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https://www.readbyqxmd.com/read/28715169/fabrication-of-biocompatible-functional-and-transparent-hybrid-films-based-on-silk-fibroin-and-epoxy-silane-for-biophotonics
#1
Robson Rosa da Silva, Mauricio Cavicchioli, Lais Rocalho de Lima, Caio Gomide Otoni, Hernane da Silva Barud, Silvia Helena Santagneli, Agnieszka Tercjak, André Capaldo Amaral, Renata Aquino Carvalho, Sidney José Lima Ribeiro
In this work we explored the fabrication of flexible and transparent hybrids of silk fibroin and epoxy modified siloxane for photonic applications. It is well known that regenerated silk fibroin (SF) solutions can form free-standing films with high transparency. Although SF has a restricted number of chemically reactive side groups, the main issues of as-casted pristine SF films regard the high solubility into aqueous media, brittleness, and low thermal stability. The design of SF films with enhanced functionality but yet highly transparent triggers new opportunities on broader range of applications in biophotonics...
July 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28708389/nanostructured-phthalocyanine-assemblies-with-protein-driven-switchable-photoactivities-for-biophotonic-imaging-and-therapy
#2
Xingshu Li, C-Yoon Kim, Seunghyun Lee, Dayoung Lee, Hyung-Min Chung, Gyoungmi Kim, Si-Hyun Heo, Chulhong Kim, Ki-Sung Hong, Juyoung Yoon
Switchable phototheranostic nanomaterials are of particular interest for specific biosensing, high-quality imaging, and targeted therapy in the field of precision nanomedicine. Here, we develop a "one-for-all" nanomaterial that self-assembles from flexible and versatile phthalocyanine building blocks. The nanostructured phthalocyanine assemblies (NanoPcTBs) display intrinsically unique photothermal and photoacoustic properties. Fluorescence and reactive oxygen species generation can be triggered depending on a targeted, protein-induced, partial disassembly mechanism, which creates opportunities for low-background fluorescence imaging and activatable photodynamic therapy...
August 9, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28708170/widely-wavelength-tunable-fast-intensity-modulated-light-source-for-biophotonic-applications
#3
Tzu-Feng Huang, Sheng-Hao Tseng, Hsien-Yi Wang, Ming-Che Chan
High modulation depth, fast (megahertz to gigahertz), intensity-modulated light sources of various wavelengths within the 0.7-1.35 μm bio-penetration window are highly desirable for many biophotonic diagnosis systems. In this Letter, we present a novel scheme of a wavelength tunable, ultra-broadband light source which simply consists of a pump laser, a nonlinear fiber, and demodulation circuits. The working wavelength range of the light source is from 0.7 to 1.35 μm which covers a vast part of the bio-penetration window, and its modulation frequencies extends from tens of megahertz to gigahertz...
July 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/28700348/mechanisms-of-phosphenes-in-irradiated-patients
#4
REVIEW
Thibaud Mathis, Stephane Vignot, Cecila Leal, Jean-Pierre Caujolle, Celia Maschi, Martine Mauget-Faÿsse, Laurent Kodjikian, Stéphanie Baillif, Joel Herault, Juliette Thariat
Anomalous visual perceptions have been reported in various diseases of the retina and visual pathways or can be experienced under specific conditions in healthy individuals. Phosphenes are perceptions of light in the absence of ambient light, occurring independently of the physiological and classical photonic stimulation of the retina. They are a frequent symptom in patients irradiated in the region of the central nervous system (CNS), head and neck and the eyes. Phosphenes have historically been attributed to complex physical phenomena such as Cherenkov radiation...
June 28, 2017: Oncotarget
https://www.readbyqxmd.com/read/28686275/power-dependent-upconversion-quantum-yield-of-nayf4-yb-3-er-3-nano-and-micrometer-sized-particles-measurements-and-simulations
#5
Martin Kaiser, Christian Würth, Marco Kraft, Iko Hyppänen, Tero Soukka, Ute Resch-Genger
Photophysical studies of nonlinear lanthanide-doped photon upconverting nanoparticles (UCNPs) increasingly used in biophotonics and photovoltaics require absolute measurements of the excitation power density (P)-dependent upconversion luminescence (UCL) and luminescence quantum yields (ΦUC) for quantifying the material performance, UCL deactivation pathways, and possible enhancement factors. We present here the P-dependence of the UCL spectra, ΦUC, and slope factors of the different emission bands of representative 25 nm-sized oleate-capped β-NaYF4:17% Yb(3+), 3% Er(3+) UCNPs dispersed in toluene and as powder as well as ΦUC of 3 μm-sized upconversion particles (UCμP), all measured with a newly designed integrating sphere setup, enabling controlled variation of P over four orders of magnitude...
