Stanford University

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ESS-Seminar Speaker Series: Prof. Manu Prakash, Associate Professor of Bioengineering at Stanford

Wednesday, Oct 28, 2020 11:30 AM
Via Zoom
More Info:
ESS-Seminar Speaker Series: Prof. Manu Prakash, Associate Professor of Bioengin…
Department of Earth System Science

Please join us for the Virtual Fall Quarter Seminar Series with Guest Speaker, Manu Prakash, Ph.D. Title: That sinking feeling: Gravity and its role in how life navigates the oceans. Abstract: Marine plankton exhibit a Diel Vertical Migration with vertical displacement scales from several tens to hundreds of meters. Even at the scale of small phytoplankton and zooplankton (100 μm to a few mm) the interaction of this vertical swimming behavior with hydrodynamics affects the large-scale distribution of populations in the ocean and is thus an important component of understanding ocean ecology. However, concurrently observing organismal physiology and behavior is challenging due to the vast separation of scales involved. Resolving physiological processes involves sub-cellular (micron) resolution while tracking freely swimming organisms implies vertical displacements of several meters. We present a simple solution to this problem in the form of a“hydrodynamic treadmill” incorporated into a table-top scale-free vertical tracking microscope [1]. We use this method to study the behavior of freely swimming marine plankton, both in lab and on-board a research vessel, revealing a rich space of dynamic behavioral states in marine micro-organism. Time permitting, I will also share our efforts in bringing oceanography to “seatizens” around the world by democratizing tools for science accessible to sailors across the world [2, 3].

(1)Krishnamurthy, D., Li, H., Benoit du Rey, F. et al. Scale-free vertical tracking microscopy. Nat Methods (2020). (2) PlanktonScope: Affordable modular imaging platform for citizen oceanography Thibaut Pollina, Adam G. Larson, Fabien Lombard,Hongquan Li, Sebastien Colin, Colomban de Vargas, Manu Prakash bioRxiv 2020.04.23.056978; doi: (3) Plankton Planet: ‘seatizen’ oceanography to assess open ocean life at the planetary scale Colomban de Vargas et al bioRxiv 2020.08.31.263442;

A special thanks to Karen Casciotti for bringing this speaker to us. Also, thanks to Morgan O'Neill and Jamie Jones for co-instructing and running this Virtual Seminar Series this Fall by bringing you experts in the fields as we learn from them.

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Password: 916773

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