Base de dados : MEDLINE
Pesquisa : G01.590 [Categoria DeCS]
Referências encontradas : 4017 [refinar]
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  1 / 4017 MEDLINE  
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[PMID]:29444050
[Au] Autor:Pugliese D; Konstantaki M; Konidakis I; Ceci-Ginistrelli E; Boetti NG; Milanese D; Pissadakis S
[Ti] Título:Bioresorbable optical fiber Bragg gratings.
[So] Source:Opt Lett;43(4):671-674, 2018 Feb 15.
[Is] ISSN:1539-4794
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:We demonstrate, for the first time, an inscription and wet dissolution study of Bragg gratings in a bioresorbable calcium-phosphate glass optical fiber. Bragg gratings, with average refractive index changes of 5.8×10 , were inscribed using 193 nm excimer laser radiation. Results on the dissolution of the irradiated fiber in simulated physiological conditions are presented after immersing a tilted Bragg grating in a phosphate buffered saline solution for 56 h; selective chemical etching effects are also reported. The investigations performed pave the way toward the use of such phosphate glass fiber Bragg gratings for the development of soluble photonic sensing probes for the efficient in vivo monitoring of vital mechanical or chemical parameters.
[Mh] Termos MeSH primário: Fosfatos de Cálcio/química
Fosfatos de Cálcio/metabolismo
Fibras Ópticas
Fenômenos Ópticos
[Mh] Termos MeSH secundário: Vidro/química
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Calcium Phosphates); 97Z1WI3NDX (calcium phosphate)
[Em] Mês de entrada:1802
[Cu] Atualização por classe:180226
[Lr] Data última revisão:
180226
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:180215
[St] Status:MEDLINE
[do] DOI:10.1364/OL.43.000671


  2 / 4017 MEDLINE  
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[PMID]:29401953
[Au] Autor:Poulin C; Antoine D; Huot Y
[Ti] Título:Diurnal variations of the optical properties of phytoplankton in a laboratory experiment and their implication for using inherent optical properties to measure biomass.
[So] Source:Opt Express;26(2):711-729, 2018 Jan 22.
[Is] ISSN:1094-4087
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Diurnal variations of phytoplankton size distributions, chlorophyll, carbon and nitrogen content, in vivo fluorescence and associated optical absorption and scattering properties were observed in the laboratory to help understand in situ and spatial observations. We grew triplicate semi-continuous cultures of T. pseudonana, D. tertiolecta, P. tricornutum and E. huxleyi under a sinusoidal light regime. We observed diurnal variations in the particulate absorption (a ), scattering (b ), attenuation (c ), and backscattering coefficients (b ), which correlate with carbon and Chl concentrations. Relative variations from sunrise of b are slightly lower than those of c , suggesting that b diurnal increases observed in nature are partly caused by phytoplankton. Non-concurrent changes of carbon and Chl-specific backscattering and scattering coefficients and optical cross-sections however indicates that using backscattering to infer scattering or biomass must be done with care.
[Mh] Termos MeSH primário: Biomassa
Ritmo Circadiano
Fenômenos Ópticos
Fitoplâncton/crescimento & desenvolvimento
[Mh] Termos MeSH secundário: Carbono/análise
Clorofila/análise
Iluminação
Nitrogênio/análise
Fitoplâncton/química
Espalhamento de Radiação
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
1406-65-1 (Chlorophyll); 7440-44-0 (Carbon); N762921K75 (Nitrogen)
[Em] Mês de entrada:1802
[Cu] Atualização por classe:180208
[Lr] Data última revisão:
180208
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:180207
[St] Status:MEDLINE
[do] DOI:10.1364/OE.26.000711


