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Marquezin CA, Lamy MT, de Souza ES. Molecular collisions or resonance energy transfer in lipid vesicles? A methodology to tackle this question. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.117405] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Collini M, Radaelli F, Sironi L, Ceffa NG, D’Alfonso L, Bouzin M, Chirico G. Adaptive optics microspectrometer for cross-correlation measurement of microfluidic flows. JOURNAL OF BIOMEDICAL OPTICS 2019; 24:1-15. [PMID: 30816029 PMCID: PMC6987636 DOI: 10.1117/1.jbo.24.2.025004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2018] [Accepted: 12/04/2018] [Indexed: 05/17/2023]
Abstract
Mapping flows in vivo is essential for the investigation of cardiovascular pathologies in animal models. The limitation of optical-based methods, such as space-time cross correlation, is the scattering of light by the connective and fat components and the direct wave front distortion by large inhomogeneities in the tissue. Nonlinear excitation of the sample fluorescence helps us by reducing light scattering in excitation. However, there is still a limitation on the signal-background due to the wave front distortion. We develop a diffractive optical microscope based on a single spatial light modulator (SLM) with no movable parts. We combine the correction of wave front distortions to the cross-correlation analysis of the flow dynamics. We use the SLM to shine arbitrary patterns of spots on the sample, to correct their optical aberrations, to shift the aberration corrected spot array on the sample for the collection of fluorescence images, and to measure flow velocities from the cross-correlation functions computed between couples of spots. The setup and the algorithms are tested on various microfluidic devices. By applying the adaptive optics correction algorithm, it is possible to increase up to 5 times the signal-to-background ratio and to reduce approximately of the same ratio the uncertainty of the flow speed measurement. By working on grids of spots, we can correct different aberrations in different portions of the field of view, a feature that allows for anisoplanatic aberrations correction. Finally, being more efficient in the excitation, we increase the accuracy of the speed measurement by employing a larger number of spots in the grid despite the fact that the two-photon excitation efficiency scales as the fourth power of this number: we achieve a twofold decrease of the uncertainty and a threefold increase of the accuracy in the evaluation of the flow speed.
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Affiliation(s)
- Maddalena Collini
- University of Milano-Bicocca, Department of Physics, Milan, Italy
- University of Milano-Bicocca, Nanomedicine Center, Milan, Italy
- Institute of Applied Sciences and Intelligent Systems, National Research Council of Italy, Pozzuoli, Italy
| | | | - Laura Sironi
- University of Milano-Bicocca, Department of Physics, Milan, Italy
| | - Nicolo G. Ceffa
- University of Milano-Bicocca, Department of Physics, Milan, Italy
| | - Laura D’Alfonso
- University of Milano-Bicocca, Department of Physics, Milan, Italy
| | - Margaux Bouzin
- University of Milano-Bicocca, Department of Physics, Milan, Italy
| | - Giuseppe Chirico
- University of Milano-Bicocca, Department of Physics, Milan, Italy
- University of Milano-Bicocca, Nanomedicine Center, Milan, Italy
- Institute of Applied Sciences and Intelligent Systems, National Research Council of Italy, Pozzuoli, Italy
- Address all correspondence to Giuseppe Chirico, E-mail:
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Paiè P, Martínez Vázquez R, Osellame R, Bragheri F, Bassi A. Microfluidic Based Optical Microscopes on Chip. Cytometry A 2018; 93:987-996. [PMID: 30211977 PMCID: PMC6220811 DOI: 10.1002/cyto.a.23589] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2018] [Revised: 07/23/2018] [Accepted: 07/25/2018] [Indexed: 12/21/2022]
Abstract
Last decade's advancements in optofluidics allowed obtaining an ever increasing integration of different functionalities in lab on chip devices to culture, analyze, and manipulate single cells and entire biological specimens. Despite the importance of optical imaging for biological sample monitoring in microfluidics, imaging is traditionally achieved by placing microfluidics channels in standard bench-top optical microscopes. Recently, the development of either integrated optical elements or lensless imaging methods allowed optical imaging techniques to be implemented in lab on chip systems, thus increasing their automation, compactness, and portability. In this review, we discuss known solutions to implement microscopes on chip that exploit different optical methods such as bright-field, phase contrast, holographic, and fluorescence microscopy.
