Mid-infrared spectroscopy is essential for chemical identification and compositional analysis because of the existence characteristic molecular absorption fingerprints. However, it very chall...

We show that optical properties of linear molecular aggregates undergo drastic changes when aggregates are deposited on a metal surface. The dipole-dipole interactions of monomers with their images can result in strong restructuring of both the exciton band and the absorption spectrum, depending on the arrangement of the monomer transition dipoles with respect to the surface. 1 Introduction Mol...

in this study, the effect of soluble chitosan, thyme oil and linseed oil on the mold resistance of wood and its surface properties was investigated. both low and medium molecular weight chitosan with concentration of 1 and 2% were used. cypress wood samples with dimensions of 20 × 20 × 70 mm and moisture content of 12% were saturated by the preservatives. the results showed that the maximum abs...

QSO absorption spectra provide an extremely useful probe of possible cosmological variation in various physical constants. Comparison of H i 21 cm absorption with corresponding molecular (rotational) absorption spectra allows us to constrain variation in y ≡ α2gp where α is the fine structure constant and gp is the proton g-factor. We analyse spectra of two QSOs, PKS1413+135 and TXS 0218+357, a...

Conventional matrix characterization by visible spectrophotometry technique required sample destruction and limited to drug content assay. This study investigated the capacity of visible spectrophotometry technique to characterize both drug content and molecular characteristics of solid nifedipine-hydroxypropylmethylcellulose films stored at 25 and 50 % relative humidities in their intact form....

The ultrasonic absorption of aqueous solutions of salmon sperm deoxyribose nucleic acid (DNA), molecular weight of the order of 106, was determined as a function of pH in the neutral and acidic regions over the frequency range 5-50 MHz at 25øC. Tile viscous relaxation frequencies appear to be well below 1 MHz. At neutral pH values, viscosity and molecular conformation appear to contribute littl...

A systematic first-principles analysis of the energy level scheme and absorption spectrum of Cr4+ in Rb2CrF6 crystal is presented. The recently developed first-principles approach to the analysis of the absorption spectra of ions in crystals based on the discrete variational multi-electron (DV-ME) method was used in the calculations. The method is based on the numerical solution of the Dirac eq...

We report the detection of H I 21-cm absorption in the z = 0.96 early-type lensing galaxy towards MG J0414+0534 with the Green Bank Telescope. The absorption, with total NHI = 1.6 × 10 (Ts/f) cm, is resolved into two strong components, probably due to the two strongest lens components, which are separated by 0.4. Unlike the other three lenses which have been detected in H I, J0414+0534 does not...

A double lumen jejunal perfusion technique has been used in man to study the effect of peptide chain length on absorption of amino acid nitrogen from two partial enzymic hydrolysates of lactalbumin. Copper-chelation chromatography showed that one lactalbumin hydrolysate (LH2) contained 98% peptides with a chain length greater than 4, whilst the other (LH1) contained a more even spread of chain ...