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https://www.readbyqxmd.com/read/28630678/on-the-colour-of-wing-scales-in-butterflies-iridescence-and-preferred-orientation-of-single-gyroid-photonic-crystals
#1
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
#2
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...
June 16, 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
#3
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
#4
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
#5
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
#6
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
#7
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
#8
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
#9
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
#10
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
#11
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
#12
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
#13
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
https://www.readbyqxmd.com/read/28334333/special-section-guest-editorial-translational-biophotonics
#14
Tomasz Tkaczyk, Michal Pawlowski, Mark Pierce
No abstract text is available yet for this article.
March 1, 2017: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/28331616/ex-vivo-akt-inhibition-promotes-the-generation-of-potent-cd19car-t-cells-for-adoptive-immunotherapy
#15
Ryan Urak, Miriam Walter, Laura Lim, ChingLam W Wong, Lihua E Budde, Sandra Thomas, Stephen J Forman, Xiuli Wang
BACKGROUND: Insufficient persistence and effector function of chimeric antigen receptor (CAR)-redirected T cells have been challenging issues for adoptive T cell therapy. Generating potent CAR T cells is of increasing importance in the field. Studies have demonstrated the importance of the Akt pathway in the regulation of T cell differentiation and memory formation. We now investigate whether inhibition of Akt signaling during ex vivo expansion of CAR T cells can promote the generation of CAR T cells with enhanced antitumor activity following adoptive therapy in a murine leukemia xenograft model...
2017: Journal for Immunotherapy of Cancer
https://www.readbyqxmd.com/read/28294270/ultra-weak-photon-emission-in-healthy-subjects-and-patients-with-type-2-diabetes-evidence-for-a-non-invasive-diagnostic-tool
#16
Meina Yang, Wenyu Ding, Yanli Liu, Hua Fan, Rajendra P Bajpai, Jialei Fu, Jingxiang Pang, Xiaolei Zhao, Jinxiang Han
BACKGROUND: Spontaneous ultra-weak photon emission (UPE) is a common phenomenon in biological systems and has been linked to pathological states. Researchers have always considered ultra-weak photon emission a potential non-invasive diagnostic tool, but its application in the medical field is stagnant due to the lack of relevant data for pathological states. METHODS: Ultra-weak photon signals from five body sites (forehead, neck, heart, stomach, and navel) in fifty patients with type 2 diabetes and sixty age-matched healthy subjects were measured using a moveable whole-body biophoton detection system...
May 17, 2017: Photochemical & Photobiological Sciences
https://www.readbyqxmd.com/read/28285197/graphene-oxide-functionalized-long-period-grating-for-ultrasensitive-label-free-immunosensing
#17
Chen Liu, Qi Cai, Baojian Xu, Weidong Zhu, Lin Zhang, Jianlong Zhao, Xianfeng Chen
We explore graphene oxide (GO) nanosheets functionalized dual-peak long period grating (dLPG) based biosensor for ultrasensitive label-free antibody-antigen immunosensing. The GO linking layer provides a remarkable analytical platform for bioaffinity binding interface due to its favorable combination of exceptionally high surface-to-volume ratio and excellent optical and biochemical properties. A new GO deposition technique based on chemical-bonding in conjunction with physical-adsorption was proposed to offer the advantages of a strong bonding between GO and fiber device surface and a homogeneous GO overlay with desirable stability, repeatability and durability...
March 9, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28278290/exosomes-are-released-by-bystander-cells-exposed-to-radiation-induced-biophoton-signals-reconciling-the-mechanisms-mediating-the-bystander-effect
#18
Michelle Le, Cristian Fernandez-Palomo, Fiona E McNeill, Colin B Seymour, Andrew J Rainbow, Carmel E Mothersill
OBJECTIVE: The objective of our study was to explore a possible molecular mechanism by which ultraviolet (UV) biophotons could elicit bystander responses in reporter cells and resolve the problem of seemingly mutually exclusive mechanisms of a physical UV signal & a soluble factor-mediated bystander signal. METHODS: The human colon carcinoma cell line, HCT116 p53 +/+, was directly irradiated with 0.5 Gy tritium beta particles to induce ultraviolet biophoton emission...
2017: PloS One
https://www.readbyqxmd.com/read/28276967/near-infrared-biophotonics-based-nanodrug-release-systems-and-their-potential-application-for-neuro-disorders
#19
Vidya Sagar, Madhavan Nair
Near-infrared ray (NIR)-responsive 'smart' nanoagents allow spatial and temporal control over the drug delivery process, noninvasively, without affecting healthy tissues and therefore they possess high potential for on-demand, targeted drug/gene delivery. Various NIR-responsive drug/gene delivery techniques are under investigation for peripheral disorders (especially for cancer). Nonetheless, their potential not been extensively examined for brain biomedical application. Areas covered: This review focuses on NIR-responsive characteristics of different NIR-nanobiophotonics-based nanoagents and associated drug delivery strategies...
February 28, 2017: Expert Opinion on Drug Delivery
https://www.readbyqxmd.com/read/28253906/molecular-imaging-of-nestin-in-neuroinflammatory-conditions-reveals-marked-signal-induction-in-activated-microglia
#20
Senthil Krishnasamy, Yuan-Cheng Weng, Sai Sampath Thammisetty, Daniel Phaneuf, Melanie Lalancette-Hebert, Jasna Kriz
BACKGROUND: Nestin is a known marker of neuronal progenitor cells in the adult brain. Following neuro- and gliogenesis, nestin is replaced by cell type-specific intermediate filaments, e.g., neurofilaments for panneuronal expression and glial fibrillary acidic protein as a specific marker of mature astrocytes. While previous work have been mostly focused on the neuronal fate of nestin-positive progenitors, in the present study, we sought to investigate in real time how nestin signals and cellular expression patterns are controlled in the context of neuroinflammatory challenge and ischemic brain injury...
March 3, 2017: Journal of Neuroinflammation
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