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https://www.readbyqxmd.com/read/28088116/upconversion-color-tuning-in-ce-3-doped-liyf4-yb-3-ho-3-liyf4-nanoparticles-towards-ratiometric-fluorescence-detection-of-chromium-iii
#1
Shijiang Liu, Yangjie Li, Cheng Zhang, Liang Yang, Tingting Zhao, Ruilong Zhang, Changlong Jiang
Ratiometric fluorescence sensor exhibits advantages of sensitive response, high anti-interference ability and naked eye visualization owing to multiple independent emission peaks utilized for results analysis. To achieve such multi-emission probe, the traditional methods have involved simple mixing of two emitters or tedious synthesis processes of hybrid material. However, these probes often have problems of inconstant emission strength ratio, low light-stability, and complicated synthetic process, which limit their applications in practical field...
January 7, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28071852/environmental-and-excitation-power-effects-on-the-ratiometric-upconversion-luminescence-based-temperature-sensing-using-nanocrystalline-nayf4-yb3-er3
#2
Iko Hyppänen, Niina Perälä, Riikka Arppe, Michael Schäferling, Tero Soukka
The luminescence intensity ratio (LIR) of the green emissions of the near-infrared excited NaYF4:Yb3+,Er3+ nanocrystals is a promising method for temperature sensing. Here, the influence of excitation power density, excitation pulse length, excitation wavelength, silica shell, and solvent on the LIR and its temperature response is reported. Primary objective is to study the LIR mechanism and the impact of measurement and environmental parameters on the calibration and precision of the LIR. The LIR value is demonstrated to be unaffected by the excitation intensity in the studied range...
January 10, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/28063908/laser-angiography-with-indocyanine-green-icg-to-assess-vaginal-cuff-perfusion-during-total-laparoscopic-hysterectomy-tlh-a-pilot-study
#3
Benjamin D Beran, Marie Shockley, Katrin Arnolds, Pedro Escobar, Stephen Zimberg, Michael L Sprague
STUDY OBJECTIVE: To determine feasibility of using laser angiography with ICG to assess vaginal cuff vascular perfusion during TLH. DESIGN: Pilot feasibility trial DESIGN CLASSIFICATION: Canadian Task Force Class II-2 SETTING: Academic-affiliated hospital PATIENTS: Twenty women undergoing TLH for benign disease. INTERVENTIONS: Participants underwent 1:1 randomization of energy method used for colpotomy (ultrasonic versus monopolar) and vaginal cuff closure suture (barbed versus non-barbed)...
January 4, 2017: Journal of Minimally Invasive Gynecology
https://www.readbyqxmd.com/read/28060063/oral-omega-3-fatty-acid-supplementation-for-laser-in-situ-keratomileusis-associated-dry-eye
#4
Parul Goyal, Arun K Jain, Chintan Malhotra
PURPOSE: To determine the effect of oral omega-3 fatty acid (ω3FA) supplementation in laser in situ keratomileusis (LASIK)-associated dry eye. METHODS: In this prospective, open-label study, patients undergoing LASIK were randomized to receive either 1.2 g/d of a triglyceride formulation of oral ω3FA (treatment group) or 400 mg/d vitamin E (control group) for 1 week before and continued for 12 weeks after surgery. Ocular surface disease index, tear breakup time, ocular surface staining, and Schirmer scores were evaluated and compared preoperatively and at 3 months after LASIK...
February 2017: Cornea
https://www.readbyqxmd.com/read/28054685/ultrahigh-sensitive-optical-temperature-sensing-based-on-quasi-thermalized-green-emissions-from-er-zno
#5
Subrata Senapati, Karuna Kar Nanda
Fluorescence intensity ratio (FIR) based optical temperature sensors employ the variation of intensity ratio between two peaks, which are very close to each other. Here, we prepare Er doped ZnO microrods by a hydrothermal route and exploit them for FIR based temperature sensing. The Er:ZnO shows the band-to-band UV emission and broad defect emissions with small Er(3+) related peaks upon excitation with a 355 nm laser, while only peaks corresponding to Er(3+) transitions are observed with 532 nm laser excitation...
