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https://www.readbyqxmd.com/read/28646682/sensing-nadh-conformation-using-phasor-analysis-on-fluorescence-spectra
#1
Dylan Palo, Jeff Maltas, Laxmi Risal, Paul Urayama
Phasor analysis on fluorescence signals is a sensitive approach for analyzing multicomponent systems. Initially developed for time-resolved measurements, a spectral version has been used for the rapid identification of regions during the spectral imaging of biological systems. Here we show that quantitative information regarding conformation can be obtained from phasor analysis of fluorescence spectrum shape. Methanol denaturation of NADH and NADH binding to various dehydrogenase proteins are used as model reactions...
June 8, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28644304/abnormal-retinal-reflectivity-to-short-wavelength-light-in-type-2-idiopathic-macular-telangiectasia
#2
Ferenc B Sallo, Irene Leung, Meike Zeimer, Traci E Clemons, Adam M Dubis, Marcus Fruttiger, Daniel Pauleikhoff, Emily Y Chew, Catherine Egan, Tunde Peto, Alan C Bird
PURPOSE: Macular telangiectasia Type 2 (MacTel) is a bilateral, progressive, potentially blinding retinal disease characterized by vascular and neurodegenerative signs, including an increased parafoveal reflectivity to blue light. Our aim was to investigate the relationship of this sign with other signs of macular telangiectasia Type 2 in multiple imaging modalities. METHODS: Participants were selected from the MacTel Type 2 study, based on a confirmed diagnosis and the availability of images...
June 21, 2017: Retina
https://www.readbyqxmd.com/read/28641813/sensors-and-bioassays-powered-by-upconverting-materials
#3
REVIEW
Diego Mendez-Gonzalez, Enrique Lopez-Cabarcos, Jorge Rubio-Retama, Marco Laurenti
In recent years, considerable efforts have been done to better understand the peculiar emission properties of upconverting materials due to their widespread applications in different and important technological fields such as upconversion-based photoactivated cancer therapies, photoactivated drug-delivery, magnetic resonance imaging contrast agents, bioimaging. However, one of the most promising applications of upconverting materials concerns the field of sensing, due to their unique emission properties. In fact, the minimal autofluorescence, blinking, photo-bleaching, and high photostability makes them an excellent alternative to organic dyes or quantum dots...
June 10, 2017: Advances in Colloid and Interface Science
https://www.readbyqxmd.com/read/28638436/in-vivo-label-free-mapping-of-the-effect-of-a-photosystem-ii-inhibiting-herbicide-in-plants-using-chlorophyll-fluorescence-lifetime
#4
Elizabeth Noble, Sunil Kumar, Frederik G Görlitz, Chris Stain, Chris Dunsby, Paul M W French
BACKGROUND: In order to better understand and improve the mode of action of agrochemicals, it is useful to be able to visualize their uptake and distribution in vivo, non-invasively and, ideally, in the field. Here we explore the potential of plant autofluorescence (specifically chlorophyll fluorescence) to provide a readout of herbicide action across the scales utilising multiphoton-excited fluorescence lifetime imaging, wide-field single-photon excited fluorescence lifetime imaging and single point fluorescence lifetime measurements via a fibre-optic probe...
2017: Plant Methods
https://www.readbyqxmd.com/read/28637922/targeting-factor-d-of-the-alternative-complement-pathway-reduces-geographic-atrophy-progression-secondary-to-age-related-macular-degeneration
#5
Brian L Yaspan, David F Williams, Frank G Holz, Carl D Regillo, Zhengrong Li, Amy Dressen, Menno van Lookeren Campagne, Kha N Le, Robert R Graham, Tatiana Beres, Tushar R Bhangale, Lee A Honigberg, Ashley Smith, Erin C Henry, Carole Ho, Erich C Strauss
Geographic atrophy is an advanced form of age-related macular degeneration (AMD) and a leading cause of vision loss for which there are no approved treatments. Genetic studies in AMD patients have implicated dysregulation of the alternative complement pathway in the pathogenesis of geographic atrophy. Lampalizumab is a potential therapeutic that targets complement factor D, a pivotal activator of the alternative complement pathway. The MAHALO phase 2 clinical trial was a multicenter, randomized, controlled study that evaluated lampalizumab administered by intravitreal injection monthly (n = 42) and every other month (n = 41) versus sham control (n = 40) in patients with geographic atrophy secondary to AMD...
