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https://www.readbyqxmd.com/read/29775365/raman-spectral-band-oscillations-in-large-graphene-bubbles
#1
Yuan Huang, Xiao Wang, Xu Zhang, Xianjue Chen, Baowen Li, Bin Wang, Ming Huang, Chongyang Zhu, Xuewei Zhang, Wolfgang S Bacsa, Feng Ding, Rodney S Ruoff
Raman spectra of large graphene bubbles showed size-dependent oscillations in spectral intensity and frequency, which originate from optical standing waves formed in the vicinity of the graphene surface. At a high laser power, local heating can lead to oscillations in the Raman frequency and also create a temperature gradient in the bubble. Based on Raman data, the temperature distribution within the graphene bubble was calculated, and it is shown that the heating effect of the laser is reduced when moving from the center of a bubble to its edge...
May 4, 2018: Physical Review Letters
https://www.readbyqxmd.com/read/29775317/a-combined-sfg-and-thin-liquid-film-study-of-the-specific-effect-of-monovalent-cations-on-interfacial-water-structure
#2
Afshin Asadzadeh Shahir, Khristo Khristov, Khoi Tan Nguyen, Anh V Nguyen, Elena D Mileva
Some salts have been recently shown to decrease the SFG (sum frequency generation spectroscopy) intensity of the hydrogen-bonded water molecules, but a quantitative explanation is still awaited. Here we report a similar trend for the chloride salts of monovalent cations, i.e., LiCl, NaCl, and CsCl, at low concentrations. Specifically, we revealed not only the specific adsorption of cations at the water surface but also the concentration-dependent effect of ions on the SFG response of the interfacial water molecules...
May 18, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29774770/high-neurofilament-levels-are-associated-with-clinically-definite-multiple-sclerosis-in-children-and-adults-with-clinically-isolated-syndrome
#3
Roos M van der Vuurst de Vries, Yu Yi M Wong, Julia Y Mescheriakova, E Daniëlle van Pelt, Tessel F Runia, Naghmeh Jafari, Theodora Am Siepman, Marie-José Melief, Annet F Wierenga-Wolf, Marvin M van Luijn, Johnny P Samijn, Rinze F Neuteboom, Rogier Q Hintzen
BACKGROUND: A promising biomarker for axonal damage early in the disease course of multiple sclerosis (MS) is neurofilament light chain (NfL). It is unknown whether NfL has the same predictive value for MS diagnosis in children as in adults. OBJECTIVE: To explore the predictive value of NfL levels in cerebrospinal fluid (CSF) for MS diagnosis in paediatric and adult clinically isolated syndrome (CIS) patients. METHODS: A total of 88 adult and 65 paediatric patients with a first attack of demyelination were included and followed (mean follow up-time in adults: 62...
May 1, 2018: Multiple Sclerosis: Clinical and Laboratory Research
https://www.readbyqxmd.com/read/29774748/assessment-of-trazodone-induced-cardiotoxicity-after-repeated-doses-in-rats
#4
O Atli, V Kilic, M Baysal, G Kilic, G Gormus, S Ucarcan, B Korkut, S Ilgin
Trazodone (TRZ) is an antidepressant drug commonly used in the treatment of depression, anxiety, and insomnia. Although some studies demonstrated the adverse effects of TRZ related to cardiovascular system, the conflicting results were observed in these studies. Therefore, we aimed to investigate the cardiac adverse effects of TRZ in rats at repeated doses in our study. In accordance with this purpose, TRZ was administered orally to rats at 5, 10, and 20 mg/kg doses for 28 days. Electrocardiogram records, serum aspartate aminotransferase (AST), lactate dehydrogenase, creatine kinase-myoglobin band, cardiac troponin-T (cTn-T) levels, DNA damage in cardiomyocytes, and histologic view of heart tissues were evaluated...
January 1, 2018: Human & Experimental Toxicology
https://www.readbyqxmd.com/read/29773984/midfrontal-theta-and-posterior-parietal-alpha-band-oscillations-support-conflict-resolution-in-a-masked-affective-priming-task
#5
Jun Jiang, Kira Bailey, Xiao Xiao
Past attempts to characterize the neural mechanisms of affective priming have conceptualized it in terms of classic cognitive conflict, but have not examined the neural oscillatory mechanisms of subliminal affective priming. Using behavioral and electroencephalogram (EEG) time frequency (TF) analysis, the current study examines the oscillatory dynamics of unconsciously triggered conflict in an emotional facial expressions version of the masked affective priming task. The results demonstrate that the power dynamics of conflict are characterized by increased midfrontal theta activity and suppressed parieto-occipital alpha activity...
