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- Bennich-Björkman, Li, et al.
(författare)
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A creative university: is it possible?
- 1991
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Ingår i: Studies of higher education and research, 1991:4. ; 1991:4
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Forskningsöversikt (refereegranskat)
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- Hermansson, Kersti, et al.
(författare)
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From Molecule to Cluster to Bulk - Water OH Vibrations in Different Surroundings
- 1992
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Ingår i: International Journal of Quantum Chemistry. - 0020-7608 .- 1097-461X. ; 42:5, s. 1251-1270
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Forskningsöversikt (refereegranskat)abstract
- Vibrational spectra for the O-H stretching motion of HDO molecules in different surroundings have been calculated by quantum mechanical ab initio methods and compared with experimental spectra. The free water molecule, water chains, and ion-water clusters are discussed. Solvent effects on OH vibrations in liquid water have been calculated as well as "in-crystal" OH frequencies in some ice and ionic crystalline hydrate structures. The importance of nonadditivity effects, electron correlation (at the MP2 level), and long-range interactions for the total frequency downshift is demonstrated. It is shown that the inclusion of these effects, in conjunction with a variational quantum mechanical treatment of the anharmonic vibrational stretching motion (force constants up to the fourth order), yields vibrational frequencies in quantitative agreement with experiment for a wide range of aqueous systems.
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4. |
- Pedersen, Karsten, 1952
(författare)
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The deep subterranean biosphere
- 1993
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Ingår i: Earth-Science Reviews. - 0012-8252. ; 34:4, s. 243-260
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Forskningsöversikt (refereegranskat)
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7. |
- Appelkvist, E L, et al.
(författare)
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Regulation of coenzyme Q biosynthesis
- 1994
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Ingår i: Molecular Aspects of Medicine. - 0098-2997 .- 1872-9452. ; 15:Suppl., s. 37-46
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Forskningsöversikt (refereegranskat)abstract
- The side-chain moiety of coenzyme Q is synthesized by a trans-prenyltransferase present in microsomes. Condensation of this moiety with the precursor ring takes place in the Golgi system. The enzymes involved, as well as the cytosolic geranylgeranyl-PP synthase, are regulated in an independent fashion. When the size of the farnesyl-PP pool is decreased or increased by employing appropriate inhibitors, the rate of CoQ synthesis is modified accordingly, indicating the dependence of trans-prenyltransferase activity on the level of intracellular substrate concentrations. Administration of peroxisome proliferators elevates CoQ concentrations not only in blood, but also in various tissues. Thus, it may be possible in the future to selectively increase CoQ concentrations in certain organs, without increasing the level of cholesterol.
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