Selenium Sulfide Ring Molecules.

Hydrogen sulfide and polysulfides as signaling molecules

Hydrogen sulfide (H2S) is a familiar toxic gas that smells of rotten eggs. After the identification of endogenous H2S in the mammalian brain two decades ago, studies of this molecule uncovered physiological roles in processes such as neuromodulation, vascular tone regulation, cytoprotection against oxidative stress, angiogenesis, anti-inflammation, and oxygen sensing. Enzymes that produce H2S, ...

Real-time probing of radical events with sulfide molecules

The physio-pathological roles of sulfide biomolecules in cellular environments involves redox processes and radical reactions that alter or protect the functional properties of enzymatic systems, proteins and nucleic acids repair. We focus on micromolar monitoring of sulfur-centered radical anions produced by direct electron attachment, using sulfide molecules (a thioether and a disulfide biomo...

Equilibrium Size of Large Ring Molecules

The equilibrium properties of isolated ring molecules were investigated using an off-lattice model with no excluded volume but with dynamics that preserve the topological class. Using an efficient set of long range moves, chains of more than 2000 monomers were studied. Despite the lack of any excluded volume interaction, the radius of gyration scaled like that of a self avoiding walk, as had be...

Liquorice 7% versus selenium sulfide 1% shampoos in the treatment of dandruff: a clinical trial

Entropies and Heat Capacities of Gaseous Selenium Molecules

The presumably cyclic molecules Ses, Se6 and Se; are the main constituents of saturated selenium vapor at temperatures up to 400 °C as well as of the vapor above freely subliming trigonal selenium, and cyclic Seg molecules can be prepared as various crystalline modifications [1], Small selenium rings are also discussed as constituents of liquid and amorphous selenium obtained by quenching the l...