No description available.

Mémoire numérisé par la Direction des bibliothèques de l'Université de Montréal.

Submitted by JUAN CAMILO CIFUENTES ARENAS null (jccifuen@gmail.com) on 2017-08-20T22:26:16Z No. of bitstreams: 1 Tese_Juan_Camilo_Cifuentes_Arenas.pdf: 3235857 bytes, checksum: 09f86c9212a38b12988810c2eb30b9c0 (MD5) / Approved for entry into archive by Luiz Galeffi (luizgaleffi@gmail.com) on 2017-08-24T12:32:17Z (GMT) No. of bitstreams: 1 cifuentesarenas_jc_dr_jabo.pdf: 3235857 bytes, checksum: 09f86c9212a38b12988810c2eb30b9c0 (MD5) / Made available in DSpace on 2017-08-24T12:32:17Z (GMT). No. of bitstreams: 1 cifuentesarenas_jc_dr_jabo.pdf: 3235857 bytes, checksum: 09f86c9212a38b12988810c2eb30b9c0 (MD5) Previous issue date: 2017-06-26 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) / O huanglongbing (HLB), associada a bactérias de floema (Candidatus Liberibacter spp) transmitidas por insetos (Diaphorina citri), é a doença mais destrutiva dos citros e muitos têm sido os esforços visando reduzir sua disseminação nos pomares, porém, nem sempre bem-sucedidos. Somente no cinturão citrícola paulista mais de 45 milhões de plantas já foram erradicadas por causa do HLB. O objetivo deste trabalho foi investigar diferentes aspectos associados ao patossistema HLB, visando trazer informações que ajudem na contenção da doença. Foram estudados: 1) hospedeiros alternativos do inseto vetor e do patógeno; 2) ontogenia do broto vegetativo de citros e seu potencial em multiplicar D. citri; 3) requerimentos térmicos para o desenvolvimento do broto; e 4) influência do porta-enxerto na biologia de D. citri. No primeiro capítulo é apresentada revisão de literatura sobre os aspectos mais relevantes da citricultura e do patossistema em estudo e, nos demais, os resultados das pesquisas. No segundo é apresentada a importância Swinglea glutinosa (rutácea muito comum em certas regiões citrícolas) como fonte de Ca. Liberibacter asiaticus e criadouro de D. citri. A bactéria do HLB multiplicou na planta, porém atingiu populações consideravelmente menores do que em laranjeira ‘Valência’. Apresenta, portanto, baixo potencial como fonte de inóculo para os citros. Por outro lado, D. citri reproduziu abundantemente em S. glutinosa, tanto quanto nas principais variedades de laranjeiras doces e limoeiros do grupo ‘Siciliano’ cultivados no Brasil. No terceiro capítulo são apresentados detalhes do desenvolvimento do broto em laranjeira ‘Valência’ e como os diferentes estádios influenciam o potencial biótico de D. citri. O inseto completou seu ciclo de vida em todos os estádios, mas em diferentes intensidades, sendo maiores nos estádios iniciais. Com os dados criou-se um índice de favorabilidade à reprodução do inseto, que leva em consideração o peso relativo de cada estádio do broto na biologia do inseto. No quarto capítulo é apresentado o impacto da temperatura do ar sobre o broto, o que permitiu determinar os graus-dia necessários ao seu desenvolvimento (GDD) e, com base no GDD, estabelecer um modelo geral inovador de previsão de pulverizações. No quinto capítulo é demonstrado que o porta-enxerto (limoeiro Cravo, tangerineira Sunki e citrumeleiro Swingle), por mecanismos de antibiose e/ou antixenose, afetam D. citri. Mas esses fenômenos ocorrem somente na fase de seedlings, e nas copas neles enxertadas somente enquanto a planta é jovem (muda). Em plantas adultas, de maior porte, tais fenômenos não foram detectados. Podem ter sido mascarados por influência da variedade copa (laranjeira). / Huanglongbing (HLB), associated with insect-borne phloem bacteria (Candidatus Liberibacter spp), is the most destructive disease of citrus and many efforts have been made to reduce its spread in orchards, but not always well-succeeded. Only in the citrus belt of São Paulo state (Brazil), more than 45 million plants have already been eradicated because of HLB. The objective of this work was to investigate different aspects associated to the HLB pathosystem, aiming to bring information that helps in the management of the disease. We studied: 1) alternative vector insect and pathogen hosts; 2) ontogeny of the citrus vegetative shoot and its potential to multiply D. citri; 3) thermal requirements for shoot development; and 4) influence of the rootstock on the biology of D. citri. In the first chapter, a literature review on the most relevant aspects of citriculture and pathosystem in study is presented and, in the others, the results of the experiments. In the second one the importance of Swinglea glutinosa (a Rutaceae very common in certain citrus regions) as a source of Ca. Liberibacter asiaticus and host for D. citri is presented. The HLB bacteria multiplied in the plant, but reached populations considerably smaller than in 'Valencia' sweet orange. Therefore, it presents low potential as a source of inoculum for citrus. On the other hand, D. citri reproduced abundantly in S. glutinosa, as well as in the main sweet orange and lemon varieties of the 'Sicilian' group cultivated in Brazil. In the third chapter, it is presented details of the development of the 'Valencia' orange new shoot and how the different stages influence the biotic potential of D. citri. The insect completed its life cycle at all stages of new shoots, but at different intensities, being larger in the early stages. With the data, an insect reproduction index was created, which takes into account the relative weight of each shoot stage in the insect biology. In the fourth chapter, it is presented the impact of the air temperature on the shoot, which allowed to determine the degree-days required for its development (GDD) and, based on the GDD, to establish an innovative general model of spray forecasting. In the fifth chapter it is demonstrated that the rootstock (‘Rangpur’ lime, ‘Sunki’ mandarin and ‘Swingle’ citrumelo), by mechanisms of antibiosis and / or antixenosis, affect D. citri. But these phenomena occur only in the stage of seedlings, and in the scions grafted on them only while the plant is young (nursery tree). In larger adult plants, such phenomena were not detected. They may have been masked by the influence of the scion (orange) variety.

