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PEOPLE@HES-SO - Verzeichnis der Mitarbeitenden und Kompetenzen
PEOPLE@HES-SO - Verzeichnis der Mitarbeitenden und Kompetenzen

PEOPLE@HES-SO
Verzeichnis der Mitarbeitenden und Kompetenzen

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Roux Adrien

Roux Adrien

Professeur HES associé

Hauptkompetenzen

Bio-engineering

Biology

In vitro cell culture

Tissue Engineering

Biocompatibilité

Organ-on-chip

Biochip

  • Kontakt

  • Lehre

  • Forschung

  • Publikationen

  • Konferenzen

Hauptvertrag

Professeur HES associé

Büro: Campus Biotech - B3-02 218.118

Haute école du paysage, d'ingénierie et d'architecture de Genève
Rue de la Prairie 4, 1202 Genève, CH
hepia
Bereich
Technique et IT
Hauptstudiengang
Microtechniques
BSc HES-SO en Microtechniques - Haute école du paysage, d'ingénierie et d'architecture de Genève
  • Biologie
MSc HES-SO en Engineering - HES-SO Master
  • Biologie
MSc HES-SO en Engineering - HES-SO Master
  • Bio-Ingénierie
BSc HES-SO en Microtechniques - Haute école du paysage, d'ingénierie et d'architecture de Genève
  • Bio-Ingénierie
Master en sciences biomédicales - UNIGE
  • Technologie médicale HS001
  • Parcours d'un dispositif médical / 14HS002

Abgeschlossen

PACMan_ Outil portable d'analyse de la fertilité masculine basée sur la mesure de la concentration et de la mobilité des spermatozoïdes
AGP

Rolle: Mitgesuchsteller/in

Requérant(e)s: IICT, Raileanu Laura Elena, IICT

Financement: HES-SO Rectorat

Description du projet : L'infertilité masculine est une réalité de plus en plus inquiétante comme le confirment des études récentes qui constatent une baisse de 50% de la concentration et de 60% du nombre total de spermatozoïdes entre 1973 et 2011. Une baisse qualitative du sperme en termes de mobilité et de morphologie a aussi été constatée. Actuellement les analyses d'infertilité masculine sont effectuées dans des laboratoires spécialisés dotés d'équipements de pointe, encombrants et onéreux. Réalisées par du personnel qualifié, elles sont chronophages et coûteuses. Pour ces raisons, ainsi que d'autres de type culturel, le public sous-estime le problème et méconnaît les possibilités de traitement. Chez les animaux d'élevage l'insémination artificielle, bien que chère selon les espèces, est prépondérante. De ce fait, les vétérinaires souhaiteraient pouvoir garantir à leurs clients éleveurs la qualité des produits fournis par un test rapide et bon marché « sur site ». Par ailleurs, chez certains animaux la qualité du sperme se dégrade si rapidement qu'une analyse en laboratoire est impossible (ex. : le sperme des truites a une durée de vie moyenne de 24s). L'objectif de ce projet a été de concevoir un appareil portable à bas coût, utilisable hors des conditions de laboratoire, permettant d'effectuer les mesures essentielles de concentration et de motilité des spermatozoïdes. La technologie développée permet de garantir une analyse standardisée, fiable et rapide. Les contacts pris avec des entreprises spécialisées dans le domaine de la sélection génétique et de la reproduction animale (Swissgenetics) ou avec des institutions dédiées à l'étude du monde animal (La Maison de la Rivière) ont montré leur intérêt par rapport à notre appareil. Également l'intérêt est marqué du côté des fournisseurs (de logiciel et de matériel) ainsi que des laboratoires actifs dans le domaine de la reproduction humaine (AKYMed, Inndix). Pour garantir un coût minimum et son accessibilité, l'appareil conçu et développé se limite aux parties optiques et mécaniques strictement nécessaires, il est accompagné d'une application mobile regroupant les fonctionnalités nécessitant une puissance de calcul et les interactions avec l'utilisateur. En particulier l'application mobile permet à l'utilisateur de contrôler l'appareil, elle le guide lors du processus d'acquisition des images, elle effectue l'analyse des images, et finalement elle restitue les résultats en quelques secondes. L'instrument a été testé avec des échantillons de sperme de différentes espèces, en particulier avec des échantillons de taureau sur lesquels les paramètres de concentration et de motilité mesurés avec notre dispositif (hardware + algorithmes) ont été validés en les comparant avec ceux obtenus avec un microscope à contraste de phase standard et un logiciel CASA (Computer-Assisted Sperm Analysis) commercial, selon les normes de l'OMS. La solution proposée se différencie des appareils similaires existants sur le marché en apportant, en plus de la mesure de la concentration, celle de la motilité. Elle ouvre également la possibilité de considérer l'utilisation de notre appareil sur le marché de la reproduction humaine. Une valorisation de l'instrument est en cours de discussion avec la société AKYmed Sàrl, leader suisse des logiciels CASA qui est intéressée à pouvoir continuer le développement de notre technologie dans le cadre d'un projet Innosuisse.

Forschungsteam innerhalb von HES-SO: Medwed Gregory , Dutoit Fabien , Petraglio Enrico , Dassatti Alberto , Raileanu Laura Elena , Gomez Baisac Loris , Roux Adrien , Bouiller Grégoire , Cuisenaire Olivier , Vu Basile , Hänggi Gregory , Heuschkel Marc , Rochat Antoine , Dessaules Loïc , Najdenovska Elena

Partenaires académiques: ReDS; IICT; hepia inSTI; Raileanu Laura Elena, IICT

Durée du projet: 01.02.2020 - 04.04.2022

Montant global du projet: 145'200 CHF

Statut: Abgeschlossen

Swiss Centre Human Applied Toxicology.
AGP

Rolle: Mitarbeiter

Financement: SCAHT; hepia inSTI; hepia inSTI

Description du projet : Human in vitro 2D and 3D models of mature neural networks for neurotoxicity assessment.

