Transition moment directions of some important in-plane vibrations of uracil,thymine and cytosine. A fixed partial charge model calculation

Transition moment directions for the double-bond region vibrations of uracil, thymine and cytosine are calculated using the fixed partial charge model approximation. The coupling between the two carbonyl bonds and the carbon—carbon double bond in uracil and thymine is sensitive to the choice of the corresponding stretching force constants. The transition moment directions are correspondingly changed, thus, in principle, enabling the quantitative determination of coupling between the vibrations from linear dichroism measurements.     

Die Anzahl von Lösungen gewisser diophantischer Gleichungen

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Zur Axiomatik endlicher Gruppen

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Miniatyrisering av elektronikkomponenter

The paper describes the main features of the miniaturization technique used for production of circuit elements. Integrated circuits (microblocks) are believed to dominate in the near future, while micro-circuits produced by thin-film-technique, and discrete active and passive components should be much less frequent. The influence of the miniaturization on the size and the speed of computers is particularly stressed.     

Nucleic acid-metal interactions. III. Complexes of Ag(I) with adenine and 1-methyladenine from studies of UV and IR dichroic spectra

Attempts to characterize nucleic acid-silver interactions raise questions about how the free nucleic acid bases interact with silver ions in dilute aqueous solution. Studies of ultraviolet and infrared dichroism lead to the conclusion that with silver(I) ions in dilute solution adenine forms linear polymers, whereas 1-methyladenine forms dimers. The composition and structure of the complexes are further discussed against the background of the spectroscopic results.