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https://www.readbyqxmd.com/read/27932701/synthesis-and-characterization-of-fluorescein-grafted-polyurethane-for-potential-application-in-biomedical-tracing
#1
Boyuan Yang, Qin Zou, Lili Lin, Limei Li, Yi Zuo, Yubao Li
Redesigned multifunctional biopolymers represent a novel building bridge for interdisciplinary collaborations in biomaterials development. We prepared fluorescein-grafted polyurethane scaffolds (PU-C1, PU-C5, and PU-B1) to meet both clinical needs and biological safety evaluations, using different contents of calcein and different synthesis procedures for potential biomedical tracing. X-ray diffraction, infrared, X-ray photoelectron spectroscopy, nuclear magnetic resonance, scanning electron microscopy, and light microscopy were used to analyze the composition and structure of polyurethanes, as well as to observe their morphology with and without biomarkers...
December 8, 2016: Journal of Biomaterials Applications
https://www.readbyqxmd.com/read/27929391/a-hyperspectral-survey-of-new-york-city-lighting-technology
#2
Gregory Dobler, Masoud Ghandehari, Steven E Koonin, Mohit S Sharma
Using side-facing observations of the New York City (NYC) skyline, we identify lighting technologies via spectral signatures measured with Visible and Near Infrared (VNIR) hyperspectral imaging. The instrument is a scanning, single slit spectrograph with 872 spectral channels from 0.4-1.0 μ m. With a single scan, we are able to clearly match the detected spectral signatures of 13 templates of known lighting types. However, many of the observed lighting spectra do not match those that have been measured in the laboratory...
December 5, 2016: Sensors
https://www.readbyqxmd.com/read/27928889/synthesis-of-a-molecularly-imprinted-polymer-for-the-selective-recognition-of-carmoisine-azorubin-e122-from-pomegranate-juice
#3
Zahra Ghasempour, Mohammad Alizadeh-Khaledabad, Mohammad-Reza Vardast, Mahmoud Rezazad- Bari
Since natural pigments are lost during the processing of beverages like pomegranate juice, carmoisine, as an adulterant, is often added into the pure juice to improve color characteristics. In this study, molecularly imprinted polymers, as adsorbent of carmoisine, were synthesized using acrylamide, methacrylic acid and 4-vinylpyridine as functional monomers and then they were evaluated in terms of separation and detection of carmoisine. Experiments on batch adsorption of carmoisine 10 ppm stock solution revealed a better binding capacity for 4-vinylpyridine based polymer in comparison to methacrylic acid and acrylamide polymers...
December 8, 2016: Journal of Separation Science
https://www.readbyqxmd.com/read/27928561/near-infrared-photoswitching-of-cyclodextrin-guest-complexes-using-lanthanide-doped-liyf4-upconversion-nanoparticles
#4
Nadja Möller, Tim Hellwig, Lucas Stricker, Sabrina Engel, Carsten Fallnich, Bart Jan Ravoo
This communication reports a new type of supramolecular cyclodextrin-guest complexes using cyclodextrin coated upconversion nanoparticles as hosts and monovalent and divalent azobenzenes and arylazopyrazoles as guests. A potentially biocompatible photocontrol of the interaction by isomerization of the azobenzene or arylazopyrazole was achieved by laser irradiation at 980 nm and a very low light intensity of 0.22 W cm(-2).
December 8, 2016: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/27924933/all-silicon-ultra-broadband-infrared-light-absorbers
#5
Kazim Gorgulu, Abdullah Gok, Mehmet Yilmaz, Kagan Topalli, Necmi Bıyıklı, Ali K Okyay
Absorbing infrared radiation efficiently is important for critical applications such as thermal imaging and infrared spectroscopy. Common infrared absorbing materials are not standard in Si VLSI technology. We demonstrate ultra-broadband mid-infrared absorbers based purely on silicon. Broadband absorption is achieved by the combined effects of free carrier absorption, and vibrational and plasmonic absorption resonances. The absorbers, consisting of periodically arranged silicon gratings, can be fabricated using standard optical lithography and deep reactive ion etching techniques, allowing for cost-effective and wafer-scale fabrication of micro-structures...