Forschungsteam innerhalb von HES-SO: Trinchan Dominique , Nikles Laetitia , Roux Adrien , Baxarias Fontaine Axel , Müller Yoann , Mor Flavio , Crovadore Julien , Stoppini Luc

Durée du projet: 01.01.2019 - 31.12.2019

Montant global du projet: 240'000 CHF

Statut: Abgeschlossen

"Development and implementation of Grouping and Safe-by-Design approaches within regulatory frameworks (NanoREG II)".
AGP

Rolle: Mitarbeiter

Requérant(e)s: hepia inSTI, Stoppini Luc, hepia inSTI

Financement: SEFRI

Description du projet : "One of the greatest challenges facing regulators in the ever changing landscape of novel nano-materials is how to design and implement a regulatory process which is robust enough to deal with a rapidly diversifying system of manufactured nanomaterials (MNM) over time. Not only does the complexity of the MNM present a problem for regulators, the validity of data decreases with time, so that the well-known principle of the half-life of facts (Samuel Arbesman, 2012) means that what is an accepted truth now is no longer valid in 20 or 30 years time. The challenge is to build a regulatory system which is flexible enough to be able to deal with new targets and requirements in the future, and this can be helped by the development and introduction of Safe by Design (SbD) principles. The credibility of such a regulatory system, underpinned by the implementation of SbD, is essential for industry, who while accepting the need for regulation demand it is done in a cost effective and rapid manner. The NANoREG II project, built around the challenge of coupling SbD to the regulatory process, will demonstrate and establish new principles and ideas based on data from value chain implementation studies to establish SbD as a fundamental pillar in the validation of a novel MNM. It is widely recognized by industries as well as by regulatory agencies that grouping strategies for NM are urgently needed. ECETOC has formed a task force on NM grouping and also within the OECD WPMN a group works on NM categorisation. However, so far no reliable and regulatory accepted grouping concepts could be established".

Forschungsteam innerhalb von HES-SO: Minelli Michaël , Roux Adrien , Mor Flavio , Stoppini Luc

Partenaires académiques: GE Haute école du paysage, d'ingénierie et d'architecture; hepia inSTI; Stoppini Luc, hepia inSTI

Partenaires professionnels: Partenaires NanoReg2

Durée du projet: 10.03.2016 - 28.02.2019

Montant global du projet: 365'098 CHF

Statut: Abgeschlossen

Développement d'un appareil permettant le monitoring en continu de tissus nerveux ainsi que de barrières biologiques : modélisation de l'unité neurovasculaire.
AGP

Rolle: Mitarbeiter

Requérant(e)s: hepia inSTI, Stoppini Luc, hepia inSTI

Financement: HES-SO Rectorat

Description du projet : "As the world's population is aging, diseases of the central nervous system (CNS) become an increasing threat for global health. The total annual cost resulting from CNS diseases is quickly escalating. While considered a public health priority by the World Health Organization, the development of drugs against these diseases fails to succeed. CNS drugs have one of the highest failure rates and longest development times. One reason for this poor success is that CNS drugs have to cross the blood brain barrier (BBB) before reaching the neural tissue. Many promising substances with proven effects in in vitro models fail in human because they cannot cross the BBB or are denatured by the crossing. This complexity is worsened by the fact that there is currently no in vitro system to test simultaneously whether a substance can cross the human BBB and adequately affect the adjacent human neural tissue. The project MEAZURE addresses this problem. We will develop a device allowing the tissue engineering of an artificial human neurovascular unit (NVU), i.e. an in vitro model comprising both the neural tissue and the BBB. This device will allow the simultaneous monitoring of the two components of the model and their pharmacological testing. This innovative solution aims at increasing the success rate of CNS drug development by facilitating and speeding up the drug discovery process and to screen potential neurotoxic molecules present in our environment. MEAZURE is a collaborative effort of 5 groups of the HES-SO. The main deliverable is a device combining a system to record simultaneously neuronal activity with a system to measure the blood-brain barrier permeability. A Micro-Electrode Array (MEA) unit will allow the electrophysiological recording of neural cultures sitting at the bottom of a standard 24-well plate and a Trans Endothelial Electrical Resistance (TEER) unit allowing the recording of the electrical impedance of a cultured BBB positioned just above. Both systems will be developed and assembled using the HES-SO competences and correspond to adaptations and improvements of home-made technologies. We have maximized innovation to deliver a fully operational and efficient product. The device will be a unique stand-alone system able to work autonomously in an incubator, data being transmitted wirelessly or stored locally within the device. The device is also versatile and amenable for MEA recording, TEER recording or both. Finally it has medium-throughput capacities, it is compatible with industrial use and it will be proposed at international level for R&D or commercial use. "

Forschungsteam innerhalb von HES-SO: Pirrami Lorenzo , Rizzotti Aïcha , Walker Anne , Thoma Yann , Wertenbroek Rick , Scherwey Roland , Roux Adrien , Meury Mike , Mor Flavio , Schnyder Bruno , Mazza Marco , Stoppini Luc

Partenaires académiques: ReDS; VS - Institut Technologies du vivant; hepia inSTI; FR - EIA - Institut IPRINT; Technologie d'interaction; Stoppini Luc, hepia inSTI

Durée du projet: 15.12.2015 - 31.12.2017

Montant global du projet: 211'600 CHF

Statut: Abgeschlossen

Swiss Centre Human Applied Toxicology.
AGP

Rolle: Mitarbeiter

Financement: SCAHT; hepia inSTI; hepia inSTI

Description du projet : Human in vitro 2D and 3D models of mature neural networks for neurotoxicity assessment.

Forschungsteam innerhalb von HES-SO: Trinchan Dominique , Nikles Laetitia , Roux Adrien , Stoppini Luc

Durée du projet: 01.01.2016 - 31.12.2016

Montant global du projet: 168'500 CHF

Statut: Abgeschlossen

Swiss Centre Human Applied Toxicology.
AGP

Rolle: Mitarbeiter

Financement: SCAHT; hepia inSTI; hepia inSTI

Description du projet : Human in vitro 2D and 3D models of mature neural networks for neurotoxicity assessment.

Forschungsteam innerhalb von HES-SO: Trinchan Dominique , Nikles Laetitia , Roux Adrien , Stoppini Luc

Durée du projet: 01.01.2015 - 31.12.2015

Montant global du projet: 168'095 CHF

Statut: Abgeschlossen

A Microfluidic in-vitro perfusion-cell for radiooncological pharmaceutical testing
AGP

Rolle: Mitarbeiter

Requérant(e)s: Ingénierie des surfaces, Whitlow Harry, Ingénierie des surfaces

Financement: HES-SO Rectorat

Description du projet : Radiobeam Abstract Problem Current radiopharmaceutical testing for Ion beam cancer therapy (IBCT) requires prohibitively expensive large accelerator systems and animal models. The project will construct a proof of concept test system for brain tumour tissue models using co-cultured fluorescent-marked tumour- and normal cells. The perfusion cell is based on a microfluidic circuit allowing diagnosis with in-situ fluorescence confocal microscopy) of neural cells. This will allow nutrient and pharmaceutical preparations to be introduced during irradiation. Uniqueness Use of multi-cell type brain tissue cultures with low-energy (MeV) ion beam irradiation is an completely new and low-cost way for realistic studies of the neural cellular-level activity representative of the site of tumour eradication deep inside the patients brain. This is inaccessible to both in-vivo studies and single-cell irradiation (where intercellular cell communication il limited)

Forschungsteam innerhalb von HES-SO: Kämpfer Alexandra , Broggini Christiane , Cséfalvay Catherine , Prieur Claudio , Ramseyer Stephan , Roux Adrien , Stoppini Luc

