Facteurs agro-environnementaux associés à la résistance antimicrobienne d'Escherichia coli dans l'eau potable des puits du sud de l'Ontario

Mémoire numérisé par la Division de la gestion de documents et des archives de l'Université de Montréal

L'impact de l'infiltration lymphocytaire sur le pronostic de l'adénocarcinome du pancréas

L’objectif principal de cette étude est de déterminer la valeur pronostique de l’infiltrat lymphocytaire dans l’adénocarcinome du pancréas. Les densités des lymphocytes T CD3+, CD4+, CD8+, FOXP3+ et CD45RO+ intratumoraux (T) et péritumoraux (PT) de 111 spécimens ont été mesurées avec des micromatrices tissulaires. Un Index Lymphocytaire (IL) a été créé basé sur les valeurs des CD4+ T, CD8+ PT et le ratio CD3+ T/PT regroupant les patients selon que les tumeurs présentaient aucune (IL---), 1 à 2 (IL+/-) ou les 3 caractéristiques immunitaires favorables (IL+++). La survie médiane des patients atteints d’un cancer du pancréas est significativement différente selon la catégorie d’index lymphocytaire; elle était de 14 mois pour IL---, de 19 mois pour IL +/- et de 29 mois pour IL+++ (p=0,01). L’IL est un facteur indépendant de survie en analyse multivariée ainsi que la différenciation tumorale et l’utilisation d’un traitement adjuvant. L’IL est un facteur pronostique de survie des adénocarcinomes du pancréas réséqués et devrait pouvoir permettre une meilleure classification des patients.

Studies on Landfill Leachate Transportation and Its Impact on Soil Characteristics

Leachate from an untreated landfill or landfill with damaged liners will cause the pollution of soil and ground water. Here an attempt was made to generate knowledge on concentrations of all relevant pollutants in soil due to municipal solid waste landfill leachate and its migration through soil and also to study the effect of leachate on the engineering properties of soil. To identify the pollutants in soil due to the leachate generated from municipal solid waste landfill site, a case study on an unlined municipal solid waste landfill at Kalamassery has been done. Soil samples as well as water samples were collected from the site and analysed to identify the pollutants and its effect on soil characteristics. The major chemicals in the soil were identified as Ammonia, Chloride, Nitrate, Iron, Nickel, Chromium, Cadmium etc.. Engineering properties of field soil samples show that the chemicals from the leachate of landfill may have effect on the engineering properties of soil. Laboratory experiments were formulated to model the field around an unlined MSW landfill using two different soils subjected to a synthetic leachate. The Maximum change in chemical concentration and engineering property was observed on soil samples at a radial distance of 0.2 m and at a depth of 0.3 m. The pollutant (chemicals) transport pattern through the soil was also studied using synthetic leachate. To establish the effect of pollutants (chemicals) on engineering properties of soil, experiments were conducted on two types soils treated with the synthetic chemicals at four different concentrations. Analyses were conducted after maturing periods of 7, 50, 100 and 150 days. Test soils treated with maximum chemical concentration and matured for 150 days were showing major change in the properties. To visualize the flow of pollutants through soil in a broader sense, the transportation of pollutants through soil was modeled using software ‘Visual MODFLOW’. The actual field data collected for the case study was used to calibrate the modelling and thus simulated the flow pattern of the pollutants through soil around Kalamassery municipal solid waste landfill for an extent of 4 km2. Flow was analysed for a time span of 30 years in which the landfill was closed after 20 years. The concentration of leachate beneath the landfill was observed to be reduced considerably within one year after closure of landfill and within 8 years, it gets lowered to a negligible level. As an environmensstal management measure to control the pollution through leachate, permeable reactive barriers are used as an emerging technology. Here the suitability of locally available materials like coir pith, rice husk and sugar cane bagasse were investigated as reactive media in permeable reactive barrier. The test results illustrates that, among these, coir pith was showing better performance with maximum percentage reduction in concentration of the filtrate. All these three agricultural wastes can be effectively utilized as a reactive material. This research establishes the influence of leachate of municipal solid waste landfill on the engineering properties of soil. The factors such as type of the soil, composition of leachate, infiltration rate, aquifers, ground water table etc., will have a major role on the area of influence zone of the pollutants in a landfill. Software models of the landfill area can be used to predict the extent and the time span of pollution of a landfill, by inputting the accurate field parameters and leachate characteristics. The present study throws light on the role of agro waste materials on the reduction of the pollution in leachate and thus prevents the groundwater and soil from contamination

