Mostrando recursos 1 - 20 de 54

  1. XV Encontro Nacional de Educação em Ciências: livro de resumos

    A Escola Superior de Educação e Comunicação da Universidade do Algarve acolhe, em 2014, o XV Encontro Nacional de Educação em Ciências (XV ENEC). Sob o mote Tendências atuais em educação em ciências, o XV ENEC pretende constituir uma oportunidade de partilha e discussão de questões relacionadas com o ensino e aprendizagem, o desenvolvimento profissional de educadores e professores, o currículo e as políticas educativas, a relação entre a escola e a comunidade, a inovação didática e a formação em ciências físicas e naturais. Reconhecendo a importância das tecnologias educativas e o benefício da interação das ciências com outras áreas do conhecimento, convidamos, assim, ao diálogo entre...

  2. Contributo para a história da saúde no Algarve. Promontoria Monográfica História do Algarve 01

    Esta publicação pretende ser um contributo para a História da Saúde no Algarve. Desta forma organiza-se em torno de três temas: Instituições, onde cabe a análise dos primeiros hospitais de Faro, a Misericórdia e as Termas de Monchique, o Sanatório Vasconcelos Porto e os Centros de Assistência Social Polivalente; seguem-se as Personalidades com um olhar mais atento a três médicos, que por diferentes motivos, desempenharam um papel fundamental na região; e um último apartado de contribuições relacionadas com o arquivo do Sanatório, a acção, na área da saúde pública, de José de Beires, governador civil do Algarve, a relação entre...

  3. Catálogo do espólio documental de Joaquim Magalhães (1909-1999)

    Fidalgo, Andreia; Martins, Susana Calado
    Um acervo pessoal de natureza documental reflete sem qualquer sombra de dúvidas, a vivência e criatividade pessoais, profissionais e académicas do seu possuidor/autor. E um acervo pessoal com a dimensão e a diversidade do acervo do Dr. Joaquim Peixoto Magalhães é sem sombra de dúvida de uma riqueza intelectual assinalável

  4. X-ray computed (micro) tomography for detecting internal defects in fruit

    Verboven, Pieter; Tri Ho, Quang; Herremans, Els; Verlinden, Bert; Lammertyn, Jeroen
    Internal disorders in horticultural products are not revealed by external visual symptoms. Non-destructive and non-invasive monitoring techniques are required to detect the occurrence and investigate development of internal disorders. X-ray CT allows visualization and analysis of plant materials with a resolution down to a few micrometers, and without sample preparation or chemical fixation. X-ray tomography is based on X-ray radiography: an X-ray beam is sent on a sample and the transmitted beam is recorded on a detector. The level of transmission of these rays depends mainly on the mass density and mass absorption coefficient of the material. The resulting image is superimposed information (a projection) of...

  5. Non-destructive detection of internal defects in apple fruit by time-resolved reflectancespectrscopy

    Vanoli, Maristella; Rizzolo, Anna; Zerbini, Paola Eccher; Spinelli, Lorenzo; Torricelli, Alessandro
    In the present research Time-resolved Reflectance Spectroscopy (TRS) technique was tested to detect some internal defects in different apple cultivars. The absorption (μa) and the reduced scattering (μs’) coefficients were measured at different wavelengths in ‘Braeburn’ (mealiness), ‘Granny Smith’ (internal browning) and ‘Fuji’ (watercore) apples. Afterwards, each fruit of ‘Granny Smith’ and ‘Fuji’ were cut and evaluated for internal defects. ‘Braeburn’ apples were submitted to sensory analysis (firm, crispy, mealy and juicy), percent juice and relative intercellular space volume (RISV) determinations. In addition, for ‘Granny Smith’, the colour of the pulp was measured. ‘Granny Smith’ sound fruits on average showed μa750=0.029 cm-1 and μs’750=12.2 cm-1; with the...

