Sökning: "marks"
Visar resultat 1 - 5 av 217 avhandlingar innehållade ordet marks.
1. Relativa betyg : några empiriska studier och en teoretisk genomgång i ett historiskt perspektiv
Sammanfattning : Denna avhandling, som i huvudsak är resultatet av ett projekt finansierat av Skolöverstyrelsen, består av fem delstudier (I-V) utförda under åren 1977-1991 samt en sammanfattande analysdel (VI). Avhandlingens syfte är att studera det unika svenska relativa betygssystemet, som infördes på försök i folkskolan i början av 1940-talet för att senare permanentas och även införas i enhets- och grundskolan samt slutligen även i gymnasiet. LÄS MER
2. Glömda gudstecken : från fornkyrklig dopliturgi till allmogens bomärken
Sammanfattning : The pioneering academic research on Merchant Marks (also known as identity marks, personal marks, ownership marks, identification marks, Hausmarken, Hofmarken, Marques de Propriété, bomärken) was done by professor Homeyer (1870). Since 1870 there has been an ongoing debate among scholars whether Merchant Marks are simply formed by chance and coincidence, as stated by Rehnberg (1938, 1951), Scheffer (1957) and Nahlén (1992) or whether they are variations of Christian symbols, especially the cross, as stated by Sisson (1929) and Stevenson (1954). LÄS MER
3. Regulatory mechanisms in olfactory system assembly and function
Sammanfattning : The mammalian sense of smell relies on the detection of odorants by a large family of G protein coupled receptors, encoded by ~1300 different genes in mice (Buck and Axel, 1991; Zhang et al., 2007). These odorant receptors (ORs) are expressed in olfactory sensory neurons (OSNs) in the main olfactory epithelium (MOE). LÄS MER
4. Genital tract CD4+ T cells for vaccination and protection against Chlamydia trachomatis
Sammanfattning : Vaccination strategies for protection against sexually transmitted diseases (STDs) are lacking due to an incomplete understanding of genital tract T cell responses. This thesis dissects the generation of T helper subsets, including the recently discovered Th17 subset, during genital tract infection with a common sexually transmitted pathogen, Chlamydia trachomatis, and addresses vaccine requirements for the generation of genital tract CD4+ T cell immunity. LÄS MER
5. Experimental femtosecond-laser based investigations of model catalytic surface reactions
Sammanfattning : In order to be able to design novel catalytic processes more efficiently, detailed understanding of the catalyst-reactant interaction and the dynamics of the microscopic reaction steps is needed. The present thesis aims to contribute to the fundamental understanding of catalyst reactant systems by means of experiments using model systems in Ultra High Vacuum (UHV). LÄS MER