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Casado S, Varela-Miguéns M, de Oliveira Diz T, Quintela-Vilariño C, Nogueiras R, Diéguez C, Tovar S. The effects of ghrelin and LEAP-2 in energy homeostasis are modulated by thermoneutrality, high-fat diet and aging. J Endocrinol Invest 2024:10.1007/s40618-024-02307-4. [PMID: 38337094 DOI: 10.1007/s40618-024-02307-4] [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] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/28/2023] [Accepted: 01/09/2024] [Indexed: 02/12/2024]
Abstract
PURPOSE Liver-expressed antimicrobial peptide 2 (LEAP-2) has been recently identified as the endogenous non-competitive allosteric antagonist of the growth hormone secretagogue receptor 1a (GHSR1a). In rodents, LEAP-2 blunts ghrelin-induced feeding and its plasma levels are modulated in response to nutritional status, being decreased upon fasting and increased in high-fat diet (HFD) fed mice. Clinical data support the regulation of circulating LEAP-2 by nutrient availability in humans. In this work, our primary objective was to examine the chronic effects of ghrelin and LEAP-2 administration on food intake, adiposity, and energy expenditure in young mice subjected to standard and HFD at both room temperature and at thermoneutrality. Furthermore, we aimed to assess the impact of these two hormones on aging mice. RESULTS Our results indicate that LEAP-2 produces a significant decrease of body weight and adiposity, an increase in energy expenditure, and activation of the thermogenic program in white and brown adipose tissue depots. However, this effect is not maintained under HFD or under thermoneutral conditions and is only partially observed in aging mice. CONCLUSION In summary our studies describe the central effects of LEAP-2 within distinct experimental contexts, and contribute to the comprehension of LEAP-2's role in energy metabolism.
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Affiliation(s)
- S Casado
- Departamento de Fisioloxía and Centro de Investigación en Medicina Molecular (CIMUS), Universidade de Santiago de Compostela, Instituto de Investigaciones Sanitarias de Santiago de Compostela (IDIS), 15782, Santiago de Compostela, Spain
| | - M Varela-Miguéns
- Departamento de Fisioloxía and Centro de Investigación en Medicina Molecular (CIMUS), Universidade de Santiago de Compostela, Instituto de Investigaciones Sanitarias de Santiago de Compostela (IDIS), 15782, Santiago de Compostela, Spain
| | - T de Oliveira Diz
- Departamento de Fisioloxía and Centro de Investigación en Medicina Molecular (CIMUS), Universidade de Santiago de Compostela, Instituto de Investigaciones Sanitarias de Santiago de Compostela (IDIS), 15782, Santiago de Compostela, Spain
| | - C Quintela-Vilariño
- Departamento de Fisioloxía and Centro de Investigación en Medicina Molecular (CIMUS), Universidade de Santiago de Compostela, Instituto de Investigaciones Sanitarias de Santiago de Compostela (IDIS), 15782, Santiago de Compostela, Spain
| | - R Nogueiras
- Departamento de Fisioloxía and Centro de Investigación en Medicina Molecular (CIMUS), Universidade de Santiago de Compostela, Instituto de Investigaciones Sanitarias de Santiago de Compostela (IDIS), 15782, Santiago de Compostela, Spain
- CIBER Fisiopatología de la Obesidad y Nutrición (CIBERobn), 28029, Madrid, Spain
| | - C Diéguez
- Departamento de Fisioloxía and Centro de Investigación en Medicina Molecular (CIMUS), Universidade de Santiago de Compostela, Instituto de Investigaciones Sanitarias de Santiago de Compostela (IDIS), 15782, Santiago de Compostela, Spain.
- CIBER Fisiopatología de la Obesidad y Nutrición (CIBERobn), 28029, Madrid, Spain.
| | - S Tovar
- Departamento de Fisioloxía and Centro de Investigación en Medicina Molecular (CIMUS), Universidade de Santiago de Compostela, Instituto de Investigaciones Sanitarias de Santiago de Compostela (IDIS), 15782, Santiago de Compostela, Spain.
- CIBER Fisiopatología de la Obesidad y Nutrición (CIBERobn), 28029, Madrid, Spain.
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Cañones-Zafra R, Gros-Otero J, Garcia-Gonzalez M, Casado S, Ketabi S, Villa-Collar C, Teus MA. Atomic force microscopy for the evaluation of corneal surface roughness after femtosecond laser flap creation and excimer ablation. Int Ophthalmol 2023; 43:4131-4136. [PMID: 37505289 DOI: 10.1007/s10792-023-02821-z] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2021] [Accepted: 07/10/2023] [Indexed: 07/29/2023]
Abstract
INTRODUCTION It is well known that the femtosecond laser lamellar cut induces some degree of surface roughness. Nevertheless, as in femtosecond laser-assisted LASIK (FS-LASIK), an excimer LASIK ablation is performed, and the post-ablation stromal bed should show some degree of smoothening. We decided to compare, using atomic force microscopy (AFM), the roughness of the corneal stromal bed, after a femtosecond lasers device flap was created with or without an excimer myopic ablation. METHODS Using 6 freshly enucleated porcine eyes, we created in every eye a flap using a femtosecond laser. Additionally, in 3 eyes, an excimer laser ablation to correct-3 diopters (D) was made. AFM imaging of the remaining corneal stroma was performed. Ten different square areas of 20 μm x 20 μm at the central area of the stroma of each corneal sample were studied. The roughness parameters used were the root-mean-square deviation from a perfectly flat surface. RESULTS The RMS deviation was 360 ± 120 nm in femtosecond laser only, and 110 ± 20 nm in those cases where excimer is also involved (p < 0.0001). CONCLUSIONS Our results show that the roughness of the surface treated with excimer is clearly lower than in the group with no excimer ablation; thus, the application of laser excimer after a flap created by femtosecond laser seems to soften the nano-irregularities created by this technique.
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Affiliation(s)
- Rafael Cañones-Zafra
- Department of Ophthalmology, Hospital Universitario Príncipe de Asturias, Carretera Alcalá-Meco S/N, 28805, Alcalá de Henares, Madrid, Spain.
- Clínica Novovisión, Madrid, Spain.
| | | | | | | | - Samira Ketabi
- Department of Ophthalmology, Hospital Universitario Príncipe de Asturias, Carretera Alcalá-Meco S/N, 28805, Alcalá de Henares, Madrid, Spain
| | - César Villa-Collar
- Clínica Novovisión, Madrid, Spain
- Department of Pharmacy, Biotechnology, Nutrition, Optics and Optometry, Universidad Europea de, Madrid, Spain
| | - Miguel A Teus
- Department of Ophthalmology, Hospital Universitario Príncipe de Asturias, Carretera Alcalá-Meco S/N, 28805, Alcalá de Henares, Madrid, Spain
- Clínica Novovisión, Madrid, Spain
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Barelli M, Casado S, Cassin F, Pimentel C, Pina C, Giordano MC, Buatier de Mongeot F, Gnecco E. Highly Efficient Sequestration of Aqueous Lead on Nanostructured Calcite Substrates. Nanotechnology 2023. [PMID: 37279698 DOI: 10.1088/1361-6528/acdbd4] [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] [Indexed: 06/08/2023]
Abstract
Following defocused ion beam sputtering, large area highly corrugated and faceted nanoripples are formed on calcite (10.4) faces in a self-organized fashion. High resolution AFM imaging reveals that calcite ripples are defined by facets with highly kinked (11.0) and (2.12) terminations. In situ AFM imaging during the exposure of such modified calcite surfaces to PbCl2 aqueous solution reveals that the nanostructured calcite surface promotes the uptake of Pb. In addition, we observed the progressive smoothing of the highly reactive calcite facet terminations and the formation of Pb-bearing precipitates elongated in registry with the underlying nanopattern. By SEM-EDS analysis we quantified a remarkable 500% increase of the Pb uptake rate, up to 0.5 atomic weight % per hour, on the nanorippled calcite in comparison to its freshly cleaved (10.4) surfaces. These results suggest that nanostructurated calcite surfaces can be used for developing future systems for lead sequestration from polluted waters.
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Affiliation(s)
- Matteo Barelli
- Università degli Studi di Genova Dipartimento di Fisica, Via Dodecaneso 33, Genova, Liguria, 16146, ITALY
| | - Santiago Casado
- Facultad de Ciencia e Ingeniería en Alimentos, Universidad Tecnica de Ambato, Avda. Los Chasquis y río Payamino s/n, Ambato, 108207, ECUADOR
| | - Felix Cassin
- University of Pittsburgh Department of Mechanical Engineering and Materials Science, Benedum Hall #636, Pittsburgh, Pennsylvania, 15261, UNITED STATES
| | - Carlos Pimentel
- Instituto Andaluz de Ciencias de la Tierra, Av. de las Palmeras, 4, Granada, Andalucía, 18002, SPAIN
| | - Carlos Pina
- Universidad Complutense de Madrid Facultad de Ciencias Geologicas, C. de José Antonio Novais, 12, Madrid, Comunidad de Madrid, 28040, SPAIN
| | - Maria Caterina Giordano
- University of Genoa, Physics Department, Via Dodecaneso 33, 16146, Genoa, Italy, Genova, Liguria, 16146, ITALY
| | | | - Enrico Gnecco
- Jagiellonian University in Krakow Faculty of Physics Astronomy and Applied Computer Science, Łojasiewicza 11, Krakow, 30-348, POLAND
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Sevilla ME, Garcia MD, Perez-Castillo Y, Armijos-Jaramillo V, Casado S, Vizuete K, Debut A, Cerda-Mejía L. Degradation of PET Bottles by an Engineered Ideonella sakaiensis PETase. Polymers (Basel) 2023; 15:polym15071779. [PMID: 37050393 PMCID: PMC10098701 DOI: 10.3390/polym15071779] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2023] [Revised: 03/27/2023] [Accepted: 03/28/2023] [Indexed: 04/14/2023] Open
Abstract
Extensive plastic production has become a serious environmental and health problem due to the lack of efficient treatment of plastic waste. Polyethylene terephthalate (PET) is one of the most used polymers and is accumulating in landfills or elsewhere in nature at alarming rates. In recent years, enzymatic degradation of PET by Ideonella sakaiensis PETase (IsPETase), a cutinase-like enzyme, has emerged as a promising strategy to completely depolymerize this polymer into its building blocks. Here, inspired by the architecture of cutinases and lipases homologous to IsPETase and using 3D structure information of the enzyme, we rationally designed three mutations in IsPETase active site for enhancing its PET-degrading activity. In particular, the S238Y mutant, located nearby the catalytic triad, showed a degradation activity increased by 3.3-fold in comparison to the wild-type enzyme. Importantly, this structural modification favoured the function of the enzyme in breaking down highly crystallized (~31%) PET, which is found in commercial soft drink bottles. In addition, microscopical analysis of enzyme-treated PET samples showed that IsPETase acts better when the smooth surface of highly crystalline PET is altered by mechanical stress. These results represent important progress in the accomplishment of a sustainable and complete degradation of PET pollution.