December 7, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27923170/instant-detection-and-identification-of-concealed-explosive-related-compounds-induced-stokes-raman-versus-infrared
#6
Sherif Elbasuney, Ashraf F El-Sherif
The instant detection of explosives and explosive-related compounds has become an urgent priority in recent years for homeland security and counter-terrorism applications. Modern techniques should offer enhancement in selectivity, sensitivity, and standoff distances. Miniaturisation, portability, and field-ruggedisation are crucial requirements. This study reports on instant and standoff identification of concealed explosive-related compounds using customized Raman technique. Stokes Raman spectra of common explosive-related compounds were generated and spectrally resolved to create characteristic finger print spectra...
November 30, 2016: Forensic Science International
https://www.readbyqxmd.com/read/27922887/regional-cerebral-abnormalities-measured-by-frequency-domain-near-infrared-spectroscopy-in-pediatric-patients-during-extracorporeal-membrane-oxygenation
#7
Fenghua Tian, Christopher Jenks, Donald Potter, Darryl Miles, Lakshmi Raman
Extracorporeal membrane oxygenation (ECMO) is a form of advanced cardio-respiratory support provided to critically ill patients with severe respiratory and/or cardiovascular failure. While children undergoing ECMO therapy have significant risk for neurological morbidity, currently there is a lack of reliable bedside tool to detect the neurologic events for patients on ECMO. This study assessed the feasibility of frequency-domain near-infrared spectroscopy (NIRS) for detection of intracranial complications during ECMO therapy...
December 2, 2016: ASAIO Journal: a Peer-reviewed Journal of the American Society for Artificial Internal Organs
https://www.readbyqxmd.com/read/27921316/light-triggered-assembly-of-gold-nanoparticles-for-photothermal-therapy-and-photoacoustic-imaging-of-tumors-in-vivo
#8
Xiaju Cheng, Rui Sun, Ling Yin, Zhifang Chai, Haibin Shi, Mingyuan Gao
Photocross-linkable Au nanoparticles are prepared through surface decoration of photolabile diazirine moieties. Both in vitro and in vivo studies indicate that the light-triggered cross-linking can dramatically shift the surface plasmon resonance of Au nanoparticles to near-infrared regions, which in consequence remarkably enhances their efficacy for photothermal therapy and photoacoustic imaging of tumors in vivo.
December 6, 2016: Advanced Materials
https://www.readbyqxmd.com/read/27921102/infrared-spectral-histopathology-using-haematoxylin-and-eosin-h-e-stained-glass-slides-a-major-step-forward-towards-clinical-translation
#9
Michael J Pilling, Alex Henderson, Jonathan H Shanks, Michael D Brown, Noel W Clarke, Peter Gardner
Infrared spectral histopathology has shown great promise as an important diagnostic tool, with the potential to complement current pathological methods. While promising, clinical translation has been hindered by the impracticalities of using infrared transmissive substrates which are both fragile and prohibitively very expensive. Recently, glass has been proposed as a potential replacement which, although largely opaque in the infrared, allows unrestricted access to the high wavenumber region (2500-3800 cm(-1))...
December 6, 2016: Analyst
https://www.readbyqxmd.com/read/27920523/pegylated-and-nanoparticle-conjugated-sulfonium-salt-photo-triggers-necrotic-cell-death
#10
Alaa A Fadhel, Xiling Yue, Ebrahim H Ghazvini Zadeh, Mykhailo V Bondar, Kevin D Belfield
Photodynamic therapy (PDT) processes involving the production of singlet oxygen face the issue of oxygen concentration dependency. Despite high oxygen delivery, a variety of properties related to metabolism and vascular morphology in cancer cells result in hypoxic environments, resulting in limited effectiveness of such therapies. An alternative oxygen-independent agent whose cell cytotoxicity can be remotely controlled by light may allow access to treatment of hypoxic tumors. Toward that end, we developed and tested both polyethylene glycol (PEG)-functionalized and hydrophilic silica nanoparticle (SiNP)-enriched photoacid generator (PAG) as a nontraditional PDT agent to effectively induce necrotic cell death in HCT-116 cells...
