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Huang W, Hua MZ, Li S, Chen K, Lu X, Wu D. Application of atomic force microscopy in the characterization of fruits and vegetables and associated substances toward improvement in quality, preservation, and processing: nanoscale structure and mechanics perspectives. Crit Rev Food Sci Nutr 2023:1-29. [PMID: 37585698 DOI: 10.1080/10408398.2023.2242944] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/18/2023]
Abstract
Fruits and vegetables are essential horticultural crops for humans. The quality of fruits and vegetables is critical in determining their nutritional value and edibility, which are decisive to their commercial value. Besides, it is also important to understand the changes in key substances involved in the preservation and processing of fruits and vegetables. Atomic force microscopy (AFM), a powerful technique for investigating biological surfaces, has been widely used to characterize the quality of fruits and vegetables and the substances involved in their preservation and processing from the perspective of nanoscale structure and mechanics. This review summarizes the applications of AFM to investigate the texture, appearance, and nutrients of fruits and vegetables based on structural imaging and force measurements. Additionally, the review highlights the application of AFM in characterizing the morphological and mechanical properties of nanomaterials involved in preserving and processing fruits and vegetables, including films and coatings for preservation, bioactive compounds for processing purposes, nanofiltration membrane for concentration, and nanoencapsulation for delivery of bioactive compounds. Furthermore, the strengths and weaknesses of AFM for characterizing the quality of fruits and vegetables and the substances involved in their preservation and processing are examined, followed by a discussion on the prospects of AFM in this field.
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Affiliation(s)
- Weinan Huang
- College of Agriculture and Biotechnology/Zhejiang Provincial Key Laboratory of Horticultural Plant Integrative Biology/Key Laboratory of Ministry of Agriculture and Rural Affairs of Biology and Genetic Improvement of Horticultural Crops (Growth and Development), Zhejiang University, Hangzhou, P. R. China
- Zhongyuan Institute, Zhejiang University, Zhengzhou, P. R. China
| | - Marti Z Hua
- Department of Food Science and Agricultural Chemistry, McGill University, Quebec, Canada
| | - Shenmiao Li
- Department of Food Science and Agricultural Chemistry, McGill University, Quebec, Canada
| | - Kunsong Chen
- College of Agriculture and Biotechnology/Zhejiang Provincial Key Laboratory of Horticultural Plant Integrative Biology/Key Laboratory of Ministry of Agriculture and Rural Affairs of Biology and Genetic Improvement of Horticultural Crops (Growth and Development), Zhejiang University, Hangzhou, P. R. China
- Zhongyuan Institute, Zhejiang University, Zhengzhou, P. R. China
| | - Xiaonan Lu
- Department of Food Science and Agricultural Chemistry, McGill University, Quebec, Canada
| | - Di Wu
- College of Agriculture and Biotechnology/Zhejiang Provincial Key Laboratory of Horticultural Plant Integrative Biology/Key Laboratory of Ministry of Agriculture and Rural Affairs of Biology and Genetic Improvement of Horticultural Crops (Growth and Development), Zhejiang University, Hangzhou, P. R. China
- Zhongyuan Institute, Zhejiang University, Zhengzhou, P. R. China
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2
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Xu Z, Li Q, Huang Y, Guo K, Xue B, Cao Y, Li Y. Blocking Nonspecific Interactions Using Y-Shape Poly(ethylene glycol). Int J Mol Sci 2023; 24:12414. [PMID: 37569789 PMCID: PMC10419274 DOI: 10.3390/ijms241512414] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2023] [Revised: 07/27/2023] [Accepted: 07/31/2023] [Indexed: 08/13/2023] Open
Abstract
Nonspecific interactions play a significant role in physiological activities, surface chemical modification, and artificial adhesives. However, nonspecificity sometimes causes sticky problems, including surface fouling, decreased target specificity, and artifacts in single-molecule measurements. Adjusting the liquid pH, using protein-blocking additives, adding nonionic surfactants, or increasing the salt concentration are common methods to minimize nonspecific binding to achieve high-quality data. Here, we report that grafting heteromorphic polyethylene glycol (Y-shape PEG) with two inert terminates could noticeably decrease nonspecific binding. As a proof-of-concept, we performed single-molecule force spectroscopy and fluorescence staining imaging experiments to verify the feasibility of Y-shape PEG in blocking nonspecific interactions. Our results indicate that Y-shape PEG could serve as a prominent and efficient candidate to minimize nonspecificity for scientific and biomedical applications.
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Affiliation(s)
- Zhengyu Xu
- Collaborative Innovation Center of Advanced Microstructures, National Laboratory of Solid State Microstructure, Department of Physics, Nanjing University, Nanjing 210093, China; (Z.X.); (Q.L.); (Y.H.); (K.G.); (B.X.)
