foram fixados em 1485-1516. Confeccionado para o Arcebispo de Braga, o códice era por ele usado quando se deslocava à catedral para celebrar as principais solenidades do ano litúrgico. O presente texto corresponde à primeira parte do capítulo IIº, dedicado ao estudo histórico, tanto na perspectiva diacrónica como sincrónica. Os resultados da sua aplicação revelam que a história da liturgia nesta Igreja particular é complexa, e que os factores de evolução são predominantemente exógenos. As descontinuidades inorgânicas introduzidas nos livros impressos ao longo do séc. XVI, em grande parte ignoradas até ao momento, são disso prova clara e permitem ajustar o conhecimento desta liturgia local.
- Virulence genes amongst strains of L. monocytogenes isolated from cheesesPublication . Almeida, Gonçalo; Teixeira, Paula; Hogg, Tim