Effect of nutrient limitations

Williams, S. G., Greenwood, J. A., and Jones, C. W. 1994. The effect of nutrient limitation on glycerol uptake and metabolism in continuous cultures of Pseudomonas aeruginosa. Microbiol., 140, 2961-2969. 

Very recently, a study on the effect of nutrient limitation, salinity, and temperature on growth and YTX content in cultures of Adriatic Pr. reticulatum strains was carried out. Particular attention was paid to measure the difference between the YTX amount retained in cells and that released in... 

There is further scope for these types of experiments. One approach likely to be of value is to examine the interactive effects of a combination of stressors. For example, one might observe the interaction of a nutrient limitation with the exposure of cells to ultraviolet radiation (UVR). Because UVR inhibits photosynthesis we might expect to see different responses to the effects of nutrient limitation, for instance, on the rates of synthesis and relative concentration of macromolecules. 

Limitation of nitrogen causes a decline in the level of chlorophyll in algal cells, because N is a major constituent of the chlorophyll molecule. Under these conditions there is often a concomitant increase in carotenoids such as P-carotene within cells. Biologists studying the effect of nutrient limitation on aquatic ecosystems would like to measure the levels of these pigments in single cells so that the variability of response within phytoplankton populations to nutrient change can be accessed. Raman spectroscopy offers this potential, and... 

Multiple laboratory-scale CSTR digesters were also operated under similar conditions of temperature and MSW feedstock loading but differed with respect to retention time (10-30 d, ref. 69) and nutrient limitation 33). The fermentation parameters of nutrient limitation and retention time had varying effects on the... 

Lancelot C, Mathot S, Owens NJP (1986) Modelling protein synthesis, a step to an accurate estimate of net primary production the case of Phaeocystis pouchetii colonies in Belgian coastal waters. Mar Ecol Prog Ser 32 193-202 Lancelot C, Billen G, Sournia A, Weisse T, Colijin F, Veldhuis MJW, Davies A, Wassman P (1987) Phaeocystis blooms and nutrient enrichment in the continental coastal zones of the North Sea. AMBIO 16(1) 38 16 Lewandowska J, Kosakowska A (2004) Effect of iron limitation on cells of the diatom Cyclotella meneghiniana Kutzing. Oceanologia 46(2) 269-287 Lowther WT, Matthews BW (2000) Structure and function of the methionine aminopeptidases. Biochim Biophys Acta 1477 157-167... 

Hernandez, I., Peralta, G., Perez-Llorens, J. L., Vergara, J. J., and Niell, F. X. (1997). Biomass and dynamics of growth of Ulva species in Palmones River estuary. J. Phycol. 33, 764—772. Hernandez-Carmona, G., Robledo, D., and Serviere-Zaragoza, E. (2001). Effect of nutrient availability on Macrocystis pyrifera recruitment ad survival near its southern limit off Baja California. Bot. Mar. 

Variable results relating to urea supplementation of untreated straw have been reported with either increases (4, 10) or no effect (12) on voluntary intake and digestibility noted. As observed increases in energy intake were still too low to maintain body weight (10), this would suggest that the beneficial effects of nutrient supplementation of low-quality forages are limited unless accompanied by delignification procedures. 

HARRISON p J, THOMPSON p A and CALDERWOOD G s (1990) Effects of nutrient and light limitation on the biochemical composition of phytoplankton. Journal of Applied Phycology, 2,45-56. 

FIG. 24-24 Effect of recycle on steady-state concentrations of cell mass and limiting nutrient. 5-fold increase in cell concentration in separator. SiiLscripts denote fraction of cell concentrate recycled. 

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