title: Deuterium-free water (1H2O) in complex life-support systems of long-term space missions.
abstract: Heavy water containing deuterium displays toxic property. It is stated that any quantity of a heavy isotope of hydrogen--deuterium--is undesirable to animals and plants. It was earlier shown by us that physical-chemical life support systems on board the "MIR" station fractionate (change) isotopes of hydrogen, oxygen and carbon. Therefore, the problem of regenerative systems in habitable space objects should include removal, from water, of a heavy stable isotope of hydrogen--deuterium. In this article we consider one method of obtaining deuterium-free water--decomposition of distillate water in an electrolyser to hydrogen and oxygen with subsequent synthesis in a catalytic or high-temperature reactor. The influence of deuterium-free water on the growth and development of Arabidopsis thaliana and Japanese quail is investigated. It is shown that with the help of the electrolysis method it is possible to fabricate water containing 80% less deuterium in comparison with SMOW. Experimentally, it is proved on a culture of Arabidopsis thaliana and Japanese quail that water with reduced contents of deuterium (80%) displays positive biological activity.
authors.affiliation: Russian Academy of Science, State Scientific Centre of Russian Federation, Institute of Biomedical Problems, Moscow, Russia.
authors.forename: Y
authors.initials: Y
authors.lastname: Sinyak
authors.forename: A
authors.initials: A
authors.lastname: Grigoriev
authors.forename: V
authors.initials: V
authors.lastname: Gaydadimov
authors.forename: T
authors.initials: T
authors.lastname: Gurieva
authors.forename: M
authors.initials: M
authors.lastname: Levinskih
authors.forename: B
authors.initials: B
authors.lastname: Pokrovskii
mesh_terms: D000818:Animals; D017360:Arabidopsis / Q000187:drug effects / Q000254:growth & development*; D003370:Coturnix / Q000254:growth & development* / Q000502:physiology; D017666:Deuterium Oxide / Q000737:chemistry / Q000494:pharmacology*; D004305:Dose-Response Relationship, Drug; D018504:Ecological Systems, Closed; D004572:Electrolysis; D018525:Germination / Q000187:drug effects; D008021:Life Support Systems / Q000295:instrumentation*; D012639:Seeds / Q000187:drug effects / Q000254:growth & development; D013026:Space Flight / Q000295:instrumentation*; D014867:Water / Q000737:chemistry; D018508:Water Purification / Q000379:methods*; D014881:Water Supply; D014893:Weightlessness
chemical_list: D014867:Water; D017666:Deuterium Oxide