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https://www.readbyqxmd.com/read/28636149/photocatalytic-interaction-of-aminophylline-riboflavin-leads-to-ros-mediated-dna-damage-and-cell-death-a-novel-phototherapeutic-mechanism-for-cancer
#1
Saniyya Khan, Imrana Naseem
The accompanied tissue devastation and systemic toxicity of chemotherapy has shifted the quest for having an effective and palliative cancer therapy towards photodynamic therapy (PDT). Riboflavin (Rf), an essential micronutrient is emerging as a potent tool of PDT, due to its excellent photosensitizing properties. It can be used as an efficient adjuvant for various anticancer drugs. The hemolytic and proteolytic effect of photoilluminated aminophylline (Am), a xanthine derivative, and Rf is well documented in literature...
June 21, 2017: IUBMB Life
https://www.readbyqxmd.com/read/28635273/a-direct-bandgap-copper-antimony-halide-perovskite
#2
Brenda Vargas, Estrella Ramos, Enrique Pérez-Gutiérrez, Juan C Alonso, Diego Solis-Ibarra
Since the establishment of perovskite solar cells (PSCs) there has been an intense search for alternative materials to replace lead and improve their stability towards moisture and light. As single-metal perovskite structures have yielded unsatisfactory performances, an alternative is the use of double perovskites that incorporate a combination of metals. To this day, only a handful of these compounds have been synthesized, but most of them have indirect bandgaps and/or do not have bandgaps energies well-suited for photovoltaic applications...
June 21, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28635250/a-highly-stimuli-responsive-au-nanorods-poly-n-isopropylacrylamide-pnipam-composite-hydrogel-for-smart-switch
#3
Chuan-Ling Zhang, Fu-Hu Cao, Jin-Long Wang, Zhi-Long Yu, Jin Ge, Yang Lu, Zhi-Hua Wang, Shu-Hong Yu
To achieve both fast response and structural integrity during the repeating volume changes are the most significant chal-lenges for thermo-responsive hydrogels. In this work, AuNRs/PNIPAM composite hydrogel with fast thermal/optical re-sponse and structural integrity is facilely prepared by electrospinning and following a curing treatment. By combining the photothermal property of AuNRs and thermal-responsive effect of PNIPAM, the composite hydrogel shows fast thermal/photo-response, high heating rate and high structural integrity with fiercely size change...
June 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28635081/understanding-and-improving-photo-control-of-ion-channels-in-nociceptors-with-azobenzene-photoswitches
#4
Alexandre Mourot, Christian Herold, Michael A Kienzler, Richard H Kramer
BACKGROUND AND PURPOSE: We previously developed a photoisomerizable local anaesthetic, named QAQ, to gain rapid, optical control over pain signaling without involving genetic modification. In darkness or in green light, trans-QAQ blocks voltage-gated K(+) and Na(+) channels and silences action potentials in pain-sensing neurons. Upon photoisomerization to cis with near UV light, QAQ blockade is rapidly relieved and neuronal activity is restored. However, the molecular mechanism of cis and trans QAQ blockade is not known...
June 20, 2017: British Journal of Pharmacology
https://www.readbyqxmd.com/read/28634633/erratum-to-nd-yag-laser-irradiation-associated-with-fluoridated-gels-containing-photo-absorbers-in-the-prevention-of-enamel-erosion
#5
L G S Pereira, S H Joao-Souza, S J C Bezerra, A B Borges, A C C Aranha, T Scaramucci
No abstract text is available yet for this article.
June 20, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/28633828/bi25vo40-microcube-with-step-surface-for-visible-light-photocatalytic-reduction-of-cr-vi-enhanced-activity-and-ultrasound-assisted-regeneration
#6
Pei Wang, Wenda Ji, Mingmeng Li, Gaoke Zhang, Jinlong Wang
In this study, a kind of bismuth vanadium (Bi25VO40) microcube with step surface was successfully synthesized by a fast and mild hydrothermal method. The reaction time and hydrothermal temperature are the key factors which are accounted for the formation of this unique structure. The as-prepared Bi25VO40 microcube exhibited considerably higher visible light photocatalytic activity compared with the smooth one, revealing that fabrication of Bi25VO40 with step surface was an effective method to improve the photocatalytic activity...
