Publications by Benjamin Rappaz

Related publications (32)

Quantification of stored red blood cell fluctuations by time-lapse holographic cell imaging

Pierre Marquet, Gerardo Turcatti, Benjamin Rappaz, Michel Prudent, Manon Sandra Bardyn

We propose methods to quantitatively calculate the fluctuation rate of red blood cells with nanometric axial and millisecond temporal sensitivity at the single-cell level by using time-lapse holographic cell imaging. For this quantitative analysis, cell me ...

2018

Cellular dynamics explored with digital holographic microscopy

Benjamin Rappaz

Obtaining high resolution 3D quantitative images is critical for elucidating the relationship between cell dynamics and physiological or pathological processes. However the feasibility of such cellular dynamic studies is limited by the resolution of the 3D ...

EPFL2008

Determination of Transmembrane Water Fluxes in Neurons Elicited by Glutamate Ionotropic Receptors and by the Co-transporters KCC2 and NKCC1: A Digital Holographic Microscopy Study

Pierre Magistretti, Pierre Marquet, Christian Depeursinge, Nicolas Pavillon, Benjamin Rappaz, Pascal Jourdain, Daniel Boss

Digital holographic microscopy (DHM) is a noninvasive optical imaging technique that provides quantitative phase images of living cells. In a recent study, we showed that the quantitative monitoring of the phase signal by DHM was a simple label-free method ...

Society for Neuroscience2011

Image-Based Marker-Free Screening of GABA(A) Agonists, Antagonists, and Modulators

Pierre Marquet, Gerardo Turcatti, Benjamin Rappaz, Pascal Jourdain, Fabien Kuttler, Damiano Banfi

The ionotropic GABA(A) receptors represent the main target for different groups of widely used drugs having hypnotic and anxiolytic effects. So far, most approaches used to assess GABA activity involve invasive low -throughput electrophysiological techniqu ...

2019

Phosphoproteomics and morphology of stored human red blood cells treated by protein tyrosine phosphatases inhibitor

Gerardo Turcatti, Benjamin Rappaz, Romain Hamelin, Florence Armand

The process of protein phosphorylation is involved in numerous cell functions. In particular, phosphotyrosine (pY) has been reported to play a role in red blood cell (RBC) functions, including the cytoskeleton organization. During their storage before tran ...

2023

Quantitative phase-digital holographic microscopy: a new imaging modality to identify original cellular biomarkers of diseases

Pierre Magistretti, Pierre Marquet, Christian Depeursinge, Benjamin Rappaz, Pascal Jourdain

Quantitative phase microscopy (QPM) has recently emerged as a powerful label-free technique in the field of living cell imaging allowing to non-invasively measure with a nanometric axial sensitivity cell structure and dynamics. Since the phase retardation ...

Spie-Int Soc Optical Engineering2016

Red blood cells ageing markers: a multi-parametric analysis

Gerardo Turcatti, Niels Erik Lion, Benjamin Rappaz, Michel Prudent, Manon Sandra Bardyn

Background. Red blood cells collected in citrate-phosphate-dextrose can be stored for up to 42 days at 4 degrees C in saline-adenine-glucose-mannitol additive solution. During this controlled, but nevertheless artificial, ex vivo ageing, red blood cells ac ...

Simti Servizi Srl2017

Simultaneous Optical Recording in Multiple Cells by Digital Holographic Microscopy of Chloride Current Associated to Activation of the Ligand-Gated Chloride Channel GABA(A) Receptor

Pierre Marquet, Christian Depeursinge, Benjamin Rappaz, Daniel Boss, Pascal Jourdain

Chloride channels represent a group of targets for major clinical indications. However, molecular screening for chloride channel modulators has proven to be difficult and time-consuming as approaches essentially rely on the use of fluorescent dyes or invas ...

Public Library of Science2012

Automated tracking of temporal displacements of a red blood cell obtained by time-lapse digital holographic microscopy

Benjamin Rappaz

Red blood cell (RBC) phase images that are numerically reconstructed by digital holographic microscopy (DHM) can describe the cell structure and dynamics information beneficial for a quantitative analysis of RBCs. However, RBCs investigated with time-lapse ...

Optical Soc Amer2016

Simultaneous cell morphometry and refractive index measurement with dual- wavelength digital holographic microscopy and dye-enhanced dispersion of perfusion medium

Pierre Magistretti, Pierre Marquet, Christian Depeursinge, Benjamin Rappaz, Florian Charrière

Digital holographic microscopy (DHM) allows optical-path-difference (OPD) measurements with nanometric accuracy. OPD induced by transparent cells depends on both the refractive index (RI) of cells and their morphology. This Letter presents a dual-wavelengt ...

