Iron localization in Acarospora colonizing schist on Signy Island

first_imgA small, inconspicuous lichen, Acarospora cf. badiofusca, was discovered colonizing ironstainedquartz mica schists on the lower slope of Manhaul Rock, a recently exposed nunatak on the McLeodGlacier, Signy Island, South Orkney Islands. Thallus colour ranged from rust on exposed rock surfaces topaler orange and green in shaded crevices. This study addressed the hypothesis that colour reflects elementlocalization, and considered substance localization within lichen tissues and responses to stress. Electronmicroprobe analysis of specimens confirmed that Fe is localized principally in the outer rust-coloured partof the cortex, confirming that the colour reflects Fe localization. Oxalates, widely reported as contributingto tolerance mechanisms to environmental stress, were not detected using X-ray diffraction. The upperthallus surface consisted of sub-micron particulate phases containing Fe, Al and O, suggesting mixed oxide/hydroxide phases are present and play a role in photoprotection.last_img read more

Theodore Roosevelt CSG Joins US 5th Fleet AOO

first_imgBack to overview,Home naval-today Theodore Roosevelt CSG Joins US 5th Fleet AOO April 8, 2015 View post tag: middle east Theodore Roosevelt CSG Joins US 5th Fleet AOO View post tag: Navy View post tag: CSG Authorities Share this article View post tag: Naval View post tag: News by topic View post tag: US 5th Fleet View post tag: Theodore Roosevelt The Theodore Roosevelt Carrier Strike Group (TRCSG) arrived in the U.S. 5th Fleet area of operations (AOO) following a routine transit of the Suez Canal, April 6.While in the U.S. 5th Fleet AOO, TRCSG will provide a range of flexible and adaptable capabilities in order to conduct theater security cooperation efforts, maritime security operations and provide crisis response.Commanded by Rear Adm. Andrew Lewis, TRCSG is composed of the flagship aircraft carrier USS Theodore Roosevelt (CVN 71), Carrier Strike Group 12, Carrier Air Wing 1, Destroyer Squadron 2 staff, the guided-missile cruiser USS Normandy (CG 60) and the guided-missile destroyers USS Winston S. Churchill (DDG 81), USS Farragut (DDG 90) and USS Forrest Sherman (DDG 98).The strike group will conduct a wide range of operations alongside regional and coalition partners aimed at building trust and cooperation while helping set conditions for regional stability.U.S. Naval Forces Central Command (NAVCENT) is responsible for approximately 2.5 million square miles of area including the Arabian Gulf, Gulf of Oman, North Arabian Sea, Gulf of Aden and the Red Sea.[mappress mapid=”15606″]Image: US Navylast_img read more