September 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28633823/sono-synthesis-of-solar-light-responsive-s-n-c-tri-doped-tio2-photo-catalyst-under-optimized-conditions-for-degradation-and-mineralization-of-diclofenac
#7
Sara Ramandi, Mohammad H Entezari, Narjes Ghows
C-N-S-tri doped TiO2 anatase phase was synthesized using a facile, effective and novel sonochemical method at low frequency (20kHz) and at room temperature. Titanium butoxide as the titanium precursor and thiourea as the dopant source were used in the synthesis of the photo-catalyst. The effects of important parameters such as thiourea/Ti molar ratio, ultrasound intensity, sonication time and temperature were studied on the synthesis of tri-doped TiO2. The XPS results confirmed the presence of N, S, and C in the photo-catalyst...
September 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28633818/insight-into-the-synthesis-procedure-of-fe-3-tio2-based-photocatalyst-applied-in-the-selective-photo-oxidation-of-benzyl-alcohol-under-sun-imitating-lamp
#8
Agnieszka Magdziarz, Juan C Colmenares, Olga Chernyayeva, Dmytro Lisovytskiy, Justyna Grzonka, Krzysztof Kurzydłowski, Kinga Freindl, Józef Korecki
Fe(3+)/TiO2/zeolite Y photocatalyst synthesized by using sonophotodeposition method was compared with photocatalysts prepared by simple photodeposition and sonodeposition methods in order to clarify the role of light irradiation and ultrasounds while they are used simultaneously. To gain an insight into the mechanism of this method a detailed characterization of the photocatalysts was carried out by means of the following techniques: UV-vis diffuse reflectance spectroscopy, X-ray photoelectron spectroscopy, transmission electron microscopy, Mössbauer measurements and photocatalytic test reaction...
September 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28633520/ion-selective-nanosensor-for-photoacoustic-and-fluorescence-imaging-of-potassium
#9
Chang Heon Lee, Jeff Folz, Wuliang Zhang, Janggun Jo, Joel W Y Tan, Xueding Wang, Raoul Kopelman
Ion-selective optodes (ISOs), the optical analog of ion-selective electrodes, have played an increasingly important role in chemical and biochemical analysis. Here we extend this technique to ion-selective photo-acoustic optodes (ISPAOs) that serve at the same time as fluorescence-based ISOs, and apply it specifically to potassium (K+). Notably, the potassium ion is one of the most abundant cations in biological systems, involved in numerous physiological and pathological processes. Furthermore, it has been recently reported that the presence of abnormal extracellular potassium concentrations in tumors suppresses the immune responses and thus suppresses immunotherapy...
June 21, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28632764/accuracy-and-reliability-of-retinal-photo-grading-for-diabetic-retinopathy-remote-graders-from-a-developing-country-and-standard-retinal-photo-grader-in-australia
#10
Fakir M Amirul Islam
BACKGROUND: To evaluate the accuracy and reliability of fundus retinal photos graded by local graders in Bangladesh with those graded by an expert at the Centre for Eye Research Australia (CERA) in the context of mass scale diabetic retinopathy (DR) screening in Bangladesh. METHODS: A population-based cross-sectional study of 3,104 adults identified 213 (7.2%) eligible patients with diabetes of age ≥ 40 years in 2012-2013. Retinal photographs were collected using a non-mydriatic digital fundus retinal camera and a two-field imaging protocol...