- Jinan Microecological Biomedicine Shandong Laboratory, Jinan 250021, China
| | - Qingtai Li
- Collaborative Innovation Center of Advanced Microstructures, National Laboratory of Solid State Microstructure, Department of Physics, Nanjing University, Nanjing 210093, China; (Z.X.); (Q.L.); (Y.H.); (K.G.); (B.X.)
| | - Yaying Huang
- Collaborative Innovation Center of Advanced Microstructures, National Laboratory of Solid State Microstructure, Department of Physics, Nanjing University, Nanjing 210093, China; (Z.X.); (Q.L.); (Y.H.); (K.G.); (B.X.)
- Jinan Microecological Biomedicine Shandong Laboratory, Jinan 250021, China
| | - Kaiqiang Guo
- Collaborative Innovation Center of Advanced Microstructures, National Laboratory of Solid State Microstructure, Department of Physics, Nanjing University, Nanjing 210093, China; (Z.X.); (Q.L.); (Y.H.); (K.G.); (B.X.)
| | - Bin Xue
- Collaborative Innovation Center of Advanced Microstructures, National Laboratory of Solid State Microstructure, Department of Physics, Nanjing University, Nanjing 210093, China; (Z.X.); (Q.L.); (Y.H.); (K.G.); (B.X.)
- Jinan Microecological Biomedicine Shandong Laboratory, Jinan 250021, China
| | - Yi Cao
- Collaborative Innovation Center of Advanced Microstructures, National Laboratory of Solid State Microstructure, Department of Physics, Nanjing University, Nanjing 210093, China; (Z.X.); (Q.L.); (Y.H.); (K.G.); (B.X.)
- Jinan Microecological Biomedicine Shandong Laboratory, Jinan 250021, China
| | - Yiran Li
- Collaborative Innovation Center of Advanced Microstructures, National Laboratory of Solid State Microstructure, Department of Physics, Nanjing University, Nanjing 210093, China; (Z.X.); (Q.L.); (Y.H.); (K.G.); (B.X.)
- Medical School, Nanjing University, Nanjing 210093, China
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3
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Ordóñez C, Martínez-Zapata D, Santamaria R. Dissociation of the Watson-Crick base pairs in vacuum and in aqueous solution: a first-principles molecular dynamics study. J Biomol Struct Dyn 2022; 40:13207-13217. [PMID: 34629032 DOI: 10.1080/07391102.2021.1987988] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The damage of the DNA structure can affect the correct functioning of the cellular processes. This work investigates the required forces to dissociate the Watson-Crick (WC) base pairs AT into A and T, and GC into G and C. The WC base pairs are immersed in water under realistic conditions of temperature, volume, and density that reproduce the main characteristics of a biological system. The simulations are based on first-principles molecular dynamics combined with steering atomic forces. In addition to the force intensities, the charge transfers between the nucleic acid bases, energy variations, and temperature fluctuations in the cleavage moments are reported. With the purpose of evaluating the effects of the aqueous medium, simulations of the WC base pairs in vacuum are included. The results considering the solvated medium are consistent with the experimental measurements, and show the importance of the aqueous solution to regulate the structural modifications of the nucleic acid bases. The investigation contributes with a novel molecular model in molecular simulations, and to better understand the biological processes where the DNA compounds play an active role in life forms.Communicated by Ramaswamy H. Sarma.
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Affiliation(s)
- Cristian Ordóñez
- Department of Theoretical Physics, Institute of Physics, Universidad Nacional Autónoma de México, Ciudad de México, México
| | - Daniel Martínez-Zapata
- Department of Theoretical Physics, Institute of Physics, Universidad Nacional Autónoma de México, Ciudad de México, México
| | - Ruben Santamaria
- Department of Theoretical Physics, Institute of Physics, Universidad Nacional Autónoma de México, Ciudad de México, México
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Han LT, Sun GG, Ruan LS, Li X. Structured Aptamers: A Flourishing Nanomaterial for Tumor Targeting. J Biomed Nanotechnol 2022. [DOI: 10.1166/jbn.2022.3407] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Structured aptamers are nucleic acid systems produced using DNA nano self-assembly technology and can be constructed in a programmable manner. These aptamers are widely used in biomedical fields because of their low biological toxicity, weak immunogenicity, good cytocompatibility and
biocompatibility, stability, and facile modification ability. Additionally, structured aptamers achieve nano precision in spatial configuration and can be directly internalized into targets without the assistance of transfection reagents. They exhibit higher stability, rigidity, and binding
efficiency than aptamers alone. Therefore, structured aptamers have been universally applied in the tumor-targeting field and have emerged as a current research hotspot. Here, we introduce the assembly principle, assembly methods, and characterization methods of structured aptamers. Moreover,
the application status of structured aptamers for tumor detection and targeted therapy is summarized to provide new research directions for early diagnosis and drug research in the field of oncology.