  3 / 4017 MEDLINE  
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[PMID]:29212007
[Au] Autor:Wijesinghe P; Johansen NJ; Curatolo A; Sampson DD; Ganss R; Kennedy BF
[Ad] Endereço:BRITElab, Harry Perkins Institute of Medical Research, QEII Medical Centre, Nedlands and Centre for Medical Research, The University of Western Australia, Perth, Western Australia, Australia; Optical+Biomedical Engineering Laboratory, School of Electrical, Electronic and Computer Engineering, The Un
[Ti] Título:Ultrahigh-Resolution Optical Coherence Elastography Images Cellular-Scale Stiffness of Mouse Aorta.
[So] Source:Biophys J;113(11):2540-2551, 2017 Dec 05.
[Is] ISSN:1542-0086
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Cellular-scale imaging of the mechanical properties of tissue has helped to reveal the origins of disease; however, cellular-scale resolution is not readily achievable in intact tissue volumes. Here, we demonstrate volumetric imaging of Young's modulus using ultrahigh-resolution optical coherence elastography, and apply it to characterizing the stiffness of mouse aortas. We achieve isotropic resolution of better than 15 µm over a 1-mm lateral field of view through the entire depth of an intact aortic wall. We employ a method of quasi-static compression elastography that measures volumetric axial strain and uses a compliant, transparent layer to measure surface axial stress. This combination is used to estimate Young's modulus throughout the volume. We demonstrate differentiation by stiffness of individual elastic lamellae and vascular smooth muscle. We observe stiffening of the aorta in regulator of G protein signaling 5-deficient mice, a model that is linked to vascular remodeling and fibrosis. We observe increased stiffness with proximity to the heart, as well as regions with micro-structural and micro-mechanical signatures characteristic of fibrous and lipid-rich tissue. High-resolution imaging of Young's modulus with optical coherence elastography may become an important tool in vascular biology and in other fields concerned with understanding the role of mechanics within the complex three-dimensional architecture of tissue.
[Mh] Termos MeSH primário: Aorta/diagnóstico por imagem
Aorta/fisiologia
Técnicas de Imagem por Elasticidade
Fenômenos Ópticos
Razão Sinal-Ruído
Rigidez Vascular
[Mh] Termos MeSH secundário: Animais
Aorta/metabolismo
Masculino
Camundongos
Camundongos Endogâmicos C57BL
Proteínas RGS/deficiência
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (RGS Proteins); 0 (Rgs5 protein, mouse)
[Em] Mês de entrada:1801
[Cu] Atualização por classe:180103
[Lr] Data última revisão:
180103
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171207
[St] Status:MEDLINE


  4 / 4017 MEDLINE  
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[PMID]:28452339
[Au] Autor:Stockhoff M; Jan S; Dubois A; Cherry SR; Roncali E
[Ad] Endereço:Department of Biomedical Engineering, University of California Davis, One Shields Avenue, Davis, CA 95616, United States of America.
[Ti] Título:Advanced optical simulation of scintillation detectors in GATE V8.0: first implementation of a reflectance model based on measured data.
[So] Source:Phys Med Biol;62(12):L1-L8, 2017 Jun 21.
[Is] ISSN:1361-6560
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Typical PET detectors are composed of a scintillator coupled to a photodetector that detects scintillation photons produced when high energy gamma photons interact with the crystal. A critical performance factor is the collection efficiency of these scintillation photons, which can be optimized through simulation. Accurate modelling of photon interactions with crystal surfaces is essential in optical simulations, but the existing UNIFIED model in GATE is often inaccurate, especially for rough surfaces. Previously a new approach for modelling surface reflections based on measured surfaces was validated using custom Monte Carlo code. In this work, the LUT Davis model is implemented and validated in GATE and GEANT4, and is made accessible for all users in the nuclear imaging research community. Look-up-tables (LUTs) from various crystal surfaces are calculated based on measured surfaces obtained by atomic force microscopy. The LUTs include photon reflection probabilities and directions depending on incidence angle. We provide LUTs for rough and polished surfaces with different reflectors and coupling media. Validation parameters include light output measured at different depths of interaction in the crystal and photon track lengths, as both parameters are strongly dependent on reflector characteristics and distinguish between models. Results from the GATE/GEANT4 beta version are compared to those from our custom code and experimental data, as well as the UNIFIED model. GATE simulations with the LUT Davis model show average variations in light output of <2% from the custom code and excellent agreement for track lengths with R > 0.99. Experimental data agree within 9% for relative light output. The new model also simplifies surface definition, as no complex input parameters are needed. The LUT Davis model makes optical simulations for nuclear imaging detectors much more precise, especially for studies with rough crystal surfaces. It will be available in GATE V8.0.
[Mh] Termos MeSH primário: Método de Monte Carlo
Fenômenos Ópticos
Fótons
Contagem de Cintilação
[Mh] Termos MeSH secundário: Tomografia por Emissão de Pósitrons
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1712
[Cu] Atualização por classe:171218
[Lr] Data última revisão:
171218
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170429
[St] Status:MEDLINE
[do] DOI:10.1088/1361-6560/aa7007


