Mesocosm bloom experiment results with the coccolithophore Emiliania huxleyi

We investigated the effect of CO2 and primary production on the carbon isotopic fractionation of alkenones and particulate organic matter (POC) during a natural phytoplankton bloom dominated by the coccolithophore Emiliania huxleyi. In nine semi-closed mesocosms (~11 m**3 each), three different CO2 partial pressures (pCO2) in triplicate represented glacial (~180 ppmv CO2), present (380 ppmv CO2), and year 2100 (~710 ppmv CO2) CO2 conditions. The largest shift in alkenone isotopic composition (4-5 per mil) occurred during the exponential growth phase, regardless of the CO2 concentration in the respective treatment. Despite the difference of ~500 ppmv, the influence of pCO2 on isotopic fractionation was marginal (1-2 per mil). During the stationary phase, E. huxleyi continued to produce alkenones, accumulating cellular concentrations almost four times higher than those of exponentially dividing cells. Our isotope data indicate that, while alkenone production was maintained, the interaction of carbon source and cellular uptake dynamics by E. huxleyi reached a steady state. During stationary phase, we further observed a remarkable increase in the difference between d13C of bulk organic matter and of alkenones spanning 7-12 per mil. We suggest that this phenomenon is caused mainly by a combination of extracellular release of 13C-enriched polysaccharides and subsequent particle aggregation induced by the production of transparent exopolymer particles (TEP).

The coupled trickling filter-activated sludge process : design and performance /

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Report on tests of welding filter plates /

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Fine solids removal following combined chemical-trickling filter treatment /

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Wastewater stabilization lagoon : intermittent sand filter systems /

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High daily rate trickling filter performance : under the direction of the Board of State Health Commissioners, Upper Mississippi River Basin Sanitaton Agreement /

Includes bibliographical references.

Long term recharge of trickling filter effluent into sand /

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A preliminary investigation of the effectiveness of a diatomite filter in the removal of radioactive phosphorus from water /

"November 1, 1951."

Evaluation of filter flammability and filter bank fire detection systems /

"U.S. Atomic Energy Commission Contract AT(29-1)-1106."

Designs of filter plants, January 1900.

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Digital filter synthesis

"Cornell Aeronautical Laboratory, Inc. has assigned Report no. XA-2177-B-1 to this document."

Margaret: a tale of the real and the ideal, blight and bloom; including sketches of a place not before described, called Mons Christi ...

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Effects of filter response on analysis of aircraft noise data /

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California fruit and nut crops: acreage, production, utilization and value, 1949-1961; bloom, harvesting and marketing dates and principal producing counties.

Revises and updates California. Dept. of Agriculture. State publication 261.

Flowers that bloom in the spring : spring comes to Illinois--and with it come wild flowers which are part of the picture of springtime /

Includes index.