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Affiliation(s)
- Li-Ting Han
- Department of Gynaecology 2, Renmin Hospital of Wuhan University, Wuhan, 430060, China
| | - Ge-Ge Sun
- Department of Gynaecology 2, Renmin Hospital of Wuhan University, Wuhan, 430060, China
| | - Luo-Shan Ruan
- Department of Gynaecology 2, Renmin Hospital of Wuhan University, Wuhan, 430060, China
| | - Xin Li
- Department of Gynaecology 2, Renmin Hospital of Wuhan University, Wuhan, 430060, China
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Abstract
![]()
We
explore the process of base-flipping for four central bases,
adenine, guanine, cytosine, and thymine, in a deoxyribonucleic acid
(DNA) duplex using the energy landscape perspective. NMR imino-proton
exchange and fluorescence correlation spectroscopy studies have been
used in previous experiments to obtain lifetimes for bases in paired
and extrahelical states. However, the difference of almost 4 orders
of magnitude in the base-flipping rates obtained by the two methods
implies that they are exploring different pathways and possibly different
open states. Our results support the previous suggestion that minor
groove opening may be favored by distortions in the DNA backbone and
reveal links between sequence effects and the direction of opening,
i.e., whether the base flips toward the major or the minor groove
side. In particular, base flipping along the minor groove pathway
was found to align toward the 5′ side of the backbone. We find
that bases align toward the 3′ side of the backbone when flipping
along the major groove pathway. However, in some cases for cytosine
and thymine, the base flipping along the major groove pathway also
aligns toward the 5′ side. The sequence effect may be caused
by the polar interactions between the flipping-base and its neighboring
bases on either of the strands. For guanine flipping toward the minor
groove side, we find that the equilibrium constant for opening is
large compared to flipping via the major groove. We find that the
estimated rates of base opening, and hence the lifetimes of the closed
state, obtained for thymine flipping through small and large angles
along the major groove differ by 6 orders of magnitude, whereas for
thymine flipping through small angles along the minor groove and large
angles along the major groove, the rates differ by 3 orders of magnitude.
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Affiliation(s)
- Nicy
- Yusuf Hamied Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, U.K
| | - Debayan Chakraborty
- Department of Chemistry, The University of Texas at Austin, Austin, Texas 78712, United States
| | - David J. Wales
- Yusuf Hamied Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, U.K
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Willaert RG, Kasas S. High-Speed Atomic Force Microscopy Visualization of Protein-DNA Interactions Using DNA Origami Frames. Methods Mol Biol 2022; 2516:157-167. [PMID: 35922627 DOI: 10.1007/978-1-0716-2413-5_10] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Direct, live imaging of protein-DNA interactions under physiological conditions is invaluable for understanding the mechanism and kinetics of binding and understanding the topological changes of the DNA strand. The DNA origami technology allows for precise placement of target molecules in a designed nanostructure. Here, we describe a protocol for the self-assembly of DNA origami frames with 2 stretched DNA sequences containing the binding site of a transcription factor, i.e., the Protein FadR, which is a TetR-family tanscription factor regulator for fatty acid metabolism in the archaeal organism Sulfolobus acidocaldarius. These frames can be used to study the dynamics of transcription factor binding using high-speed AFM and obtain mechanistic insights into the mechanism of action of transcription factors.
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Affiliation(s)
- Ronnie G Willaert
- Research Group Structural Biology Brussels, Alliance Research Group VUB-UGent NanoMicrobiology (NAMI), Brussels, Belgium.
- International Joint Research Group VUB-EPFL BioNanotechnology & NanoMedicine, Brussels, Belgium.
| | - Sandor Kasas
- International Joint Research Group VUB-EPFL BioNanotechnology & NanoMedicine, Brussels, Belgium
- Laboratory of Biological Electron Microscopy, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
- Centre Universitaire Romand de Médecine Légale, UFAM, Université de Lausanne, Lausanne, Switzerland
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Sethi S, Sugiyama H, Endo M. Biomimetic DNA Nanotechnology to Understand and Control Cellular Responses. Chembiochem 2021; 23:e202100446. [PMID: 34664334 DOI: 10.1002/cbic.202100446] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2021] [Revised: 10/12/2021] [Indexed: 12/15/2022]
Abstract
At the cellular level, numerous nanocues guide the cells to adhere, interact, proliferate, differentiate, etc. Understanding and manipulating the cellular functions in vitro, necessitates the elucidation of these nanocues provided to the cells by the extracellular matrix (ECM), neighbouring cells or in the form of ligands. DNA nanotechnology is a biocompatible, flexible and a promising molecular level toolkit for mimicking cell-cell and cell-matrix interactions. In this review, we summarize various advances in cell-matrix, cell-cell and cell receptor-ligand interactions using DNA nanotechnology as a tool. We also provide a brief outlook on the current challenges and the future potentials of these DNA-based nanostructures so as to inspire novel innovations in the field.
