The Bactericidal Effect of MA-T for Factitiously Contaminated and Used Masks.

Matching transformation system (MA-T), an on-demand aqueous chlorine dioxide solution, is an excellent safety disinfectant, because chlorine dioxide is not detected during storage or before use. The production of chlorine dioxide in MA-T is induced by a catalytic reaction in the presence of target microorganisms. In this study, we investigated MA-T disinfection of masks as a reuse method to eliminate mask shortages.

Secondary ion yields for vacuum-type electrospray droplet beams measured with a triple focus time-of-flight analyzer.

Rationale: We previously developed a massive cluster ion beam gun for secondary ion mass spectrometry (SIMS) in which the primary beam source is a vacuum electrospray. The secondary ion yields produced by this method had not yet been measured with a commercial time-of-flight (TOF) secondary ion mass spectrometer, and the ionization performance was unknown.

Methods: A vacuum-type electrospray droplet ion gun was connected to a triple-focus TOF analyzer.

[Gastrointestinal transit in the chicken using 198Au-colloid as a marker (author's transl)].

Gastrointestinal transit in the chicken was investigated by using 198Au-colloid as a marker. Gastrointestinal transit was determined following administration of a 198Au-colloid solution (370 kBq (10 microCi), 0.5 ml) into the proventriculus by measuring the distribution of radioactivity in the gastrointestine.

[Distribution, absorption and excretion of 198Au-colloid and Na251CrO4 in the chicken (author's transl)].

In order to clarify the suitability of 198Au-colloid and Na251CrO4 as a marker of transit of the gastrointestinal content of the chicken, the distribution, absorption and excretion of 198Au-colloid and Na251CrO4 in the chicken were examined. Orally administered 198Au-colloid was not absorbed by the gastrointestinal tract and excreted into feces. Intravenously injected 198Au-colloid was not excreted into the gastrointestinal tract through the gastrointestinal wall.