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Autofluorescence

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https://www.readbyqxmd.com/read/27913288/autofluorescence-lifetime-variation-in-the-cuticle-of-the-bedbug-cimex-lectularius
#1
Klaus Reinhardt, Hans Georg Breunig, Karsten König
The decay time of the fluorescence of excited molecules, called fluorescence lifetime, can provide information about the cuticle composition additionally to widely used spectral characteristics. We compared autofluorescence lifetimes of different cuticle regions in the copulatory organ of females of the bedbug, Cimex lectularius. After two-photon excitation at 720 nm, regions recently characterised as being rich in resilin showed a longer bimodal distribution of the mean autofluorescence lifetime τm (tau-m) at 0...
November 29, 2016: Arthropod Structure & Development
https://www.readbyqxmd.com/read/27911841/high-performance-multiplexed-fluorescence-in-situ-hybridization-in-culture-and-tissue-with-matrix-imprinting-and-clearing
#2
Jeffrey R Moffitt, Junjie Hao, Dhananjay Bambah-Mukku, Tian Lu, Catherine Dulac, Xiaowei Zhuang
Highly multiplexed single-molecule FISH has emerged as a promising approach to spatially resolved single-cell transcriptomics because of its ability to directly image and profile numerous RNA species in their native cellular context. However, background-from off-target binding of FISH probes and cellular autofluorescence-can become limiting in a number of important applications, such as increasing the degree of multiplexing, imaging shorter RNAs, and imaging tissue samples. Here, we developed a sample clearing approach for FISH measurements...
November 22, 2016: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/27911422/-diagnostic-potential-of-optical-coherence-tomography-for-small-choroidal-melanomas
#3
A F Brovkina, A S Stoyukhina, I V Musatkina
AIM: To investigate the sequence of OCT manifestations in choroidal melanoma (CM) with account to its growth. MATERIAL AND METHODS: A total of 28 CM patients were examined. Of them, 18 patients with early CM, 10 - with medium-sized CM. The mean patient age at diagnosis was 60.54±5.31 years. Tumor location was macular (15 eyes) or perimacular (13 eyes), its prominence varied from 0.98 to 4.9 mm and basal diameter - from 5.08 to 18.9 mm. Additionally to OCT, tumor autofluorescence was studied in all cases...
2016: Vestnik Oftalmologii
https://www.readbyqxmd.com/read/27907091/real-time-fluorescence-measurements-of-ros-and-ca2-in-ischemic-reperfused-rat-hearts-detectable-increases-occur-only-after-mitochondrial-pore-opening-and-are-attenuated-by-ischemic-preconditioning
#4
Tatyana Andrienko, Philippe Pasdois, Andreas Rossbach, Andrew P Halestrap
Mitochondrial permeability transition pore (mPTP) opening is critical for ischemia / reperfusion (I/R) injury and is associated with increased [Ca2+] and reactive oxygen species (ROS). Here we employ surface fluorescence to establish the temporal sequence of these events in beating perfused hearts subject to global I/R. A bespoke fluorimeter was used to synchronously monitor surface fluorescence and reflectance of Langendorff-perfused rat hearts at multiple wavelengths, with simultaneous measurements of hemodynamic function...
2016: PloS One
https://www.readbyqxmd.com/read/27906877/association-between-small-fiber-neuropathy-and-higher-skin-accumulation-of-advanced-glycation-end-products-in-patients-with-type-1-diabetes
#5
Aleksandra Araszkiewicz, Agnieszka Gandecka, Michał Nowicki, Aleksandra Uruska, Agnieszka Malińska, Katarzyna Kowalska, Bogna Wierusz-Wysocka, Dorota Zozulińska-Ziółkiewicz
INTRODUCTION Advanced glycation end products (AGEs) play a crucial role in the pathogenesis of diabetic peripheral neuropathy (DPN). OBJECTIVES The aim of the study was to assess the skin accumulation of AGEs in patients with long‑lasting type 1 diabetes in relation to the presence of DPN. PATIENTS AND METHODS We evaluated 178 patients with type 1 diabetes (99 men; age, 43 years [interquartile range [IQR], 34-54 years]; disease duration, 25 years [IQR, 18-31 years]). DPN was diagnosed if 2 or more of the following 5 abnormalities were present: symptoms of neuropathy, lack of ankle reflexes, and impaired sensation of touch, temperature, and/or vibration...