January 5, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28050681/detection-of-chlorophylls-in-spores-of-seven-ferns
#6
Mei-Hwei Tseng, Kuei-Huei Lin, Yi-Jia Huang, Ya-Lan Chang, Sheng-Cih Huang, Li-Yaung Kuo, Yao-Moan Huang
Fern spores were traditionally classified into chlorophyllous (green) and nonchlorophyllous (nongreen) types based on the color visible to the naked eye. Recently, a third type, "cryptochlorophyllous spores", is recognized, and these spores are nongreen under white light but contain chlorophylls. Epifluorescence microscopy was previously used to detect chlorophylls in cryptochlorophyllous spores. In addition to epifluorescence microscopy, current study performed some other approaches, including spore-squash epifluorescence, absorption spectra, laser-induced fluorescence emission spectra, thin layer chromatography (TLC), and ultra-high performance liquid chromatography with ultraviolet and mass spectrometric detection (UHPLC-UV-MS) in order to detect chlorophylls of spores of seven ferns (Sphaeropteris lepifera, Ceratopteris thalictroides, Leptochilus wrightii, Leptochilus pothifolius, Lepidomicrosorum buergerianum, Osmunda banksiifolia, and Platycerium grande)...
January 3, 2017: Journal of Plant Research
https://www.readbyqxmd.com/read/28048306/we-fg-bra-04-a-portable-confocal-microscope-to-image-live-cell-damage-response-induced-by-therapeutic-radiation
#7
C McFadden, D Flint, D Sadetaporn, A Asaithamby, D Grosshans, G Sawakuchi
PURPOSE: To construct a custom and portable fluorescence confocal laser-scanning microscope (FCLSM) that can be placed in the path of therapeutic radiation beams to study real-time radiation-induced damage response in live cells. METHODS: We designed and constructed a portable FCLSM with three laser diodes for excitation (405, 488, and 635 nm). An objective lens focuses the excitation light and collects fluorescence from the sample. A pair of galvanometer mirrors scans/collects the laser beam/fluorescence along the focal plane (x/y-directions)...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046468/su-f-t-583-comparison-of-ebt3-radiochromic-film-densitometry-with-narrow-bandwidth-led-source-in-point-slot-and-full-aperture-geometries
#8
K Jordan
PURPOSE: Film densitometers optimized for radiochromic EBT3 film are not commercially available and flatbed document scanners are limited by broad spectral overlap of the red green and blue channels and polarization effects. Non-polarized, narrow bandwith, intensity stabilized light emitting diode (LED) light sources were constructed and transmission measurements compared for point, slot and full aperture geometries. METHODS: LED's with 10 nm bandwidths were focused to 1 mm spots for point scanning...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28043041/detection-of-tissue-factor-positive-extracellular-vesicles-by-laser-scanning-confocal-microscopy
#9
Yohei Hisada, Alyson C Auriemma, Wyeth Alexander, Cihan Ay, Nigel Mackman
INTRODUCTION: Increased levels of tissue factor-positive extracellular vesicles (TF+EVs) have been detected in the plasma of patients with various diseases, including cancer and endotoxemia. Levels of TF+EVs in plasma samples can be measured by antigen and activity assays. The aim of the present study was to visualize TF+EVs by laser scanning confocal microscopy (LSCM). METHODS: EVs were isolated from the supernatant of two cultured human pancreatic cancer cell lines (Panc-1 and BxPc-3), from untreated or lipopolysaccharide (LPS) treated whole blood, and from plasma of pancreatic cancer patients...
December 23, 2016: Thrombosis Research
https://www.readbyqxmd.com/read/28027944/antibiofilm-efficacy-of-green-synthesized-graphene-oxide-silver-nanocomposite-using-lagerstroemia-speciosa-floral-extract-a-comparative-study-on-inhibition-of-gram-positive-and-gram-negative-biofilms
#10
Shatavari Kulshrestha, Shariq Qayyum, Asad U Khan
Biofilm architecture provides bacteria with enhanced antibiotic resistance, thus raising the need to search for alternative therapies that can inhibit the bacterial colonization. In the present study, we synthesized graphene oxide-silver nanocomposite (GO-Ag) by non-toxic and eco-friendly route using a floral extract of Legistromia speciosa (L.) Pers. The gas chromatography-mass spectrometry (GC-MS) analysis of plant extract revealed the presence of compounds which can simultaneously act as reducing and capping agents...