June 21, 2017: Science Translational Medicine
https://www.readbyqxmd.com/read/28635519/the-elicitor-protein-ases-induces-a-sar-response-accompanied-by-systemic-microbursts-and-micro-hrs-in-fragaria-ananassa
#6
Verónica Hael Conrad, Silvia Marisa Perato, Marta Elena Arias, Martín Gustavo Martínez Zamora, Pía de Los Ángeles Di Peto, Gustavo Gabriel Martos, Atilio Pedro Castagnaro, Juan Carlos Diaz-Ricci, Nadia Regina Chalfoun
The elicitor AsES (Acremonium strictum Elicitor Subtilisin) is a 34 KDa subtilisin-like protein secreted by the opportunistic fungus Acremonium strictum. AsES activates the innate immunity and confers resistance against anthracnose and grey mold diseases in strawberry plants (Fragaria x ananassa Duch.) and the last disease also in Arabidopsis. In the present work, we show that upon AsES recognition, a cascade of defense responses is activated, including: calcium influx, biphasic oxidative burst (O2(.-) and H2O2), HR response, accumulation of autofluorescent compounds, cell wall reinforcement with callose and lignin deposition, salicylic acid accumulation, and expression of defense-related genes such as FaPR1, FaPG1, FaMYB30, FaRBOH-D, FaRBOH-F, FaCHI23 and FaFLS...
June 21, 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28635425/multimodal-imaging-in-cabp4-related-retinopathy
#7
Patrik Schatz, Maram E A Abdalla Elsayed, Arif O Khan
PURPOSE: Multimodal imaging has not been documented for CABP4-related retinopathy. In this study, we describe optical coherence tomography (OCT) and fundus autofluorescence findings for five genetically confirmed cases. METHODS: Retrospective case series. RESULTS: Four patients with the previously described homozygous Saudi CABP4 founder mutation c.81_82insA (p.Pro28ThrfsX44) and one patient with the homozygous mutation c.1A>G (p.Met1?) in CABP4 were examined...
March 1, 2017: Ophthalmic Genetics
https://www.readbyqxmd.com/read/28633153/association-between-visual-function-and-subretinal-drusenoid-deposits-in-normal-and-early-age-related-macular-degeneration-eyes
#8
David Neely, Anna V Zarubina, Mark E Clark, Carrie E Huisingh, Gregory R Jackson, Yuhua Zhang, Gerald McGwin, Christine A Curcio, Cynthia Owsley
PURPOSE: To examine the association between subretinal drusenoid deposits (SDDs) identified by multimodal retinal imaging and visual function in older eyes with normal macular health or in the earliest phases of age-related macular degeneration (AMD). METHODS: Age-related macular degeneration status for each eye was defined according to the Age-Related Eye Disease Study (AREDS) 9-step classification system (normal = Step 1, early AMD = Steps 2-4) based on color fundus photographs...
July 2017: Retina
https://www.readbyqxmd.com/read/28632841/green-light-autofluorescence-versus-combined-blue-light-autofluorescence-and-near-infrared-reflectance-imaging-in-geographic-atrophy-secondary-to-age-related-macular-degeneration
#9
Maximilian Pfau, Lukas Goerdt, Steffen Schmitz-Valckenberg, Matthias M Mauschitz, Divyansh K Mishra, Frank G Holz, Moritz Lindner, Monika Fleckenstein
Purpose: To compare the intermodality and interreader agreement for geographic atrophy (GA) lesion size quantification in green-light fundus autofluorescence (GAF; excitation = 518 nm) versus combined blue-light fundus autofluorescence (BAF; excitation = 488 nm) and near-infrared reflectance (NIR; 820 nm) -based grading. Methods: Confocal scanning laser ophthalmoscopy (cSLO) GAF, BAF, and NIR images of 40 eyes from 29 patients (mean age 79.7 years) with GA secondary to AMD were recorded according to a standardized protocol...
May 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28632785/the-association-between-various-smoking-behaviors-cotinine-biomarkers-and-skin-autofluorescence-a-marker-for-advanced-glycation-end-product-accumulation
#10
Robert P van Waateringe, Marjonneke J Mook-Kanamori, Sandra N Slagter, Melanie M van der Klauw, Jana V van Vliet-Ostaptchouk, Reindert Graaff, Helen L Lutgers, Karsten Suhre, Mohammed M El-Din Selim, Dennis O Mook-Kanamori, Bruce H R Wolffenbuttel
BACKGROUND: Skin autofluorescence, a biomarker for advanced glycation end products (AGEs) accumulation, has been shown to predict diabetes-related cardiovascular complications and is associated with several environmental and lifestyle factors. In the present study, we examined the association between various smoking behaviors and skin autofluorescence, as well as the association between several cotinine biomarkers and skin autofluorescence, using both epidemiological and metabolomics data...
