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https://www.readbyqxmd.com/read/28629971/survey-of-pathogens-in-threatened-wild-red-tailed-amazon-parrot-amazona-brasiliensis-nestlings-in-rasa-island-brazil
#1
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
#2
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
#3
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
https://www.readbyqxmd.com/read/28590430/design-and-fabrication-of-a-ratiometric-planar-optode-for-simultaneous-imaging-of-ph-and-oxygen
#4
Zike Jiang, Xinsheng Yu, Yingyan Hao
This paper presents a simple, high resolution imaging approach utilizing ratiometric planar optode for simultaneous measurement of dissolved oxygen (DO) and pH. The planar optode comprises a plastic optical film coated with oxygen indicator Platinum(II) octaethylporphyrin (PtOEP) and reference quantum dots (QDs) embedded in polystyrene (PS), pH indicator 5-Hexadecanoylamino-fluorescein (5-Fluorescein) embedded in Hydromed D4 matrix. The indicator and reference dyes are excited by utilizing an LED (Light Emitting Diode) source with a central wavelength of 405 nm, the emission respectively matches the different channels (red, green, and blue) of a 3CCD camera after eliminating the excitation source by utilizing the color filter...
June 7, 2017: Sensors
https://www.readbyqxmd.com/read/28585624/exploiting-the-biomimetic-and-luminescence-properties-of-multivalent-dendrimer-semiconductor-nanohybrid-materials-in-the-ultra-low-level-determination-of-folic-acid
#5
Somashree Kundu, Susmita Maiti, Tushar Kanti Das, Debasmita Ghosh, Chandra Nath Roy, Abhijit Saha
In view of the enhanced generation of folate receptors in cancerous cells and diseases linked to the deficiency of folic acid, such as anemia, mental devolution, congenital malformation, etc., the development of a simple method for the ultra-sensitive determination of folic acid remains a long-standing issue for practical applications in medicine and biotechnology. Thus, the proposed luminescence based strategy involving multifunctional poly(amidoamine) (PAMAM) dendrimer encapsulated quantum dots (QDs) as a probe provides a simple, fast and efficient method for the selective determination of folic acid at the nano-molar level...
June 6, 2017: Analyst
https://www.readbyqxmd.com/read/28584229/circadian-tunable-perovskite-quantum-dot-based-down-converted-multi-package-white-led-with-a-color-fidelity-index-over-90
#6
Hee Chang Yoon, Ji Hye Oh, Soyoung Lee, Jae Byung Park, Young Rag Do
New metrics of the color and circadian performances of down-converted white light-emitting diodes (DC-WLEDs) are rapidly becoming popular in smart lighting systems. This is due to the increased desire for accurate analytical methods to measure the effects of newly developed quantum dot (QD)-based lighting on the vision, color, and circadian sensors of retina cells in the human eye. In this regard, a two-measure system known as technical memorandum TM-30-2015 (Illuminating Engineering Society of North America), encompassing the color fidelity index (CFI, R f ) and the color gamut index (CGI, R g ), has been developed as a new metrics of color to replace the currently utilized color rendering index (CRI, R a )...
June 5, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28582961/synthesis-of-reabsorption-suppressed-type-ii-type-i-znse-cds-zns-core-shell-quantum-dots-and-their-application-for-immunosorbent-assay
#7
Sheng Wang, Jin Jie Li, Yanbing Lv, Ruili Wu, Ming Xing, Huaibin Shen, Hongzhe Wang, Lin Song Li, Xia Chen
We report a phosphine-free one-pot method to synthesize ZnSe/CdS/ZnS core-shell quantum dots (QDs) with composite type-II/type-I structures and consequent reabsorption suppression properties. The as-synthesized QDs possess high efficient red emission (with quantum yield of 82%) and high optical stability. Compared to type-I QDs, the ZnSe/CdS/ZnS QDs show larger Stokes shift and lower reabsorption which can reduce the emission loss and improve the level of fluorescence output. The ZnSe/CdS/ZnS QDs are used as fluorescent labels to exploit their application in fluorescence-linked immunosorbent assay (FLISA) for the first time in the detection of C-reactive protein (CRP) with a limit of detection (LOD) of 0...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28582592/indium-phosphide-based-quantum-dots-with-shell-enhanced-absorption-for-luminescent-down-conversion
#8
Dorian Dupont, Mickael D Tessier, Philippe F Smet, Zeger Hens
It is shown that admixing small amounts of cadmium into the shell of InP/ZnSe core/shell quantum dots results in an increased absorption of blue light and a limited redshift of the band-edge emission. These effects reflect the reduced bandgap of (Zn,Cd)Se alloys and their smaller conduction-band offset with InP. Nevertheless, adjusting the InP core size enables InP/ZnSe and InP/(Zn,Cd)Se quantum dots with identical emission characteristics to be made. Processing both materials into remote phosphor disks, it is demonstrated that the shell-enhanced absorbance of InP/(Zn,Cd)Se has the double benefit of suppressing self-absorption and reducing the amount of quantum dots by weight needed to attain a given blue-to-red color conversion...
