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James P Reynolds, Kaiyu Zheng, Dmitri A Rusakov
All-optical registration of neuronal and astrocytic activities within the intact mammalian brain has improved significantly with recent advances in optical sensors and biophotonics. However, relating single-synapse release events and local astroglial responses to sensory stimuli in an intact animal has not hitherto been feasible. Here, we present a multiplexed multiphoton excitation imaging approach for assessing the relationship between presynaptic Ca2+ entry at thalamocortical axonal boutons and perisynaptic astrocytic Ca2+ elevations, induced by whisker stimulation in the barrel cortex of C57BL/6 mice...
June 14, 2018: Neuroscience Letters
Robert Kuschmierz, Elias Scharf, Nektarios Koukourakis, Jürgen W Czarske
Coherent fiber bundle (CFB)-based endoscopes enable optical keyhole access in applications such as biophotonics. In conjunction with objective lenses, CFBs allow imaging of intensity patterns. In contrast, digital optical phase conjugation enables lensless holographic endoscopes for the generation of pixelation-free arbitrary light patterns. For real-world applications, however, this requires a non-invasive in situ calibration of the complex optical transfer function of the CFB with only single-sided access...
June 15, 2018: Optics Letters
Carl L Oros, Fabio Alves
Plants have evolved a variety of means to energetically sense and respond to abiotic and biotic environmental stress. Two typical photochemical signaling responses involve the emission of volatile organic compounds and light. The emission of certain leaf wound volatiles and light are mutually dependent upon oxygen which is subsequently required for the wound-induced lipoxygenase reactions that trigger the formation of fatty acids and hydroperoxides; ultimately leading to photon emission by chlorophyll molecules...
2018: PloS One
Martina Mugnano, Pasquale Memmolo, Lisa Miccio, Francesco Merola, Vittorio Bianco, Alessia Bramanti, Antonella Gambale, Roberta Russo, Immacolata Andolfo, Achille Iolascon, Pietro Ferraro
The gold standard methods for anaemia diagnosis are the complete blood count and the peripheral smear observation. However, they do not allow for a complete differential diagnosis, which requires biochemical assays, thus being label-dependent techniques. On the other hand, recent studies focus on label-free quantitative phase imaging (QPI) of blood samples to investigate blood diseases by using video-based morphological methods. However, when sick cells are very similar to healthy ones in terms of morphometric features identification of a blood disease becomes challenging even by morphometric as well as QPI...
May 24, 2018: Analytical Chemistry
Max Diem
The search for disease markers in whole blood, or easily accessible blood components by spectral methods is a highly important aspect in the field of biophotonic research for disease diagnostics and screening, since it promises a minimally invasive approach to assess an individual's state of health. Fourier transform infrared spectroscopy, in particular, promises to be a fast, inexpensive method to search for markers of disease, since it detects variation in the proteome, lipidome and metabolome of biofluids, or activation of immune cells...
May 18, 2018: Journal of Biophotonics
Richard Kalman, Andrew Stawarz, David Nunes, Di Zhang, Mart A Dela Cruz, Arpan Mohanty, Hariharan Subramanian, Vadim Backman, Hemant K Roy
PURPOSE: Hepatocellular carcinoma (HCC) results from chronic inflammation/cirrhosis. Unfortunately, despite use of radiological/serological screening techniques, HCC ranks as a leading cause of cancer deaths. Our group has used alterations in high order chromatin as a marker for field carcinogenesis and hence risk for a variety of cancers (including colon, lung, prostate, ovarian, esophageal). In this study we wanted to address whether these chromatin alterations occur in HCC and if it could be used for risk stratification...
2018: PloS One
Xiaoyuan Lu, Tongyi Zhang, Rengang Wan, Yongtao Xu, Changhong Zhao, Sheng Guo
Metasurfaces are investigated intensively for biophotonics applications due to their resonant wavelength flexibly tuned in the near infrared region specially matching biological tissues. Here, we present numerically a metasurface structure combining dielectric resonance with surface plasmon mode of a metal plane, which is a perfect absorber with a narrow linewidth 10 nm wide and quality factor 120 in the near infrared regime. As a sensor, its bulk sensitivity and bulk figure of merit reach respectively 840 nm/RIU and 84/RIU, while its surface sensitivity and surface figure of merit are respectively 1 and 0...