  5 / 4017 MEDLINE  
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[PMID]:29045414
[Au] Autor:Gharibshahi L; Saion E; Gharibshahi E; Shaari AH; Matori KA
[Ad] Endereço:Department of Physics, Faculty of Science, University of Putra Malaysia (UPM), Serdang, Selangor, Malaysia.
[Ti] Título:Influence of Poly(vinylpyrrolidone) concentration on properties of silver nanoparticles manufactured by modified thermal treatment method.
[So] Source:PLoS One;12(10):e0186094, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Very narrow and pure silver nanoparticles were synthesized by modified thermal treatment method via oxygen and nitrogen flow in succession. The structural and optical properties of the calcined silver nanoparticles at 600°C with diverse Poly(vinylpyrrolidone) concentrations varied from 2% to 4% were studied by means of different techniques. Fourier transform infrared spectroscopy was used to monitor the production of pure Ag nanoparticles at a given Poly(vinylpyrrolidone) concentration. The X-ray powder diffraction spectra are evidence for the transformation of the amorphous sample at 30°C to the cubic crystalline nanostructures at the calcination temperatures for all Poly(vinylpyrrolidone) concentrations. The transmission electron microscopy images showed the creation of spherical silver nanoparticles with the average particle size decreased by increasing Poly(vinylpyrrolidone) concentrations from 4.61 nm at 2% to 2.49 nm at 4% Poly(vinylpyrrolidone). The optical properties were investigated by means of UV-vis absorption spectrophotometer, which showed an increase in the conduction band of Ag nanoparticles with increasing Poly(vinylpyrrolidone) concentrations from 2.83 eV at 2% Poly(vinylpyrrolidone) to 2.94 eV at 4% Poly(vinylpyrrolidone) due to decreasing particle size. This was due to less attraction between conduction electrons and metal ions for smaller particle size corresponding to fewer atoms that made up the metal nanoparticles.
[Mh] Termos MeSH primário: Nanopartículas Metálicas/química
Nanotecnologia/métodos
Povidona/farmacologia
Prata/farmacologia
Temperatura Ambiente
[Mh] Termos MeSH secundário: Nanopartículas Metálicas/ultraestrutura
Fenômenos Ópticos
Tamanho da Partícula
Pós
Espectrofotometria Ultravioleta
Espectroscopia de Infravermelho com Transformada de Fourier
Difração de Raios X
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Powders); 3M4G523W1G (Silver); FZ989GH94E (Povidone)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171116
[Lr] Data última revisão:
171116
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171019
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0186094


  6 / 4017 MEDLINE  
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[PMID]:28961581
[Au] Autor:Bauer S; Janßen M; Schmitz M; Ott G
[Ad] Endereço:*Federal Institute for Occupational Safety and Health (BAuA), Unit Physical Agents, Friedrich-Henkel-Weg 1-25, 44149 Dortmund, Germany; †Institute for Occupational Safety and Health of the German Social Accident Insurance (IFA), Alte Heerstraße 111, 53757 Sankt Augustin, Germany.
[Ti] Título:Mathematical Modeling of Optical Radiation Emission as a Function of Welding Power during Gas Shielded Metal Arc Welding.
[So] Source:Health Phys;113(5):335-346, 2017 Nov.
[Is] ISSN:1538-5159
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Arc welding is accompanied by intense optical radiation emission that can be detrimental not only for the welder himself but also for people working nearby or for passersby. Technological progress advances continuously in the field of joining, so an up-to-date radiation database is necessary. Additionally, many literature irradiance data have been measured for a few welding currents or for parts of the optical spectral region only. Within this paper, a comprehensive study of contemporary metal active gas, metal inert gas, and cold metal transfer welding is presented covering optical radiation emission from 200 up to 2,700 nm by means of (spectro-) radiometric measurements. The investigated welding currents range from 70 to 350 A, reflecting values usually applied in industry. Based upon these new irradiance data, three mathematical models were derived in order to describe optical radiation emission as a function of welding power. The linear, exponential, and sigmoidal emission models depend on the process variant (standard or pulsed) as well as on the welding material (mild and stainless steel, aluminum). In conjunction with the corresponding exposure limit values for incoherent optical radiation maximum permissible exposure durations were calculated as a function of welding power. Typical times are shorter than 1 s for the ultraviolet spectral region and range from 1 to 10 s for visible radiation. For the infrared regime, exposure durations are of the order of minutes to hours. Finally, a validation of the metal active gas emission models was carried out with manual arc welding.
[Mh] Termos MeSH primário: Gases
Metais
Modelos Teóricos
Exposição Ocupacional/análise
Fenômenos Ópticos
Soldagem
[Mh] Termos MeSH secundário: Raios Infravermelhos
Raios Ultravioleta
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Gases); 0 (Metals)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171010
[Lr] Data última revisão:
171010
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170930
[St] Status:MEDLINE
[do] DOI:10.1097/HP.0000000000000709