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Affiliation(s)
- Maria Eduarda Sevilla
- Facultad de Ciencia e Ingeniería en Alimentos y Biotecnología, Universidad Técnica de Ambato, Ambato 180216, Ecuador
| | - Mario D Garcia
- Facultad de Ciencia e Ingeniería en Alimentos y Biotecnología, Universidad Técnica de Ambato, Ambato 180216, Ecuador
| | - Yunierkis Perez-Castillo
- Área de Ciencias Aplicadas, Facultad de Ingeniería y Ciencias Aplicadas, Universidad de Las Américas, Quito 170125, Ecuador
- Grupo de Bio-Quimioinformática, Universidad de Las Américas, Quito 170125, Ecuador
| | - Vinicio Armijos-Jaramillo
- Grupo de Bio-Quimioinformática, Universidad de Las Américas, Quito 170125, Ecuador
- Ingeniería en Biotecnología, Facultad de Ingeniería y Ciencias Aplicadas, Universidad de Las Américas, Quito 170125, Ecuador
| | - Santiago Casado
- Facultad de Ciencia e Ingeniería en Alimentos y Biotecnología, Universidad Técnica de Ambato, Ambato 180216, Ecuador
| | - Karla Vizuete
- Centro de Nanociencia y Nanotecnología, Universidad de Las Fuerzas Armadas ESPE, Sangolquí 171103, Ecuador
| | - Alexis Debut
- Centro de Nanociencia y Nanotecnología, Universidad de Las Fuerzas Armadas ESPE, Sangolquí 171103, Ecuador
- Departamento de Ciencias de la Vida y Agricultura, Universidad de Las Fuerzas Armadas ESPE, Sangolquí 171103, Ecuador
| | - Liliana Cerda-Mejía
- Facultad de Ciencia e Ingeniería en Alimentos y Biotecnología, Universidad Técnica de Ambato, Ambato 180216, Ecuador
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Pico C, De la Vega J, Tubón I, Arancibia M, Casado S. Nanoscopic Characterization of Starch Biofilms Extracted from the Andean Tubers Ullucus tuberosus, Tropaeolum tuberosum, Oxalis tuberosa, and Solanum tuberosum. Polymers (Basel) 2022; 14:polym14194116. [PMID: 36236064 PMCID: PMC9573434 DOI: 10.3390/polym14194116] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2022] [Revised: 09/24/2022] [Accepted: 09/26/2022] [Indexed: 11/16/2022] Open
Abstract
The replacement of synthetic polymers by starch biofilms entails a significant potentiality. They are non-toxic materials, biodegradable, and relatively easy to gather from several sources. However, various applications may require physicochemical properties that might prevent the use of some types of starch biofilms. Causes should be explored at the nanoscale. Here we present an atomic force microscopy surface analysis of starch biofilms extracted from the Andean tubers melloco (Ullucus tuberosus), mashua (Tropaeolum tuberosum), oca (Oxalis tuberosa), and potato (Solanum tuberosum) and relate the results to the macroscopic effects of moisture content, water activity, total soluble matter, water vapor permeability, elastic properties, opacity and IR absorption. Characterization reveals important differences at the nanoscale between the starch-based biofilms examined. Comparison permitted correlating macroscopic properties observed to the topography and tapping phase contrast segregation at the nanoscale. For instance, those samples presenting granular topography and disconnected phases at the nanoscale are associated with less elastic strength and more water molecule affinity. As an application example, we propose using the starch biofilms developed as a matrix to dispose of mouthwash and discover that melloco films are quite appropriate for this purpose.
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Affiliation(s)
- Cynthia Pico
- Food and Biotechnology Science and Engineering Department, Technical University of Ambato, Ambato 180207, Ecuador
| | | | - Irvin Tubón
- Food and Biotechnology Science and Engineering Department, Technical University of Ambato, Ambato 180207, Ecuador
| | - Mirari Arancibia
- Food and Biotechnology Science and Engineering Department, Technical University of Ambato, Ambato 180207, Ecuador
- Isabrubotanik S.A., Ambato 180150, Ecuador
| | - Santiago Casado
- Food and Biotechnology Science and Engineering Department, Technical University of Ambato, Ambato 180207, Ecuador
- Correspondence: ; Tel.: +593-2400987 (ext. 5509)
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Salazar D, Arancibia M, Casado S, Viteri A, López-Caballero ME, Montero MP. Green Banana ( Musa acuminata AAA) Wastes to Develop an Edible Film for Food Applications. Polymers (Basel) 2021; 13:polym13183183. [PMID: 34578084 PMCID: PMC8472418 DOI: 10.3390/polym13183183] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [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: 08/15/2021] [Revised: 09/15/2021] [Accepted: 09/16/2021] [Indexed: 11/25/2022] Open
Abstract
In this study, edible packaging based on discarded green banana (Musa acuminata AAA) flour (whole banana and banana peel flours) was developed for food applications. Films were characterized in terms of film-forming ability, mechanical, barrier, thermal, microbiological, and sensory properties. The film forming solutions were studied for rheological properties. Two formulations were selected based on their film-forming ability: whole banana flour (2.5%), peel flour (1.5%) and glycerol (1.0 %, F-1.0 G or 1.5%, F-1.5 G). Adding 1.5% plasticizer, due to the hygroscopic effect, favored the water retention of the films, increasing the density, which also resulted in a decrease in lightness and transparency. Water activity shows no difference between the two formulations, which were water resistant for at least 25 h. DSC results showed a similar melting temperature (Tm) for both films, around 122 °C. Both films solutions showed a viscoelastic behavior in the frequency spectrum, being the elastic modulus greater in F-1.0 G film than F-1.5 G film at low frequency. F-1.0 G film was less firm, deformable and elastic, with a less compact structure and a rougher surface as confirmed by AFM, favoring a higher water vapor permeability with respect to F.1.5 G film. Microorganisms such as Enterobacteria and Staphylococcus aureus were not found in the films after a period of storage (1 year under ambient conditions). The F-1.0 G film with added spices (cumin, oregano, garlic, onion, pepper, and nutmeg) was tested for some food applications: as a snack (with or without heat treatment) and as a wrap for grilled chicken. The performance of the seasoned film during chilled storage of chicken breast was also studied. Sensory evaluation showed good overall acceptability of all applications. In addition, the chicken breast wrapped with the seasoned film registered lower counts (1-log cycle) than the control (covered with a polystyrene bag) and the film without spices. Green banana flour is a promising material to develop edible films for food applications.
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Affiliation(s)
- Diego Salazar
- Facultad de Ciencia e Ingeniería en Alimentos, Universidad Técnica de Ambato, Av. Los Chasquis y Rio Payamino, Ambato 180206, Ecuador; (M.A.); (S.C.); (A.V.)
- Facultad de Veterinaria, Universidad Complutense de Madrid, 28040 Madrid, Spain
- Correspondence: (D.S.); (M.P.M.)
| | - Mirari Arancibia
- Facultad de Ciencia e Ingeniería en Alimentos, Universidad Técnica de Ambato, Av. Los Chasquis y Rio Payamino, Ambato 180206, Ecuador; (M.A.); (S.C.); (A.V.)
| | - Santiago Casado
- Facultad de Ciencia e Ingeniería en Alimentos, Universidad Técnica de Ambato, Av. Los Chasquis y Rio Payamino, Ambato 180206, Ecuador; (M.A.); (S.C.); (A.V.)
| | - Andrés Viteri
- Facultad de Ciencia e Ingeniería en Alimentos, Universidad Técnica de Ambato, Av. Los Chasquis y Rio Payamino, Ambato 180206, Ecuador; (M.A.); (S.C.); (A.V.)
| | - María Elvira López-Caballero
- Instituto de Ciencia y Tecnología de Alimentos y Nutrición (ICTAN-CSIC), Calle José Antonio Novais 10, 28040 Madrid, Spain;
| | - María Pilar Montero
- Instituto de Ciencia y Tecnología de Alimentos y Nutrición (ICTAN-CSIC), Calle José Antonio Novais 10, 28040 Madrid, Spain;
- Correspondence: (D.S.); (M.P.M.)
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Gros-Otero J, Ketabi S, Cañones-Zafra R, Garcia-Gonzalez M, Villa-Collar C, Casado S, Teus MA. Atomic force microscopy comparative analysis of the surface roughness of two posterior chamber phakic intraocular lens models: ICL versus IPCL. BMC Ophthalmol 2021; 21:280. [PMID: 34261440 PMCID: PMC8281652 DOI: 10.1186/s12886-021-02039-6] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2020] [Accepted: 06/02/2021] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND To compare the anterior surface roughness of two commercially available posterior chamber phakic intraocular lenses (IOLs) using atomic force microscopy (AFM). METHODS Four phakic IOLs were used for this prospective, experimental study: two Visian ICL EVO+ V5 lenses and two iPCL 2.0 lenses. All of them were brand new, were not previously implanted in humans, were monofocal and had a dioptric power of - 12 diopters (D). The anterior surface roughness was assessed using a JPK NanoWizard II® atomic force microscope in contact mode immersed in liquid. Olympus OMCL-RC800PSA commercial silicon nitride cantilever tips were used. Anterior surface roughness measurements were made in 7 areas of 10 × 10 μm at 512 × 512 point resolution. The roughness was measured using the root-mean-square (RMS) value within the given regions. RESULTS The mean of all anterior surface roughness measurements was 6.09 ± 1.33 nm (nm) in the Visian ICL EVO+ V5 and 3.49 ± 0.41 nm in the iPCL 2.0 (p = 0.001). CONCLUSION In the current study, we found a statistically significant smoother anterior surface in the iPCL 2.0 phakic intraocular lenses compared with the VISIAN ICL EVO+ V5 lenses when studied with atomic force microscopy.
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Affiliation(s)
- Juan Gros-Otero
- Clínica Rementería, Calle Almagro, 36, Madrid, Spain. .,Universidad CEU San Pablo, Campus Montepríncipe, Madrid, Spain.
| | - Samira Ketabi
- Hospital Universitario Príncipe de Asturias, Carretera Meco s/n, Madrid, Spain
| | | | - Montserrat Garcia-Gonzalez
- Clínica Rementería, Calle Almagro, 36, Madrid, Spain.,Clínica Novovisión, Paseo de la Castellan, Madrid, Spain
| | - Cesar Villa-Collar
- Clínica Novovisión, Paseo de la Castellan, Madrid, Spain.,Universidad Europea, Madrid, Spain
| | - Santiago Casado
- Facultad de Ciencia e Ingeniería de Alimentos, Universidad Técnica de Ambato, Ambato, Ecuador.,IMDEA-Nanociencia, Campus Universitario de Cantoblanco, 28049, Madrid, Spain
| | - Miguel A Teus
- Hospital Universitario Príncipe de Asturias, Carretera Meco s/n, Madrid, Spain.,Clínica Novovisión, Paseo de la Castellan, Madrid, Spain
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Gros-Otero J, Ketabi S, Cañones-Zafra R, Garcia-Gonzalez M, Villa-Collar C, Casado S, Teus MA. Corneal stromal roughness after VisuMax and Intralase femtosecond laser photodisruption: An atomic force microscopy study. PLoS One 2021; 16:e0252449. [PMID: 34043738 PMCID: PMC8158881 DOI: 10.1371/journal.pone.0252449] [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] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2020] [Accepted: 05/16/2021] [Indexed: 11/26/2022] Open
Abstract
Purpose To compare the induced corneal stromal bed roughness measured with atomic force microscopy (AFM) after LASIK flap creation with the IntraLase 60 kHz and the VisuMax femtosecond laser platforms. Methods Three freshly enucleated porcine eyes were operated with each femtosecond laser in this experimental study. Standard LASIK treatment parameters were used for the experiment. After LASIK flap creation, the corneal stromal roughness was assessed using a JPK NanoWizard II® AFM in contact mode immersed in liquid. Olympus OMCL-RC800PSA commercial silicon nitride cantilever tips were used. Surface measurements were made in 10 regions of the central cornea of each sample measuring 20 x 20 microns, at 512 x 512 point resolution. Roughness was measured using the root-mean-square (RMS) value within the given regions. Results Measurements from 30 regions of the 3 eyes (10 measurements per eye) in the Intralase (FS1) group, and 30 regions of the 3 eyes (10 measurements per eye) in the VisuMax (FS2) group were analyzed. There was a statistically significant difference in mean ± standard deviation RMS values between the FS1 and the FS2 groups (360 ± 120 versus 230 ± 100 nm respectively; P< 0.00001). Conclusion This AFM study indicates that the surface of the stromal bed after LASIK flap creation is smoother in the FS2 group than the FS1 group.
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Affiliation(s)
- Juan Gros-Otero
- Clínica Rementería, Madrid, Spain
- Universidad CEU San Pablo, Madrid, Spain
- * E-mail:
| | - Samira Ketabi
- Hospital Universitario Príncipe de Asturias, Alcalá de Henares, Madrid, Spain
| | | | | | | | - Santiago Casado
- IMDEA Nanociencia, Madrid, Spain
- Facultad de Ciencia e Ingeniería de Alimentos, Universidad Técnica de Ambato, Ambato, Ecuador
| | - Miguel A. Teus
- Hospital Universitario Príncipe de Asturias, Alcalá de Henares, Madrid, Spain
- Clínica Novovisión, Madrid, Spain
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Mejias SH, López-Martínez E, Fernandez M, Couleaud P, Martin-Lasanta A, Romera D, Sanchez-Iglesias A, Casado S, Osorio MR, Abad JM, González MT, Cortajarena AL. Engineering conductive protein films through nanoscale self-assembly and gold nanoparticles doping. Nanoscale 2021; 13:6772-6779. [PMID: 33885479 DOI: 10.1039/d1nr00238d] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Protein-based materials are usually considered as insulators, although conductivity has been recently shown in proteins. This fact opens the door to develop new biocompatible conductive materials. While there are emerging efforts in this area, there is an open challenge related to the limited conductivity of protein-based systems. This work shows a novel approach to tune the charge transport properties of protein-based materials by using electron-dense AuNPs. Two strategies are combined in a unique way to generate the conductive solid films: (1) the controlled self-assembly of a protein building block; (2) the templating of AuNPs by the engineered building block. This bottom-up approach allows controlling the structure of the films and the distribution of the AuNPs within, leading to enhanced conductivity. This work illustrates a promising strategy for the development of effective hybrid protein-based bioelectrical materials.
