Base de dados : MEDLINE
Pesquisa : G01.590.310 [Categoria DeCS]
Referências encontradas : 9 [refinar]
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  1 / 9 MEDLINE  
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[PMID]:27873005
[Au] Autor:Stavenga DG; Meglic A; Pirih P; Koshitaka H; Arikawa K; Wehling MF; Belusic G
[Ad] Endereço:Computational Physics, Zernike Institute for Advanced Materials, University of Groningen, NL9747AG, Groningen, The Netherlands. D.G.Stavenga@rug.nl.
[Ti] Título:Photoreceptor spectral tuning by colorful, multilayered facet lenses in long-legged fly eyes (Dolichopodidae).
[So] Source:J Comp Physiol A Neuroethol Sens Neural Behav Physiol;203(1):23-33, 2017 Jan.
[Is] ISSN:1432-1351
[Cp] País de publicação:Germany
[La] Idioma:eng
[Ab] Resumo:The facet lenses of the compound eyes of long-legged flies (Dolichopodidae) feature a striking, interlaced coloration pattern, existing of alternating rows of green-yellow and orange-red reflecting facets, due to dielectric multilayers located distally in the facet lenses (Bernard and Miller. Invest Ophthalmol 7:416-434 (1968). We investigated this phenomenon in the dolichopodid Dolichopus nitidus by applying microspectrophotometry, electron microscopy and optical modeling. The measured narrow-band reflectance spectra, peaking at ~540 and ~590 nm with bandwidth ~105 nm, are well explained by a refractive index oscillating sinusoidally in six periods around a mean value of about 1.44 with amplitude 0.6. The facet lens reflectance spectra are associated with a spectrally restricted, reduced transmittance, which causes modified spectral sensitivities of the underlying photoreceptors. Based on the modeling and electroretinography of the dolichopodid Condylostylus japonicus we conjecture that the green and orange facets narrow the spectral bandwidths of blue and green central photoreceptors, respectively, thus possibly improving color and/or polarization vision.
[Mh] Termos MeSH primário: Olho Composto de Artrópodes/metabolismo
Olho Composto de Artrópodes/ultraestrutura
Dípteros/anatomia & histologia
Dípteros/metabolismo
Células Fotorreceptoras de Invertebrados/metabolismo
[Mh] Termos MeSH secundário: Animais
Eletrorretinografia
Feminino
Proteínas de Insetos/metabolismo
Iridescência
Masculino
Microscopia Eletrônica de Transmissão
Microespectrofotometria
Modelos Biológicos
Pigmentos da Retina/metabolismo
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Insect Proteins); 0 (Retinal Pigments)
[Em] Mês de entrada:1709
[Cu] Atualização por classe:170925
[Lr] Data última revisão:
170925
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161123
[St] Status:MEDLINE
[do] DOI:10.1007/s00359-016-1131-y


  2 / 9 MEDLINE  
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[PMID]:27546859
[Au] Autor:Lee YK
[Ad] Endereço:Institute for Clinical Performance of Biomaterials (ICPB) and ETN Dental Clinic.
[Ti] Título:Opalescence of human teeth and dental esthetic restorative materials.
[So] Source:Dent Mater J;35(6):845-854, 2016 Dec 01.
[Is] ISSN:1881-1361
[Cp] País de publicação:Japan
[La] Idioma:eng
[Ab] Resumo:Human tooth enamel is opalescent, which renders teeth bluish in reflected and orange in transmitted color. The aim was to review opalescent property of teeth and application and mimetic reproduction in esthetic restorations. A PubMed search for articles published in English till 2015 on the opalescence of teeth and esthetic materials revealed 29 relevant papers. Opalescence was measured with OP-RT index, which was calculated as the difference in the yellow-blue and red-green color coordinates between the reflected and transmitted colors. Mean OP-RT value of human enamel was 22.9. OP-RT values of direct resin composites changed after polymerization, and the range in these materials was 5.7-23.7. OP-RT value ranges were 1.6-6.1 and 2.0-7.1 for the core and veneer ceramics, respectively. Since the OP-RT values of esthetic materials were lower than that of enamel, it is recommended that materials that can reproduce the opalescence of enamel be further designed.
[Mh] Termos MeSH primário: Resinas Compostas
Materiais Dentários
Estética Dentária
[Mh] Termos MeSH secundário: Cor
Restauração Dentária Permanente
Seres Humanos
Iridescência
Dente
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Composite Resins); 0 (Dental Materials)
[Em] Mês de entrada:1708
[Cu] Atualização por classe:170823
[Lr] Data última revisão:
170823
[Sb] Subgrupo de revista:D
[Da] Data de entrada para processamento:160823
[St] Status:MEDLINE


