10 research outputs found
2010 Status of the Lake Ontario Lower Trophic Levels
This report presents data on the status of lower trophic level components of the Lake Ontario ecosystem (zooplankton, phytoplankton, nutrients) in 2010 and compares the 2010 data with available time series. Lower trophic levels are indicators of ecosystem health [as identified by the Lake Ontario Pelagic Community Health Indicator Committee (EPA 1993) and presented in the biennial State of the Lake Ecosystem Conference (SOLEC) reports] and determine the lake’s ability to support the prey fish upon which both wild and stocked salmonids depend. Understanding the production potential of lower trophic levels is also integral to ecosystem-based management. Continued evaluation of lower trophic levels is particularly important for fisheries management, as the observed declines in alewife and Chinook salmon in Lake Huron in 2003 may have been partly the result of changes in lower trophic levels (Barbiero et al. 2009)
Theoretical Study of Near Edge X-Ray Absorption Fine Structure Spectra of Metal Phthalocyanines at C And N K-Edges
The inner shell excitation of CuPc, NiPc, and
H2Pc phthalocyanines at both C and N K-edges has been
investigated theoretically by density functional theory calculations.
The selected molecules allow one to study the effect on the
spectra of the presence and the nature of the atom in the central
cavity of the macrocycle. The individual characteristics of the
spectra can be rationalized in terms of the position of the
unequivalent C and N atomic sites, showing that sensible changes
are present in the spectral features deriving from the N atoms
directly bound to the atom at the center of the Pc macrocycle. The minor variations present in the spectral C 1s profiles of the
phthalocyanines reflect the little perturbation experienced by the peripheral atomic sites