Several Methodologies (several + methodology)

Distribution by Scientific Domains


Selected Abstracts


Wine waste treatment methodology

INTERNATIONAL JOURNAL OF FOOD SCIENCE & TECHNOLOGY, Issue 10 2006
Ioannis S. Arvanitoyannis
Summary As more than 20% of wine production is waste, the latter constitutes a serious environmental problem that has to be solved urgently. Several methodologies such as composting, aerobic and anaerobic digestion, thermophilic anaerobic digestion, electrodialysis, pyrolysis, ozonation and wet oxidation among others were launched in an effort to solve effectively the wine waste management. This review aims at presenting comparatively and critically the characteristics of the currently employed waste treatment methods (properties, advantages and disadvantages, effectiveness) in order to emerge (with the aid of numerous tables and figures) the most promising and effective method. [source]


Calculation of affinities of peptides for proteins

JOURNAL OF COMPUTATIONAL CHEMISTRY, Issue 3 2004
Serena Donnini
Abstract Several methodologies were employed to calculate the Gibbs standard free energy of binding for a collection of protein,ligand complexes, where the ligand is a peptide and the protein is representative for various protein families. Almost 40 protein,ligand complexes were employed for a continuum approach, which considers the protein and the peptide at the atomic level, but includes solvent as a polarizable continuum. Five protein,ligand complexes were employed for an all-atom approach that relies on a combination of the double decoupling method with thermodynamic integration and molecular dynamics. These affinities were also computed by means of the linear interaction energy method. Although it generally proved rather difficult to predict the absolute free energies correctly, for some protein families the experimental ranking order was correctly reproduced by the continuum and all-atom approach. Considerable attention has also been given to correctly analyze the affinities of charged peptides, where it is required to judge the effect of one or more ions that are being decoupled in an all-atom approach to preserve electroneutrality. The various methods are further judged upon their merits. © 2003 Wiley Periodicals, Inc. J Comput Chem 25: 393,411, 2004 [source]


Dual Chromophore-Nitroxides: Novel Molecular Probes, Photochemical and Photophysical Models and Magnetic Materials

PHOTOCHEMISTRY & PHOTOBIOLOGY, Issue 4 2007
Gertz I. Likhtenstein
Over the last decades scientists have faced growing requirements in novel methods of fast and sensitive analysis of antioxidant status of biological systems, spin redox probing and spin trapping, investigation of molecular dynamics, and of convenient models for studies of photophysical and photochemical processes. In approaching this problem, methods based upon the use of dual chromophore-nitroxide (CN) compounds have been suggested and developed. A CN consists of two molecular sub-functionality (a chromophore and a stable nitroxide radical) tethered together by spacers. In the dual compound the nitroxide is a strong intramolecular quencher of the fluorescence from the chromophore fragment. Reduction to hydroxylamine, oxidation of the nitroxide fragment or addition of an active radical yield the fluorescence increase and the parallel decay of the fragment electron spin resonance (ESR) signal. At certain conditions the dual molecules undergo photomagnetic switching and form excited state multi-spin systems. These unique properties of CN were intensively exploited as the basis for several methodologies, which include molecular probing, modeling intramolecular photochemical and photophysical processes, and construction of new magnetic materials. [source]


The PTEN gene in locally progressive prostate cancer is preferentially inactivated by bi-allelic gene deletion

THE JOURNAL OF PATHOLOGY, Issue 5 2006
PCMS Verhagen
Abstract PTEN is frequently inactivated during the development of many cancers, including prostate cancer, and both bi-allelic and mono-allelic PTEN inactivation may contribute to tumorigenesis. PTEN mutations in clinical cancer specimens can easily be recorded but mono- or bi-allelic gene deletions are often difficult to assess. We performed a comprehensive study to detect PTEN inactivation in 40 locally progressive clinical prostate cancer specimens obtained by transurethral resection of the prostate, utilizing a variety of complementary technical approaches. The methods to detect PTEN deletion included allelotype analysis, dual-colour FISH and array-based CGH. We also applied a novel semi-quantitative approach, assessing the PTEN-WT (wild-type): PTEN- , (pseudogene) ratio (WPR). Structural analysis of PTEN was performed by single-strand conformational polymorphism (PCR-SSCP) and sequencing. PTEN protein expression was assessed by immunohistochemistry. Our data predict complete PTEN inactivation in 12 samples (30%), nine of these by bi-allelic deletion. Loss of one PTEN copy was also detected by several methodologies but the number could not be accurately assessed. Immunohistochemistry indicated the absence of PTEN protein in 15 samples, and heterogeneous expression of the protein in eight tumours. Taken together, these data show that bi-allelic deletion is a major mechanism of PTEN inactivation in locally progressive prostate cancer. Copyright © 2006 Pathological Society of Great Britain and Ireland. Published by John Wiley & Sons, Ltd. [source]