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Affiliation(s)
- Soumya Sethi
- Department of Chemistry, Graduate School of Science, Kyoto University, Yoshida-ushinomiyacho, Sakyo-ku, Kyoto, 606-8501, Japan
| | - Hiroshi Sugiyama
- Department of Chemistry, Graduate School of Science, Kyoto University, Yoshida-ushinomiyacho, Sakyo-ku, Kyoto, 606-8501, Japan.,Institute for Integrated Cell-Material Sciences, Kyoto University, Yoshida-ushinomiyacho, Sakyo-ku, Kyoto, 606-8501, Japan
| | - Masayuki Endo
- Department of Chemistry, Graduate School of Science, Kyoto University, Yoshida-ushinomiyacho, Sakyo-ku, Kyoto, 606-8501, Japan.,Institute for Integrated Cell-Material Sciences, Kyoto University, Yoshida-ushinomiyacho, Sakyo-ku, Kyoto, 606-8501, Japan.,Organization for Research and Development of Innovative Science and Technology, Kansai University, Suita, Osaka, 564-8680, Japan
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8
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Fu S, Zhang T, Jiang H, Xu Y, Chen J, Zhang L, Su X. DNA nanotechnology enhanced single-molecule biosensing and imaging. Trends Analyt Chem 2021. [DOI: 10.1016/j.trac.2021.116267] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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9
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Takahashi S, Oshige M, Katsura S. DNA Manipulation and Single-Molecule Imaging. Molecules 2021; 26:1050. [PMID: 33671359 PMCID: PMC7922115 DOI: 10.3390/molecules26041050] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2020] [Revised: 02/12/2021] [Accepted: 02/14/2021] [Indexed: 11/22/2022] Open
Abstract
DNA replication, repair, and recombination in the cell play a significant role in the regulation of the inheritance, maintenance, and transfer of genetic information. To elucidate the biomolecular mechanism in the cell, some molecular models of DNA replication, repair, and recombination have been proposed. These biological studies have been conducted using bulk assays, such as gel electrophoresis. Because in bulk assays, several millions of biomolecules are subjected to analysis, the results of the biological analysis only reveal the average behavior of a large number of biomolecules. Therefore, revealing the elementary biological processes of a protein acting on DNA (e.g., the binding of protein to DNA, DNA synthesis, the pause of DNA synthesis, and the release of protein from DNA) is difficult. Single-molecule imaging allows the analysis of the dynamic behaviors of individual biomolecules that are hidden during bulk experiments. Thus, the methods for single-molecule imaging have provided new insights into almost all of the aspects of the elementary processes of DNA replication, repair, and recombination. However, in an aqueous solution, DNA molecules are in a randomly coiled state. Thus, the manipulation of the physical form of the single DNA molecules is important. In this review, we provide an overview of the unique studies on DNA manipulation and single-molecule imaging to analyze the dynamic interaction between DNA and protein.
