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https://www.readbyqxmd.com/read/28819974/room-temperature-synthesis-of-mn-doped-cesium-lead-halide-quantum-dots-with-high-mn-substitution-ratio
#1
Jingrun Zhu, Xiaoling Yang, Yihua Zhu, Yuanwei Wang, Jin Cai, Jianhua Shen, Luyi Sun, Chunzhong Li
Here we report the room-temperature, atmospheric synthesis of Mn-doped cesium lead halide (CsPbX3) perovskite quantum dots (QDs). The synthesis is performed without any sort of protection, and the dual-color emission mechanism is revealed by density functional theory. The Mn concentration reaches a maximum atomic percentage of 37.73 at%, which is significantly higher in comparison to those achieved in earlier reports via high temperature hot injection method. The optical properties of as-prepared nanocrystals (NCs) remain consistent even after several months...
August 21, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28810342/-study-on-the-excavated-wooden-carved-acupuncture-statue-of-the-western-han-dynasty-in-laoguanshan
#2
L X Huang
The painted red lines on the wooden carved acupuncture statue of Western Han Dynasty in Laoguanshan, illustrate the running courses of the"eleven meridians"on the body surface in the early meridian doctrine. The carved white lines show the body surface running courses of the"twelve meridians"in the meridian doctrine and the Sanjiao images in Sanjiao doctrine. The dots on the wooden carved acupuncture statue are of two categories, one of them is of regulatory, round and concave spots, which are carved before the process of lacquer undercoat...
May 28, 2017: Zhonghua Yi Shi za Zhi, Chinese Journal of Medical History
https://www.readbyqxmd.com/read/28810260/cytoplasmic-lipid-accumulation-characteristic-of-the-cribriform-variant-of-papillary-thyroid-carcinoma
#3
Nami Takada, Mitsuyoshi Hirokawa, Aki Ito, Ayana Suzuki, Miyoko Higuchi, Seiji Kuma, Toshitetsu Hayashi, Tsutomu Daa, Akira Miyauchi
OBJECTIVE: The purpose of this study was to clarify the diagnostic significance of cytoplasmic lipid accumulation (CLIA) in the cribriform variant of papillary thyroid carcinoma (CV-PTC). METHODS: We performed a histological, immunohistochemical, and cytological examination of 35 CV-PTC cases at the Kuma Hospital. CLIA was defined as bubble-like multivacuolation in cytoplasm with distinct cell border. We also examined 100 conventional PTC (con-PTC) cases as controls...
August 16, 2017: Pathobiology: Journal of Immunopathology, Molecular and Cellular Biology
https://www.readbyqxmd.com/read/28791769/fluorescent-polymer-nanoparticles-for-cell-barcoding-in-vitro-and-in-vivo
#4
Bohdan Andreiuk, Andreas Reisch, Marion Lindecker, Gautier Follain, Nadine Peyriéras, Jacky G Goetz, Andrey S Klymchenko
Fluorescent polymer nanoparticles for long-term labeling and tracking of living cells with any desired color code are developed. They are built from biodegradable poly(lactic-co-glycolic acid) polymer loaded with cyanine dyes (DiO, DiI, and DiD) with the help of bulky fluorinated counterions, which minimize aggregation-caused quenching. At the single particle level, these particles are ≈20-fold brighter than quantum dots of similar color. Due to their identical 40 nm size and surface properties, these nanoparticles are endocytosed equally well by living cells...
August 9, 2017: Small
https://www.readbyqxmd.com/read/28791553/sex-differences-in-discrimination-reversal-learning-in-the-guppy
#5
Maria Elena Miletto Petrazzini, Angelo Bisazza, Christian Agrillo, Tyrone Lucon-Xiccato
In several mammalian and avian species, females show a higher performance than males in tasks requiring cognitive flexibility such as the discrimination reversal learning. A recent study showed that female guppies are twice as efficient as males in a reversal learning task involving yellow-red discrimination, suggesting a higher cognitive flexibility in female guppies. However, the possibility exists that the superior performance exhibited by females does not reflect a general sex difference in cognitive abilities, but instead, is confined to colour discrimination tasks...
August 8, 2017: Animal Cognition
https://www.readbyqxmd.com/read/28776236/multifractal-based-nuclei-segmentation-in-fish-images
#6
Nikola Reljin, Marijeta Slavkovic-Ilic, Coya Tapia, Nikola Cihoric, Srdjan Stankovic
The method for nuclei segmentation in fluorescence in-situ hybridization (FISH) images, based on the inverse multifractal analysis (IMFA) is proposed. From the blue channel of the FISH image in RGB format, the matrix of Holder exponents, with one-by-one correspondence with the image pixels, is determined first. The following semi-automatic procedure is proposed: initial nuclei segmentation is performed automatically from the matrix of Holder exponents by applying predefined hard thresholding; then the user evaluates the result and is able to refine the segmentation by changing the threshold, if necessary...
September 2017: Biomedical Microdevices
https://www.readbyqxmd.com/read/28772378/microwave-assisted-polyol-synthesis-of-water-dispersible-red-emitting-eu-3-modified-carbon-dots
#7
Hailong Dong, Ana Kuzmanoski, Tobias Wehner, Klaus Müller-Buschbaum, Claus Feldmann
Eu(3+)-modified carbon dots (C-dots), 3-5 nm in diameter, were prepared, functionalized, and stabilized via a one-pot polyol synthesis. The role of Eu(2+)/Eu(3+), the influence of O₂ (oxidation) and H₂O (hydrolysis), as well as the impact of the heating procedure (conventional resistance heating and microwave (MW) heating) were explored. With the reducing conditions of the polyol at the elevated temperature of synthesis (200-230 °C), first of all, Eu(2+) was obtained resulting in the blue emission of the C-dots...
