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Performic acid oxidation of exo-2-syn-7-bicyclo(2.2.1)hept-5-enediol (norborn-5-enediol) gives exo-3-exo-5-syn-7-tricyclo(184.108.40.206 2,6 )heptanetriol-(nortricyclenetriol), exo-2-endo-3-endo-5-syn-7-, exo-2-endo-3-endo5-anti-7- and exo-2-endo-3-exo-5-anti-7-bicyclo(2.2.1)heptanetetrols...
L'étude par spectroscopies d'absorption infrarouge et de diffusion Raman des quatre complexes (CO) 5 MNCNR 2 (M est Cr ou W; R est C 2 H 5 ou CH 3 ) et des deux ligandes libres diéthyl- et diméthyl-cyanamide, à 295 et 77 K, nous a permis d'attribuer les fréquences vibrationnelles observées...
The interaction between β-cyclodextrin (β-CD) and riboflavin together with its electrogenerated intermediate anion radicals has been specifically investigated by in situ electrochemical UV-visible spectroscopy. It appears that the anion radicals are included more tightly than the parents and...
The secondary structure of human very low density lipoproteins (VLDL) has been quantitatively examined by using Fourier transform infrared (FTIR) spectroscopy. Derivative spectroscopy was combined with band curve-fitting procedures to quantitate the spectral information from the amide I′ band....
A method for interpreting Raman intensities is proposed. Free from rotational contributions atomic polarizability tensors are transformed into quantities termed effective induced bond charges σ k . The new quantity is expected to be associated with polarizability properties of chemical bonds....
Magnetic circular dichroism (MCD) spectra were measured on chlorophylls in different aggregation states formed in organic solvents and in pigment-protein complexes. An index which reflects the magnetic dipole contribution of a specific transition is introduced, that is, a ratio of MCD intensity...
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