2017: PloS One
https://www.readbyqxmd.com/read/28632139/peptide-functionalized-gold-nanoparticles-the-influence-of-ph-on-binding-efficiency
#11
Emma Harrison, Jeremy Hamilton, Manuel Montero, Dorian Dixon
We report herein on the synthesis of mixed monolayer gold nanoparticles (AuNPs) capped with both polyethylene glycol (PEG) and one of three peptides. Either a receptor-mediated endocytosis (RME) peptide, an endosomal escape pathway (H5WYG) peptide or the Nrp-1 targeting RGD peptide (CRGDK) labelled with FITC. All three peptides have a thiol containing cysteine residue which can be used to bind the peptides to the AuNPs. In order to investigate the influence of pH on peptide attachment, PEGylated AuNPs were centrifuged, the supernatant removed, and the nanoparticles were then re-suspended in a range of pH buffer solutions above, below and at the respective isoelectric points of the peptides before co-functionalization...
June 20, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28631867/visible-light-irradiated-graphitic-carbon-nitride-g-c3n4-photocatalyzed-cation-radical-diels-alder-reactions-with-dioxygen-as-sustainable-mediator-for-photoinduced-electrons
#12
Yubao Zhao, Markus Antonietti
Photocatalytic Diels-Alder (D-A) reaction with electron rich olefins is realized by graphitic carbon nitride (g-C3N4) under visible light irradiation and aerobic condition. This heterogeneous photo-redox reaction system is highly efficient, and apparent quantum yield reaches a remarkable value of 47 % for the model reaction. Dioxygen plays a critical role as electron mediator, which is distinct from the previous reports in the homogeneous Ru(II) complex photo-redox system. Moreover, the reaction intermediate vinylcyclobutane is captured and monitored during the reaction, serving as a direct evidence for the proposed reaction mechanism...
June 20, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28631780/tuning-the-photocatalytic-activity-of-bismuth-wolframate-towards-selective-oxidations-for-the-biorefinery-driven-by-solar-light
#13
Rosaria Ciriminna, Riccardo Delisi, Francesco Parrino, Leonardo Palmisano, Mario Pagliaro
The sol-gel entrapment of nanostructured Bi2WO6 enhances the activity and the selectivity of the short-gap semiconductor in the sunlight-driven photo-oxidation of trans-ferulic and trans-cinnamic acid dissolved in water with air as the primary oxidant. Valuable products such as vanillin, benzaldehyde, benzoic acid and vanillic acid are obtained. This provides the proof of concept that photocatalysis could be a promising technology in tomorrow's solar biorefineries.
June 20, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28631477/influence-of-the-electrostatic-interaction-between-molecular-catalyst-and-semiconductor-on-photocatalytic-hydrogen-evolution-activities-in-cobaloxime-cds-hybrid-systems
#14
Yuxing Xu, Ruotian Chen, Zhen Li, Ai-Long Li, Hongxian Han, Can Li
The influence of the electrostatic interaction on photocatalytic H2 evolution activities in cobaloxime/CdS hybrid systems was studied by measuring the charges of cobaloximes and zeta potentials of CdS at different pH conditions (pH 4~7). The cobaloxime/CdS hybrid systems may serve as a valid model for the investigation of the electrostatic interaction between molecular and semiconductor, because the kinetics of methanol oxidation and the driving force of electron transfer from photo-irradiated CdS to cobaloximes have little effect on the pH dependent photocatalytic H2 evolution activities...
June 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28629892/engineered-myocardium-model-to-study-the-roles-of-hif-1%C3%AE-and-hif1a-as1-in-paracrine-only-signaling-under-pathological-level-oxidative-stress
#15
Aylin Acun, Pinar Zorlutuna
Studying heart tissue is critical for understanding and developing treatments for cardiovascular diseases. In this work, we fabricated precisely controlled and biomimetic engineered model tissues to study how cell-cell and cell-matrix interactions influence myocardial cell survival upon exposure to pathological level oxidative stress. Specifically, the interactions of endothelial cells (ECs) and cardiomyocytes (CMs), and the role of hypoxia inducible factor-1α (HIF-1α), with its novel alternative regulator, HIF-1α antisense RNA1 (HIF1A-AS1), in these interactions were investigated...
