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https://www.readbyqxmd.com/read/28345705/activating-efficient-room-temperature-phosphorescence-of-carbon-dots-by-synergism-of-orderly-non-noble-metals-and-dual-structural-confinements
#1
Li Qian Bai, Ning Xue, Xin Rui Wang, Wen Ying Shi, Chao Lu
Obtaining high efficiency room temperature phosphorescence (RTP) by employing non-noble metals poses two challenges: (1) strengthening spin-orbit coupling of excitons to improve the rate of intersystem crossing (ISC) by using non-noble metals with small-atomic-number; (2) employing structural confinement to enhance radiation relaxation because harsh conditions, including carefully selected matrices, rigid solid-state crystalline structure and low temperature, are commonly needed. Here, layered double hydroxides (LDHs) with orderly non-noble metal arrangements were used as an inorganic matrix to activate RTP of carbon dots (CDs)...
March 27, 2017: Nanoscale
https://www.readbyqxmd.com/read/28345273/tuning-hole-and-electron-transfer-from-photo-excited-cdse-quantum-dot-to-phenol-derivatives-effect-of-electron-donating-and-withdrawing-moiety
#2
Hirendra Nath Ghosh, Tushar Debnath, Deepa Sebastian, Sourav Maiti
Charge transfer processes from photo-excited CdSe QDs to phenol derivatives with electron donating (4-methoxy) and electron withdrawing (4-nitro) moiety have been demonstrated by using steady state and time-resolved emission and femto-second transient absorption spectroscopy. Steady state and time-resolved emission studies suggest that in presence of both 4-nitro phenol (4NP) and 4-methoxy phenol (4MP) CdSe QDs luminescence gets quenched. Stern-Volmer analysis suggests both static and dynamic mechanisms are active for both the QD/phenol composites...
March 27, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28343103/pd-au-carbon-dots-nanocomposite-facile-synthesis-and-application-as-an-ultrasensitive-electrochemical-biosensor-for-determination-of-colitoxin-dna-in-human-serum
#3
Qitong Huang, Xiaofeng Lin, Jie-Ji Zhu, Qing-Xiao Tong
In this study, a green and fast method was developed to synthesize high-yield carbon dots (CDs) via one-pot microwave treatment of banana peels without using any other surface passivation agents. Then the as-prepared CDs was used as the reducing agent and stabilizer to synthesize a Pd-Au@CDs nanocomposite by a simple sequential reduction strategy. Finally, Pd-Au@CDs nanocomposite modified glassy carbon electrode (Pd-Au@CDs/GCE) was obtained as a biosensor for target DNA after being immobilized a single-stranded probe DNA by a carboxyl ammonia condensation reaction...
March 22, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28341799/use-of-traumatic-brain-injury-prediction-rules-with-clinical-decision-support
#4
Peter S Dayan, Dustin W Ballard, Eric Tham, Jeff M Hoffman, Marguerite Swietlik, Sara J Deakyne, Evaline A Alessandrini, Leah Tzimenatos, Lalit Bajaj, David R Vinson, Dustin G Mark, Steve R Offerman, Uli K Chettipally, Marilyn D Paterno, Molly H Schaeffer, Jun Wang, T Charles Casper, Howard S Goldberg, Robert W Grundmeier, Nathan Kuppermann
OBJECTIVES: We determined whether implementing the Pediatric Emergency Care Applied Research Network (PECARN) traumatic brain injury (TBI) prediction rules and providing risks of clinically important TBIs (ciTBIs) with computerized clinical decision support (CDS) reduces computed tomography (CT) use for children with minor head trauma. METHODS: Nonrandomized trial with concurrent controls at 5 pediatric emergency departments (PEDs) and 8 general EDs (GEDs) between November 2011 and June 2014...
March 24, 2017: Pediatrics
https://www.readbyqxmd.com/read/28340948/application-of-ultrasound-aided-method-for-the-synthesis-of-cds-incorporated-three-dimensional-tio2-photocatalysts-with-enhanced-performance
#5
Joon Yeob Lee, Wan-Kuen Jo
In this study, an ultrasound-aided hydrothermal-impregnation method was used to synthesize three-dimensional (3D) urchin-like CdS-TiO2 nanostructures (UCTs) with variable CdS content. The photocatalytic efficiencies (for degrading limonene and toluene vapor) of UCTs synthesized using the ultrasound-aided process were greater than those of UCTs fabricated without ultrasound treatment. In addition, the photocatalytic efficiencies of ultrasound-treated UCTs were greater than those of zero-dimensional ultrasound-treated CdS-TiO2 particles, which, in turn, were greater than those of untreated 3D TiO2...
