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https://www.readbyqxmd.com/read/28813564/multi-inducer-grouping-for-curve-completion-perceptual-and-computational-exploration
#1
Nir-Cohen Gal, Arad Boaz, Ben-Shahar Ohad
The human visual system excels in object recognition and scene interpretation even in scenes in which some (or even all) observed objects are partially occluded or fragmented. This highly efficient capacity is facilitated by constructive processes of contour completion between inducers to yield the perception of whole objects across gaps. A fundamental problem of the process is when and how the visual system groups different inducers in the visual scene between which completion occurs. Previous studies on this grouping problem, inspired mostly by relatability theory (Kellman & Shipley, 1991), focused on one good continuation condition that dictates whether a given pair of inducers would group together or not...
August 1, 2017: Journal of Vision
https://www.readbyqxmd.com/read/28813066/multivalent-mesoporous-silica-nanoparticles-photo-delivering-nitric-oxide-with-carbon-dots-as-fluorescence-reporters
#2
Damien Afonso, Sabrina Valetti, Aurore Fraix, Claudia Bascetta, Salvatore Petralia, Sabrina Conoci, Adam Feiler, Salvatore Sortino
Amino-terminated mesoporous silica nanoparticles embedding carbon dots (MSCD) formed by calcination were functionalized with a nitric oxide (NO) photodonor (1) to give a robust MSCD-1 conjugate. The intense fluorescence of MSCDs was strongly quenched in MSCD-1 by effective energy transfer. Visible light excitation of MSCD-1 liberates NO, suppresses the energy transfer mechanism and leads to concomitant fluorescence restoration of the MSCD scaffold, which acts as an optical reporter for the released NO. The MSCD-1 hybrid is also able to encapsulate the highly hydrophobic photosensitizer temoporfin, preserving the fluorescence reporting function...
August 16, 2017: Nanoscale
https://www.readbyqxmd.com/read/28812351/structural-investigation-of-cesium-lead-halide-perovskites-for-high-efficiency-quantum-dot-light-emitting-diodes
#3
Quyet Van Le, Jong Beom Kim, Soo Young Kim, Byeongdu Lee, Dong Ryeol Lee
In this study, we have intensively investigated the effect of the reaction temperature of hot-injection method on the structural properties of CsPbX3 (X: Br, I, Cl) perovskite nanocrystals (NCs) using the small- and wide-angle X-ray scattering. Furthermore, light emitting diodes (LEDs) performance as well as photoluminescence characteristics for high-efficient LEDs is compared with reaction temperature. It is confirmed that the size of the NCs decreased as the reaction temperature decreased, resulting stronger quantum confinement...
August 16, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28812332/live-cell-imaging-using-photoswitchable-diarylethene-doped-fluorescent-polymer-dots
#4
Yasuko Osakada, Tuyoshi Fukaminato, Yuma Ichinose, Mamoru Fujitsuka, Yoshie Harada, Tetsuro Majima
Fluorescence photoswitching using nanomaterials has recently emerged as a promising approach for the imaging of biological targets. However, despite intensive research efforts during the last decade, practical microscopy of biological targets using photoswitchable nanoparticles in real time remains challenging. To address this problem, we have developed live macrophage cell imaging and single particle imaging methods, using photoswitchable fluorescent diarylethene-doped polymer nanoparticles (P-dots) under Xe lamp irradiation...
August 15, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/28812307/the-development-of-perceptual-averaging-learning-what-to-do-not-just-how-to-do-it
#5
Pete R Jones, Tessa M Dekker
The mature visual system condenses complex scenes into simple summary statistics (e.g., average size, location, orientation, etc.). However, children, often perform poorly on perceptual averaging tasks. Children's difficulties are typically thought to represent the suboptimal implementation of an adult-like strategy. This paper examines another possibility: that children actually make decisions in a qualitatively different way to adults (optimal implementation of a non-ideal strategy). Ninety children (6-7, 8-9, 10-11 years) and 30 adults were asked to locate the middle of randomly generated dot-clouds...
August 15, 2017: Developmental Science
https://www.readbyqxmd.com/read/28811577/dirac-point-induced-ultralow-threshold-laser-and-giant-optoelectronic-quantum-oscillations-in-graphene-based-heterojunctions
#6
Golam Haider, Rini Ravindranath, Tzu-Pei Chen, Prathik Roy, Pradip Kumar Roy, Shu-Yi Cai, Huan-Tsung Chang, Yang-Fang Chen
The occurrence of zero effective mass of electrons at the vicinity of the Dirac point is expected to create new paradigms for scientific research and technological applications, but the related discoveries are rather limited. Here, we demonstrate that a simple architecture composed of graphene quantum dots sandwiched by graphene layers can exhibit several intriguing features, including the Dirac point induced ultralow-threshold laser, giant peak-to-valley ratio (PVR) with ultra-narrow spectra of negative differential resistance and quantum oscillations of current as well as light emission intensity...