  3 / 9 MEDLINE  
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[PMID]:27072662
[Au] Autor:Giraldo MA; Stavenga DG
[Ad] Endereço:Biophysics Group, Institute of Physics, University of Antioquia, Calle 70 #52-21, AA 1226, Medellín, Colombia.
[Ti] Título:Brilliant iridescence of Morpho butterfly wing scales is due to both a thin film lower lamina and a multilayered upper lamina.
[So] Source:J Comp Physiol A Neuroethol Sens Neural Behav Physiol;202(5):381-8, 2016 May.
[Is] ISSN:1432-1351
[Cp] País de publicação:Germany
[La] Idioma:eng
[Ab] Resumo:Butterflies belonging to the nymphalid subfamily, Morphinae, are famous for their brilliant blue wing coloration and iridescence. These striking optical phenomena are commonly explained as to originate from multilayer reflections by the ridges of the wing scales. Because the lower lamina of the scales of related nymphalid butterflies, the Nymphalinae, plays a dominant role in the wing coloration, by acting as a thin film reflector, we investigated single blue scales of three characteristic Morpho species: M. epistrophus, M. helenor and M. cypris. The experimental data obtained by spectrophotometry, scatterometry and scanning electron microscopy demonstrated that also in the Morpho genus the lower lamina of both the cover and ground scales acts as an optical thin film reflector, contributing importantly to the blue structural coloration of the wings. Melanin pigment has a contrast-enhancing function in a sub-class of ground scales.
[Mh] Termos MeSH primário: Borboletas/metabolismo
Borboletas/ultraestrutura
Iridescência
Asas de Animais/metabolismo
Asas de Animais/ultraestrutura
[Mh] Termos MeSH secundário: Animais
Microscopia Eletrônica de Varredura
Pigmentação
Especificidade da Espécie
Espectrofotometria
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1709
[Cu] Atualização por classe:170922
[Lr] Data última revisão:
170922
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160414
[St] Status:MEDLINE
[do] DOI:10.1007/s00359-016-1084-1


  4 / 9 MEDLINE  
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[PMID]:27017836
[Au] Autor:Raut AS; Kalonia DS
[Ad] Endereço:Department of Pharmaceutical Sciences, University of Connecticut , Storrs, Connecticut 06269, United States.
[Ti] Título:Pharmaceutical Perspective on Opalescence and Liquid-Liquid Phase Separation in Protein Solutions.
[So] Source:Mol Pharm;13(5):1431-44, 2016 May 02.
[Is] ISSN:1543-8392
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Opalescence in protein solutions reduces aesthetic appeal of a formulation and can be an indicator of the presence of aggregates or precursor to phase separation in solution signifying reduced product stability. Liquid-liquid phase separation of a protein solution into a protein-rich and a protein-poor phase has been well-documented for globular proteins and recently observed for monoclonal antibody solutions, resulting in physical instability of the formulation. The present review discusses opalescence and liquid-liquid phase separation (LLPS) for therapeutic protein formulations. A brief discussion on theoretical concepts based on thermodynamics, kinetics, and light scattering is presented. This review also discusses theoretical concepts behind intense light scattering in the vicinity of the critical point termed as "critical opalescence". Both opalescence and LLPS are affected by the formulation factors including pH, ionic strength, protein concentration, temperature, and excipients. Literature reports for the effect of these formulation factors on attractive protein-protein interactions in solution as assessed by the second virial coefficient (B2) and the cloud-point temperature (Tcloud) measurements are also presented. The review also highlights pharmaceutical implications of LLPS in protein solutions.
[Mh] Termos MeSH primário: Iridescência/efeitos dos fármacos
Soluções Farmacêuticas/química
Soluções Farmacêuticas/farmacologia
Proteínas/química
Soluções/química
Soluções/farmacologia
[Mh] Termos MeSH secundário: Anticorpos Monoclonais/química
Química Farmacêutica/métodos
Seres Humanos
Concentração de Íons de Hidrogênio
Concentração Osmolar
Temperatura Ambiente
Termodinâmica
[Pt] Tipo de publicação:JOURNAL ARTICLE; REVIEW
[Nm] Nome de substância:
0 (Antibodies, Monoclonal); 0 (Pharmaceutical Solutions); 0 (Proteins); 0 (Solutions)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171019
[Lr] Data última revisão:
171019
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160329
[St] Status:MEDLINE
[do] DOI:10.1021/acs.molpharmaceut.5b00937