December 24, 2016: Microbial Pathogenesis
https://www.readbyqxmd.com/read/28027821/entrococcus-faecalis-elimination-in-root-canals-using-silver-nanoparticles-photodynamic-therapy-diode-laser-or-laser-activated-nanoparticles-an-in%C3%A2-vitro-study
#11
Farzaneh Afkhami, Saba Akbari, Nasim Chiniforush
INTRODUCTION: The aim of this study was to compare the efficacy of silver nanoparticles (AgNPs), an 810-nm diode laser (DL), conventional photodynamic therapy (PDT) with the use of indocyanine green (ICG) photosensitizer, and modified PDT with the use of AgNPs for the disinfection of root canals inoculated with Enterococcus faecalis. METHODS: The root canals of 65 extracted human single-rooted teeth were prepared, and E. faecalis was incubated in the root canals for 4 weeks...
December 24, 2016: Journal of Endodontics
https://www.readbyqxmd.com/read/28013182/a-review-on-biogenic-synthesis-of-zno-nanoparticles-using-plant-extracts-and-microbes-a-prospect-towards-green-chemistry
#12
Shakeel Ahmed, Annu, Saif Ali Chaudhry, Saiqa Ikram
Nanotechnology is emerging as an important area of research with its tremendous applications in all fields of science, engineering, medicine, pharmacy, etc. It involves the materials and their applications having one dimension in the range of 1-100nm. Generally, various techniques are used for syntheses of nanoparticles (NPs) viz. laser ablation, chemical reduction, milling, sputtering, etc. These conventional techniques e.g. chemical reduction method, in which various hazardous chemicals are used for the synthesis of NPs later become liable for innumerable health risks due to their toxicity and endangering serious concerns for environment, while other approaches are expensive, need high energy for the synthesis of NPs...
December 18, 2016: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28009209/decoupling-electronic-versus-nuclear-photoresponse-of-isolated-green-fluorescent-protein-chromophores-using-short-laser-pulses
#13
Hjalte V Kiefer, Henrik B Pedersen, Anastasia V Bochenkova, Lars H Andersen
The photophysics of a deprotonated model chromophore for the green fluorescent protein is studied by femtosecond laser pulses in an electrostatic ion-storage ring. The laser-pulse duration is much shorter than the time for internal conversion, and, hence, contributions from sequential multiphoton absorption, typically encountered with ns-laser pulses, are avoided. Following single-photon excitation, the action-absorption maximum is shown to be shifted within the S_{0} to S_{1} band from its origin at about 490 to 450 nm, which is explained by the different photophysics involved in the detected action...
December 9, 2016: Physical Review Letters
https://www.readbyqxmd.com/read/28004583/mesoporous-silica-coated-polydopamine-functionalized-reduced-graphene-oxide-for-synergistic-targeted-chemo-photothermal-therapy
#14
Leihou Shao, Ruirui Zhang, Jianqing Lu, Caiyan Zhao, Xiongwei Deng, Yan Wu
The integration of different therapies into a single nanoplatform has shown great promise for synergistic tumor treatment. Herein, mesoporous silica (MS) coated polydopamine functionalized reduced graphene oxide (pRGO) and further modified with hyaluronic acid (HA) (pRGO@MS-HA) has been utilized as a versatile nanoplatform for synergistic targeted chemo-photothermal therapy against cancer. A facile and green chemical method is adopted for the simultaneous reduction and noncovalent functionalization of graphene oxide (GO) by using mussel inspired dopamine (DA) to enhance biocompatibility and photothermal effect...
December 22, 2016: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28001037/photoinitiation-and-inhibition-under-monochromatic-green-light-for-storage-of-colored-3d-images-in-holographic-polymer-dispersed-liquid-crystals
#15
Guannan Chen, Mingli Ni, Haiyan Peng, Feihong Huang, Yonggui Liao, Mingkui Wang, Jintao Zhu, V A L Roy, Xiaolin Xie
Holographic photopolymer composites have garnered a great deal of interest in recent decades, not only because of their advantageous light sensitivity but also due to their attractive capabilities of realizing high capacity three-dimensional (3D) data storage that is long-term stable within two-dimensional (2D) thin films. For achieving high performance holographic photopolymer composites, it is of critical importance to implement precisely spatiotemporal control over the photopolymerization kinetics and gelation during holographic recording...