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Affiliation(s)
- Sara H Mejias
- IMDEA Nanociencia, Campus Universitario de Cantoblanco, C\Faraday, 9, 28049 Madrid, Spain.
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Chamorro PB, Aparicio F, Chamorro R, Bilbao N, Casado S, González-Rodríguez D. Exploring the tubular self-assembly landscape of dinucleobase amphiphiles in water. Org Chem Front 2021. [DOI: 10.1039/d0qo01110j] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The tubular aqueous assembly of dinucleobase amphiphilic monomers endowed with anionic, neutral or cationic groups is investigated under diverse conditions.
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Affiliation(s)
- Paula B. Chamorro
- Organic Chemistry Department
- Universidad Autónoma de Madrid
- 28049 Madrid
- Spain
| | - Fatima Aparicio
- Organic Chemistry Department
- Universidad Autónoma de Madrid
- 28049 Madrid
- Spain
| | - Raquel Chamorro
- Organic Chemistry Department
- Universidad Autónoma de Madrid
- 28049 Madrid
- Spain
| | - Nerea Bilbao
- Department of Chemistry
- Division of Molecular Imaging and Photonics
- KU Leuven
- B-3001 Leuven
- Belgium
| | | | - David González-Rodríguez
- Organic Chemistry Department
- Universidad Autónoma de Madrid
- 28049 Madrid
- Spain
- Institute for Advanced Research in Chemical Sciences (IAdChem)
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11
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Aparicio F, Chamorro PB, Chamorro R, Casado S, González‐Rodríguez D. Nanostructured Micelle Nanotubes Self‐Assembled from Dinucleobase Monomers in Water. Angew Chem Int Ed Engl 2020; 59:17091-17096. [DOI: 10.1002/anie.202006877] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2020] [Indexed: 11/12/2022]
Affiliation(s)
- Fátima Aparicio
- Nanostructured Molecular Systems and Materials (MSMn) Group Departamento de Química Orgánica Facultad de Ciencias Universidad Autónoma de Madrid 28049 Madrid Spain
| | - Paula B. Chamorro
- Nanostructured Molecular Systems and Materials (MSMn) Group Departamento de Química Orgánica Facultad de Ciencias Universidad Autónoma de Madrid 28049 Madrid Spain
| | - Raquel Chamorro
- Nanostructured Molecular Systems and Materials (MSMn) Group Departamento de Química Orgánica Facultad de Ciencias Universidad Autónoma de Madrid 28049 Madrid Spain
| | - Santiago Casado
- IMDEA Nanociencia c/ Faraday 9, Campus de Cantoblanco 28049 Madrid Spain
| | - David González‐Rodríguez
- Nanostructured Molecular Systems and Materials (MSMn) Group Departamento de Química Orgánica Facultad de Ciencias Universidad Autónoma de Madrid 28049 Madrid Spain
- Institute for Advanced Research in Chemical Sciences (IAdChem) Universidad Autónoma de Madrid 28049 Madrid Spain
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12
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Aparicio F, Chamorro PB, Chamorro R, Casado S, González‐Rodríguez D. Nanostructured Micelle Nanotubes Self‐Assembled from Dinucleobase Monomers in Water. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202006877] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Fátima Aparicio
- Nanostructured Molecular Systems and Materials (MSMn) Group Departamento de Química Orgánica Facultad de Ciencias Universidad Autónoma de Madrid 28049 Madrid Spain
| | - Paula B. Chamorro
- Nanostructured Molecular Systems and Materials (MSMn) Group Departamento de Química Orgánica Facultad de Ciencias Universidad Autónoma de Madrid 28049 Madrid Spain
| | - Raquel Chamorro
- Nanostructured Molecular Systems and Materials (MSMn) Group Departamento de Química Orgánica Facultad de Ciencias Universidad Autónoma de Madrid 28049 Madrid Spain
| | - Santiago Casado
- IMDEA Nanociencia c/ Faraday 9, Campus de Cantoblanco 28049 Madrid Spain
| | - David González‐Rodríguez
- Nanostructured Molecular Systems and Materials (MSMn) Group Departamento de Química Orgánica Facultad de Ciencias Universidad Autónoma de Madrid 28049 Madrid Spain
- Institute for Advanced Research in Chemical Sciences (IAdChem) Universidad Autónoma de Madrid 28049 Madrid Spain
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13
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Rapakousiou A, López-Moreno A, Nieto-Ortega B, Bernal MM, Monclús MA, Casado S, Navío C, González LR, Fernández-Blázquez JP, Vilatela JJ, Pérez EM. Stronger aramids through molecular design and nanoprocessing. Polym Chem 2020. [DOI: 10.1039/c9py01599j] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We describe how to build ultrastrong polymeric nanofilms through a combination of molecular design and nanostructuration.
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Affiliation(s)
| | | | | | | | | | | | | | - Luisa R. González
- Departamento de Química Inorgánica
- Universidad Complutense de Madrid
- Madrid
- Spain
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14
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Gros-Otero J, Ketabi S, Cañones-Zafra R, Garcia-Gonzalez M, Parafita-Fernandez A, Villa-Collar C, Casado S, Teus M. Analysis of corneal stromal roughness after iFS 150 kHz and LenSx femtosecond LASIK flap creation in porcine eyes. Graefes Arch Clin Exp Ophthalmol 2019; 257:2665-2670. [PMID: 31650272 DOI: 10.1007/s00417-019-04497-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2019] [Revised: 09/20/2019] [Accepted: 09/23/2019] [Indexed: 10/25/2022] Open
Abstract
PURPOSE To describe and compare the stromal bed roughness obtained after laser in situ keratomileusis (LASIK) flap creation using a corneal femtosecond laser platform (iFS 150) and a "dual" femtosecond (FS) laser platform (LenSx). METHODS This ex vivo experimental study was conducted in an animal model using 12 freshly enucleated porcine eyes, six with each femtosecond laser. The standard laser treatment parameters were used for the experiment. After LASIK flap creation, the corneal stromal roughness was assessed using atomic force microscopy (AFM) in contact mode immersed in liquid. In each sample, surface measurements were obtained in 60 regions of six eyes per FS laser in 10 20 × 20-micron areas of the central corneal stroma at 512 × 512-point resolution. The surface roughness was measured and the root-mean-square (RMS) values of the roughness were obtained. RESULTS The mean RMS ± standard deviation values were 430 ± 150 nm for the corneal femtosecond laser platform and 370 ± 100 nm for the dual FS laser platform (P < 0.011). CONCLUSIONS In this experimental study with AFM, we found smoother stromal beds after LASIK flap creation with LenSx compared to iFS 150 kHz. Further studies are needed to understand visual implications of the differences found.
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Affiliation(s)
- Juan Gros-Otero
- Clínica Rementería, Calle Almagro, 36, 28010, Madrid, Spain. .,Universidad CEU San Pablo, Madrid, Spain.
| | - Samira Ketabi
- Hospital Universitario Príncipe de Asturias, Madrid, Spain
| | | | - Montserrat Garcia-Gonzalez
- Clínica Rementería, Calle Almagro, 36, 28010, Madrid, Spain.,Clínica Novovisión, Madrid, Spain.,Universidad Europea de Madrid, Madrid, Spain
| | | | | | - Santiago Casado
- Facultad de Ciencia e Ingeniería de Alimentos, Universidad Técnica de Ambato, Ambato, Ecuador.,IMDEA Nanociencia, Madrid, Spain
| | - Miguel Teus
- Hospital Universitario Príncipe de Asturias, Madrid, Spain.,Clínica Novovisión, Madrid, Spain
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15
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Sanchez-deAlcazar D, Romera D, Castro-Smirnov J, Sousaraei A, Casado S, Espasa A, Morant-Miñana MC, Hernandez JJ, Rodríguez I, Costa RD, Cabanillas-Gonzalez J, Martinez RV, Cortajarena AL. Engineered protein-based functional nanopatterned materials for bio-optical devices. Nanoscale Adv 2019; 1:3980-3991. [PMID: 36132122 PMCID: PMC9418893 DOI: 10.1039/c9na00289h] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/08/2019] [Accepted: 08/20/2019] [Indexed: 05/08/2023]
Abstract
The development of new active biocompatible materials and devices is a current need for their implementation in multiple fields, including the fabrication of implantable devices for biomedical applications and sustainable devices for bio-optics and bio-optoelectronics. This paper describes a simple strategy to use designed proteins to develop protein-based functional materials. Using simple proteins as self-assembling building blocks as a platform for the fabrication of new optically active materials takes previous work one step further towards the design of materials with defined structures and functions using naturally occurring protein materials, such as silk. The proposed fabrication strategy generates thin and flexible nanopatterned protein films by letting the engineered protein elements self-assemble over the surface of an elastomeric stamp with nanoscale features. These nanopatterned protein films are easily transferred onto 3D objects (flat and curved) by moisture-induced adhesion. Additionally, flexible nanopatterned protein films are prepared by incorporating a thin polymeric layer as a back support. Finally, taking advantage of the tunability of the selected protein scaffold, the flexible protein-based surfaces are endowed with optical functions, achieving efficient lasing features. As such, this work enables the simple and cost-effective production of flexible and nanostructured, protein-based, optically active biomaterials and devices over large areas toward emerging applications.
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Affiliation(s)
| | - David Romera
- IMDEA-Nanociencia Campus Universitario de Cantoblanco 28049 Madrid Spain
| | | | - Ahmad Sousaraei
- IMDEA-Nanociencia Campus Universitario de Cantoblanco 28049 Madrid Spain
| | - Santiago Casado
- IMDEA-Nanociencia Campus Universitario de Cantoblanco 28049 Madrid Spain
- Facultad de Ciencia e Ingeniería en Alimentos, Universidad Técnica de Ambato Avda. Los Chasquis y río Payamino s/n 180207 Ambato Ecuador
| | - Anna Espasa
- IMDEA-Materiales C/Eric Kandel, 2 - Tecnogetafe 28906 Getafe-Madrid Spain
| | - María C Morant-Miñana
- CIC energiGUNE Parque Tecnologico de Alava, Albert Einstein 48 ED CIC 01510 Miñano Spain
| | - Jaime J Hernandez
- IMDEA-Nanociencia Campus Universitario de Cantoblanco 28049 Madrid Spain
| | - Isabel Rodríguez
- IMDEA-Nanociencia Campus Universitario de Cantoblanco 28049 Madrid Spain
| | - Rubén D Costa
- IMDEA-Materiales C/Eric Kandel, 2 - Tecnogetafe 28906 Getafe-Madrid Spain
| | | | - Ramses V Martinez
- School of Industrial Engineering, Purdue University 315 N. Grant Street West Lafayette Indiana 47907 USA
- Weldon School of Biomedical Engineering, Purdue University 206 S. Martin Jischke Drive West Lafayette Indiana 47907 USA
| | - Aitziber L Cortajarena
- CIC biomaGUNE Paseo de Miramón 182 E-20014 Donostia-San Sebastian Spain
- IMDEA-Nanociencia Campus Universitario de Cantoblanco 28049 Madrid Spain
- Ikerbasque, Basque Foundation for Science Ma Díaz de Haro 3 48013 Bilbao Spain
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16
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Zhang Q, Wei Q, Guo X, Hai G, Sun H, Li J, Xia R, Qian Y, Casado S, Castro‐Smirnov JR, Cabanillas‐Gonzalez J. Concurrent Optical Gain Optimization and Electrical Tuning in Novel Oligomer:Polymer Blends with Yellow-Green Laser Emission. Adv Sci (Weinh) 2019; 6:1801455. [PMID: 30643727 PMCID: PMC6325601 DOI: 10.1002/advs.201801455] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/29/2018] [Revised: 09/27/2018] [Indexed: 06/09/2023]
Abstract
Electrically pumped organic lasing requires the integration of electrodes contact into the laser cavity in an organic light-emitting diode (OLED) or organic field effect transistor configuration to enable charge injection. Efficient and balanced carrier injection requires in turn alignment of the energy levels of the organic active layers with the Fermi levels of the cathode and anode. This can be achieved through chemical substitution with specific aromatic functional groups, although paying the price for a substantial (and often detrimental) change in the emission and light amplifying properties of the organic gain medium. Here, using host-guest energy transfer mixtures with hosts bearing a systematic and gradual shift in molecular orbitals is proposed, which reduces the amplified spontaneous emission (ASE) threshold of the organic gain medium significantly while leaving the peak emission unaffected. By virtue of the low guest doping required for complete host-to-guest energy transfer, the injection levels in the blends are attributed to the host whereas the gain properties solely depend on the guest. It is demonstrated that the ASE peak and thresholds of blends with different hosts do not differ while the current efficiency of OLEDs devices is deeply influenced by molecular orbital tuning of the hosts.
