Measurement of cell velocity distributions in populations of motile algae

V. A. Vladimirov, M. S.C. Wu, T. J. Pedley*, P. V. Denissenko, S. G. Zakhidova

*المؤلف المقابل لهذا العمل

نتاج البحث: المساهمة في مجلةArticleمراجعة النظراء

40 اقتباسات (Scopus)


The self-propulsion of unicellular algae in still ambient fluid is studied using a previously reported laser-based tracking method, supplemented by new tracking software. A few hundred swimming cells are observed simultaneously and the average parameters of the cells' motility are calculated. The time-dependent, two-dimensional distribution of swimming velocities is measured and the three-dimensional distribution is recovered by assuming horizontal isotropy. The mean and variance of the cell turning angle are quantified, to estimate the reorientation time and rotational diffusivity of the bottom-heavy cell. The cells' phototactic and photokinetic responses to the laser light are evaluated. The results are generally consistent both with earlier assumptions about the nature of cell swimming and quantitative measurements, appropriately adjusted. The laser-based tracking method, which makes it possible to average over a large number of motile objects, is shown to be a powerful tool for the study of microorganism motility.

اللغة الأصليةEnglish
الصفحات (من إلى)1203-1216
عدد الصفحات14
دوريةJournal of Experimental Biology
مستوى الصوت207
رقم الإصدار7
المعرِّفات الرقمية للأشياء
حالة النشرPublished - مارس 2004

ASJC Scopus subject areas

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