2017: PloS One
https://www.readbyqxmd.com/read/28630947/evolution-of-geographic-atrophy-in-participants-treated-with-ranibizumab-for-neovascular-age-related-macular-degeneration
#11
Alisa T Thavikulwat, Naima Jacobs-El, Jane S Kim, Elvira Agrón, Jesia Hasan, Catherine B Meyerle, David Valent, Catherine A Cukras, Henry E Wiley, Wai T Wong, Emily Y Chew
PURPOSE: To evaluate the risk factors, incidence, and rate of progression of geographic atrophy (GA) in eyes with neovascular age-related macular degeneration (nAMD) treated with ranibizumab. DESIGN: Post-hoc analysis of a prospective clinical study. PARTICIPANTS: 69 participants with nAMD in at least one eye. METHODS: Participants were prospectively treated in the study eye with 0.5 mg intravitreal ranibizumab. Study eyes received 4 monthly injections followed by pro re nata injections until a fluid-free macula was achieved on optical coherence tomography...
January 2017: Ophthalmology retina
https://www.readbyqxmd.com/read/28629007/upconverting-and-persistent-luminescent-nanocarriers-for-accurately-imaging-guided-photothermal-therapy
#12
Peiqi Zhao, Wei Ji, Shiyong Zhou, Lihua Qiu, Lanfang Li, Zhengzi Qian, Xianming Liu, Huilai Zhang, Xuchen Cao
The fluorescence-guided photothermal therapy (FPTT) has great potential in cancer treatment. However, the conventional FPTT has to be stimulated by external light, which tends to increase background noise and leads to the inaccurate infrared light irradiation for PTT. In this study, upconverting and persistent luminescent nanocarriers (UPLNs) loaded mesoporous silica nanoparticles (UPLNs@mSiO2) were first designed to solve the problem mentioned above. The UPLNs cores can effectively reduce the short-lived autofluorescence interference by exerting the delay time between signal acquisition and pulsed excitation light...
October 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28628294/fused-deposition-modeling-3d-printing-for-bio-analytical-device-fabrication-procedures-materials-and-applications
#13
Gert Ij Salentijn, Pieter E Oomen, Maciej Grajewski, Elisabeth Verpoorte
In this work, the use of fused deposition modeling (FDM) in a (bio)analytical/lab-on-a-chip research laboratory is described. First, the specifications of this 3D printing method that are important for the fabrication of (micro)devices were characterized for a benchtop FDM 3D printer. These include resolution, surface roughness, leakage, transparency, material deformation, and the possibilities for integration of other materials. Next, the autofluorescence, solvent compatibility, and biocompatibility of 12 representative FDM materials were tested and evaluated...
June 19, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28626824/atypical-chronic-central-serous-chorioretinopathy-with-cystoid-macular-edema-therapeutic-response-to-medical-and-laser-therapy
#14
Jiun L Do, Lisa C Olmos de Koo, Hossein Ameri
PURPOSE: To describe an atypical case of chronic central serous chorioretinopathy (CSCR). METHODS: A 58-year-old man with longstanding, bilateral visual impairment was self-referred for a second opinion. RESULTS: Findings by direct ophthalmoscopy, optical coherence tomography, fluorescein angiography, and fundus autofluorescence (FAF) were suggestive of atypical, chronic CSCR. Treatment with oral anti-mineralocorticoids resulted in moderate improvement, and photodynamic therapy (PDT) had minimal effect...
June 2017: Journal of Current Ophthalmology
https://www.readbyqxmd.com/read/28626555/live-imaging-of-follicle-stimulating-hormone-receptors-in-gonads-and-bones-using-near-infrared-ii-fluorophore
#15
Yi Feng, Shoujun Zhu, Alexander L Antaris, Hao Chen, Yuling Xiao, Xiaowei Lu, Linlin Jiang, Shuo Diao, Kuai Yu, Yan Wang, Sonia Herraiz, Jingying Yue, Xuechuan Hong, Guosong Hong, Zhen Cheng, Hongjie Dai, Aaron J Hsueh
In vivo imaging of hormone receptors provides the opportunity to visualize target tissues under hormonal control in live animals. Detecting longer-wavelength photons in the second near-infrared window (NIR-II, 1000-1700 nm) region affords reduced photon scattering in tissues accompanied by lower autofluorescence, leading to higher spatial resolution at up to centimeter tissue penetration depths. Here, we report the conjugation of a small molecular NIR-II fluorophore CH1055 to a follicle stimulating hormone (FSH-CH) for imaging ovaries and testes in live mice...