June 5, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28569064/full-spectral-fine-tuning-visible-emissions-from-cation-hybrid-cs1-mfampbx3-x-cl-br-and-i-0-%C3%A2-m-%C3%A2-1-quantum-dots
#9
Daqin Chen, Xiao Chen, Zhongyi Wan, Gaoliang Fang
Full-color visible emissions are particularly crucial for applications in displays and lightings. In this work, we developed a facile room-temperature ligand-assisted supersaturated recrystallization synthesis of monodisperse, cubic structure Cs1-mFAmPbX3 (X = Cl, Br, and I or their mixtures Cl/Br and Br/I, 0 ≤ m ≤ 1) hybrid perovskite quantum dots (QDs). Impressively, cation substitution of Cs(+) by FA(+) was beneficial in finely tuning the band gap and in exciton recombination kinetics, improving the structural stability, and raising the absolute quantum yields up to 85%...
June 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28560214/clinical-and-histopathological-findings-of-frontal-fibrosing-alopecia-associated-lichen-planus-pigmentosus
#10
Ricardo Romiti, Camila Fátima Biancardi Gavioli, Alessandra Anzai, Andréia Munck, Carolina Oliveira Costa Fechine, Neusa Y S Valente
BACKGROUND: Frontal fibrosing alopecia (FFA) is a primary lymphocytic scarring alopecia occurring mainly in postmenopausal women. A range of facial lesions have been described in FFA, such as lichen planus (LP) pigmentosus, red dots, facial papules, and perifollicular and diffuse erythema. These lesions can be the first sign of FFA. LP pigmentosus is a rare variant of LP. The first description of LP pigmentosus associated with FFA (in 2012) reported 22 cases of LP pigmentosus among 44 cases of FFA affecting South African patients...
May 2017: Skin Appendage Disorders
https://www.readbyqxmd.com/read/28553007/histology-and-ultrastructure-of-the-integumental-chromatophores-in-tokay-gecko-gekko-gecko-linnaeus-1758-skin
#11
Paweł Szydłowski, Jan Paweł Madej, Marta Mazurkiewicz-Kania
This paper describes the relationship between the arrangement of dermal chromatophores in tokay gecko (Gekko gecko) skin and the formation of wild-type colouration, with emphasis on the ultrastructure of chromatophores. The samples of the tokay gecko skin were collected from wild-type colouration adult specimens. Morphology and distribution of chromatophores was determined by using light microscopy and transmission electron microscopy. The present study revealed that orange/red coloured skin of G. gecko contained erythrophores, which were located under basement membrane, and usually comprised deeper situated iridophores and melanophores which were form single layer with iridophores or were occupying the deepest region of dermis...
2017: Zoomorphology
https://www.readbyqxmd.com/read/28548170/efficient-quantum-dot-light-emitting-diodes-with-a-zn0-85mg0-15o-interfacial-modification-layer
#12
Yizhe Sun, Yibin Jiang, Huiren Peng, Jiangliu Wei, Shengdong Zhang, Shuming Chen
Efficient inverted quantum-dot (QD) light-emitting diodes (LEDs) are demonstrated by using 15% Mg doped ZnO (Zn0.85Mg0.15O) as an interfacial modification layer. By doping Mg into ZnO, the conduction band level, the density of oxygen vacancies and the conductivity of the ZnO can be tuned. To suppress excess electron injection, a 13 nm Zn0.85Mg0.15O interlayer with a relatively higher conduction band edge and lower conductivity is inserted between the ZnO electron transport layer and QD light-emitting layer, which improves the balance of charge injection and blocks the non-radiative pathway...