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Affiliation(s)
- Qi Zhang
- Key Laboratory for Organic Electronics and Information Displays (KLOEID)Jiangsu‐Singapore Joint Research Center for Organic/Bio Electronics and Information DisplaysInstitute of Advanced Materials (IAM)Nanjing University of Posts and Telecommunications9 Wenyuan RoadNanjing210046P. R. China
- IMDEA NanoscienceCalle Faraday 9Cantoblanco28049MadridSpain
| | - Qi Wei
- Shaanxi Institute of Flexible Electronics (SIFE)Northwestern Polytechnical University (NPU)127 West Youyi RoadXi'an710072ShanxiChina
| | - Xiangru Guo
- Key Laboratory for Organic Electronics and Information Displays (KLOEID)Jiangsu‐Singapore Joint Research Center for Organic/Bio Electronics and Information DisplaysInstitute of Advanced Materials (IAM)Nanjing University of Posts and Telecommunications9 Wenyuan RoadNanjing210046P. R. China
| | - Gang Hai
- Key Laboratory for Organic Electronics and Information Displays (KLOEID)Jiangsu‐Singapore Joint Research Center for Organic/Bio Electronics and Information DisplaysInstitute of Advanced Materials (IAM)Nanjing University of Posts and Telecommunications9 Wenyuan RoadNanjing210046P. R. China
| | - Huizhi Sun
- Key Laboratory for Organic Electronics and Information Displays (KLOEID)Jiangsu‐Singapore Joint Research Center for Organic/Bio Electronics and Information DisplaysInstitute of Advanced Materials (IAM)Nanjing University of Posts and Telecommunications9 Wenyuan RoadNanjing210046P. R. China
| | - Jiewei Li
- Key Laboratory of Flexible Electronics (KLOFE) and Institute of Advanced Materials (IAM)Jiangsu National Synergistic Innovation Center for Advanced Materials (SICAM)Nanjing Tech University (NanjingTech)30 South Puzhu RoadNanjing211816China
| | - Ruidong Xia
- Key Laboratory for Organic Electronics and Information Displays (KLOEID)Jiangsu‐Singapore Joint Research Center for Organic/Bio Electronics and Information DisplaysInstitute of Advanced Materials (IAM)Nanjing University of Posts and Telecommunications9 Wenyuan RoadNanjing210046P. R. China
| | - Yan Qian
- Key Laboratory for Organic Electronics and Information Displays (KLOEID)Jiangsu‐Singapore Joint Research Center for Organic/Bio Electronics and Information DisplaysInstitute of Advanced Materials (IAM)Nanjing University of Posts and Telecommunications9 Wenyuan RoadNanjing210046P. R. China
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17
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de Juan-Fernández L, Münich PW, Puthiyedath A, Nieto-Ortega B, Casado S, Ruiz-González L, Pérez EM, Guldi DM. Interfacing porphyrins and carbon nanotubes through mechanical links. Chem Sci 2018; 9:6779-6784. [PMID: 30310610 PMCID: PMC6115000 DOI: 10.1039/c8sc02492h] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [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: 06/06/2018] [Accepted: 06/29/2018] [Indexed: 11/21/2022] Open
Abstract
We describe the synthesis of rotaxane-type species composed of macrocyclic porphyrin rings mechanically interlocked with SWCNT threads. The formation of mechanically interlocked SWCNTs (MINTs) proceeds with chiral selectivity, and was confirmed by spectroscopic and analytical techniques and adequate control experiments, and corroborated by high-resolution electron microscopy. From a thorough characterization of the MINTs through UV-vis-NIR absorption, fluorescence, Raman, and transient absorption spectroscopy we analyse in detail the electronic interactions of the porphyrins and the SWCNTs in the ground and excited states.
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Affiliation(s)
- Leire de Juan-Fernández
- IMDEA Nanoscience , C/ Faraday 9, Ciudad Universitaria de Cantoblanco , 28049 Madrid , Spain .
| | - Peter W Münich
- Department of Chemistry and Pharmacy , Interdisciplinary Center for Molecular Materials , Friedrich-Alexander University of Erlangen-Nürnberg , Egerlandstr. 3 , 91058 Erlangen , Germany .
| | - Arjun Puthiyedath
- Department of Chemistry and Pharmacy , Interdisciplinary Center for Molecular Materials , Friedrich-Alexander University of Erlangen-Nürnberg , Egerlandstr. 3 , 91058 Erlangen , Germany .
| | - Belén Nieto-Ortega
- IMDEA Nanoscience , C/ Faraday 9, Ciudad Universitaria de Cantoblanco , 28049 Madrid , Spain .
| | - Santiago Casado
- IMDEA Nanoscience , C/ Faraday 9, Ciudad Universitaria de Cantoblanco , 28049 Madrid , Spain .
| | - Luisa Ruiz-González
- Departamento de Química Inorgánica , Fac. C. C. Químicas , Universidad Complutense de Madrid , Avenida Complutense s/n , 28040 Madrid , Spain
| | - Emilio M Pérez
- IMDEA Nanoscience , C/ Faraday 9, Ciudad Universitaria de Cantoblanco , 28049 Madrid , Spain .
| | - Dirk M Guldi
- Department of Chemistry and Pharmacy , Interdisciplinary Center for Molecular Materials , Friedrich-Alexander University of Erlangen-Nürnberg , Egerlandstr. 3 , 91058 Erlangen , Germany .
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18
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Nandajan PC, Kim HJ, Casado S, Park SY, Gierschner J. Insight into Water-Soluble Highly Fluorescent Low-Dimensional Host-Guest Supramolecular Polymers: Structure and Energy-Transfer Dynamics Revealed by Polarized Fluorescence Spectroscopy. J Phys Chem Lett 2018; 9:3870-3877. [PMID: 29939753 DOI: 10.1021/acs.jpclett.8b01562] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Water-soluble, highly fluorescent host-guest chromophore-cucurbit[8]uril supramolecular polymer bundles are investigated by polarized time-resolved photoluminescence spectroscopy, structural methods, and quantum chemistry to fully reveal structural organization and heterogeneity but, in particular, energy-transfer dynamics, being of crucial importance for the design of supramolecular artificial light-harvesting systems.
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Affiliation(s)
- Paramjyothi C Nandajan
- Madrid Institute for Advanced Studies , IMDEA Nanoscience , Calle Faraday 9, Campus Cantoblanco , 28049 Madrid , Spain
| | - Hyeong-Ju Kim
- Center for Supramolecular Optoelectronic Materials, Department of Materials Science and Engineering , Seoul National University , ENG 445, Seoul 151-744 , Korea
| | - Santiago Casado
- Madrid Institute for Advanced Studies , IMDEA Nanoscience , Calle Faraday 9, Campus Cantoblanco , 28049 Madrid , Spain
| | - Soo Young Park
- Center for Supramolecular Optoelectronic Materials, Department of Materials Science and Engineering , Seoul National University , ENG 445, Seoul 151-744 , Korea
| | - Johannes Gierschner
- Madrid Institute for Advanced Studies , IMDEA Nanoscience , Calle Faraday 9, Campus Cantoblanco , 28049 Madrid , Spain
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19
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Blanco M, Nieto-Ortega B, de Juan A, Vera-Hidalgo M, López-Moreno A, Casado S, González LR, Sawada H, González-Calbet JM, Pérez EM. Positive and negative regulation of carbon nanotube catalysts through encapsulation within macrocycles. Nat Commun 2018; 9:2671. [PMID: 29991679 PMCID: PMC6039438 DOI: 10.1038/s41467-018-05183-8] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [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: 01/18/2018] [Accepted: 06/20/2018] [Indexed: 11/09/2022] Open
Abstract
One of the most attractive applications of carbon nanomaterials is as catalysts, due to their extreme surface-to-volume ratio. The substitution of C with heteroatoms (typically B and N as p- and n-dopants) has been explored to enhance their catalytic activity. Here we show that encapsulation within weakly doping macrocycles can be used to modify the catalytic properties of the nanotubes towards the reduction of nitroarenes, either enhancing it (n-doping) or slowing it down (p-doping). This artificial regulation strategy presents a unique combination of features found in the natural regulation of enzymes: binding of the effectors (the macrocycles) is noncovalent, yet stable thanks to the mechanical link, and their effect is remote, but not allosteric, since it does not affect the structure of the active site. By careful design of the macrocycles' structure, we expect that this strategy will contribute to overcome the major hurdles in SWNT-based catalysts: activity, aggregation, and specificity.
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Affiliation(s)
- Matías Blanco
- IMDEA Nanociencia, Ciudad Universitaria de Cantoblanco, c/Faraday 9, 28049, Madrid, Spain
| | - Belén Nieto-Ortega
- IMDEA Nanociencia, Ciudad Universitaria de Cantoblanco, c/Faraday 9, 28049, Madrid, Spain
| | - Alberto de Juan
- IMDEA Nanociencia, Ciudad Universitaria de Cantoblanco, c/Faraday 9, 28049, Madrid, Spain
| | - Mariano Vera-Hidalgo
- IMDEA Nanociencia, Ciudad Universitaria de Cantoblanco, c/Faraday 9, 28049, Madrid, Spain
| | - Alejandro López-Moreno
- IMDEA Nanociencia, Ciudad Universitaria de Cantoblanco, c/Faraday 9, 28049, Madrid, Spain
| | - Santiago Casado
- IMDEA Nanociencia, Ciudad Universitaria de Cantoblanco, c/Faraday 9, 28049, Madrid, Spain
| | - Luisa R González
- Departamento de Química Inorgánica, Universidad Complutense de Madrid, 28040, Madrid, Spain
| | | | - José M González-Calbet
- Departamento de Química Inorgánica, Universidad Complutense de Madrid, 28040, Madrid, Spain
| | - Emilio M Pérez
- IMDEA Nanociencia, Ciudad Universitaria de Cantoblanco, c/Faraday 9, 28049, Madrid, Spain.
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20
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Chamorro R, de Juan-Fernández L, Nieto-Ortega B, Mayoral MJ, Casado S, Ruiz-González L, Pérez EM, González-Rodríguez D. Reversible dispersion and release of carbon nanotubes via cooperative clamping interactions with hydrogen-bonded nanorings. Chem Sci 2018; 9:4176-4184. [PMID: 29780548 PMCID: PMC5941269 DOI: 10.1039/c8sc00843d] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [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: 02/21/2018] [Accepted: 04/04/2018] [Indexed: 01/30/2023] Open
Abstract
Due to their outstanding electronic and mechanical properties, single-walled carbon nanotubes (SWCNTs) are promising nanomaterials for the future generation of optoelectronic devices and composites. However, their scarce solubility limits their application in many technologies that demand solution-processing of high-purity SWCNT samples. Although some non-covalent functionalization approaches have demonstrated their utility in extracting SWCNTs into different media, many of them produce short-lived dispersions or ultimately suffer from contamination by the dispersing agent. Here, we introduce an unprecedented strategy that relies on a cooperative clamping process. When mixing (6,5)SWCNTs with a dinucleoside monomer that is able to self-assemble in nanorings via Watson-Crick base-pairing, a synergistic relationship is established. On one hand, the H-bonded rings are able to associate intimately with SWCNTs by embracing the tube sidewalls, which allows for an efficient SWCNT debundling and for the production of long-lasting SWCNT dispersions of high optical quality along a broad concentration range. On the other, nanoring stability is enhanced in the presence of SWCNTs, which are suitable guests for the ring cavity and contribute to the establishment of multiple cooperative noncovalent interactions. The inhibition of these reversible interactions, by just adding, for instance, a competing solvent for hydrogen-bonding, proved to be a simple and effective method to recover the pristine nanomaterial with no trace of the dispersing agent.