  5 / 9 MEDLINE  
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[PMID]:26925845
[Au] Autor:Shiraishi T; Watanabe I
[Ad] Endereço:Department of Dental and Biomedical Materials Science, Graduate School of Biomedical Sciences, Nagasaki University, 1-7-1 Sakamoto, Nagasaki 852-8588, Japan. Electronic address: siraisi@nagasaki-u.ac.jp.
[Ti] Título:Thickness dependence of light transmittance, translucency and opalescence of a ceria-stabilized zirconia/alumina nanocomposite for dental applications.
[So] Source:Dent Mater;32(5):660-7, 2016 May.
[Is] ISSN:1879-0097
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:OBJECTIVES: This study was conducted to investigate thickness dependence of light transmittance, translucency and opalescence of a commercially available fully-sintered ceria-stabilized zirconia/alumina nanocomposite for dental all-ceramic restorations. METHODS: Three disk samples of 16 mm in diameter and thickness ranging from 0.2 to 0.6 mm with 0.1 mm increment each were cut from a fully-sintered rod-shaped Ce-TZP/alumina nanocomposite (NANOZR, Panasonic Healthcare, Japan) and polished flat by using diamond slurry. Spectral light transmittance data under the CIE standard illuminant D65 were recorded at 10nm intervals from 360 to 740 nm using a computer-controlled spectrophotometer. Average transmittance, translucency and opalescence parameters were determined as a function of sample thickness. Optical properties of a fully-sintered yttria-stabilized tetragonal zirconia polycrystals (Cercon(®) base, DeguDent GmbH, Germany) were also investigated as a reference. Two-way ANOVA was performed to determine the significant differences in various optical parameters among types of ceramic and thicknesses at α=0.05. RESULTS: Results of the two-way ANOVA showed that the average transmittance, translucency and opalescence parameters of both ceramic materials were significantly influenced by the type of ceramic and thickness (p<0.001). Light transmittance of the NANOZR was significantly lower than that of the Cercon(®) base. For both ceramic materials, average transmittance of light and translucency parameter decreased with sample thickness following exponential functions. The NANOZR showed substantially higher opalescence parameters exceeding 20 CIE units when the sample thickness was nearly 0.3 mm. The prominent characteristics of high opalescence and low transmittance of light in the NANOZR was considered to be caused by its specific very fine interpenetrated intragranular microstructure and by a large difference of refractive indices of Ce-TZP and alumina components. SIGNIFICANCE: High opalescence and low transmittance of light of the ceria-stabilized zirconia/alumina nanocomposite (NANOZR) are attractive properties for use as a substructure in fabricating porcelain-veneering-type esthetic all-ceramic restorations.
[Mh] Termos MeSH primário: Óxido de Alumínio
Porcelana Dentária
Nanocompostos
Zircônio
[Mh] Termos MeSH secundário: Cerâmica
Iridescência
Teste de Materiais
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
12001-21-7 (Dental Porcelain); C6V6S92N3C (Zirconium); LMI26O6933 (Aluminum Oxide)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171011
[Lr] Data última revisão:
171011
[Sb] Subgrupo de revista:D
[Da] Data de entrada para processamento:160302
[St] Status:MEDLINE


