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- Nilsson, Anna, 1974-
(författare)
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Identification and Syntheses of Semiochemicals Affecting Mnesampela privata and Trioza apicalis
- 2009
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Licentiatavhandling (övrigt vetenskapligt/konstnärligt)abstract
- The Autumn gum moth, Mnesampela privata (Lepidoptera: Geometridae) is an endemic Australian moth whose larvae feed upon species of Eucalyptus. The moths favorite host plants are E. globulus and E. nitens which are the most important species used in commercial plantations of the Australian pulpwood industry. The autumn gum moth has become one of the most significant outbreak insects of eucalyptus plantations throughout Australia. As a consequence great financial losses to the forest industry occur. Today insecticides such as pyrethroids are used for control of eucalyptus defoliators as M. privata. The carrot psyllid, Trioza apicalis (Homoptera: Psylloidea), is one of the major pests of carrot (Daucus carota) in northern Europe. The psyllid causes curling of the carrot leafs and reduction of plant growth. Today the carrot crops are protected with the pyrethroid insecticide cypermethrin, which is toxic to aquatic organisms and is, from 2010, prohibited for use in Sweden by the Swedish Chemicals Inspectorate. An alternative to insecticides is to protect the seedlings with semiochemicals, a chemical substance or mixture of them that carries a message. This thesis describes the identification and the syntheses of semiochemicals from the above mentioned insect species. From analysis of abdominal tip extracts of M. privata females from Tasmania a blend of (3Z,6Z,9Z)-3,6,9-nonadecatriene and (3Z,6Z,9Z)-3,6,9-heneicosatriene was identified as the sex pheromone of this species. The identification of the C19- and C21-trienes was confirmed by synthesis. In the analysis of carrot leaf extracts we found a compound, α-cis-bergamotene, that induces antennal response in the carrot psyllid. This is just the beginning of the studies of trying to manipulate this psyllid with semiochemicals instead of insecticides.
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| 2. |
- Nilsson, Emma, 1982-
(författare)
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Sociala konstruktioner i förskolans planeringssamtal : I en landsgränsnära förskola
- 2016
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Licentiatavhandling (övrigt vetenskapligt/konstnärligt)abstract
- The overall aim of this study is to describe the preschool setting that is constructed in the preschool teacher’s planning conversations with a special focus on the border context in which this particular preschool is located. In what ways are the geographic location noticeable and what conceptions are established in their conversations? The study has a social constructivist approach and is informed by borderland theory which means that the focus is on the context and the participants in this context. The staff's experience is, however, seen as historically and culturally influenced by the context. With the support of borderland theory the study explores how the preschool´s borderland location has relevance to the social construction in the preschool studied.This research project is an observation study of a two- sectionpreschool in Sweden close to the Norwegian border which started in the spring of 2013. The preschool teachers were observed in staff meetings, all together and in smaller groups. The target group consists of educators and other staff. The Swedish ethical guidelines for research on children have been observed in all respects.The result shows how the staff of the researched preschool construct themselves as a unified us as opposed to them, not in terms of national borders, but in relation to their joint decisions on what they share and have in common and on who do not – the others.Keywords:Preschool, kindergarten, preschool teachers, border/national border, staff meetings/planning conversations, curricula and constructions/social construction
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