July 20, 2017: Nanoscale
https://www.readbyqxmd.com/read/28676880/innovations-and-developments-in-dermatologic-non-invasive-optical-imaging-and-potential-clinical-applications
#6
Eric Tkaczyk
Most dermatologists are aware of the benefits of dermoscopy, and a few are familiar with laser-scanning confocal microscopy. Beyond confocal, there are fully 11 different categories of optical techniques that have been applied to clinical dermatology. This article first provides a comprehensive tabular overview of all these optical diagnostic technologies and then details 4 of the lesser known innovations that are already available or still in development (laser Doppler and speckle imaging, Raman spectroscopy, multiphoton microscopy, photoacoustic tomography), with some potential applications in clinical dermatology (blood flow monitoring, skin cancer diagnosis, composition measurements in atopic dermatitis, skin rejuvenation measurement, and noninvasive sentinel lymph node assessment in melanoma)...
July 5, 2017: Acta Dermato-venereologica
https://www.readbyqxmd.com/read/28670607/sub-nyquist-sampling-boosts-targeted-light-transport-through-opaque-scattering-media
#7
Yuecheng Shen, Yan Liu, Cheng Ma, Lihong V Wang
Optical time-reversal techniques are being actively developed to focus light through or inside opaque scattering media. When applied to biological tissue, these techniques promise to revolutionize biophotonics by enabling deep-tissue non-invasive optical imaging, optogenetics, optical tweezing, and phototherapy. In all previous optical time-reversal experiments, the scattered light field was well-sampled during wavefront measurement and wavefront reconstruction, following the Nyquist sampling criterion. Here, we overturn this conventional practice by demonstrating that even when the scattered field is under-sampled, light can still be focused through or inside scattering media...
January 20, 2017: Optica
https://www.readbyqxmd.com/read/28630678/on-the-colour-of-wing-scales-in-butterflies-iridescence-and-preferred-orientation-of-single-gyroid-photonic-crystals
#8
Robert W Corkery, Eric C Tyrode
Lycaenid butterflies from the genera Callophrys, Cyanophrys and Thecla have evolved remarkable biophotonic gyroid nanostructures within their wing scales that have only recently been replicated by nanoscale additive manufacturing. These nanostructures selectively reflect parts of the visible spectrum to give their characteristic non-iridescent, matte-green appearance, despite a distinct blue-green-yellow iridescence predicted for individual crystals from theory. It has been hypothesized that the organism must achieve its uniform appearance by growing crystals with some restrictions on the possible distribution of orientations, yet preferential orientation observed in Callophrys rubi confirms that this distribution need not be uniform...
August 6, 2017: Interface Focus
https://www.readbyqxmd.com/read/28621356/dye-sensitized-lanthanide-doped-upconversion-nanoparticles
#9
Xindong Wang, Rashid R Valiev, Tymish Y Ohulchanskyy, Hans Ågren, Chunhui Yang, Guanying Chen
Lanthanide-doped upconversion nanoparticles (UCNPs) are promising for applications as wide as biological imaging, multimodal imaging, photodynamic therapy, volumetric displays, and solar cells. Yet, the weak and narrow absorption of lanthanide ions poses a fundamental limit of UCNPs to withhold their brightness, creating a long-standing hurdle for the field. Dye-sensitized UCNPs are emerging to address this performance-limiting problem, yielding up to thousands-fold brighter luminescence than conventional UCNPs without dye sensitization...
July 17, 2017: Chemical Society Reviews
https://www.readbyqxmd.com/read/28617393/-v-a-monich-biophotonics-sources-of-light-mechanisms-experimental-and-clinical-medicine-nizhnii-novgorod-state-medical-academy-2016
#10
V D Troshin
No abstract text is available yet for this article.
2017: Zhurnal Nevrologii i Psikhiatrii Imeni S.S. Korsakova
https://www.readbyqxmd.com/read/28576153/aqueous-nanoscale-systems
#11
Sylvie Roke
In the past five years the Laboratory for fundamental BioPhotonics (LBP) has worked on developing new technology that can access the molecular structure and nanoscale properties of buried aqueous interfaces and aqueous solutions. Using these methods a better understanding of the important role that water plays in (nanoscale and interfacial) processes can be obtained. These processes include the long-range interaction of ions with water, structural and charge anomalies of the hydrophobic/aqueous interface, the formation and stabilization of amphiphilic aqueous droplet interfaces, the formation and molecular properties of the electric double layer, as well as membrane structure and hydration...
May 31, 2017: Chimia
https://www.readbyqxmd.com/read/28546674/biophotons-as-subtle-energy-carriers
#12
EDITORIAL
T M Srinivasan
No abstract text is available yet for this article.
May 2017: International Journal of Yoga
https://www.readbyqxmd.com/read/28534815/multispectral-fluorescent-and-photoplethysmographic-imaging-for-remote-skin-assessment
#13
REVIEW
Janis Spigulis
Optical tissue imaging has several advantages over the routine clinical imaging methods, including non-invasiveness (it does not change the structure of tissues), remote operation (it avoids infections) and the ability to quantify the tissue condition by means of specific image parameters. Dermatologists and other skin experts need compact (preferably pocket-size), self-sustaining and easy-to-use imaging devices. The operational principles and designs of ten portable in-vivo skin imaging prototypes developed at the Biophotonics Laboratory of Institute of Atomic Physics and Spectroscopy, University of Latvia during the recent five years are presented in this paper...
