25 citations · 42 across the 6 of their papers we have counts for
6 papers
Theory of Cell Body Lensing and Phototaxis Sign Reversal in "Eyeless" Mutants of
Sumit Kumar Birwa, Ming Yang, Adriana I. Pesci +1
Phototaxis of many species of green algae relies upon directional sensitivity of their membrane-bound photoreceptors, which arises from the presence of a pigmented "eyespot" behind…
Algal Optics
Ming Yang, Sumit Kumar Birwa, Raymond E. Goldstein
Nearly a decade ago it was discovered that the spherical cell body of the alga can act as a lens to concentrate incoming light onto the cell's membrane-…
Spatiotemporal distribution of the glycoprotein pherophorin II reveals stochastic geometry of the growing ECM of
Benjamin von der Heyde, Anand Srinivasan, Sumit Kumar Birwa +4
The evolution of multicellularity involved the transformation of a simple cell wall of unicellular ancestors into a complex, multifunctional extracellular matrix (ECM). A suitable…
Effect of Wall Friction on 2D Hopper Flow
Neil Shah, Brenda Carballo-Ramirez, Sumit Kumar Birwa +2
We report here on experiments and simulations examining the effect of changing wall friction on the gravity-driven flow of spherical particles in a vertical hopper. In 2D experimen…
Ergodicity breaking dynamics of arch collapse
Carl Merrigan, Sumit Kumar Birwa, Shubha Tewari +1
Gravity driven flows such as in hoppers and silos are susceptible to clogging due to the formation of arches at the exit whose failure is the key to re-initiation of flow. In vibra…
Is there solid-on-solid contact in a sphere-wall collision in a viscous fluid?
Sumit Kumar Birwa, G. Rajalakshmi, Rama Govindarajan +1
We study experimentally the collision between a sphere falling through a viscous fluid, and a solid plate below. It is known that there is a well-defined threshold Stokes number ab…