2018: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/29773972/genetic-diversity-and-structure-of-tea-plant-in-qinba-area-in-china-by-three-types-of-molecular-markers
#6
Yu Zhang, Xiaojuan Zhang, Xi Chen, Wang Sun, Jiao Li
Background: Qinba area has a long history of tea planting and is a northernmost region in China where Camellia sinensis L. is grown. In order to provide basic data for selection and optimization of molecular markers of tea plants. 118 markers, including 40 EST-SSR, 40 SRAP and 38 SCoT markers were used to evaluate the genetic diversity of 50 tea plant ( Camellia sinensis. ) samples collected from Qinb. tea germplasm, assess population structure. Results: In this study, a total of 414 alleles were obtained using 38 pairs of SCoT primers, with an average of 10...
2018: Hereditas
https://www.readbyqxmd.com/read/29772821/a-preliminary-analysis-of-wind-retrieval-based-on-gf-3-wave-mode-data
#7
Lei Wang, Bing Han, Xinzhe Yuan, Bin Lei, Chibiao Ding, Yulin Yao, Qi Chen
This paper presents an analysis of measurements of the normalized radar cross-(NRCS) in Wave Mode for Chinese C-band Gaofen-3(GF-3) synthetic aperture radar (SAR). Based on 2779 images from GF-3 quad-polarization SAR in Wave Mode and collocated wind vectors from ERA-Interim, this experiment verifies the feasibility of using ocean surface wind fields and VV-polarized NRCS to perform normalized calibration. The method uses well-validated empirical C-band geophysical model function (CMOD4) to estimate the calibration constant for each beam...
May 17, 2018: Sensors
https://www.readbyqxmd.com/read/29771683/an-individualized-strategy-to-estimate-the-effect-of-deformable-registration-uncertainty-on-accumulated-dose-in-the-upper-abdomen
#8
Yibing Wang, Steven F Petit, Eliana Vasquez Osorio, Vikas Gupta, Alejandra Méndez Romero, Ben J M Heijmen
In the abdomen, it is challenging to assess the accuracy of deformable image registration (DIR) for individual patients, due to the lack of clear anatomical landmarks, which can hamper clinical applications that require high accuracy DIR, such as adaptive radiotherapy. In this study, we propose and evaluate a methodology for estimating the impact of uncertainties in DIR on calculated accumulated dose in the upper abdomen, in order to aid decision making in adaptive treatment approaches. 
 Sixteen liver metastasis patients treated with SBRT were evaluated...
May 17, 2018: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/29771438/methylene-blue-attenuates-renal-ischemia-reperfusion-injury-by-negative-regulation-of-nlrp3-signaling-pathway
#9
J-J Liu, L Lu, F-Q Hu, H Yuan, Q Xu, Y-F Qin, J-H Gong
OBJECTIVE: To investigate the effect of methylene blue (MB) on renal ischemia-reperfusion (IR) injury in mice and its possible relevant mechanisms. MATERIALS AND METHODS: A total of 30 male C57/BL6 mice aged 4 months old were randomly divided into the following three groups: Sham group (n=10), IR group (n=10), and MB group (n=10). Mice in MB group were treated with gavage continuously using methylene blue solution (dosage: 25 mg·kg-1·d-1) until they were 7 months old...
May 2018: European Review for Medical and Pharmacological Sciences
https://www.readbyqxmd.com/read/29771111/the-chemical-history-of-a-bubble
#10
Kenneth S Suslick, Nathan C Eddingsaas, David J Flannigan, Stephen D Hopkins, Hangxun Xu
Acoustic cavitation (the growth, oscillation, and rapid collapse of bubbles in a liquid) occurs in all liquids irradiated with sufficient intensity of sound or ultrasound. The collapse of such bubbles creates local heating and provides a unique source of energy for driving chemical reactions. In addition to sonochemical bond scission and formation, cavitation also induces light emission in many liquids. This phenomenon of sonoluminescence (SL) has captured the imagination of many researchers since it was first observed 85 years ago...
May 17, 2018: Accounts of Chemical Research
https://www.readbyqxmd.com/read/29770827/%C3%AF-%C3%AF-stacking-induced-high-current-density-and-improved-efficiency-in-ternary-organic-solar-cells
#11
Lijuan Li, Hui Lin, Xiao Kong, Xiaoyang Du, Xinwei Chen, Ling Zhou, Silu Tao, Caijun Zheng, Xiaohong Zhang
Ternary blend systems have been used to enhance the short-circuit current density (JSC) and fill factor (FF) of organic solar cells (OSCs). However, it is still a challenge to find suitable third components that concurrently possess complementary light absorption and well-matched energy levels. Here, a small organic molecule, 4,4'-(9,9-dihexyl-9H-fluorene-2,7-diyl)bis(N,N-bis(4-(pyren-1-yl)phenyl)anili-ne) (DFNPy), which contains a triphenylamine core and bulky pyrene rings, was designed and used to construct ternary blend OSCs...
