Effect of ethanol on the main phase transition of distearoylphosphatidylcholine
نویسندگان
چکیده
A highly sensitive scanning microcalorimeter and a low scanning rate (0.1 K/min) has been used to determine the thermodynamic properties of the main phase transition of distearoylphosphatidylcholine (DSPC) in presence of ethanol in the 0–0.20 ethanol mole fraction (x2) range. These measurements revealed previously unreported features of DSPC/water/ethanol phase behavior and visualized distinct changes in the main phase transition mechanism induced by addition of ethanol. It is found that the well known interdigitated phase in DSPC induced by ethanol above x2=0.01 abruptly disappears at x2=0.12. The abrupt change in the DSPC phase behavior at x2=0.12 shows some analogies with the observed one relative to the conformation response of DNA molecule to solvent condition altered by varying amounts of ethanol. As inferred from previous adiabatic compressibility and IR data in water/ethanol mixtures, a correlation between changes in properties of the solvent, and the effect of ethanol on both the conformational properties of DNA and the main phase transition of DSPC clearly appears from the data. © 2002 Elsevier Science B.V. All rights reserved.
منابع مشابه
Interference of Various Sources of Sensory Feedback on Transition of Relative Phase in Bimanual Coordination on Active and Inactive Woman With Multiple Sclerosis
Purpose: Comparing the effects of manipulating senses on relative phase transition bimanual coordination pattern of active and inactive women with Multiple Sclerosis (MS). Methods: The methodology of this study was repeated-measures design. Study participants comprised 10 active women and 10 inactive women with multiple sclerosis who voluntarily participated in this experiment. The participant...
متن کاملIs the Freeze Drying Method Effect on the Phase Transition Temperature ofβ/β́́ Lithium Zirconium Phosphate?
Spherical granules of the superionic conductor β/β́ LiZr2(PO4)3 in the range of sub 100 nm sizewere synthesizedvia freeze drying methodand fully reviewed in all aspects. Samples were characterized by the X-ray diffractometry (XRD), the Thermal analysis (TG, DSC), theFourier Transform Infra-Red Spectroscopy (FTIR) and the Scanning Electron Microscopy (SEM).Their structuredepends largely on the me...
متن کاملAnnealing temperature effect on nanostructure and phase transition of Copper Oxide thin films
This paper addresses the annealing temperature effect on nanostructure and phase transition of copper oxide thin films, deposited by PVD method on glass substrate (at 110 nm thickness) and post annealed at different temperatures (200-400°C) with a flow of 1 cm3s-1 Oxygen. The X-ray diffraction (XRD) was employed for crystallographic and phase analyses, while atomic force m...
متن کاملEFFECT OF THE NEXT-NEAREST NEIGHBOR INTERACTION ON THE ORDER-DISORDER PHASE TRANSITION
In this work, one and two-dimensional lattices are studied theoretically by a statistical mechanical approach. The nearest and next-nearest neighbor interactions are both taken into account, and the approximate thermodynamic properties of the lattices are calculated. The results of our calculations show that: (1) even though the next-nearest neighbor interaction may have an insignificant ef...
متن کاملAnnealing temperature effect on nanostructure and phase transition of Copper Oxide thin films
This paper addresses the annealing temperature effect on nanostructure and phase transition of copper oxide thin films, deposited by PVD method on glass substrate (at 110 nm thickness) and post annealed at different temperatures (200-400°C) with a flow of 1 cm3s-1 Oxygen. The X-ray diffraction (XRD) was employed for crystallographic and phase analyses, while atomic force m...
متن کامل