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Red dot

Tianyi Zhang, Feifei Zhao, Li Li, Bin Qi, Dongxia Zhu, Jianhua Lü, Changli Lü
The past few years have witnessed the rapid development of carbon dots (CDs) due to their outstanding optical properties and a wide range of applications. However, the design and control of CDs with long-wavelength and multicolor emission are still huge challenges to be addressed for their practical use in different fields. Here, novel nitrogen doped multiple-cores@shell structured CDs with tricolor emissions of red, green and blue were constructed via one pot hydrothermal method from citric acid (CA) and 5-amino-1,10-phenanthroline (Aphen) as reactants and the growth process of CDs was monitored with the reaction time in the synthetic system...
May 24, 2018: ACS Applied Materials & Interfaces
Hesheng Victor Xu, Xinting Zheng, Yanli Zhao, Yen Nee Tan
Natural amino acids possess side chains with different functional groups (R groups), which make them excellent precursors for programmable synthesis of biomolecule-derived nanodots (bio-dots) with desired properties. Herein, we reported the first systematic study to uncover the material design rules of bio-dots synthesis from 20 natural α-amino acids via a green hydrothermal approach. The as-synthesized amino acids bio-dots (AA-dots) are comprehensively characterised to establish a structure-properties relationship between the amino acid precursors and the corresponding photoluminescent properties of AA-dots...
May 22, 2018: ACS Applied Materials & Interfaces
Fernanda S Resende, Claudio Conforti, Roberta Giuffrida, Mayara Hamilko de Barros, Iris Zalaudek
Vulvar melanoma is a rare and deadly cancer in women, and the prognosis is often poor. There are limited studies on the dermoscopic features of vulvar melanoma. Described criteria include the presence of blue, gray, or white colors. Herein we present the clinical and dermoscopic characteristics of a hypopigmented and heavily pigmented nodule in a 92-year-old and an 80-year-old woman. Dermoscopy in the former revealed structureless milky-red to white areas, remnants of brown pigmentation at the base and polymorphic vessels, while the latter displayed structureless blue-gray areas with black dots and peripheral lines at the base...
April 2018: Dermatology Practical & Conceptual
Matthias Bock, Pascal Eich, Stephan Kucera, Matthias Kreis, Andreas Lenhard, Christoph Becher, Jürgen Eschner
Entanglement between a stationary quantum system and a flying qubit is an essential ingredient of a quantum-repeater network. It has been demonstrated for trapped ions, trapped atoms, color centers in diamond, or quantum dots. These systems have transition wavelengths in the blue, red or near-infrared spectral regions, whereas long-range fiber-communication requires wavelengths in the low-loss, low-dispersion telecom regime. A proven tool to interconnect flying qubits at visible/NIR wavelengths to the telecom bands is quantum frequency conversion...
May 21, 2018: Nature Communications
Deepak Kumar Khajuria, Vijay Bhooshan Kumar, Dana Gigi, Aharon Gedanken, David Karasik
We investigated the osteogenic potential of nitrogen doped carbon dots (NCDs) conjugated with hydroxyapatite (HA) nanoparticles on the MC3T3-E1 osteoblast cell functions and in a zebrafish (ZF) jaw bone regeneration (JBR) model. The NCDs-HA nanoparticles were fabricated by hydrothermal cum co-precipitation technique. The surface structures of NCDs-HA nanoparticles were characterized by XRD, FTIR, UV-Vis, and laser fluorescent spectroscopy, SEM, TEM, EDS, and NMR analysis. The TEM data confirmed that the NCDs are well conjugated on the HA nanoparticle surfaces...
May 21, 2018: ACS Applied Materials & Interfaces
Juan Hu, Ming-Hao Liu, Chun-Yang Zhang
MicroRNAs (miRNAs) are small non-coding RNAs that regulate important physiological processes, and their dysregulation is associated with various human diseases. Simultaneous sensitive detection of multiple miRNAs may facilitate early clinical diagnosis. In this research, we demonstrate for the first time the integration of hyperbranched rolling circle amplification (HRCA) with quantum dot (QD)-based fluorescence resonance energy transfer (FRET) for the simultaneous detection of multiple microRNAs with a single-color QD as the donor and two fluorescent dyes as the acceptors...
May 14, 2018: Chemical Science
Anatolie Baltatescu, Elio Striglia, Marina Trento, Aurora Mazzeo, Franco Cavallo, Lorena Charrier, Massimo Porta
PURPOSE: Detection of microaneurysms and/or microhaemorrhages near the fovea when screening for diabetic retinopathy poses a problem because referral to retinal specialists may alarm patients and unnecessarily burden ophthalmologists. METHODS: Six-month prospective study of patients found to have minimal red lesions within one disc diameter of the fovea when screened for diabetic retinopathy. Two 45° digital photographs, one centred on the macula and the other nasal including the optic disc, were taken for each eye...