Partenaires académiques: hepia inSTI; Ingénierie des surfaces; Whitlow Harry, Ingénierie des surfaces

Durée du projet: 01.11.2013 - 31.10.2015

Montant global du projet: 250'000 CHF

Statut: Abgeschlossen

In vitro models for toxicity assessment
AGP

Rolle: Mitarbeiter

Financement: UNIGE; hepia inSTI; hepia inSTI

Description du projet : "3 Neurotoxicology in vitro 3.2 Human in vitro 2D and 3D models of mature neural networks for Neurotoxicity assessment Project Leader: Luc Stoppini Partners: F. Tschudi-Monnet; C. Degeyter; Alex Scherl Final histological characterization of 2D and 3 D human neural networks: We have generated human neural cells and tissue derived from hESCs. We will perform the final characterization of the different 2D and 3 D neural cultures. Immunostainings of the different neural makers to assess the presence and the organization of the different cells types (GFAP: for astrocytes; CNPase and MBP for oligodendrocytes; MAP2, NF,NeuN for neurones). We will also perform some electron microscopy studies to assess the precise morphology of the differentiated nervous tissues. Deliverable: Report on the histological characterization 01.01.2013 31.05.2013 Functional Characterization of the neural networks generated from hESCs by electrophysiological studies: Electrophysiological recordings will be performed using neural tissues generated from hESCs and laid down onto MEAs. Spontaneous as well as evoked field potentials will be recorded in control nervous tissues and after exposure of the neuro-glial networks to reference pharmacological molecules to verify that the nervous tissues are responding similarly to primary neural tissues. Deliverable: Report on the 3D neural tissue electrophysiological characterization. 01.01.2013 31.06.2013 Acute neurotoxicity studies: Acute dose-responses of neurotoxicants will be performed in 3D human neural networks to assess their effects on the neuronal activity in vitro by means of electrophysiological M.E.A. recordings. Deliverable: Report on the 3D neural tissue electrophysiological characterization for reference neurotoxic compounds. 01.07.2013 31.12.2013 Gene expression profile in 3D neural tissues: Gene expression profile: We will verify gene expression toxicity signatures using different types of xenobiotics (control and known to induce adverse effects on neural tissues). Human neuro-glial networks will be treated acutely or repeatedly with different concentrations of a series of different types of neurotoxicants. mRNA will be isolated at different culture time points and measured by RT-qPCR. Deliverable: Report on the 3D neural tissue gene profile of specific markers in control and using reference neurotoxic molecules. 01.04.2013 31.12.2013 Proteomic analyses of 3D human neural tissues: The proteomic analysis profile will be performed in control conditions and after treatment of 3 D human neural tissues with reference neurotoxic molecules. Deliverable: Report on proteomic neurotoxic profile of 3D human neural tissues. 01.03.2013 31.12.2013 Functional activities of 2D neural networks using calcium mobilization assay: Measurement of calcium mobilization: Variations in the concentration of intracellular calcium, which is known to trigger a number of events including the release of synaptic transmitter, will be measured using Fluo-4 Flexstation Calcium assay kit. Human neuronal cells will be grown in 96 well plates to fit to the workflow system. Reference toxic molecules will be tested to validate the approach. Deliverable: Report on the validation of the Calcium mobilization as a functional assay to assess neurotoxicity. 01.03.2013 31.12.2013 Functional activities of 2D neural networks using Neurotransmitter Transporter Uptake Assay: Homogeneous Neurotransmitter Transporter Uptake Assay: The assay includes a fluorescent indicator dye that mimics the neurotransmitters serotonin, norepinephrine, and dopamine which are actively transported into the cells via the specific neurotransmitter transporters. The fluorescent substrate that mimics the biogenic amine neurotransmitters is then taken up into the cell through those specific transporters, resulting in increased intracellular fluorescence intensity. This homogeneous, fluorescent assay is robust, sensitive, and specific, and

Forschungsteam innerhalb von HES-SO: Trinchan Dominique , Nikles Laetitia , Roux Adrien , Stoppini Luc

Durée du projet: 01.04.2014 - 31.12.2014

Montant global du projet: 340'000 CHF

Statut: Abgeschlossen

In vitro models for toxicity assessement.
AGP

Rolle: Mitarbeiter

Financement: hepia inSTI; Université de Genève; hepia inSTI

Description du projet : "3 Neurotoxicology in vitro 3.2 Human in vitro 2D and 3D models of mature neural networks for Neurotoxicity assessment Project Leader: Luc Stoppini Partners: F. Tschudi-Monnet; C. Degeyter; Alex Scherl Final histological characterization of 2D and 3 D human neural networks: We have generated human neural cells and tissue derived from hESCs. We will perform the final characterization of the different 2D and 3 D neural cultures. Immunostainings of the different neural makers to assess the presence and the organization of the different cells types (GFAP: for astrocytes; CNPase and MBP for oligodendrocytes; MAP2, NF,NeuN for neurones). We will also perform some electron microscopy studies to assess the precise morphology of the differentiated nervous tissues. Deliverable: Report on the histological characterization 01.01.2013 31.05.2013 Functional Characterization of the neural networks generated from hESCs by electrophysiological studies: Electrophysiological recordings will be performed using neural tissues generated from hESCs and laid down onto MEAs. Spontaneous as well as evoked field potentials will be recorded in control nervous tissues and after exposure of the neuro-glial networks to reference pharmacological molecules to verify that the nervous tissues are responding similarly to primary neural tissues. Deliverable: Report on the 3D neural tissue electrophysiological characterization. 01.01.2013 31.06.2013 Acute neurotoxicity studies: Acute dose-responses of neurotoxicants will be performed in 3D human neural networks to assess their effects on the neuronal activity in vitro by means of electrophysiological M.E.A. recordings. Deliverable: Report on the 3D neural tissue electrophysiological characterization for reference neurotoxic compounds. 01.07.2013 31.12.2013 Gene expression profile in 3D neural tissues: Gene expression profile: We will verify gene expression toxicity signatures using different types of xenobiotics (control and known to induce adverse effects on neural tissues). Human neuro-glial networks will be treated acutely or repeatedly with different concentrations of a series of different types of neurotoxicants. mRNA will be isolated at different culture time points and measured by RT-qPCR. Deliverable: Report on the 3D neural tissue gene profile of specific markers in control and using reference neurotoxic molecules. 01.04.2013 31.12.2013 Proteomic analyses of 3D human neural tissues: The proteomic analysis profile will be performed in control conditions and after treatment of 3 D human neural tissues with reference neurotoxic molecules. Deliverable: Report on proteomic neurotoxic profile of 3D human neural tissues. 01.03.2013 31.12.2013 Functional activities of 2D neural networks using calcium mobilization assay: Measurement of calcium mobilization: Variations in the concentration of intracellular calcium, which is known to trigger a number of events including the release of synaptic transmitter, will be measured using Fluo-4 Flexstation Calcium assay kit. Human neuronal cells will be grown in 96 well plates to fit to the workflow system. Reference toxic molecules will be tested to validate the approach. Deliverable: Report on the validation of the Calcium mobilization as a functional assay to assess neurotoxicity. 01.03.2013 31.12.2013 Functional activities of 2D neural networks using Neurotransmitter Transporter Uptake Assay: Homogeneous Neurotransmitter Transporter Uptake Assay: The assay includes a fluorescent indicator dye that mimics the neurotransmitters serotonin, norepinephrine, and dopamine which are actively transported into the cells via the specific neurotransmitter transporters. The fluorescent substrate that mimics the biogenic amine neurotransmitters is then taken up into the cell through those specific transporters, resulting in increased intracellular fluorescence intensity. This homogeneous, fluorescent assay is robust, sensitive, and specific, an

