Sensitive differential scanning calorimetry was employed to investigate thylakoid membrane structure. Calorimetric scans of chloroplast membranes suspended in a low ionic strength Hepesbuffered medium revealed endothermic transitions centered at the following temperatures ( degrees C): A (42.5), B (60.6), C(1) (64.9), C(2) (69.6), D (75.8), E (84.3), and F (88.9). The B transition was demonstra...

We present a computational survey of the reduction CO2 to CO by alkali metal and alkaline earth chloride anions in gas phase, uncovering also mechanistic aspects on selective tuning between oxalate carbonate products relevant chemical or electrochemical processes. The single molecule is typically endothermic, whereas corresponding disproportionation reaction involving two molecules exothermic. ...

magnesium hydroxide nanostructures as an effective flame retardant were synthesized by a facile and rapid microwave reaction. the effect of different surfactants such as cationic, anionic and polymeric on the morphology of magnesium hydroxide nanostructures was investigated. nanostructures were characterized by x-ray diffraction (xrd), scanning electron microscopy (sem) and fourier transform in...

Reactions of Fe+ with DzO and FeO+ with Dz are studied as a function of translational energy in a guided-ion beam tandem mass spectrometer. In the former system, the only products observed from single-collision events are FeD+ and FeOD+. These products are formed in endothermic reactions. At low energies, the FeODZ+ adduct is also observed, a result of secondary stabilizing collisions with D2O....

Using density functional theory we examine the crystal structure and the finite-temperature thermodynamics of formation and dehydrogenation for the quaternary hydride Li4BN3H10. Two recent studies based on x-ray and neutron diffraction have reported three bcc crystal structures for this phase. While these structures possess identical space groups and similar lattice constants, internal coordina...

Steam reforming reaction heat effects were implemented in CFD simulations of different packed tube models of 1-hole and 4-hole cylinders. A computationally less expensive 120◦ wall segment approach was utilized for the simulations in this study. Heat effects of the reactions were introduced by heat generation/consumption terms in the catalyst particles considering suitable reaction kinetics pro...

al(oh)3 nanoparticles were synthesized by a simple precipitation reaction. the effect of various amines like ethylene diamine, propylene diamine, triethylenetetramine and tetraethylenepentamine as precipitating agents on the morphology of al(oh)3 nanostructures was investigated. the influence of al(oh)3 nanoparticles on the flame retardancy of the poly vinyl alcohol (pva) matrix was studied usi...

the work focuses on the removing of cu(ii) from aqueous solution by linde f(k) zeolite. the zeolite is synthesized from fly ash by hydrothermal process. the adsorption experiments discuss several factors including the optimal solution ph, zeolite dosage, adsorption temperature, adsorption kinetics and adsorption isotherm equation. the results show that, the optimal solution ph is 6 and the effi...

This study explores the endothermic dehydriding (desorption) reaction that takes place in a high-pressure metal hydride (HPMH) hydrogen storage system when hydrogen gas is released to the fuel cell. The reaction is sustained by circulating warm fluid through a heat exchanger embedded in the HPMH powder. A systematic approach to modeling the dehydriding process is presented, which is validated a...

Most of the cellular ATP in living organisms is synthesized by the enzyme F(1)F(o)-ATP synthase. The water soluble F(1) part of the enzyme can also work in reverse and utilize the chemical energy released during ATP hydrolysis to generate mechanical motion. Despite the availability of a large amount of biochemical data and several x-ray crystallographic structures of F(1), there still remains a...