UV absorbance spectroscopy is the most common method for detecting nucleic acid structural transitions and obtaining thermodynamic parameters. UV-detected melting has been used to determine stabilities of nucleic acid hairpins, duplexes, triplexes, and higher order structures and to determine thermodynamic effects of unusual or modified bases and mismatched base-pairs. We report that in some ca...

stable homogeneous dispersions of carbon nanotubes (cnts) were prepared using ethanol as dispersing agent. then, using sol-gel method, dispersion in the hydroxyapatite matrix and its effects on the microstructure were investigated. the phase composition, chemical structure and morphological and size analyses were performed using xrd, ft-ir, sem, tem/saed/edx and raman spectroscopy. the influenc...

abstract: camel milk contains sufficient levels of insulin and does not form the coagulum in the stomach preventing degradation of insulin and act as an effective vehicle to take the milk insulin unchanged to the intestine. in present study direct spectroscopy and standard addition method, well-known methods in analytical chemistry were used for determining insulin concentration in camel milk. ...

modified bubble column extraction with ultrasonic bath (bce-ub) method was used to extract atropine from the stem and leaves of atropa belladonna. optimum condition were obtained with kamada solvent which was chloroform-methanol-ammonia 15:15:1(v/v/v) as extraction solvent, the particle size of  less than  350 µm, an extraction time of 23.95 min, a liquor to material ratio of 15.08 ml/g and  an...

green synthesis of nanoparticles, as fundamental building blocks of nanotechnology, has recently attracted considerable attention. silver nanoparticles have unique physiochemical, biological and environmental properties which make them useful in a wide range of applications. in the present paper we report our research results on biosynthesis of silver nanoparticles from silver precursor using m...

zno and zno: mn nanocrystals synthesized via reverse micelle method. the structural properties nanocrystals were investigated by xrd and transmission electron microscopy (tem). the xrd results indicate that the synthesized nanocrystals had a pure wurtzite (hexagonal phase) structure. the various optical properties of these nanocrystals such as optical band gap energy, refractive index, dielectr...

nanotechnology has been advanced since the last decades. among all nanomaterials that have been developed, nanosilver is the most frequently used nanoparticles. its release into natural water bodies is inevitable due to its broad applications. nanosilver (nag) was prepared via tollens method using. the morphology, size distribution and average size of the obtained nag was characterized using tr...

the adsorption characteristics of riboflavin onto silver-deposited iron oxide magnetic nanoparticles (ag/fe3o4) have been described. characterization of the synthesized ag/fe3o4 nanoparticles was achieved by ftir spectra, tem image and xrd pattern. the influence of several experimental parameters such as nanoparticles dosage, ph of the sample solution, different orientations of the riboflavin m...

hsa plays an important role in transporting metabolites and drugs throughout the vascular system.  in as much as its performance is very vital in the presents of different kinds of ligands at the specific body temperatures, its examination is crucial. this molecule can undergo increased glycation in diabetes. therefore, glucose as the one of the most fundamental ligands dealing with albumin in ...