May 1, 2018: Diabetes & Vascular Disease Research
Changjian Li, Yueqi Wang, Xiaojie Zhang, Xueling Guo, Xiaoxuan Kang, Libo Du, Yang Liu
Carbon dots have attracted considerable attention in the field of biosensors and bioimaging because of their excellent optical performance and low toxicity. However, the cellular uptake of the reported carbon dots generally has a low efficiency, which limits their practical applications. In this study, we reported a novel red fluorescent sulfur and nitrogen co-doped carbon dots with small molecular phenylboronic acid tags (i.e. S, N-CDs-PBA). The S, N-CDs-PBA can be taken up rapidly by PC12 cells in twenty minutes and showed high sensitivity for the detection of Fe3+ ions...
May 9, 2018: Journal of Colloid and Interface Science
Jixin Chen, Ye Li, Le Wang, Tianliang Zhou, Rong-Jun Xie
Semiconductor quantum dots (QDs) are promising luminescent materials for use in lighting, display and bio-imaging, and the color tuning is a necessity for such applications. In this work, we report tunable colors and deep-red or near infrared (NIR) emissions in Cu-In-S and Cu-In-S/ZnS QDs by incorporating Sn. These QDs (with a size of 5 nm) with varying Sn concentrations and/or Cu/In ratios were synthesized by a non-injection method, and characterized by a variety of analytical techniques (i.e., XRD, TEM, XPS, absorption, photoluminescence, decay time, etc...
May 16, 2018: Nanoscale
Ariadna Arbiol-Roca, Claudia Elizabeth Imperiali, Magdalena Macià Montserrat, Ana Sancho Cerro, Anna Cortés Bosch de Basea, Lourdes Sánchez Navarro, Dolors Dot Bach, José Valero Politi
Background: The examination of peripheral blood is routinely used as a basic test in daily medical practice. Reliable reference intervals are necessary to avoid misdiagnoses, and the establishment of those intervals is an important task for clinical laboratories.The aim of the present study was to establish the reference intervals for complete blood count (CBC) on a Sysmex XN haematology analyser in healthy adults from the southern metropolitan area of Barcelona (Spain). Methods: A total of 213 apparently healthy adults who received a general health examination at Hospital Universitari de Bellvitge were recruited to this study...
April 2018: EJIFCC
Hiroki Hoshino, Takuya Okada, Motoharu Matsuura
A photonic analog-to-digital conversion (PADC) based on intensity-to-frequency conversion using a frequency chirp in a semiconductor optical amplifier (SOA) is proposed. The presented PADC has a simple scheme whereby optical quantization is achieved using a single SOA with multiple rectangular bandpass filters placed in parallel. In this Letter, we successfully achieve 10  GSamples/s, eight-level optical quantization using a quantum-dot SOA. The PADC also has much lower input signal pulse power requirements for optical quantization, compared with conventional PADCs...
May 15, 2018: Optics Letters
Mingda Zheng, Chenge Wang, Yingying Wang, Wei Wei, Shuang Ma, Xiaohan Sun, Jiang He
In this work, Lycii Fructus as raw materials for green synthesis of fluorescent carbon dots (CDs) reduce AgNO3 . The CDs-AgNPs were synthesized by one-step method. CDs were applied to stabilize AgNPs due to abundant functional groups on the surface of CDs. In presence of phoxim, the dispersed CDs-AgNPs get aggregated and the absorption peak with red shift from 400 nm to 525 nm, resulting in the color changed from yellow to red. Under optimized conditions, the absorbance ratio at A525 nm /A400 nm was related linearly to the concentrations of phoxim in the range of 0...
August 1, 2018: Talanta
Qingyan Jia, Xiuli Zheng, Jiechao Ge, Weimin Liu, Haohui Ren, Shiqing Chen, Yongmei Wen, Hongyan Zhang, Jiasheng Wu, Pengfei Wang
As phototheranostic agents, carbon dots (CDs), have recently drawn considerable attention due to their excellent physicochemical properties. However, the complex synthetic route and high-cost of CDs greatly limit their practical application. To address this issue, given their nearly infinite supply from nature, Hypocrella bambusae is used as the precursor for the preparation of CDs in this study. The obtained Hypocrella bambusae CDs (HBCDs) possess good water solubility, broad absorption (350-800 nm), red-light emission (maximum peak at 610 nm), and low biotoxicity...