April 16, 2018: Optics Express
Lei Hou, Hongyu Guo, Yonggang Wang, Jiang Sun, Qimeng Lin, Yang Bai, Jintao Bai
Ultrafast fiber laser light sources attract enormous interest due to the booming applications they are enabling, including long-distance communication, optical metrology, detecting technology of infra-biophotons, and novel material processing. In this paper, we demonstrate 175 fs dispersion-managed soliton (DMS) mode-locked ytterbium-doped fiber (YDF) laser based on single-walled carbon nanotubes (SWCNTs) saturable absorber (SA). The output DMSs have been achieved with repetition rate of 21.2 MHz, center wavelength of 1025...
April 2, 2018: Optics Express
Vinayak Narasimhan, Radwanul Hasan Siddique, Jeong Oen Lee, Shailabh Kumar, Blaise Ndjamen, Juan Du, Natalie Hong, David Sretavan, Hyuck Choo
Numerous living organisms possess biophotonic nanostructures that provide colouration and other diverse functions for survival. While such structures have been actively studied and replicated in the laboratory, it remains unclear whether they can be used for biomedical applications. Here, we show a transparent photonic nanostructure inspired by the longtail glasswing butterfly (Chorinea faunus) and demonstrate its use in intraocular pressure (IOP) sensors in vivo. We exploit the phase separation between two immiscible polymers (poly(methyl methacrylate) and polystyrene) to form nanostructured features on top of a Si3 N4 substrate...
June 2018: Nature Nanotechnology
Na Dong, Rolando Berlinguer-Palmini, Ahmed Soltan, Nikhil Ponon, Anthony O'Neil, Andrew Travelyan, Pleun Maaskant, Patrick Degenaar, Xiaohan Sun
Implantable photonic probes are of increasing interest to the field of biophotonics and in particular, optogenetic neural stimulation. Active probes with onboard light emissive elements allow for electronic multiplexing and can be manufactured through existing microelectronics methods. However, as the optogenetics field moves towards clinical practice, an important question arises as to whether such probes will cause excessive thermal heating of the surrounding tissue. Light emitting diodes typically produce more heat than light...
March 30, 2018: Journal of Biophotonics
Yu Chen, Minghuai Yu, Shuai Ye, Jun Song, Junle Qu
Lead halide perovskite nanocrystals with efficient two-photon absorption and ease of achieving population inversion have been recognized as good candidates to achieve frequency up-conversion for biophotonics applications, but suffer from the limitation of the miniaturization of the device and its corresponding poor stability when exposed to atmospheric moisture. Here we demonstrate the miniaturization of plasmonic nanolasers via embedding perovskite quantum dots (QDs) in rationally designed dual-mesoporous silica with gold nanocore...
April 5, 2018: Nanoscale
Nassima Chouaki-Benmansour, Kilian Ruminski, Anne-Marie Sartre, Marie-Claire Phelipot, Audrey Salles, Elise Bergot, Ambroise Wu, Gaëtan Chicanne, Mathieu Fallet, Sophie Brustlein, Cyrille Billaudeau, Anthony Formisano, Sébastien Mailfert, Bernard Payrastre, Didier Marguet, Sophie Brasselet, Yannick Hamon, Hai-Tao He
Phosphoinositides (PIs) play important roles in numerous membrane-based cellular activities. However, their involvement in the mechanism of T cell receptor (TCR) signal transduction across the plasma membrane (PM) is poorly defined. Here, we investigate their role, and in particular that of phosphatidylinositol 4,5-bisphosphate [PI(4,5)P2] in TCR PM dynamics and activity in a mouse T-cell hybridoma upon ectopic expression of a PM-localized inositol polyphosphate-5-phosphatase (Inp54p). We observed that dephosphorylation of PI(4,5)P2 by the phosphatase increased the TCR/CD3 complex PM lateral mobility prior stimulation...
March 21, 2018: Scientific Reports
Lu Han, Shunai Che
Triply periodic minimal surface structures and related geometries are widely identified in many natural systems, such as biological membranes and biophotonic structures in butterfly-wing scales. Inspired by their marvelous and highly symmetrical structures and optimized physical properties, these structures have sparked immense interest for creating novel materials by extracting the design from nature. Significant progress has been made to understand these biological structures and fabricate artificial materials by top-down and bottom-up approaches for numerous applications in chemistry and materials science...
