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https://www.readbyqxmd.com/read/28738581/the-g-bhq-synergistic-effect-improved-double-quenching-molecular-beacons-based-on-guanine-and-black-hole-quencher-for-sensitive-simultaneous-detection-of-two-dnas
#1
Dongshan Xiang, Fengquan Li, Chenyi Wu, Boan Shi, Kun Zhai
We designed two double quenching molecular beacons (MBs) with simple structure based on guanine (G base) and Black Hole Quencher (BHQ), and developed a new analytical method for sensitive simultaneous detection of two DNAs by synchronous fluorescence analysis. In this analytical method, carboxyl fluorescein (FAM) and tetramethyl-6-carboxyrhodamine (TAMRA) were respectively selected as fluorophore of two MBs, Black Hole Quencher 1 (BHQ-1) and Black Hole Quencher 2 (BHQ-2) were respectively selected as organic quencher, and three continuous nucleotides with G base were connected to organic quencher (BHQ-1 and BHQ-2)...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738415/monocarboxylate-transporters-mediate-fluorescein-uptake-in-corneal-epithelial-cells
#2
Yi-Chen Sun, Hau-Min Liou, Po-Ting Yeh, Wei-Li Chen, Fung-Rong Hu
Purpose: To determine the presence of monocarboxylate transporter (MCT) in human and rabbit corneal epithelium and its role in transcellular fluorescein transportation in the cornea. Methods: The presence of MCTs in human and rabbit corneal epithelium was determined by RT-PCR and immunohistochemistry. Intracellular fluorescein uptake experiment was performed using cultured human corneal epithelial cells (HCECs). The involvement of MCT in fluorescein uptake was determined by addition of MCT inhibitors to HCECs and acute dry eye model on New Zealand albino rabbits by spectrophotometry, corneal impression cytology, and external eye photographs...
July 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28738269/an-anti-inflammatory-effect-of-red-microalga-polysaccharides-in-coronary-artery-endothelial-cells
#3
Oshrat Levy-Ontman, Mahmoud Huleihel, Rachel Hamias, Talya Wolak, Esther Paran
BACKGROUND AND AIMS: Polysaccharides (PSs) produced by the red microalga Porphyridium sp. were reported to exhibit anti-inflammatory bioactivities in the human skin. The primary goal of the present research was to assess whether PSs attenuate inflammatory processes by interfering with tumour necrosis factor-alpha (TNF-α)-induced inflammation, in human coronary artery endothelial cells (HCAECs). METHODS: Functional and inflammatory markers were quantified in TNF-α-stimulated HCAECs, with and without pre-treatment with PSs...
July 16, 2017: Atherosclerosis
https://www.readbyqxmd.com/read/28738134/indocyanine-green-angiography-and-optical-coherence-tomography-angiography-of-choroidal-neovascularization-in-age-related-macular-degeneration
#4
Chiara M Eandi, Antonio Ciardella, Mariacristina Parravano, Filippo Missiroli, Camilla Alovisi, Chiara Veronese, Maria C Morara, Massimo Grossi, Gianni Virgili, Federico Ricci
Purpose: To compare the capability of indocyanine green angiography (ICGA) and optical coherence tomography angiography (OCTA) in detecting choroidal neovascularization (CNV). Methods: In this prospective study, patients with CNV detected with fluorescein angiography (FA) underwent ICGA and OCTA, spectral domain OCT (SD-OCT), and infrared or fundus color photographs. CNV lesions were outlined on ICGA and OCTA images, and the composition and size of the CNV was documented...
July 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28737601/new-ways-to-detect-pediatric-sickle-cell-retinopathy-a-comprehensive-review
#5
Daniel A Pahl, Nancy S Green, Monica Bhatia, Royce W S Chen
Sickle retinopathy reflects disease-related vascular injury of the eye, which can potentially result in visual loss from vitreous hemorrhage or retinal detachment. Here we review sickle retinopathy among children with sickle cell disease, describe the epidemiology, pediatric risk factors, pathophysiology, ocular findings, and treatment. Newer, more sensitive ophthalmological imaging modalities are available for retinal imaging, including ultra-widefield fluorescein angiography, spectral-domain optical coherence tomography, and optical coherence tomography angiography...
July 21, 2017: Journal of Pediatric Hematology/oncology
https://www.readbyqxmd.com/read/28736995/controlled-exposure-of-bioactive-growth-factor-in-3d-amyloid-hydrogel-for-stem-cells-differentiation
#6
Subhadeep Das, Rakesh Kumar, Narendra Nath Jha, Samir K Maji
Amyloid based hydrogels can mimic the extracellular matrix and serve as matrices for tissue engineering both in vitro and in vivo. A pH responsive self-assembled amyloid hydrogel system is used to encapsulate various growth factors for driving stem cell differentiation toward neuronal lineage. Diffusion studies with fluorescence recovery after photobleaching and bulk release with the model protein fluorescein isothiocyanate-bovine serum albumin show that encapsulated protein molecules can be released in a sustained fashion from the hydrogel over a considerable period of time (30 d)...
