keyword
MENU ▼
Read by QxMD icon Read
search

Red dot

keyword
https://www.readbyqxmd.com/read/28227786/a-tunable-digital-ishihara-plate-for-pre-school-aged-children
#1
Orazio Gambino, Ester Minafo, Roberto Pirrone, Edoardo Ardizzone, Orazio Gambino, Ester Minafo, Roberto Pirrone, Edoardo Ardizzone, Ester Minafo, Edoardo Ardizzone, Roberto Pirrone, Orazio Gambino
Colors play a fundamental role for children, both in the everyday life and in education. They recognize the surrounding world, and play games making a large use of colors. They learn letters and numbers by means of colors. As a consequence, early diagnosis of color blindness is an crucial to support an individual affected by this visual perception alteration at the initial phase of his/her life. The diagnosis of red-green color deficiencies (protanopia or deuteranopia) is commonly accomplished by means of the Ishihara test, which consists of plates showing dots with different sizes where some of them compose numbers within a gamut of colors while the ones composing the background have different colors...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28224970/an-improved-p300-pattern-in-bci-to-catch-user-s-attention
#2
Jing Jin, Hanhan Zhang, Daly Ian, Xingyu Wang, Andrzej Cichocki
OBJECTIVE: Brain-computer interfaces (BCIs) can help patients who have lost control over most muscles but are still conscious and able to communicate or interact with the environment. One of the most popular types of BCI is the P300-based BCI. With this BCI, users are asked to count the number of appearances of target stimuli in an experiment. To date, the majority of visual P300-based BCI systems developed have used the same character or picture as the target for every stimulus presentation, which can bore users...
February 22, 2017: Journal of Neural Engineering
https://www.readbyqxmd.com/read/28219437/the-effect-of-a-test-ordering-software-intervention-on-the-prescription-of-unnecessary-laboratory-tests-a-randomized-controlled-trial
#3
Carlos Manuel Silva Martins, Andreia Sofia da Costa Teixeira, Luís Filipe Ribeiro de Azevedo, Luísa Maria Barbosa Sá, Paulo Alexandre Azevedo Pereira Santos, Maria Luciana Gomes Domingues do Couto, Altamiro Manuel Rodrigues da Costa Pereira, Alberto Augusto Oliveira Pinto Hespanhol, Cristina Maria Nogueira da Costa Santos
BACKGROUND: The way software for electronic health records and laboratory tests ordering systems are designed may influence physicians' prescription. A randomised controlled trial was performed to measure the impact of a diagnostic and laboratory tests ordering system software modification. METHODS: Participants were family physicians working and prescribing diagnostic and laboratory tests. The intervention group had a modified software with a basic shortcut menu changes, where some tests were withdrawn or added, and with the implementation of an evidence-based decision support based on United States Preventive Services Task Force (USPSTF) recommendations...
February 20, 2017: BMC Medical Informatics and Decision Making
https://www.readbyqxmd.com/read/28218505/theoretically-manipulating-quantum-dots-on-two-dimensional-2d-tio2-monolayer-for-effective-visible-light-absorption
#4
Ting Liao, Ziqi Sun, Shi Xue Dou
Low solar energy harvesting and conversion efficiency has become a major problem in solar energy science and engineering owing to the difficulty in capturing solar energy across the wide solar spectrum, especially in the visible light range. Inspired by the extraordinary properties of materials arising from decreased dimensions, in this study, we explore a nano-contact system formed by a two-dimensional (2D) TiO2 monolayer and II-VI semiconductor (CdX)13 (X = S, Se and Te) nanocages for engineering the visible light absorption...
February 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28211516/high-efficient-oled-displays-prepared-with-the-air-gapped-bridges-on-quantum-dot-patterns-for-optical-recycling
#5
Hyo-Jun Kim, Min-Ho Shin, Joo-Suc Kim, Se-Eun Kim, Young-Joo Kim
An optically efficient structure was proposed and fabricated to realize high brightness organic light emitting diode (OLED) displays based on a white OLED prepared with the air-gapped bridges on the quantum dot (QD) patterns. Compared with a conventional white OLED display, in our experiments, the optical intensity of the proposed OLED display shows the enhancement of 58.2% in the red color and 16.8% in the green color after applying the air-gapped bridge structure on QD patterns of 20 wt% concentration. This enhancement comes from the two facts that the QD patterns downconvert unnecessary blue or blue/green light to the required green or red light and the air-gapped bridges increase the color conversion efficiency of QDs by optical recycling using total internal reflection (TIR) at the interface...
