Sökning: "auxiliary group"

Visar resultat 1 - 5 av 19 avhandlingar innehållade orden auxiliary group.

  1. 1. Some New Methods in Sialic Acid Chemistry

    Författare :Teddy Ercegovic; Centrum för analys och syntes; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; thioglycoside promoter; ganglioside; Tumor-associated antigen; lactam; lactone; sialic acid; N-acetylneuraminic acid; Neu5Ac; sialyl donor; auxiliary group; 3- S -phenylthio; bis-sialic acid lactam; 3- S -phenylseleno; silver trifluoromethanesulfonate; iodine monochloride; Organic chemistry; Organisk kemi;

    Sammanfattning : Gangliosides (G) are sialic acid-containing cell surface glycosphingolipids capable of forming lactones, i.e. inner esters. Some gangliosides are tumor-associated antigens, and they may serve as immunogens in their lactone form, where the latter is comparatively more abundant on the surface of malignant cells. LÄS MER

  2. 2. La negazione nell'italiano degli svedesi : sequenze acquisizionai e influssi translinguistici

    Författare :Camilla Bardel; Italienska; []
    Nyckelord :HUMANIORA; HUMANITIES; transfer from L2 to L3.; code-mix; copula; auxiliary; agreement; tense; verb morphology; ellipsis; focus; finiteness; negation; Swedish L1; Italian L2; Italian; Second language acquisition; transfer from L1; Italian language and literature; Italienska språk och litteratur ;

    Sammanfattning : This thesis concerns the development of negation in the Italian L2 of a group of Swedish adults who live in Italy and acquire the language by formal and spontaneous learning. Various negative expressions and the verbal system were studied in a longitudinal analysis of a corpus with 29 recordings of seven subjects. LÄS MER

  3. 3. Acyl-CoA thioesterases : auxiliary enzymes in peroxisomal lipid metabolism

    Författare :Maria A K Westin; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :;

    Sammanfattning : Peroxisomes are small organelles essential for life, which carry out a variety of functions mostly related to lipid metabolism, including α- and β-oxidation as well as the first steps of plasmalogen biosynthesis. Peroxisomal β-oxidation metabolizes many different lipids including very long-chain fatty acids, dicarboxylic fatty acids, branched-chain fatty acids, eicosanoids and certain xenobiotic fatty acids. LÄS MER

  4. 4. Samarium(II)-mediated Reactions in Organic Synthesis - Method Development and Mechanistic Investigation

    Författare :Tobias Ankner; Göteborgs universitet; Göteborgs universitet; Gothenburg University; []
    Nyckelord :Samarium II iodide; reduction; single electron transfer; nitro group reduction; mechanistic study; bond cleavage; deoxygenation; additives; toluenesulfonyl deprotection; defluorination.;

    Sammanfattning : This thesis describes the development of methods using divalent samarium reagents in organic synthesis. The main focus is placed on functional group reductions, but reductive formation of carbon-carbon bonds has also been investigated. LÄS MER

  5. 5. Cooperative Breeding in the Southern Anteater-Chat : Sexual Disparity, Survival and Dispersal

    Författare :Jonathan Barnaby; Jan Ekman; Anssi Laurila; Rita Covas; Uppsala universitet; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; Southern anteater-chat; Myrmecocichla formicivora; cooperative breeding; social evolution; behavioural ecology; delayed dispersal; family living; Africa; Biologi med inriktning mot populationsbiologi; Biology with specialization in Population Biology;

    Sammanfattning : Group-living sets the scene for complex social behaviours such as cooperative breeding, and exploring the factors that shape group-living is crucial in understanding these behaviours. This thesis explores the ecology of a population of the facultative cooperative breeding southern anteater-chat (Myrmecocichla formicivora), a group-living bird species endemic to southern Africa. LÄS MER