Investigations on the host-parasite interface of a mycoparasite system /

The cell wall composition of Choanephora cucur - bitarum and the host-parasite interface, after infection with Piptocephalis virginiana , were examined in detail. The cell walls of C_. cucurbitarum were determined to be composed of chitin (17%), chitosan (28.4%), neutral sugars (7.2%),uronic acid (2.4%), proteins (8.2%) and lipids (13.8%). The structure of hyphal walls investigated by electron microscopy of shadowed replicas before and after alkali-acid hydrolysis, showed two distinct regions: microfibrillar and amorphous. The microfibrils which were composed of mainly chitin, were organized into two distinct layers: an outer, thicker layer of randomly orientated microfibrils and an inner, thin layer of parallel microfibrils.Electronmicrographs of the host-parasite interface of C_. cucurbitarum and the mycoparasite , P_. virginiana , 30 h following inoculation, showed that the sheath zone has a similar electron density to that of the host cell wall. The sheath was not present around the young (18 h old) haustorium. High-resolution autoradiographs of infected host hyphae showed that radioactive N-acetyl-D-glucosamine , a precursor of chitin, was incorporated preferentially in the host cell wall and sheath zone. Cell fractionation of label fed hyphae showed that 84% of the label was present in the cell wall and specifically in the chitin portion of the wall. The antifungal antibiotic, Polyoxin D, a specific inhibitor of the enzyme, chitin synthetase, suppressed the incorporation of the label in the cell wall and sheath zone and resulted in a decrease in electron density of the developing sheath. The significance of these results is discussed in the light of host resistance.

Is more information always good? : investigating the impact of website interface features on e-retailer's sales performance

A number of frameworks have been suggested for online retailing, but still there exists little consensus among researchers and practitioners regarding the appropriate amount of information critical and essential to the improvement of customers' satisfaction and their purchase intention. Against this backdrop, this study contributes to the current practical and theoretical discussions and conversations about how information search and perceived risk theories can be applied to the management of online retailer website features. This paper examines the moderating role of website personalization in studying the relationship between information content provided on the top US retailers' websites, and customer satisfaction and purchase intention. The study also explores the role played by customer satisfaction and purchase intention in studying the relationship between information that is personalized to the needs of individual customers and online retailers' sales performance. Results indicate that the extent of information content features presented to online customers alone is not enough for companies looking to satisfy and motivate customers to purchase. However, information that is targeted to an individual customer influences customer satisfaction and purchase intention, and customer satisfaction in tum serves as a driver to the retailer's online sales performance.

Competing and Conflicting Land Uses at the Rural-Urban Interface: Understanding the Impacts of Residential Development on Agricultural Landscapes

Rural communities are currently undergoing rapid restructuring as globalization impacts the future viability of many small towns. Agricultural regions throughout Canada, in particular, Niagara-on-the-Lake, are forced to adapt to changes within the industry. In addition to these challenges, sprawling residential developments from nearby urban centres are changing the dynamic of this town, resulting in conflicts between the residential and agricultural land uses. This thesis explores these conflicts from the perspective of the residents and the farmers. It was found that the initial sources of conflict related to noise-generating farm activities are no longer a concern, while the use of pesticide have become a source of contention among the residents. The farmers, alternately, were found to be proactive and strived to limit the potential for conflict with adjacent residents. Lastly, it was determined that planning legislation aggravates land use conflicts within Niagara-on-the-Lake and need to better address these land use conflicts.

Percepción del adolescente sobre la influencia de los padres en su salud.

Tesis (Maestría en Enfermería con Especialidad en Salud Comunitaria) UANL

Impacto de la orientación proporcionada a padres de niños con enfermedad de membrana hialina : Monterrey, Nuevo León, 1990.

Tesis (Maestría en Enfermería con Especialidad en Salud Comunitaria) UANL

Estrés de padres en la unidad de cuidados intensivos neonatales.

Tesis (Maestría en Enfermería con Especialidad en Materno Infantil: Pediatría) UANL

Apoyo de padres y autocuidado en adolescentes para prevención de VIH

Tesis (Maestría en Ciencias en Enfermería) UANL

Apoyo de padres y conductas sexuales para prevención de VIH

Tesis (Maestría en Ciencias de Enfermería con Énfasis en Salud Comunitaria) UANL

Apoyo de padres y conducta sexual preventiva para VIH

Tesis (Maestría en Ciencias de Enfermería con Enfasis en Salud Comunitaria) UANL

Comunicación y creencias sexuales de padres de adolescentes

Tesis (Maestría en Ciencias de Enfermería con Enfasis en Salud Comunitaria) UANL

Percepciones y expectativas de padres de familias indígenas en torno a la educación escolar de sus hijos : las familias huastecas de la Fernando Amilpa, en la Z.M.M.

Tesis (Maestría en Ciencias con Orientación en Trabajo Social) UANL.

Influencia de los padres en la elección de carrera desde la perspectiva del estudiante universitario

Tesis (Maestría en Ciencias con Especialidad en Orientación Vocacional) U.A.N.L.

Autoeficacia en comunicación sobre temas de sexo de padres a hijos

Tesis (Maestría en Ciencias de Enfermería con Enfásis en Salud Comunitaria) U.A.N.L., Facultad de Enfermeria, 2006.

Propiedades algebraicas de la percepción que tienen los padres y maestros de personas con discapacidad intelectual acerca de su sexualidad.

Tesis (Maestría en Ciencias con Orientación en Cognición y Educación) UANL, 2010.

Influencia de las creencias de padres en la comunicación acerca de sexo con sus hijos adolescentes.

Tesis (Maestría en Ciencias de Enfermería con Énfasis en Salud Comunitaria) UANL, 2012.