Journal article Open Access

Parallelisable non-invasive biomass, fitness and growth measurement of macroalgae and other protists with nephelometry

Calmes, Benoit; Strittmatter, Martina; Jacquemin, Bertrand; Perrineau, Marie-Mathilde; Rousseau, Céline; Badis, Yacine; Cock, J. Mark; Destombe, Christophe; Valero, Myriam; Gachon, Claire M.M.


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            <foaf:name>Scottish Association for Marine Science, Scottish Marine Institute, PA37 1QA Oban, United Kingdom ; Sorbonne Université, CNRS, Algal Genetics Group, UMR 8227, Laboratory of Integrative Biology of Marine Models, Station Biologique de Roscoff, CS 90074, F-29688, Roscoff, France</foaf:name>
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        <foaf:name>Gachon, Claire M.M.</foaf:name>
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            <foaf:name>Scottish Association for Marine Science, Scottish Marine Institute, PA37 1QA Oban, United Kingdom ; Muséum National d'Histoire Naturelle, CNRS, UMR 7245 - Molécules de Communication et Adaptation des Micro-organismes , CP 54, 57 rue Cuvier, 75005 Paris, France</foaf:name>
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    <dct:title>Parallelisable non-invasive biomass, fitness and growth measurement of macroalgae and other protists with nephelometry</dct:title>
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    <dcat:keyword>Biomass</dcat:keyword>
    <dcat:keyword>Nephelometry</dcat:keyword>
    <dcat:keyword>Algal cultivation</dcat:keyword>
    <dcat:keyword>Biotechnology</dcat:keyword>
    <dcat:keyword>Phenotyping</dcat:keyword>
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    <dct:description>&lt;p&gt;With the exponential development of algal aquaculture and blue biotechnology, there is a strong demand for simple, inexpensive, high-throughput, quantitative phenotyping assays to measure the biomass, growth and fertility of algae and other marine protists. Here, we validate nephelometry, a method that relies on measuring the scattering of light by particles in suspension, as a non-invasive tool to measure in real-time the biomass of aquatic micro-organisms, such as microalgae, filamentous algae, as well as non-photosynthetic protists. Nephelometry is equally applicable to optic density and chlorophyll fluorescence measurements for the quantification of some microalgae, but outperforms other spectroscopy methods to quantify the biomass of biofilm-forming and filamentous algae, highly pigmented species and non-photosynthetic eukaryotes. Thanks to its insensitivity to the sample&amp;#39;s pigmentation, nephelometry is also the method of choice when chlorophyll content varies between samples or time points, for example due to abiotic stress or pathogen infection. As examples, we illustrate how nephelometry can be combined with fluorometry or image analysis to monitor the quantity and time-course of spore release in fertile kelps or the progression of symptoms in diseased algal cultures.&lt;/p&gt;</dct:description>
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