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https://www.readbyqxmd.com/read/28723180/black-phosphorus-quantum-dots-as-the-ratiometric-fluorescence-probe-for-trace-mercury-ion-detection-based-on-inner-filter-effect
#1
Wei Gu, Xueyu Pei, Yuxiao Cheng, Cuiling Zhang, Jidong Zhang, Yinghan Yan, Caiping Ding, Yuezhong Xian
In this work, a novel ratiometric fluorescence sensor has been constructed for the selective and sensitive detection of Hg(2+), which is based on the inner filter effect (IFE) of tetraphenylporphyrin tetrasulfonic acid (TPPS) toward black phosphorus quantum dots (BP QDs). Highly fluorescent BP QDs were successfully synthesized from bulk BP by sonication-assisted solvothermal method via a top-down route. In the presence of Hg(2+), the IFE originating from spectral overlap between the excitation of BP QDs and the absorption of TPPS is inhibited and the fluorescence of BP QDs is restored...
April 28, 2017: ACS Sensors
https://www.readbyqxmd.com/read/28714665/correction-to-red-emissive-sulfur-nitrogen-codoped-carbon-dots-and-their-application-in-ion-detection-and-theranostics
#2
Xiang Miao, Xinlong Yan, Dan Qu, Dabing Li, Franklin Feng Tao, Zaicheng Sun
No abstract text is available yet for this article.
July 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28714204/investigation-on-the-ph-independent-photoluminescence-emission-from-carbon-dots-impregnated-on-polymer-matrix
#3
Pichan Saheeda, Kaviladath Sabira, Mohandas Dhaneesha, Sankaran Jayaleksmi
Highly luminescent, polymer nanocomposite films based on poly(vinyl alcohol) (PVA), and monodispersed carbon dots (C-dots) derived from multiwalled carbon nanotubes (MWCNTs), as coatings on substrates as well as free standing ones are obtained via solution-based techniques. The synthesized films exhibit pH-independent photoluminescence (PL) emission, which is an advantageous property compared with the pH-dependent photoluminescence intensity variations, generally observed for the C-dots dispersed in aqueous solution...
July 17, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28710930/immobilization-effects-on-the-photocatalytic-activity-of-cds-quantum-dots-horseradish-peroxidase-hybrid-nanomaterials
#4
Iker Iñarritu, Eduardo Torres, Antonio Topete, José Campos-Terán
The potential use of hybrid nanomaterials based on inorganic optically active nanoparticles known as quantum dots (QDs) and horseradish peroxidase (HRP) has been proposed by several authors as light-controllable nanocatalyzers, moreover, the immobilization within or over silica based supports represents an advantage over bulk-dispersed systems. However, the implications of the immobilization of such hybrid photoactivatable catalyzing systems have not been clarified with detail. Here, we present a thorough study of the functional photoactive efficiency and recycling of immobilized CdS QDs and HRP systems with different configurations, immobilized over silanized silica quartz crystal microbalance (QCM) sensors, allowing an accurate measure of the immobilized mass of each component and its correlation with the initial reaction rate of conversion of Amplex Red (AR) to resorufin...
July 6, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28703004/sialylglycan-assembled-supra-dots-for-ratiometric-probing-and-blocking-of-human-infecting-influenza-viruses
#5
Chang-Zheng Wang, Hai-Hao Han, Xin-Ying Tang, Dong-Ming Zhou, Changfeng Wu, Guo-Rong Chen, Xiao-Peng He, He Tian
The seasonal outbreak of influenza causes significant morbidity and mortality worldwide because a number of influenza virus (IV) strains have been shown to infect and circulate in humans. Development of effective means to timely monitor as well as block IVs is still a challenging task. Whereas conventional fluorescence probes rely on a fluorimetric change upon recognizing IVs, here we developed simple "Supra-dots" that are formed through the aqueous supramolecular assembly between a blue-emitting polymer dot and red-emitting sialylglycan probes for the ratiometric detection of IVs...