Forschungsteam innerhalb von HES-SO: Trinchan Dominique , Nikles Laetitia , Roux Adrien , Sthioul Hervé , Stoppini Luc

Durée du projet: 01.01.2013 - 30.06.2014

Montant global du projet: 340'000 CHF

Statut: Abgeschlossen

2024

The e-Flower:
Wissenschaftlicher Artikel ArODES
a hydrogel-actuated 3D MEA for brain spheroid electrophysiology

Eleonora Martinelli, Outman Akouissi, Luca Liebi, Ivan Furfaro, Desirée Maulà, Nathan Savoia, Antoine Remy, Laetitia Nikles, Adrien Roux, Luc Stoppini, Stéphanie P. Lacour

Science Advances,  2024, 10, 42, eadp8054

Link zur Publikation

Zusammenfassung:

Traditional microelectrode arrays (MEAs) are limited to measuring electrophysiological activity in two dimensions, failing to capture the complexity of three-dimensional (3D) tissues such as neural organoids and spheroids. Here, we introduce a flower-shaped MEA (e-Flower) that can envelop submillimeter brain spheroids following actuation by the sole addition of the cell culture medium. Inspired by soft microgrippers, its actuation mechanism leverages the swelling properties of a polyacrylic acid hydrogel grafted to a polyimide substrate hosting the electrical interconnects. Compatible with standard electrophysiology recording systems, the e-Flower does not require additional equipment or solvents and is ready to use with preformed 3D tissues. We designed an e-Flower achieving a curvature as low as 300 micrometers within minutes, a value tunable by the choice of reswelling media and hydrogel cross-linker concentration. Furthermore, we demonstrate the ability of the e-Flower to detect spontaneous neural activity across the spheroid surface, demonstrating its potential for comprehensive neural signal recording.

Versatile micro-electrode array to monitor human iPSC derived 3D neural tissues at air-liquid interface
Wissenschaftlicher Artikel ArODES

Luc Stoppini, Marc Heuschkel, Céline Loussert-Fonta, Loris Gomez Baisac, Adrien Roux

Frontiers in Cellular Neuroscience,  2024, 18

Link zur Publikation

Zusammenfassung:

Engineered 3D neural tissues made of neurons and glial cells derived from human induced pluripotent stem cells (hiPSC) are among the most promising tools in drug discovery and neurotoxicology. They represent a cheaper, faster, and more ethical alternative to in vivo animal testing that will likely close the gap between in vitro animal models and human clinical trials. Micro-Electrode Array (MEA) technology is known to provide an assessment of compound effects on neural 2D cell cultures and acute tissue preparations by real-time, non-invasive, and long-lasting electrophysiological monitoring of spontaneous and evoked neuronal activity. Nevertheless, the use of engineered 3D neural tissues in combination with MEA biochips still involves series of constraints, such as drastically limited diffusion of oxygen and nutrients within tissues mainly due to the lack of vascularization. Therefore, 3D neural tissues are extremely sensitive to experimental conditions and require an adequately designed interface that provides optimal tissue survival conditions. A well-suited technique to overcome this issue is the combination of the Air-Liquid Interface (ALI) tissue culture method with the MEA technology. We have developed a full 3D neural tissue culture process and a data acquisition system composed of high-end electronics and novel MEA biochips based on porous, flexible, thin-film membranes integrating recording electrodes, named as “Strip-MEA,” to allow the maintenance of an ALI around the 3D neural tissues. The main motivation of the porous MEA biochips development was the possibility to monitor and to study the electrical activity of 3D neural tissues under different recording configurations, (i) the Strip-MEA can be placed below a tissue, (ii) or by taking advantage of the ALI, be directly placed on top of the tissue, or finally, (iii) it can be embedded into a larger neural tissue generated by the fusion of two (or more) tissues placed on both sides of the Strip-MEA allowing the recording from its inner part. This paper presents the recording and analyses of spontaneous activity from the three positioning configurations of the Strip-MEAs. Obtained results are discussed with the perspective of developing in vitro models of brain diseases and/or impairment of neural network functioning.

2023

Opening the black box of traumatic brain injury :
Wissenschaftlicher Artikel ArODES
a holistic approach combining human 3D neural tissue and an in vitro traumatic brain injury induction device

Céline Loussert-Fonta, Luc Stoppini, Yoan Neuenschwander, Ophélie Righini, Denis Prim, Cédric Schmidt, Marc O. Heuschkel, Loris Gomez Baisac, Milica Jovic, Marc E. Pfeifer, Jérôme Extermann, Adrien Roux

Frontiers in Neuroscience,  2023, vol. 17, article no. 1189615

Link zur Publikation

Zusammenfassung:

Traumatic brain injury (TBI) is caused by a wide range of physical events and can induce an even larger spectrum of short- to long-term pathophysiologies. Neuroscientists have relied on animal models to understand the relationship between mechanical damages and functional alterations of neural cells. These in vivo and animal-based in vitro models represent important approaches to mimic traumas on whole brains or organized brain structures but are not fully representative of pathologies occurring after traumas on human brain parenchyma. To overcome these limitations and to establish a more accurate and comprehensive model of human TBI, we engineered an in vitro platform to induce injuries via the controlled projection of a small drop of liquid onto a 3D neural tissue engineered from human iPS cells. With this platform, biological mechanisms involved in neural cellular injury are recorded through electrophysiology measurements, quantification of biomarkers released, and two imaging methods [confocal laser scanning microscope (CLSM) and optical projection tomography (OPT)]. The results showed drastic changes in tissue electrophysiological activities and significant releases of glial and neuronal biomarkers. Tissue imaging allowed us to reconstruct the injured area spatially in 3D after staining it with specific nuclear dyes and to determine TBI resulting in cell death. In future experiments, we seek to monitor the effects of TBI-induced injuries over a prolonged time and at a higher temporal resolution to better understand the subtleties of the biomarker release kinetics and the cell recovery phases.

