ABSTRACT
The boundary between ice and basalt on Earth is an analogue for some near-surface environments of Mars. We investigated neutrophilic iron-oxidizing microorganisms from the basalt-ice interface in a lava tube from the Oregon Cascades with perennial ice. One of the isolates (Pseudomonas sp. HerB) can use ferrous iron Fe(II) from the igneous mineral olivine as an electron donor and O(2) as an electron acceptor. The optimum growth temperature is â¼12-14°C, but growth also occurs at 5°C. Bicarbonate is a facultative source of carbon. Growth of Pseudomonas sp. HerB as a chemolithotrophic iron oxidizer with olivine as the source of energy is favored in low O(2) conditions (e.g., 1.6% O(2)). Most likely, microbial oxidation of olivine near pH 7 requires low O(2) to offset the abiotic oxidation of iron. The metabolic capabilities of this bacterium would allow it to live in near-surface, icy, volcanic environments of Mars in the present or recent geological past and make this type of physiology a prime candidate in the search for life on Mars.
Subject(s)
Caves/microbiology , Extraterrestrial Environment , Geologic Sediments/microbiology , Ice , Iron Compounds/metabolism , Magnesium Compounds/metabolism , Mars , Pseudomonas/isolation & purification , Silicates/metabolism , Volcanic Eruptions , Aerobiosis , Exobiology , Heterotrophic Processes , Hydrogen-Ion Concentration , Particle Size , Phylogeny , Pseudomonas/genetics , Pseudomonas/growth & development , Pseudomonas/metabolismABSTRACT
In 2007, the low level of young adults with developmental disabilities who were employed in the 3 months postgraduation from high school led the Washington State legislature to authorize and fund the Jobs by 21 Partnership Project. The intent of the project was to identify and demonstrate best practices in sustainable partnerships among Washington State's school and adult service systems. Results indicated that participants in the project were more likely to be employed following school exit and had stronger employment outcomes than students who did not participate. Further, data suggest that improved employment outcomes were supported by the leveraging and maximization of financial and in-kind resources and the strengthening of collaborative relationships across project stakeholders.