July 24, 2017: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/28736674/fluorescein-as-a-topical-fluorescent-contrast-agent-for-quantitative-microendoscopic-inspection-of-colorectal-epithelium
#7
Sandra P Prieto, Keith K Lai, Jonathan A Laryea, Jason S Mizell, William C Mustain, Timothy J Muldoon
Fiber bundle microendoscopic imaging of colorectal tissue has shown promising results, for both qualitative and quantitative analysis. A quantitative image quality control and image feature extraction algorithm was previously designed for quantitative image feature analysis of proflavine-stained ex vivo colorectal tissue. We investigated fluorescein as an alternative topical stain. Images of ex vivo porcine, caprine, and human colorectal tissue were used to compare microendoscopic images of tissue topically stained with fluorescein and proflavine solutions...
April 1, 2017: Biomedical Optics Express
https://www.readbyqxmd.com/read/28736342/tfos-dews-ii-diagnostic-methodology-report
#8
REVIEW
James S Wolffsohn, Reiko Arita, Robin Chalmers, Ali Djalilian, Murat Dogru, Kathy Dumbleton, Preeya Gupta, Paul Karpecki, Sihem Lazreg, Heiko Pult, Benjamin D Sullivan, Alan Tomlinson, Louis Tong, Edoardo Villani, Kyung Chul Yoon, Lyndon Jones, Jennifer Craig
The role of the Tear Film and Ocular Surface Society (TFOS) Dry Eye Workshop (DEWS) II Diagnostic Methodology Subcommittee was 1) to identify tests used to diagnose and monitor dry eye disease (DED), 2) to identify those most appropriate to fulfil the definition of DED and its sub-classifications, 3) to propose the most appropriate order and technique to conduct these tests in a clinical setting, and 4) to provide a differential diagnosis for DED and distinguish conditions where it is a comorbidity. Symptom screening with the DEQ-5 or OSDI confirms that a patient might have DED and triggers the diagnostic tests of (ideally non-invasive) breakup time, osmolarity and ocular surface staining with fluorescein and lissamine green (observing the cornea, conjunctiva and eyelid margin)...
May 4, 2017: Ocular Surface
https://www.readbyqxmd.com/read/28735538/photophysics-of-the-singlet-oxygen-sensor-green-chromophore-self-production-of-1-o2-explained-by-molecular-modelling
#9
Marco Marazzi, Vanessa Besancenot, Hugo Gattuso, Henri-Pierre Lassalle, Stephanie Grandemange, Antonio Monari
We report a combined computational and experimental study in order to rationalize the behavior of a well known singlet oxygen (1O2) probe, i.e. the chromophore of the Singlet Oxygen Sensor Green: a fluoresceine-based sensor. In particular we evidence that the presence of an intramoleculer charge transfer state that is no more present upon reaction with 1O2 explains the fluorescence enhancement observed in presence of reactive oxygen species. Furthermore we also unequivocally show the photophysical pathways leading to fluorescence enhancement of fluoresceine upon irradiation with UVA lights and also in the absence of any oxygen activator...
July 24, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28735041/self-assembled-polypeptide-nanoparticles-for-intracellular-irinotecan-delivery
#10
N N Zashikhina, M V Volokitina, V A Korzhikov-Vlakh, I I Tarasenko, A Lavrentieva, T Scheper, E Rhuel, R V Orlova, T B Tennikova, E G Korzhikova-Vlakh
In this research poly(l-lysine)-b-poly(l-leucine) (PLys-b-PLeu) polymersomes were developed. It was shown that the size of nanoparticles depended on pH of self-assembly process and varied from 180 to 650nm. The biodegradation of PLys-b-PLeu nanoparticles was evaluated using in vitro polypeptide hydrolysis in two model enzymatic systems, as well as in human blood plasma. The experiments of the visualization of cellular uptake of rhodamine 6g-loaded and fluorescein-labeled nanoparticles were carried out, which approved the possibility of their penetration into the cells...