Uncover the Concealed Link: Gender & Ethnicity-Divided Local Knowledge on the Agro-Ecosystem of a Forest Margin

This research is a study about knowledge interface that aims to analyse knowledge discontinuities, the dynamic and emergent characters of struggles and interactions within gender system and ethnicity differences. The cacao boom phenomenon in Central Sulawesi is the main context for a changing of social relations of production, especially when the mode of production has shifted or is still underway from subsistence to petty commodity production. This agrarian change is not only about a change of relationship and practice, but, as my previous research has shown, also about the shift of knowledge domination, because knowledge construes social practice in a dialectical process. Agroecological knowledge is accumulated through interaction, practice and experience. At the same time the knowledge gained from new practices and experiences changes mode of interaction, so such processes provide the arena where an interface of knowledge is manifested. In the process of agro-ecological knowledge interface, gender and ethnic group interactions materialise in the decision-making of production and resource allocation at the household and community level. At this point, power/knowledge is interplayed to gain authority in decision-making. When authority dominates, power encounters resistance, whereas the dominant power and its resistance are aimed to ensure socio-economic security. Eventually, the process of struggle can be identified through the pattern of resource utilisation as a realisation of production decision-making. Such processes are varied from one community to another, and therefore, it shows uniqueness and commonalities, especially when it is placed in a context of shifting mode of production. The focus is placed on actors: men and women in their institutional and cultural setting, including the role of development agents. The inquiry is informed by 4 major questions: 1) How do women and men acquire, disseminate, and utilise their agro ecological knowledge, specifically in rice farming as a subsistence commodity, as well as in cacao farming as a petty commodity? How and why do such mechanisms construct different knowledge domains between two genders? How does the knowledge mechanism apply in different ethnics? What are the implications for gender and ethnicity based relation of production? ; 2) Using the concept of valued knowledge in a shifting mode of production context: is there any knowledge that dominates others? How does the process of domination occur and why? Is there any form of struggle, strategies, negotiation, and compromise over this domination? How do these processes take place at a household as well as community level? How does it relate to production decision-making? ; 3) Putting the previous questions in two communities with a different point of arrival on a path of agricultural commercialisation, how do the processes of struggle vary? What are the bases of the commonalities and peculiarities in both communities?; 4) How the decisions of production affect rice field - cacao plantation - forest utilisation in the two villages? How does that triangle of resource use reflect the constellation of local knowledge in those two communities? What is the implication of this knowledge constellation for the cacao-rice-forest agroecosystem in the forest margin area? Employing a qualitative approach as the main method of inquiry, indepth and dialogic interviews, participant observer role, and document review are used to gather information. A small survey and children’s writing competition are supplementary to this data collection method. The later two methods are aimed to give wider information on household decision making and perception toward the forest. It was found that local knowledge, particularly knowledge pertaining to rice-forest-cacao agroecology is divided according to gender and ethnicity. This constellation places a process of decision-making as ‘the arena of interface’ between feminine and masculine knowledge, as well as between dominant and less dominant ethnic groups. Transition from subsistence to a commercial mode of production is a context that frames a process where knowledge about cacao commodity is valued higher than rice. Market mechanism, as an external power, defines valued knowledge. Valued knowledge defines the dominant knowledge holder, and decision. Therefore, cacao cultivation becomes a dominant practice. Its existence sacrifices the presence of rice field and the forest. Knowledge about rice production and forest ecosystem exist, but is less valued. So it is unable to challenge the domination of cacao. Various forms of struggles - within gender an ethnicity context - to resist cacao domination are an expression of unequal knowledge possession. Knowledge inequality implies to unequal access to withdraw benefit from market valued crop. When unequal knowledge fails to construct a negotiated field or struggles fail to reveal ‘marginal’ decision, e.g. intensification instead of cacao expansion to the forest, interface only produces divergence. Gender and ethnicity divided knowledge is unabridged, since negotiation is unable to produce new knowledge that accommodates both interests. Rice is loaded by ecological interest to conserve the forest, while cacao is driven by economic interest to increase welfare status. The implication of this unmediated dominant knowledge of cacao production is the construction of access; access to the forest, mainly to withdraw its economic benefit by eliminating its ecological benefit. Then, access to cacao as the social relationship of production to acquire cacao knowledge; lastly, access to defend sustainable benefit from cacao by expansion. ‘Socio-economic Security’ is defined by Access. The convergence of rice and cacao knowledge, however, should be made possible across gender and ethnicity, not only for the sake of forest conservation as the insurance of ecological security, but also for community’s socio-economic security. The convergence might be found in a range of alternative ways to conduct cacao sustainable production, from agroforestry system to intensification.

