In the present work, two asymmetric polymer membranes based on polyvinylidene fluoride (PVDF) and polyvinylpyrrolidone (PVP) with chitin and chitosan (as extractive agents) were synthesized through the phase inversion technique. The mechanisms of oriented process for the facilitated extraction of blue P3R dye across the as-prepared membranes were elucidated through different experiments. Furthe...

This paper presents a new model to calculate the characteristic impedance and wave propagation constant of a microstrip line made of a superconducting material. Modelling provides the only tool for designing superconducting microstrip based circuits because no direct measurements of such a line can be made at millimetre and sub-millimetre waves and at cryogenic temperature of 4 K with required ...

A combination of laser light scattering (LLS), viscometry, and fluorescence spectroscopy was used to study the association of a series of fluorocarbon-modified poly(N-isopropylacrylamide) (PNIPAM) copolymers in aqueous solution. The interchain association increases as both the fluorocarbon content and polymer concentration increase, evidenced by the changes of the apparent molar mass, intrinsic...

Magnesium is an abundant element in the environment. Magnesium ion sensing by fluorescence spectral method is of importance due to the need for the detection of the metal in the human body and the environment. In this paper, we report the Mg2+ ion sensing behavior of the phenylhydrazone derivative of a difluorenylpiperidin-4-one. The preparation method of this compound is simple. The compound s...

     Most of the biological phenomena are influenced by intermolecular recognition and interaction. Thus, understanding the thermodynamics of biomacromolecule ligand interaction is a very interesting area in biochemistry and biotechnology. One of the most powerful techniques to obtain precise information about the energetics of (bio) molecules binding to other biological macromolecules is isoth...

The interaction between tRNA and rabbit liver 80S ribosomes and 40S subunits was studied using a nitrocellulose membrane filtration technique. Binding of the different tRNA forms (aminoacyl-, peptidyl- or deacylated) to poly(U)-programmed 40S subunits and 80S ribosomes was found to be a cooperative process. The association constants of AcPhe-TRNA(Phe) for the A and P sites of 80S ribosomes and ...

Yolk proteins purified from the nematode Caenorhabditis elegans, from the frog Xenopus laevis, and from chicken eggs all have the unexpected property of binding strongly and preferentially to a left-handed Z-DNA probe, brominated poly(dG-dC). We estimate that the nematode proteins bind to Z-DNA with an association constant of at least 10(4) (M-1) and that this association constant is at least 4...