1
|
Stanciu SG, Hristu R, Stanciu GA, Tranca DE, Eftimie L, Dumitru A, Costache M, Stenmark HA, Manders H, Cherian A, Tark-Dame M, Manders EMM. Super-resolution re-scan second harmonic generation microscopy. Proc Natl Acad Sci U S A 2022; 119:e2214662119. [PMID: 36375085 PMCID: PMC9704717 DOI: 10.1073/pnas.2214662119] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2022] [Accepted: 10/13/2022] [Indexed: 07/26/2023] Open
Abstract
Second harmonic generation microscopy (SHG) is generally acknowledged as a powerful tool for the label-free three-dimensional visualization of tissues and advanced materials, with one of its most popular applications being collagen imaging. Despite the great need, progress in super-resolved SHG imaging lags behind the developments reported over the past years in fluorescence-based optical nanoscopy. In this work, we demonstrate super-resolved re-scan SHG, qualitatively and quantitatively showing on collagenous tissues the available resolution advantage over the diffraction limit. We introduce as well super-resolved re-scan two-photon excited fluorescence microscopy, an imaging modality not explored to date.
Collapse
Affiliation(s)
- Stefan G. Stanciu
- Center for Microscopy-Microanalysis and Information Processing, University Politehnica of Bucharest, 060042 Bucharest, Romania
| | - Radu Hristu
- Center for Microscopy-Microanalysis and Information Processing, University Politehnica of Bucharest, 060042 Bucharest, Romania
| | - George A. Stanciu
- Center for Microscopy-Microanalysis and Information Processing, University Politehnica of Bucharest, 060042 Bucharest, Romania
| | - Denis E. Tranca
- Center for Microscopy-Microanalysis and Information Processing, University Politehnica of Bucharest, 060042 Bucharest, Romania
| | - Lucian Eftimie
- Pathology Department, Emergency Military Hospital, 010825 Bucharest, Romania
| | - Adrian Dumitru
- Department of Pathology, Bucharest Emergency University Hospital, 050098 Bucharest, Romania
- Department of Pathology, Carol Davila University of Medicine and Pharmacy, 050474 Bucharest, Romania
| | - Mariana Costache
- Department of Pathology, Bucharest Emergency University Hospital, 050098 Bucharest, Romania
- Department of Pathology, Carol Davila University of Medicine and Pharmacy, 050474 Bucharest, Romania
| | - Harald A. Stenmark
- Department of Molecular Cell Biology, Institute for Cancer Research, Oslo University Hospital, 0379 Oslo, Norway
| | - Harm Manders
- Confocal.nl BV, Science Park 406, 1098XG Amsterdam, The Netherlands
| | - Amit Cherian
- Confocal.nl BV, Science Park 406, 1098XG Amsterdam, The Netherlands
| | | | | |
Collapse
|
2
|
Iconaru SL, Ciobanu CS, Predoi G, Rokosz K, Chifiriuc MC, Bleotu C, Stanciu G, Hristu R, Raaen S, Raita SM, Ghegoiu L, Badea ML, Predoi D. Biological and Physico-Chemical Properties of Composite Layers Based on Magnesium-Doped Hydroxyapatite in Chitosan Matrix. Micromachines (Basel) 2022; 13:1574. [PMID: 36295927 PMCID: PMC9608974 DOI: 10.3390/mi13101574] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/31/2022] [Revised: 09/13/2022] [Accepted: 09/19/2022] [Indexed: 06/16/2023]
Abstract
In the present study, we report the development and characterization of composite layers (by spin coating) based on magnesium-doped hydroxyapatite in a chitosan matrix, (Ca10-xMgx(PO4)6(OH)2; xMg = 0, 0.08 and 0.3; HApCh, 8MgHApCh and 30MgHApCh). The MgHApCh composite layers were investigated using scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), and X-ray photoelectron spectroscopy (XPS) techniques. The in vitro biological evaluation included the assessment of their cytotoxicity on MG63 osteoblast-like cells and antifungal activity against Candida albicans ATCC 10231 fungal cell lines. The results of the physico-chemical characterization highlighted the obtaining of uniform and homogeneous composite layers. In addition, the biological assays demonstrated that the increase in the magnesium concentration in the samples enhanced the antifungal effect but also decreased their cytocompatibility. However, for certain optimal magnesium ion concentrations, the composite layers presented both excellent biocompatibility and antifungal properties, suggesting their promising potential for biomedical applications in both implantology and dentistry.
Collapse
Affiliation(s)
- Simona Liliana Iconaru
- National Institute of Materials Physics, 405A Atomistilor Street, 077125 Magurele, Romania
| | - Carmen Steluta Ciobanu
- National Institute of Materials Physics, 405A Atomistilor Street, 077125 Magurele, Romania
| | - Gabriel Predoi
- Faculty of Veterinary Medicine, University of Agronomic Sciences and Veterinary Medicine of Bucharest, 105 Splaiul Independentei, 050097 Bucharest, Romania
| | - Krzysztof Rokosz
- Faculty of Electronics and Computer Science, Koszalin University of Technology, Sniadeckich 2, PL 75-453 Koszalin, Poland
| | - Mariana Carmen Chifiriuc
- Life, Environmental and Earth Sciences Division, Research Institute of the University of Bucharest (ICUB), University of Bucharest, 060023 Bucharest, Romania
- Academy of Romanian Scientists, 54 Splaiul Independentei Street, 050085 Bucharest, Romania
- Biological Sciences Division, The Romanian Academy, 25 Calea Victoriei, 010071 Bucharest, Romania
| | - Coralia Bleotu
- Life, Environmental and Earth Sciences Division, Research Institute of the University of Bucharest (ICUB), University of Bucharest, 060023 Bucharest, Romania
- Stefan Nicolau Virology Institute, 285 Mihai Bravu Avenue, 030304 Bucharest, Romania
| | - George Stanciu
- Center for Microscopy-Microanalysis and Information Processing, University Politehnica of Bucharest, 313 Splaiul Independentei, 060042 Bucharest, Romania
| | - Radu Hristu
- Center for Microscopy-Microanalysis and Information Processing, University Politehnica of Bucharest, 313 Splaiul Independentei, 060042 Bucharest, Romania
| | - Steinar Raaen
- Department of Physics, Norwegian University of Science and Technology (NTNU), Realfagbygget E3-124 Høgskoleringen 5, NO 7491 Trondheim, Norway
| | - Stefania Mariana Raita
- Faculty of Veterinary Medicine, University of Agronomic Sciences and Veterinary Medicine of Bucharest, 105 Splaiul Independentei, 050097 Bucharest, Romania
| | - Liliana Ghegoiu
- National Institute of Materials Physics, 405A Atomistilor Street, 077125 Magurele, Romania
| | - Monica Luminita Badea
- National Institute of Materials Physics, 405A Atomistilor Street, 077125 Magurele, Romania
- Faculty of Horticulture, University of Agronomic Sciences and Veterinary Medicine, 59 Marasti Boulevard, 011464 Bucharest, Romania
| | - Daniela Predoi
- National Institute of Materials Physics, 405A Atomistilor Street, 077125 Magurele, Romania
| |
Collapse
|
3
|
Stanciu SG, Tranca DE, Zampini G, Hristu R, Stanciu GA, Chen X, Liu M, Stenmark HA, Latterini L. Scattering-type Scanning Near-Field Optical Microscopy of Polymer-Coated Gold Nanoparticles. ACS Omega 2022; 7:11353-11362. [PMID: 35415325 PMCID: PMC8992282 DOI: 10.1021/acsomega.2c00410] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/20/2022] [Accepted: 03/07/2022] [Indexed: 05/14/2023]
Abstract
Scattering-type scanning near-field optical microscopy (s-SNOM) has emerged over the past years as a powerful characterization tool that can probe important properties of advanced materials and biological samples in a label-free manner, with spatial resolutions lying in the nanoscale realm. In this work, we explore such usefulness in relationship with an interesting class of materials: polymer-coated gold nanoparticles (NPs). As thoroughly discussed in recent works, the interplay between the Au core and the polymeric shell has been found to be important in many applications devoted to biomedicine. We investigate bare Au NPs next to polystyrenesulfonate (PSS) and poly(diallyldimethylammonium chloride) (PDDA) coated ones under 532 nm laser excitation, an wavelength matching the surface plasmon band of the custom-synthesized nanoparticles. We observe consistent s-SNOM phase signals in the case of bare and shallow-coated Au NPs, whereas for thicker shell instances, these signals fade. For all investigated samples, the s-SNOM amplitude signals were found to be very weak, which may be related to reduced scattering efficiency due to absorption of the incident beam. We consider these observations important, as they may facilitate studies and applications in nanomedicine and nanotechnology where the precise positioning of polymer-coated Au NPs with nanoscale resolution is needed besides their dielectric function and related intrinsic optical properties, which are also quantitatively available with s-SNOM.
