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Percorrer por autor "Rodrigues, D."

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  • Influence of citric acid, ascorbic acid and calcium lactate applications on the shelf life of minimally processed horticultural products
    Publication . Rodrigues, D.; Miguel, Maria Graça; Dandlen, S.; Nunes, S.; Antunes, Maria Dulce
    The market share of minimally processed fruits and vegetables has continuously increased in the past years due to consumer life style. These products have high expectations regarding quality and shelf-life. The objective of the present work was to evaluate the effect of additives applied externally after cutting in fresh-cut kiwifruit, pears, strawberries, tomatoes, and peppers. Fruit were washed in water, cut longitudinally in quarters and dipped in solutions of 2% citric acid, 2% ascorbic acid or 2% calcium lactate. Subsequently, fruit were packed in plastic trays, covered with 15 mu m thick polyethylene film and stored at 4 degrees C for 9 d. At intervals of 0, 3, 6 and 9 d, measurements of firmness and total phenolics content were performed. Calcium lactate was efficient in maintaining firmness in most fresh-cut fruit. Total phenolics content were higher in kiwifruit, strawberries and peppers than in pears and tomatoes. Ascorbic acid was the most efficient dip to maintain or increase the total phenolics content of the fresh-cut fruit studied.
    2010Artigo científico Acesso restrito Ver mais
  • Larval development and allometric growth of the black-faced blenny Tripterygion delaisi
    Publication . Solomon, F. N.; Rodrigues, D.; Gonçalves, E. J.; Serrão, E. A.; Borges, R.
    Larval development and allometric growth patterns of the black-faced blenny Tripterygion delaisi are described from a larval series (body length, L-B = 3.30-12.10 mm) caught by light traps at the Arrabida Marine Park, Portugal. Larvae of T. delaisi possess distinctive morphometric and meristic characteristics which can be used to identify this species from related taxa. Pigmentation is sparse but characteristic, consisting of pigmented eyes, gas bladder pigmentation in the dorsal region, anal pigmentation and a row of regularly spaced postanal ventral melanophores. This pattern is present from as early as the yolk-sac stage and persists throughout all stages with just the addition of head and caudal pigmentation during the flexion and postflexion stages, respectively. The majority of fin development (with the exception of the caudal fin), occurs in the later stages of development. Myomere counts range between 37 and 45 for all stages. Growth is allometric during larval development. When inflexion points of growth were detected, growth was found to be biphasic with the inflexion points occurring within a very narrow range of L-B (8.70-8.90 mm) close to the mean +/- S.D. (9.44 +/- 1.48 mm LB) of postflexion larvae. Considering allometric growth patterns and ontogenetic descriptions together, the first developmental phase includes the preflexion and flexion stage larvae, while the second phase characterises the postflexion larvae prior to the transition from larvae to juvenile. (C) 2017 The Fisheries Society of the British Isles
    2017-06Artigo científico Acesso aberto Ver mais