June 16, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28629058/photo-induced-surface-grafting-of-phosphorylcholine-containing-copolymers-onto-mesoporous-silica-nanoparticles-for-controlled-drug-delivery
#16
Liucheng Mao, Meiying Liu, Long Huang, Dazhuang Xu, Qing Wan, Guangjian Zeng, Yanfeng Dai, Yuanqing Wen, Xiaoyong Zhang, Yen Wei
Surface modification of mesoporous silica nanoparticles (MSNs) with functional polymers has become one of the most interest topics over the last decade. Among various surface modification strategies, surface-initiated atom transfer radical polymerization (ATRP) has been regarded as one of the most effective methods. However, the typical ATRP strategy is relied on the transition metal ions and their organic ligands as the polymerization catalyst systems. In this work, a novel surface-initiated ATRP method was established for surface functionalization of MSNs using 10-Phenylphenothiazine (PTH) as the catalyst, 2-methacryloyloxyethyl phosphorylcholine (MPC) and itaconic acid (IA) as the monomers...
October 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28629057/a-facile-strategy-for-fabrication-of-aggregation-induced-emission-aie-active-fluorescent-polymeric-nanoparticles-fpns-via-post-modification-of-synthetic-polymers-and-their-cell-imaging
#17
Yanzhu Liu, Liucheng Mao, Xinhua Liu, Meiying Liu, Dazhuang Xu, Ruming Jiang, Fengjie Deng, Yongxiu Li, Xiaoyong Zhang, Yen Wei
Aggregation-induced emission (AIE) active fluorescent polymeric nanoparticles (FPNs) have recently emerged as the promising nanoprobes for biological imaging for their intensive fluorescence, good photostability, desirable biocompatibility and well designability of structure and optical properties. Herein, we proposed a novel strategy for fabrication of AIE-active FPNs through the post modification of synthetic copolymers to form Schiff base. The size, morphology, optical properties and biocompatibility as well as cell uptake behavior were evaluated in detailed...
October 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28628950/flexible-fused-azomethine-boron-complex-thermochromic-luminescence-and-thermosalient-behaviors-in-structural-transitions-between-crystalline-polymorphs
#18
Shunsuke Ohtani, Masayuki Gon, Kazuo Tanaka, Yoshiki Chujo
This manuscript reports the multi-functional boron complex presenting aggregation-induced emission (AIE), crystallization-induced emission enhancement (CIEE) and thermosalient behaviors accompanying thermochromic luminescence during crystal-crystal transitions by employing the fused azomethine ligand. In particular, we propose that these properties can be explained by molecular "flexibility" toward external stimuli including temperature changes and photo-excitation, and two types of crystal polymorphs having different absorption and luminescent properties were obtained...
June 19, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28628944/bistable-solid-state-fluorescence-switching-in-photoluminescent-infinitely-coordinated-polymer
#19
Jincheol Kim, Youngmin You, Seong-Jun Yoon, Jong H Kim, Boseok Kang, Sang Kyu Park, Dong Ryeol Whang, Jangwon Seo, Kilwon Cho, Soo Young Park
Photo-functional infinitely coordinated polymers (ICPs) consisting of the photochromic dithienylethene (DTE) and the luminescent bridging unit to give enhanced fluorescence in the solid state were synthesized. We could fabricate well-ordered micropatterns of these ICPs by a soft-lithographic method, which repeatedly showed high contrast on-off fluorescence switching.
June 19, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28628774/a-segmentation-method-for-myocardial-ischemia-infarction-applicable-in-heart-photos
#20
Salety Ferreira Baracho, Daniel José Lins Leal Pinheiro, Carlos Marcelo Gurjão de Godoy, Regina Célia Coelho
The myocardial infarction, known as heart attack, is the ultimate result of a prolonged/untreated cardiac ischemia. The accurate segmentation of the myocardial infarction or ischemia in images obtained from diversified sources, such as Magnetic Resonance Images or Echocardiograph, is worthwhile for the medical area or the animal experimentation. An alternative image source for ischemia/infarction segmentation is the photo, which can depict the actual heart image. This work presents a method for ischemia segmentation in rat heart photos...
June 7, 2017: Computers in Biology and Medicine
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