Collapse
Affiliation(s)
- Stefan G. Stanciu
- Center
for Microscopy-Microanalysis and Information Processing, Politehnica University of Bucharest, Bucharest, 060042, Romania
| | - Denis E. Tranca
- Center
for Microscopy-Microanalysis and Information Processing, Politehnica University of Bucharest, Bucharest, 060042, Romania
| | - Giulia Zampini
- Department
of Chemistry, Biology and Biotechnology, Perugia University, Via Elce di sotto, 8, 06123 Perugia, Italy
| | - Radu Hristu
- Center
for Microscopy-Microanalysis and Information Processing, Politehnica University of Bucharest, Bucharest, 060042, Romania
| | - George A. Stanciu
- Center
for Microscopy-Microanalysis and Information Processing, Politehnica University of Bucharest, Bucharest, 060042, Romania
| | - Xinzhong Chen
- Department
of Physics and Astronomy, Stony Brook University, Stony Brook, New York 11794, United States
| | - Mengkun Liu
- Department
of Physics and Astronomy, Stony Brook University, Stony Brook, New York 11794, United States
- National
Synchrotron Light Source II, Brookhaven National Laboratory, Upton, New York 11973, United States
| | - Harald A. Stenmark
- Department
of Molecular Cell Biology, Institute for Cancer Research, Oslo University Hospital, Oslo 0379, Norway
| | - Loredana Latterini
- Department
of Chemistry, Biology and Biotechnology, Perugia University, Via Elce di sotto, 8, 06123 Perugia, Italy
| |
Collapse
|
4
|
Hristu R, Eftimie LG, Stanciu SG, Glogojeanu RR, Gheorghita P, Stanciu GA. Assessment of Extramammary Paget Disease by Two-Photon Microscopy. Front Med (Lausanne) 2022; 9:839786. [PMID: 35280872 PMCID: PMC8913931 DOI: 10.3389/fmed.2022.839786] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2021] [Accepted: 01/24/2022] [Indexed: 12/29/2022] Open
Abstract
Two-photon microscopy techniques are non-linear optical imaging methods which are gaining momentum in the investigation of fixed tissue sections, fresh tissue or even for in vivo experiments. Two-photon excited fluorescence and second harmonic generation are two non-linear optical contrast mechanisms which can be simultaneously used for offering complementary information on the tissue architecture. While the former can originate from endogenous autofluorescence sources (e.g., NADH, FAD, elastin, keratin, lipofuscins, or melanin), or exogenous eosin, the latter is generated in fibrillar structures within living organisms (e.g., collagen and myosin). Here we test the ability of both these contrast mechanisms to highlight features of the extramammary Paget disease on fixed tissue sections prepared for standard histological examination using immunohistochemical markers and hematoxylin and eosin staining. We also demonstrate the label-free abilities of both imaging techniques to highlight histological features on unstained fixed tissue sections. The study demonstrated that two-photon microscopy can detect specific cellular features of the extramammary Paget disease in good correlation with histopathological results.
Collapse
Affiliation(s)
- Radu Hristu
- Center for Microscopy-Microanalysis and Information Processing, University Politehnica of Bucharest, Bucharest, Romania
| | - Lucian G. Eftimie
- Center for Microscopy-Microanalysis and Information Processing, University Politehnica of Bucharest, Bucharest, Romania
- Pathology Department, Central University Emergency Military Hospital, Bucharest, Romania
| | - Stefan G. Stanciu
- Center for Microscopy-Microanalysis and Information Processing, University Politehnica of Bucharest, Bucharest, Romania
| | - Remus R. Glogojeanu
- Department of Special Motricity and Medical Recovery, The National University of Physical Education and Sports, Bucharest, Romania
| | - Pavel Gheorghita
- Center for Microscopy-Microanalysis and Information Processing, University Politehnica of Bucharest, Bucharest, Romania
- Faculty of Energetics, University Politehnica of Bucharest, Bucharest, Romania
| | - George A. Stanciu
- Center for Microscopy-Microanalysis and Information Processing, University Politehnica of Bucharest, Bucharest, Romania
| |
Collapse
|
5
|
Hristu R, Stanciu SG, Dumitru A, Paun B, Floroiu I, Costache M, Stanciu GA. Influence of hematoxylin and eosin staining on the quantitative analysis of second harmonic generation imaging of fixed tissue sections. Biomed Opt Express 2021; 12:5829-5843. [PMID: 34692218 PMCID: PMC8515976 DOI: 10.1364/boe.428701] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2021] [Revised: 07/20/2021] [Accepted: 07/20/2021] [Indexed: 05/13/2023]
Abstract
Second harmonic generation (SHG) microscopy has emerged over the past two decades as a powerful tool for tissue characterization and diagnostics. Its main applications in medicine are related to mapping the collagen architecture of in-vivo, ex-vivo and fixed tissues based on endogenous contrast. In this work we present how H&E staining of excised and fixed tissues influences the extraction and use of image parameters specific to polarization-resolved SHG (PSHG) microscopy, which are known to provide quantitative information on the collagen structure and organization. We employ a theoretical collagen model for fitting the experimental PSHG datasets to obtain the second order susceptibility tensor elements ratios and the fitting efficiency. Furthermore, the second harmonic intensity acquired under circular polarization is investigated. The evolution of these parameters in both forward- and backward-collected SHG are computed for both H&E-stained and unstained tissue sections. Consistent modifications are observed between the two cases in terms of the fitting efficiency and the second harmonic intensity. This suggests that similar quantitative analysis workflows applied to PSHG images collected on stained and unstained tissues could yield different results, and hence affect the diagnostic accuracy.
