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A tale of three taxes: photo-gyro-gravitactic bioconvection

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A tale of three taxes : photo-gyro-gravitactic bioconvection. / Williams, C Rosie; Bees, Martin Alan.

In: The Journal of Experimental Biology, Vol. 214, No. Pt 14, 15.07.2011, p. 2398-408.

Research output: Contribution to journalArticle

Harvard

Williams, CR & Bees, MA 2011, 'A tale of three taxes: photo-gyro-gravitactic bioconvection', The Journal of Experimental Biology, vol. 214, no. Pt 14, pp. 2398-408. https://doi.org/10.1242/jeb.051094

APA

Williams, C. R., & Bees, M. A. (2011). A tale of three taxes: photo-gyro-gravitactic bioconvection. The Journal of Experimental Biology, 214(Pt 14), 2398-408. https://doi.org/10.1242/jeb.051094

Vancouver

Williams CR, Bees MA. A tale of three taxes: photo-gyro-gravitactic bioconvection. The Journal of Experimental Biology. 2011 Jul 15;214(Pt 14):2398-408. https://doi.org/10.1242/jeb.051094

Author

Williams, C Rosie ; Bees, Martin Alan. / A tale of three taxes : photo-gyro-gravitactic bioconvection. In: The Journal of Experimental Biology. 2011 ; Vol. 214, No. Pt 14. pp. 2398-408.

Bibtex - Download

@article{7cb6d59f0eb5491582fb06d333af980e,
title = "A tale of three taxes: photo-gyro-gravitactic bioconvection",
abstract = "The term bioconvection encapsulates the intricate patterns in concentration, due to hydrodynamic instabilities, that may arise in suspensions of non-neutrally buoyant, biased swimming microorganisms. The directional bias may be due to light (phototaxis), gravity (gravitaxis), a combination of viscous and gravitational torques (gyrotaxis) or other taxes. The aim of this study is to quantify experimentally the wavelength of the initial pattern to form from an initially well-mixed suspension of unicellular, swimming green algae as a function of concentration and illumination. As this is the first such study, it is necessary to develop a robust and meticulous methodology to achieve this end. The phototactic, gyrotactic and gravitactic alga Chlamydomonas augustae was employed, with various red or white light intensities from above or below, as the three not altogether separable taxes were probed. Whilst bioconvection was found to be unresponsive to changes in red light, intriguing trends were found for pattern wavelength as a function of white light intensity, depending critically on the orientation of the illumination. These trends are explored to help unravel the mechanisms. Furthermore, comparisons are made with theoretical predictions of initial wavelengths from a recent model of photo-gyrotaxis, encouragingly revealing good qualitative agreement.",
author = "Williams, {C Rosie} and Bees, {Martin Alan}",
year = "2011",
month = jul,
day = "15",
doi = "10.1242/jeb.051094",
language = "English",
volume = "214",
pages = "2398--408",
journal = "The Journal of Experimental Biology",
issn = "1477-9145",
number = "Pt 14",

}

RIS (suitable for import to EndNote) - Download

TY - JOUR

T1 - A tale of three taxes

T2 - photo-gyro-gravitactic bioconvection

AU - Williams, C Rosie

AU - Bees, Martin Alan

PY - 2011/7/15

Y1 - 2011/7/15

N2 - The term bioconvection encapsulates the intricate patterns in concentration, due to hydrodynamic instabilities, that may arise in suspensions of non-neutrally buoyant, biased swimming microorganisms. The directional bias may be due to light (phototaxis), gravity (gravitaxis), a combination of viscous and gravitational torques (gyrotaxis) or other taxes. The aim of this study is to quantify experimentally the wavelength of the initial pattern to form from an initially well-mixed suspension of unicellular, swimming green algae as a function of concentration and illumination. As this is the first such study, it is necessary to develop a robust and meticulous methodology to achieve this end. The phototactic, gyrotactic and gravitactic alga Chlamydomonas augustae was employed, with various red or white light intensities from above or below, as the three not altogether separable taxes were probed. Whilst bioconvection was found to be unresponsive to changes in red light, intriguing trends were found for pattern wavelength as a function of white light intensity, depending critically on the orientation of the illumination. These trends are explored to help unravel the mechanisms. Furthermore, comparisons are made with theoretical predictions of initial wavelengths from a recent model of photo-gyrotaxis, encouragingly revealing good qualitative agreement.

AB - The term bioconvection encapsulates the intricate patterns in concentration, due to hydrodynamic instabilities, that may arise in suspensions of non-neutrally buoyant, biased swimming microorganisms. The directional bias may be due to light (phototaxis), gravity (gravitaxis), a combination of viscous and gravitational torques (gyrotaxis) or other taxes. The aim of this study is to quantify experimentally the wavelength of the initial pattern to form from an initially well-mixed suspension of unicellular, swimming green algae as a function of concentration and illumination. As this is the first such study, it is necessary to develop a robust and meticulous methodology to achieve this end. The phototactic, gyrotactic and gravitactic alga Chlamydomonas augustae was employed, with various red or white light intensities from above or below, as the three not altogether separable taxes were probed. Whilst bioconvection was found to be unresponsive to changes in red light, intriguing trends were found for pattern wavelength as a function of white light intensity, depending critically on the orientation of the illumination. These trends are explored to help unravel the mechanisms. Furthermore, comparisons are made with theoretical predictions of initial wavelengths from a recent model of photo-gyrotaxis, encouragingly revealing good qualitative agreement.

UR - http://www.scopus.com/inward/record.url?scp=79959552754&partnerID=8YFLogxK

U2 - 10.1242/jeb.051094

DO - 10.1242/jeb.051094

M3 - Article

C2 - 21697432

VL - 214

SP - 2398

EP - 2408

JO - The Journal of Experimental Biology

JF - The Journal of Experimental Biology

SN - 1477-9145

IS - Pt 14

ER -