February 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28208258/tuning-the-aggregation-disaggregation-behavior-of-graphene-quantum-dots-by-structure-switching-aptamer-for-high-sensitivity-fluorescent-ochratoxin-a-sensor
#6
Song Wang, Yajun Zhang, Guangsheng Pang, Yingwei Zhang, Shaojun Guo
The design of graphene quantum dots (GQDs)-aptamer bioconjugates as the new sensing platform is very important for developing high-sensitivity fluorescent biosensors; however, achieving new bioconjugates is still a great challenge. Herein, we report the development of a new high-sensitivity fluorescent aptasensor for the detection of ochratoxin A (OTA) based on tuning aggregation/disaggregation behavior of GQDs by structure-switching aptamers. The fluorescence sensing process for OTA detection involved two key steps: (1) cDNA-aptamer (cDNA, complementary to part of the OTA aptamer) hybridization induced the aggregation of GQD (fluorescence quenching) after cDNA was added into the GQDs-aptamer bioconjugate solution, and (2) the target of OTA triggered disaggregation of GQD aggregates (fluorescence recovery)...
February 7, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28196324/delivery-of-liposomal-quantum-dots-via-monocytes-for-imaging-of-inflamed-tissue
#7
Gil Aizik, Nir Waiskopf, Majd Agbaria, Yael Levi-Kalisman, Uri Banin, Gershon Golomb
Quantum dots (QDs), semiconductor nanocrystals, are fluorescent nanoparticles of growing interest as an imaging tool of a diseased tissue. However, a major concern is their biocompatibility, cytotoxicity, and fluorescence instability in biological milieu, impeding their use in biomedical applications, in general, and for inflammation imaging, in particular. In addition, for an efficient fluorescent signal at the desired tissue, and avoiding systemic biodistribution and possible toxicity, targeting is desired...
February 20, 2017: ACS Nano
https://www.readbyqxmd.com/read/28195097/phenotypic-expression-of-hbo-indonesia-in-two-indian-families-and-its-interaction-with-sickle-hemoglobin
#8
Amar Das Gupta, Anita Nadkarni, Pallavi Mehta, Manju Goriwale, Manisha Ramani, Pradnya Chaudhary, Vishal Mehrotra, Roshan Colah
BACKGROUND: Alpha globin chain variants are clinically significant since they directly influence the structure and function of the hemoglobin (Hb) molecules they constitute, either in combination with normal beta globin chains or with variant beta chains, thereby altering the morbidity and mortality associated with the resultant hemoglobinopathies. We describe here two unrelated families from Madhya Pradesh who had a nondeletional alpha-chain variant, HbO Indonesia (CD116 G → A). Members of one of the two families also had coinheritance of sickle hemoglobin (HbS)...
January 2017: Indian Journal of Pathology & Microbiology
https://www.readbyqxmd.com/read/28187898/vessel-segmentation-and-microaneurysm-detection-using-discriminative-dictionary-learning-and-sparse-representation
#9
Malihe Javidi, Hamid-Reza Pourreza, Ahad Harati
Diabetic retinopathy (DR) is a major cause of visual impairment, and the analysis of retinal image can assist patients to take action earlier when it is more likely to be effective. The accurate segmentation of blood vessels in the retinal image can diagnose DR directly. In this paper, a novel scheme for blood vessel segmentation based on discriminative dictionary learning (DDL) and sparse representation has been proposed. The proposed system yields a strong representation which contains the semantic concept of the image...
February 2017: Computer Methods and Programs in Biomedicine
https://www.readbyqxmd.com/read/28181166/red-light-emitting-diode-based-on-blue-ingan-chip-with-cdte-x-s-1%C3%A2-%C3%A2-x-quantum-dots
#10
Rongfang Wang, Xingming Wei, Liqin Qin, Zhihui Luo, Chunjie Liang, Guohang Tan
Thioglycolic acid-capped CdTe x S(1 - x) quantum dots (QDs) were synthesized through a one-step approach in an aqueous medium. The CdTe x S(1 - x) QDs played the role of a color conversion center. The structural and luminescent properties of the obtained CdTe x S(1 - x) QDs were investigated. The fabricated red light-emitting hybrid device with the CdTe x S(1 - x) QDs as the phosphor and a blue InGaN chip as the excitation source showed a good luminance. The Commission Internationale de L'Eclairage coordinates of the light-emitting diode (LED) at (0...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28177048/use-of-fluorescent-oligonucleotide-probes-for-differentiation-between-paracoccidioides-brasiliensis-and-paracoccidioides-lutzii-in-yeast-and-mycelial-phase
#11
Thales Domingos Arantes, Raquel Cordeiro Theodoro, Marcus de Melo Teixeira, Eduardo Bagagli
BACKGROUND: Fluorescence in situ hybridisation (FISH) associated with Tyramide Signal Amplification (TSA) using oligonucleotides labeled with non-radioactive fluorophores is a promising technique for detection and differentiation of fungal species in environmental or clinical samples, being suitable for microorganisms which are difficult or even impossible to culture. OBJECTIVE: In this study, we aimed to standardise an in situ hybridisation technique for the differentiation between the pathogenic species Paracoccidioides brasiliensis and Paracoccidioides lutzii, by using species-specific DNA probes targeting the internal transcribed spacer-1 (ITS-1) of the rRNA gene...