August 15, 2017: Nature Communications
https://www.readbyqxmd.com/read/28811164/corrigendum-to-functional-quantum-dot-sirna-nanoplexes-to-regulate-chondrogenic-differentiation-of-mesenchymal-stem-cells-acta-biomater-46-2016-165-176
#7
Yang Wu, Bo Zhou, Fuben Xu, Xiaoyong Wang, Gang Liu, Li Zheng, Jinmin Zhao, Xingdong Zhang
No abstract text is available yet for this article.
August 12, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28811023/agnps-3d-nanostructure-enhanced-electrochemiluminescence-of-cdse-quantum-dot-coupled-with-strand-displacement-amplification-for-sensitive-biosensing-of-dna
#8
Meng Jiao, Guifen Jie, Lu Tan, Shuyan Niu
A novel strategy using Ag nanoparticles-3D (AgNPs-3D) nanostructure enhanced electrochemiluminescence (ECL) of CdSe quantum dots (QDs) coupled with strand displacement amplification (SDA) for sensitive biosensing of DNA was successfully designed. The prepared CdSe QDs with intense ECL were assembled on the poly (diallyldimethylammonium chloride) (PDDA) graphene oxide (GO) nanocomposites modified electrode, then gold nanoparticles (NPs) as the quenching probe was conjugated to the QDs, ECL signal was efficiently quenched...
August 29, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28810789/tunneling-lifetimes-of-electrons-escaping-from-atoms-under-a-static-electric-field
#9
Rundong Zhao, Yanoar Pribadi Sarwono, Rui-Qin Zhang
The tunneling lifetime of an electron escaping from an atom is calculated using a projected Green's function method, combining with the radial potential of the atom which is obtained from density functional theory. Results of the calculated electron tunneling lifetimes in model systems such as a quantum dot are shown to be comparable with other theoretical studies. For the first time, we have obtained the tunneling lifetimes of electrons escaping from a series of atoms (He, Ne, Ar, Kr, H, Li, Na, K) under a static electric field...
August 14, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28810342/-study-on-the-excavated-wooden-carved-acupuncture-statue-of-the-western-han-dynasty-in-laoguanshan
#10
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
#11
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/28810039/distinguishing-white-dot-syndromes-with-patterns-of-choroidal-hypoperfusion-on-optical-coherence-tomography-angiography
#12
Jay C Wang, Inês Laíns, Lucia Sobrin, John B Miller
BACKGROUND AND OBJECTIVE: To compare patterns of choroidal hypoperfusion in white dot syndromes (WDS) using optical coherence tomography angiography (OCTA). PATIENTS AND METHODS: Consecutive patients with WDS were imaged with either the Zeiss AngioPlex OCT Angiography (Carl Zeiss AG, Oberkochen, Germany) or the AngioVue OCT Angiography (Optovue, Fremont, CA) from February to November 2016. Four patients with acute posterior multifocal placoid pigment epitheliopathy (APMPPE), birdshot chorioretinopathy (BCR), presumed ocular histoplasmosis syndrome (POHS), and multiple evanescent white dot syndrome (MEWDS) were selected...
August 1, 2017: Ophthalmic Surgery, Lasers & Imaging Retina
https://www.readbyqxmd.com/read/28808350/fano-resonance-rabi-splitting-of-surface-plasmons
#13
Zhiguang Liu, Jiafang Li, Zhe Liu, Wuxia Li, Junjie Li, Changzhi Gu, Zhi-Yuan Li
Rabi splitting and Fano resonance are well-known physical phenomena in conventional quantum systems as atoms and quantum dots, arising from strong interaction between two quantum states. In recent years similar features have been observed in various nanophotonic and nanoplasmonic systems. Yet, realization of strong interaction between two or more Fano resonance states has not been accomplished either in quantum or in optical systems. Here we report the observation of Rabi splitting of two strongly coupled surface plasmon Fano resonance states in a three-dimensional plasmonic nanostructure consisting of vertical asymmetric split-ring resonators...
August 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28807648/not-all-visual-symmetry-is-equal-partially-distinct-neural-bases-for-vertical-and-horizontal-symmetry
#14
Zaira Cattaneo, Silvia Bona, Juha Silvanto
Visual mirror symmetry plays an important role in visual perception in both human and animal vision; its importance is reflected in the fact that it can be extracted automatically during early stages of visual processing. However, how this extraction is implemented at the cortical level remains an open question. Given the importance of symmetry in visual perception, one possibility is that there is a network which extracts all types of symmetry irrespective of axis of orientation; alternatively, symmetry along different axes might be encoded by different brain regions, implying that that there is no single neural mechanism for symmetry processing...
