Iron limitation

Iron—Limit to 3 ppm. Note that excessive concentrations of iron may stain cooling tower components, but these stains are not the result of any rust or corrosion. 

Frost, R. W. and Franzen, N. C. (1992). Grazing and iron limitation in the control of phytoplankton stock and nutrient concentration A chemostat analogue... 

Loukos, H., Frost, B., Harrison, D. E. and Murray, J. W. (1997). An ecosystem model with iron limitation of primary production in the equatorial Pacific at 140 =W. Deep-Sea Res. II44,2221-2249. 

Miller, C. B., Erost, B. W., Wheeler, P. A. et al. (1991). Ecological dynamics in the subarctic Pacific, a possible iron-limited ecosystem. Limnol. Oceanogr. 36, 1600-1615. 

Transcriptionnal activity of pel genes responds differentially to catabolic repression, growth phase, temperature and nitrogen starvation. Iron limitation proved to be involved in the induction of severd of the pectinase encoding genes [7]. 

Iff the light of the above data, we examined the incidence of the cbrA21 (chrysobactin siderophore produced constitutively) and kdgR mutations on the transcriptional activity of pel genes. We chose to study pelD uidA and pelE uidA that proved to be well expressed in planta and whose suceptibility to iron limitation is different ... 

This review will not be concerned with functionally alternative structures and metabolites which appear in iron-limited growth. Thus Clostridium pasteurianum and other bacteria when grown in the presence of iron form ferredoxin grown at low iron the same organisms form flavodoxin, a flavoprotein [Knight, ., Jr., Hardy, R. W. J. Biol. Chem. 242, 1370 (1967) Mayhem, S. G., Massey, V. J. Biol. Chem. 244, 794 (1969)]. 

Even if, as discussed above, DFO can enhance the growth of selected microorganisms that have the capacity to extract the iron from FO, the drug may, by withdrawing iron, limit the growth of many other microorganisms (Boelaert et ah, 1993b). Whether this may have clinical application in the prevention or cure of some infectious diseases will be discussed later in this chapter. 

Wilhelm, S. W. and Trick, C. G. (1994). Iron-limited growth of cyanobacteria -multiple siderophore production is a common response, Limnol. Oceanogr., 39, 1979-1984. 

Extracellular chelators are not only known for decreasing uptake fluxes. Under iron-limiting conditions, many organisms are known to release side-rophores that strongly complex and solubilise iron (see Chapter 6 of this... 

Wasserfallen A, Huber K, LeisingerT. 1995. Purification and structural characterization of a flavoprotein induced by iron limitation in Methanobacterium ther-moautotrophicum Marburg. J Bacteriol 177 2436-41. 

Given this state of iron limitation, inputs of iron to the open ocean could result in enough new primary production to lower atmospheric carbon dioxide levels. Because CO2 is a greenhouse gas, cooling of the global atmosphere could result. This potential... 

The southern flank of the upwelling CDW sinks around the continent of Antarctica to become AABW The northern flank of upwelling CDW is transported by surface currents, first into the polar frontal zone (PFZ) where AAIW forms, and then into the subantarctic zone (SAZ ) where SAMW forms. At these latitudes, dust deposition is high enough to reduce iron limitation of the diatoms. As the surfece waters move northward. 

The DSi stripped out of the Southern Ocean s surfece waters at the site of SAMW formation is converted to BSi. This BSi eventually sinks into the deep waters (CDW), where it is remineralized to DSi and driven back south to be upwelled again into the surface waters. This trapping effect is a large part of why half of the global marine sedimentary sink of BSi is located in the Southern Ocean. South of 55°S, iron limitation is so severe, as compared to the rate of upweiiing supply of DSi, that the diatoms are not able to reduce silicic acid concentrations to zero. 

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