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Affiliation(s)
- Raquel Chamorro
- Organic Chemistry Department , Universidad Autónoma de Madrid , 28049 Madrid , Spain .
| | | | - Belén Nieto-Ortega
- IMDEA Nanociencia , c/Faraday 9, Campus de Cantoblanco , 28049 , Madrid , Spain .
| | - Maria J Mayoral
- Organic Chemistry Department , Universidad Autónoma de Madrid , 28049 Madrid , Spain .
| | - Santiago Casado
- IMDEA Nanociencia , c/Faraday 9, Campus de Cantoblanco , 28049 , Madrid , Spain .
| | - Luisa Ruiz-González
- Inorganic Chemistry Department , Universidad Complutense de Madrid , 28040 , Madrid , Spain
| | - Emilio M Pérez
- IMDEA Nanociencia , c/Faraday 9, Campus de Cantoblanco , 28049 , Madrid , Spain .
| | - David González-Rodríguez
- Organic Chemistry Department , Universidad Autónoma de Madrid , 28049 Madrid , Spain .
- Institute for Advanced Research in Chemical Sciences (IAdChem) , Universidad Autónoma de Madrid , 28049 Madrid , Spain
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21
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Bondia P, Jurado R, Casado S, Domínguez-Vera JM, Gálvez N, Flors C. Hybrid Nanoscopy of Hybrid Nanomaterials. Small 2017; 13. [PMID: 28257567 DOI: 10.1002/smll.201603784] [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: 11/11/2016] [Revised: 12/20/2016] [Indexed: 05/05/2023]
Abstract
The combination of complementary techniques to characterize materials at the nanoscale is crucial to gain a more complete picture of their structure, a key step to design and fabricate new materials with improved properties and diverse functions. Here it is shown that correlative atomic force microscopy (AFM) and localization-based super-resolution microscopy is a useful tool that provides insight into the structure and emissive properties of fluorescent β-lactoglobulin (βLG) amyloid-like fibrils. These hybrid materials are made by functionalization of βLG with organic fluorophores and quantum dots, the latter being relevant for the production of 1D inorganic nanostructures templated by self-assembling peptides. Simultaneous functionalization of βLG fibers by QD655 and QD525 allows for correlative AFM and two-color super-resolution fluorescence imaging of these hybrid materials. These experiments allow the combination of information about the topography and number of filaments that compose a fibril, as well as the emissive properties and nanoscale spatial distribution of the attached fluorophores. This study represents an important step forward in the characterization of multifunctionalized hybrid materials, a key challenge in nanoscience.
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Affiliation(s)
- Patricia Bondia
- Madrid Institute for Advanced Studies in Nanoscience (IMDEA Nanoscience) and Nanobiotechnology Unit Associated to the National Center for Biotechnology (CNB-CSIC), C/Faraday 9, 28049, Madrid, Spain
| | - Rocío Jurado
- Department of Inorganic Chemistry, University of Granada. Av. Fuentenueva s/n, 18071, Granada, Spain
| | - Santiago Casado
- Madrid Institute for Advanced Studies in Nanoscience (IMDEA Nanoscience) and Nanobiotechnology Unit Associated to the National Center for Biotechnology (CNB-CSIC), C/Faraday 9, 28049, Madrid, Spain
| | - José M Domínguez-Vera
- Department of Inorganic Chemistry, University of Granada. Av. Fuentenueva s/n, 18071, Granada, Spain
| | - Natividad Gálvez
- Department of Inorganic Chemistry, University of Granada. Av. Fuentenueva s/n, 18071, Granada, Spain
| | - Cristina Flors
- Madrid Institute for Advanced Studies in Nanoscience (IMDEA Nanoscience) and Nanobiotechnology Unit Associated to the National Center for Biotechnology (CNB-CSIC), C/Faraday 9, 28049, Madrid, Spain
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22
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Casado S. Studying friction while playing the violin: exploring the stick-slip phenomenon. Beilstein J Nanotechnol 2017; 8:159-166. [PMID: 28243552 PMCID: PMC5302002 DOI: 10.3762/bjnano.8.16] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/12/2016] [Accepted: 12/21/2016] [Indexed: 05/28/2023]
Abstract
Controlling the stick-slip friction phenomenon is of major importance for many familiar situations. This effect originates from the periodic rupture of junctions created between two rubbing surfaces due to the increasing shear stress at the interface. It is ultimately responsible for the behavior of many braking systems, earthquakes, and unpleasant squeaky sounds caused by the scratching of two surfaces. In the case of a musical bow-stringed instrument, stick-slip is controlled in order to provide well-tuned notes at different intensities. A trained ear is able to distinguish slight sound variations caused by small friction differences. Hence, a violin can be regarded as a perfect benchmark to explore the stick-slip effect at the mesoscale. Two violin bow hairs were studied, a natural horse tail used in a professional philharmonic orchestra, and a synthetic one used with a violin for beginners. Atomic force microscopy characterization revealed clear differences when comparing the surfaces of both bow hairs, suggesting that a structure having peaks and a roughness similar to that of the string to which both bow hairs rubbed permits a better control of the stick-slip phenomenon.
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Affiliation(s)
- Santiago Casado
- Madrid Institute for Advanced Studies in Nanoscience (IMDEA Nanoscience), Faraday 9, Ciudad Universitaria de Cantoblanco, 28049 Madrid, Spain
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23
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Bondia P, Casado S, Flors C. Correlative Super-Resolution Fluorescence Imaging and Atomic Force Microscopy for the Characterization of Biological Samples. Methods Mol Biol 2017; 1663:105-113. [PMID: 28924662 DOI: 10.1007/978-1-4939-7265-4_9] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Recent advances in imaging tools have greatly improved our ability to analyze the structure and molecular components of a wide range of biological systems at the nanoscale. High resolution imaging can be performed with a handful of techniques, each of them revealing particular features of the sample. A more comprehensive picture of a biological system can be achieved by combining the information provided by complementary imaging methods. Specifically, the correlation between super-resolution fluorescence imaging and atomic force microscopy (AFM) provides high resolution topography as well as specific chemical information, the latter with a spatial resolution that approaches that of AFM. We present a detailed protocol and discuss the requirements and challenges in terms of sample preparation, instrumentation, and image alignment to combine these two powerful techniques. This hybrid nanoscale imaging tool has the potential to provide robust validation for super-resolution methods as well as new insight into biological samples.
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Affiliation(s)
- Patricia Bondia
- Madrid Institute for Advanced Studies in Nanoscience (IMDEA Nanoscience) and Nanobiotechnology Unit Associated to the National Center for Biotechnology (CSIC), C/ Faraday 9, Madrid, 28049, Spain
| | - Santiago Casado
- Madrid Institute for Advanced Studies in Nanoscience (IMDEA Nanoscience) and Nanobiotechnology Unit Associated to the National Center for Biotechnology (CSIC), C/ Faraday 9, Madrid, 28049, Spain
| | - Cristina Flors
- Madrid Institute for Advanced Studies in Nanoscience (IMDEA Nanoscience) and Nanobiotechnology Unit Associated to the National Center for Biotechnology (CSIC), C/ Faraday 9, Madrid, 28049, Spain.
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24
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Leret S, Pouillon Y, Casado S, Navío C, Rubio Á, Pérez EM. Bimodal supramolecular functionalization of carbon nanotubes triggered by covalent bond formation. Chem Sci 2016; 8:1927-1935. [PMID: 28451307 PMCID: PMC5364655 DOI: 10.1039/c6sc03894h] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [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: 08/31/2016] [Accepted: 11/01/2016] [Indexed: 01/15/2023] Open
Abstract
Many applications of carbon nanotubes require their chemical functionalization. Both covalent and supramolecular approaches have been extensively investigated. A less trodden path is the combination of both covalent and noncovalent chemistries, where the formation of covalent bonds triggers a particularly stable noncovalent interaction with the nanotubes. We describe a series of naphthalene diimide (NDI) bisalkene molecules that, upon mixing with single-walled carbon nanotubes (SWNTs) and Grubbs' catalyst, undergo two different reaction pathways. On one hand, they ring-close around the SWNTs to form rotaxane-like mechanically interlocked derivatives of SWNTs (MINTs). Alternatively, they oligomerize and then wrap around the SWNTs. The balance of MINTs to oligomer-wrapped SWNTs depends on the affinity of the NDI molecules for the SWNTs and the kinetics of the metathesis reactions, which can be controlled by varying the solvent. Thorough characterization of the products (TGA, TEM, AFM, Raman, UV-vis-NIR, PLE, XPS and UPS) confirms their structure and shows that each type of functionalization affects the electronic properties of the SWNTs differently.
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Affiliation(s)
- Sofía Leret
- IMDEA Nanociencia , Ciudad Universitaria de Cantoblanco , C/Faraday 9 , 28049 , Madrid , Spain .
| | - Yann Pouillon
- Departamento de Física de Materiales , Facultad de Químicas , UPV/EHU , San Sebastián , Spain
| | - Santiago Casado
- IMDEA Nanociencia , Ciudad Universitaria de Cantoblanco , C/Faraday 9 , 28049 , Madrid , Spain .
| | - Cristina Navío
- IMDEA Nanociencia , Ciudad Universitaria de Cantoblanco , C/Faraday 9 , 28049 , Madrid , Spain .
| | - Ángel Rubio
- Departamento de Física de Materiales , Facultad de Químicas , UPV/EHU , San Sebastián , Spain.,Max Planck Institute for the Structure and Dynamics of Matter (MPSD) , Luruper Chaussee 149 , 22761 Hamburg , Germany
| | - Emilio M Pérez
- IMDEA Nanociencia , Ciudad Universitaria de Cantoblanco , C/Faraday 9 , 28049 , Madrid , Spain .
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25
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Encinar M, Casado S, Calzado-Martín A, Natale P, San Paulo Á, Calleja M, Vélez M, Monroy F, López-Montero I. Nanomechanical properties of composite protein networks of erythroid membranes at lipid surfaces. Colloids Surf B Biointerfaces 2016; 149:174-183. [PMID: 27764687 DOI: 10.1016/j.colsurfb.2016.10.022] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2016] [Revised: 10/11/2016] [Accepted: 10/12/2016] [Indexed: 11/30/2022]
Abstract
Erythrocyte membranes have been particularly useful as a model for studies of membrane structure and mechanics. Native erythroid membranes can be electroformed as giant unilamellar vesicles (eGUVs). In the presence of ATP, the erythroid membrane proteins of eGUVs rearrange into protein networks at the microscale. Here, we present a detailed nanomechanical study of individual protein microfilaments forming the protein networks of eGUVs when spread on supporting surfaces. Using Peak Force tapping Atomic Force Microscopy (PF-AFM) in liquid environment we have obtained the mechanical maps of the composite lipid-protein networks supported on solid surface. In the absence of ATP, the protein pool was characterized by a Young's Modulus Epool≈5-15MPa whereas the complex filaments were found softer after protein supramolecular rearrangement; Efil≈0.4MPa. The observed protein softening and reassembling could be relevant for understanding the mechanisms of cytoskeleton reorganization found in pathological erythrocytes or erythrocytes that are affected by biological agents.