Opening the black box of traumatic brain injury: a holistic approach combining human 3D neural tissue and an in vitro traumatic brain injury induction device
Wissenschaftlicher Artikel

Céline Loussert-Fonta, Stoppini Luc, Yoan Neuenschwander, Ophélie Righini, Prim Denis, Cédric Schmidt, Heuschkel Marc, Loris Gomez Baisac, Jovic Milica, Pfeifer Marc Emil, Extermann Jérôme, Roux Adrien

Frontiers in Neuroscience, 2023 , vol.  17, no  1189615

Link zur Publikation

Opening the black box of traumatic brain injury: a holistic approach combining human 3D neural tissue and an in vitro traumatic brain injury induction device
Wissenschaftlicher Artikel

Céline Loussert-Fonta, Stoppini Luc, Yoan Neuenschwander, Ophélie Righini, Denis Prim, Schmidt Cédric, Heuschkel Marc, Loris Gomez Baisac, Milica Jović, Marc E. Pfeifer, Extermann Jérôme, Roux Adrien

Front. Neurosci., 2023 , vol.  17:1189615

Link zur Publikation

Zusammenfassung:

Traumatic brain injury (TBI) is caused by a wide range of physical events and can induce an even larger spectrum of short- to long-term pathophysiologies. Neuroscientists have relied on animal models to understand the relationship between mechanical damages and functional alterations of neural cells. These in vivo and animal-based in vitro models represent important approaches to mimic traumas on whole brains or organized brain structures but are not fully representative of pathologies occurring after traumas on human brain parenchyma. To overcome these limitations and to establish a more accurate and comprehensive model of human TBI, we engineered an in vitro platform to induce injuries via the controlled projection of a small drop of liquid onto a 3D neural tissue engineered from human iPS cells. With this platform, biological mechanisms involved in neural cellular injury are recorded through electrophysiology measurements, quantification of biomarkers released, and two imaging methods [confocal laser scanning microscope (CLSM) and optical projection tomography (OPT)]. The results showed drastic changes in tissue electrophysiological activities and significant releases of glial and neuronal biomarkers. Tissue imaging allowed us to reconstruct the injured area spatially in 3D after staining it with specific nuclear dyes and to determine TBI resulting in cell death. In future experiments, we seek to monitor the effects of TBI-induced injuries over a prolonged time and at a higher temporal resolution to better understand the subtleties of the biomarker release kinetics and the cell recovery phases.

2022

Statistical distortion of supervised learning predictions in optical microscopy induced by image compression
Wissenschaftlicher Artikel ArODES

Enrico Pomarico, Cédric Schmidt, Florian Chays, David Nguyen, Arielle Planchette, Audrey Tissot, Adrien Roux, Stéphane Pagès, Laura Batti, Christoph Clausen, Theo Lasser, Aleksandra Radenovic, Bruno Sanguinetti, Jérôme Extermann

Scientific Reports,  2022, vol. 12, article no. 3464

Link zur Publikation

Zusammenfassung:

The growth of data throughput in optical microscopy has triggered the extensive use of supervised learning (SL) models on compressed datasets for automated analysis. Investigating the effects of image compression on SL predictions is therefore pivotal to assess their reliability, especially for clinical use. We quantify the statistical distortions induced by compression through the comparison of predictions on compressed data to the raw predictive uncertainty, numerically estimated from the raw noise statistics measured via sensor calibration. Predictions on cell segmentation parameters are altered by up to 15% and more than 10 standard deviations after 16-to-8 bits pixel depth reduction and 10:1 JPEG compression. JPEG formats with higher compression ratios show significantly larger distortions. Interestingly, a recent metrologically accurate algorithm, offering up to 10:1 compression ratio, provides a prediction spread equivalent to that stemming from raw noise. The method described here allows to set a lower bound to the predictive uncertainty of a SL task and can be generalized to determine the statistical distortions originated from a variety of processing pipelines in AI-assisted fields.

The role of interstitial fluid pressure in cerebral porous biomaterial integration
Wissenschaftlicher Artikel ArODES

Fabien Bonini, Sébastien Mosser, Flavio Maurizio Mor, Anissa Boutabla, Patrick Burch, Amélie Béduer, Adrien Roux, Thomas Braschler

Brain Sciences,  2022, vol. 12, no. 4, article 417

Link zur Publikation

Zusammenfassung:

Recent advances in biomaterials offer new possibilities for brain tissue reconstruction. Biocompatibility, provision of cell adhesion motives and mechanical properties are among the present main design criteria. We here propose a radically new and potentially major element determining biointegration of porous biomaterials: the favorable effect of interstitial fluid pressure (IFP). The force applied by the lymphatic system through the interstitial fluid pressure on biomaterial integration has mostly been neglected so far. We hypothesize it has the potential to force 3D biointegration of porous biomaterials. In this study, we develop a capillary hydrostatic device to apply controlled in vitro interstitial fluid pressure and study its effect during 3D tissue culture. We find that the IFP is a key player in porous biomaterial tissue integration, at physiological IFP levels, surpassing the known effect of cell adhesion motives. Spontaneous electrical activity indicates that the culture conditions are not harmful for the cells. Our work identifies interstitial fluid pressure at physiological negative values as a potential main driver for tissue integration into porous biomaterials. We anticipate that controlling the IFP level could narrow the gap between in vivo and in vitro and therefore decrease the need for animal screening in biomaterial design.

2021

SpikeOnChip :
Wissenschaftlicher Artikel ArODES
a custom embedded platform for neuronal activity recording and analysis

Rick Wertenbroek, Yann Thoma, Flavio Maurizio Mor, Sara Grassi, Marc Olivier Heuschkel, Adrien Roux, Luc Stoppini

IEEE Transactions on Biomedical Circuits and Systems,  2021, vol. 15, no, 4, pp. 743 - 755

Link zur Publikation

Zusammenfassung:

In this paper we present SpikeOnChip, a custom embedded platform for neuronal activity recording and online analysis. The SpikeOnChip platform was developed in the context of automated drug testing and toxicology assessments on neural tissue made from human induced pluripotent stem cells. The system was developed with the following goals: to be small, autonomous and low power, to handle micro-electrode arrays with up to 256 electrodes, to reduce the amount of data generated from the recording, to be able to do computation during acquisition, and to be customizable. This led to the choice of a Field Programmable Gate Array System-On-Chip platform. This paper focuses on the embedded system for acquisition and processing with key features being the ability to record electrophysiological signals from multiple electrodes, detect biological activity on all channels online for recording, and do frequency domain spectral energy analysis online on all channels during acquisition. Development methodologies are also presented. The platform is finally illustrated in a concrete experiment with bicuculline being administered to grown human neuronal tissue through microfluidics, resulting in measurable effects in the spike recordings and activity. The presented platform provides a valuable new experimental instrument that can be further extended thanks to the programmable hardware and software.