November 22, 2016: Polskie Archiwum Medycyny Wewnętrznej
https://www.readbyqxmd.com/read/27905330/screening-for-chloroquine-maculopathy-in-populations-with-uncertain-reliability-in-outcomes-of-automatic-visual-field-testing
#6
Paradee Kunavisarut, Pimploy Chavengsaksongkram, Aniki Rothova, Kessara Pathanapitoon
PURPOSE: The purpose of this study was to compare screening methods for the early detection of maculopathy in patients treated with chloroquine (CQ) or hydroxychloroquine (HCQ) and to identify the risk factors for the development of toxic maculopathy. METHODS: We performed a prospective study of all 217 patients taking CQ and/or HCQ and seen in our center between July 2011 and December 2013. All subjects underwent a complete ocular examination, as well as spectral domain optical coherence tomography (SD-OCT), fundus autofluorescence (FAF), and 10-2 Humphrey visual field (10-2 HVF)...
October 2016: Indian Journal of Ophthalmology
https://www.readbyqxmd.com/read/27903493/cancer-detection-in-human-tissue-samples-using-a-fiber-tip-ph-probe
#7
Erik P Schartner, Matthew R Henderson, Malcolm Purdey, Deepak Dhatrak, Tanya M Monro, P Grantley Gill, David F Callen
Intraoperative detection of tumorous tissue is an important unresolved issue for cancer surgery. Difficulty in differentiating between tissue types commonly results in the requirement for additional surgeries to excise unremoved cancer tissue or alternatively in the removal of excess amounts of healthy tissue. Although pathologic methods exist to determine tissue type during surgery, these methods can compromise postoperative pathology, have a lag of minutes to hours before the surgeon receives the results of the tissue analysis, and are restricted to excised tissue...
December 1, 2016: Cancer Research
https://www.readbyqxmd.com/read/27902539/cystoid-macular-edema-and-cystoid-macular-degeneration-as-a-result-of-multiple-pathogenic-factors-in-the-setting-of-central-serous-chorioretinopathy
#8
Polina Astroz, Chandrakumar Balaratnasingam, Lawrence A Yannuzzi
PURPOSE: To report the pathogenic factors that account for cystoid macular edema and cystoid macular degeneration in chronic central serous chorioretinopathy (CSC). METHODS: The clinical course and multimodal imaging findings, including fundus color photography, fundus autofluorescence, spectral-domain optical coherence tomography, and fluorescein angiography, of one eye with cystoid macular edema due to chronic CSC was documented. RESULTS: A 44-year old woman with a history of chronic CSC presented with progressive visual decline in the right eye...
November 29, 2016: Retinal Cases & Brief Reports
https://www.readbyqxmd.com/read/27902306/description-of-gloeomargarita-lithophora-gen-nov-sp-nov-a-thylakoid-bearing-basal-branching-cyanobacterium-with-intracellular-carbonates-and-proposal-for-gloeomargaritales-ord-nov
#9
David Moreira, Rosaluz Tavera, Karim Benzerara, Fériel Skouri-Panet, Estelle Couradeau, Emmanuelle Gérard, Céline Loussert Fonta, Eberto Novelo, Yvan Zivanovic, Purificación López-García
A unicellular cyanobacterium, strain Alchichica-D10, was isolated from microbialites of the alkaline Lake Alchichica, Mexico. The cells were short rods (3.9 ± 0.6 μm in length and 1.1 ± 0.1 μm in width) forming biofilms of intense emerald green color. They exhibited red autofluorescence under UV light excitation. UV-visible absorption spectra revealed that they contain chlorophyll a and phycocyanin, and electron microscopy showed the presence of thylakoids. The strain grew within a temperature range of 15-30 °C...
November 21, 2016: International Journal of Systematic and Evolutionary Microbiology
https://www.readbyqxmd.com/read/27895656/meselect-a-rapid-and-effective-method-for-the-separation-of-the-main-leaf-tissue-types
#10
Julia Svozil, Wilhelm Gruissem, Katja Baerenfaller
Individual tissues of complex eukaryotic organisms have specific gene expression programs that control their functions. Therefore, tissue-specific molecular information is required to increase our understanding of tissue-specific processes. Established methods in plants to obtain specific tissues or cell types from their organ or tissue context typically require the enzymatic degradation of cell walls followed by fluorescence-activated cell sorting (FACS) using plants engineered for localized expression of green fluorescent protein...