2016: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/27918790/near-infrared-light-responsive-liposomal-contrast-agent-for-photoacoustic-imaging-and-drug-release-applications
#11
Kathyayini Sivasubramanian, Malathi Mathiyazhakan, Christian Wiraja, Paul Kumar Upputuri, Chenjie Xu, Manojit Pramanik
No abstract text is available yet for this article.
April 1, 2017: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/27917912/xylanase-treatment-suppresses-light-and-heat-induced-yellowing-of-pulp
#12
Daolei Zhang, Xuezhi Li, Meimei Wang, Yanxin Ye, Jian Du, Xianqin Lu, Jian Zhao
Xylanase is commonly applied in pulp and paper industries to ease cost-related and environmental pressures. The effect of xylanase treatment on pulp bleaching is well-established, however, few studies were conducted on the effects of xylanase treatment in pulp yellowing, especially the mechanism of pulp yellowing inhibition by xylanase treatment. In this study, pure xylanase (EC 3.2.1.8) was applied to treat wheat straw chemical pulp (CP) and poplar chemi-thermo-mechanical pulp (CTMP) to determine their effects on pulp brightness and on light- and heat-induced yellowing...
December 5, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27916697/composition-dependent-structural-changes-and-antitumor-activity-of-asc-dp-dspe-peg-nanoparticles
#13
Kenjirou Higashi, Fusako Mibu, Kengo Saito, Waree Limwikrant, Keiji Yamamoto, Kunikazu Moribe
Ascorbyl 2,6-dipalmitate (ASC-DP) and distearoyl phosphatidylethanolamine polyethylene glycol 2000 (DSPE-PEG) formed stable nanoparticles at a molar ratio of less than or equal to 2:1 after dispersing the solvent-evaporated film in water. The mean particle sizes measured by dynamic light scattering were within the range of ca. 100-160nm. Composition-dependent changes of the ASC-DP and DSPE-PEG molecular states within the film were analyzed by wide-angle X-ray diffraction and infrared (IR) and solid-state nuclear magnetic resonance (NMR) spectroscopy...
December 1, 2016: European Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/27915029/cytotoxicity-study-of-piper-nigrum-seed-mediated-synthesized-sno2-nanoparticles-towards-colorectal-hct116-and-lung-cancer-a549-cell-lines
#14
Sai Kumar Tammina, Badal Kumar Mandal, Shivendu Ranjan, Nandita Dasgupta
Different sized tetragonal tin oxide nanoparticles (SnO2 NPs) were synthesized using Piper nigrum seed extract at three different calcination temperatures (300, 500, 900°C) and these nanoparticles (NPs) were characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), dynamic light scattering (DLS) and Fourier transform infrared spectrophotometry (FT-IR). The optical properties were studied using UV-Vis and photoluminescence (PL) spectrophotometers. The generation of reactive oxygen species (ROS) was monitored by using a fluorescence spectrophotometer and fluorescence microscope...
November 25, 2016: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/27911934/efficacy-of-noninvasive-stellate-ganglion-blockade-performed-using-physical-agent-modalities-in-patients-with-sympathetic-hyperactivity-associated-disorders-a-systematic-review-and-meta-analysis
#15
Chun-De Liao, Jau-Yih Tsauo, Tsan-Hon Liou, Hung-Chou Chen, Chi-Lun Rau
BACKGROUND: Stellate ganglion blockade (SGB) is mainly used to relieve symptoms of neuropathic pain in conditions such as complex regional pain syndrome and has several potential complications. Noninvasive SGB performed using physical agent modalities (PAMs), such as light irradiation and electrical stimulation, can be clinically used as an alternative to conventional invasive SGB. However, its application protocols vary and its clinical efficacy remains controversial. This study investigated the use of noninvasive SGB for managing neuropathic pain or other disorders associated with sympathetic hyperactivity...
