Este trabalho de dissertação foca o sistema criptográfico de McEliece. Este é um sistema criptográfico de chave pública que tira partido do facto do problema de descodificação de um código linear geral ser NP-completo. Mais especificamente, este sistema criptográfico usa um código de Goppa sobre um corpo finito como chave privada, para o qual existe um algoritmo de descodificação eficiente, e um código linear g...
RICOVER ; Giant reed (Arundo donax) is a tall perennial grass widespread throughout the Mediterranean region. Despite its use to make musical instrumentals, building material, erosion control, windbreak, and renewed interest in bioenergy production it become a major invasive weed problem in watersheds because of its high competitive ability. Here, the biology and identification of giant reed and related specie...
Trials in complete casual blocks subdivided in the time to compare the behaviour of 3 imported seed-potato cultivars – ‘Diamant’, ‘Romano’, ‘Picasso’ – and 3 regional cultivars – ‘Tchigembo’, ‘Kanjangala’, ‘Boa nova regional’ –, planted in two dates on rain season (October and February) and in a third date (June), in dry season, with irrigation. The trials were repeated in three locals of the Huambo country – B...
Plant species richness in the Cape Verde archipelago is examined relative to island eco-geographical factors. Species-area and species-area-habitat relationships are analysed using the classical species-area model and the recently proposed species-choros model. The number of Xoristic zones (used to estimate the choros parameter) provides an adequate estimate of the potential habitat diversity, and the species-c...
Seed germination of bensulfuron-methyl resistant (R) and susceptible (S) Alisma plantagoaquatica biotypes collected in rice fields from Baixo Mondego (6 samples); Sorraia river valey (2 samples) and Sado river valey (2 samples) were compared at 15 ºC and 15/30 ºC. All seed samples were two years old and an extra sample three years old was also included to assess the effect of seed age on germination. Three year...
The repetitive use of bensulfuron-methyl in rice fields from Sorraia, Sado and Mondego river valleys had selected resistant (R) populations of Alisma plantago-aquatica in Portugal, identified as So306, So307, Sa88, Mo190; Mo260, respectively. The response of R-biotypes to bensulfuron-methyl at 26 days after seeding (DAS) and 42 DAS and the cross-resistance either to ALS- inhibitors or to herbicides with other m...
A comparative analysis of the growth of Lupinus albus grown in stands in mixture with annual weeds and in stands without weeds (with herbicide) was carried out on a field trial with two large plots. The measurements taken at every two weeks include some parameters wich characterize the growth of above ground L. albus individual plants (height, number of leaves, number of plants/unit area, total dried weight and...
Trichogramma cacoeciae MARCHAL, poderá ser um potencial controlador de Lobesia botrana DEN & SCHIFF. Cerca de 350 000 Trichogramma / ha foram largados por cada geração da traça-da-uva em vinhas do Bombarral e Santarém. Os resultados obtidos são promissores apesar da fraca densidade da praga nos últimos anos. ; ABSTRACT: The Trichogramma cacoeciae MARCHAL may be a potential controller of Lobesia botrana DEN & S...
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