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Affiliation(s)
- Petra Paiè
- Istituto di Fotonica e NanotecnologieConsiglio Nazionale dell RicerchePiazza Leonardo da Vinci 3220133 MilanItaly
| | - Rebeca Martínez Vázquez
- Istituto di Fotonica e NanotecnologieConsiglio Nazionale dell RicerchePiazza Leonardo da Vinci 3220133 MilanItaly
| | - Roberto Osellame
- Istituto di Fotonica e NanotecnologieConsiglio Nazionale dell RicerchePiazza Leonardo da Vinci 3220133 MilanItaly
- Dipartimento di FisicaPolitecnico di MilanoPiazza Leonardo da Vinci 3220133 MilanItaly
| | - Francesca Bragheri
- Istituto di Fotonica e NanotecnologieConsiglio Nazionale dell RicerchePiazza Leonardo da Vinci 3220133 MilanItaly
| | - Andrea Bassi
- Istituto di Fotonica e NanotecnologieConsiglio Nazionale dell RicerchePiazza Leonardo da Vinci 3220133 MilanItaly
- Dipartimento di FisicaPolitecnico di MilanoPiazza Leonardo da Vinci 3220133 MilanItaly
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Ceffa NG, Bouzin M, D'Alfonso L, Sironi L, Marquezin CA, Auricchio F, Marconi S, Chirico G, Collini M. Spatiotemporal Image Correlation Analysis for 3D Flow Field Mapping in Microfluidic Devices. Anal Chem 2018; 90:2277-2284. [PMID: 29266924 DOI: 10.1021/acs.analchem.7b04641] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Microfluidic devices reproducing 3D networks are particularly valuable for nanomedicine applications such as tissue engineering and active cell sorting. There is however a gap in the possibility to measure how the flow evolves in such 3D structures. We show here that it is possible to map 3D flows in complex microchannel networks by combining wide field illumination to image correlation approaches. For this purpose, we have derived the spatiotemporal image correlation analysis of time stacks of single-plane illumination microscopy images. From the detailed analytical and numerical analysis of the resulting model, we developed a fitting method that allows us to measure, besides the in-plane velocity, the out-of-plane velocity component down to vz ≅ 65 μm/s. We have applied this method successfully to the 3D reconstruction of flows in microchannel networks with planar and 3D ramifications. These different network architectures have been realized by exploiting the great prototyping ability of a 3D printer, whose precision can reach few tens of micrometers, coupled to poly dimethyl-siloxane soft-printing lithography.
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Affiliation(s)
- Nicolo' G Ceffa
- Dipartimento di Fisica, Centro di Nanomedicina, Università degli Studi di Milano-Bicocca , Piazza della Scienza 3, 20126, Milano, Italy
| | - Margaux Bouzin
- Dipartimento di Fisica, Centro di Nanomedicina, Università degli Studi di Milano-Bicocca , Piazza della Scienza 3, 20126, Milano, Italy
| | - Laura D'Alfonso
- Dipartimento di Fisica, Centro di Nanomedicina, Università degli Studi di Milano-Bicocca , Piazza della Scienza 3, 20126, Milano, Italy
| | - Laura Sironi
- Dipartimento di Fisica, Centro di Nanomedicina, Università degli Studi di Milano-Bicocca , Piazza della Scienza 3, 20126, Milano, Italy
| | - Cassia A Marquezin
- Instituto de Física, Universidade Federal de Goiás , Goiânia, Goiás 74.690-900, Brazil
| | - Ferdinando Auricchio
- Dipartimento di Ingegneria Civile e Architettura, Università degli Studi di Pavia , 27100 Pavia, Italy
| | - Stefania Marconi
- Dipartimento di Ingegneria Civile e Architettura, Università degli Studi di Pavia , 27100 Pavia, Italy
| | - Giuseppe Chirico
- Dipartimento di Fisica, Centro di Nanomedicina, Università degli Studi di Milano-Bicocca , Piazza della Scienza 3, 20126, Milano, Italy.,CNR-ISASI, Institute of Applied Sciences and Intelligent Systems , Via Campi Flegrei 34, 80078 Pozzuoli, Italy
| | - Maddalena Collini
- Dipartimento di Fisica, Centro di Nanomedicina, Università degli Studi di Milano-Bicocca , Piazza della Scienza 3, 20126, Milano, Italy.,CNR-ISASI, Institute of Applied Sciences and Intelligent Systems , Via Campi Flegrei 34, 80078 Pozzuoli, Italy
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Ceffa NG, Cesana I, Collini M, D'Alfonso L, Carra S, Cotelli F, Sironi L, Chirico G. Spatiotemporal image correlation analysis of blood flow in branched vessel networks of zebrafish embryos. JOURNAL OF BIOMEDICAL OPTICS 2017; 22:1-7. [PMID: 29030941 DOI: 10.1117/1.jbo.22.10.106008] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2017] [Accepted: 09/26/2017] [Indexed: 05/28/2023]
Abstract
Ramification of blood circulation is relevant in a number of physiological and pathological conditions. The oxygen exchange occurs largely in the capillary bed, and the cancer progression is closely linked to the angiogenesis around the tumor mass. Optical microscopy has made impressive improvements in in vivo imaging and dynamic studies based on correlation analysis of time stacks of images. Here, we develop and test advanced methods that allow mapping the flow fields in branched vessel networks at the resolution of 10 to 20 μm. The methods, based on the application of spatiotemporal image correlation spectroscopy and its extension to cross-correlation analysis, are applied here to the case of early stage embryos of zebrafish.