Collapse
Affiliation(s)
- Radu Hristu
- Center for Microcopy-Microanalysis and Information Processing, University Politehnica of Bucharest, 060042 Bucharest, Romania
| | - Stefan G. Stanciu
- Center for Microcopy-Microanalysis and Information Processing, University Politehnica of Bucharest, 060042 Bucharest, Romania
| | - Adrian Dumitru
- Department of Pathology, Carol Davila University of Medicine and Pharmacy, 050474 Bucharest, Romania
| | - Bogdan Paun
- Faculty of Automation and Computer Science, Technical University of Cluj-Napoca, 40002 Cluj-Napoca, Romania
| | - Iustin Floroiu
- Center for Microcopy-Microanalysis and Information Processing, University Politehnica of Bucharest, 060042 Bucharest, Romania
| | - Mariana Costache
- Department of Pathology, Carol Davila University of Medicine and Pharmacy, 050474 Bucharest, Romania
| | - George A. Stanciu
- Center for Microcopy-Microanalysis and Information Processing, University Politehnica of Bucharest, 060042 Bucharest, Romania
| |
Collapse
|
6
|
Hristu R, Eftimie LG, Paun B, Stanciu SG, Stanciu GA. Pixel-level angular quantification of capsular collagen in second harmonic generation microscopy images of encapsulated thyroid nodules. J Biophotonics 2020; 13:e202000262. [PMID: 32888377 DOI: 10.1002/jbio.202000262] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2020] [Revised: 08/11/2020] [Accepted: 08/27/2020] [Indexed: 05/11/2023]
Abstract
Polarization-resolved second harmonic generation microscopy is used to provide pixel-level angular distribution of collagen in thyroid nodule capsules. The pixel-level angular distribution is combined with textural analysis to quantify the collagen distribution in follicular adenoma (benign) and papillary thyroid carcinoma (malignant). Three second order nonlinear susceptibility tensor elements ratios, the collagen angular distribution and two parameters accounting for the collagen angular dispersion in different sized areas are extracted and corresponding images are computed in a pixel-by-pixel fashion. Subsequently, we show that texture analysis can be performed on these images to detect significant differences between the considered benign and malignant nodule capsules.
Collapse
Affiliation(s)
- Radu Hristu
- Center for Microscopy-Microanalysis and Information Processing, University Politehnica of Bucharest, Bucharest, Romania
| | - Lucian G Eftimie
- Center for Microscopy-Microanalysis and Information Processing, University Politehnica of Bucharest, Bucharest, Romania
- Department of Pathology, Central University Emergency Military Hospital, Bucharest, Romania
- Department of Pathology, Carol Davila University of Medicine and Pharmacy, Bucharest, Romania
| | - Bogdan Paun
- Center for Microscopy-Microanalysis and Information Processing, University Politehnica of Bucharest, Bucharest, Romania
- Faculty of Automation and Computer Science, Technical University of Cluj-Napoca, Cluj-Napoca, Romania
| | - Stefan G Stanciu
- Center for Microscopy-Microanalysis and Information Processing, University Politehnica of Bucharest, Bucharest, Romania
| | - George A Stanciu
- Center for Microscopy-Microanalysis and Information Processing, University Politehnica of Bucharest, Bucharest, Romania
| |
Collapse
|
7
|
Lucidi M, Tranca DE, Nichele L, Ünay D, Stanciu GA, Visca P, Holban AM, Hristu R, Cincotti G, Stanciu SG. SSNOMBACTER: A collection of scattering-type scanning near-field optical microscopy and atomic force microscopy images of bacterial cells. Gigascience 2020; 9:giaa129. [PMID: 33231675 PMCID: PMC7684706 DOI: 10.1093/gigascience/giaa129] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2020] [Revised: 10/20/2020] [Accepted: 10/27/2020] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND In recent years, a variety of imaging techniques operating at nanoscale resolution have been reported. These techniques have the potential to enrich our understanding of bacterial species relevant to human health, such as antibiotic-resistant pathogens. However, owing to the novelty of these techniques, their use is still confined to addressing very particular applications, and their availability is limited owing to associated costs and required expertise. Among these, scattering-type scanning near field optical microscopy (s-SNOM) has been demonstrated as a powerful tool for exploring important optical properties at nanoscale resolution, depending only on the size of a sharp tip. Despite its huge potential to resolve aspects that cannot be tackled otherwise, the penetration of s-SNOM into the life sciences is still proceeding at a slow pace for the aforementioned reasons. RESULTS In this work we introduce SSNOMBACTER, a set of s-SNOM images collected on 15 bacterial species. These come accompanied by registered Atomic Force Microscopy images, which are useful for placing nanoscale optical information in a relevant topographic context. CONCLUSIONS The proposed dataset aims to augment the popularity of s-SNOM and for accelerating its penetration in life sciences. Furthermore, we consider this dataset to be useful for the development and benchmarking of image analysis tools dedicated to s-SNOM imaging, which are scarce, despite the high need. In this latter context we discuss a series of image processing and analysis applications where SSNOMBACTER could be of help.
Collapse
Affiliation(s)
- Massimiliano Lucidi
- University Roma Tre, Department of Engineering, via Vito Volterra 62, Rome, 00146, Italy
| | - Denis E Tranca
- University Politehnica of Bucharest, Center for Microscopy-Microanalysis and Information Processing, 313 Splaiul Independentei, Bucharest,060042, Romania
| | - Lorenzo Nichele
- University Roma Tre, Department of Engineering, via Vito Volterra 62, Rome, 00146, Italy
| | - Devrim Ünay
- İzmir Democracy University, Faculty of Engineering, Electrical and Electronics Engineering, 14 Gürsel Aksel Bulvarı, İzmir, 35140, Turkey
| | - George A Stanciu
- University Politehnica of Bucharest, Center for Microscopy-Microanalysis and Information Processing, 313 Splaiul Independentei, Bucharest,060042, Romania
| | - Paolo Visca
- University Roma Tre, Department of Science, via Vito Volterra 62, Rome, 00146, Italy
| | - Alina Maria Holban
- University of Bucharest, Faculty of Biology, Department of Microbiology and Immunology, 1-3 Aleea Portocalelor, Bucharest, 060101, Romania
| | - Radu Hristu
- University Politehnica of Bucharest, Center for Microscopy-Microanalysis and Information Processing, 313 Splaiul Independentei, Bucharest,060042, Romania
| | - Gabriella Cincotti
- University Roma Tre, Department of Engineering, via Vito Volterra 62, Rome, 00146, Italy
| | - Stefan G Stanciu
- University Politehnica of Bucharest, Center for Microscopy-Microanalysis and Information Processing, 313 Splaiul Independentei, Bucharest,060042, Romania
| |
Collapse
|
8
|
Lucidi M, Hristu R, Nichele L, Stanciu GA, Tranca DE, Holban AM, Visca P, Stanciu SG, Cincotti G. STED nanoscopy of KK114-stained pathogenic bacteria. J Biophotonics 2020; 13:e202000097. [PMID: 32483852 DOI: 10.1002/jbio.202000097] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2020] [Revised: 05/11/2020] [Accepted: 05/27/2020] [Indexed: 06/11/2023]
Abstract
Super-resolution microscopy techniques can provide answers to still pending questions on prokaryotic organisms but are yet to be used at their full potential for this purpose. To address this, we evaluate the ability of the rhodamine-like KK114 dye to label various types of bacteria, to enable imaging of fine structural details with stimulated emission depletion microscopy (STED). We assessed fluorescent labeling with KK114 for eleven Gram-positive and Gram-negative bacterial species and observed that this contrast agent binds to their cell membranes. Significant differences in the labeling outputs were noticed across the tested bacterial species, but importantly, KK114-staining allowed the observation of subtle nanometric cell details in some cases. For example, a helix pattern resembling a cytoskeleton arrangement was detected in Bacillus subtilis. Furthermore, we found that KK114 easily penetrates the membrane of bacterial microorganism that lost their viability, which can be useful to discriminate between living and dead cells.