  6. Foliar fertilization with potassium, magnessium and calcium and postharvest fruit quality in plums (prunus domestica l)

    Vangdal, Eivind; Flatland, Sigrid; Mehl, Ingvild
    Foliar applications of fertilizers are an important part of standard fertilization programmes in apples to optimize the content of nutrients important to growth and fruit quality. In an experiment in plums (Prunus domestia L.) a foliar fertilization programme was compared to traditional application of fertilizers on the soil. In another experiment extra magnesium, potassium and the combination of both magnesium and potassium were compared to control trees given a standard foliar fertilization programme. Yield and fruit size was registered. Analyses included fruit quality factors, content of major nutrients in fruits and leaves as well as storability. The effects of the different programmes on yield, fruit size...

  7. Inhibition of postharvest penicillium molds of oranges by antifungal hydroxypropyl methylcellulose-lipid edible composite films and coatings

    Valencia-Chamorro, Silvia A.; Pérez-Gago, María B.; del Río, Miguel A.; Palou, Lluís
    New hydroxypropyl methylcellulose (HPMC)-lipid edible composite films and coatings containing low-toxicity chemicals with antifungal properties were developed. Tested antifungal chemicals were mainly salts of organic acids, salts of parabens, and other compounds, most of them classified as food additives or generally recognized as safe (GRAS) compounds. Stand-alone edible films were used for in vitro evaluation of their antifungal activity against the pathogens Penicillium digitatum and Penicillium italicum by disk diameter tests. Selected edible coatings containing food preservatives were tested in vivo on ‘Valencia’ oranges to determine their curative (coated after fungal inoculation) and preventive (coated before fungal inoculation) activity to control citrus postharvest green and blue molds,...

  8. Variation in apple colour and maturity. causes and similarities over orchards, management, cultivars and storage

    Tijskens, L. M. M.; Herold, B.; Unuk, T.; Simcic, M.
    The colour of apples (flesh colour or skin colour) was assessed using the same individual apples repeatedly in time at three different locations, in several seasons for five different cultivars. Two experiments were conducted in the orchard, one experiment during postharvest storage. The same logistic model was applied to analyse the data, separate for each location and cultivar. Non linear mixed effects regression analysis allows to extract not only information on the kinetic parameters like reaction rate constant and potential greenness, but also on the variation present in the data. The rate constant of the decolouration process was found to be largely the same for all...

  9. How to analyse non-destructive data for biological variation

    Tijskens, L. M. M.; Schouten, R.E.; Konopacki, P.; Jongbloed, G.; Kessler, M.
    Biological variance is omnipresent. In animals, in humans, in biology, in sociology, medicine, you name it. In fact, life would be utterly boring without biological variation. Also in agricultural and horticultural produce, the ubiquitous variation causes a lot of trouble in dealing with the product in the supply chain. Basically, the majority of troubles and problems in the food production and supply chain is in one way or another related to the presence of variation between entities like individuals, up to batches, pallet loads, orchards and harvests, and down to cells and organelles. Many modern measuring techniques make it possible to analyse product entities without destroying...

  10. Is it possible to improve biocontrol agents to practical applications? the pantoea agglomerans CPA-2 example

    Teixidó, Neus; Cañamás, Teresa Paula; Torres, Rosario; Usall, Josep; Viñas, Inma
    A major hurdle in exploitation of biocontrol agents is the limited tolerance of fluctuating environmental conditions practically and the difficulties in developing a shelf-stable formulated product as effective as fresh cells. Most of microorganisms are very sensitive to drying processes involved in formulation and biological control is usually limited by the narrow range of conditions below microorganisms are able to survive, establish and effectively control pests and diseases. P. agglomerans cells grown at low water activities using NaCl exhibited osmotic adaptation and also demonstrated thermotolerance and desiccation tolerance after spray drying, freeze drying and fluidized bed drying. Different formulation strategies of P. agglomerans cells were tested in...

