Vegetais minimamente processados: uma revisäo / Vegetables minimally processed: a review

O processamento mínimo tem sido descrito como a manipulaçäo, preparo, embalagem e distribuiçäo de produtos agrícolas, através de procedimentos como a seleçäo, limpeza, lavagem, descascamento e corte, que näo afetem suas características organolépticas e agreguem valor aos mesmos, resultando em produtos naturais, práticos, cujo preparo e consumo requer menos tempo, atendendo as exigências da vida moderna. A finalidade dos alimentos minimamente processados e refrigerados é proporcionar ao consumidor um produto parecido com o fresco, com uma vida útil prolongada, garantindo segurança e mantendo a qualidade nutritiva e sensorial. Entre os fatores limitantes da vida útil de vegetais minimamente processados, incluem-se o aumento da respiraçäo e da produçäo de etileno, escurecimento enzimático, descoloraçäo da superfície, perda de água e alteraçöes microbiológicas. O objetivo é apresentar uma revisäo sobre vegetais minimamente processados, enfocando sua definiçäo, preparo, distribuiçäo e principais alteraçöes fisiológicas e microbiológicas que os mesmos sofrem.

Germination ecology of bunium persicum [Bois] fedtsch and ferula oopoda [Boiss and Buhse] boiss

The study revealed that Bunium persicum seeds had 70% germination at 5 °C, while those of Ferula oopoda had 100% germination at 10 °C. Stratification improved the rate of germination in both the species. The germination of Bunium persicum improved [80-86% when treated with dry air or ethylene gas. Treating seed with acetone, ether, alcohol, soaking in cold and boiling water and application of KNO3, and thiourea did not improve germination in both the cases. Seed stored for 2 years exhibited 96-100% germination in each case. The germination was 40% in B. persicum seeds in sandy clay loam, while F. oopoda gave 100% germination in sandy clay loam and silt loam and 80% in loamy sand and clay loam soils. The germination of both these species generally decreased with increasing sowing depth and soil dryness as they appear to be stenothermal as far as their germination is concerned

Qualidade do broto de bambu Dendrocalamus giganteus Munro esterilizado comercialmente / Quality of bamboo shoots Dendrocalamus giganteus Nunro comercially sterelized

Estudou-se o efeito de diversas combinaçöes de tempo e temperatura do processo de esterilizaçäo comercial na qualidade de porçöes apicais de broto de bambu Dendrocalamus giganteus Munro cozidas por 120 minutos em tacho aberto

Effect of mode of application of some growth regulators on the physiology of tomato plants: IV-effect of nicotinamide on the endogenous hormonal contents

Application of 10, 40 and 80 ppm nicotinamide either to culture media or used as foliar spray of tomato plants caused stimulatory effects on growth, development, differentiation and fruiting of plants in the order 80 > 40 > 10 ppm, as already mentioned in paper 3 offered simultaneously by the same authors to the same journal. This was accompanied with regular increases in the contents and levels of auxins, gibberellins and cytokinins leading to hormonal balance. However, the IAA oxidase activity was progressively reduced by the increase in the concentration of nicotinamide used. These results safely coordinate with the previously mentioned results in the third paper of this series

Plant growth, metabolism and adaptation in relation to stress conditions. XIII comparative effects of salinity on the activity of certain enzymes in both french bean and maize plant

activity of certain enzymes in both french bean and maize plant Changes in the specific activity of 8 respiratory enzymes were measured in the extracts of seedlings, whole plants and of leaves during growth on Hoagland media supplemented or not with increaseing concertrations of Na2 SO4 The Different Enzymes Appeared to respond differently to salinity in seedlings, whole plants and leaves of both Phaseolus vulgaris and Zea mays. The present results may therefore be explained on the basis of differential effects of salinity on the different enzymes in the various tissues studied

Regeneración in vitro y aplicaciones a través del cultivo de células y tejidos vegetales / In vitro regeneration and applications though vegetables of cells and tissues culture

Plant cells by measns of their titopotency and aided by in vitro culture techniques can be induced to perform morphogenesis leading to somatic embryoids and massive clonal multriplication; microspore or pollem can be triggered to tecover haploid plants, then characters expressed via haploidy can be selected and fixed. Protoplasts from different species can lead to recombinations. We report here work done con Carica pubescens, where somatic embryoids were obtained from cells; in Prunus avium androgenesis leading to pollem calli was triggered, while plants were recovered from Nicotiana tabacum anthers. Fusion products were obtained using C. pubescens and C.papaya protoplasts, leading up to calli and shoots