2008

Influence of shot noise on phase measurement accuracy in digital holographic microscopy

Pierre Marquet, Christian Depeursinge, Jonas Kühn, Tristan Colomb, Benjamin Rappaz, Florian Charrière

Digital Holographic Microscopy (DHM) is a single shot interferometric technique, which provides quantitative phase images with subwavelength axial accuracy. A short hologram acquisition time (down to microseconds), allows DHM to offer a reduced sensitivity ...

2007

Automated Dual-Mode Cell Monitoring To Simultaneously Explore Calcium Dynamics and Contraction-Relaxation Kinetics within Drug-Treated Stem Cell-Derived Cardiomyocytes

Pierre Marquet, Gerardo Turcatti, Benjamin Rappaz, Bokyoung Kim

This manuscript proposes a new dual-mode cell imaging system for studying the relationships between calcium dynamics and the contractility process of cardiomyocytes derived from human-induced pluripotent stem cells. Practically, this dual-mode cell imaging ...

AMER CHEMICAL SOC2023

Digital holographic microscopy: a quantitative label-free microscopy technique for phenotypic screening

Gerardo Turcatti, Benjamin Rappaz, Etienne Shaffer

Digital Holographic Microscopy (DHM) is a label-free imaging technique allowing visualization of transparent cells with classical imaging cell culture plates. The quantitative DHM phase contrast image provided is related both to the intracellular refractiv ...

2014

Spatial analysis of erythrocyte membrane fluctuations by digital holographic microscopy

Pierre Magistretti, Pierre Marquet, Christian Depeursinge, Benjamin Rappaz, Daniel Boss

Red blood cell (RBC) membrane fluctuations provide important insights into cell states. We present a spatial analysis of red blood cell membrane fluctuations by using digital holographic Microscopy (DHM). This interferometric and dye-free technique, posses ...

Elsevier2009

Spatially-Resolved Eigenmode Decomposition of Red Blood Cells Membrane Fluctuations Questions the Role of ATP in Flickering

Dimitri Nestor Alice Van De Ville, Pierre Magistretti, Pierre Marquet, Christian Depeursinge, Benjamin Rappaz, Daniel Boss

Red blood cells (RBCs) present unique reversible shape deformability, essential for both function and survival, resulting notably in cell membrane fluctuations (CMF). These CMF have been subject of many studies in order to obtain a better understanding of ...

Public Library Science2012

Marker-Free Automatic Quantification of Drug-Treated Cardiomyocytes with Digital Holographic Imaging

Pierre Marquet, Gerardo Turcatti, Benjamin Rappaz, Fabien Kuttler, Bokyoung Kim

We use quantitative phase digital holographic microscopy (QP-DHM) to image and quantify the beating movement of cardiomyocytes, derived from induced pluripotent stem cells (iPSCs), in control and drug-treated conditions. The development of an analysis algo ...

AMER CHEMICAL SOC2020

Submicrometer tomography of cells by multiple-wavelength digital holographic microscopy in reflection

Pierre Marquet, Christian Depeursinge, Jonas Kühn, Tristan Colomb, Nicolas Pavillon, Benjamin Rappaz, Frédéric Montfort

We present first results on a method enabling mechanical scanning-free tomography with submicrometer axial resolution by multiple-wavelength digital holographic microscopy. By sequentially acquiring reflection holograms and summing 20 wavefronts equally sp ...

2009

Automated multi-parameter measurement of cardiomyocytes dynamics with digital holographic microscopy

Pierre Marquet, Gerardo Turcatti, Benjamin Rappaz

Compounds tested during drug development may have adverse effects on the heart; therefore all new chemical entities have to undergo extensive preclinical assessment for cardiac liability. Conventional intensity-based imaging techniques are not robust enoug ...

Optical Society of America2015

Noninvasive characterization of the fission yeast cell cycle by monitoring dry mass with digital holographic microscopy

Pierre Magistretti, Pierre Marquet, Christian Depeursinge, Jonas Kühn, Tristan Colomb, Benjamin Rappaz, Viesturs Simanis

Digital holography microscopy (DHM) is an optical technique which provides phase images yielding quantitative information about cell structure and cellular dynamics. Furthermore, the quantitative phase images allow the derivation of other parameters, inclu ...

SPIE Society of Photo-optical Instrumentation Engineers2009

Comparative study of human erythrocytes by digital holographic microscopy, confocal microscopy, and impedance volume analyzer

Pierre Magistretti, Pierre Marquet, Christian Depeursinge, Benjamin Rappaz

Red blood cell (RBC) parameters such as morphology, volume, refractive index, and hemoglobin content are of great importance for diagnostic purposes. Existing approaches require complicated calibration procedures and robust cell perturbation. As a result, ...

2008