January 5, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28000781/direct-synthesis-of-graphitic-mesoporous-carbon-from-green-phenolic-resins-exposed-to-subsequent-uv-and-ir-laser-irradiations
#16
Mihai Sopronyi, Felix Sima, Cyril Vaulot, Luc Delmotte, Armel Bahouka, Camelia Matei Ghimbeu
The design of mesoporous carbon materials with controlled textural and structural features by rapid, cost-effective and eco-friendly means is highly demanded for many fields of applications. We report herein on the fast and tailored synthesis of mesoporous carbon by UV and IR laser assisted irradiations of a solution consisting of green phenolic resins and surfactant agent. By tailoring the UV laser parameters such as energy, pulse repetition rate or exposure time carbon materials with different pore size, architecture and wall thickness were obtained...
December 21, 2016: Scientific Reports
https://www.readbyqxmd.com/read/28000244/sensitivity-and-specificity-of-multispectral-imaging-in-detecting-central-serous-chorioretinopathy
#17
Xuemei Zhu, Yong Cheng, Xue Pan, Enzhong Jin, Shanshan Li, Mingwei Zhao, Xiaoxin Li
BACKGROUND AND OBJECTIVE: Central serous chorioretinopathy (CSCR) is a common and idiopathic retinal disorder that affects young to middle aged adults. The aim of this study was to describe the characteristics of eyes with CSCR using a light-emitting diode (LED)-based multispectral imaging (MSI) system and to evaluate the diagnostic reliability of MSI compared to fluorescein angiography (FA) in detecting CSCR. MATERIALS AND METHODS: A total of 56 eyes among 52 patients with 1 or more retinal pigment epithelium (RPE) abnormality were retrospectively enrolled in the study...
December 21, 2016: Lasers in Surgery and Medicine
https://www.readbyqxmd.com/read/27993732/fast-therapeutic-dna-internalization-a-high-potential-transfection-system-based-on-a-peptide-mimicking-cationic-lipid
#18
Christopher Janich, Shashank Reddy Pinnapireddy, Frank Erdmann, Thomas Groth, Andreas Langner, Udo Bakowsky, Christian Wölk
The delivery of nucleic acids into cells is a determining factor for successful gene therapy. In this study we investigate the uptake and time dependent processing of a lipid-based non-viral nucleic acid delivery system composed of a peptide-mimicking cationic lipid (N-{6-amino-1-[N-(9Z)-octadec-9-enylamino]-1-oxohexan-(2S)-2-yl}-N'-{2-[N,N-bis(2-aminoethyl)amino]ethyl}-2-hexadecylpropandiamide - OH4) and a phospholipid (1,2-dioleoyl-sn-glycero-3-phosphoethanolamine - DOPE). Studies by confocal laser scanning microscopy (CLSM) indicate a rapid internalization of fluorescent labelled DNA within 1h...
December 18, 2016: European Journal of Pharmaceutics and Biopharmaceutics
https://www.readbyqxmd.com/read/27990658/identification-of-liver-metastases-with-probe-based-confocal-laser-endomicroscopy-at-two-excitation-wavelengths
#19
Crispin Schneider, Sean P Johnson, Kurinchi Gurusamy, Richard J Cook, Adrien E Desjardins, David J Hawkes, Brian R Davidson, Simon Walker-Samuel
BACKGROUND: Metastasis of colorectal cancer to the liver is the most common indication for hepatic resection in a western population. Incomplete excision of malignancy due to residual microscopic disease normally results in worse patient outcome. Therefore, a method aiding in the real time discrimination of normal and malignant tissue on a microscopic level would be of benefit. MATERIAL AND METHODS: The ability of fluorescent probe-based confocal laser endomicroscopy (pCLE) to identify normal and malignant liver tissue was evaluated in an orthotopic murine model of colorectal cancer liver metastasis (CRLM)...
December 19, 2016: Lasers in Surgery and Medicine
https://www.readbyqxmd.com/read/27990495/optical-coherence-tomography-angiography-in-pediatric-choroidal-neovascularization
#20
Chiara Veronese, Chiara Maiolo, David Huang, Yali Jia, Grayson W Armstrong, Mariachiara Morara, Antonio P Ciardella
PURPOSE: To report two cases of pediatric choroidal neovascularization (CNV) and the associated neo-vascular and retinal findings identified on Optical Coherence Tomography Angiography (OCTA) imaging. METHODS: A 14-year-old boy with handheld laser-induced maculopathy-related CNV and a 13-year-old boy with idiopathic CNV were evaluated with visual acuity testing, slit-lamp exam, fundus photography, fluorescein angiography, indocyanine green angiography, spectral domain optical coherence tomography, and OCTA...
July 2016: American Journal of Ophthalmology Case Reports
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