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Affiliation(s)
- Mario Encinar
- Instituto de Microelectrónica de Madrid, CSIC, 28760 Tres Cantos, Spain
| | - Santiago Casado
- IMDEA Nanociencia, Ciudad Universitaria de Cantoblanco, 28049 Madrid, Spain
| | | | - P Natale
- Dpt. Physical Chemistry I, Universidad Complutense de Madrid, 28040 Madrid, Spain; Instituto de Investigación Hospital Doce de Octubre (i+12), 28041 Madrid, Spain
| | - Álvaro San Paulo
- Instituto de Microelectrónica de Madrid, CSIC, 28760 Tres Cantos, Spain
| | | | - Marisela Vélez
- IMDEA Nanociencia, Ciudad Universitaria de Cantoblanco, 28049 Madrid, Spain; Instituto de Catálisis y Petroleoquímica, CSIC, Ciudad Universitaria de Cantoblanco, 28049 Madrid, Spain
| | - Francisco Monroy
- Dpt. Physical Chemistry I, Universidad Complutense de Madrid, 28040 Madrid, Spain; Instituto de Investigación Hospital Doce de Octubre (i+12), 28041 Madrid, Spain.
| | - Iván López-Montero
- Dpt. Physical Chemistry I, Universidad Complutense de Madrid, 28040 Madrid, Spain; Instituto de Investigación Hospital Doce de Octubre (i+12), 28041 Madrid, Spain.
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26
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Smirnov JRC, Zhang Q, Wannemacher R, Wu L, Casado S, Xia R, Rodriguez I, Cabanillas-González J. Flexible all-polymer waveguide for low threshold amplified spontaneous emission. Sci Rep 2016; 6:34565. [PMID: 27686745 PMCID: PMC5043348 DOI: 10.1038/srep34565] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [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: 05/05/2016] [Accepted: 09/15/2016] [Indexed: 11/09/2022] Open
Abstract
The fabrication of all polymer optical waveguides, based on a highly fluorescent conjugated polymer (CP) poly(9,9-dioctylfluorene-alt-benzothiadiazole) (F8BT) and a mechanically flexible and biodegradable polymer, cellulose acetate (CA), is reported. The replication by hot embossing of patterned surfaces in CA substrates, onto which high quality F8BT films can be easily processed by spin coating, is exploited to produce an entirely plastic device that exhibits low optical loss and low threshold for amplified spontaneous emission (ASE). As a result, highly transparent and flexible waveguides are obtained, with excellent optical properties that remain unaltered after bending, allowing them to be adapted in various flexible photonic devices.
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Affiliation(s)
- José R Castro Smirnov
- Madrid Institute for Advanced Studies in Nanoscience, IMDEA Nanociencia, Calle Faraday 9, Ciudad Universitaria de, Cantoblanco, 28049, Spain
| | - Qi Zhang
- Key Laboratory for Organic Electronics and Information Displays &Institute of Advanced Materials, National Jiangsu Synergistic Innovation Center for Advanced Materials (SICAM), Nanjing University of Posts and Telecommunications, 9 Wenyuan Road, Nanjing 210046, P.R. China
| | - Reinhold Wannemacher
- Madrid Institute for Advanced Studies in Nanoscience, IMDEA Nanociencia, Calle Faraday 9, Ciudad Universitaria de, Cantoblanco, 28049, Spain
| | - Longfei Wu
- Madrid Institute for Advanced Studies in Nanoscience, IMDEA Nanociencia, Calle Faraday 9, Ciudad Universitaria de, Cantoblanco, 28049, Spain
| | - Santiago Casado
- Madrid Institute for Advanced Studies in Nanoscience, IMDEA Nanociencia, Calle Faraday 9, Ciudad Universitaria de, Cantoblanco, 28049, Spain
| | - Ruidong Xia
- Key Laboratory for Organic Electronics and Information Displays &Institute of Advanced Materials, National Jiangsu Synergistic Innovation Center for Advanced Materials (SICAM), Nanjing University of Posts and Telecommunications, 9 Wenyuan Road, Nanjing 210046, P.R. China
| | - Isabel Rodriguez
- Madrid Institute for Advanced Studies in Nanoscience, IMDEA Nanociencia, Calle Faraday 9, Ciudad Universitaria de, Cantoblanco, 28049, Spain
| | - Juan Cabanillas-González
- Madrid Institute for Advanced Studies in Nanoscience, IMDEA Nanociencia, Calle Faraday 9, Ciudad Universitaria de, Cantoblanco, 28049, Spain
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27
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Casado F, Teruel JA, Casado S, Ortiz A, Rodríguez-López JN, Aranda FJ. Location and Effects of an Antitumoral Catechin on the Structural Properties of Phosphatidylethanolamine Membranes. Molecules 2016; 21:molecules21070829. [PMID: 27347914 PMCID: PMC6274109 DOI: 10.3390/molecules21070829] [Citation(s) in RCA: 4] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2016] [Revised: 06/21/2016] [Accepted: 06/22/2016] [Indexed: 01/15/2023] Open
Abstract
Green tea catechins exhibit high diversity of biological effects including antioncogenic properties, and there is enormous interest in their potential use in the treatment of a number of pathologies. It is recognized that the mechanism underlying the activity of catechins relay in part in processes related to the membrane, and many studies revealed that the ability of catechins to interact with lipids plays a probably necessary role in their mechanism of action. We present in this work the characterization of the interaction between an antitumoral synthetically modified catechin (3-O-(3,4,5-trimethoxybenzoyl)-(-)-catechin, TMCG) and dimiristoylphosphatidyl-ethanolamine (DMPE) membranes using an array of biophysical techniques which include differential scanning calorimetry, X-ray diffraction, infrared spectroscopy, atomic force microscopy, and molecular dynamics simulations. We found that TMCG incorporate into DMPE bilayers perturbing the thermotropic transition from the gel to the fluid state forming enriched domains which separated into different gel phases. TMCG does not influence the overall bilayer assembly of phosphatidylethanolamine systems but it manages to influence the interfacial region of the membrane and slightly decrease the interlamellar repeat distance of the bilayer. TMCG seems to be located in the interior of the phosphatidylethanolamine bilayer with the methoxy groups being in the deepest position and some portion of the molecule interacting with the water interface. We believe that the reported interactions are significant not only from the point of view of the known antitumoral effect of TMCG, but also might contribute to understanding the basic molecular mechanism of the biological effects of the catechins found at the membrane level.
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Affiliation(s)
- Francisco Casado
- Departamento de Bioquímica y Biología Molecular-A, Universidad de Murcia, Campus de Espinardo, Murcia E-30100, Spain.
| | - José A Teruel
- Departamento de Bioquímica y Biología Molecular-A, Universidad de Murcia, Campus de Espinardo, Murcia E-30100, Spain.
| | - Santiago Casado
- IMDEA-Nanoscience, Campus de Cantoblanco, Madrid E-28049, Spain.
| | - Antonio Ortiz
- Departamento de Bioquímica y Biología Molecular-A, Universidad de Murcia, Campus de Espinardo, Murcia E-30100, Spain.
| | - José N Rodríguez-López
- Departamento de Bioquímica y Biología Molecular-A, Universidad de Murcia, Campus de Espinardo, Murcia E-30100, Spain.
| | - Francisco J Aranda
- Departamento de Bioquímica y Biología Molecular-A, Universidad de Murcia, Campus de Espinardo, Murcia E-30100, Spain.
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28
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Jurado R, Castello F, Bondia P, Casado S, Flors C, Cuesta R, Domínguez-Vera JM, Orte A, Gálvez N. Apoferritin fibers: a new template for 1D fluorescent hybrid nanostructures. Nanoscale 2016; 8:9648-9656. [PMID: 27103107 DOI: 10.1039/c6nr01044j] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Recently, research in the field of protein amyloid fibers has gained great attention due to the use of these materials as nanoscale templates for the construction of functional hybrid materials. The formation of apoferritin amyloid-like protein fibers is demonstrated herein for the first time. The morphology, size and stiffness of these one-dimensional structures are comparable to the fibers formed by β-lactoglobulin, a protein frequently used as a model in the study of amyloid-like fibrillar proteins. Nanometer-sized globular apoferritin is capable of self-assembling to form 1D micrometer-sized structures after being subjected to a heating process. Depending on the experimental conditions, fibers with different morphologies and sizes are obtained. The wire-like protein structure is rich in functional groups and allows chemical functionalization with diverse quantum dots (QD), as well as with different Alexa Fluor (AF) dyes, leading to hybrid fluorescent fibers with variable emission wavelengths, from green to near infrared, depending on the QD and AFs coupled. For fibers containing the pair AF488 and AF647, efficient fluorescence energy transfer from the covalently coupled donor (AF488) to acceptor tags (AF647) takes place. Apoferritin fibers are proposed here as a new promising template for obtaining hybrid functional materials.
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Affiliation(s)
- Rocío Jurado
- Department of Inorganic Chemistry, University of Granada, Avda. Fuentenueva, Granada, 18071, Spain.
| | - Fabio Castello
- Department of Physical Chemistry, Faculty of Pharmacy, University of Granada, Granada, 18071, Spain.
| | | | | | | | - Rafael Cuesta
- Department of Organic and Inorganic Chemistry, EPS Linares, University of Jaén, 28 Alfonso X El Sabio, Linares, 23700, Spain
| | - José M Domínguez-Vera
- Department of Inorganic Chemistry, University of Granada, Avda. Fuentenueva, Granada, 18071, Spain.
| | - Angel Orte
- Department of Physical Chemistry, Faculty of Pharmacy, University of Granada, Granada, 18071, Spain.
| | - Natividad Gálvez
- Department of Inorganic Chemistry, University of Granada, Avda. Fuentenueva, Granada, 18071, Spain.
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29
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Pedraz P, Casado S, Rodriguez V, Giordano MC, Mongeot FBD, Ayuso-Sacido A, Gnecco E. Adhesion modification of neural stem cells induced by nanoscale ripple patterns. Nanotechnology 2016; 27:125301. [PMID: 26889870 DOI: 10.1088/0957-4484/27/12/125301] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We have studied the influence of anisotropic nanopatterns (ripples) on the adhesion and morphology of mouse neural stem cells (C17.2) on glass substrates using cell viability assay, optical microscopy and atomic force microscopy. The ripples were produced by defocused ion beam sputtering with inert Ar ions, which physically remove atoms from the surface at the energy of 800 eV. The ripple periodicity (∼200 nm) is comparable to the thickness of the cytoplasmatic microspikes (filopodia) which link the stem cells to the substrate. All methods show that the cell adhesion is significantly lowered compared to the same type of cells on flat glass surfaces. Furthermore, the AFM analysis reveals that the filopodia tend to be trapped parallel or perpendicular to the ripples, which limits the spreading of the stem cell on the rippled substrate. This opens the perspective of controlling the micro-adhesion of stem cells and the orientation of their filopodia by tuning the anisotropic substrate morphology without chemical reactions occurring at the surface.
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Affiliation(s)
- P Pedraz
- IMDEA Nanociencia, Campus Universitario de Cantoblanco, Calle Faraday 9, E-28049 Madrid, Spain
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30
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Mejias SH, Couleaud P, Casado S, Granados D, Garcia MA, Abad JM, Cortajarena AL. Assembly of designed protein scaffolds into monolayers for nanoparticle patterning. Colloids Surf B Biointerfaces 2016; 141:93-101. [PMID: 26844645 DOI: 10.1016/j.colsurfb.2016.01.039] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2015] [Revised: 12/01/2015] [Accepted: 01/20/2016] [Indexed: 10/22/2022]
Abstract
The controlled assembly of building blocks to achieve new nanostructured materials with defined properties at different length scales through rational design is the basis and future of bottom-up nanofabrication. This work describes the assembly of the idealized protein building block, the consensus tetratricopeptide repeat (CTPR), into monolayers by oriented immobilization of the blocks. The selectivity of thiol-gold interaction for an oriented immobilization has been verified by comparing a non-thiolated protein building block. The physical properties of the CTPR protein thin biomolecular films including topography, thickness, and viscoelasticity, are characterized. Finally, the ability of these scaffolds to act as templates for inorganic nanostructures has been demonstrated by the formation of well-packed gold nanoparticles (GNPs) monolayer patterned by the CTPR monolayer.
