By J. Steele, et. al.
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Additional resources for Marine Chemistry and Geochemistry [Deriv. of Encyc. of Ocean Scis.]
Uptake systems for zinc, cadmium, cobalt(II), and copper(II) are somewhat more complex. The phytoplankton species examined to date have at least two separate zinc transport systems: a low-affinity system whose Vmax is relatively constant, and an inducible high-affinity system. The low-affinity system has high Vmax and high Ks values and transports zinc at high zinc ion concentrations. The high-affinity system is responsible for zinc uptake at low zinc ion concentrations, and has low Ks, and variable Vmax values that are under negative feedback regulation.
Comparison of the PGE content of meteoritic material, believed to represent the primordial material that constituted the undifferentiated earth, to ultramafic rocks, believed to be representative of the deep silicate earth, reveals a nearly uniform 100-fold depletion of the PGEs in the deep silicate earth. This depletion indicates that roughly 99% of the whole earth PGE inventory is sequestered within the earth’s metallic core. Further comparison of the PGE concentrations of ultramafic rocks to estimated PGE concentrations of upper crustal rocks shows an additional more variable depletion of the PGEs in rocks exposed at the earth’s surface relative to the deep silicate earth.
Marine Chemistry 57: 137--161. Kustka AB, San˜udo-Wilhelmy S, Carpenter EJ, et al. (2003) Iron requirements for dinitrogen and ammonium supported growth in cultures of Trichodesmium (IMS 101): Comparison with nitrogen fixation rates and iron:carbon ratios of field populations. Limnology and Oceanography 48: 1869--1884. Maldonado MT and Price NM (1996) Influence of N substrate on Fe requirements of marine centric diatoms. Marine Ecology Progress Series 141: 161--172. Martin JH, Gordon RM, Fitzwater S, and Broenkow WW (1989) VERTEX: Phytoplankton/iron studies in the Gulf of Alaska.