2016: Frontiers in Plant Science
https://www.readbyqxmd.com/read/27894750/risk-factors-for-autonomic-and-somatic-nerve-dysfunction-in-different-stages-of-glucose-tolerance
#11
Rumyana Dimova, Tsvetalina Tankova, Velina Guergueltcheva, Ivailo Tournev, Nevena Chakarova, Greta Grozeva, Lilia Dakovska
AIM: The present study evaluates autonomic and somatic nerve function in different stages of glucose tolerance and its correlation with different cardio-metabolic parameters. MATERIAL AND METHODS: Four hundred seventy-eight subjects, mean age 49.3±13.7years and mean BMI 31.0±6.2kg/m2, divided according to glucose tolerance: 130 with normal glucose tolerance (NGT), 227 with prediabetes (125 with impaired fasting glucose (IFG) and 102 with isolated impaired glucose tolerance (iIGT)), and 121 with newly-diagnosed T2D (NDT2D), were enrolled...
November 6, 2016: Journal of Diabetes and its Complications
https://www.readbyqxmd.com/read/27893108/choroidal-thickness-influences-near-infrared-reflectance-intensity-in-eyes-with-geographic-atrophy-due-to-age-related-macular-degeneration
#12
Rosa Dolz-Marco, Orly Gal-Or, K Bailey Freund
Purpose: To evaluate the effects of retinal and choroidal thickness on near-infrared reflectance (NIR) scanning laser ophthalmoscopy in eyes with geographic atrophy (GA) secondary to non-neovascular age-related macular degeneration (AMD). Methods: This was a cross-sectional review of the clinical records and multimodal imaging data of eyes diagnosed with GA secondary to non-neovascular AMD. Imaging modalities included color fundus photography, fundus autofluorescence, NIR, and structural spectral-domain optical coherence tomography (SD-OCT)...
November 1, 2016: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/27889502/role-of-lamellar-hole-associated-epiretinal-proliferation-in-lamellar-macular-holes
#13
Roberto dell'Omo, Gianni Virgili, Stanislao Rizzo, Serena De Turris, Giovanni Coclite, Dario Giorgio, Ermanno dell'Omo, Ciro Costagliola
PURPOSE: To compare the morphologic and functional characteristics and response to surgery of lamellar macular holes (LMHs) with and without lamellar hole-associated epiretinal proliferation (LHEP) and standard epiretinal membrane (ERM). DESIGN: Retrospective observational case series. METHODS: Setting: Vitreoretinal clinical practice. STUDY POPULATION: Eigthy-four eyes of 84 patients. The included eyes must present an irregular foveal contour and schitic or cavitated lamellar separation of neurosensory retina on spectral-domain optical coherence tomography (SD-OCT) and an area of increased autofluorescence on blue- fundus autofluorescence (B-FAF)...
November 23, 2016: American Journal of Ophthalmology
https://www.readbyqxmd.com/read/27886184/a-view-of-the-current-and-future-role-of-optical-coherence-tomography-in-the-management-of-age-related-macular-degeneration
#14
REVIEW
U Schmidt-Erfurth, S Klimscha, S M Waldstein, H Bogunović
Optical coherence tomography (OCT) has become an established diagnostic technology in the clinical management of age-related macular degeneration (AMD). OCT is being used for primary diagnosis, evaluation of therapeutic efficacy, and long-term monitoring. Computer-based advances in image analysis provide complementary imaging tools such as OCT angiography, further novel automated analysis methods as well as feature detection and prediction of prognosis in disease and therapy by machine learning. In early AMD, pathognomonic features such as drusen, pseudodrusen, and abnormalities of the retinal pigment epithelium (RPE) can be imaged in a qualitative and quantitative way to identify early signs of disease activity and define the risk of progression...
November 25, 2016: Eye
https://www.readbyqxmd.com/read/27886089/representation-method-for-spectrally-overlapping-signals-in-flow-cytometry-based-on-fluorescence-pulse-time-delay-estimation
#15
Wenchang Zhang, Xiaoping Lou, Xiaochen Meng, Lianqing Zhu
Flow cytometry is being applied more extensively because of the outstanding advantages of multicolor fluorescence analysis. However, the intensity measurement is susceptible to the nonlinearity of the detection method. Moreover, in multicolor analysis, it is impossible to discriminate between fluorophores that spectrally overlap; this influences the accuracy of the fluorescence pulse signal representation. Here, we focus on spectral overlap in two-color analysis, and assume that the fluorescence follows the single exponential decay model...