Collapse
Affiliation(s)
| | - Radu Hristu
- Center for Microscopy - Microanalysis and Information Processing, University Politehnica of Bucharest, Bucharest, Romania
| | | | - George A Stanciu
- Center for Microscopy - Microanalysis and Information Processing, University Politehnica of Bucharest, Bucharest, Romania
| | - Denis E Tranca
- Center for Microscopy - Microanalysis and Information Processing, University Politehnica of Bucharest, Bucharest, Romania
| | - Alina Maria Holban
- Microbiology and Immunology Department, Faculty of Biology, University of Bucharest, Bucharest, Romania
| | - Paolo Visca
- Department of Sciences, University Roma Tre, Rome, Italy
| | - Stefan G Stanciu
- Center for Microscopy - Microanalysis and Information Processing, University Politehnica of Bucharest, Bucharest, Romania
| | | |
Collapse
|
9
|
Bueno JM, Ávila FJ, Hristu R, Stanciu SG, Eftimie L, Stanciu GA. Objective analysis of collagen organization in thyroid nodule capsules using second harmonic generation microscopy images and the Hough transform. Appl Opt 2020; 59:6925-6931. [PMID: 32788782 DOI: 10.1364/ao.393721] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/26/2020] [Accepted: 06/29/2020] [Indexed: 06/11/2023]
Abstract
Papillary carcinoma is the most prevalent type of thyroid cancer. Its diagnosis requires accurate and subjective analyses from expert pathologists. Here we propose a method based on the Hough transform (HT) to detect and objectively quantify local structural differences in collagen thyroid nodule capsules. Second harmonic generation (SHG) microscopy images were acquired on non-stained histological sections of capsule fragments surrounding the healthy thyroid gland and benign and tumoral/malignant nodules. The HT was applied to each SHG image to extract numerical information on the organization of the collagen architecture in the tissues under analysis. Results show that control thyroid capsule samples present a non-organized structure composed of wavy collagen distribution with local orientations. On the opposite, in capsules surrounding malignant nodules, a remodeling of the collagen network takes place and local undulations disappear, resulting in an aligned pattern with a global preferential orientation. The HT procedure was able to quantitatively differentiate thyroid capsules from capsules surrounding papillary thyroid carcinoma (PTC) nodules. Moreover, the algorithm also reveals that the collagen arrangement of the capsules surrounding benign nodules significantly differs from both the thyroid control and PTC nodule capsules. Combining SHG imaging with the HT results thus in an automatic and objective tool to discriminate between the pathological modifications that affect the capsules of thyroid nodules across the progressions of PTC, with potential to be used in clinical settings to complement current state-of-the-art diagnostic methods.
Collapse
|
10
|
Huttunen MJ, Hristu R, Dumitru A, Floroiu I, Costache M, Stanciu SG. Multiphoton microscopy of the dermoepidermal junction and automated identification of dysplastic tissues with deep learning. Biomed Opt Express 2020; 11:186-199. [PMID: 32010509 PMCID: PMC6968761 DOI: 10.1364/boe.11.000186] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/02/2019] [Revised: 10/24/2019] [Accepted: 11/05/2019] [Indexed: 05/05/2023]
Abstract
Histopathological image analysis performed by a trained expert is currently regarded as the gold-standard for the diagnostics of many pathologies, including cancers. However, such approaches are laborious, time consuming and contain a risk for bias or human error. There is thus a clear need for faster, less intrusive and more accurate diagnostic solutions, requiring also minimal human intervention. Multiphoton microscopy (MPM) can alleviate some of the drawbacks specific to traditional histopathology by exploiting various endogenous optical signals to provide virtual biopsies that reflect the architecture and composition of tissues, both in-vivo or ex-vivo. Here we show that MPM imaging of the dermoepidermal junction (DEJ) in unstained fixed tissues provides useful cues for a histopathologist to identify the onset of non-melanoma skin cancers. Furthermore, we show that MPM images collected on the DEJ, besides being easy to interpret by a trained specialist, can be automatically classified into healthy and dysplastic classes with high precision using a Deep Learning method and existing pre-trained convolutional neural networks. Our results suggest that deep learning enhanced MPM for in-vivo skin cancer screening could facilitate timely diagnosis and intervention, enabling thus more optimal therapeutic approaches.
Collapse
Affiliation(s)
- Mikko J. Huttunen
- Photonics Laboratory, Physics Unit, Tampere University, Tampere, Finland
- These authors contributed equally to this work
| | - Radu Hristu
- Center for Microscopy-Microanalysis and Information Processing, Politehnica University of Bucharest, Bucharest, Romania
- These authors contributed equally to this work
| | - Adrian Dumitru
- Department of Pathology, Carol Davila University of Medicine and Pharmacy, Bucharest, Romania
- These authors contributed equally to this work
| | - Iustin Floroiu
- Center for Microscopy-Microanalysis and Information Processing, Politehnica University of Bucharest, Bucharest, Romania
- Faculty of Medical Engineering, Politehnica University of Bucharest, Bucharest, Romania
| | - Mariana Costache
- Department of Pathology, Carol Davila University of Medicine and Pharmacy, Bucharest, Romania
| | - Stefan G. Stanciu
- Center for Microscopy-Microanalysis and Information Processing, Politehnica University of Bucharest, Bucharest, Romania
| |
Collapse
|
11
|
Hristu R, Eftimie LG, Stanciu SG, Tranca DE, Paun B, Sajin M, Stanciu GA. Quantitative second harmonic generation microscopy for the structural characterization of capsular collagen in thyroid neoplasms. Biomed Opt Express 2018; 9:3923-3936. [PMID: 30338165 PMCID: PMC6191628 DOI: 10.1364/boe.9.003923] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/13/2018] [Revised: 07/13/2018] [Accepted: 07/14/2018] [Indexed: 05/11/2023]
Abstract
Quantitative second harmonic generation microscopy was used to investigate collagen organization in the fibrillar capsules of human benign and malignant thyroid nodules. We demonstrate that the combination of texture analysis and second harmonic generation images of collagen can be used to differentiate between capsules surrounding the thyroid follicular adenoma and papillary carcinoma nodules. Our findings indicate that second harmonic generation microscopy can provide quantitative information about the collagenous capsule surrounding both the thyroid and thyroid nodules, which may complement traditional histopathological examination.