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Affiliation(s)
- Sara H Mejias
- IMDEA-Nanociencia and Centro Nacional de Biotecnología (CNB-CSIC)-IMDEA Nanociencia Associated Unit, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain
| | - Pierre Couleaud
- IMDEA-Nanociencia and Centro Nacional de Biotecnología (CNB-CSIC)-IMDEA Nanociencia Associated Unit, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain
| | - Santiago Casado
- IMDEA-Nanociencia and Centro Nacional de Biotecnología (CNB-CSIC)-IMDEA Nanociencia Associated Unit, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain
| | - Daniel Granados
- IMDEA-Nanociencia and Centro Nacional de Biotecnología (CNB-CSIC)-IMDEA Nanociencia Associated Unit, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain
| | - Miguel Angel Garcia
- Instituto de Cerámica y Vidrio (ICV-CSIC), Cantoblanco, 28049 Madrid, Spain; Instituto de Magnetismo Aplicado "Salvador Velayos", UCM-ADIF, 28230 Madrid, Spain
| | - Jose M Abad
- IMDEA-Nanociencia and Centro Nacional de Biotecnología (CNB-CSIC)-IMDEA Nanociencia Associated Unit, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain; Departamento de Química Analítica y Análisis Instrumental, Facultad de Ciencias, Universidad Autónoma de Madrid, 28049 Madrid, Spain.
| | - Aitziber L Cortajarena
- IMDEA-Nanociencia and Centro Nacional de Biotecnología (CNB-CSIC)-IMDEA Nanociencia Associated Unit, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain; CIC BiomaGUNE, Parque Tecnológico de San Sebastián, Paseo Miramón 182, Donostia-San Sebastián 20009, Spain.
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31
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Wu L, Casado S, Romero B, Otón JM, Morgado J, Müller C, Xia R, Cabanillas-Gonzalez J. Ground State Host–Guest Interactions upon Effective Dispersion of Regioregular Poly(3-hexylthiophene) in Poly(9,9-dioctylfluorene-alt-benzothiadiazole). Macromolecules 2015. [DOI: 10.1021/acs.macromol.5b02111] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Longfei Wu
- Madrid
Institute for Advanced Studies in Nanoscience, IMDEA Nanociencia, Calle
Faraday 9, Ciudad Universitaria de Cantoblanco 28049, Spain
| | - Santiago Casado
- Madrid
Institute for Advanced Studies in Nanoscience, IMDEA Nanociencia, Calle
Faraday 9, Ciudad Universitaria de Cantoblanco 28049, Spain
| | - Beatriz Romero
- Escuela
de Ciencias Experimentales y Tecnología, Universidad Rey Juan Carlos, calle Tulipán s/n, 28933 Móstoles, Spain
| | - Jose Manuel Otón
- CEMDATIC,
Escuela Técnica Superior de Ingenieros de Telecomunicación, Universidad Politécnica de Madrid, Av. Complutense 30, 28040 Madrid, Spain
| | - Jorge Morgado
- Instituto de Telecomunicações, Av. Rovisco Pais, P-1049-001 Lisboa, Portugal
- Department
of Bioengineering, Instituto Superior Técnico, Universidade de Lisboa, Avenida Rovisco Pais, P-1049-001 Lisboa, Portugal
| | - Christian Müller
- Department
of Chemistry and Chemical Engineering, Chalmers University of Technology, 41296 Göteborg, Sweden
| | - Ruidong Xia
- Key Laboratory for Organic Electronics and Information Displays & Institute of Advanced Materials, National Jiangsu Synergistic Innovation Center for Advanced Materials (SICAM), Nanjing University of Posts and Telecommunications, 9 Wenyuan Road, Nanjing 210046, P.R., China
| | - Juan Cabanillas-Gonzalez
- Madrid
Institute for Advanced Studies in Nanoscience, IMDEA Nanociencia, Calle
Faraday 9, Ciudad Universitaria de Cantoblanco 28049, Spain
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32
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López-Andarias J, Rodriguez MJ, Atienza C, López JL, Mikie T, Casado S, Seki S, Carrascosa JL, Martín N. Highly Ordered n/p-Co-assembled Materials with Remarkable Charge Mobilities. J Am Chem Soc 2015; 137:893-7. [DOI: 10.1021/ja510946c] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Javier López-Andarias
- Departamento
de Química Orgánica I, Facultad de Ciencias Química, Universidad Complutense, E-28040 Madrid, Spain
| | | | - Carmen Atienza
- Departamento
de Química Orgánica I, Facultad de Ciencias Química, Universidad Complutense, E-28040 Madrid, Spain
| | - Juan Luis López
- Departamento
de Química Orgánica I, Facultad de Ciencias Química, Universidad Complutense, E-28040 Madrid, Spain
| | - Tsubasa Mikie
- Department
of Applied Chemistry, Graduate School of Engineering, Osaka University, Osaka 565-0871, Japan
| | - Santiago Casado
- IMDEA-Nanoscience, Campus de Cantoblanco, E-28049 Madrid, Spain
| | - Shu Seki
- Department
of Applied Chemistry, Graduate School of Engineering, Osaka University, Osaka 565-0871, Japan
| | - José L. Carrascosa
- Centro
Nacional de Biotecnología (CNB), CSIC, E-28049 Madrid, Spain
- IMDEA-Nanoscience, Campus de Cantoblanco, E-28049 Madrid, Spain
| | - Nazario Martín
- Departamento
de Química Orgánica I, Facultad de Ciencias Química, Universidad Complutense, E-28040 Madrid, Spain
- IMDEA-Nanoscience, Campus de Cantoblanco, E-28049 Madrid, Spain
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33
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Gnecco E, Nita P, Casado S, Pimentel C, Mougin K, Giordano MC, Repetto D, de Mongeot FB. Channeling motion of gold nanospheres on a rippled glassed surface. Nanotechnology 2014; 25:485302. [PMID: 25396680 DOI: 10.1088/0957-4484/25/48/485302] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Gold nanospheres have been manipulated by atomic force microscopy on a rippled glass surface produced by ion beam sputtering and coated with an ultrathin (10 nm thick) graphitic layer. This substrate is characterized by irregular wavy grooves running parallel to a preferential direction. Measurements in ambient conditions show that the motion of the nanoparticles is confined to single grooves ('channels'), along which the particles move till they are trapped by local bottlenecks. At this point, the particles cross the ripple pattern in a series of consecutive jumps and continue their longitudinal motion along a different channel. Moreover, due to the asymmetric shape of the ripple profiles, the jumps occur in the direction of minimum slope, resembling a ratchet mechanism. Our results are discussed, extending a collisional model, which was recently developed for the manipulation of nanospheres on flat surfaces, to the specific geometry of this problem.
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Affiliation(s)
- Enrico Gnecco
- Instituto Madrileño de Estudios Avanzados en Nanociencia (IMDEA Nanociencia), Campus Universitario de Cantoblanco, Calle Faraday 9, 28049 Madrid, Spain
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Qian Y, Wei Q, Del Pozo G, Mróz MM, Lüer L, Casado S, Cabanillas-Gonzalez J, Zhang Q, Xie L, Xia R, Huang W. H-shaped oligofluorenes for highly air-stable and low-threshold non-doped deep blue lasing. Adv Mater 2014; 26:2937-2942. [PMID: 24665075 DOI: 10.1002/adma.201305355] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2013] [Revised: 11/23/2013] [Indexed: 06/03/2023]
Abstract
H-shaped oligofluorenes as gain media exhibit excellent photo- (large robustness against oxidation) and thermal stabilities in ambient atmosphere for large σe and low-threshold (0.22 nJ pulse(-1) ) deep blue distributed feedback (DFB) lasers. Their amplified spontaneous emission (ASE) thresholds increase less than 3-fold and the emission spectra exhibit almost no shift with film samples annealed up to 200 °C in open air.
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Affiliation(s)
- Yan Qian
- Key Laboratory for Organic Electronics & Information Displays (KLOEID), Jiangsu-Singapore Joint Research Center for Organic/Bio Electronics & Information Displays, Institute of Advanced Materials (IAM), Nanjing University of Posts and Telecommunications, 9 Wenyuan Road, Nanjing, 210046, P.R. China
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35
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de Juan A, Pouillon Y, Ruiz-González L, Torres-Pardo A, Casado S, Martín N, Rubio Á, Pérez EM. Mechanically Interlocked Single-Wall Carbon Nanotubes. Angew Chem Int Ed Engl 2014; 53:5394-400. [DOI: 10.1002/anie.201402258] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2014] [Indexed: 11/07/2022]
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36
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de Juan A, Pouillon Y, Ruiz-González L, Torres-Pardo A, Casado S, Martín N, Rubio Á, Pérez EM. Mechanically Interlocked Single-Wall Carbon Nanotubes. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201402258] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Abstract
Simultaneous localization and mapping (SLAM) methods provide real-time estimation of 3-D models from the sole input of a handheld camera, routinely in mobile robotics scenarios. Medical endoscopic sequences mimic a robotic scenario in which a handheld camera (monocular endoscope) moves along an unknown trajectory while observing an unknown cavity. However, the feasibility and accuracy of SLAM methods have not been extensively validated with human in vivo image sequences. In this work, we propose a monocular visual SLAM algorithm tailored to deal with medical image sequences in order to provide an up-to-scale 3-D map of the observed cavity and the endoscope trajectory at frame rate. The algorithm is validated over synthetic data and human in vivo sequences corresponding to 15 laparoscopic hernioplasties where accurate ground-truth distances are available. It can be concluded that the proposed procedure is: 1) noninvasive, because only a standard monocular endoscope and a surgical tool are used; 2) convenient, because only a hand-controlled exploratory motion is needed; 3) fast, because the algorithm provides the 3-D map and the trajectory in real time; 4) accurate, because it has been validated with respect to ground-truth; and 5) robust to inter-patient variability, because it has performed successfully over the validation sequences.
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38
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Monserrate A, Casado S, Flors C. Correlative Atomic Force Microscopy and Localization-Based Super-Resolution Microscopy: Revealing Labelling and Image Reconstruction Artefacts. Chemphyschem 2013; 15:647-50. [DOI: 10.1002/cphc.201300853] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2013] [Indexed: 11/10/2022]
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39
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Nita P, Casado S, Dietzel D, Schirmeisen A, Gnecco E. Spinning and translational motion of Sb nanoislands manipulated on MoS2. Nanotechnology 2013; 24:325302. [PMID: 23867216 DOI: 10.1088/0957-4484/24/32/325302] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Antimony nanoislands grown on a MoS2 surface in ultra-high vacuum have been manipulated by atomic force microscopy (AFM) in ambient conditions. The island profiles have been digitized and provided as an input to a collisional algorithm based on classical mechanics. Assuming that the islands are rigid and static friction is high enough to prevent further motion after the passage of the probing tip, the direction of motion and the angle of rotation of the islands have been reproduced numerically. For a given spacing between the scan lines, the angle of deflection with respect to the fast scan direction and the angular speed of the islands are expected to vary with the friction between islands and substrate. From a comparison between model and experiment a shear strength in the order of 0.2 MPa is estimated.
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Affiliation(s)
- Paweł Nita
- Instituto Madrileño de Estudios Avanzados en Nanociencia (IMDEA Nanociencia), Campus Universitario de Cantoblanco, Calle Faraday 9, E-28049 Madrid, Spain.
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40
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Varghese S, Park SK, Casado S, Fischer RC, Resel R, Milián-Medina B, Wannemacher R, Park SY, Gierschner J. Stimulated Emission Properties of Sterically Modified Distyrylbenzene-Based H-Aggregate Single Crystals. J Phys Chem Lett 2013; 4:1597-602. [PMID: 26282965 DOI: 10.1021/jz400659b] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
J-aggregation has been shown to be beneficial for light amplification in single crystals of π-conjugated organic molecules. In the case of H-aggregation, the criteria for such processes are still under debate. It has also been shown that H-aggregate arrangements with considerable π-π overlap are detrimental for light amplification. We show here that a proper alignment of the molecules in the crystal lattice, which minimizes π-π overlap between adjacent molecules, gives rise to (random) stimulated emission from cofacial arrangements similar to that of the herringbone aggregates.
