Showing papers in "Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy in 2009"

TL;DR: This report is a report on extracellular synthesis method for the preparation of Au, Ag and Au-Ag nanoparticles in water, using the extract of Volvariella volvacea, a naturally occurring edible mushroom, as reducing and protecting agents.

TL;DR: The ability to modulate the shape of nanoparticles as observed in this study for gold nanoparticles opens up the exciting possibility of developing further synthetic routes employing ecofriendly sources.

TL;DR: Intramolecular charge transfer responsible for the optical nonlinearity of the dye molecule has been discussed theoretically and experimentally and the first hyperpolarizability of the molecule is calculated.

TL;DR: The paper reports the pH controlled synthesis of silver nanoparticles using honey as reducing and stabilizing agents by adjusting the pH of the aqueous solution containing metal ions and honey, which is a significant advancement in biosynthesis.

TL;DR: The complexed flavonoid was much more effective free radical scavengers than the free flavonoids.

TL;DR: Some 170 organic pigments relevant to artist's paints have been collected from historic collections and modern manufacturers and comprises 118 different color indices (C.I.s).

TL;DR: New Schiff base (H(2)L) ligand is prepared via condensation of o-phthaldehyde and 2-aminophenol and is coordinated to the metal ions in a bi-negatively tetradentate manner with ONNO donor sites of the azomethine N and deprotonated phenolic-OH.

TL;DR: The presence of calcite in the natural blue pigments has been confirmed following Raman spectroscopy in specific areas of the samples, and micro-Raman and optical microscopy have further corroborated the presence of calcium inclusions in the samples of natural origin.

TL;DR: The conformational investigation showed that the presence of CGR resulted in the change of BSA secondary structure and induced the slight unfolding of the polypeptides of protein, which confirmed some micro-environmental and conformational changes of B SA molecules.

TL;DR: FT-NIR spectroscopy with supervised pattern recognition could be successfully applied to discriminate green tea according to geographical origins and experimental results showed that the performance of SVM model is the best among four models.

TL;DR: Aniline was polymerized under different experimental conditions like variation in time, temperature, monomer and concentration of initiators to counsel the thermal stability of poly(aniline) (PANI) structure.

TL;DR: Unfortunately, PM2 method could not predict vibrational frequencies and visible spectra of the azo dyes under conditions of this investigation.

TL;DR: All the macrocycles and macrocyclic Ru(II) complexes along with existing antibacterial drugs were screened for antibacterial activity against Gram +ve (Bacillus subtilis, Staphylococcus aureus) and Gram -ve (Escherichia coli, Klebsiella pneumonia) bacteria and were found to be more active when compared to streptomycin and ampicillin.

TL;DR: The composition of lipid extracts that were predicted by the PLS regression of IR spectra was compared with lipid quantification by thin layer chromatography and two lipid mixtures were prepared for training and validation of the quantification model.

TL;DR: The results indicate that care must be taken while using ThT as a probe for detecting amyloid fibrils, and its binding constant is comparable to many drugs that bind at domain II of HSA, like salicylate, warfarin, digitoxin, etc.

TL;DR: It was proved that the probable quenching mechanism of BSA by quinclorac was dynamic quenched and the alterations of protein secondary structure in the presence of QUC were confirmed by the evidences from three-dimensional fluorescence, synchronous fluorescence and CD spectroscopy.

TL;DR: The results suggest that at low concentrations, warfarin binds at the high-affinity sites (HAS), while low-Affinity binding sites (LAS) are occupied at higher concentrations.

TL;DR: Green colored samples on wall paintings and green powder from a pigment pot found in Pompeii area are investigated by micro-Raman, FT-IR and, for one sample, SEM-EDX.

TL;DR: It is demonstrated that by focusing a frequency-doubled 532 nm Nd:YAG pulsed laser beam with a 10x beam expander to a 529-microm diameter spot on a mineral surface located at 9 m, it is possible to measure simultaneously both the remote Raman and LIBS spectra of calcite, gypsum and olivine by adjusting the laser power electronically.

TL;DR: It is demonstrated that this spectral range - essentially devoid of absorption peaks of the common binder materials - can be well used for identification of inorganic pigments in paint samples thereby markedly extending the possibilities of pigment identification/confirmation by ATR-IR spectroscopy into the realm of pigments having no absorptions in the mid-IR region.

TL;DR: Although displaying lower spectral resolution comparing with the laboratory confocal instrument both portable instruments permit unambiguous detection of minerals in the field and designate portable Raman machines as excellent tools for field geological applications.

TL;DR: The interaction between the anti-diabetes Chinese medicine MA and BSA may provide some significant information for the mechanism of the traditional chinese medicine MA on the protein level to cure diabetes or other diseases.

TL;DR: In this paper, a dye-sensitized solar cells (DSSCs) with extracts of Canna indica L., Salvia splendens, Solanum nigrum L. as sensitizers is firstly reported.

TL;DR: The manifestations of NH-pi interactions and the influence of bulky chlorine and methyl group on the vibrational modes of the amino group are investigated.

TL;DR: The activity data show that the metal complexes to be more potent/antibacterial than the parent Shciff base ligand against one or more bacterial species.

TL;DR: The results provide a quantitative understanding of the effect of berbamine on the structure of bovine serum albumin, providing a useful guideline for further drug design.

TL;DR: Experimental results showed that Pt(II) complex bound to DNA by an intercalative mode of binding, which induces detectable changes in the CD spectrum of CT-DNA, an increase in T(m) value, and a increase in its viscosity.

TL;DR: The comparative vibrational analysis of the free ligand and its complexes gave evidence that flurbiprofen binds metal (II) through the carboxylate oxygen, and the coordination mode of the metal in both complexes was established.

TL;DR: The results revealed the presence of a single binding site on xanthine oxidase with the binding constant value equals to 1.321 J mol(-1) K(-1), indicating that both hydrogen binding and hydrophobic are involved in the interaction of this polyphenolic natural compound withxanthine oxidation.

TL;DR: A new bis(tridentate NO2) Schiff base ligand, H(4)L, was prepared by the reaction of the bifunctional carbonyl compound; 4,6-diacetylresorcinol (DAR) with ethanolamine to yield mono- and bi-nuclear complexes with different coordinating sites.