May 1, 2017: Chemical Science
https://www.readbyqxmd.com/read/28623341/metabolic-fingerprinting-of-bacteria-by-fluorescence-lifetime-imaging-microscopy
#16
Arunima Bhattacharjee, Rupsa Datta, Enrico Gratton, Allon I Hochbaum
Bacterial populations exhibit a range of metabolic states influenced by their environment, intra- and interspecies interactions. The identification of bacterial metabolic states and transitions between them in their native environment promises to elucidate community behavior and stochastic processes, such as antibiotic resistance acquisition. In this work, we employ two-photon fluorescence lifetime imaging microscopy (FLIM) to create a metabolic fingerprint of individual bacteria and populations. FLIM of autofluorescent reduced nicotinamide adenine dinucleotide (phosphate), NAD(P)H, has been previously exploited for label-free metabolic imaging of mammalian cells...
June 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28614139/multiple-evanescent-white-dot-syndrome-with-subretinal-deposits
#17
Orly Gal-Or, John A Sorenson, Sarra Gattoussi, Rosa Dolz-Marco, K Bailey Freund
PURPOSE: To describe the multimodal imaging findings of transient subretinal deposits occurring in multiple evanescent white dot syndrome (MEWDS). METHODS: The multimodal imaging characteristics of transient subretinal deposits occurring in MEWDS were investigated with ultra-widefield color and fundus autofluorescence, cross-sectional and en-face optical coherence tomography (OCT), en face OCT-angiography, and quantitative autofluorescence. RESULTS: A 28-year-old woman presented with photopsia and temporal visual field loss in her right eye...
June 13, 2017: Retinal Cases & Brief Reports
https://www.readbyqxmd.com/read/28614138/acute-exudative-paraneoplastic-polymorphous-vitelliform-maculopathy-during-vemurafenib-and-pembrolizumab-treatment-for-metastatic-melanoma
#18
Harpal S Sandhu, Anton M Kolomeyer, Marisa K Lau, Carol L Shields, Lynn M Schuchter, Charles W Nichols, Tomas S Aleman
PURPOSE: To describe a patient with BRAF mutation-positive cutaneous melanoma who developed acute exudative polymorphous vitelliform maculopathy during vemurafenib and pembrolizumab treatment for metastatic melanoma. METHODS: Retrospective case report documented with wide-field fundus imaging, spectral domain optical coherence tomography, and fundus autofluorescence imaging. RESULTS: A 55-year-old woman with bilateral ductal breast carcinoma and BRAF mutation-positive metastatic cutaneous melanoma complained of bilateral blurred vision within 5 days of starting vemurafenib (BRAF inhibitor)...
June 13, 2017: Retinal Cases & Brief Reports
https://www.readbyqxmd.com/read/28613848/near-infrared-optical-imaging-of-necrotic-cells-by-photostable-lanthanide-based-metallacrowns
#19
Ivana Martinić, Svetlana V Eliseeva, Tu N Nguyen, Vincent L Pecoraro, Stéphane Petoud
Sensitive detection of cell necrosis is crucial for the determination of cell viability. Because of its high resolution at the cellular level and sensitivity, optical imaging is highly attractive for identifying cell necrosis. However, challenges associated with this technique remain present such as the rapid photobleaching of several types of organic fluorophores and/or the interference generated by biological autofluorescence. Herein, we synthesized novel biologically compatible Zn(2+)/Ln(3+) metallacrowns (MCs) that possess attractive near-infrared (NIR) emission and are highly photostable...
June 14, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28613824/a-multifunctional-tunable-mof-materials-platform-for-bio-imaging-applications
#20
Dorina F Sava Gallis, Lauren E Shea-Rohwer, Mark A Rodriguez, Meghan C Barnhart-Dailey, Kimberly S Butler, Ting S Luk, Jerilyn A Timlin, Karena W Chapman
Herein we describe a novel multifunctional metal-organic framework (MOF) materials platform that displays both porosity and tunable emission properties as a function of the metal identity (Eu, Nd, and tuned compositions of Nd/Yb). Their emission collectively spans the deep red to near-infrared (NIR) spectral region (~ 614 - 1350 nm), which is highly relevant for in vivo bio-imaging. These new materials meet important prerequisites as relevant to biological processes: they are minimally toxic to living cells, and retain structural integrity in water and phosphate buffered saline...
June 14, 2017: ACS Applied Materials & Interfaces
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