2016: PloS One
https://www.readbyqxmd.com/read/27910853/holographic-free-electron-light-source
#16
Guanhai Li, Brendan P Clarke, Jin-Kyu So, Kevin F MacDonald, Nikolay I Zheludev
Recent advances in the physics and technology of light generation via free-electron proximity and impact interactions with nanostructures (gratings, photonic crystals, nano-undulators, metamaterials and antenna arrays) have enabled the development of nanoscale-resolution techniques for such applications as mapping plasmons, studying nanoparticle structural transformations and characterizing luminescent materials (including time-resolved measurements). Here, we introduce a universal approach allowing generation of light with prescribed wavelength, direction, divergence and topological charge via point-excitation of holographic plasmonic metasurfaces...
December 2, 2016: Nature Communications
https://www.readbyqxmd.com/read/27910519/design-of-thomson-scattering-diagnostic-system-on-j-text
#17
Yinan Zhou, Li Gao, Jiefeng Huang, Qingshuang Qiu, Ge Zhuang
An infrared multi-channel Thomson scattering diagnostic system is designed from the viewpoint of development of the proposed system on the Joint Texas Experimental Tokamak (J-TEXT). A 3 J/50 Hz Nd:YAG laser, which is injected vertically into plasma in the direction from top to bottom, serves as the power source of the system. The scattering light is then collected horizontally and is transmitted to an interference-filter avalanche photodiode based polychromater for spectrum analysis. The system covers the half plasma cross section, providing 14 spatial points with 2 cm resolution...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910494/far-infrared-tangential-interferometer-polarimeter-design-and-installation-for-nstx-u
#18
E R Scott, R Barchfeld, P Riemenschneider, C W Domier, C M Muscatello, M Sohrabi, R Kaita, Y Ren, N C Luhmann
The Far-infrared Tangential Interferometer/Polarimeter (FIReTIP) system has been refurbished and is being reinstalled on the National Spherical Torus Experiment-Upgrade (NSTX-U) to supply real-time line-integrated core electron density measurements for use in the NSTX-U plasma control system (PCS) to facilitate real-time density feedback control of the NSTX-U plasma. Inclusion of a visible light heterodyne interferometer in the FIReTIP system allows for real-time vibration compensation due to movement of an internally mounted retroreflector and the FIReTIP front-end optics...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910322/in-vessel-calibration-of-the-imaging-diagnostics-for-the-real-time-protection-of-the-jet-iter-like-wall
#19
V Huber, A Huber, D Kinna, I Balboa, S Collins, N Conway, P Drewelow, C F Maggi, G F Matthews, A G Meigs, Ph Mertens, M Price, G Sergienko, S Silburn, A Wynn, K-D Zastrow
The in situ absolute calibration of the JET real-time protection imaging system has been performed for the first time by means of radiometric light source placed inside the JET vessel and operated by remote handling. High accuracy of the calibration is confirmed by cross-validation of the near infrared (NIR) cameras against each other, with thermal IR cameras, and with the beryllium evaporator, which lead to successful protection of the JET first wall during the last campaign. The operation temperature ranges of NIR protection cameras for the materials used on JET are Be 650-1600 °C, W coating 600-1320 °C, and W 650-1500 °C...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910304/highly-compact-fiber-fabry-perot-interferometer-a-new-instrument-design
#20
B K Nowakowski, D T Smith, S T Smith
This paper presents the design, construction, and characterization of a new optical-fiber-based, low-finesse Fabry-Perot interferometer with a simple cavity formed by two reflecting surfaces (the end of a cleaved optical fiber and a plane, reflecting counter-surface), for the continuous measurement of displacements of several nanometers to several tens of millimeters. No beam collimation or focusing optics are required, resulting in a displacement sensor that is extremely compact (optical fiber diameter 125 μm), is surprisingly tolerant of misalignment (more than 5°), and can be used over a very wide range of temperatures and environmental conditions, including ultra-high-vacuum...
November 2016: Review of Scientific Instruments
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