  7 / 4017 MEDLINE  
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[PMID]:28949441
[Au] Autor:Bolink HJ; Mhaisalkar SG
[Ad] Endereço:Instituto de Ciencia Molecular, Universidad de Valencia, Catedrático José Beltrán, 2, 46980, Paterna, Spain.
[Ti] Título:Preface to Special Issue of ChemSusChem on Perovskite Optoelectronics.
[So] Source:ChemSusChem;10(19):3684-3686, 2017 Oct 09.
[Is] ISSN:1864-564X
[Cp] País de publicação:Germany
[La] Idioma:eng
[Ab] Resumo:This Editorial introduces one of two companion Special Issues on "Halide Perovskites for Optoelectronics Applications" in ChemSusChem and Energy Technology following the ICMAT 2017 Conference in Singapore. More information on the other Special Issue can be found in the Editorial published in Energy Technology.
[Mh] Termos MeSH primário: Compostos de Cálcio/química
Fontes de Energia Elétrica
Fenômenos Ópticos
Óxidos/química
Publicações Periódicas como Assunto
Energia Solar
Titânio/química
[Pt] Tipo de publicação:EDITORIAL
[Nm] Nome de substância:
0 (Calcium Compounds); 0 (Oxides); 12194-71-7 (perovskite); D1JT611TNE (Titanium)
[Em] Mês de entrada:1711
[Cu] Atualização por classe:171106
[Lr] Data última revisão:
171106
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170927
[St] Status:MEDLINE
[do] DOI:10.1002/cssc.201701756


  8 / 4017 MEDLINE  
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[PMID]:28801460
[Au] Autor:Muehl EM; Gajsiewicz JM; Medfisch SM; Wiersma ZSB; Morrissey JH; Bailey RC
[Ad] Endereço:From the Departments of Chemistry and.
[Ti] Título:Multiplexed silicon photonic sensor arrays enable facile characterization of coagulation protein binding to nanodiscs with variable lipid content.
[So] Source:J Biol Chem;292(39):16249-16256, 2017 Sep 29.
[Is] ISSN:1083-351X
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Interactions of soluble proteins with the cell membrane are critical within the blood coagulation cascade. Of particular interest are the interactions of γ-carboxyglutamic acid-rich domain-containing clotting proteins with lipids. Variability among conventional analytical methods presents challenges for comparing clotting protein-lipid interactions. Most previous studies have investigated only a single clotting protein and lipid composition and have yielded widely different binding constants. Herein, we demonstrate that a combination of lipid bilayer nanodiscs and a multiplexed silicon photonic analysis technology enables high-throughput probing of many protein-lipid interactions among blood-clotting proteins. This approach allowed direct comparison of the binding constants of prothrombin, factor X, activated factor VII, and activated protein C to seven different binary lipid compositions. In a single experiment, the binding constants of one protein interacting with all lipid compositions were simultaneously determined. A simple surface regeneration then facilitated similar binding measurements for three other coagulation proteins. As expected, our results indicated that all proteins exhibit tighter binding (lower ) as the proportion of anionic lipid increases. Interestingly, at high proportions of phosphatidylserine, the values of all four proteins began to converge. We also found that although values for all four proteins followed trends similar to those observed for the values, the variation among the proteins was much lower, indicating that much of the variation came from the kinetic binding ( ) of the proteins. These findings indicate that the combination of silicon photonic microring resonator arrays and nanodiscs enables rapid interrogation of biomolecular binding interactions at model cell membrane interfaces.
[Mh] Termos MeSH primário: Fator VIIa/metabolismo
Fator X/metabolismo
Ácidos Fosfatídicos/metabolismo
Fosfatidilcolinas/metabolismo
Fosfatidilserinas/metabolismo
Proteína C/metabolismo
Protrombina/metabolismo
[Mh] Termos MeSH secundário: Fator VIIa/química
Fator VIIa/genética
Fator X/química
Ensaios de Triagem em Larga Escala
Seres Humanos
Cinética
Bicamadas Lipídicas/química
Bicamadas Lipídicas/metabolismo
Nanoestruturas/química
Fenômenos Ópticos
Ácidos Fosfatídicos/química
Fosfatidilcolinas/química
Fosfatidilserinas/química
Análise Serial de Proteínas
Proteína C/química
Protrombina/química
Proteínas Recombinantes/química
Proteínas Recombinantes/metabolismo
Silício/química
[Pt] Tipo de publicação:COMPARATIVE STUDY; JOURNAL ARTICLE
[Nm] Nome de substância:
0 (1-palmitoyl-2-oleoyl-glycero-3-phosphatidic acid); 0 (Lipid Bilayers); 0 (Phosphatidic Acids); 0 (Phosphatidylcholines); 0 (Phosphatidylserines); 0 (Protein C); 0 (Recombinant Proteins); 40290-44-6 (1-palmitoyl-2-oleoylglycero-3-phosphoserine); 9001-26-7 (Prothrombin); 9001-29-0 (Factor X); EC 3.4.21.21 (Factor VIIa); TE895536Y5 (1-palmitoyl-2-oleoylphosphatidylcholine); Z4152N8IUI (Silicon)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171016
[Lr] Data última revisão:
171016
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170813
[St] Status:MEDLINE
[do] DOI:10.1074/jbc.M117.800938