March 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28340728/ferrocene-graphene-sheets-for-high-efficiency-quenching-of-electrochemiluminescence-from-au-nanoparticles-functionalized-cadmium-sulfide-flower-like-three-dimensional-assemblies-and-sensitive-detection-of-prostate-specific-antigen
#6
Jiu-Jun Yang, Jun-Tao Cao, Hui Wang, Yan-Ming Liu, Shu-Wei Ren
A signal-switchable electrochemiluminescence (ECL) aptasensor was presented for sensitive prostate specific antigen (PSA) assay using ferrocene-graphene sheets (Fc-GNs) for high-efficiency quenching of ECL from Au nanoparticles functionalized cadmium sulfide flower-like three dimensional (3D) assemblies (Au-CdS flower-like 3D assemblies). Au-CdS flower-like 3D assemblies were synthesized and employed as luminophore, exhibiting strong and stable ECL intensity, and followed by assembling captured DNA (cDNA) and hybridizing it with half of base sequence of PSA aptamer on the Au-CdS flower-like 3D assemblies modified electrode...
May 15, 2017: Talanta
https://www.readbyqxmd.com/read/28340317/opportunities-for-crash-and-injury-reduction-a-multi-harm-approach-for-crash-data-analysis
#7
Ann Mallory, Allison Kender, Kevin Moorhouse
OBJECTIVE: A multi-harm approach for analyzing crash and injury data was developed for the ultimate purpose of getting a richer picture of motor vehicle crash outcomes identifying research opportunities in crash safety. METHODS: Methods were illustrated using a retrospective analysis of 69,597 occupant cases from NASS CDS (National Automotive Sampling System Crashworthiness Data System) from 2005 to 2015. Occupant cases were analyzed by frequency and severity of outcome: fatality, injury by AIS (Abbreviated Injury Scale), number of cases, attributable fatality, disability, and injury costs...
March 24, 2017: Traffic Injury Prevention
https://www.readbyqxmd.com/read/28339692/decrease-in-unnecessary-vitamin-d-testing-using-clinical-decision-support-tools-making-it-harder-to-do-the-wrong-thing
#8
Andrew H Felcher, Rachel Gold, David M Mosen, Ashley B Stoneburner
Objective: To evaluate the impact of clinical decision support (CDS) tools on rates of vitamin D testing. Screening for vitamin D deficiency has increased in recent years, spurred by studies suggesting vitamin D's clinical benefits. Such screening, however, is often unsupported by evidence and can incur unnecessary costs. Materials and Methods: We evaluated how rates of vitamin D screening changed after we implemented 3 CDS tools in the electronic health record (EHR) of a large health plan: (1) a new vitamin D screening guideline, (2) an alert that requires clinician acknowledgement of current guidelines to continue ordering the test (a "hard stop"), and (3) a modification of laboratory ordering preference lists that eliminates shortcuts...
February 19, 2017: Journal of the American Medical Informatics Association: JAMIA
https://www.readbyqxmd.com/read/28339185/red-emission-b-n-s-co-doped-carbon-dots-for-colorimetric-and-fluorescent-dual-mode-detection-of-fe3-ions-in-complex-biological-fluids-and-living-cells
#9
Yinghua Liu, Wenxiu Duan, Wei Song, Juanjuan Liu, Cuiling Ren, Jiang Wu, Dan Liu, Hongli Chen
Colorimetric and fluorescent dual mode detection methods have gained much attention in recent years, however, it is still desirable to develop new colorimetric and fluorescent dual mode nanosensors with more simple preparation procedure, low cost and excellent biocompatibility. Herein, a colorimetric and fluorescent nanosensor based on B, N, S-co-doped carbon dots (BNS-CDs) were synthesized by one-step hydrothermal treatment of 2, 5-diaminobenzenesulfonic acid and 4-aminophenylboronic acid hydrochloride. Using this nanosensor, a highly sensitive assay of Fe3+ in the range of 0...
March 24, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28339123/desolution-of-cd-and-cb-macrocycles
#10
Jade A McCune, Susanna Kunz, Magdalena Olesińska, Oren A Scherman
Supramolecular chemistry utilizing the macrocyclic hosts cyclodextrins (CDs) and cucurbit[n]urils (CB[n]s) is traditionally carried out in aqueous media, however, their solubility is typically poor, especially the family of cucurbit[n]urils. Through derivitization of these macrocycles their solubility can be augmented to enable enhanced solubility in water and in some organic solvents. The increase in solubility of these derivitized macrocycles allows for their use in a wider range of chemical environments and giving rise to myriad potential applications...