Collapse
Affiliation(s)
- Radu Hristu
- Center for Microcopy-Microanalysis and Information Processing, University Politehnica of Bucharest, Bucharest, Romania
| | - Lucian G Eftimie
- Center for Microcopy-Microanalysis and Information Processing, University Politehnica of Bucharest, Bucharest, Romania
- Central University Emergency Military Hospital, Pathology Department, 134 Calea Plevnei, 010825 Bucharest, Romania
- Carol Davila University of Medicine and Pharmacy, 37 Dionisie Lupu, 030167 Bucharest, Romania
| | - Stefan G Stanciu
- Center for Microcopy-Microanalysis and Information Processing, University Politehnica of Bucharest, Bucharest, Romania
| | - Denis E Tranca
- Center for Microcopy-Microanalysis and Information Processing, University Politehnica of Bucharest, Bucharest, Romania
| | - Bogdan Paun
- Faculty of Energetics, University Politehnica of Bucharest, 313 Splaiul Independentei, 060042 Bucharest, Romania
- Currently with Faculty of Automation and Computer Science, Technical University of Cluj-Napoca, 26-28 George Baritiu St, 40002 Cluj-Napoca, Romania
| | - Maria Sajin
- Carol Davila University of Medicine and Pharmacy, 37 Dionisie Lupu, 030167 Bucharest, Romania
| | - George A Stanciu
- Center for Microcopy-Microanalysis and Information Processing, University Politehnica of Bucharest, Bucharest, Romania
| |
Collapse
|
12
|
Stanciu SG, Tranca DE, Hristu R, Stanciu GA. Correlative imaging of biological tissues with apertureless scanning near-field optical microscopy and confocal laser scanning microscopy. Biomed Opt Express 2017; 8:5374-5383. [PMID: 29296474 PMCID: PMC5745089 DOI: 10.1364/boe.8.005374] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/19/2017] [Revised: 11/01/2017] [Accepted: 11/01/2017] [Indexed: 05/27/2023]
Abstract
Apertureless scanning near-field optical microscopy (ASNOM) has attracted considerable interest over the past years as a result of its valuable contrast mechanisms and capabilities for optical resolutions in the nanoscale range. However, at this moment the intersections between ASNOM and the realm of bioimaging are scarce, mainly due to data interpretation difficulties linked to the limited body of work performed so far in this field and hence the reduced volume of supporting information. We propose an imaging approach that holds significant potential for alleviating this issue, consisting of correlative imaging of biological specimens using a multimodal system that incorporates ASNOM and confocal laser scanning microscopy (CLSM), which allows placing near-field data into a well understood context of anatomical relevance. We demonstrate this approach on zebrafish retinal tissue. The proposed method holds important implications for the in-depth understanding of biological items through the prism of ASNOM and CLSM data complementarity.
Collapse
Affiliation(s)
- Stefan G. Stanciu
- Center for Microscopy-Microanalysis and Information Processing, University Politehnica of Bucharest, Bucharest, 060042, Romania
| | - Denis E. Tranca
- Center for Microscopy-Microanalysis and Information Processing, University Politehnica of Bucharest, Bucharest, 060042, Romania
| | - Radu Hristu
- Center for Microscopy-Microanalysis and Information Processing, University Politehnica of Bucharest, Bucharest, 060042, Romania
| | - George A. Stanciu
- Center for Microscopy-Microanalysis and Information Processing, University Politehnica of Bucharest, Bucharest, 060042, Romania
| |
Collapse
|
13
|
Stanciu SG, Ávila FJ, Hristu R, Bueno JM. A Study on Image Quality in Polarization-Resolved Second Harmonic Generation Microscopy. Sci Rep 2017; 7:15476. [PMID: 29133836 PMCID: PMC5684207 DOI: 10.1038/s41598-017-15257-0] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2017] [Accepted: 10/24/2017] [Indexed: 01/21/2023] Open
Abstract
Second harmonic generation (SHG) microscopy represents a very powerful tool for tissue characterization. Polarization-resolved SHG (PSHG) microscopy extends the potential of SHG, by exploiting the dependence of SHG signals on the polarization state of the excitation beam. Among others, this dependence translates to the fact that SHG images collected under different polarization configurations exhibit distinct characteristics in terms of content and appearance. These characteristics hold deep implications over image quality, as perceived by human observers or by image analysis methods custom designed to automatically extract a quality factor from digital images. Our work addresses this subject, by investigating how basic image properties and the outputs of no-reference image quality assessment methods correlate to human expert opinion in the case of PSHG micrographs. Our evaluation framework is based on SHG imaging of collagen-based ocular tissues under different linear and elliptical polarization states of the incident light.
Collapse
Affiliation(s)
- Stefan G Stanciu
- Center for Microscopy-Microanalysis and Information Processing, University Politehnica of Bucharest, Bucharest, Romania.
| | | | - Radu Hristu
- Center for Microscopy-Microanalysis and Information Processing, University Politehnica of Bucharest, Bucharest, Romania
| | - Juan M Bueno
- Laboratorio de Óptica, Universidad de Murcia, Murcia, Spain.
| |
Collapse
|
14
|
Tranca DE, Stanciu SG, Hristu R, Witgen BM, Stanciu GA. Nanoscale mapping of refractive index by using scattering-type scanning near-field optical microscopy. Nanomedicine 2017; 14:47-50. [PMID: 28887212 DOI: 10.1016/j.nano.2017.08.016] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/05/2017] [Revised: 06/19/2017] [Accepted: 08/24/2017] [Indexed: 01/21/2023]
Abstract
We present a novel method for nanoscale reconstruction of complex refractive index by using scattering-type Scanning Near-field Optical Microscopy (s-SNOM). Our method relies on correlating s-SNOM experimental image data with computational data obtained through simulation of the classical oscillating point-dipole model. This results in assigning a certain dielectric function for every pixel of the s-SNOM images, which further results in nanoscale mapping of the refractive index. This method is employed on human erythrocytes to demonstrate the approach in a biologically relevant manner. The presented results advance the current knowledge on the capabilities of s-SNOM to extract quantitative information with nanoscale resolution from optical data sets with biological application.
Collapse
Affiliation(s)
- Denis E Tranca
- Center for Microscopy-Microanalysis and Information Processing, University Politehnica of Bucharest, Bucharest, Romania
| | - Stefan G Stanciu
- Center for Microscopy-Microanalysis and Information Processing, University Politehnica of Bucharest, Bucharest, Romania
| | - Radu Hristu
- Center for Microscopy-Microanalysis and Information Processing, University Politehnica of Bucharest, Bucharest, Romania
| | - Brent M Witgen
- Development Bioanalysis, Global Research, Novo Nordisk A/S, Måløv, Denmark
| | - George A Stanciu
- Center for Microscopy-Microanalysis and Information Processing, University Politehnica of Bucharest, Bucharest, Romania.
| |
Collapse
|
15
|
Hristu R, Stanciu SG, Tranca DE, Stanciu GA. Improved quantification of collagen anisotropy with polarization-resolved second harmonic generation microscopy. J Biophotonics 2017; 10:1171-1179. [PMID: 27774747 DOI: 10.1002/jbio.201600197] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/08/2016] [Revised: 09/16/2016] [Accepted: 09/28/2016] [Indexed: 05/02/2023]
Abstract
Imaging tissue samples by polarization-resolved second harmonic generation microscopy provides both qualitative and quantitative insights into collagen organization in a label-free manner. Polarization-resolved second harmonic generation microscopy goes beyond simple intensity-based imaging by adding the laser beam polarization component and applying different quantitative metrics such as the anisotropy factor. It thus provides valuable information on collagen arrangement not available with intensity measurements alone. Current established approaches are limited to calculating the anisotropy factor for only a particular laser beam polarization and no general guidelines on how to select the best laser beam polarization have yet been defined. Here, we introduce a novel methodology for selecting the optimal laser beam polarization for characterizing tissues using the anisotropy in the purpose of identifying cancer signatures. We show that the anisotropy factor exhibits a similar laser beam polarization dependence to the second harmonic intensity and we combine it with the collagen orientation index computed by Fast Fourier Transform analysis of the recorded images to establish a framework for choosing the laser beam polarization that is optimal for an accurate interpretation of polarization-resolved second harmonic generation microscopy images and anisotropy maps, and hence a better differentiation between healthy and dysplastic areas. SHG image of skin tissue (a) and a selected area of interest for which we compute the SHG intensity (b) and anisotropy factor (c) dependence on the laser beam polarization and also the FFT spectrum (d) to evaluate the collagen orientation index.