August 11, 2017: Neuropsychologia
https://www.readbyqxmd.com/read/28806699/a-portable-synthesis-of-water-soluble-carbon-dots-for-highly-sensitive-and-selective-detection-of-chlorogenic-acid-based-on-inner-filter-effect
#15
Huan Yang, Liu Yang, Yusheng Yuan, Shuang Pan, Jidong Yang, Jingjing Yan, Hui Zhang, Qianqian Sun, Xiaoli Hu
In this work, a simple and facile hydrothermal method for synthesis of water-soluble carbon dots (CDs) with malic acid and urea, and were then employed as a high-performance fluorescent probe for selective and sensitive determination of chlorogenic acid (CGA) based on inner filter effect. The as-synthesized CDs was systematically characterized by Transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), Energy disperse spectroscopy (EDS), UV-vis absorption spectroscopy, spectrofluorophotometry, and the results indicated that the sizes of CDs were mainly distributed in the range of 1...
August 1, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28806666/doxorubicin-loaded-environmentally-friendly-carbon-dots-as-a-novel-drug-delivery-system-for-nucleus-targeted-cancer-therapy
#16
Yifang Yuan, Bin Guo, Liying Hao, Na Liu, Yunfeng Lin, Wushuang Guo, Xiaoguang Li, Bin Gu
Chemotherapy is widely applied against various kinds of carcinoma. Generally, chemotherapeutic agents, such as Doxorubicin (DOX), Paclitaxel (PTX), 5-Fluorouracil (5-FU), Methotrexate (MTX), and Vinblastine (VLB) are combined with a view to maximizing their efficacy. Unfortunately, chemotherapeutics are indiscriminate and also kill normal healthy cells, resulting in serious side effects. This non-productive and destructive distribution of chemotherapeutics is regarded as one of the largest problems associated with chemotherapy...
July 10, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28806660/fluorescent-carbon-dot-gated-hollow-mesoporous-carbon-for-chemo-photothermal-synergistic-therapy
#17
Xiudan Wang, Yuanzhe Lin, Xian Li, Da Wang, Donghua Di, Qinfu Zhao, Siling Wang
An efficient and intelligent nano-carrier that combines cell imaging with near infrared (NIR) light and redox dual-responsive drug delivery was successfully prepared. The hollow mesoporous carbon (HMC) nanoparticles with high photothermal conversion ability were developed to increase the drug loading efficiency and realize chemotherapy and photothermal synergetic therapy. The photo-stable and luminescent carbon dots (CDs) were prepared from branched polyethyleneimine (PEI) by hydrothermal reaction. The PEI CDs (CDPEI) were grafted on the openings of HMC as the "gatekeepers" via disulfide units (HMC-SS-CDPEI) to prevent the premature release of doxorubicin (DOX)...
August 4, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28806526/highly-selective-self-powered-sensing-platform-for-p-nitrophenol-detection-constructed-with-a-photocathode-based-photocatalytic-fuel-cell
#18
Kai Yan, Yaohua Yang, Yuhan Zhu, Jingdong Zhang
A photocathode-based photocatalytic fuel cell (PFC) was fabricated and proposed as a self-powered sensor for p-nitrophenol (p-NP) detection. The PFC was comprised of a photocathode and an anode in separated chambers, which could generate suitable power output under photoirradiation to drive the sensing process. In this device, p-type PbS quantum dots-modified glass carbon electrode (GCE) served as the photocathode for the reduction of p-NP under photoirradiation while graphene-modified GCE was employed as the anode for the oxidation of ascorbic acid...
August 14, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28805860/synthesis-of-n-doped-graphene-quantum-dots-by-pulsed-laser-ablation-with-diethylenetriamine-deta-and-their-photoluminescence
#19
S R M Santiago, T N Lin, C H Chang, Y A Wong, C A J Lin, C T Yuan, J L Shen
We report a facile, fast, and one-step approach to prepare N-doped graphene quantum dots (GQDs) using pulsed laser ablation with diethylenetriamine (DETA). The synthesized N-doped GQDs with an average size of about 3.4 nm and an N/C atomic ratio of 26% have been demonstrated. Compared to pristine GQDs, the N-doped GQDs emit enhanced photoluminescence (PL) with a factor as high as 66, originated from the enhanced densities of pyridinic and graphitic N. The temperature-dependent PL of the N-doped GQDs was studied from cryogenic to room temperature...
August 14, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28805648/fabrication-of-highly-luminescent-and-concentrated-quantum-dot-poly-methyl-methacrylate-nanocomposites-by-matrix-free-methods
#20
Cheolsang Yoon, Hyo-Jun Kim, Myung-Hoon Kim, Kyusoon Shin, Young-Joo Kim, Kangtaek Lee
We present matrix-free methods for fabricating highly luminescent and transparent CdSe/ZnS quantum dot (QD)/polymer nanocomposites utilizing poly(methyl methacrylate) (PMMA)-grafted QDs with various molecular weights. We found that the QD-PMMA nanocomposites prepared by these matrix-free methods were superior to those prepared by a simple blending method in relation to their optical property, QD dispersion, and quantum efficiency. In particular, a matrix-free nanocomposite containing PMMA with a molecular weight of 2,000 had the highest quantum efficiency (52...
August 14, 2017: Nanotechnology
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