Software testing plays an important role in the process of verifying software functionality and preventing bugs in production code. By writing automated tests using code instead of conducting manual tests, the amount of tedious work during the development process can be reduced and the software quality can be improved. This thesis presents the results of a conducted case study on how automated testing can be used when implementing new functionality in a Ruby on Rails web application. Different frameworks for automated software testing are used as well as test-driven development methodology, with the purpose of getting a broad perspective on the subject. This thesis studies common issues with testing web applications, and discuss drawbacks and advantages of different testing approaches. It also looks into quality factors that are applicable for tests, and analyze how these can be measured.

Mémoire numérisé par la Direction des bibliothèques de l'Université de Montréal.

No description available.

The flavour or fragrance of Basmati rice is associated with the presence of 2-acetyl-1- pyrroline. This work shows that a gene with homology to betaine aldehyde dehydrogenase (BAD) has significant polymorphisms in the coding region of fragrant genotypes relative to non fragrant genotypes. Accumulation of 2-acetyl-1-pyrroline in fragrant rice genotypes may be explained by the presence of mutations resulting in loss of function of the fgr gene product. The fgr gene corresponds to the gene encoding BAD2 in rice while BAD1 is encoded by a gene on chromosome 4. Development of an allele specific amplification (ASA) based around the deletion in the gene encoding BAD2 allows, perfect, simple and low cost discrimination between fragrant and non-fragrant rice varieties and identifies homozygous fragrant, homozygous non-fragrant and heterozygous non-fragrant individuals in a population segregating for fragrance. The cDNAs transcribed from rice chromosomes 4 and 8, each encoding an enzyme with homology to betaine aldehyde dehydrogenase were cloned and expressed in E. coli. The enzyme responsible for fragrance, encoded from chromosome 8, had optimum activity at pH 10, showed low affinity towards betaine aldehyde (bet-ald) with Km value of approximately 63ìM but a higher affinity towards -aminobutyraldehyde (GABald) with a Km value of approximately 9ìM. The enzyme encoded from chromosome 4 had optimum activity at pH 9.5 and showed generally lower affinity towards most substrates compared to the enzyme encoded from chromosome 8, substrate specificities suggest that the enzymes have higher specificity to aminoaldehydes and as such both should be renamed as an aminoaldehyde dehydrogenase (AAD). The inactivation of AAD2 (BAD2) in fragrant rice varieties likely leads to accumulation of its main substrate GABald which then cyclises to 1-pyrroline the immediate precursor of 2AP.

