Photometric Extraction of the Pulse and Orbital Periods of ASAS182612: Eclipsing Binary with a Type II Cepheid Component

In 2007, Antipin, Sokolovsky, and Ignatieva discovered the first eclipsing binary with a Type II Cepheid component in our Galaxy, ASAS182612. We present the analysis of ASAS182612’s pulse and orbital periods from 2007 to 2014 using B, V, R, and I filters. The pulsation and orbital periods were found to be 4.1622 ± .0003 days and 51.366 ± .025 days, respectively. The angular acceleration of the pulse period was determined to be 1.1E-6 ± 1E-7 rad/day2

EC1271 Developing Attractive Farmsteads in Nebraska

Extension circular 1271 is about developing attractive farmsteads in Nebraska

EC1271 Developing Attractive Farmsteads in Nebraska

Extension circular 1271 is about developing attractive farmsteads in Nebraska

EC1262 Flowers for Every Yard

Extension circular 1262 is about what kind of flowers are good for a gardens

EC1231 Managing the Home Orchard

Extension circular 1231 is about managing the home orchard

Nitrate-Dependent Iron Oxidation: A Potential Mars Metabolism

This work considers the hypothetical viability of microbial nitrate-dependent Fe2+ oxidation (NDFO) for supporting simple life in the context of the early Mars environment. This draws on knowledge built up over several decades of remote and in situ observation, as well as recent discoveries that have shaped current understanding of early Mars. Our current understanding is that certain early martian environments fulfill several of the key requirements for microbes with NDFO metabolism. First, abundant Fe2+ has been identified on Mars and provides evidence of an accessible electron donor; evidence of anoxia suggests that abiotic Fe2+ oxidation by molecular oxygen would not have interfered and competed with microbial iron metabolism in these environments. Second, nitrate, which can be used by some iron oxidizing microorganisms as an electron acceptor, has also been confirmed in modern aeolian and ancient sediment deposits on Mars. In addition to redox substrates, reservoirs of both organic and inorganic carbon are available for biosynthesis, and geochemical evidence suggests that lacustrine systems during the hydrologically active Noachian period (4.1–3.7 Ga) match the circumneutral pH requirements of nitrate-dependent iron-oxidizing microorganisms. As well as potentially acting as a primary producer in early martian lakes and fluvial systems, the light-independent nature of NDFO suggests that such microbes could have persisted in sub-surface aquifers long after the desiccation of the surface, provided that adequate carbon and nitrates sources were prevalent. Traces of NDFO microorganisms may be preserved in the rock record by biomineralization and cellular encrustation in zones of high Fe2+ concentrations. These processes could produce morphological biosignatures, preserve distinctive Fe-isotope variation patterns, and enhance preservation of biological organic compounds. Such biosignatures could be detectable by future missions to Mars with appropriate instrumentation

EC1262 Flowers for Every Yard

Extension circular 1262 is about what kind of flowers are good for a gardens

EC1231 Managing the Home Orchard

Extension circular 1231 is about managing the home orchard