990 resultados para Hansen, Lars


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Samlingen med signum HB VIb finns vid huvudbiblioteket och innehåller litteratur om nationalekonomi till och med år 1999. Bankhistoriker ingår i denna samling. Vid Institutionen för samhällsekonomi och statistik finns dessutom en samling nationalekonomiskt litteratur. Nationalekonomisk litteratur har ingått i bokdonationer såväl från hemlandet som från Sverige. Bland donatorerna kan nämnas Gösta Söderholm, Lars Wasastjerna, J.V.Tallqvist och Tor von Wright. Samlingen har kompletterats med friexemplar som erhållits från 1919. Den nationalekonomiska litteraturen söks i Alma med sökfunktionen Signum och söktermen HB VIb. En del litteratur tryckt före 1980 skall sökas manuellt i huvudbibliotekets systematiska kortkatalog, men retroaktiv inmatning i Alma av litteratur tryckt mellan 1830 och 1979 pågår. Från och med år 2000 ingår den nationalekonomiska litteraturen vid huvudbiblioteket i en numerus currens-samling.

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Fungi and bacteria are key agents in plant litter decomposition in freshwater ecosystems. However, the specific roles of these two groups and their interactions during the decomposition process are unclear. We compared the growth and patterns of degradativeenzymes expressed by communities of bacteria and fungi grown separately and in coexistence on Phragmites leaves. The two groups displayed both synergistic and antagonistic interactions. Bacteria grew better together with fungi than alone. In addition, there was a negative effect of bacteria on fungi, which appeared to be caused by suppression of fungal growth and biomass accrual rather than specifically affecting enzyme activity. Fungi growing alone had a high capacity for the decomposition of plant polymers such as lignin, cellulose, and hemicellulose. In contrast, enzyme activities were in general low when bacteria grew alone, and the activity of key enzymes in the degradation of lignin and cellulose (phenol oxidase and cellobiohydrolase) was undetectable in the bacteria-only treatment. Still, biomass-specific activities of most enzymes were higher in bacteria than in fungi. The low total activity and growth of bacteria in the absence of fungi in spite of apparent high enzymatic efficiency during the degradation of many substrates suggest that fungi provide the bacteria with resources that the bacteria were not able to acquire on their own, most probably intermediate decomposition products released by fungi that could be used by bacteria

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Invocatio: Divina adfulgente gratia. Ded.: Gustavus Adolphus Humble, Olavus Osander, Andreas Eckerstedt, Peturs Kexerus, Andreas Ståhl, Sveno Fovelin, Samuel Lyseen, Henricus Bereen, Zacharias Tobiis, Lars Eckman [ruots. runo].

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Invocatio: [hepreaa].

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Invocatio: I.N.J.

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Invocatio: I.J.N.

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Invocatio: I.J.N.

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Invocatio: D.D.

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Invocatio: [Alpha et Omega].