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Affiliation(s)
- Nicolo G Ceffa
- Università di Milano-Bicocca, Dipartimento di Fisica, Milano, Italy
| | - Ilaria Cesana
- Università di Milano-Bicocca, Dipartimento di Fisica, Milano, Italy
| | - Maddalena Collini
- Università di Milano-Bicocca, Dipartimento di Fisica, Milano, Italy
- Institute of Applied Sciences and Intelligent Systems, CNR-ISASI, Pozzuoli, Italy
- Università di Milano-Bicocca, Nanomedicine Center, Monza, Italy
| | - Laura D'Alfonso
- Università di Milano-Bicocca, Dipartimento di Fisica, Milano, Italy
| | | | | | - Laura Sironi
- Università di Milano-Bicocca, Dipartimento di Fisica, Milano, Italy
| | - Giuseppe Chirico
- Università di Milano-Bicocca, Dipartimento di Fisica, Milano, Italy
- Institute of Applied Sciences and Intelligent Systems, CNR-ISASI, Pozzuoli, Italy
- Università di Milano-Bicocca, Nanomedicine Center, Monza, Italy
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Thomen P, Robert J, Monmeyran A, Bitbol AF, Douarche C, Henry N. Bacterial biofilm under flow: First a physical struggle to stay, then a matter of breathing. PLoS One 2017; 12:e0175197. [PMID: 28403171 PMCID: PMC5389662 DOI: 10.1371/journal.pone.0175197] [Citation(s) in RCA: 70] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2016] [Accepted: 03/22/2017] [Indexed: 02/02/2023] Open
Abstract
Bacterial communities attached to surfaces under fluid flow represent a widespread lifestyle of the microbial world. Through shear stress generation and molecular transport regulation, hydrodynamics conveys effects that are very different by nature but strongly coupled. To decipher the influence of these levers on bacterial biofilms immersed in moving fluids, we quantitatively and simultaneously investigated physicochemical and biological properties of the biofilm. We designed a millifluidic setup allowing to control hydrodynamic conditions and to monitor biofilm development in real time using microscope imaging. We also conducted a transcriptomic analysis to detect a potential physiological response to hydrodynamics. We discovered that a threshold value of shear stress determined biofilm settlement, with sub-piconewton forces sufficient to prevent biofilm initiation. As a consequence, distinct hydrodynamic conditions, which set spatial distribution of shear stress, promoted distinct colonization patterns with consequences on the growth mode. However, no direct impact of mechanical forces on biofilm growth rate was observed. Consistently, no mechanosensing gene emerged from our differential transcriptomic analysis comparing distinct hydrodynamic conditions. Instead, we found that hydrodynamic molecular transport crucially impacts biofilm growth by controlling oxygen availability. Our results shed light on biofilm response to hydrodynamics and open new avenues to achieve informed design of fluidic setups for investigating, engineering or fighting adherent communities.
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Affiliation(s)
- Philippe Thomen
- Sorbonne Universités, UPMC Univ Paris 06 & CNRS, UMR 8237, Laboratoire Jean Perrin, Paris, France
| | - Jérôme Robert
- Sorbonne Universités, UPMC Univ Paris 06 & CNRS, UMR 8237, Laboratoire Jean Perrin, Paris, France
| | - Amaury Monmeyran
- Sorbonne Universités, UPMC Univ Paris 06 & CNRS, UMR 8237, Laboratoire Jean Perrin, Paris, France
| | - Anne-Florence Bitbol
- Sorbonne Universités, UPMC Univ Paris 06 & CNRS, UMR 8237, Laboratoire Jean Perrin, Paris, France
| | - Carine Douarche
- Université Paris Sud, UMR 8502, Laboratoire de Physique des Solides, Orsay, France
| | - Nelly Henry
- Sorbonne Universités, UPMC Univ Paris 06 & CNRS, UMR 8237, Laboratoire Jean Perrin, Paris, France
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