May 26, 2017: Nanoscale
https://www.readbyqxmd.com/read/28541652/polymer-as-an-additive-in-the-emitting-layer-for-high-performance-quantum-dot-light-emitting-diodes
#13
Feng Liang, Yuan Liu, Yun Hu, Ying-Li Shi, Yu-Qiang Liu, Zhao-Kui Wang, Xue-Dong Wang, Bao-Quan Sun, Liang-Sheng Liao
A facile but effective method is proposed to improve the performance of quantum dot light-emitting diodes (QLEDs) by incorporating a polymer, poly(9-vinlycarbazole) (PVK), as an additive into the CdSe/CdS/ZnS quantum dot (QD) emitting layer (EML). It is found that the charge balance of the device with the PVK-added EML was greatly improved. In addition, the film morphology of the hole-transporting layer (HTL) which is adjacent to the EML, is substantially improved. The surface roughness of the HTL is reduced from 5...
June 1, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28537370/red-emissive-carbon-dots-for-fingerprints-detection-by-spray-method-coffee-ring-effect-and-unquenched-fluorescence-in-drying-process
#14
Jie Chen, Ji-Shi Wei, Peng Zhang, Xiao-Qing Niu, Wei Zhao, Ze-Yang Zhu, Hui Ding, Huan-Ming Xiong
Brightly red fluorescent carbon dots are synthesized hydrothermally and dissolved in diluted hydrochloric acid solution. Such carbon dots exhibit excitation-independent emission at about 620 nm with quantum yield over 10%, which is visible in daylight. After the carbon dots solution is sprayed to the fingerprints on various solid substrates and dried in air, clear fingerprints can be seen under an ultraviolet lamp and stay stable for 1 day. Detailed characterizations suggest that during the drying process, the coffee-ring effect and the electrostatic interactions between the carbon dots and the fingerprint residues prevent the typical aggregation-induced fluorescence quenching of carbon dots...
June 7, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28531196/co-inheritance-of-glucose-6-phosphate-dehydrogenase-deficiency-mutations-and-hemoglobin-e-in-a-kachin-population-in-a-malaria-endemic-region-of-southeast-asia
#15
Zeshuai Deng, Fang Yang, Yao Bai, Lijun He, Qing Li, Yanrui Wu, Lan Luo, Hong Li, Limei Ma, Zhaoqing Yang, Yongshu He, Liwang Cui
Glucose-6-phosphate dehydrogenase (G6PD) deficiency and hemoglobin E (HbE, β26 Glu-Lys) are two common red cell disorders in Southeast Asia. G6PD deficiency produces hemolytic anemia, which can be triggered by certain drugs or infections. HbE is asymptomatic or is manifested as microcytic, minimally hemolytic anemia. The association between G6PD deficiency and HbE is little understood. This study aimed to investigate G6PD deficiency and HbE in a Kachin ethnic group in the China-Myanmar border area. G6PD enzyme activity was measured using a quantitative G6PD assay, G6PD variants genotyped by the SNaPshot assay, and an HbE gene mutation identified by an amplification refractory mutation system and subsequently confirmed by using a reverse dot blot hybridization assay from 100 unrelated individuals in the study area...
2017: PloS One
https://www.readbyqxmd.com/read/28530803/red-phosphorus-nanodots-on-reduced-graphene-oxide-as-a-flexible-and-ultra-fast-anode-for-sodium-ion-batteries
#16
Yihang Liu, Anyi Zhang, Chenfei Shen, Qingzhou Liu, Xuan Cao, Yuqiang Ma, Liang Chen, Christian Lau, Tian-Chi Chen, Fei Wei, Chongwu Zhou
Sodium-ion batteries offer an attractive option for potential low cost and large scale energy storage due to the earth abundance of sodium. Red phosphorus is considered as a high capacity anode for sodium-ion batteries with a theoretical capacity of 2596 mAh/g. However, similar to silicon in lithium-ion batteries, several limitations, such as large volume expansion upon sodiation/desodiation and low electronic conductance, have severely limited the performance of red phosphorus anodes. In order to address the above challenges, we have developed a method to deposit red phosphorus nanodots densely and uniformly onto reduced graphene oxide sheets (P@RGO) to minimize the sodium ion diffusion length and the sodiation/desodiation stresses, and the RGO network also serves as electron pathway and creates free space to accommodate the volume variation of phosphorus particles...