Blood–Brain Barrier Dynamic Device with Uniform Shear Stress Distribution for Microscopy and Permeability Measurements
Wissenschaftlicher Artikel ArODES

Nina Choublier, Yoann Müller, Loris Gomez Baisac, Jeremy Laedermann, Casimir de Rham, Xavier Declèves, Adrien Roux

Applied Sciences,  2021, vol. 11, article no. 5584

Link zur Publikation

Zusammenfassung:

Neurology has always been one of the therapeutic areas with higher attrition rates. One of the main difficulties is the presence of the blood–brain barrier (BBB) that restricts access to the brain for major drugs. This low success rate has led to an increasing demand for in vitro tools. The shear stress, which positively affects endothelial cell differentiation by mimicking blood flow, is required for a more physiological in vitro BBB model. We created an innovative device specifically designed for cell culture under shear stress to investigate drug permeability. Our dynamic device encompasses two compartments communicating together via a semi-permeable membrane, on which human cerebral microvascular endothelial (hCMEC/D3) cells were seeded. The fluidic controlled environment ensures a laminar and homogenous flow to culture cells for at least seven days. Cell differentiation was characterized by immunodetection of inter-endothelial junctions directly in the device by confocal microscopy. Finally, we performed permeability assay with lucifer yellow in both static and dynamic conditions in parallel. Our dynamic device is suited to the evaluation of barrier function and the study of drug transport across the BBB, but it could also be used with other human cell types to reproduce intestinal or kidney barriers.

Mass generation, neuron labelling and 3D imaging of minibrains
Wissenschaftlicher Artikel ArODES

Subashika Govindan, Laura Batti, Samira F. Osterop, Luc Stoppini, Adrien Roux

Frontiers in Bioengineering and Biotechnology,

Link zur Publikation

Zusammenfassung:

Minibrain is a spherical in vitro 3D brain organoid model, composed of a mixed population of neurons and glial cells, generated from human iPSC derived neural stem cells. Despite the advances in human brain organoid models, there is a lack of labelling and imaging methodologies to characterize these models. In this study, we present a step-by-step methodology to generate human minibrain nurseries and novel strategies to subsequently label projection neurons, perform immunohistochemistry and 3D imaging of the minibrains at large multiplexable scales. To visualize projection neurons, we adapt viral transduction and to visualize the organization of cell types we implement immunohistochemistry. To facilitate 3D imaging of minibrains, we present here pipelines and accessories for one step mounting and clearing suitable for confocal microscopy. The pipelines are specifically designed in such a way that the assays can be multiplexed with ease for large-scale screenings using minibrains. Using the pipeline, we present i. dendrite morphometric properties obtained from 3D neuron morphology reconstructions and ii. distribution and quantification of cell types in 3D across whole mount organoids.

SpikeOnChip : A Custom Embedded Platform for Neuronal Activity Recording and Analysis
Wissenschaftlicher Artikel

Rick Wertenbroek, Yann Thoma, Flavio Maurizio Mor, Sara Grassi, Heuschkel Marc, Roux Adrien, Stoppini Luc

IEEE TRANSACTIONS ON BIOMEDICAL CIRCUITS AND SYSTEMS, 2021 , vol.  15, no  4, pp.  743-755

Link zur Publikation

Zusammenfassung:

In this paper we present SpikeOnChip, a custom embedded platform for neuronal activity recording and online analysis. The SpikeOnChip platform was developed in the context of automated drug testing and toxicology assessments on neural tissue made from human induced pluripotent stem cells. The system was developedwith the following goals: to be small, autonomous and low power, to handle micro-electrode arrays with up to 256 electrodes, to reduce the amount of data generated from the recording, to be able to do computation during acquisition, and to be customizable. This led to the choice of a Field Programmable Gate Array System-On-Chip platform. This paper focuses on the embedded system for acquisition and processing with key features being the ability to record electrophysiological signals from multiple electrodes, detect biological activity on all channels online for recording, and do frequency domain spectral energy analysis online on all channels during acquisition.Development methodologies are also presented. The platform is finally illustrated in a concrete experiment with bicuculline being administered to grown human neural tissue through microfluidics, resulting in measurable effects in the spike recordings and activity. The presented platformprovides a valuable new experimental instrument that can be further extended thanks to the programmable hardware and software.

2020

Soft printable electrode coating for neural interfaces
Wissenschaftlicher Artikel ArODES

Michael Shur, Florian Flageller, Elvira Pirondini, Adrien Roux, Arnaud Bichat, Grégoire Courtine, Stéphanie P. Lacour

ACS Applied Bio Materials,  2020

Link zur Publikation

Zusammenfassung:

The mechanical mismatch between implantable interfaces and neural tissues may be reduced by employing soft polymeric materials. Here, we report on a simple strategy to prepare and pattern a soft electrode coating of neural interfacing devices based on a screen-printable conducting hydrogel. The coating formulation, based on polyacrylamide and poly(3,4-ethylenedioxythiophene) polystyrene sulfonate, is suitable to additive manufacturing and exhibits excellent adhesion to polydimethylsiloxane, an elastomer commonly used as a substrate in soft neural interfaces. The soft conductive coating displays a tunable elastic modulus in the 10–100 kPa range and electrochemical properties on a par with stiff conductive inks while supporting good neural cell attachment and proliferation in vitro. Next, the soft printable hydrogel is integrated within a 4 × 4 microelectrode array for electrocorticography with 250 μm-diameter contacts. Acute recording of cortical local field potentials and electrochemical characterization preimplantation and postimplantation highlight the stability of the soft organic conductor. The overall robustness of the soft coating and its patterning method provide a promising route for a range of implantable bioelectronic applications.

Mass Generation, Neuron Labelling and 3D Imaging of Minibrains
Wissenschaftlicher Artikel

Subashika Govindan, Laura Batti, Samira F Osterop, Stoppini Luc, Roux Adrien

biorxiv, 2020

Link zur Publikation

Zusammenfassung:

Minibrain is a spherical in vitro 3D brain organoid model, composed of a mixed population of neurons and glial cells, generated from human iPSC derived neural stem cells. Despite the advances in human brain organoid models, there is a lack of labelling and imaging methodologies to characterize these models. In this study, we present a step-by-step methodology to generate human minibrain nurseries and novel strategies to subsequently label projection neurons, perform immunohistochemistry and 3D imaging of the minibrains at large multiplexable scales. To visualize projection neurons, we adapt viral transduction and to visualize the organization of cell types we implement immunohistochemistry. To facilitate 3D imaging of minibrains, we present here pipelines and accessories for one step mounting and clearing suitable for confocal microscopy. The pipelines are specifically designed in such a way that the assays can be multiplexed with ease for large-scale screenings using minibrains. Using the pipeline, we present i. dendrite morphometric properties obtained from 3D neuron morphology reconstructions and ii. distribution and quantification of cell types in 3D across whole mount organoids.