July 19, 2017: European Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28734811/treatment-na%C3%A3-ve-quiescent-choroidal-neovascularization-in-geographic-atrophy-secondary-to-non-exudative-age-related-macular-degeneration
#11
Vittorio Capuano, Alexandra Miere, Lea Querques, Riccardo Sacconi, Adriano Carnevali, Francesca Amoroso, Francesco Bandello, Eric H Souied, Giuseppe Querques
PURPOSE: To describe the characteristics and natural history of quiescent choroidal neovascularization (CNV) in geographic atrophy (GA) secondary to non-exudative age-related macular degeneration (AMD) through multimodal imaging. DESIGN: Retrospective observational case series. METHODS: Patients diagnosed with quiescent CNV were analyzed in two high-volume referral centers. Imaging features obtained using fluorescein angiography (FA), indocyanine green angiography (ICGA), structural optical-coherence-tomography (OCT), and OCT-Angiography (OCT-A) were noted at first presentation and during the study period...
July 19, 2017: American Journal of Ophthalmology
https://www.readbyqxmd.com/read/28733573/inadvertent-introduction-of-tissue-coring-into-joints-during-arthrocentesis-an-experimental-study
#12
Chi Xu, Haiwen Peng, Wei Chai, Xiang Li, Rui Li, Jiying Chen
BACKGROUND The aim of this study was to investigate whether needles introduce skin plugs into joints during arthrocentesis. MATERIAL AND METHODS In the first part of this study, the arthrocentesis site was scrubbed with a fluorescein sodium swab, and 90 needles were inserted through the joint tissue and collected for examination under a fluorescence microscope. In the second part of this study, the joints were injected using 720 needles of different gauges. Two different randomly assigned needle insertion techniques were used: needle insertion straight through the joint capsule (subgroup 1) or insertion of the needle into the subcutaneous tissue followed by flushing of the needle with 0...
July 22, 2017: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/28732924/ultrasonic-irradiation-enhanced-the-ability-of-fluorescein-da-fe-iii-on-sonodynamic-and-sonocatalytic-damages-of-dna-molecules
#13
Qiong Wu, Xia Chen, Lizhen Jia, Yi Wang, Ying Sun, Xingjun Huang, Yuxiang Shen, Jun Wang
The interaction of DNA with Bis [N,N-bis (carboxymethyl) aminomethyl] fluorescein-Ferrous(III) (Fluorescein-DA-Fe(III)) with dual functional (sonodynamic and sonocatalytic) activity was studied by UV-vis spectroscopy, fluorescence spectroscopy, FT-IR spectroscopy, circular dichroism (CD) spectroscopy and viscosity measurements. And then, the damage of DNA caused by Fluorescein-DA-Fe(III) under ultrasonic irradiation (US) was researched by agarose gel electrophoresis and cytotoxicity assay. Meanwhile, some influenced factors such as ultrasonic irradiation time and Fluorescein-DA-Fe(III) concentration on the damage degree of DNA molecules were also examined...
November 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28732589/accuracy-of-diagnostic-imaging-modalities-for-classifying-pediatric-eyes-as-papilledema-versus-pseudopapilledema
#14
Melinda Y Chang, Federico G Velez, Joseph L Demer, Laura Bonelli, Peter A Quiros, Anthony C Arnold, Alfredo A Sadun, Stacy L Pineles
PURPOSE: To identify the most accurate diagnostic imaging modality for classifying pediatric eyes as papilledema (PE) or pseudopapilledema (PPE). DESIGN: Prospective observational study. SUBJECTS: Nineteen children between the ages of 5 and 18 years were recruited. Five children (10 eyes) with PE, 11 children (19 eyes) with PPE owing to suspected buried optic disc drusen (ODD), and 3 children (6 eyes) with PPE owing to superficial ODD were included...
July 18, 2017: Ophthalmology
https://www.readbyqxmd.com/read/28732069/saccharomyces-boulardii-cncm-i-745-supplementation-reduces-gastrointestinal-dysfunction-in-an-animal-model-of-ibs
#15
Paola Brun, Melania Scarpa, Chiara Marchiori, Gloria Sarasin, Valentina Caputi, Andrea Porzionato, Maria Cecilia Giron, Giorgio Palù, Ignazio Castagliuolo
BACKGROUND: We evaluated the effect of Saccharomyces boulardii CNCM I-745 on intestinal neuromuscular anomalies in an IBS-type mouse model of gastrointestinal motor dysfunctions elicited by Herpes Simplex Virus type 1 (HSV-1) exposure. METHODS: Mice were inoculated intranasally with HSV-1 (102 PFU) or vehicle at time 0 and 4 weeks later by the intragastric (IG) route (108 PFU). Six weeks after IG inoculum, mice were randomly allocated to receive oral gavage with either S...
