The surface properties of mixed monomolecular films of retinal and phospholipids (p. lipids) are measured as a function of mole fraction at a nitrogen-water interface. An acid pH of 6.0 is maintained in the aqueous phase. Before irradiation the surface potential deltaV for 9-cis retinal, 11-cis retinal, phosphatidyl serine (PS) and phosphatidyl ethanolamine (PE), at pi=12 dyn/cm, are 490 mV, 64...

Abstract Abstract: The interaction between Membrane Palmitoylated Protein -1 (MPP1) with lipid biand mono-layers composed of a DOPC/SM/Chol mixture was investigated. MPP1 co-migrates with liposomes to the top of the liposome flotation gradient, indicating binding of MPP1 with liposomes. The injection of MPP1 into the subphase of an LB monolayer of the above lipid composition induced an increase...

In this work, a systematic molecular simulation study was performed to compare the separation of CO2/N2 and CH4/N2 mixtures in two different classes of nanoporous materials, zeolites, and metal-organic frameworks (MOFs). For this purpose, three zeolites (MFI, LTA, and DDR) and seven MOFs (Cu-BTC, MIL-47 (V), IRMOF-1, IRMOF-12, IRMOF-14, IRMOF-11, and IRMOF-13) were chosen as the representatives...

The purpose of this study was to collect experimental data and develop a mathematical model describing the equilibrium phase distribution of a common organic chemical, trichloroethylene (TCE), among cyclodextrin (CD), water, and granular-activated carbon (GAC). Batch tests and a modified linear regression model were applied to assess the partitioning behavior in this multiphase (CD pseudophase–...

Sorption of 75 active pharmaceutical ingredients (APIs) to three different types of sludge (primary sludge, secondary sludge with short and long sludge age respectively) were investigated. To obtain the sorption isotherms batch studies with the APIs mixture were performed in four nominal concentrations to water containing 1 g of sludge. The range of APIs concentrations was between ng L(-1) to μ...

1 For virtually any physical adsorption process, the capacity of an adsorbent decreases as the temperature of the system increases. As the temperature increases the adsorbed molecules acquire sufficient energy to overcome the van der Waals’ attraction, holding them in the condensed-phase and migrating back to the gas-phase. Adsorption is an exothermic process. At low concentrations the heat rel...

Competitive hybridization, at the surface and in the bulk, lowers the sensitivity of DNA chips. Competitive surface hybridization occurs when different targets can hybridize with the same probe. Competitive bulk hybridization takes place when the targets can hybridize with free complementary chains in the solution. The effects of competitive hybridization on the thermodynamically attainable per...

Measurements of the surface tensions, densities and viscosities of aqueous solutions of Triton X-100 (TX-100) and rhamnolipid (RL) mixtures, at constant concentration of RL or TX-100, were carried out. The measured values of the surface tension were compared to those determined using different theoretical models and on the basis of the surface tension of aqueous solutions of individual surfacta...

In recent years, with the development of 3D data acquisition equipments, the study on reverse engineering becomes more and more important. However, the existing methods for parameterization are hard to ensure that the parametric domain is rectangular, and the parametric curve grid is regular. In order to overcome the limitations, we present a novel method for parameterization of triangular mesh...

Facile evaluation of mixed-salt effect on the strongly salt-dependent thermodynamic and kinetic parameters of protein-DNA complexes is of importance for relevant biochemical and biophysical studies. In pursuit of this aim, binding isotherms for open transcription complex (RPo) of Escherichia coli RNA polymerase (R) at lambdaP(R) promoter DNA (P) were determined as a function of salt concentrati...