Fast and simple separation quantification of organic from inorganic chlorine in water by solid-phase extraction molecular absorption spectrometry.

We have investigated photosensitizing properties for porphrazine and eleven of its related derivatives based on time-dependent density functional theory (TD-DFT) calculations. The modles have been divided into two categories based on the existence of CN functional group in one category but not in the other one. The other functional groups include H, CH3, F, CF3, C6H5, and C6F5 counterparts. The...

The present study prepares alkali lignin (AL) via acidification of black liquor, obtained from a pulp and paper factory. The average molecular weight of AL (equal to 2,530 g/mol) has been determined with gel permeation chromatography. AL has been modified by ethylene glycol, while lignin nanoparticles (LN) has been prepared through acid precipitation technology, their size being assessed by mea...

The aim of the present study is to clarify the absorption mechanism of a drug from the kidney surface membrane in rats. We studied the absorption characteristics of phenolsulfonphthalein (PSP) and other compounds with different molecular weights after their application to the rat kidney surface in vivo, employing a cylindrical diffusion cell (i.d. 6 mm, area 0.28 cm(2)). The time course of free...

CONTENTS Introduction Ultraviolet and Visible Spectroscopy Nature of Electronic Transitions Principles of Absorption Spectroscopy Spectral Measurements Solvent Effects Applications of Electron Spectroscopy Commercial Applications of UV and Visible Spectroscopy Infrared Absorption Spectroscopy Hooke’s law and Absorption of Radiations Modes of Molecular Vibrations Other Factors influencing Vibrat...

We report the detection of broad (FWHM 270 km s) H I z 21 cm absorption toward the compact (,15 h pc) radio nucleus of the nearby powerful radio galaxy Cygnus A. The absorption corresponds to a column density of hydrogen atoms of at least 2.54H 0.44 3 10 Tspin cm. Observations of OH and H2CO yielded upper limits. While other possibilities exist, we argue that the observed H I absorption plausib...

A real-time time-dependent density functional theory coupled with the classical electrodynamics finite difference time domain technique is employed to systematically investigate the optical properties of hybrid systems composed of silver nanoparticles (NPs) and organic adsorbates. The results demonstrate that the molecular absorption spectra throughout the whole energy range can be enhanced by ...

We present a detailed analysis of narrow Na i and K i absorption resonance lines toward nearly 40 T Tauri stars in Taurus with the goal of clarifying their origin. The Na i 5889.95 Å line is detected toward all but one source, while the weaker K i 7698.96 Å line in about two thirds of the sample. The similarity in their peak centroids and the significant positive correlation between their equiv...

We report the infrared (IR) absorption spectra of different conformational isomers of gas phase amino acid molecules in the molecular fingerprint region of 330-1500 cm(-1). The IR absorption spectra for three conformers of the amino acid tryptophan show absorption bands that uniquely identify the conformational structure of the molecule and that are well matched by density functional theory cal...