  6 / 9 MEDLINE  
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[PMID]:26923789
[Au] Autor:Whitney HM; Reed A; Rands SA; Chittka L; Glover BJ
[Ad] Endereço:School of Biological Sciences, University of Bristol, Life Sciences Building, Tyndall Avenue, Bristol BS8 1TQ, UK. Electronic address: heather.whitney@bristol.ac.uk.
[Ti] Título:Flower Iridescence Increases Object Detection in the Insect Visual System without Compromising Object Identity.
[So] Source:Curr Biol;26(6):802-8, 2016 Mar 21.
[Is] ISSN:1879-0445
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Iridescence is a form of structural coloration, produced by a range of structures, in which hue is dependent on viewing angle [1-4]. One of these structures, the diffraction grating, is found both in animals (for example, beetles [2]) and in plants (on the petals of some animal pollinated flowers [5]). The behavioral impacts of floral iridescence and its potential ecological significance are unknown [6-9]. Animal-pollinated flowers are described as "sensory billboards" [10], with many floral features contributing to a conspicuous display that filters prospective pollinators. Yet floral iridescence is more subtle to the human eye than that of many animal displays because the floral diffraction grating is not perfectly regular [5-9]. This presents a puzzle: if the function of petals is to attract pollinators, then flowers might be expected to optimize iridescence to increase showiness. On the other hand, pollinators memorize floral colors as consistent advertisements of reward quality, and iridescence might corrupt flower color identity. Here we tested the trade-off between flower detectability and recognition, requiring bumblebees (Bombus terrestris) to identify artificial flowers that varied in pigmentation and degree of iridescence. We find that iridescence does increase target detectability but that "perfect" iridescence (produced by an artificial diffraction grating) corrupts target identity and bees make many mistakes. However, "imperfect" floral iridescence does not lead to mistaken target identity, while still benefitting flower detectability. We hypothesize that similar trade-offs might be found in the many naturally "imperfect" iridescence-producing structures found in animal-animal, as well as other plant-animal, interactions.
[Mh] Termos MeSH primário: Abelhas/fisiologia
Percepção de Cores/fisiologia
Flores/fisiologia
Iridescência
Reconhecimento Visual de Modelos/fisiologia
[Mh] Termos MeSH secundário: Animais
Fatores de Tempo
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Em] Mês de entrada:1612
[Cu] Atualização por classe:170922
[Lr] Data última revisão:
170922
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160301
[St] Status:MEDLINE


  7 / 9 MEDLINE  
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[PMID]:26819100
[Au] Autor:Kientz B; Luke S; Vukusic P; Péteri R; Beaudry C; Renault T; Simon D; Mignot T; Rosenfeld E
[Ad] Endereço:UMR 7266 CNRS- Littoral Environnement et Sociétés, Microbial Physiology Group - Université de La Rochelle, Avenue Michel Crépeau, 17042 La Rochelle, France.
[Ti] Título:A unique self-organization of bacterial sub-communities creates iridescence in Cellulophaga lytica colony biofilms.
[So] Source:Sci Rep;6:19906, 2016 Jan 28.
[Is] ISSN:2045-2322
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Iridescent color appearances are widespread in nature. They arise from the interaction of light with micron- and submicron-sized physical structures spatially arranged with periodic geometry and are usually associated with bright angle-dependent hues. Iridescence has been reported for many animals and marine organisms. However, iridescence has not been well studied in bacteria. Recently, we reported a brilliant "pointillistic" iridescence in colony biofilms of marine Flavobacteria that exhibit gliding motility. The mechanism of their iridescence is unknown. Here, using a multi-disciplinary approach, we show that the cause of iridescence is a unique periodicity of the cell population in the colony biofilm. Cells are arranged together to form hexagonal photonic crystals. Our model highlights a novel pattern of self-organization in a bacterial biofilm. "Pointillistic" bacterial iridescence can be considered a new light-dependent phenomenon for the field of microbiology.
[Mh] Termos MeSH primário: Biofilmes
Flavobacteriaceae/fisiologia
Iridescência
[Mh] Termos MeSH secundário: Cor
Flavobacteriaceae/ultraestrutura
Luz
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Em] Mês de entrada:1701
[Cu] Atualização por classe:170220
[Lr] Data última revisão:
170220
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160129
[St] Status:MEDLINE
[do] DOI:10.1038/srep19906


