Green algae scatter off sharp viscosity gradients

Abstract We study the behaviour of the green alga Chlamydomonas reinhardtii (CR) in the presence of neighbouring regions of different viscosity. We show that the velocity and angular diffusion of the algae decreases when the viscosity of the surrounding medium is increased. We report on a phenomenon...

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Autores principales:	Simone Coppola, Vasily Kantsler
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/679cb49d829a49e0bda6088de5052851
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spelling	oai:doaj.org-article:679cb49d829a49e0bda6088de50528512021-12-02T14:01:22ZGreen algae scatter off sharp viscosity gradients10.1038/s41598-020-79887-72045-2322https://doaj.org/article/679cb49d829a49e0bda6088de50528512021-01-01T00:00:00Zhttps://doi.org/10.1038/s41598-020-79887-7https://doaj.org/toc/2045-2322Abstract We study the behaviour of the green alga Chlamydomonas reinhardtii (CR) in the presence of neighbouring regions of different viscosity. We show that the velocity and angular diffusion of the algae decreases when the viscosity of the surrounding medium is increased. We report on a phenomenon occurring when the algae try to cross from a region of low viscosity to a highly viscous one, which causes CR to re-orient and scatter away from the interface if it is approached at a sufficiently small angle. We highlight that the effect does not occur for CR crossing from high to low viscosity regions. Lastly we show that algae do not concentrate in the region of high viscosity despite them swimming slower there. On the contrary, they concentrate in the region of low viscosity or maintain a uniform concentration profile, depending on the viscosity ratio between the two regions.Simone CoppolaVasily KantslerNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-7 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Simone Coppola Vasily Kantsler Green algae scatter off sharp viscosity gradients
description	Abstract We study the behaviour of the green alga Chlamydomonas reinhardtii (CR) in the presence of neighbouring regions of different viscosity. We show that the velocity and angular diffusion of the algae decreases when the viscosity of the surrounding medium is increased. We report on a phenomenon occurring when the algae try to cross from a region of low viscosity to a highly viscous one, which causes CR to re-orient and scatter away from the interface if it is approached at a sufficiently small angle. We highlight that the effect does not occur for CR crossing from high to low viscosity regions. Lastly we show that algae do not concentrate in the region of high viscosity despite them swimming slower there. On the contrary, they concentrate in the region of low viscosity or maintain a uniform concentration profile, depending on the viscosity ratio between the two regions.
format	article
author	Simone Coppola Vasily Kantsler
author_facet	Simone Coppola Vasily Kantsler
author_sort	Simone Coppola
title	Green algae scatter off sharp viscosity gradients
title_short	Green algae scatter off sharp viscosity gradients
title_full	Green algae scatter off sharp viscosity gradients
title_fullStr	Green algae scatter off sharp viscosity gradients
title_full_unstemmed	Green algae scatter off sharp viscosity gradients
title_sort	green algae scatter off sharp viscosity gradients
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/679cb49d829a49e0bda6088de5052851
work_keys_str_mv	AT simonecoppola greenalgaescatteroffsharpviscositygradients AT vasilykantsler greenalgaescatteroffsharpviscositygradients
_version_	1718392144274653184

Green algae scatter off sharp viscosity gradients

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