Algal Photosynthesis by Richard J. Geider, Bruce A. Osborne (auth.)

By Richard J. Geider, Bruce A. Osborne (auth.)

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5 to 24% of total organic 14C production in exponentially growing cultures. Glycolic acid, a product of photorespiratory activity, varied from < 1 to almost 40% of DOC release. 3%. 1. Percent extracellular release (PER) and the relative contribution of low- and high-molecular-weight substances to D0 14C. 4 20 80 Nalewajko and Schindler (1976) Steinberg (1978) Watanabe (1980) Sondergaard and Schierup (1982) Chrost and Faust (1983) Iturriaga and Zsolnay (1983) Jensen (1983) Cole et al. 1 1 18 8 4 42 13 5 4 65 33 7 14 30 26 19 7 8 14 3 8 20 18 26 11 45 15 24 2 6 0 0 8 8 50 70 15 10 45 85 10 50 25 35 5 15 35 20 55 80 55 40 48 48 42 25 26 50 75 65 100 60 90 90 30 20 60 60 55 15 85 40 65 60 90 85 55 75 35 0 30 30 80 52 52 58 15 25 After Sundh (1989).

1985; Fuhrman, 1987; Sundh, 1989), which would lead to an underestimate of the amount of D0 14C produced. Filtration must be carried out with a low vacuum to avoid rupturing fragile cells, and membrane filters or polycarbonate sieves may cause less damage than glass fiber filters (Goldman and Dennett, 1985). For microalgal samples, the pore size of the filter must be small enough to retain all photosynthetic cells, and several comparisons of the efficiency of various types of filters for retaining chlorophyll a, particulate 14C, and particulate organic carbon have been made (Sheldon, 1972; Salonen, 1979; Li, 1986; Taguchi and Laws, 1988).

1984; Kieber and Mopper, 1987). Chapter 2 Using Isotopes to Measure Gas Exchange Tracers have long been used in photosynthesis experiments to provide information that cannot be obtained by net gas exchange techniques. The radioactive tracer 14C, was instrumental in determining the biochemical pathways of CO2 fixation (Bassham and Calvin, 1957). In addition, assimilation of inorganic 14C has become a standard technique for measuring photosynthesis of unicellular aquatic plants, largely replacing net oxygen exchange, particularly under oligotrophic conditions.

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