Collapse
Affiliation(s)
- Radu Hristu
- Center for Microscopy-Microanalysis and Information Processing, University Politehnica of Bucharest, 313 Splaiul Independentei, 060042, Bucharest, Romania
| | - Stefan G Stanciu
- Center for Microscopy-Microanalysis and Information Processing, University Politehnica of Bucharest, 313 Splaiul Independentei, 060042, Bucharest, Romania
| | - Denis E Tranca
- Center for Microscopy-Microanalysis and Information Processing, University Politehnica of Bucharest, 313 Splaiul Independentei, 060042, Bucharest, Romania
| | - George A Stanciu
- Center for Microscopy-Microanalysis and Information Processing, University Politehnica of Bucharest, 313 Splaiul Independentei, 060042, Bucharest, Romania
| |
Collapse
|
16
|
Dragoi IC, Stanciu SG, Hristu R, Coanda HG, Tranca DE, Popescu M, Coltuc D. Embedding complementary imaging data in laser scanning microscopy micrographs by reversible watermarking. Biomed Opt Express 2016; 7:1127-1137. [PMID: 27446641 PMCID: PMC4933558 DOI: 10.1364/boe.7.001127] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2015] [Revised: 02/05/2016] [Accepted: 02/05/2016] [Indexed: 06/06/2023]
Abstract
Complementary laser scanning microscopy micrographs are considered as pairs consisting in a master image (MI) and a slave image (SI), the latter with potential for facilitating the interpretation of the MI. We propose a strategy based on reversible watermarking for embedding a lossy compressed version of the SI into the MI. The use of reversible watermarking ensures the exact recovery of the host image. By storing and/or transmitting the watermarked MI in a single file, the information contained in both images that constitute the pair is made available to a potential end-user, which simplifies data association and transfer. Examples are presented using support images collected by two complementary techniques, confocal scanning laser microscopy and transmission laser scanning microscopy, on Hematoxylin and Eosin stained tissue fragments. A strategy for minimizing the watermarking distortions of the MI, while preserving the content of the SI, is discussed in detail.
Collapse
Affiliation(s)
- Ioan-Catalin Dragoi
- Electrical Engineering Department, Valahia University of Targoviste, Bd. Carol I, nr. 2, Targoviste, Romania
| | - Stefan G Stanciu
- Center for Microscopy-Microanalysis and Information Processing, University Politehnica of Bucharest, 313 Splaiul Independentei Bvd., Bucharest, Romania;
| | - Radu Hristu
- Center for Microscopy-Microanalysis and Information Processing, University Politehnica of Bucharest, 313 Splaiul Independentei Bvd., Bucharest, Romania
| | - Henri-George Coanda
- Electrical Engineering Department, Valahia University of Targoviste, Bd. Carol I, nr. 2, Targoviste, Romania
| | - Denis E Tranca
- Center for Microscopy-Microanalysis and Information Processing, University Politehnica of Bucharest, 313 Splaiul Independentei Bvd., Bucharest, Romania
| | - Marius Popescu
- Center for Microscopy-Microanalysis and Information Processing, University Politehnica of Bucharest, 313 Splaiul Independentei Bvd., Bucharest, Romania; Department of Plastic Surgery and Reconstructive Microsurgery, Clinical Emergency Hospital of Bucharest, 8 Calea Floreasca St., Bucharest, Romania
| | - Dinu Coltuc
- Electrical Engineering Department, Valahia University of Targoviste, Bd. Carol I, nr. 2, Targoviste, Romania;
| |
Collapse
|
17
|
Tranca DE, Sánchez-Ortiga E, Saavedra G, Martínez-Corral M, Tofail SAM, Stanciu SG, Hristu R, Stanciu GA. Mapping electron-beam-injected trapped charge with scattering scanning near-field optical microscopy. Opt Lett 2016; 41:1046-1049. [PMID: 26974112 DOI: 10.1364/ol.41.001046] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Scattering scanning near-field optical microscopy (s-SNOM) has been demonstrated as a valuable tool for mapping the optical and optoelectronic properties of materials with nanoscale resolution. Here we report experimental evidence that trapped electric charges injected by an electron beam at the surface of dielectric samples affect the sample-dipole interaction, which has direct impact on the s-SNOM image content. Nanoscale mapping of the surface trapped charge holds significant potential for the precise tailoring of the electrostatic properties of dielectric and semiconductive samples, such as hydroxyapatite, which has particular importance with respect to biomedical applications. The methodology developed here is highly relevant to semiconductor device fabrication as well.
Collapse
|
18
|
Tranca DE, Stanciu SG, Hristu R, Stoichita C, Tofail SAM, Stanciu GA. High-resolution quantitative determination of dielectric function by using scattering scanning near-field optical microscopy. Sci Rep 2015; 5:11876. [PMID: 26138665 PMCID: PMC5155613 DOI: 10.1038/srep11876] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2015] [Accepted: 05/28/2015] [Indexed: 12/21/2022] Open
Abstract
A new method for high-resolution quantitative measurement of the dielectric function by using scattering scanning near-field optical microscopy (s-SNOM) is presented. The method is based on a calibration procedure that uses the s-SNOM oscillating dipole model of the probe-sample interaction and quantitative s-SNOM measurements. The nanoscale capabilities of the method have the potential to enable novel applications in various fields such as nano-electronics, nano-photonics, biology or medicine.
Collapse
Affiliation(s)
- D E Tranca
- Center for Microscopy - Microanalysis and Information Processing, University Politehnica of Bucharest
| | - S G Stanciu
- Center for Microscopy - Microanalysis and Information Processing, University Politehnica of Bucharest
| | - R Hristu
- Center for Microscopy - Microanalysis and Information Processing, University Politehnica of Bucharest
| | - C Stoichita
- Center for Microscopy - Microanalysis and Information Processing, University Politehnica of Bucharest
| | - S A M Tofail
- Department of Physics and Energy, University of Limerick
| | - G A Stanciu
- Center for Microscopy - Microanalysis and Information Processing, University Politehnica of Bucharest
| |
Collapse
|
19
|
Bilcu M, Grumezescu AM, Oprea AE, Popescu RC, Mogoșanu GD, Hristu R, Stanciu GA, Mihailescu DF, Lazar V, Bezirtzoglou E, Chifiriuc MC. Efficiency of vanilla, patchouli and ylang ylang essential oils stabilized by iron oxide@C14 nanostructures against bacterial adherence and biofilms formed by Staphylococcus aureus and Klebsiella pneumoniae clinical strains. Molecules 2014; 19:17943-56. [PMID: 25375335 PMCID: PMC6271200 DOI: 10.3390/molecules191117943] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2014] [Revised: 10/22/2014] [Accepted: 10/29/2014] [Indexed: 12/11/2022] Open
Abstract
Biofilms formed by bacterial cells are associated with drastically enhanced resistance against most antimicrobial agents, contributing to the persistence and chronicization of the microbial infections and to therapy failure. The purpose of this study was to combine the unique properties of magnetic nanoparticles with the antimicrobial activity of three essential oils to obtain novel nanobiosystems that could be used as coatings for catheter pieces with an improved resistance to Staphylococcus aureus and Klebsiella pneumoniae clinical strains adherence and biofilm development. The essential oils of ylang ylang, patchouli and vanilla were stabilized by the interaction with iron oxide@C14 nanoparticles to be further used as coating agents for medical surfaces. Iron oxide@C14 was prepared by co-precipitation of Fe+2 and Fe+3 and myristic acid (C14) in basic medium. Vanilla essential oil loaded nanoparticles pelliculised on the catheter samples surface strongly inhibited both the initial adherence of S. aureus cells (quantified at 24 h) and the development of the mature biofilm quantified at 48 h. Patchouli and ylang-ylang essential oils inhibited mostly the initial adherence phase of S. aureus biofilm development. In the case of K. pneumoniae, all tested nanosystems exhibited similar efficiency, being active mostly against the adherence K. pneumoniae cells to the tested catheter specimens. The new nanobiosystems based on vanilla, patchouli and ylang-ylang essential oils could be of a great interest for the biomedical field, opening new directions for the design of film-coated surfaces with anti-adherence and anti-biofilm properties.