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Affiliation(s)
- Shinto Varghese
- †Madrid Institute for Advanced Studies, IMDEA Nanoscience, Ciudad Universitaria de Cantoblanco, 28049, Madrid, Spain
| | - Sang Kyu Park
- ‡Center for Supramolecular Optoelectronic Materials and WCU Hybrid Materials Program, Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 151-744, Korea
| | - Santiago Casado
- †Madrid Institute for Advanced Studies, IMDEA Nanoscience, Ciudad Universitaria de Cantoblanco, 28049, Madrid, Spain
| | | | | | - Begoña Milián-Medina
- †Madrid Institute for Advanced Studies, IMDEA Nanoscience, Ciudad Universitaria de Cantoblanco, 28049, Madrid, Spain
| | - Reinhold Wannemacher
- †Madrid Institute for Advanced Studies, IMDEA Nanoscience, Ciudad Universitaria de Cantoblanco, 28049, Madrid, Spain
| | - Soo Young Park
- ‡Center for Supramolecular Optoelectronic Materials and WCU Hybrid Materials Program, Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 151-744, Korea
| | - Johannes Gierschner
- †Madrid Institute for Advanced Studies, IMDEA Nanoscience, Ciudad Universitaria de Cantoblanco, 28049, Madrid, Spain
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Malki M, Casado S, López MF, Caillard R, Palomares FJ, Gago JAM, Vaz-Domínguez C, Cuesta A, Amils R, Fernández VM, Velez M, De Lacey AL, Olea D. Physicochemical Characterization ofAcidiphiliumsp. Biofilms. Chemphyschem 2013; 14:1237-44. [DOI: 10.1002/cphc.201201034] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2012] [Indexed: 11/07/2022]
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42
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Ragoussi ME, Casado S, Ribeiro-Viana R, Torre GDL, Rojo J, Torres T. Selective carbohydrate–lectin interactions in covalent graphene- and SWCNT-based molecular recognition systems. Chem Sci 2013. [DOI: 10.1039/c3sc51352a] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
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Varghese S, Yoon SJ, Calzado EM, Casado S, Boj PG, Díaz-García MA, Resel R, Fischer R, Milián-Medina B, Wannemacher R, Park SY, Gierschner J. Stimulated resonance Raman scattering and laser oscillation in highly emissive distyrylbenzene-based molecular crystals. Adv Mater 2012; 24:6473-6478. [PMID: 23060051 DOI: 10.1002/adma.201202525] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2012] [Revised: 08/20/2012] [Indexed: 06/01/2023]
Abstract
Three-in-one: A novel distyrylbenzene-based material forms J-type aggregates in single crystals with highly polarized and bright red emission, giving rise to optical gain narrowing, for which different mechanisms (amplified spontaneous emission, laser emission and stimulated resonance Raman scattering) are observed. These are correlated with the favorable intrinsic and macroscopic properties of the crystal, in particular to the orientation of the molecules to the crystal surface.
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Affiliation(s)
- Shinto Varghese
- Instituto Madrileño de Estudios Avanzados (IMDEA Nanociencia), Ciudad Universitaria de Cantoblanco, Madrid 28049, Spain
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Villalonga R, Díez P, Casado S, Eguílaz M, Yáñez-Sedeño P, Pingarrón JM. Electropolymerized network of polyamidoamine dendron-coated gold nanoparticles as novel nanostructured electrode surface for biosensor construction. Analyst 2012; 137:342-8. [DOI: 10.1039/c1an15850c] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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45
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Salcher A, Nikolic MS, Casado S, Vélez M, Weller H, Juárez BH. CdSe/CdS nanoparticles immobilized on pNIPAm-based microspheres. ACTA ACUST UNITED AC 2010. [DOI: 10.1039/b917022g] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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46
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Casado S, González-Viñas W, Mancini H. Testing the Kibble-Zurek mechanism in Rayleigh-Bénard convection. Phys Rev E Stat Nonlin Soft Matter Phys 2006; 74:047101. [PMID: 17155216 DOI: 10.1103/physreve.74.047101] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2006] [Indexed: 05/12/2023]
Abstract
We report experimental evidence of the fact that, in an emerging Rayleigh-Bénard structure, the density of defects which appear scales as a power law in the rate of change of the control parameter. The scaling exponents agree with those calculated from the Kibble-Zurek mechanism. This is the first evidence to our knowledge that this mechanism works in a hydrodynamical system.
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Affiliation(s)
- S Casado
- Department of Physics and Applied Mathematics, Universidad de Navarra, Irunlarrea s/n, E-31080 Pamplona, Spain
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47
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Molero L, Carrasco C, Marques M, Vaziri ND, Mateos-Cáceres PJ, Casado S, Macaya C, Barrientos A, López-Farré AJ. Involvement of endothelium and endothelin-1 in lead-induced smooth muscle cell dysfunction in rats. Kidney Int 2006; 69:685-90. [PMID: 16395254 DOI: 10.1038/sj.ki.5000103] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Lead exposure induces dysfunction of the cyclic guanosine monophosphate-dependent vasodilator system through downregulation of soluble guanylate cyclase (sGC) expression. The endothelium not only releases vasodilators but also vasoconstrictors such as endothelin-1 (ET-1). Our aim was to explore the role of the vascular endothelium and ET-1 as possible mediators of lead-induced downregulation of sGC. Isolated aortic segments from Wistar Kyoto rats were incubated in the presence or absence of lead (1 parts per million) for 24 h. Endothelium was mechanically removed in some of the aorta segments. As reported previously, lead exposure induced downregulation of sGC protein expression in the intact aortic segments. However, lead exposure failed to significantly modify sGC-beta1 subunit expression in the endothelium-denuded aortic segments. Incubation with a selective ETA-type receptor inhibitor, BQ-123 (10(-6) mol/l), restored sGC protein expression in lead-exposed intact aortic segments. As it has also been previously observed, incubation in lead-containing medium resulted in the upregulation of cyclooxygenase-2 (COX-2) in the intact aortic segments. Denudation of endothelium partially abrogated this effect of lead. Incubation with BQ-123 prevented the lead-induced upregulation COX-2 in the intact aortic segments. However, neither ET-1 content nor ETA-type receptor expression were modified by lead exposure of the aortic segments. As conclusion, the endothelium through the activation of ETA-type receptors mediates the downregulation of sGC expression by lead in the vascular wall.
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MESH Headings
- Animals
- Antihypertensive Agents/pharmacology
- Aorta
- Blotting, Western
- Cyclooxygenase 2/analysis
- Cyclooxygenase 2/genetics
- Down-Regulation
- Endothelin A Receptor Antagonists
- Endothelin-1/analysis
- Endothelin-1/physiology
- Endothelium, Vascular/chemistry
- Endothelium, Vascular/physiopathology
- Guanylate Cyclase/genetics
- Guanylate Cyclase/metabolism
- In Vitro Techniques
- Lead/pharmacology
- Male
- Membrane Proteins/analysis
- Membrane Proteins/genetics
- Muscle, Smooth, Vascular/cytology
- Muscle, Smooth, Vascular/drug effects
- Muscle, Smooth, Vascular/physiology
- Myocytes, Smooth Muscle/drug effects
- Myocytes, Smooth Muscle/physiology
- Peptides, Cyclic/pharmacology
- Rats
- Rats, Inbred WKY
- Receptor, Endothelin A/analysis
- Receptor, Endothelin A/physiology
- Vasodilation/physiology
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Affiliation(s)
- L Molero
- Cardiovascular Research Unit, Hospital Clínico San Carlos, Madrid, Spain, and Department of Medicine, University of California, Irvine, USA
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48
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Baonza VG, Taravillo M, Cazorla A, Casado S, Cáceres M. n-pentanol at high pressures: Rotational isomerism in the liquid phase and the liquid-solid phase transition. J Chem Phys 2006; 124:044508. [PMID: 16460186 DOI: 10.1063/1.2149855] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The vibrational spectrum of liquids constituted of chain molecules is difficult to analyze because it may have contributions of different rotational isomers. In turn, with a proper vibrational assignment, this feature allows us to extract information about the effect of temperature or pressure on the molecular conformations in the liquid state. In this regard, the information on the vibrational spectrum in the solid phase greatly simplifies the vibrational analysis of the different rotational conformers existing in the liquid, as the molecules usually present all-trans conformations in the crystalline state. Here we report room-temperature Raman experiments on n-pentanol performed in a sapphire-anvil cell up to 3 GPa. A detailed analysis of the liquid-solid phase transition occurring at 1.3 GPa is provided. The analysis of the Raman spectrum in the solid phase allows the identification of the bands due to the different rotational isomers present in the liquid. The analysis of the spectral region corresponding to skeletal vibrations of the carbon chain (800-1200 cm(-1)) indicates that gauche conformers are promoted by the application of pressure. The analysis of the intensity ratio of those bands assigned to trans and gauge conformations is used to calculate the change in molecular volume ascribed to the trans-gauge isomerization process. We find a value similar to that found in n-alkanes, i.e., -0.88 cm(3) mol(-1). In addition, we find indication that pressure varies the proportions of the different gauge conformers. Thus, it appears that the GTTt to TGTt transition in the carbon chain is favored at high pressures. As expected, a smaller change in the molecular volume accompanies this conformation change.
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Affiliation(s)
- V G Baonza
- Departamento de Química Física I, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, 28040 Madrid, Spain.
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49
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Babín M, Casado S, Chana A, Herradón B, Segner H, Tarazona JV, Navas JM. Cytochrome P4501A induction caused by the imidazole derivative Prochloraz in a rainbow trout cell line. Toxicol In Vitro 2005; 19:899-902. [PMID: 16095870 DOI: 10.1016/j.tiv.2005.06.037] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2005] [Accepted: 06/17/2005] [Indexed: 11/23/2022]
Abstract
A variety of aquatic pollutants are able to induce cytochrome P4501A (CYP1A) in fish by ligand binding to the aryl hydrocarbon receptor (AhR). High-affinity AhR ligands are planar aromatic polycyclic molecules such as the prototypical ligand, 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD). The present work investigates the ability of the imidazole derivative, Prochloraz (PRO), to induce CYP1A. Computational studies on the molecular structure of PRO indicated that it is highly unlikely for PRO to have both aromatic rings of the molecule, i.e. the imidazole and the benzene ring, in the same plane. Thus, the possible conformers do not take planar structures, in contrast to the typically planar AhR ligands. Experimentally, the capability of PRO to induce CYP1A was assessed using the rainbow trout liver cell line, RTL-W1, as in vitro model. PRO increased in a concentration-dependent way the catalytic activity of CYP1A (determined as 7-ethoxyresorufin-O-deethylase, EROD, activity) in RTL-W1 cells. The potency of PRO was lower than that of a reference AhR-ligand, beta-naphthoflavone (betaNF). In addition to the catalytic level, PRO activated CYP1A also at the transcriptional level as determined by RT-PCR analysis of CYP1A mRNA. These results indicate that PRO, although its structure is not corresponding to the typical features of CYP1A-inducing AhR ligands, still is able to activate CYP1A expression.
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Affiliation(s)
- M Babín
- Department of the Environment, INIA, Ctra. de la Coruña, Km. 7, E-28040 Madrid, Spain
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50
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Ortiz A, Ríos F, Melero R, Reyero A, Gazapo R, Casado S. [Experience with sevelamer in peritoneal dialysis]. Nefrologia 2003; 23:432-6. [PMID: 14658169] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/27/2023] Open
Abstract
BACKGROUND Sevelamer is a non-absorbable phosphorus chelator that is not a source of aluminium, calcium or base. The clinical experience with sevelamer in peritoneal dialysis and in daily clinical practice is scarce. The aim of this study is to evaluate the results of therapy of hyperphosphoremia with sevelamer on serum phosphorus and phosphorus chelators requirements, in a peritoneal dialysis clinical practice. METHODS Sevalamer 400 mg was prescribed to peritoneal dialysis patients with hyperphosphoremia who were treated with aluminium hydroxide or with calcium salts in the absence of hypocalcemia. Fourteen patients completed 12 months of therapy. RESULTS The initial sevelamer dose was 2,280 +/- 760 mg/day, and was increased to 2,760 +/- 1,160 mg/day at 12 months. At 12 months no patient was on aluminium salts and calcium salts had been significantly reduced. Phosphoremia (5.9 +/- 0.6 to 5.0 +/- 1.4 mg/dL, p = 0.049), calcium-phosphorus product (59.8 +/- 5.8 to 48.6 +/- 12.5 mg2/dL2, p = 0.01) and serum cholesterol (191 +/- 29 to 167 +/- 33 mg/dL, p = 0.02) decreased at 12 months. No significant changes were observed in serum triglycerides, total CO2 or PTH. Serum alkaline phosphatase increased at 6 months, but values returned to normal at 12 months. No changes were observed in serum gamma-glutamyl-transpeptidase. Five patients were started on 1.25 (OH)2 vitamin D therapy. CONCLUSION In peritoneal dialysis patients, sevelamer allows a satisfactory control of serum phosphorus levels and calcium-phosphorus product, while decreasing the amount of aluminium and calcium salts prescribed.
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Affiliation(s)
- A Ortiz
- Fundación Jiménez Díaz, Madrid
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