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Holographic and single beam optical manipulation of hyphal growth in filamentous fungi

D R Burnham1,3, G D Wright2, N D Read2 and D McGloin1,3

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We report on the ability of holographic light fields to alter the normal growth patterns of filamentous fungi. The light fields are produced on a microscopic scale by borrowing methods from the field of optical tweezers, but without the aim of directly trapping or manipulating objects. Extended light fields are shown to redirect and constrict hyphal tip growth, and induce hyphal branching in a highly reproducible manner. The merits of using discrete and continuous light fields produced using a spatial light modulator are discussed and the use of three-dimensional 'pseudowalls' of light to control the growth patterns is reported. We also demonstrate the dependence of hyphal tip growth on the wavelength of light, finding that less power is needed at shorter wavelengths to effect changes in the growth dynamics of fungal hyphae.


PACS

87.80.Cc Optical trapping

87.17.Ee Growth and division

87.80.Fe Micromanipulation of biological structures

Subjects

Instrumentation and measurement

Medical physics

Biological physics

Dates

Issue 8 (August 2007)

Received 2 January 2007, accepted for publication 31 May 2007

Published 24 July 2007



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