Collapse
Affiliation(s)
- Maxim Bilcu
- Microbiology Department, Faculty of Biology, Research Institute of the University of Bucharest, University of Bucharest, Aleea Portocalelor No. 1-3, 060101 Bucharest, Romania.
| | - Alexandru Mihai Grumezescu
- Department of Science and Engineering of Oxide Materials and Nanomaterials, Faculty of Applied Chemistry and Materials Science, University Politehnica of Bucharest, Polizu Street No. 1-7, 011061 Bucharest, Romania.
| | - Alexandra Elena Oprea
- Department of Science and Engineering of Oxide Materials and Nanomaterials, Faculty of Applied Chemistry and Materials Science, University Politehnica of Bucharest, Polizu Street No. 1-7, 011061 Bucharest, Romania.
| | - Roxana Cristina Popescu
- Department of Science and Engineering of Oxide Materials and Nanomaterials, Faculty of Applied Chemistry and Materials Science, University Politehnica of Bucharest, Polizu Street No. 1-7, 011061 Bucharest, Romania.
| | - George Dan Mogoșanu
- Department of Pharmacognosy & Phytotherapy, Faculty of Pharmacy, University of Medicine and Pharmacy of Craiova, 2 Petru Rareş Street, 200349 Craiova, Romania.
| | - Radu Hristu
- Center for Microscopy-Microanalysis and Information Processing, University Politehnica of Bucharest, 313 Splaiul Independentei, 060042 Bucharest, Romania.
| | - George A Stanciu
- Center for Microscopy-Microanalysis and Information Processing, University Politehnica of Bucharest, 313 Splaiul Independentei, 060042 Bucharest, Romania.
| | - Dan Florin Mihailescu
- Microbiology Department, Faculty of Biology, Research Institute of the University of Bucharest, University of Bucharest, Aleea Portocalelor No. 1-3, 060101 Bucharest, Romania.
| | - Veronica Lazar
- Microbiology Department, Faculty of Biology, Research Institute of the University of Bucharest, University of Bucharest, Aleea Portocalelor No. 1-3, 060101 Bucharest, Romania.
| | - Eugenia Bezirtzoglou
- Laboratory of Microbiology, Biotechnology and Hygiene, Department of Food Science and Technology, Faculty of Agricultural Development, Democritus University of Thrace, 68200 Orestiada, Greece.
| | - Mariana Carmen Chifiriuc
- Microbiology Department, Faculty of Biology, Research Institute of the University of Bucharest, University of Bucharest, Aleea Portocalelor No. 1-3, 060101 Bucharest, Romania.
| |
Collapse
|
20
|
Hristu R, Tranca DE, Stanciu SG, Gregor M, Plecenik T, Truchly M, Roch T, Tofail SAM, Stanciu GA. Surface charge and carbon contamination on an electron-beam-irradiated hydroxyapatite thin film investigated by photoluminescence and phase imaging in atomic force microscopy. Microsc Microanal 2014; 20:586-595. [PMID: 24717172 DOI: 10.1017/s1431927614000191] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The surface properties of hydroxyapatite, including electric charge, can influence the biological response, tissue compatibility, and adhesion of biological cells and biomolecules. Results reported here help in understanding this influence by creating charged domains on hydroxyapatite thin films deposited on silicon using electron beam irradiation and investigating their shape, properties, and carbon contamination for different doses of incident injected charge by two methods. Photoluminescence laser scanning microscopy was used to image electrostatic charge trapped at pre-existing and irradiation-induced defects within these domains, while phase imaging in atomic force microscopy was used to image the carbon contamination. Scanning Auger electron spectroscopy and Kelvin probe force microscopy were used as a reference for the atomic force microscopy phase contrast and photoluminescence laser scanning microscopy measurements. Our experiment shows that by combining the two imaging techniques the effects of trapped charge and carbon contamination can be separated. Such separation yields new possibilities for advancing the current understanding of how surface charge influences mediation of cellular and protein interactions in biomaterials.
Collapse
Affiliation(s)
- Radu Hristu
- 1 Center for Microscopy-Microanalysis and Information Processing, University Politehnica of Bucharest, 313 Splaiul Independentei, 060042 Bucharest, Romania
| | - Denis E Tranca
- 1 Center for Microscopy-Microanalysis and Information Processing, University Politehnica of Bucharest, 313 Splaiul Independentei, 060042 Bucharest, Romania
| | - Stefan G Stanciu
- 1 Center for Microscopy-Microanalysis and Information Processing, University Politehnica of Bucharest, 313 Splaiul Independentei, 060042 Bucharest, Romania
| | - Maros Gregor
- 2 Department of Experimental Physics, Faculty of Mathematics, Physics and Informatics, Comenius University, 842 48 Bratislava, Slovakia
| | - Tomas Plecenik
- 2 Department of Experimental Physics, Faculty of Mathematics, Physics and Informatics, Comenius University, 842 48 Bratislava, Slovakia
| | - Martin Truchly
- 2 Department of Experimental Physics, Faculty of Mathematics, Physics and Informatics, Comenius University, 842 48 Bratislava, Slovakia
| | - Tomas Roch
- 2 Department of Experimental Physics, Faculty of Mathematics, Physics and Informatics, Comenius University, 842 48 Bratislava, Slovakia
| | - Syed A M Tofail
- 3 Materials and Surface Science Institute, University of Limerick, Limerick, Ireland
| | - George A Stanciu
- 1 Center for Microscopy-Microanalysis and Information Processing, University Politehnica of Bucharest, 313 Splaiul Independentei, 060042 Bucharest, Romania
| |
Collapse
|
21
|
Tranca DE, Stoichita C, Hristu R, Stanciu SG, Stanciu GA. A study on the image contrast of pseudo-heterodyned scattering scanning near-field optical microscopy. Opt Express 2014; 22:1687-1696. [PMID: 24515176 DOI: 10.1364/oe.22.001687] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The dependence of the near-field signal on the dielectric function of a specific material proposes scattering-type near-field optical microscopy (s-SNOM) as a viable tool for material characterization studies. Our experiment shows that specific material identification by s-SNOM is not a straightforward task as parameters involved in the detection scheme can also influence material contrast measurements. More precisely, we demonstrate that s-SNOM contrast in a pseudo-heterodyne detection configuration depends on the oscillation amplitude of the reference mirror and that for reliable measurements of the contrast between different materials this aspect needs to be taken into consideration.