July 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28700514/low-volume-high-intensity-interval-versus-continuous-endurance-training-effects-on-hematological-and-cardiorespiratory-system-adaptations-in-professional-canoe-polo-athletes
#6
Mohsen Sheykhlouvand, Mohammadali Gharaat, Erfan Khalili, Hamid Agha-Alinejad, Farhad Rahmaninia, Hamid Arazi
The aim of this study was to compare the effect of two paddling-based high-intensity interval training (HIIT) and continuous endurance training (CET) on hematological, immunological, and cardiorespiratory adaptations in professional canoe polo athletes. Twenty one male canoe polo athletes were randomly divided into one of three groups (N=7): 1) HIIT with variable intensity (VIHIIT) (6×60-second at 100,110,120,130,130, 130,120,110,100% vV[Combining Dot Above]O2peak from 1 to 9 session respectively, 1:3 work to recovery ratio); 2) HIIT with variable volume (VVHIIT) (6,7,8,9,9,9,8,7,6 repetitions/session from 1 to 9 session respectively)×60-second at lowest velocity that elicited V[Combining Dot Above]O2peak (vV[Combining Dot Above]O2peak), 1:3 work to recovery ratio); and 3) the CET group performed 3 times × 60 min paddling sessions (75% vV[Combining Dot Above]O2peak) per week for 3 weeks...
July 8, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28700134/dual-fluorescence-nano-conjugates-for-ratiometric-detection-of-reactive-oxygen-species-in-inflammatory-cells
#7
Yuxiang Ma, Qian Wang, Qiuyun Zhu, Mengyang Liu, Dan Chen, Zhihao Han, Congying Zhang, Liwei Lv, Yueqing Gu
Reactive oxygen species (ROS) are largely produced under pathological situations. To understand the etiology of disease, it is urgent to develop efficacious probes for detecting ROS. Herein, a novel nano-conjugate detection system constructed from gold clusters (AuNCs) and quantum dots (QDs) for fluorescence ratio metric sensing ROS was reported. Upon interacting with ROS, the red emission fluorescence (645 nm from QDs) in the detection system was gradually decreased, while the green fluorescence (480 nm from AuNCs) changed little...
July 12, 2017: Journal of Biophotonics
https://www.readbyqxmd.com/read/28696052/dermoscopic-and-reflectance-confocal-microscopy-features-of-cutaneous-squamous-cell-carcinoma
#8
Marco Manfredini, Caterina Longo, Ferrari Barbara, Simonetta Piana, Elisa Benati, Alice Casari, Giovanni Pellacani, Elvira Moscarella
BACKGROUND: Squamous cell carcinoma (SCC) of the skin is a highly prevalent neoplasm. The management and the prognosis of this tumor is dependent on its invasiveness and its grade of differentiation. OBJECTIVES: To evaluate whether specific dermoscopic and reflectance confocal microscopy (RCM) criteria can predict the diagnosis of invasive SCC vs in situ SCC and poorly differentiated compared with well- and moderately differentiated SCC. METHODS: Dermoscopic and RCM images of SCCs were retrospectively evaluated for the presence of predefined criteria...
July 11, 2017: Journal of the European Academy of Dermatology and Venereology: JEADV
https://www.readbyqxmd.com/read/28695733/efficient-all-solution-processed-quantum-dot-light-emitting-diodes-based-on-inkjet-printing-technique
#9
Yang Liu, Fushan Li, Zhongwei Xu, Congxiu Zheng, Tailiang Guo, Xiangwei Xie, Lei Qian, Dong Fu, Xiaolin Yan
Quantum dot light emitting diodes (QLEDs) are increasingly attractive owing to their compatibility with the inkjet printing process and potential application in low-cost large-area full-color pixelated display. The strategy for controlling the morphology of the quantum dot layer is definitely critical for realizing all-solution processed QLEDs with high performance, which certainly requires in-depth thinking regarding the design of ink composition and their optimization in the printing process. Herein, by carefully controlling the quantum dot ink composition and physicochemical properties, we demonstrate that the viscosity, contact angle, and the three-phase contact line moving would affect the final morphology of the quantum dot film formed by inkjet printing...
July 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28683540/composition-tunable-optical-properties-of-zn-x-cd-1%C3%A2-%C3%A2-x-s-quantum-dot-carboxymethylcellulose-conjugates-towards-one-pot-green-synthesis-of-multifunctional-nanoplatforms-for-biomedical-and-environmental-applications
#10
Alexandra A P Mansur, Herman S Mansur, Anderson J Caires, Rafael L Mansur, Luiz C Oliveira
Quantum dots (QDs) are colloidal semiconductor nanocrystals with unique properties that can be engineered by controlling the nanoparticle size and chemical composition by doping and alloying strategies. However, due to their potential toxicity, augmenting their biocompatibility is yet a challenge for expanding to several biomedical and environmentally friendly applications. Thus, the main goal of this study was to develop composition-tunable and biocompatible Zn x Cd1 - x S QDs using carboxymethylcellulose polysaccharide as direct capping ligand via green colloidal aqueous route at neutral pH and at room temperature for potential biomedical and environmental applications...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28679040/sizing-up-excitons-in-core-shell-quantum-dots-via-shell-dependent-photoluminescence-blinking
#11
Aidan A E Fisher, Mark A Osborne
Semiconductor nanocrystals or quantum dots (QDs) are now widely used across solar cell, display and bioimaging technologies. While advances in multi-shell, alloyed and multinary core-shell QD structures have led to improved light-harvesting and photoluminescence (PL) properties of these nanomaterials, the effects that QD-capping have on the exciton-dynamics that govern PL-instabilities such as blinking in single-QDs, is not well understood. We report experimental measurements of shell-size dependent absorption and PL-intermittency in CdSe-CdS QDs that are consistent with a modified charge-tunnelling, self-trapping (CTST) description of the exciton-dynamics in these nanocrystals...