  11. Advances in practical management of pear ripening capacity and postharvest decay

    Sugar, David; Basile, Sally R.
    Most pear (Pyrus communis) cultivars are harvested when mature but do not have the capacity to ripen to a buttery-juicy texture without further postharvest conditioning, either with cold temperatures (“temperature conditioning”), ethylene exposure (“ethylene conditioning”) at 20 °C, or a combination of the two. It has been assumed that the length of temperature conditioning required to induce ripening capacity is characteristic of the cultivar, and that temperature conditioning is most efficient at normal storage temperatures (0 to -1 °C). At these temperatures, ‘Beurré Bosc’ pear is expected to need 15 days (d) of conditioning, ‘Doyenné’ du ‘Comice’ 30 d, and ‘Beurré d’Anjou’ 60 or more days....

  12. Nirs detection of moldy core in apples

    Shendery, Clara; Alchanatis, Victor; Ostrovsky, Visichlave; Weksler, Asya; Lurie, Susan; Schmilovitch, Ze’ev
    Moldy core of apples is undetectable until the fruit is cut or bitten into, it can therefore pose serious problems to both producer and consumer. Removal of diseased fruits prior to storage would be most desirable. The objective of this study was to evaluate the ability of VIS-NIR mini-spectrometers to detect moldy core in apples, on line. An apparatus which is qualified for online NIRS (near infrared spectrometry) measurements was developed based on off-the-shelf mini-spectrometers. ‘Top Red’ apples, were collected from several orchards before and during the commercial harvest, and were stored at 0°C pending the tests. The data were analyzed by chemometric procedures, specifically, by...

  13. Effect of postarvest elicitors on ‘fuyu’ persimmon quality during cold storage

    Sautter, Cláudia K.; Neuwald, Daniel A.; Sestari, Ivan; Saquet, Adriano A.; Rizzatti, Mara R.; Malmann, Carlos A.; Brackmann, Auri
    To induce resveratrol synthesis and reduce skin browning in ‘Fuyu’ persimmons, fruit were treated directly after harvest with the following elicitors: UV irradiation, ozone, phosphonate, or acibenzolar-S-methyl and then kept for three months at -0.5 °C in air storage at around 95% relative humidity. Traces of transresveratrol were detected in the skin of the persimmons at harvest, but after treatment and cold storage this compound was not found. After shelf-life (storage plus 5 d at 20 °C), the soluble solids content (SSC), reducing and non-reducing sugars and total polyphenols were not significantly influenced by any of the elicitor treatments. Fruit treated with ozone showed a higher...

  14. Effects of nitrogen fertilization on fruit quality during storage of spanish ‘piel de sapo’ melon

    Sánchez-Bel, Paloma; Flores, Francisco B.; Martínez-Madrid, María Concepción; Martínez-Tébar, Elena; Cabello, María Jesús; Castellanos, María Teresa; Ribas, Francisco; Romojaro, Félix
    The aim of the work is the evaluation of the effect of nitrogen fertilization on fruit quality during postharvest conservation at low temperatures. Melon cultivation was fulfilled at open air with a plastic mulch and drip irrigation (100% of crop evapotranspiration). Nitrogen fertilization was applied at 0, 50, 100 and 150 kg N ha-1. Melon fruits were harvested at 48-50 d (days) after fruit set, and stored at 9±1 ºC and 85 % RH during 10, 20 and 30 d. After each period of conservation colour, firmness, soluble solids, vitamin C and total nitrogen contents from pulp tissue were analysed. The % fruit weight loss...

  15. Cracked green table olive from the south of Portugal: the influence of diferent brining conditons

    Rodrigues, Neusa; Cavaco, Teresa; Quintas, Célia
    In the south of Portugal, cracked green olives represent a traditional way of processing table olives. After harvesting and sorting, the olives are washed, broken and immediately brined (Process A) or submitted to various washing steps with water prior to brining (Process B). The objective of this work was to study the effect of different processing treatments on the evolution of microbiological and physicochemical parameters during the fermentation of cracked green olives at a homemade scale and at different temperatures (25 ºC, room temperature and 18 ºC). Yeasts were found to be the dominant group in fermented cracked green table olives. Process A originated brines without...

