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oapen-20.500.12657-323332022-02-08T13:09:38Z Chapter 11 Photoacoustics — A Novel Tool for the Study of Aquatic Photosynthesis Pinchasov-Grinblat, Yulia Dubinsky, Zvy photosynthesis photoacoustics photosynthesis photoacoustics Algae Chlorophyll Nannochloropsis Phaeodactylum tricornutum Thermal expansion bic Book Industry Communication::P Mathematics & science::PD Science: general issues The photoacoustic method allows direct determination of the energy-storage efficiency of photosynthesis by relating the energy stored by it to the total light energy absorbed by the plant material (Canaani et al., 1988; Malkin & Cahen, 1979; Malkin et al., 1990). These authors applied the photoacoustic method to leaves in the gas phase, where brief pulses caused concomitant pulses of oxygen that caused a pressure transient detected by a microphone. This method is based on the conversion of absorbed light to heat. Depending on the efficiency of the photosynthetic system, a variable fraction of the absorbed light energy is stored, thereby affecting the heat evolved and the resulting photoacoustic signal. The higher the photosynthetic efficiency, the greater will be the difference between the stored energy with and without ongoing photosynthesis (Cha & Mauzerall, 1992). These authors collected microalgal cells onto a filter and studied them by an approach similar to that previously used with leaves. In both cases, the oxygen signal is combined with that of thermal expansion resulting from conversion of the fraction of the light energy in the pulse that is not stored by photochemistry. 2019-10-04 14:35:28 2020-04-01T14:06:46Z 2016-08-01 23:55 2019-10-04 14:35:28 2020-04-01T14:06:46Z 2016-12-31 23:55:55 2019-10-04 14:35:28 2020-04-01T14:06:46Z 2020-04-01T14:06:46Z 2013 chapter 612613 OCN: 1030819229 http://library.oapen.org/handle/20.500.12657/32333 eng application/pdf n/a 612613.pdf InTechOpen Photosynthesis 10.5772/56600 10.5772/56600 09f6769d-48ed-467d-b150-4cf2680656a1 317cae62-9bf0-47c7-900c-8e411bf5777d 7292b17b-f01a-4016-94d3-d7fb5ef9fb79 7292b17b-f01a-4016-94d3-d7fb5ef9fb79 European Research Council (ERC) 1 249930 309646 FP7 FP7 FP7 Ideas: European Research Council FP7-IDEAS-ERC - Specific Programme: "Ideas" Implementing the Seventh Framework Programme of the European Community for Research, Technological Development and Demonstration Activities (2007 to 2013) FP7 Ideas: European Research Council FP7-IDEAS-ERC - Specific Programme: "Ideas" Implementing the Seventh Framework Programme of the European Community for Research, Technological Development and Demonstration Activities (2007 to 2013) open access
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The photoacoustic method allows direct determination of the energy-storage efficiency of photosynthesis by relating the energy stored by it to the total light energy absorbed by the plant material (Canaani et al., 1988; Malkin & Cahen, 1979; Malkin et al., 1990). These authors applied the photoacoustic method to leaves in the gas phase, where brief pulses caused concomitant pulses of oxygen that caused a pressure transient detected by a microphone. This method is based on the conversion of absorbed light to heat. Depending on the efficiency of the photosynthetic system, a variable fraction of the absorbed light energy is stored, thereby affecting the heat evolved and the resulting photoacoustic signal. The higher the photosynthetic efficiency, the greater will be the difference between the stored energy with and without ongoing photosynthesis (Cha & Mauzerall, 1992). These authors collected microalgal cells onto a filter and studied them by an approach similar to that previously used with leaves. In both cases, the oxygen signal is combined with that of thermal expansion resulting from conversion of the fraction of the light energy in the pulse that is not stored by photochemistry.
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