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New in GCA (v.140, 1 September 2014)
Heterogeneous mineral assemblages in martian meteorite Tissint as a result of a recent small impact event on Mars
Apparent energy of hydrated biomineral surface and apparent solubility constant: An investigation of hydrozincite
Calcium and titanium isotopic fractionations during evaporation
The effects of growth phase and salinity on the hydrogen isotopic composition of alkenones produced by coastal haptophyte algae
40Ar/39Ar impact ages and time–temperature argon diffusion history of the Bunburra Rockhole anomalous basaltic achondrite
Surface acidity of 2:1-type dioctahedral clay minerals from first principles molecular dynamics simulations
Biogeochemistry of dissolved organic matter in an anoxic intertidal creek bank
Pyroxenite and peridotite xenoliths from Hexigten, Inner Mongolia: Insights into the Paleo-Asian Ocean subduction-related melt/fluid–peridotite interaction
Reconstruction of intermediate water circulation in the tropical North Atlantic during the past 22,000 years
Fractionation of the geochemical twins Zr–Hf and Nb–Ta during scavenging from seawater by hydrogenetic ferromanganese crusts
The quest for regolithic howardites. Part 2: Surface origins highlighted by noble gases
First-principles calculations of equilibrium silicon isotope fractionation among mantle minerals
New in G-Cubed (v.15, issue 6)
Combined147,146Sm-143,142Nd constraints on the longevity and residence time of early terrestrial crust
Louisville Seamount Chain: Petrogenetic processes and geochemical evolution of the mantle source
Rhizon sampler alteration of deep ocean sediment interstitial water samples, as indicated by chloride concentration and oxygen and hydrogen isotopes
Isotope and trace element insights into heterogeneity of subridge mantle
800 meters beneath Antarctic ice sheet, subglacial lake holds viable microbial ecosystems
National Science Foundation
In a finding that has implications for life in other extreme environments, both on Earth and elsewhere in the solar system, researchers funded by the National Science Foundation published a paper confirming that the waters and sediments of a lake that lies 2,600 feet beneath the surface of the West Antarctic ice sheet support "viable microbial ecosystems."
Sunlight, not microbes, key to carbon dioxide in Arctic
Oregon State University via ScienceDaily
The vast reservoir of carbon stored in Arctic permafrost is gradually being converted to carbon dioxide after entering the freshwater system in a process thought to be controlled largely by microbial activity. However, researchers say that sunlight and not bacteria is the key to triggering the production of CO2 from material released by Arctic soils.
Hot-spring bacteria reveal ability to use far-red light for photosynthesis
Bacteria growing in far-red light use a previously unknown process for harvesting energy and producing oxygen from sunlight, a research team led by a Penn State scientist has discovered. The discovery lays the foundation for further research aimed at improving plant growth, harvesting energy from the Sun, and understanding dense blooms like those now occurring on Lake Erie and other lakes worldwide.
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