February 2017: Memórias do Instituto Oswaldo Cruz
https://www.readbyqxmd.com/read/28161779/interactions-of-amino-acids-with-aluminum-octacarboxyphthalocyanine-hydroxide-experimental-and-dft-studies
#12
Marta Kliber-Jasik, Małgorzata A Broda, Anna Maroń, Joanna Nackiewicz
The influence of albumin and amino acids (L-serine, glycine, L-histidine, L-tryptophan, L-cysteine) on the properties of aluminum octacarboxyphthalocyanine hydroxide (Al(OH)PcOC) was investigated in a phosphate buffer (pH 8.0). Particular attention was paid to the spectroscopic properties and photostability of Al(OH)PcOC. The effect of albumin or amino acids on the photodegradation of Al(OH)PcOC was examined in water using red light: 685 nm and daylight irradiation. Analysis of kinetic curves indicated that interaction with those molecules increases the photostability of Al(OH)PcOC...
February 2017: Journal of Molecular Modeling
https://www.readbyqxmd.com/read/28153811/cdte-quantum-dot-based-fluorescent-probes-for-selective-detection-of-hg-ii-the-effect-of-particle-size
#13
Jian Zhu, Zhu-Jun Zhao, Jian-Jun Li, Jun-Wu Zhao
Mercury ions-induced fluorescence quenching properties of CdTe quantum dots (QDs) have been studied using the fluorescence spectroscopic techniques. By using the hydrothermal method, the CdTe QDs with different particles sizes from 1.98 to 3.68nm have been prepared, and the corresponding fluorescence emission wavelength is changed from 518 to 620nm. The fluorescence of QDs is enhanced after linking Bovine serum albumin (BSA) onto the surface of the QDs. Experimental results show that the fluorescence intensity of BSA-coated CdTe QDs could be effectively quenched when Hg(2+) react with BSA-coated CdTe QDs...
January 27, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28128081/dermoscopic-findings-in-patients-with-pigmented-purpuric-dermatoses
#14
Seray Külcü Çakmak, Arzu Kılıç, Ahu Yorulmaz, Duru Onan, Derya Yayla, Ferda Artüz
Pigmented purpuric dermatoses (PPD) are a group of chronic and relapsing cutaneous disorders characterized by a distinct purpuric rash. The diagnosis is made with clinical and histopathological findings. Dermoscopy has rarely been used in the diagnosis of PPD. The aim of our study is to describe the dermoscopic findings in patients with PPD. Eighteen patients who were clinically and histopathologically diagnosed with PPD were studied prospectively. The type and duration of PPD, associated diseases, and medication history of the patients were noted...
December 2016: Acta Dermatovenerologica Croatica: ADC
https://www.readbyqxmd.com/read/28110520/characterizing-photon-reabsorption-in-quantum-dot-polymer-composites-for-use-as-displacement-sensors
#15
Matthew A Koc, Shilpa N Raja, Lindsey A Hanson, Son C Nguyen, Nicholas J Borys, Alexander S Powers, Siva Wu, Kaori Takano, Joseph K Swabeck, Jacob H Olshansky, Liwei Lin, Robert O Ritchie, A Paul Alivisatos
The reabsorption of photoluminescence within a medium, an effect known as the inner filter effect (IFE), has been well studied in solutions, but has garnered less attention in regards to solid-state nanocomposites. Photoluminescence from a quantum dot (QD) can selectively excite larger QDs around it resulting in a net red-shift in the reemitted photon. In CdSe/CdS core/shell QD-polymer nanocomposites we observe a large spectral red-shift of over a third of the linewidth of the photoluminescence of the nanocomposites over a distance of 100 μm resulting from the IFE...