July 5, 2017: ACS Nano
https://www.readbyqxmd.com/read/28675929/red-yellow-and-blue-luminescence-by-graphene-quantum-dots-syntheses-mechanism-and-cellular-imaging
#12
Tian Gao, Xi Wang, Li-Yun Yang, Huan He, Xiao-Xu Ba, Jie Zhao, Feng-Lei Jiang, Yi Liu
Owing to their excellent photoluminescence (PL) properties, good biocompatibility, and low toxicity, graphene quantum dots (GQDs) are widely applied in bioimaging, biosensing, and so forth. However, further development of GQDs is limited by their synthetic methodology and unclear PL mechanism. Therefore, it is urgent to find efficient and universal methods for the synthesis of GQDs with high stability, controllable surface properties, and tunable PL emission wavelength. By coating with polyethyleneimine (PEI) of different molecular weights, blue-, yellow-, and red-emitting GQDs were successfully prepared...
July 12, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28671452/multifunctional-nanoplatform-based-on-black-phosphorus-quantum-dots-for-bioimaging-and-photodynamic-photothermal-synergistic-cancer-therapy
#13
Yi Li, Zhiming Liu, Yuqing Hou, Guangcun Yang, Xixi Fei, Henan Zhao, Yanxian Guo, Chengkang Su, Zhen Wang, Huiqing Zhong, Zhengfei Zhuang, Zhouyi Guo
A multifunctional nanoplatform based on black phosphorus quantum dots (BPQDs) was developed for cancer bioimaging and combined photothermal therapy (PTT) and photodynamic therapy (PDT). BPQDs were functionalized with PEG chains to achieve improved biocompatibility and physiological stability. The as-prepared nanoparticles exhibite prominent near-infrared (NIR) photothermal and red-light-triggered photodynamic properties. The combined therapeutic application of PEGylated BPQDs were then performed in vitro and in vivo...
July 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28670695/meat-allergy-associated-with-%C3%AE-gal-closing-diagnostic-gaps-by-anti-%C3%AE-gal-ige-immune-profiling
#14
U Jappe, S Minge, B Kreft, A Ludwig, B Przybilla, A Walker, R Varga, P Seidel, T Biedermann, W Anemüller, A Kromminga, F Ruëff, H Merk, N Wagner, R Treudler, M Worm, I Waldmann, J Saloga, W M Becker, T Goldmann, T A Platts-Mills, A Homann
BACKGROUND: Glycoproteins and glycolipids of some mammalian species contain the disaccharide galactosyl-α-(1,3)-galactose (α-Gal). It is known that α-Gal is immunogenic in humans and causes glycan-specific IgG and also IgE responses with clinical relevance. α-Gal is part of the IgE-reactive monoclonal therapeutic antibody cetuximab and is associated with delayed anaphylaxis to red meat. In this study, different alpha-Gal-containing analytes are examined in singleplex and multiplex assays to resolve individual sensitization patterns with IgE against α-Gal...
July 3, 2017: Allergy
https://www.readbyqxmd.com/read/28670359/red-dot-basal-cell-carcinoma
#15
Philip R Cohen
Red dot basal cell carcinoma, a distinctive morphologic variant of basal cell carcinoma that presents as a small red macule (dot) or papule, is described on a woman's thigh. A high index of suspicion is necessary to consider the diagnosis since the tumor mimics a telangiectasia or an angioma.
