O
Oscar N. Mesquita
Researcher at Universidade Federal de Minas Gerais
Publications - 57
Citations - 1514
Oscar N. Mesquita is an academic researcher from Universidade Federal de Minas Gerais. The author has contributed to research in topics: Optical tweezers & Microscopy. The author has an hindex of 23, co-authored 57 publications receiving 1376 citations. Previous affiliations of Oscar N. Mesquita include Rockefeller University & Princeton University.
Papers
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Journal ArticleDOI
Gramicidin Channel Kinetics under Tension
Mark Goulian,Oscar N. Mesquita,Oscar N. Mesquita,Deborah Kuchnir Fygenson,Claus Helix Nielsen,Olaf S. Andersen,Albert Libchaber,Albert Libchaber +7 more
TL;DR: The effect of tension on dimerization kinetics of the channel-forming peptide gramicidin A is measured by aspirating large unilamellar vesicles into a micropipette electrode and it is found that the dimer formation rate increases by a factor of 5 as tension ranges from 0 to 4 dyn/cm.
Journal ArticleDOI
Fluctuations and transport in a stirred fluid with a mean gradient
Jerry P. Gollub,Jerry P. Gollub,Jerry P. Gollub,J. Clarke,J. Clarke,J. Clarke,Morteza Gharib,Morteza Gharib,Morteza Gharib,B. R. Lane,B. R. Lane,B. R. Lane,Oscar N. Mesquita,Oscar N. Mesquita,Oscar N. Mesquita +14 more
TL;DR: The effective thermal diffusivity D* and the probability distribution of temperature fluctuations are measured in a stirred fluid across which a temperature gradient is maintained.
Journal ArticleDOI
Towards absolute calibration of optical tweezers.
Nathan B. Viana,Marcio S. Rocha,Oscar N. Mesquita,A. Mazolli,P. A. Maia Neto,H. M. Nussenzveig +5 more
TL;DR: In this paper, the results of the Mie-Debye-spherical aberration (MDSA) theory were investigated for absolute force calibration of optical tweezers, and the results asymptotically approach geometrical optics in the mean over size intervals, as they should, and this already happens for size parameters not much larger than unity.
Journal ArticleDOI
Absolute calibration of optical tweezers
Nathan B. Viana,A. Mazolli,P. A. Maia Neto,H. M. Nussenzveig,Marcio S. Rocha,Oscar N. Mesquita +5 more
TL;DR: In this paper, a first-principles theory of trapping forces with no adjustable parameters, corrected for spherical aberration, is experimentally tested, and the authors find generally good agreement for the transverse trap stiffness as a function of microsphere radius for a broad range of radii.
Journal ArticleDOI
Cell surface fluctuations studied with defocusing microscopy
Ubirajara Agero,Carlos H. Monken,Catherine Ropert,Ricardo T. Gazzinelli,Ricardo T. Gazzinelli,Oscar N. Mesquita +5 more
TL;DR: The methods developed can be of utility to assess the importance of cytoskeleton motility in the dynamics of cellular processes such as phagocytosis exhibited by macrophages and measured contrasts are in excellent agreement with the theoretical model.