Data are supplied to NOAA Fisheries Service by dealers via Dealer Electronic Reporting to the Standard Atlantic Fisheries Information System (SAFIS) and/or by state agencies and may be preliminary. Discrepancies with data from previous Weekly Landings Reports are due to corrections made to the database. National Oceanic and Atmospheric Administration Cumulative Landings (Pounds) __________________________________________________________________________________ 30,000,000 25,000,000 20,000,000 15,000,000 10,000,000 5,000,000 0 5/1/2012 7/1/2012 9/1/2012 11/1/2012 1/1/2013 Date 85% Quota Quota Prior Year's Landings (whole wt. in pounds) Quota Rationing Trajectory Current Year's Landings (whole wt. in pounds) 3/1/2013
The term transition metal, according to the International Union of Pure and Applied Chemistry (IUPAC), refers to an element whose atom has an incomplete d sub-shell or which can give rise to cations with an incomplete d T.D. Bullen (*) U.S. Geological Survey, MS 420, 345 Middlefield Road, Menlo Park, CA 94025, USA sub-shell. As shown in Fig. 10.1, according to this definition transition metals occur in Groups 1B and 3B-8B of the periodic table, and the transition metals across the periodic table have progressively increasing d-shell electron occupancy up to a maximum of 9. A characteristic of transition metals is that they generally exhibit two or more oxidation states, which as a consequence often leads to differences in the stable isotope composition of the chemical compounds and aqueous species they form.