May 2017: Journal of Clinical and Aesthetic Dermatology
https://www.readbyqxmd.com/read/28652643/hybrid-tandem-quantum-dot-organic-photovoltaic-cells-with-complementary-near-infrared-absorption
#16
Taesoo Kim, Elenita Palmiano, Ru-Ze Liang, Hanlin Hu, Banavoth Murali, Ahmad R Kirmani, Yuliar Firdaus, Yangqin Gao, Arif Sheikh, Mingjian Yuan, Omar F Mohammed, Sjoerd Hoogland, Pierre M Beaujuge, Edward H Sargent, Aram Amassian
Monolithically integrated hybrid tandem solar cells that effectively combine solution-processed colloidal quantum dot (CQD) and organic bulk heterojunction subcells to achieve tandem performance that surpasses the individual subcell efficiencies have not been demonstrated to date. In this work, we demonstrate hybrid tandem cells with a low bandgap PbS CQD subcell harvesting the visible and near-infrared photons and a polymer:fullerene-poly (diketopyrrolopyrrole-terthiophene) (PDPP3T):[6,6]-phenyl-C60-butyric acid methyl ester (PC61BM)-top cell absorbing effectively the red and near-infrared photons of the solar spectrum in a complementary fashion...
May 29, 2017: Applied Physics Letters
https://www.readbyqxmd.com/read/28641680/ophthalmological-evaluation-of-integrated-resistance-and-aerobic-training-during-70-day-bed-rest
#17
Giovanni Taibbi, Ronita L Cromwell, Susana B Zanello, Patrice O Yarbough, Robert J Ploutz-Snyder, Bernard F Godley, Gianmarco Vizzeri
INTRODUCTION: We evaluated ophthalmic changes in healthy individuals who underwent integrated resistance and aerobic training (iRAT) during 70-d 6° head-down tilt (HDT) bed rest (BR). METHODS: Participants were selected using NASA standard screening procedures. Standardized NASA BR conditions were implemented. Subjects were randomly assigned to the iRAT protocol or no exercise during HDTBR. Weekly ophthalmic examinations were performed in the sitting (pre/post-BR only) and HDT (BR only) positions...
July 1, 2017: Aerospace Medicine and Human Performance
https://www.readbyqxmd.com/read/28629971/survey-of-pathogens-in-threatened-wild-red-tailed-amazon-parrot-amazona-brasiliensis-nestlings-in-rasa-island-brazil
#18
Frederico Fontanelli Vaz, Patrícia Pereira Serafini, Rosangela Locatelli-Dittrich, Rafael Meurer, Edison Luiz Durigon, Jansen de Araújo, Luciano Matsumiya Thomazelli, Tatiana Ometto, Elenise Angelotti Bastos Sipinski, Rafael Meirelles Sezerban, Maria Cecília Abbud, Tânia Freitas Raso
The red-tailed Amazon parrot (Amazona brasiliensis) is a threatened species of psittacine bird that inhabit coastal regions of Brazil. In view of the threat of this species, the aim of this study was to perform a health evaluation in wild nestlings in Rasa Island, determining the prevalence of enterobacteria and infectious agents according to type of nest. Blood samples were collected from 64 birds and evaluated for antibodies of Chlamydia psittaci by commercial dot-blot ELISA. Cloacal and oropharyngeal swabs samples were collected from 23 birds from artificial wooden nests, 15 birds from PVC nests and 2 birds from natural nests for microbiological analysis...
June 3, 2017: Brazilian Journal of Microbiology: [publication of the Brazilian Society for Microbiology]
https://www.readbyqxmd.com/read/28627498/highly-stable-red-emitting-polymer-dots-for-cellular-imaging
#19
Jipsa Chelora, Jinfeng Zhang, Rui Chen, Hrisheekesh Thachoth Chandran, Chun-Sing Lee
Polymer dots (Pdots) have emerged as a new type of fluorescent probe material for biomedical applications and have attracted great interest due to their excellent optical properties and biocompatability. In this work, we report on a red-emitting P3HT Pdot fluorescent probe for intracellular bioimaging. The as-prepared Pdot fluorescent probe exhibits good stability and has a large Stokes shift (121 nm) compared to molecules in tetrahydrofuran (THF). Furthermore, the probe shows low cytotoxicity, broad absorption spectrum, resistance against photodegradation, and good water dispersibility...
June 19, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28609972/a-new-species-of-the-genus-i-microhyla-i-anura-microhylidae-from-eastern-nepal
#20
Janak Raj Khatiwada, Guo Cheng Shu, Shou Hong Wang, Arjun Thapa, Bin Wang, Jianping Jiang
A new species of the genus Microhyla is described from Jamun Khadi, Jhapa district of eastern Nepal, based on molecular and morphological comparisons. This species is the sister taxon of Microhyla ornata and can be distinguished by a unique vocalization, morphology and molecular phylogeny. The uncorrected genetic divergences based on rRNA gene between the new species and its closest congeners, M. nilphamariensis, M. ornata and M. rubra were 5.34%, 6.67%, and 8.31%, respectively. The new species, Microhyla taraiensis sp...
April 12, 2017: Zootaxa
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