  16. Antifungal activity of citrus essential oil components in vitro and in vivo against penicillium digitatum pers. (sacc.)

    Rodov, V.; Nafussi, B.; Burns, P.; Ben-Yehoshua, S.
    In vitro studies were conducted on 37 compounds present in citrus essential oil, to test their activity against Penicillium digitatum by three methods: agar diffusion, amended growth medium and vapor assay. The aliphatic alcohols 1-nonanol, 1-decanol and especially 1-octanol exhibited the highest activities, as assayed by all the methods used. The terpenoid compounds perillalcohol, perillaldehyde, citral, terpineol, carveol and citronellol, as well as the reference aromatic compound cinnamaldehyde also exhibited high activity against P. digitatum. Neither hydrocarbons nor esters inhibited this fungus. The mode of action of 1-octanol, perillaldehyde, citral, perillalcohol and terpineol against P. digitatum was fungicidal, whereas 1-decanol, 1-nonanol, carveol and citronellol were only fungistatic....

  17. Sugar variation in healthy, blue mold infected and aureobasidium pullulans treated ‘rocha’ pear

    Ramalho, J. C.; Pais, Isabel P.; Silva, M. J.
    Proceedings of the International Conference “Environmentally friendly and safe technologies for quality of fruit and vegetables”, held in Universidade do Algarve, Faro, Portugal, on January 14-16, 2009. This Conference was a join activity with COST Action 924.

  18. Investigation on the essential mineral element contentents of cultivated and wild blueberry fruits in latvia

    Pormale, Jolanta; Osvalde, Anita; Karlsons, Andis
    Wild blueberry (Vaccinium murtillus) is one of the most popular wild-harvested fruit in Latvia, traditionally used in folk-medicine and food. Unfortunately there are wide fluctuations in yields. The recent years mark a tremendous boom in high-bush blueberry (Vaccinium corymbosum) cultivation in Latvia. As the total berry production increase, blueberries have found a place in a daily intake as excellent source of antioxidants, dietary fibber, vitamin C and minerals. Thus, the chemical composition of Vaccinium spp. has important implication on human health. The aim of this study was to compare the contents of twelve biologically essential elements (N, P, K, Ca, Mg, S, Fe, Mn, Zn, Cu,...

  19. Heat treatment evaluation on quality and safety of whole tomato (lycopersicum esculentum l.) fruits

    Pinheiro, Joaquina; Alegria, Carla; Abreu, Marta; Fernandes, Isabel; Gonçalves, Elsa M.; Silva, C. L. M.
    Quality and safety attributes, like colour (CIELab parameters), texture (Maximum force – MF), total phenolics content (TPC), peroxidase activity (POD), microbial count and moulds & yeasts (Log10 cfu g-1) were determined on heat treated mature-green tomatoes at temperature ranging of 40 to 50 ºC and different times. Heat treatments (HT) did not affect significantly (p>0.05) the tomatoes colour. In terms of texture, a reduction of 10% MF was observed at 50 ºC_15min...

  20. Consequences of iron deficiency on fruit quality in citrus and stawberry

    Pestana, M.; Varennes, Amarilis de; Miguel, Maria Graça; Correia, P. J.
    Iron deficiency (iron chlorosis) is an important nutritional disorder in several plants, including fruit trees and strawberry. Iron chlorosis does not result from a small level of iron in soils but rather from impaired acquisition and use of this metal by plants. Calcium carbonate, present in great amounts in calcareous soils, and the resulting large levels of bicarbonate ions, are the main causes of iron deficiency. Countries in southern Europe, such as Portugal, Spain, Italy and Greece, have large areas of calcareous soils with established orchards, where iron chlorosis is a major factor that limits yield and profit for the farmer. Iron chlorosis affects several metabolic...

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