Publications associées à Fixation (histology)

Graph Representation Learning in Computational Pathology

Advances in scanning systems have enabled the digitization of pathology slides into Whole-Slide Images (WSIs), opening up opportunities to develop Computational Pathology (CompPath) methods for computer-aided cancer diagnosis and prognosis. CompPath has be ...

EPFL2022

Deep Learning Enables Individual Xenograft Cell Classification in Histological Images by Analysis of Contextual Features

Michaël Unser, Cathrin Brisken, Daniel Sage, Olivier Burri, Quentin Juppet, Fabio De Martino, Martin Weigert

Patient-Derived Xenografts (PDXs) are the preclinical models which best recapitulate inter- and intra-patient complexity of human breast malignancies, and are also emerging as useful tools to study the normal breast epithelium. However, data analysis gener ...

2021

Adaptation and Optimization of an Intraneural Electrode to Interface with the Cervical Vagus Nerve

Silvestro Micera, Ivo Strauss

The modulation of the cervical vagus nerve (VN) using neural electrodes has shown great potential to treat cardiovascular, inflammatory, intestinal, or respiratory dysfunctions. Intraneural electrodes have shown great potentials for other neuroprosthetic a ...

IEEE2021

HISTOBREAST, a collection of brightfield microscopy images of Haematoxylin and Eosin stained breast tissue

Tiberiu Totu

Modern histopathology workflows rely on the digitization of histology slides. The quality of the resulting digital representations, in the form of histology slide image mosaics, depends on various specific acquisition conditions and on the image processing ...

2020

Imaging cellular ultrastructures using expansion microscopy (U-ExM)

Michaël Unser, Paul Guichard, Davide Gambarotto, Virginie Hamel, Denis Fortun

Determining the structure and composition of macromolecular assemblies is a major challenge in biology. Here we describe ultrastructure expansion microscopy (U-ExM), an extension of expansion microscopy that allows the visualization of preserved ultrastruc ...

2019

Transmission Microsphere-Assisted Dark-Field Microscopy

Giorgio Quaranta, Stéphane Perrin, Hongyu Li

Microsphere-assisted microscopy allows the limit of the diffraction of light to overcome while being non-invasive, full-field, label-free, and easy-to-implement. However, the observation of translucent samples remains difficult using a classical bright-fie ...

WILEY-V C H VERLAG GMBH2019

Black Lipid Membranes: Challenges in Simultaneous Quantitative Characterization by Electrophysiology and Fluorescence Microscopy

Esther Amstad, Stefan Matile, Maria Tsemperouli

Horizontal black lipid membranes (BLMs) enable optical microscopy to be combined with the electrophysiological measurements for studying ion channels, peptide pores, and ionophores. However, a careful literature review reveals that simultaneous fluorescenc ...

AMER CHEMICAL SOC2019

Tomographic imaging with harmonic holography in tissues of known refractive index distribution

Demetri Psaltis, Ye Pu

High-resolution imaging in thick biological tissues beyond a few transport mean free path of photons remains a formidable challenge to modern science and technology. Recent advancements in optical tomography have enabled the reconstruction of the three-dim ...

SPIE-INT SOC OPTICAL ENGINEERING2018

Block Face Scanning Electron Microscopy of Fluorescently Labeled Axons Without Using Near Infra-Red Branding

Graham Knott, Catherine Maclachlan

In this article, we describe the method that allows fluorescently tagged structures such as axons to be targeted for electron microscopy (EM) analysis without the need to convert their labels into electron dense stains, introduce any fiducial marks, or ima ...

2018

Microfluidic network device

Martinus Gijs, Ata Tuna Ciftlik, Diego Gabriel Dupouy, Pierre Joris

Microfluidic network device (2) configured to supply reagents to a biological tissue sampling device (1), comprising a plurality of microfluidic inlet channels (12) connected to respective sources of said reagents, at least one common outlet channel (22), ...

2017

DNA barcoding of formalin‑fixed aquatic oligochaetes for biomonitoring

Régis Lionel Vivien

Background: Oligochaetes are valuable bioindicators of the quality of watercourse and lake sediments. The morphological identification of aquatic oligochaetes is difficult, prompting the development of new molecular oligochaete indices based on DNA barcodi ...

