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The macrocyclic ring interconversion of four maleonitrile mixed oxadithia crown ethers of variable ring size, mn-12-S2O2, mn-15-S2O3, mn-18-S2O4 and fn-12-S2O2, were studied by 1H and 13C NMR spectroscopy and by molecular modelling. The barriers to ring interconversion were estimated using variable temperature NMR spectroscopy and from the calculated activation energies, together with the spin-lattice relaxation times of the CH2 carbon atoms, conclusions were drawn regarding the intramolecular flexibility of the crown ethers in both the free state as well as the complexed state incorporating either AgI, BiIII, SbIII, PdII or PtII metal cations. Furthermore, both the stoichiometry of the complexes and the coordination sites of the crown ethers to the various cations were also clearly implicated. Molecular modelling was also utilised to ascertain the preferred conformers of the four compounds and their corresponding complexes, the results of which corroborated the experimental NMR results to a high degree.
The perceived risks and benefits of genetically modified food products : Experts versus consumers
(1999)
Tieken-Boon van Ostade, I. (Hrsg.), Two Hundred Years of Lindley Murray; Münster, Nodus, 1996
(1998)
At the suggestion of the then editor of 'Studia Celtica Japonica,' Professor Toshio Doi, this bibliography lists the returns of a questionnaire sent to all scholars in Germany who were actively involved in Celtic Studies between 1980 and 1995. They were asked to list all their publications in the field of Celtic Studies, so as to allow to carry out a survey of their research activities during this period. While most scholars kindly obliged by returning their lists, there were notable exceptions who never answered the query. Regretably, the present bibliography therefore contains important gaps, which, however, may be quite telling as far as the research situation in Germany was concerned during that period.
The great Old English epic 'Beowulf' has been dated to practically every century between the 6th and the 11th century, depending on the criteria of dating adopted and the approaches advocated by the respective scholars. As the text successfully avoids to provide definite cues or evidence for a definitive date, these scholarly attempts reveal more about the respective scholars' research interests than offering uncontroversial dates. The point of dating 'Beowulf' then seems to provide scholars with the opportunity to anchor their own personal understanding of the poem within the century of their own personal predilection.
DO in Contact?
(1997)
Periphrastic English constructions involving the verbs BE/HAVE + a nominalised verb form expressing [+imperfectivity] and [+perfectivity] have close analogues in the Insular Celtic languages, where Celtic analogues of the English verb BE + a prepositional construction marker + Verbal Noun are used. The two constructions in English and teh Celtic languages are not identical and cannot be so, because the Celtic languages do not feature present and past participles and English has no verbal nouns. But the two types of the periphrastic mode of expressing aspect are close enough to suggest either a shift scenario, a borrowing scenario and/or an areal spread by diffusion over a long period of time. Since Old English did not mark aspect, neither morphologically nor syntactically, but Old Welsh and Old Irish already did so syntactically, it is suggested here that a unilateral transfer process was involved here, which proceeded from the Celtic languages to the English language. Aspectual transfer is even more pronounced in the so-called 'Celtic Englishes,' where in addition to the periphrastic marking of [+ imperfectivity] and [+perfectivity] the marking of [+habituality] is a grammaticalised feature and is periphrastically expressed.