Soft Printable Electrode Coating for Neural Interfaces
Wissenschaftlicher Artikel

Florian Fallegger, Michael Shur, Elvira Pirondini, Roux Adrien, Arnaud Bichat, Quentin Barraud, Grégoire Courtine, Stéphanie P. Lacour

ACS Appl. Bio Mater., 2020 , vol.  3, no  7, pp.  4388-4397

Link zur Publikation

Zusammenfassung:

The mechanical mismatch between implantable interfaces and neural tissues may be reduced by employing soft polymeric materials. Here, we report on a simple strategy to prepare and pattern a soft electrode coating of neural interfacing devices based on a screen-printable conducting hydrogel. The coating formulation, based on polyacrylamide and poly(3,4-ethylenedioxythiophene) polystyrene sulfonate, is suitable to additive manufacturing and exhibits excellent adhesion to polydimethylsiloxane, an elastomer commonly used as a substrate in soft neural interfaces. The soft conductive coating displays a tunable elastic modulus in the 10–100 kPa range and electrochemical properties on a par with stiff conductive inks while supporting good neural cell attachment and proliferation in vitro. Next, the soft printable hydrogel is integrated within a 4 × 4 microelectrode array for electrocorticography with 250 μm-diameter contacts. Acute recording of cortical local field potentials and electrochemical characterization preimplantation and postimplantation highlight the stability of the soft organic conductor. The overall robustness of the soft coating and its patterning method provide a promising route for a range of implantable bioelectronic applications.

Soft Printable Electrode Coating for Neural Interfaces
Wissenschaftlicher Artikel

Michael Shur, Florian Fallegger, Roux Adrien, Elvira Pirondini, Arnaud Bichat, Quentin Barraud, Grégoire Courtine, Stéphanie P. Lacour

ACS Applied Bio Materials, 2020

Link zur Publikation

Zusammenfassung:

The mechanical mismatch between implantable interfaces and neural tissues may be reduced by employing soft polymeric materials. Here, we report on a simple strategy to prepare and pattern a soft electrode coating of neural interfacing devices based on a screen-printable conducting hydrogel. The coating formulation, based on polyacrylamide and poly(3,4-ethylenedioxythiophene) polystyrene sulfonate, is suitable to additive manufacturing and exhibits excellent adhesion to polydimethylsiloxane, an elastomer commonly used as a substrate in soft neural interfaces. The soft conductive coating displays a tunable elastic modulus in the 10–100 kPa range and electrochemical properties on a par with stiff conductive inks while supporting good neural cell attachment and proliferation in vitro. Next, the soft printable hydrogel is integrated within a 4 × 4 microelectrode array for electrocorticography with 250 μm-diameter contacts. Acute recording of cortical local field potentials and electrochemical characterization preimplantation and postimplantation highlight the stability of the soft organic conductor. The overall robustness of the soft coating and its patterning method provide a promising route for a range of implantable bioelectronic applications.

2017

Unravelling the effects of multiple experimental factors in metabolomics, analysis of human neural cells with hydrophilic interaction liquid chromatography hyphenated to high resolution mass spectrometry
Wissenschaftlicher Artikel ArODES

Victor Gonzalez-Ruiz, Julian Pezzatti, Adrien Roux, Luc Stoppini, Julien Boccard, Serge Rudaz

Journal of Chromatography,  2017, vol. 1527, pp. 53-60

Link zur Publikation

Zusammenfassung:

This work introduces a strategy for decomposing variable contributions within the data obtained from structured metabolomic studies. This approach was applied in the context of an in vitro human neural model to investigate biochemical changes related to neuroinflammation. Neural cells were exposed to the neuroinflammatory toxicant trimethyltin at different doses and exposure times. In the frame of an untargeted approach, cell contents were analysed using HILIC hyphenated with HRMS. Detected features were annotated at level 1 by comparison against a library of standards, and the 126 identified metabolites were analysed using a recently proposed chemometric tool dedicated to multifactorial Omics datasets, namely, ANOVA multiblock OPLS (AMOPLS). First, the total observed variability was decomposed to highlight the contribution of each effect related to the experimental factors. Both the dose of trimethyltin and the exposure time were found to have a statistically significant impact on the observed metabolic alterations. Cells that were exposed for a longer time exhibited a more mature and differentiated metabolome, whereas the dose of trimethyltin was linked to altered lipid pathways, which are known to participate in neurodegeneration. Then, these specific metabolic patterns were further characterised by analysing the individual variable contributions to each effect. AMOPLS was highlighted as a useful tool for analysing complex metabolomic data. The proposed strategy allowed the separation, quantitation and characterisation of the specific contribution of the different factors and the relative importance of every metabolite to each effect with respect to the total observed variability of the system.

Post-focus expansion of ion beams for low fluence and large area MeV ion irradiation :
Wissenschaftlicher Artikel ArODES
application to human brain tissue and electronics devices

Harry J. Whitlow, Edouard Guibert, Patrick Jeanneret, Alexandra Homsy, Joy Roth, Sven Krause, Adrien Roux, Emmanuel Eggermann, Luc Stoppini

Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms,  2017, vol. 404, pp. 87-91

Link zur Publikation

Zusammenfassung:

Irradiation with ∼3 MeV proton fluences of 106–109 protons cm−2 have been applied to study the effects on human brain tissue corresponding to single-cell irradiation doses and doses received by electronic components in low-Earth orbit. The low fluence irradiations were carried out using a proton microbeam with the post-focus expansion of the beam; a method developed by the group of Breese [1]. It was found from electrophysiological measurements that the mean neuronal frequency of human brain tissue decreased to zero as the dose increased to 0–1050 Gy. Enhancement-mode MOSFET transistors exhibited a 10% reduction in threshold voltage for 2.7 MeV proton doses of 10 Gy while a NPN bipolar transistor required ∼800 Gy to reduce the hfe by 10%, which is consistent the expected values.