May 4, 2018: Journal of Colloid and Interface Science
Penghui He, CongBiao Jiang, Linfeng Lan, Sheng Sun, Yuzhi Li, Peixiong Gao, Peng Zhang, Xingqiang Dai, Jian Wang, Junbiao Peng, Yong Cao
Light-emitting filed-effect transistors (LEFETs) have attained great attention due to its special characteristic with both of the switching capacity and the electroluminescence capacity. However, high performance LEFETs with high mobility, high brightness and high efficiency have not been realized due to the difficulty in developing high electron and hole mobility materials with suitable band structures. In this paper, quantum-dot hybrid LEFETs (QD-HLEFETs) combined high luminous-efficiency quantum dots (QDs) and solution-processed scandium-incorporated indium oxide (Sc:In2O3) semiconductor were demonstrated...
May 9, 2018: ACS Nano
Wei Qin, Pengfei Zhang, Hui Li, Jacky W Y Lam, Yuanjing Cai, Ryan T K Kwok, Jun Qian, Wei Zheng, Ben Zhong Tang
Reported here is a successful strategy for the design of ultrabright red luminogens with aggregation-induced emission (AIE) features, donor-acceptor structures, and intense charge transfer effects. These luminogens show no aggregation caused emission quenching in the solid state and have high quantum efficiency. They can be fabricated into AIE dots by a simple nanoprecipitation procedure. The AIE dots exhibit high brightness, a large Stokes shift, good biocompatibility, satisfactory photostability, and a high two-photon absorption cross section...
March 14, 2018: Chemical Science
Margarita Kurochkina, Elena Konshina, Aleksandr Oseev, Soeren Hirsch
Background: The luminescence amplification of semiconductor quantum dots (QD) in the presence of self-assembled gold nanoparticles (Au NPs) is one of way for creating biosensors with highly efficient transduction. Aims: The objective of this study was to fabricate the hybrid structures based on semiconductor CdSe/ZnS QDs and Au NP arrays and to use them as biosensors of protein. Methods: In this paper, the hybrid structures based on CdSe/ZnS QDs and Au NP arrays were fabricated using spin coating processes...
2018: Nanotechnology, Science and Applications
Оlena О Оshyvalova
OBJECTIVE: Introduction: Dermatologists of many foreign countries have been successfully using and developing dermatoscopy as a method of early diagnosis of skin tumors for three decades. It is believed that the vascular dermatoscopiccomponent is a promising criterion for the diagnosis of epidermal dysplasia of the skin and can be used for differential diagnosis. The aim of the work was to study the features of the vascular dermatoscopic component in actinic keratosis (AK), non-invasive (squamous cell carcinoma in situ-SCCis) and invasive forms of squamous cell carcinoma (cSCC)...
2018: Wiadomości Lekarskie: Organ Polskiego Towarzystwa Lekarskiego
Umberto Giovanella, Mariacecilia Pasini, Monica Lorenzon, Francesco Galeotti, Claudio Lucchi, Francesco Meinardi, Silvia Luzzati, Benoit Dubertret, Sergio Brovelli
Colloidal nanoplatelets (NPLs), owning to their efficient, narrowband luminescence, are considered promising candidates for solution-processable light-emitting diodes (LEDs) with ultra-high color purity. To date, however, the record efficiencies of NPLs-LED are significantly lower than more investigated devices based on spherical nanocrystals. This is particularly true for red-emitting NPL-LEDs, whose best reported EQE is limited to 0.63% (EQE=5% for green NPL-LEDs). Here, we address this issue by introducing a charge regulating layer of a polar/polyelectrolytic polymer specifically engineered with complementary trimethylammonium and phosphonate functionalities that provide high solubility in orthogonal polar media with respect to the NPL active layer, compatibility with the metal cathode and the ability to control electron injection through the formation of a polarized interface under bias...
May 3, 2018: Nano Letters
Hui Ding, Ji-Shi Wei, Peng Zhang, Zi-Yuan Zhou, Qing-Yu Gao, Huan-Ming Xiong
Carbon dots (CDs) have tremendous potential applications in bioimaging, biomedicine, and optoelectronics. By far, it is still difficult to produce photoluminescence (PL) tunable CDs with high quantum yield (QY) across the entire visible spectrum and narrow the emission peak widths of CDs close to those of typical quantum dots. In this work, a series of CDs with tunable emission from 443 to 745 nm, quantum yield within 13-54%, and narrowed full width at half maximum (FWHM) from 108 to 55 nm, are obtained by only adjusting the reaction solvents in a one-pot solvothermal route...
April 30, 2018: Small
Andrew Murphy, Michael Neep
INTRODUCTION: A Radiographer Abnormality Detection System (RADS), such as the 'red dot system', involves radiographers highlighting the presence of potential acute abnormalities on radiographs in the emergency setting. The literature suggests little additional training is required of radiographers to participate in such a system, posing little impact on current workflow while remaining a cost-effective, easy-to-implement program. However, its use outside the United Kingdom is sporadic...
April 29, 2018: Journal of Medical Radiation Sciences
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