November 23, 2016: Sensors
https://www.readbyqxmd.com/read/27885710/clinical-imaging-of-macular-pigment-optical-density-and-spatial-distribution
#16
REVIEW
Christopher M Putnam
Clinical research continues to provide an increasing number of studies that reveal an association between macular pigment optical density (MPOD) and both visual function and ocular health. As a result, there is a growing need for repeatable, accurate measures of MPOD that can describe peak optical density as well as spatial distribution. Measurement of MPOD in a research setting has an established history encompassing a number of both objective and subjective techniques. Transition of these techniques to a clinical setting has produced an array of commercial devices using three primary methods: heterochromatic flicker photometry, fundus autofluorescence and fundus reflectometry...
November 24, 2016: Clinical & Experimental Optometry: Journal of the Australian Optometrical Association
https://www.readbyqxmd.com/read/27883134/non-fluorescent-quantification-of-single-mrna-with-transient-absorption-microscopy
#17
Jing Liu, Joseph M K Irudayaraj
Single molecule detection is confounded by the background signals from the biological environment, such as autofluorescence, Rayleigh scattering, or turbidity in cells and tissues. In this article, we report on the utilization of gold nanoparticles (AuNPs) as an orthogonal probe for non-fluorescence detection of single molecules with a transient absorption microscopy (TAM). The developed system and concepts were validated by quantitative evaluation of human epidermal receptor 2 (Her2) mRNA in cancer cells and tissues at single copy sensitivity...
November 24, 2016: Nanoscale
https://www.readbyqxmd.com/read/27880741/optical-coherence-tomography-angiography-of-chorioretinal-lesions-due-to-idiopathic-multifocal-choroiditis
#18
Sarwar Zahid, Kevin C Chen, Jesse J Jung, Chandrakumar Balaratnasingam, Quraish Ghadiali, John Sorenson, Soraya Rofagha, K Bailey Freund, Lawrence A Yannuzzi
PURPOSE: To evaluate the spectrum of macular chorioretinal lesions occurring in idiopathic multifocal choroiditis using optical coherence tomography angiography (OCTA) to evaluate those showing neovascular flow. METHODS: This was a descriptive, retrospective study of 18 eyes of 14 patients with multifocal choroiditis. Macular lesions were characterized as subretinal pigment epithelium, subretinal, or mixed and evaluated during active and presumed inactive states of multifocal choroiditis...
October 31, 2016: Retina
https://www.readbyqxmd.com/read/27880076/correlation-of-ultra-widefield-fundus-autofluorescence-patterns-with-the-underlying-genotype-in-retinal-dystrophies-and-retinitis-pigmentosa
#19
George Trichonas, Elias I Traboulsi, Justis P Ehlers
PURPOSE: Ultra-widefield fundus autofluorescence (UW-FAF) allows the characterization of the peripheral retinal features of vitreoretinal diseases. The purpose of this study was to examine possible genotypic/phenotypic correlations of UW-FAF patterns in patients with a variety of retinal dystrophies and retinitis pigmentosa (RP). METHODS: An IRB-approved retrospective consecutive case series study was performed of genetically characterized retinal dystrophy or RP patients who underwent UW-FAF imaging...
November 23, 2016: Ophthalmic Genetics
https://www.readbyqxmd.com/read/27879398/spectral-unmixing-plate-reader-high-throughput-high-precision-fret-assays-in-living-cells
#20
Tory M Schaaf, Kurt C Peterson, Benjamin D Grant, David D Thomas, Gregory D Gillispie
We have developed a microplate reader that records a complete high-quality fluorescence emission spectrum on a well-by-well basis under true high-throughput screening (HTS) conditions. The read time for an entire 384-well plate is less than 3 min. This instrument is particularly well suited for assays based on fluorescence resonance energy transfer (FRET). Intramolecular protein biosensors with genetically encoded green fluorescent protein (GFP) donor and red fluorescent protein (RFP) acceptor tags at positions sensitive to structural changes were stably expressed and studied in living HEK cells...
November 22, 2016: Journal of Biomolecular Screening
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