2016

Ultrastructural analysis of adult mouse neocortex comparing aldehyde perfusion with cryo fixation

Carl Petersen, Graham Knott, Natalya Korogod

Analysis of brain ultrastructure using electron microscopy typically relies on chemical fixation. However, this is known to cause significant tissue distortion including a reduction in the extracellular space. Cryo fixation is thought to give a truer repre ...

Elife Sciences Publications Ltd2015

Optical properties of rabbit brain in the red and near-infrared: changes observed under in vivo, postmortem, frozen, and formalin-fixated conditions

Georges Wagnières, Matthieu Philippe Emmanuel Zellweger, Blaise Lovisa, Andreas Pitzschke

The outcome of light-based therapeutic approaches depends on light propagation in biological tissues, which is governed by their optical properties. The objective of this study was to quantify optical properties of brain tissue in vivo and postmortem and a ...

SPIE Society of Photo-optical Instrumentation Engineers2015

Electrochemical sensing and imaging of biological samples

Alexandra Bondarenko

Implementation of analytical methods for biological samples (e.g. bacteria or mammalian cells) is of great importance for diagnosis and treatment of various diseases, as well as for environmental monitoring. However, analysing biological samples is a cumbe ...

EPFL2015

The In-Vivo Use of Superparamagnetic Iron Oxide Nanoparticles to Detect Inflammation Elicits a Cytokine Response but Does Not Aggravate Experimental Arthritis

Heinrich Hofmann, Lionel André Maurizi

Background Superparamagnetic Iron Oxide Nanoparticles (SPION) are used in diagnostic imaging of a variety of different diseases. For such in-vivo application, an additional coating with a polymer, for example polyvinyl alcohol (PVA), is needed to stabilize ...

Public Library of Science2015

Semiautomated correlative 3D electron microscopy of in vivo-imaged axons and dendrites

Marco Cantoni, Graham Knott, Bohumil Maco

This protocol describes how in vivo-imaged dendrites and axons in adult mouse brains can subsequently be prepared and imaged with focused ion beam scanning electron microscopy (FIBSESEM). The procedure starts after in vivo imaging with chemical fixation, f ...

Nature Publishing Group2014

Direct mapping of 19F in 19FDG-6P in brain tissue at subcellular resolution using soft X-ray fluorescence

Rolf Gruetter, Carole Poitry-Yamate

Low energy x-ray fluorescence (LEXRF) detection was optimized for imaging cerebral glucose metabolism by mapping the fluorine LEXRF signal of 19 F in 19 FDG, trapped as intracellular 19 F-deoxyglucose-6-phosphate ( 19 FDG-6P) at 1μm spatial resolution from ...

2013

PDMS Microchannel Regenerative Peripheral Nerve Interface

Stéphanie Lacour, Katherine Marie Musick

We have fabricated a soft silicone structure to support the regeneration of a sciatic nerve. The device consists of 70 parallel (120 x 110 mu m(2)) channels through which axons extend and then reconnect to the muscles on the other side of the device. Throu ...

Ieee2013

Demonstration of cortical recording using novel flexible polymer neural probes

Philippe Renaud, Arnaud Bertsch, André Mercanzini, Philippe Colin, Marc Jasper Boers, Jean-Charles Bensadoun, Karen Cheung

We present the fabrication, characterization, use in cortical recording and histological results of a flexible implantable neural probe. The microfabricated device is implemented in polyimide and platinum providing mechanical flexibility, high quality elec ...

2008

Comparison of ALA- and ALA hexyl-ester-induced PpIX depth distribution in human skin carcinoma

Hubert van den Bergh, Georges Wagnières, Matthieu Philippe Emmanuel Zellweger, Tanja Gabrecht

Photodynamic therapy (PDT) based on the use of photoactivable porphyrins, such as protoporphyrin IX (PpIX), induced by the topical application of amino-levulinic acid (ALA) or its derivatives, ALA methyl-ester (m-ALA), is a treatment for superficial basal ...

Elsevier2008