  8 / 9 MEDLINE  
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[PMID]:26530066
[Au] Autor:Chernova OF; Fadeeva EO; Ilyashenko VY
[Ad] Endereço:Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences, Leninskii pr. 33, Moscow, 117071, Russia. chernova@sevin.ru.
[Ti] Título:Scanning electron microscopy of the iridescent feather architectonics of the white throated needletail (Hirundapus caudacutus, Apodidae, Aves).
[So] Source:Dokl Biol Sci;464:239-43, 2015.
[Is] ISSN:1608-3105
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:By means of SEM, it has been demonstrated that structural coloration of the needletail Hirundapus caudacutus depends on architectonics of iridescent feathers of the bird.
[Mh] Termos MeSH primário: Plumas/ultraestrutura
[Mh] Termos MeSH secundário: Animais
Aves
Plumas/química
Iridescência
Pigmentação
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1608
[Cu] Atualização por classe:171019
[Lr] Data última revisão:
171019
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:151105
[St] Status:MEDLINE
[do] DOI:10.1134/S001249661505004X


  9 / 9 MEDLINE  
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[PMID]:25556561
[Au] Autor:Raut AS; Kalonia DS
[Ad] Endereço:Department of Pharmaceutical Sciences, University of Connecticut, Storrs, Connecticut, 06269.
[Ti] Título:Opalescence in monoclonal antibody solutions and its correlation with intermolecular interactions in dilute and concentrated solutions.
[So] Source:J Pharm Sci;104(4):1263-74, 2015 Apr.
[Is] ISSN:1520-6017
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Opalescence indicates physical instability of a formulation because of the presence of aggregates or liquid-liquid phase separation in solution and has been reported for monoclonal antibody (mAb) formulations. Increased solution opalescence can be attributed to attractive protein-protein interactions (PPIs). Techniques including light scattering, AUC, or membrane osmometry are routinely employed to measure PPIs in dilute solutions, whereas opalescence is seen at relatively higher concentrations, where both long- and short-range forces contribute to overall PPIs. The mAb molecule studied here shows a unique property of high opalescence because of liquid-liquid phase separation. In this study, opalescence measurements are correlated to PPIs measured in diluted and concentrated solutions using light scattering (kD ) and high-frequency rheology (G'), respectively. Charges on the molecules were calculated using zeta potential measurements. Results indicate that high opalescence and phase separation are a result of the attractive interactions in solution; however, the presence of attractive interactions do not always imply phase separation. Temperature dependence of opalescence suggests that thermodynamic contribution to opalescence is significant and Tcloud can be utilized as a potential tool to assess attractive interactions in solution.
[Mh] Termos MeSH primário: Anticorpos Monoclonais/química
[Mh] Termos MeSH secundário: Química Farmacêutica
Estabilidade de Medicamentos
Iridescência
Luz
Modelos Químicos
Concentração Osmolar
Soluções Farmacêuticas
Desnaturação Proteica
Estabilidade Proteica
Reologia
Espalhamento de Radiação
Solubilidade
Tecnologia Farmacêutica/métodos
Temperatura Ambiente
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Antibodies, Monoclonal); 0 (Pharmaceutical Solutions)
[Em] Mês de entrada:1512
[Cu] Atualização por classe:150313
[Lr] Data última revisão:
150313
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:150106
[St] Status:MEDLINE
[do] DOI:10.1002/jps.24326



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