Collapse
|
22
|
Chifiriuc MC, Grumezescu AM, Saviuc C, Hristu R, Grumezescu V, Bleotu C, Stanciu G, Mihaiescu DE, Andronescu E, Lazar V, Radulescu R. Magnetic Nanoparticles for Controlling in vitro Fungal Biofilms. CURR ORG CHEM 2013. [DOI: 10.2174/1385272811317100004] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
|
23
|
Grumezescu AM, Chifiriuc MC, Saviuc C, Grumezescu V, Hristu R, Mihaiescu DE, Stanciu GA, Andronescu E. Hybrid nanomaterial for stabilizing the antibiofilm activity of Eugenia carryophyllata essential oil. IEEE Trans Nanobioscience 2012; 11:360-5. [PMID: 22949098 DOI: 10.1109/tnb.2012.2208474] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The aim of the present study was to demonstrate that Fe(3)O(4)/oleic acid core/shell nanostructures could be used as systems for stabilizing the Eugenia carryophyllata essential oil (EO) on catheter surface pellicles, in order to improve their resistance to fungal colonization. EO microwave assisted extraction was performed in a Neo-Clevenger (related) device and its chemical composition was settled by GC-MS analysis. Fe(3)O(4)/oleic acid-core/shell nanoparticles (NP) were obtained by a precipitation method under microwave condition. High resolution transmission electron microscopy (HR-TEM) was used as a primary characterization method. The NPs were processed to achieve a core/shell/EO coated-shell nanosystem further used for coating the inner surface of central venous catheter samples. The tested fungal strains have been recently isolated from different clinical specimens. The biofilm architecture was assessed by confocal laser scanning microscopy (CLSM). Our results claim the usage of hybrid nanomaterial (core/shell/coated-shell) for the stabilization of E. carryophyllata EO, which prevented or inhibited the fungal biofilm development on the functionalized catheter, highlighting the opportunity of using these nanosystems to obtain improved, anti-biofilm coatings for biomedical applications.
Collapse
Affiliation(s)
- Alexandru Mihai Grumezescu
- Department of Science and Engineering of Oxidic Materials and Nanomaterials, University Politehnica of Bucharest, Bucharest, 011061, Romania.
| | | | | | | | | | | | | | | |
Collapse
|
24
|
Hristu R, Stanciu SG, Stanciu GA, Çapan İ, Güner B, Erdoğan M. Influence of atomic force microscopy acquisition parameters on thin film roughness analysis. Microsc Res Tech 2012; 75:921-7. [DOI: 10.1002/jemt.22014] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2011] [Accepted: 12/15/2011] [Indexed: 11/09/2022]
|
25
|
Grumezescu AM, Saviuc C, Chifiriuc MC, Hristu R, Mihaiescu DE, Balaure P, Stanciu G, Lazar V. Inhibitory activity of Fe(3) O(4)/oleic acid/usnic acid-core/shell/extra-shell nanofluid on S. aureus biofilm development. IEEE Trans Nanobioscience 2011; 10:269-74. [PMID: 22157076 DOI: 10.1109/tnb.2011.2178263] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Undesired biofilm development is a major concern in many areas, especially in the medical field. The purpose of the present study was to comparatively investigate the antibiofilm efficacy of usnic acid, in soluble versus nanofluid formulation, in order to highlight the potential use of Fe(3) O(4)/oleic acid (FeOA) nanofluid as potential controlled release vehicle of this antibiofilm agent. The (+) -UA loaded into nanofluid exhibited an improved antibiofilm effect on S. aureus biofilm formation, revealed by the drastic decrease of the viable cell counts as well as by confocal laser scanning microscopy images. Our results demonstrate that FeOA nanoparticles could be used as successful coating agents for obtaining antibiofilm pellicles on different medical devices, opening a new perspective for obtaining new antimicrobial and antibiofilm surfaces, based on hybrid functionalized nanostructured biomaterials.
Collapse
Affiliation(s)
- Alexandru Mihai Grumezescu
- Science and Engineering of Oxidic Materialsand Nanomaterials, University Politehnica of Bucharest, Romania.
| | | | | | | | | | | | | | | |
Collapse
|
26
|
Stanciu SG, Hristu R, Stanciu GA. Digital image inpainting and microscopy imaging. Microsc Res Tech 2011; 74:1049-57. [DOI: 10.1002/jemt.20993] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2010] [Accepted: 01/07/2011] [Indexed: 11/05/2022]
|
27
|
Stanciu SG, Hristu R, Boriga R, Stanciu GA. On the suitability of SIFT technique to deal with image modifications specific to confocal scanning laser microscopy. Microsc Microanal 2010; 16:515-530. [PMID: 20684799 DOI: 10.1017/s1431927610000371] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Computer vision tasks such as recognition and classification of objects and structures or image registration and retrieval can provide significant information when applied to microscopy images. Recently developed techniques for the detection and description of local features make the extraction and description of local image features that are invariant to various changes possible. The invariance and robustness of feature detection and description techniques play a key role in the design and implementation of object recognition, image registration, or image mosaicing applications. The scale-invariant feature transform (SIFT) technique is a widely used method for the detection, description, and matching of image features. In this article we present the results of our experiments regarding the repeatability of SIFT features, and to the precision of the SIFT feature matching, under image modifications specific to confocal scanning laser microscopy (CSLM). We have analyzed the behavior of SIFT while changing the pinhole aperture, photomultiplier gain, laser beam power, and electronic zoom. Our experiments, conducted on CSLM images, show that the SIFT technique is able to match detected key points between images acquired at different values of the acquisition parameters with good precision and represents a consistent tool for computer vision applications in CSLM.
Collapse
Affiliation(s)
- Stefan G Stanciu
- Center for Microscopy - Microanalysis and Information Processing, University Politehnica Bucharest, Splaiul Independentei 313, Sector 6, Bucharest, Romania
| | | | | | | |
Collapse
|
28
|
Saviuc C, Dascălu L, Chifiriuc MC, Rădulescu V, Oprea E, Popa M, Hristu R, Stanciu G, Lazăr V. The inhibitory activity of pomelo essential oil on the bacterial biofilms development on soft contact lenses. Roum Arch Microbiol Immunol 2010; 69:145-152. [PMID: 21434591] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The aim of present study was to investigate the microbial colonization of worn contact lenses (CLs) and to evaluate the inhibitory effect of pomelo (Citrus maxima) peels essential oil on the biofilm development on unworn CLs. The essential oil was isolated by steam distillation and analyzed by gas chromatography coupled with mass spectrometry, twenty compounds being isolated. The antimicrobial activity of pomelo oil was tested against S. epidermidis and P. aeruginosa strains, known for their ability to develop biofilms on prosthetic devices, by qualitative screening methods and quantitative assay of the minimal inhibitory concentrations (MIC) in order to evaluate the antibiofilm activity. Our study revealed that all worn CLs where 100% colonized by staphylococci and Enterobacteriaceae strains. The pomelo essential oil inhibited the development of bacterial biofilms formed by Gram-positive and Gram-negative microorganisms on soft CLs, its antibiofilm activity being specific and dependent on different physical parameters (contact time and temperature). The architecture of bacterial biofilms developed on soft contact lenses was analyzed using confocal scanning laser microscopy (CSLM).
Collapse
Affiliation(s)
- Crina Saviuc
- University of Bucharest, Faculty of Biology, Microbiology Department, Ale. Portocalelor 1-3, 77206, Bucharest, Romania.
| | | | | | | | | | | | | | | | | |
Collapse
|