April 2018: Advanced Materials
Paul Campagnola, Daniel Cote, Francesco Pavone, Peter Reece, Vivek J Srinivasan, Tomasz Tkaczyk, Giovanni Volpe
We introduce the feature issue on the Optics in the Life Sciences Congress held on April 2-5, 2017 in San Diego, CA. The Congress consisted of 5 topical symposia: (i) Bio-optics Design and Application; (ii) Novel Techniques in Microscopy; (iii) Optical Molecular Probes, Imaging and Drug Delivery; (iv) Optical Trapping Applications; and (v) Optics and the Brain. These separate symposia also held joint sessions of common interest. The following highlights some of the topics from the Congress.
March 1, 2018: Biomedical Optics Express
(no author information available yet)
This publisher's note explains the change in citation data for 3 articles.
March 2018: Journal of Biomedical Optics
S U Rahman, R C Mosca, S Govindool Reddy, S C Nunez, S Andreana, T S Mang, P R Arany
This narrative review on the use of biophotonics therapies for management of oral diseases is written as a tribute to Prof. Crispian Scully. His seminal contributions to the field are highlighted by the detailed, comprehensive description of clinical presentations of oral diseases. This has enabled a more thorough, fundamental understanding of many of these pathologies by research from his group as well as inspired mechanistic investigations in many groups globally. In the same vein, a major emphasis of this narrative review is to focus on the evidence from human case reports rather than in vitro or in vivo animal studies that showcases the growing and broad impact of biophotonics therapies...
March 2018: Oral Diseases
Carmel Mothersill, Richard Smith, Jiaxi Wang, Andrej Rusin, Cris Fernandez-Palomo, Jennifer Fazzari, Colin Seymour
The phenomenon by which irradiated organisms including cells in vitro communicate with unirradiated neighbors is well established in biology as the radiation-induced bystander effect (RIBE). Generally, the purpose of this communication is thought to be protective and adaptive, reflecting a highly conserved evolutionary mechanism enabling rapid adjustment to stressors in the environment. Stressors known to induce the effect were recently shown to include chemicals and even pathological agents. The mechanism is unknown but our group has evidence that physical signals such as biophotons acting on cellular photoreceptors may be implicated...
January 2018: Dose-response: a Publication of International Hormesis Society
Michelle Le, Fiona E McNeill, Colin B Seymour, Andrej Rusin, Kevin Diamond, Andrew J Rainbow, James Murphy, Carmel E Mothersill
Radiation-induced biophotons are an electromagnetic form of bystander signalling. In human cells, biophoton signalling is capable of eliciting effects in non-irradiated bystander cells. However, the mechanisms by which the biophotons interact and act upon the bystander cells are not clearly understood. Mitochondrial energy production and ROS are known to be involved but the precise interactions are not known. To address this question, we have investigated the effect of biophoton emission upon the function of the complexes of oxidative phosphorylation (OXPHOS)...
May 2018: Environmental Research
Bruno Bordoni, Fabiola Marelli, Bruno Morabito, Beatrice Sacconi
Every body structure is wrapped in connective tissue or fascia, creating a structural continuity that gives form and function to every tissue and organ. The fascial tissue is uniformly distributed throughout the body, enveloping, interacting with and permeating blood vessels, nerves, viscera, meninges, bones and muscles, creating various layers at different depths and forming a tridimensional metabolic and mechanical matrix. This article reviews the literature on the emission of biophotons and adjustable sounds by the fascial system, because these biological changes could be a means of local and systemic cellular communication and become another assessment tool for manual (therapy) practitioners...
January 2018: Journal of evidence-based integrative medicine
Ulyana Shimanovich, Dorothea Pinotsi, Klimentiy Shimanovich, Na Yu, Sreenath Bolisetty, Jozef Adamcik, Raffaele Mezzenga, Jerome Charmet, Fritz Vollrath, Ehud Gazit, Christopher M Dobson, Gabriele Kaminski Schierle, Chris Holland, Clemens F Kaminski, Tuomas P J Knowles
Native silk fibroin (NSF) is a unique biomaterial with extraordinary mechanical and biochemical properties. These key characteristics are directly associated with the physical transformation of unstructured, soluble NSF into highly organized nano- and microscale fibrils rich in β-sheet content. Here, it is shown that this NSF fibrillation process is accompanied by the development of intrinsic fluorescence in the visible range, upon near-UV excitation, a phenomenon that has not been investigated in detail to date...
April 2018: Macromolecular Bioscience
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