December 29, 2016: Materials
https://www.readbyqxmd.com/read/28758696/53-efficient-red-emissive-carbon-quantum-dots-for-high-color-rendering-and-stable-warm-white-light-emitting-diodes
#8
Zifei Wang, Fanglong Yuan, Xiaohong Li, Yunchao Li, Haizheng Zhong, Louzhen Fan, Shihe Yang
Red emissive carbon quantum dots (R-CQDs) with quantum yield of 53% is successfully prepared. An ultraviolet (UV)-pumped CQD phosphors-based warm white light-emitting diode (WLED) is realized for the first time and achieves a color rendering index of 97. This work provides a new avenue for the exploration of low cost, environment-friendly, and high-performance CQD phosphors-based warm WLEDs.
July 31, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28752765/gold-embedded-hollow-silica-nanogolf-balls-for-imaging-and-photothermal-therapy
#9
Woraphong Janetanakit, Liping Wang, Karla Santacruz-Gomez, Preston B Landon, Paul L Sud, Nirav Patel, Grace Jang, Malvika Jain, Alice Yepremyan, Sami A Kazmi, Deependra K Ban, Feng Zhang, Ratnesh Lal
Hybrid nanocarriers with multifunctional properties have wide therapeutic and diagnostic applications. We have constructed hollow silica nanogolf balls (HGBs) and gold-embedded hollow silica nanogolf balls (Au@SiO2 HGBs) using the layer-by-layer approach on a symmetric polystyrene (PS) Janus template; the template consists of smaller PS spheres attached to an oppositely charged large PS core. ζ Potential measurement supports the electric force-based template-assisted synthesis mechanism. Electron microscopy, UV-vis, and near-infrared (NIR) spectroscopy show that HGBs or Au@SiO2 HGBs are composed of a porous silica shell with an optional dense layer of gold nanoparticles embedded in the silica shell...
August 8, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28742956/fluorescence-and-sensing-applications-of-graphene-oxide-and-graphene-quantum-dots-a-review
#10
Peng Zheng, Nianqiang Wu
Graphene oxide and graphene quantum dots are attractive fluorophores, which are inexpensive, non-toxic, photo-stable, water-soluble, biocompatible and environmentally friendly. They find extensive applications in fluorescent biosensors and chemi-sensors, in which they either serve as fluorophores or quenchers. As fluorophores, they display the tunable photoluminescence emission and the "Giant Red-Edge Effect". As quenchers, they exhibit a remarkable quenching efficiency via either electron transfer or Förster resonance energy transfer (FRET) process...
July 25, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/28738597/sensitive-detection-of-sulfide-based-on-the-self-assembly-of-fluorescent-silver-nanoclusters-on-the-surface-of-silica-nanospheres
#11
Yehan Yan, Kui Zhang, Huan Yu, Houjuan Zhu, Mingtai Sun, Tasawar Hayat, Ahmed Alsaedi, Suhua Wang
Hydrogen sulfide is a toxic and flammable gaseous pollutant often emitted to air as a by-product of water supply, chemical, petroleum and coal industries. It can be transferred into sulfur dioxide in the air under some meteorologic conditions. Herein, we report a novel ratiometric fluorescence method for hydrogen sulfide based on silver nanoclusters and quantum dots. The silver nanoclusters have been self-assemblied onto the surface of silica spheres, which are embedded with red fluorescent quantum dots, to form a dual-emissive nanohybrid...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28735198/impact-of-carbon-quantum-dots-on-dynamic-properties-of-bsa-and-bsa-dppc-adsorption-layers
#12
Lu Lai, Xiao-Qian Wei, Wei-Hua Huang, Ping Mei, Zhao-Hua Ren, Yi Liu
The effects of carbon quantum dots (CQDs) on the dynamic properties of bovine serum albumin (BSA) were investigated using pendant drop profile analysis method. Moreover, the effects of CQDs on the competitive adsorption of BSA and dipalmitoyl phosphatidylcholine (DPPC) were examined. CQDs reduce the fluorescence intensity of BSA and cause a red shift in fluorescence emission. The quenching constant at pH 4.3 is almost twice as large as that of the value obtained at pH 6.0. A small amount of CQDs does not influence the dynamic surface adsorption properties of BSA molecules...
July 17, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28730807/cationic-carbon-dots-for-modification-free-detection-of-hyaluronidase-via-an-electrostatic-controlled-ratiometric-fluorescence-assay
#13
Weiqiang Yang, Jiancong Ni, Fang Luo, Wen Weng, Qiaohua Wei, Zhenyu Lin, Guonan Chen
Carbon dots (CDs) emerge as excellent fluorescent nanomaterials, but the full exploitation and application of their exceptional properties in the development of fluorescence assay are still rare. In this work, cationic carbon dots (C-CDs) covered with plenty of positive charges on the surface were synthesized through a facile ultrasonic method. Negatively charged hyaluronic acid (HA) caused the aggregation of positively charged C-CDs and neutral red (NR) along its linear chain via electrostatic adsorption, leading to a remarkable Förster resonance energy transfer (FRET) from C-CDs to NR...
July 28, 2017: Analytical Chemistry
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
#14
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
#15
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
#16
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
#17
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
#18
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
#19
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
#20
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
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