March 24, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28337413/draft-genome-sequence-of-thermoanaerobacterium-sp-strain-psu-2-isolated-from-thermophilic-hydrogen-producing-reactor
#11
Sompong O-Thong, Peerawat Khongkliang, Chonticha Mamimin, Apinya Singkhala, Poonsuk Prasertsan, Nils-Kåre Birkeland
Thermoanaerobacterium sp. strain PSU-2 was isolated from thermophilic hydrogen producing reactor and subjected to draft genome sequencing on 454 pyrosequencing and annotated on RAST. The draft genome sequence of strain PSU-2 contains 2,552,497 bases with an estimated G + C content of 35.2%, 2555 CDS, 8 rRNAs and 57 tRNAs. The strain had a number of genes responsible for carbohydrates metabolic, amino acids and derivatives, and protein metabolism of 17.7%, 14.39% and 9.81%, respectively. Strain PSU-2 also had gene responsible for hydrogen biosynthesis as well as the genes related to Ni-Fe hydrogenase...
June 2017: Genomics Data
https://www.readbyqxmd.com/read/28335339/electrochemical-and-capacitive-properties-of-carbon-dots-reduced-graphene-oxide-supercapacitors
#12
Yong-Qiang Dang, Shao-Zhao Ren, Guoyang Liu, Jiangtao Cai, Yating Zhang, Jieshan Qiu
There is much recent interest in graphene-based composite electrode materials because of their excellent mechanical strengths, high electron mobilities, and large specific surface areas. These materials are good candidates for applications in supercapacitors. In this work, a new graphene-based electrode material for supercapacitors was fabricated by anchoring carbon dots (CDs) on reduced graphene oxide (rGO). The capacitive properties of electrodes in aqueous electrolytes were systematically studied by galvanostatic charge-discharge measurements, cyclic voltammetry, and electrochemical impedance spectroscopy...
November 14, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28335292/a-tunable-photoluminescent-composite-of-cellulose-nanofibrils-and-cds-quantum-dots
#13
Qinwen Wang, Aimin Tang, Yuan Liu, Zhiqiang Fang, Shiyu Fu
The preparation of fluorescent nanocomposite materials with tunable emission wavelengths by combining cellulose nanofibrils (CNFs) with inorganic nanoparticles is important for promoting CNFs applications. A CNF/CdS nanocomposite was prepared via in situ compositing at room temperature on oxidized CNFs with CdS quantum dots. By controlling the -COOH/Cd(2+) ratio on the CNF, the feeding time of Na₂S and the ultrasonic maturing time, the size of the CdS quantum dots on the CNF surface could be adjusted so that to obtain the CNF/CdS nanocomposite material with different fluorescent colors...
September 7, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28335226/improving-the-photocurrent-in-quantum-dot-sensitized-solar-cells-by-employing-alloy-pbxcd1-xs-quantum-dots-as-photosensitizers
#14
Chunze Yuan, Lin Li, Jing Huang, Zhijun Ning, Licheng Sun, Hans Ågren
Ternary alloy PbxCd1-xS quantum dots (QDs) were explored as photosensitizers for quantum-dot-sensitized solar cells (QDSCs). Alloy PbxCd1-xS QDs (Pb0.54Cd0.46S, Pb0.31Cd0.69S, and Pb0.24Cd0.76S) were found to substantially improve the photocurrent of the solar cells compared to the single CdS or PbS QDs. Moreover, it was found that the photocurrent increases and the photovoltage decreases when the ratio of Pb in PbxCd1-xS is increased. Without surface protecting layer deposition, the highest short-circuit current density reaches 20 mA/cm² under simulated AM 1...
May 25, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28334660/preparation-and-photovoltaic-properties-of-cds-quantum-dot-sensitized-solar-cell-based-on-zinc-tin-mixed-metal-oxides
#15
Jiupeng Cao, Yifan Zhao, Yatong Zhu, Xiaoyu Yang, Peng Shi, Hongdi Xiao, Na Du, Wanguo Hou, Genggeng Qi, Jianqiang Liu
The present study reports a new type of quantum dot sensitized solar cells (QDSSCs) using the zinc tin mixed metal oxides (MMO) as the anode materials, which were obtained from the layered double hydroxide (LDH) precursor. The successive ionic layer adsorption and reaction (SILAR) method is applied to deposit CdS quantum dots. The effects of sensitizing cycles on the performance of CdS QDSSC are studied. Scanning electron microscopy (SEM), Transmission electron microscope (TEM) and X-ray diffraction (XRD) are used to identify the surface profile and crystal structure of the mixed metal oxides anode...