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Affiliation(s)
- Shunsuke Takahashi
- Division of Life Science and Engineering, School of Science and Engineering, Tokyo Denki University, Hatoyama-cho, Hiki-gun, Saitama 350-0394, Japan;
| | - Masahiko Oshige
- Department of Environmental Engineering Science, Graduate School of Science and Technology, Gunma University, Kiryu, Gunma 376-8515, Japan;
- Gunma University Center for Food Science and Wellness (GUCFW), Maebashi, Gunma 371-8510, Japan
| | - Shinji Katsura
- Department of Environmental Engineering Science, Graduate School of Science and Technology, Gunma University, Kiryu, Gunma 376-8515, Japan;
- Gunma University Center for Food Science and Wellness (GUCFW), Maebashi, Gunma 371-8510, Japan
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Barrabés S, Ng-Choi I, Martínez MÁ, Manzano BR, Jalón FA, Espino G, Feliu L, Planas M, de Llorens R, Massaguer A. A nucleus-directed bombesin derivative for targeted delivery of metallodrugs to cancer cells. J Inorg Biochem 2020; 212:111214. [PMID: 32919249 DOI: 10.1016/j.jinorgbio.2020.111214] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2020] [Revised: 07/30/2020] [Accepted: 07/31/2020] [Indexed: 11/19/2022]
Abstract
We have synthesized a set of bombesin derivatives with the aim of exploring their tumor targeting properties to deliver metal-based chemotherapeutics into cancer cells. Peptide QRLGNQWAVGHLL-NH2 (BN3) was selected based on its high internalization in gastrin-releasing peptide receptor (GRPR)-overexpressing PC-3 cells. Three metallopeptides were prepared by incorporating the terpyridine Pt(II) complex [PtCl(cptpy)]Cl (1) (cptpy = 4'-(4-carboxyphenyl)-2,2':6,2″-terpyridine) at the N-terminus of BN3 or at the NƐ- or Nα-amino group of an additional Lys residue (1-BN3, Lys-1-BN3 and 1-Lys-BN3, respectively). 1-Lys-BN3 displayed the best cytotoxic activity (IC50: 19.2 ± 1.7 μM) and similar ability to intercalate into DNA than complex 1. Moreover, the polypyridine Ru(II) complex [Ru(bpy)2)(cmbpy)](PF6)2 (2) (bpy = 2,2'-bipyridine; cmbpy = 4-methyl-2,2'-bipyridine-4'-carboxylic acid), with proven activity as photosensitizer, was coupled to BN3 leading to metallopeptide 2-Lys-BN3. Upon photoactivation, 2-Lys-BN3 displayed 2.5-fold higher cytotoxicity against PC-3 cells (IC50: 7.6 ± 1.0 μM) than complex 2. To enhance the accumulation of the drugs into the cell nucleus, the nuclear localization signal (NLS) PKKKRKV was incorporated at the N-terminus of BN3. NLS-BN3 displayed higher cellular internalization along with nuclear biodistribution. Accordingly, metallopeptides 1-NLS-BN3 and 2-NLS-BN3 showed increased cytotoxicity (IC50: 12.0 ± 1.1 μM and 2.3 ± 1.1 μM). Interestingly, the phototoxic index of 2-NLS-BN3 was 8-fold higher than that of complex 2. Next, the selectivity towards cancer cells was explored using 1BR3.G fibroblasts. Higher selectivity indexes were obtained for 1-NLS-BN3 and 2-NLS-BN3 than for the unconjugated complexes. These results prove NLS-BN3 effective for targeted delivery of metallodrugs to GRPR-overexpressing cells and for enhancing the cytotoxic efficacy of metal-based photosensitizers.
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Affiliation(s)
- Sílvia Barrabés
- Departament de Biologia, Universitat de Girona, Maria Aurèlia Capmany 40, 17003 Girona, Spain
| | - Iteng Ng-Choi
- Departament de Química, Universitat de Girona, Maria Aurèlia Capmany 69, 17003 Girona, Spain
| | - María Ángeles Martínez
- Departament de Química, Universitat de Girona, Maria Aurèlia Capmany 69, 17003 Girona, Spain.
| | - Blanca R Manzano
- Universidad de Castilla-La Mancha, Facultad de Ciencias y Tecnologías Químicas-IRICA, Avda. Camilo J. Cela 10, 13071 Ciudad Real, Spain
| | - Félix A Jalón
- Universidad de Castilla-La Mancha, Facultad de Ciencias y Tecnologías Químicas-IRICA, Avda. Camilo J. Cela 10, 13071 Ciudad Real, Spain
| | - Gustavo Espino
- Departamento de Química, Universidad de Burgos, Pza. Misael Bañuelos s/n, 09001 Burgos, Spain
| | - Lidia Feliu
- Departament de Química, Universitat de Girona, Maria Aurèlia Capmany 69, 17003 Girona, Spain.
| | - Marta Planas
- Departament de Química, Universitat de Girona, Maria Aurèlia Capmany 69, 17003 Girona, Spain.
| | - Rafael de Llorens
- Departament de Biologia, Universitat de Girona, Maria Aurèlia Capmany 40, 17003 Girona, Spain
| | - Anna Massaguer
- Departament de Biologia, Universitat de Girona, Maria Aurèlia Capmany 40, 17003 Girona, Spain.
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11
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Lavelle C, Tardin C. Single molecule approaches of nucleic acids conformational changes. Methods 2019; 169:1-2. [PMID: 31518659 DOI: 10.1016/j.ymeth.2019.09.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022] Open
Affiliation(s)
- Christophe Lavelle
- National Museum of Natural History, CNRS, UMR7196 / INSERM U1164, 75005 Paris, France.
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