Development and characterization of a human embryonic stem cell-derived 3D neural tissue model for neurotoxicity testing.
Wissenschaftlicher Artikel

Roux Adrien, Stoppini Luc

Toxicol In Vitro, 2017 , vol.  38, pp.  124-135

Link zur Publikation

Unravelling the effects of multiple experimental factors in metabolomics, analysis of human neural cells with hydrophilic interaction liquid chromatography hyphenated to high resolution mass spectrometry
Wissenschaftlicher Artikel

Victor Gonzalez-Ruiz, Julien Pezzatti, Roux Adrien, Stoppini Luc, Julien Boccard, Serge Rudaz

J Chromatogr A, 2017 , vol.  1527, pp.  53-60

Link zur Publikation

Zusammenfassung:

This work introduces a strategy for decomposing variable contributions within the data obtained from structured metabolomic studies. This approach was applied in the context of an in vitro human neural model to investigate biochemical changes related to neuroinflammation. Neural cells were exposed to the neuroinflammatory toxicant trimethyltin at different doses and exposure times. In the frame of an untargeted approach, cell contents were analysed using HILIC hyphenated with HRMS. Detected features were annotated at level 1 by comparison against a library of standards, and the 126 identified metabolites were analysed using a recently proposed chemometric tool dedicated to multifactorial Omics datasets, namely, ANOVA multiblock OPLS (AMOPLS). First, the total observed variability was decomposed to highlight the contribution of each effect related to the experimental factors. Both the dose of trimethyltin and the exposure time were found to have a statistically significant impact on the observed metabolic alterations. Cells that were exposed for a longer time exhibited a more mature and differentiated metabolome, whereas the dose of trimethyltin was linked to altered lipid pathways, which are known to participate in neurodegeneration. Then, these specific metabolic patterns were further characterised by analysing the individual variable contributions to each effect. AMOPLS was highlighted as a useful tool for analysing complex metabolomic data. The proposed strategy allowed the separation, quantitation and characterisation of the specific contribution of the different factors and the relative importance of every metabolite to each effect with respect to the total observed variability of the system.

2015

A gas ionisation Direct-STIM detector for MeV ion microscopy
Wissenschaftlicher Artikel ArODES

Rattanaporn Norarat, Edouard Guibert, Patrick Jeanneret, Mario Dellea, Josef Jenni, Adrien Roux, Luc Stoppini, Harry J. Whitlow

Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms,  2015, vol. 348, pp. 58-61

Link zur Publikation

Zusammenfassung:

Direct-Scanning Transmission Ion Microscopy (Direct-STIM) is a powerful technique that yields structural information in sub-cellular whole cell imaging. Usually, a Si p-i-n diode is used in Direct-STIM measurements as a detector. In order to overcome the detrimental effects of radiation damage which appears as a broadening in the energy resolution, we have developed a gas ionisation detector for use with a focused ion beam. The design is based on the ETH Frisch grid-less off-axis Geiger–Müller geometry. It is developed for use in a MeV ion microscope with a standard Oxford Microbeams triplet lens and scanning system. The design has a large available solid angle for other detectors (e.g. proton induced fluorescence). Here we report the performance for imaging ReNcells VM with μm resolution where energy resolutions of <24 keV fwhm could be achieved for 1 MeV protons using isobutane gas.

A gas ionisation Direct-STIM detector for MeV ion microscopy
Wissenschaftlicher Artikel

Rattanaporn Norarat, Edouard Guibert, Patrick Jeanneret, Mario Dellea, Josef Jenni, Roux Adrien, Stoppini Luc, Harry J. Whitlow

Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 2015 , vol.  348, pp.  58-61

Link zur Publikation

Zusammenfassung:

Direct-Scanning Transmission Ion Microscopy (Direct-STIM) is a powerful technique that yields structural information in sub-cellular whole cell imaging. Usually, a Si p-i-n diode is used in Direct-STIM measurements as a detector. In order to overcome the detrimental effects of radiation damage which appears as a broadening in the energy resolution, we have developed a gas ionisation detector for use with a focused ion beam. The design is based on the ETH Frisch grid-less off-axis Geiger–Müller geometry. It is developed for use in a MeV ion microscope with a standard Oxford Microbeams triplet lens and scanning system. The design has a large available solid angle for other detectors (e.g. proton induced fluorescence). Here we report the performance for imaging ReNcells VM with μm resolution where energy resolutions of <24 keV fwhm could be achieved for 1 MeV protons using isobutane gas.

2024

Towards mimicking brain mechanical loads:
Konferenz ArODES
stretchable microelectrode arrays for brain spheroid electrophysiology

Eleonora Martinelli, Ivan Furfaro, Laurine Kolly, Tala El Kaissi, Julian Thomas Bar, Camille Lucette Gabrielle Delgrange, Sina Justine Rollin, Loris Gomez Baisac, Luc Stoppini, Adrien Roux, Stpéhanie Lacour

Proceedings of Biotechnologic Interfaces : Materials, Devices and Applications (CyBioEl), 22-25 October 2024, Limassol, Cyprus

Link zur Konferenz

2022

Point-of-care device for assessing male fertility in animals through measurement of sperm concentration and motility
Konferenz ArODES

Elena Najdenovska, Fabien Dutoit, Loris Gomez Baisac, Yulia Karlova, Alexandre Karlov, Adrien Roux, Olivier Cuisenaire, Laura Elena Raileanu

Reproduction in Domestic Animals ; Proceedings of the 25th Annual Conference of the European Society for Domestic Animal Reproduction (ESDAR)

Link zur Konferenz

Point-of-Care Sperm Concentration and Motility Measurements Using a Portable Acquisition and Processing Device
Konferenz

Cuisenaire Olivier, Najdenovska Elena, Dutoit Fabien, Medwed Gregory, Gomez Baisac Loris, Yulia Karlova, Alexandre Karlov, Roux Adrien, Raileanu Laura Elena

44th International Engineering in Medicine and Biology Conference - IEEE Engineering in Medicine and Biology Society, 11.07.2022 - 15.07.2022, Glasgow, UK

Link zur Konferenz

2021

Portable tool for analyzing male fertility based on the measurement of sperm concentration and motility
Konferenz ArODES

Loris Gomez Baisac, Laetitia Nikles, Elena Najdenovska, Fabien Dutoit, Yulia Karlova, Alexandre Karlov, Olivier Cuisenaire, Laura Elena Raileanu, Adrien Roux

Proceedings of the Swiss Symposium Point-of-Care Diagnostics 2021

Link zur Konferenz

Low-cost toxicogenomic profiling of human iPSC derived minibrain reveals key adverse outcome pathways
Konferenz ArODES

Subashika Govindan, Luc Stoppini, Adrien Roux

Toxicology Letters ; EUROTOX virtual congress, 27 September - 1 October 2021

Link zur Konferenz

Quantifying the effect of image compression on upervised learning tasks in microscopy
Konferenz ArODES

Enrico Pomarico, Cédric Schmidt, D. Nguyen, A. Planchette, Adrien Roux, S. Pagès, L. Batti, C. Clausen, T, Lasser, A. Radenovic, B. Sanguinetti, Jérôme Extermann

Proceedings of Focus on Microscopy 2021, Online Conference, 28-31 March 2021

Link zur Konferenz

2020

Portable tool for analyzing male fertility based on the measurement of sperm concentration and motility
Konferenz ArODES

Tatiana Nogueira, Loris Gomez Baisac, Elena Najdenovska, Fabien Dutoit, Yulia Karlova, Alexandre Karlov, Olivier Cuisenaire, Laura Elena Raileanu, Adrien Roux

Swiss Symposium in Point-of-Care Diagnostics, 29 october 2020, Visp, Switzerland

Link zur Konferenz

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