Influence of farmers educational level on comprehending, acting-upon and sharing of agro advisories

Although short messaging service (SMS) through mobile phones has quickly gained popularity among most other sectors in India, its potential is not fully realised in the agriculture sector as a cost effective service to reach farmers and elicit desirable action. Despite the cost effectiveness, mobile messaging has remained a challenge in the farming sector in terms of its end use and action as far as extension systems are concerned. While there could be many influencing factors affecting the utility of mobile messages, this study assumed that educational level of farmers could be a major factor. A telephone survey was conducted to ascertain the influence of farmers’ education on the level of utilisation of mobile-based advisories. Farmers with higher education level showed better comprehension of advisories, actedupon the advisories more promptly and shared the information with fellow farmers more often than those with lower education level. There was a significant association between comprehending, sharing and acting upon advisories. This has implications to achieve enhanced extension reach with higher efficiency in terms of cost and time.

Meat yield and quality of Tanzania Shorthorn Zebu cattle finished on molasses/maize grain with agro-processing by-products in 90 days feedlot period

This study was conducted to evaluate the effects of feeding molasses or maize grain with agro-processing by-products on yield and quality of meat from Tanzania shorthorn zebu (TSZ) cattle. Forty five steers aged 2.5 to 3.0 years with 200 +/- 5.4 kg body weight were allocated into five dietary treatments namely hominy feed with molasses (HFMO), rice polishing with molasses (RPMO), hominy feed with maize meal (HFMM), rice polishing with maize meal (RPMM) and maize meal with molasses (MMMO). Ad libitum amount of each dietary treatment and hay were offered to nine steers for 90 days. Cooking loss (CL) and Warner Bratzler shear force (WBSF) values were determined on M. longissimus thoracis et lumborum aged for 3, 6, 9 and 12 days. Steers fed on HFMO diet had higher (P < 0.05) nutrient intake (86.39 MJ/d energy; 867 g/d CP), weight gain (919 g/d) and half carcass weight (75.8 kg) than those fed other diets. Meat of steers from all diets was tender with average WBSF values of 47.9 N cm^(−2). The CL (22.0 +/- 0.61%) and WBSF (53.4 +/- 0.70 N cm^(−2)) were highest in meat aged for 3 days followed by 6, 9 and 12 days. WBSF values for meat aged for 9 and 12 days from steers fed HFMO and RPMM diets were similar and lower than those on other dietary treatments x aging periods. Overall, molasses and hominy feed can be used to replace maize meal in feedlot finishing diets to spare its use in animal feeds.

Los medios de comunicación (Cambio y Semana) como mecanismo de accountability social. Un análisis del escándalo de Agro Ingreso Seguro. Período 2009 - 2011.

Dentro del marco de la Rendición de Cuentas, los medios de comunicación han logrado convertirse en destacados mecanismos de accountability social, puesto que para ello se requiera visibilidad y los medios son la herramienta más útil para lograr este objetivo. Un ejemplo de estos procesos de visibilidad y accountability es el escándalo generado alrededor del programa gubernamental Agro Ingreso Seguro, principal tema de análisis de la presente monografía.

La regulación agraria en Colombia o el eterno déjà vu hacia la concentración y el despojo: un análisis de las normas jurídicas colombianas sobre el agro (1991-2010)

Este artículo plantea que el diseño institucional contenido en las normas jurídicas sobre propiedad agraria, en el período 1991-2010 no tiene como fundamento la distribución de la tierra y que, por el contrario, incentiva o permite la concentración de la misma; esto, distanciándose de las tesis que aborda el problema de la tierra como una consecuencia de la indebida aplicación de las normas que regulan el tema rural. Además, en materia de propiedad agraria, la Constitución de 1991, a pesar de su sesgo garantista y de haber cambiado un sinnúmero de estructuras sociales y políticas, en el tema de propiedad de la tierra conservó la estructura decimonónica y liberal clásica de los derechos de propiedad regulados en el Código Civil. Si bien los fenómenos de la concentración y el despojo de la tierra no se pueden explicar únicamente desde la variable de la norma jurídica, esta sí puede arrojar indicios sobre dichas situaciones. Así las cosas, se realizará un análisis desde las normas jurídicas para determinar si, desde su diseño, existen elementos que hayan contribuido a la concentración y al despojo de la tierra en Colombia.