The flavour or fragrance of Basmati rice is associated with the presence of 2-acetyl-1- pyrroline. This work shows that a gene with homology to betaine aldehyde dehydrogenase (BAD) has significant polymorphisms in the coding region of fragrant genotypes relative to non fragrant genotypes. Accumulation of 2-acetyl-1-pyrroline in fragrant rice genotypes may be explained by the presence of mutations resulting in loss of function of the fgr gene product. The fgr gene corresponds to the gene encoding BAD2 in rice while BAD1 is encoded by a gene on chromosome 4. Development of an allele specific amplification (ASA) based around the deletion in the gene encoding BAD2 allows, perfect, simple and low cost discrimination between fragrant and non-fragrant rice varieties and identifies homozygous fragrant, homozygous non-fragrant and heterozygous non-fragrant individuals in a population segregating for fragrance. The cDNAs transcribed from rice chromosomes 4 and 8, each encoding an enzyme with homology to betaine aldehyde dehydrogenase were cloned and expressed in E. coli. The enzyme responsible for fragrance, encoded from chromosome 8, had optimum activity at pH 10, showed low affinity towards betaine aldehyde (bet-ald) with Km value of approximately 63ìM but a higher affinity towards -aminobutyraldehyde (GABald) with a Km value of approximately 9ìM. The enzyme encoded from chromosome 4 had optimum activity at pH 9.5 and showed generally lower affinity towards most substrates compared to the enzyme encoded from chromosome 8, substrate specificities suggest that the enzymes have higher specificity to aminoaldehydes and as such both should be renamed as an aminoaldehyde dehydrogenase (AAD). The inactivation of AAD2 (BAD2) in fragrant rice varieties likely leads to accumulation of its main substrate GABald which then cyclises to 1-pyrroline the immediate precursor of 2AP.

In this study we examine four Swedish newspapers’ visual coverage of the Tunisian and Egyptian uprisings in 2010 and 2011 – commonly known as the “Arab Spring Revolution”, the “Jasmine revolution” and in Sweden also the “Women’s revolution” – focusing on three main perspectives: news values and framing, postcolonialism, and gender. By means of a comprehensive content analysis and an in-depth semiotic analysis, the purpose of this study is to investigate how Swedish written media frames the revolution and its initiators and partakers through news photographs, headlines, lead paragraphs and photograph bylines, and to determine whether or not it reproduces earlier trends of media coverage and framing of non-Westerners and non-Western societies. The purpose of the extensive content analysis is to attain data for empirical research of the visual portrayal of the uprisings’ first twelve weeks in Sweden’s four largest newspapers Dagens Nyheter, Svenska Dagbladet, Aftonbladet and Expressen. The analysis reveals that episodic framing is regularly used in all four newspapers, and that media demonizes Tunisians and Egyptians by constructing them as a brutal, uncivilized and threatening group which almost exclusively consists of men, and whose members are neither quoted nor named. It also shows that women are symbolically annihilated by media and that the very few women who do occur are gender stereotyped in accordance with established media conventions and postcolonial tradition, with the interesting exception of women being quoted to a larger extent than men. The analysis furthermore confirms the low occurrence of female journalists in Swedish foreign reporting, as well as demonstrates that the gender of the journalists does not influence what types of stories are written or how they are framed. The variable frequencies obtained from the content analysis provide indicators which are subsequently explored in the semiotic analysis of four news photographs. The qualitative study establishes that the North African uprisings are represented and framed as being conducted by a group of angry, uncontrolled and unstoppable men. In conclusion, the results of this study indicates that Sweden’s four largest newspapers use a colonial discourse which threatens to establish and reproduce the idea of Tunisians and Egyptians as the Arabic “Others”.

No description available.