March 16, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28332855/occupant-to-occupant-contact-injury-in-motor-vehicle-crashes
#16
David C Viano, Chantal S Parenteau
OBJECTIVE: This is a descriptive study of the frequency and risk of occupant-to-occupant contact injury by crash type and occupant age. It focused on rear impacts because of a recent Senate inquiry. METHODS: 1994-2013 NASS-CDS data was used to investigate the effects of occupant-to-occupant contact on the risk of serious-to-fatal injury (AIS 3+) by crash type and age group. NASS-CDS in-depth cases were analyzed to identify crash circumstances for AIS 3+ occupant-to-occupant contact injury in rear crashes...
March 23, 2017: Traffic Injury Prevention
https://www.readbyqxmd.com/read/28328068/separation-of-enilconazole-enantiomers-in-capillary-electrophoresis-with-cyclodextrin-type-chiral-selectors-and-investigation-of-structure-of-selector-selectand-complexes-by-using-nuclear-magnetic-resonance-spectroscopy
#17
Ann Gogolashvili, Elene Tatunashvili, Lali Chankvetadze, Tamas Sohajda, Julianna Szeman, Antonio Salgado, Bezhan Chankvetadze
In the present study the enantiomer migration order (EMO) of enilconazole in the presence of various cyclodextrins (CDs) was investigated by capillary electrophoresis (CE). Opposite EMO of enilconazole were observed when β-CD or the sulfated heptakis(2-O-methyl-3,6-di-O-sulfo)-β-CD (HMDS-β-CD) was used as the chiral selectors. Nuclear Magnetic Resonance (NMR) spectroscopy was used to study the mechanism of chiral recognition between enilconazole enantiomers and those two cyclodextrins. On the basis of rotating frame nuclear Overhauser (ROESY) experiments, the structure of an inclusion complex between enilconazole and β-CD was derived, in which (+)-enilconazole seemed to form a tighter complex than the (-)-enantiomer...
March 22, 2017: Electrophoresis
https://www.readbyqxmd.com/read/28327734/band-edge-oscillator-strength-of-colloidal-cdse-cds-dot-in-rods-comparison-of-absorption-and-time-resolved-fluorescence-spectroscopy
#18
I Angeloni, W Raja, A Polovitsyn, F De Donato, R Proietti Zaccaria, I Moreels
We studied the oscillator strength fgap of the band gap transition in heteronanocrystals (hNCs) with a spherical CdSe core embedded in an elongated CdS shell. A comparison with fgap of core-only CdSe NCs confirmed a reduction of the electron-hole overlap in hNCs with a band gap larger than 2.05 eV or smaller than 1.98 eV. However, the decrease in fgap is limited to about 50% when compared to CdSe NCs, suggesting that residual confinement still localizes the electron near the core. We correlated fgap with the radiative lifetime obtained from multiexponential photoluminescence (PL) decay traces...
March 22, 2017: Nanoscale
https://www.readbyqxmd.com/read/28327652/a-facile-ultrasonic-assisted-fabrication-of-nitrogen-doped-carbon-dots-biobr-up-conversion-nanocomposites-for-visible-light-photocatalytic-enhancements
#19
Yifan Zhang, Mira Park, Hak Yong Kim, Bin Ding, Soo-Jin Park
A highly efficient novel photocatalyst consisting of nitrogen-carbon dots (N-CDs) and three-dimensional (3D) hierarchical BiOBr was synthesized via a simple ultrasonic-assisted method and used for the degradation of hazardous dyes. Deposition of N-CDs onto the surface of BiOBr was confirmed through structure and composition characterizations. The N-CDs/BiOBr composites exhibited superior activity for organic contaminant degradation under visible light and the 1 wt% N-CDs/BiOBr composite showed the highest degradation rate, indicating that N-CDs/BiOBr composites have great potential for application in mitigating hazardous contaminants...
March 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28322097/association-between-ascending-aortic-diameter-and-coronary-artery-dilation-a-demographic-data-analysis
#20
Ali Can Hatemi, Aybala Tongut, Zeki Özyedek, İsmail Çerezci, İlhan Özgöl, Hande Perk Gürün
Objective Coronary artery dilations (CDs), a subgroup of coronary artery anomalies (CAAs), are relatively rare but important cardiac pathologies. They are considered to be linked to coronary atherosclerosis in most cases. Methods The demographic data, multi-slice computed tomographic coronary angiography data, coronary calcium score, and ascending aortic diameter (AAD) of 1538 patients were reviewed. In total, 197 (12.8%) patients (166 men, 31 women; age 15 - 84 years; mean 55.78 ± 12.32 years) with CAAs were identified, and 81 (5...
December 2016: Journal of International Medical Research
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