2017: PloS One
https://www.readbyqxmd.com/read/28731055/choroidal-excavation-in-choroidal-osteoma-complicated-by-choroidal-neovascularization
#16
L Pierro, A Marchese, M Gagliardi, U Introini, M Battaglia Parodi, G Casalino, F Bandello
PurposeTo describe multimodal imaging features of choroidal osteoma (CO) complicated by choroidal neovascularization (CNV) and focal choroidal excavation (FCE).MethodsPatients presenting with CO and CNV between January and October 2016 were considered for this study. Diagnosis of CO was confirmed by ultrasound examination. All patients underwent multimodal imaging including optical coherence tomography (OCT), swept-source OCT angiography (DRI OCT Triton, Topcon, Inc., Tokyo, Japan) and fluorescein angiography (Spectralis HRA+OCT; Heidelberg Engineering, Heidelberg, Germany)...
July 21, 2017: Eye
https://www.readbyqxmd.com/read/28730399/optical-coherence-tomography-angiography-findings-in-susac-s-syndrome-a-case-report
#17
Rodolfo Mastropasqua, Lisa Toto, Alfonso Senatore, Alessandro D'Uffizi, Piergiorgio Neri, Cesare Mariotti, Marica Tina Maccarone, Luca Di Antonio
PURPOSE: To report clinical features of Susac's syndrome (SS) using optical coherence tomography angiography (OCTA). METHODS: Case report. RESULTS: A 25-year-old Caucasian female with a history of non-pulsatile migraine, tinnitus, and verbal apraxia complaining of peripheral scotoma in left eye due to branch retinal arteriole occlusion (BRAO) was diagnosed as having SS after audiometric test, brain magnetic resonance imaging, and multimodal retinal imaging...
July 20, 2017: International Ophthalmology
https://www.readbyqxmd.com/read/28730105/pigment-epithelium-derived-factor-protects-retinal-ganglion-cells-from-hypoxia-induced-apoptosis-by-preventing-mitochondrial-dysfunction
#18
Shu-Wei Tian, Yuan Ren, Jin-Zhi Pei, Bai-Chao Ren, Yuan He
AIM: To investigate the potential of pigment epithelium-derived factor (PEDF) to protect the immortalized rat retinal ganglion cells-5 (RGC-5) exposed to CoCl2-induced chemical hypoxia. METHODS: After being differentiated with staurosporine (SS), RGC-5 cells were cultured in four conditions: control group cells cultured in Dulbecco's modified eagle medium (DMEM) supplemented with 10% fetal bovine serum, 100 µmol/mL streptomycin and penicillin (named as normal conditions); hypoxia group cells cultured in DMEM containing 300 µmol/mL CoCl2; cells in the group protected by PEDF were first pretreated with 100 ng/mL PEDF for 2h and then cultured in the same condition as hypoxia group cells; and PEDF group cells that were cultured in the presence of 100 ng/mL PEDF under normal conditions...
2017: International Journal of Ophthalmology
https://www.readbyqxmd.com/read/28730085/ocular-surface-evaluation-in-eyes-with-chronic-glaucoma-on-long-term-topical-antiglaucoma-therapy
#19
Manu Saini, Murugesan Vanathi, Tanuj Dada, Tushar Agarwal, Rebika Dhiman, Sudarshan Khokhar
AIM: To evaluate ocular surface changes and its correlation with the central corneal subbasal nerve fibre layer in chronic glaucoma patients. METHODS: A prospective comparative study of ocular surface evaluation was performed in 50 eyes of 25 patients using two or more antiglaucoma medications for at least 6mo and 50 eyes of 25 normal subjects without any ocular problems as controls. The study parameters evaluated included visual acuity, intraocular pressure, ocular surface evaluation parameters [fluorescein break-up time (FTBUT), Schirmer's I test, ocular surface staining scores and ocular surface disease index score (OSDI)], central corneal sensation (Cochet Bonnett aesthesiometer), central subbasal nerve fiber layer density (SBNFLD) by confocal microscopy...
2017: International Journal of Ophthalmology
https://www.readbyqxmd.com/read/28729014/evaluating-ureteral-patency-in-the-post-indigo-carmine-era-a-randomized-controlled-trial
#20
Cara Grimes, Sonali Patankar, Timothy Ryntz, Nisha Philip, Khara Simpson, Mireille Truong, Connie Young, Arnold Advincula, Obianuju S Madueke-Laveaux, Ryan Walters, Cande V Ananth, Jin Hee Kim
BACKGROUND: Many gynecologic, urologic and pelvic reconstructive surgeries require accurate intra-operative evaluation of ureteral patency. OBJECTIVE: We performed a randomized controlled trial to compare surgeon satisfaction with four methods of evaluating ureteral patency during cystoscopy at the time of benign gynecologic or pelvic reconstructive surgery: oral phenazopyridine, intravenous sodium fluorescein, mannitol bladder distention and normal saline bladder distention...
July 17, 2017: American Journal of Obstetrics and Gynecology
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