La captura del estado vista desde los procesos de formulación e implementación de la política pública agro ingreso seguro. Periodo 2007-2009

RESUMEN En esta monografía el interés es comprender la dimensión de la captura del estado, su complejidad y cómo ha penetrado en la cultura política institucional de nuestro país; así mismo, el análisis permite entender el grado de influencia de los grupos de poder para lograr leyes y regulaciones a favor suyo en detrimento del interés general. Este trabajo aborda dicho fenómeno en los procesos de formulación e implementación de la política pública de Agro Ingreso Seguro – AIS– y explica consecuencias y efectos de la captura del Estado en su gobernabilidad y eficacia social. Para ello se desarrolló una investigación de tipo documental que permitió identificar el grado de legitimación de los propósitos de la política pública poniendo en perspectiva la intervención de agentes capturadores en el proceso de implementación de la política Agro Ingreso Seguro.

Identificación y análisis de las oportunidades de exportación de productos agrícolas y agro-industriales potenciales desde Colombia hacia Estados Unidos - periodo de estudio: 2003 a 2012

Una de las mayores brechas que tienen los empresarios colombianos es la falta de información sobre las opciones de exportación hacia otros países, especialmente con Estados Unidos siendo uno de los principales socios comerciales que tiene Colombia. Por esta razón el presente trabajo de investigación se propuso identificar y analizar las oportunidades de exportaciones de productos agrícolas y agro-industriales potenciales desde Colombia hacia Estados Unidos en el periodo de 2003 hasta 2012. Después de contextualizar el entorno de los dos países así como el del sector agrícola de cada uno de ellos; se procedió a la selección de diez sub-partidas arancelarias a través de las bases de datos de TRADE MAP y UN COMTRADE. Con base en los resultados observados, se eligieron los dos productos agrícolas o agro-industriales potenciales para la exportación hacia Estados Unidos; adicionalmente se exploró el Tratado de Libre Comercio con dicho país para reconocer las ventajas, beneficios y oportunidades que este acuerdo generó en los productos seleccionados. Por lo tanto se concluye que Estados Unidos influye significativamente en las relaciones tanto comerciales como financieras a nivel mundial. En el caso de Colombia ha alcanzado resultados positivos en la balanza comercial, niveles óptimos de inversión y crecimiento de la economía comercial. Finalmente se puede afirmar que el Tratado de Libre Comercio entre los dos países promueve el ingreso preferencial de manera permanente, genera mayor estabilidad, competitividad en el largo plazo y acceso a mercados al agilizar los procesos normativos de los productos agrícolas y agro-industriales.

Propuesta de una estructura asociativa que apoya a la producción y fortifique las cadenas agro productivas del tomate de árbol (Cyphomandra betacea) en el Ecuador

La presente investigación establece una propuesta de estructura asociativa que apoya a la producción y fortifica las cadenas agro productivas del tomate de árbol en Ecuador, para lo cual se recopiló información relevante acerca de planificación estratégica, desarrollo territorial y enfoques asociativos para marcar la base conceptual que fundamentó la propuesta final. Se realizó el diagnóstico del sector mediante el análisis PEST, para conocer cómo pueden influenciar los factores Políticos, Económicos, Sociales y Tecnológicos en la propuesta final de esta investigación. También se analizó a la industria, mediante el análisis de las cinco fuerzas de Porter para comprender la interacción de las fuerzas competitivas y se identificó y caracterizó a todos los actores de la cadena agro productiva del tomate de árbol. Finalmente se analizaron casos exitosos sobre asociatividad desarrollados en Ecuador y Colombia, con la finalidad de extraer aspectos convergentes, divergentes y factores clave de éxito. La información recopilada sirvió de base para realizar la propuesta final, la cual determinó dos enfoques asociativos como los más adecuados para una iniciativa como la planteada, los cuales son los negocios inclusivos y empresa ancla. Finalmente se identificó a Pichincha como la provincia que presenta mejor ubicación estratégica para poder desarrollar esta propuesta.