The hydrated ternary lamellar lipid mixture of dipalmitoyl-PC/dilauroyl-PC/cholesterol (DPPC/DLPC/Chol) has been studied by electron spin resonance (ESR) to reveal the dynamic structure on a molecular level of the different phases that exist and coexist over virtually the full range of composition. The spectra for more than 100 different compositions at room temperature were analyzed by nonline...

A new version of the ESR spin probe partitioning method is developed and applied to the study of hydration properties of dimyristoyl-phosphatidylglycerol (DMPG) and dimyristoyl-phosphatidylcholine (DMPC) vesicles as functions of salt concentration and temperature above the lipid phase transition. The small spin probe di-tert-butyl nitroxide (DTBN) is used in order to achieve motionally narrowed...

Titania supported vanadomolybdophosphoric acid (VMPA) catalysts with vanadium in different positions, incorporated into the molybdophosphoric acid structure by substituting for molybdenum and cation exchanged on the molybdophosphoric acid surface, were synthesized. The catalysts were characterized by XRD, FT-IR, Raman spectroscopy, TPR, XPS, and ESR techniques. The FT-IR and Raman spectral anal...

The effect of steroid substrate addition on the visible absorption and electron spin resonance (ESR) properties of cytochrome P450 was studied in bovine adrenal cortex submitochondrial particles. The interaction of ll-deoxycortisol or deoxycorticosterone produced peaks at 385, 500, and 645 nm and troughs at 420, 535, and 570 run. 2OarHydroxycholesterol produced opposite spectral effects. llDeox...

The application of two-dimensional Fourier-transform electron-spin-resonance (2D-FT-ESR) to the study of lipid/gramicidin A (GA) interactions is reported. It is shown that 2D-FT-ESR spectra provide substantially enhanced spectral resolution to changes in the dynamics and ordering of the bulk lipids (as compared with cw-ESR spectra), that result from addition of GA to membrane vesicles of dipalm...

The electron spin resonance (ESR) spectra of 15NOand 14NO-ligated Hb Kansas have been measured at 77 K in the range of pH 5 to 10. At low pH the ESR spectrum is the composite of a type I and a type II spectrum which changes to another composite of a type I and type II spec­ trum at high pH. For the definition of type I and type II spectra and the correlation of these types with two tertiary con...

Metal complexes of tioconazole such as [Cu(nor)2(H2O)2], [Zn(nor)2(H2O)2], [Ni(nor)2(H2O)2].4H2O and [Fe(nor)2(H2O)Cl].5H2O have been synthesized and characterised by elemental analysis, IR, UV-Visibe, ESR, NMR, XRD spectrscopic techniques. Thermal analysis was studied by TGA, DSC method. Morphological studies were carried out by scanning electron microscopic method. DNA binding studies were ca...

We have studied the origin of strong visible photoluminescence ~PL! in a Ge/porous Si ~PS! structure in terms of infrared spectroscopy and electron spin resonance ~ESR!. Spectral analyses indicate that the enhanced PL cannot arise from both the quantum confinement on Ge nanocrystals embedded in the pores and the chemical compound of Ge, O, and H at the surface of the porous Si formed during Ge ...

Some Copper(II)-Manganese(II) trinuclear complexes of Schiff bases derived from 2aminobenzaldehyde and diamines are reported and characterized based on their elemental analyses, conductivity studies, IR, UV-Visible, ESR spectroscopy and cyclic voltammetric studies. The complexes are found to have the formula [Mn(CuL)2](CH3COO)2. The elemental analyses data confirms the formation of trinuclear c...