June 14, 2017: ACS Nano
https://www.readbyqxmd.com/read/28530759/a-dual-emission-probe-to-detect-moisture-and-water-in-organic-solvents-based-on-green-tb-3-post-coordinated-metal-organic-frameworks-with-red-carbon-dots
#17
Jing-Xing Wu, Bing Yan
Using p-phenylenediamine as a precursor, p-carbon dots (p-CDs) with strong red-light emission were encapsulated into a metal-organic framework (MOF) followed by introduction of green light-emitting Tb(3+) to form a two-color light-emitting hybrid (Tb(3+)@p-CDs/MOF). The as-prepared fluorescent-functionalized MOF not only maintained the excellent optical properties of p-CDs and Tb(3+) to give strong emission, but also had good chemical and physical properties. The chosen p-CDs were aggregated readily in water, which led to only very weak photoluminescence, whereas the opposite effect was noted in the organic solvents ethanol, dimethylformamide and cyclopropane...
May 30, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28524654/polyethylenimine-insulativity-dominant-charge-injection-balance-for-highly-efficient-inverted-quantum-dot-light-emitting-diodes
#18
Ke Ding, Hongting Chen, Lianwei Fan, Bo Wang, Zhi Huang, Shaoqing Zhuang, Bin Hu, Lei Wang
Quantum dot (QD) light-emitting diodes (QLEDs) with an inverted architecture suffer from charge-injection imbalance and severe QD charging, which degrade device performance. Blocking excess electron injection into QDs is crucial for efficient inverted QLEDs. It is observed that polyethylenimine (PEI) has two opposite effects on electron injection: one is blocking electron injection by its intrinsic insulativity and the other one is promoting electron injection by reducing the work function of ZnO/PEI. In this work, the insulating nature of PEI has been dominantly utilized to reduce electron injection and the charge-injection balance is realized when PEI becomes thicker and blocks more excess electrons...
June 2, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28516780/dual-colored-carbon-dot-ratiometric-fluorescent-test-paper-based-on-a-specific-spectral-energy-transfer-for-semiquantitative-assay-of-copper-ions
#19
Cui Liu, Dianhua Ning, Cheng Zhang, Zhengjie Liu, Ruilong Zhang, Jun Zhao, Tingting Zhao, Bianhua Liu, Zhongping Zhang
Classical pH test papers are widely used to measure the acid-base degree of media in a qualitative or semiquantitative manner. However, the extension of portable and inexpensive methods to a wide range of analytes so as to eliminate the tediousness of instrumental assays remains unsuccessful. Here, we report a novel kind of dual-colored carbon dot (CD) ratiometric fluorescent test paper for the semiquantitative assay of copper ions (Cu(2+)) by a dose-sensitive color evolution. The preparation of the test paper is based on the following two interesting findings: on the one hand, residual p-phenylenediamine at the surface of as-synthesized red CDs (r-CDs) efficiently binds Cu(2+) ions to produce a strong visible absorption that overlaps the emission of blue CDs (b-CDs); on the other hand, the Cu(2+) ions render the adsorption of small b-CDs onto the surface of larger r-CDs through their dual-coordinating interactions with the surface ligands of both r-CDs and b-CDs...
June 7, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28514951/a-computerized-red-glass-test-for-quantifying-diplopia
#20
Han Soo Yoo, Eunjeong Park, Soolienah Rhiu, Hyuk-Jae Chang, Kyoungsub Kim, Joonsang Yoo, Ji Hoe Heo, Hyo Suk Nam
BACKGROUND: Accurate evaluation of diplopia during bedside physical examination is challenging. We developed a new computerized red glass test (CRT) to detect, localize, and quantify diplopia and investigated whether the CRT is useful and feasible. METHODS: During the CRT, a white dot randomly appears on a monitor. Because a red glass is applied on the right eye, a patient can see one white dot and one red dot when diplopia is present. We defined the degree of diplopia as the direct distance of the two points with the largest deviation and compared the degree with the Hess score and Hess area ratio...
May 17, 2017: BMC Ophthalmology
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