Carbon Atom Reactivity with Amorphous Solid Water: HO-Catalyzed Formation of HCO.

We report new computational and experimental evidence of an efficient and astrochemically relevant formation route to formaldehyde (HCO). This simplest carbonylic compound is central to the formation of complex organics in cold interstellar clouds and is generally regarded to be formed by the hydrogenation of solid-state carbon monoxide. We demonstrate HCO formation the reaction of carbon atoms with amorphous solid water.

A cryogenic ice setup to simulate carbon atom reactions in interstellar ices.

The design, implementation, and performance of a customized carbon atom beam source for the purpose of investigating solid-state reaction routes in interstellar ices in molecular clouds are discussed. The source is integrated into an existing ultrahigh vacuum setup, SURFace REaction SImulation DEvice (SURFRESIDE), which extends this double atom (H/D, O, and N) beamline apparatus with a third atom (C) beamline to a unique system that is fully suited to explore complex organic molecule solid-state formation under representative interstellar cloud conditions. The parameter space for this system is discussed, which includes the flux of the carbon atoms hitting the ice sample, their temperature, and the potential impact of temperature on ice reactions.

Solid state chemistry of nitrogen oxides--part II: surface consumption of NO2.

Nitrogen oxides are considered to be important astrochemical precursors of complex species and prebiotics. However, apart from the hydrogenation of solid NO that leads to the surface formation of hydroxylamine, little is known about the full solid state reaction network involving both nitrogen and oxygen. Our study is divided into two papers, hereby called Part I and Part II.

Solid state chemistry of nitrogen oxides--part I: surface consumption of NO.

The role of nitrogen and oxygen chemistry in the interstellar medium is still rather poorly understood. Nitric oxide, NO, has been proposed as an important precursor in the formation of larger N- and O-bearing species, such as hydroxylamine, NH2OH, and nitrogen oxides, NO2 and N2O. The topic of this study is the solid state consumption of NO via oxygenation and the formation of NO2 and other nitrogen oxides (ONNO2 and N2O4) under conditions close to those encountered on icy grains in quiescent interstellar clouds.

[The treatment of patients with broncho-pulmonary pathology and concomitant disturbances of oxalic acid metabolism].

This work was aimed at estimating the role of special therapy of patients with bronchial asthma, COPD and hyperoxaluria designed to restrict the delivery or eliminate excess of oxalates and producing well apparent beneficial effect confirmed by the disappearance or decrease of clinical and functional manifestations of obstruction, reduction of requirements for broncholytic and anti-inflammatory agents.