May 19, 2017: Sensors
https://www.readbyqxmd.com/read/28530726/surface-enhanced-hyper-raman-scattering-sehrs-and-its-applications
#14
REVIEW
Fani Madzharova, Zsuzsanna Heiner, Janina Kneipp
Surface enhanced hyper Raman scattering (SEHRS) is the spontaneous, two-photon excited Raman scattering that occurs for molecules residing in high local optical fields of plasmonic nanostructures. Being regarded as a non-linear analogue of surface enhanced Raman scattering (SERS), SEHRS shares most of its properties, but also has additional characteristics. They include complementary spectroscopic information resulting from different selection rules and a stronger enhancement due to the non-linearity in excitation...
May 22, 2017: Chemical Society Reviews
https://www.readbyqxmd.com/read/28530232/tomographic-active-optical-trapping-of-arbitrarily-shaped-objects-by-exploiting-3d-refractive-index-maps
#15
Kyoohyun Kim, YongKeun Park
Optical trapping can manipulate the three-dimensional (3D) motion of spherical particles based on the simple prediction of optical forces and the responding motion of samples. However, controlling the 3D behaviour of non-spherical particles with arbitrary orientations is extremely challenging, due to experimental difficulties and extensive computations. Here, we achieve the real-time optical control of arbitrarily shaped particles by combining the wavefront shaping of a trapping beam and measurements of the 3D refractive index distribution of samples...
May 22, 2017: Nature Communications
https://www.readbyqxmd.com/read/28508050/butterfly-gyroid-nanostructures-as-a-time-frozen-glimpse-of-intracellular-membrane-development
#16
Bodo D Wilts, Benjamin Apeleo Zubiri, Michael A Klatt, Benjamin Butz, Michael G Fischer, Stephen T Kelly, Erdmann Spiecker, Ullrich Steiner, Gerd E Schröder-Turk
The formation of the biophotonic gyroid material in butterfly wing scales is an exceptional feat of evolutionary engineering of functional nanostructures. It is hypothesized that this nanostructure forms by chitin polymerization inside a convoluted membrane of corresponding shape in the endoplasmic reticulum. However, this dynamic formation process, including whether membrane folding and chitin expression are simultaneous or sequential processes, cannot yet be elucidated by in vivo imaging. We report an unusual hierarchical ultrastructure in the butterfly Thecla opisena that, as a solid material, allows high-resolution three-dimensional microscopy...
April 2017: Science Advances
https://www.readbyqxmd.com/read/28498629/biophotonics-world-more-than-just-a-news-page-the-largest-biophotonics-network-worldwide
#17
EDITORIAL
Jürgen Popp
No abstract text is available yet for this article.
May 2017: Journal of Biophotonics
https://www.readbyqxmd.com/read/28498628/erratum-high-speed-scmos-based-oblique-plane-microscopy-applied-to-the-study-of-calcium-dynamics-in-cardiac-myocytes-j-biophotonics-9-no-3-311-323-2016
#18
Markus B Sikkel, Sunil Kumar, Vincent Maioli, Christina Rowlands, Fabiana Gordon, Sian E Harding, Alexander R Lyon, Kenneth T MacLeod, Chris Dunsby
In the article by M.B. Sikkel et al. (doi: 10.1002/jbio.201500193), published in J. Biophotonics 9, 311-323 (2016), an error occurred in the computer code that was used to generate Figure 3. This erratum is published to correct Figure 3, the calculated value of tgeom and the experimentally determined value of toptics in the text of the article.
May 2017: Journal of Biophotonics
https://www.readbyqxmd.com/read/28371466/evaluation-of-the-2-1-hexyloxyethyl-2-devinyl-pyropheophorbide-hpph-mediated-photodynamic-therapy-by-macroscopic-singlet-oxygen-modeling-j-biophotonics-9-no-11-12-1344-1354-2016
#19
Rozhin Penjweini, Michele M Kim, Baochang Liu, Timothy C Zhu
In the article by R. Penjweini, M. M. Kim et al. (doi: 10.1002/jbio.201600121), published in J. Biophotonics 9, 1344-1354 (2016), the constants C01 , C02 , b1 , and b2 determined from fitting the fluorescence single value decomposition (SVD) for phantoms with different optical properties and the corresponding Figure 2(a) are not correct. This erratum is published to correct the Section 2.3 and Figure 2(a).
March 2017: Journal of Biophotonics
https://www.readbyqxmd.com/read/28362370/transmission-of-multiple-signals-through-an-optical-fiber-using-wavefront-shaping
#20
Daniel Haufe, Nektarios Koukourakis, Lars Büttner, Jürgen W Czarske
The transmission of multiple independent optical signals through a multimode fiber is accomplished using wavefront shaping in order to compensate for the light distortion during the propagation within the fiber. Our methodology is based on digital optical phase conjugation employing only a single spatial light modulator, where the optical wavefront is individually modulated at different regions of the modulator, one region per light signal. Digital optical phase conjugation approaches are considered to be faster than other wavefront shaping approaches, where (for example) a complete determination of the wave propagation behavior of the fiber is performed...
March 20, 2017: Journal of Visualized Experiments: JoVE
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