January 22, 2017: ACS Nano
https://www.readbyqxmd.com/read/28107015/nonuniform-excitonic-charge-distribution-enhances-exciton-phonon-coupling-in-znse-cdse-alloyed-quantum-dots
#16
Ke Gong, David F Kelley, Anne Myers Kelley
Zinc to cadmium cation exchange of ZnSe quantum dots has been used to produce a series of alloyed Zn1-xCdxSe quantum dots. As x increases and the lowest-energy exciton shifts to the red, the peak initially broadens and then sharpens as x approaches 1. Resonance Raman spectra obtained with excitation near the lowest excitonic absorption peak show a gradual shift of the longitudinal optical phonon peak from 251 cm(-1) in pure ZnSe to 210 cm(-1) in nearly pure CdSe with strong broadening at intermediate compositions...
January 23, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28101854/impurity-location-dependent-relaxation-dynamics-of-cu-cds-quantum-dots
#17
Dayeon Choi, Ji-Young Pyo, Du-Jeon Jang
Various types of 2% Cu-incorporated CdS (Cu:CdS) quantum dots (QDs) with very similar sizes have been prepared via a water soluble colloidal method. The locations of Cu impurities in CdS host nanocrystals have been controlled by adopting three different synthetic ways of doping, exchange, and adsorption to understand the impurity location-dependent relaxation dynamics of charge carriers. The oxidation state of incorporated Cu impurities has been found to be +1 and the band-gap energy of Cu:CdS QDs decreases as Cu2S forms at the surfaces of CdS QDs...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28094404/excitation-wavelength-independent-visible-color-emission-of-carbon-dots
#18
Hua Wang, Chun Sun, Xingru Chen, Yu Zhang, Vicki L Colvin, Quinton Rice, Jaetae Seo, Shengyu Feng, Shengnian Wang, William W Yu
Carbon dots (CDs) usually emit a strong blue light and excitation wavelength dependent long wavelength lights. This significantly limits their applications because one has to use a series of different excitation light sources to get different colors and the long wavelength emissions are usually very weak. We found that one type of CDs synthesized from p-phenylenediamine could emit various long wavelength lights (green to red) independent of the excitation wavelength when dispersed in different solvents. The photoluminescence quantum yields of the same CDs were 10-35% in different solvents for different color emissions...
January 17, 2017: Nanoscale
https://www.readbyqxmd.com/read/28093904/supramolecular-polymer-dot-ensemble-for-ratiometric-detection-of-lectins-and-targeted-delivery-of-imaging-agents
#19
Chang-Zheng Wang, Jia-Li Chen, Ying Tang, Yi Zang, Guo-Rong Chen, Tony D James, Jia Li, Changfeng Wu, Xiao-Peng He
A supramolecular, polymer-dot-based ensemble has been developed for the ratiometric detection of lectins and targeted delivery of glycoprobes. Self-assembly between a blue-emitting polymer dot and a red-emitting glycoprobe, results in an ensemble that shows red emission upon excitation of the polymer dot because of Förster resonance energy transfer. Resulting in ratiometric detection of lectins in buffer solution as well as targeted delivery of the glycoprobe to cells that highly express a sugar receptor. Unlike conventional systems where both the agent and vector are codelivered intracellularly, our ensemble developed here shows a receptor-controlled dissociation on the cell membrane...
February 1, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28093297/bottom-up-synthesis-of-carbon-nanoparticles-with-higher-doxorubicin-efficacy
#20
Samer Bayda, Mohamad Hadla, Stefano Palazzolo, Vinit Kumar, Isabella Caligiuri, Emmanuele Ambrosi, Enrico Pontoglio, Marco Agostini, Tiziano Tuccinardi, Alvise Benedetti, Pietro Riello, Vincenzo Canzonieri, Giuseppe Corona, Giuseppe Toffoli, Flavio Rizzolio
Nanomedicine requires intelligent and non-toxic nanomaterials for real clinical applications. Carbon materials possess interesting properties but with some limitations due to toxic effects. Interest in carbon nanoparticles (CNPs) is increasing because they are considered green materials with tunable optical properties, overcoming the problem of toxicity associated with quantum dots or nanocrystals, and can be utilized as smart drug delivery systems. Using black tea as a raw material, we synthesized CNPs with a narrow size distribution, tunable optical properties covering visible to deep red absorption, non-toxicity and easy synthesis for large-scale production...
January 14, 2017: Journal of Controlled Release: Official Journal of the Controlled Release Society
keyword
keyword
51644
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"