  9 / 4017 MEDLINE  
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[PMID]:28727812
[Au] Autor:Postnikov AV; Uvarov IV; Lokhanin MV; Svetovoy VB
[Ad] Endereço:Yaroslavl Branch of the Institute of Physics and Technology, Russian Academy of Sciencies, Yaroslavl, Russia.
[Ti] Título:Electrically controlled cloud of bulk nanobubbles in water solutions.
[So] Source:PLoS One;12(7):e0181727, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Using different experimental techniques we visualize a cloud of gas in water that is produced electrochemically by the alternating polarity process. Liquid enriched with gas does not contain bubbles strongly scattering visible light but its refractive index changes significantly near the electrodes. The change of the refractive index is a collective effect of bulk nanobubbles with a diameter smaller than 200 nm. Any alternative explanation fails to explain the magnitude of the effect. Spatial structure of the cloud is investigated with the optical lever method. Its dynamics is visualised observing optical distortion of the electrode images or using differential interference contrast method. The cloud covers concentric electrodes, in a steady state it is roughly hemispherical with a size two times larger than the size of the electrode structure. When the electrical pulses are switched off the cloud disappears in less than one second. The total concentration of gases can reach very high value estimated as 3.5 × 1020 cm-3 that corresponds to an effective supersaturation of 500 and 150 for hydrogen and oxygen, respectively.
[Mh] Termos MeSH primário: Eletricidade
Gases
Microbolhas
Água
[Mh] Termos MeSH secundário: Eletrodos
Gases/química
Hidrogênio/química
Fenômenos Ópticos
Oxigênio/química
Refratometria
Vibração
Água/química
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Gases); 059QF0KO0R (Water); 7YNJ3PO35Z (Hydrogen); S88TT14065 (Oxygen)
[Em] Mês de entrada:1709
[Cu] Atualização por classe:170926
[Lr] Data última revisão:
170926
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170721
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0181727


  10 / 4017 MEDLINE  
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[PMID]:28719095
[Au] Autor:Li Y; Fu Q; Rojas R; Yan M; Lawoko M; Berglund L
[Ad] Endereço:Department of Fibre and Polymer Technology, Wallenberg Wood Science Center, Chemical Science and Engineering Institution, KTH Royal Institute of Technology, Teknikringen 56-58, Stockholm, Sweden.
[Ti] Título:Lignin-Retaining Transparent Wood.
[So] Source:ChemSusChem;10(17):3445-3451, 2017 Sep 11.
[Is] ISSN:1864-564X
[Cp] País de publicação:Germany
[La] Idioma:eng
[Ab] Resumo:Optically transparent wood, combining optical and mechanical performance, is an emerging new material for light-transmitting structures in buildings with the aim of reducing energy consumption. One of the main obstacles for transparent wood fabrication is delignification, where around 30 wt % of wood tissue is removed to reduce light absorption and refractive index mismatch. This step is time consuming and not environmentally benign. Moreover, lignin removal weakens the wood structure, limiting the fabrication of large structures. A green and industrially feasible method has now been developed to prepare transparent wood. Up to 80 wt % of lignin is preserved, leading to a stronger wood template compared to the delignified alternative. After polymer infiltration, a high-lignin-content transparent wood with transmittance of 83 %, haze of 75 %, thermal conductivity of 0.23 W mK , and work-tofracture of 1.2 MJ m (a magnitude higher than glass) was obtained. This transparent wood preparation method is efficient and applicable to various wood species. The transparent wood obtained shows potential for application in energy-saving buildings.
[Mh] Termos MeSH primário: Lignanas/química
Fenômenos Ópticos
Madeira/química
[Mh] Termos MeSH secundário: Química Verde
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Lignans)
[Em] Mês de entrada:1709
[Cu] Atualização por classe:171004
[Lr] Data última revisão:
171004
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170719
[St] Status:MEDLINE
[do] DOI:10.1002/cssc.201701089



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