May 17, 2018: Nanoscale
https://www.readbyqxmd.com/read/29770657/-cloning-expression-and-immunity-analysis-of-transketolase-of-echinococcus-granulosus
#12
Cao De-Ping, Zhang Yao-Gang, Li Chao-Qun, Liu Jia, Jiang Bo-Fan
OBJECTIVE: To obtain the prokaryotic expression of transketolase genes and analyze its value as a diagnostic antigen for echinococcosis. METHODS: TK gene was amplified by PCR and cloned into prokaryotic vector pMD19-EgTK, and then subcloned into the expression vector pET-28a. The target gene TK prokaryotic expression plasmid pET-28a was constructed and transferred into BL21. The purified protein was identified by SDS-PAGE and Western blotting. The blood samples of patients with cystic echinococcosis (CE group), alveolar echinococcosis (AE group) and healthy people (healthy group) were collected and detected by ELISA with the recombinant EgTK protein as a diagnostic antigen...
April 20, 2018: Zhongguo Xue Xi Chong Bing Fang Zhi za Zhi, Chinese Journal of Schistosomiasis Control
https://www.readbyqxmd.com/read/29770396/screening-effects-on-the-field-enhancement-factor-of-zigzag-graphene-nanoribbon-arrays-a-first-principles-study
#13
Han Hu, Tzu-Chien Lin, Tsan-Chuen Leung, Wan-Sheng Su
The field screening effect on the electronic and field-emission properties of zigzag graphene nanoribbons (ZGNRs) has been studied using first-principles calculations. We have systematically investigated the effects of inter-ribbon distance and ribbon width on the work function, field enhancement factor, band gap and edge magnetism of zigzag graphene nanoribbons (ZGNRs). It is found that the work function of ZGNRs increases rapidly as the inter-ribbon distance Dx increases, which is caused by the positive dipole at the edge of the ribbon...
May 17, 2018: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29770370/alkyl-chain-elongation-and-acyl-group-effects-in-a-series-of-eu-tb-complexes-with-hexadentate-%C3%AF-electronic-skeletons-and-their-enhanced-luminescence-in-solutions
#14
Shuhei Ogata, Naoto Goto, Shoya Sakurai, Ayumi Ishii, Miho Hatanaka, Koushi Yoshihara, Ryota Tanabe, Kyosuke Kayano, Ryo Magaribuchi, Kenta Goto, Miki Hasegawa
Five Eu complexes with long alkyl chain groups, abbreviated as EuLCx ("x" indicates the number of methylene groups: x = 8, 12, 14, 18, and 22), were synthesized to evaluate their structural and luminescence properties in chloroform. The mother helicate Eu complex, EuL, which has two bipyridine moieties bridged by an ethylenediamine, has been previously reported. A reduced form in which the azomethine groups of L also coordinated to the Eu ion, EuLH, was newly prepared. EuLH also adopts a helicate molecular structure based on single crystal X-ray structural analysis...
May 17, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29768422/an-endangered-new-species-of-seasonal-killifish-of-the-genus-austrolebias-cyprinodontiformes-aplocheiloidei-from-the-bermejo-river-basin-in-the-western-chacoan-region
#15
Felipe Alonso, Guillermo Enrique Terán, Pablo Calviño, Ignacio García, Yamila Cardoso, Graciela García
Austrolebias wichi, new species, is herein described from seasonal ponds of the Bermejo river basin in the Western Chacoan district in northwestern Argentina. This species was found in a single pond, a paleochannel of the Bermejo River, which is seriously disturbed by soybean plantations surrounding it. Despite intensive sampling in the area, this species was only registered in this pond where it was relatively scarce. Therefore, we consider this species as critically endangered. This species is the sister species of A...
2018: PloS One
https://www.readbyqxmd.com/read/29767657/structural-and-electrochemical-studies-of-tio-2-complexes-with-4-4-1e-1-e-2-5-bis-octyloxy-1-4-phenylene-bis-ethene-2-1-diyl-bis-e-n-2-5-bis-octyloxy-benzylidene-imine-derivative-bases-towards-organic-devices
#16
Anna Rozycka, Agnieszka Iwan, Krzysztof Artur Bogdanowicz, Michal Filapek, Natalia Górska, Agnieszka Hreniak, Monika Marzec
Three (4,4'-((1E,1'E)-(2,5-bis(octyloxy)-1,4-phenylene)bis(ethene-2,1-diyl))bis-(E)-N-(2,5-bis(octyloxy)benzylidene)) imine derivatives were synthesized via a condensation reaction with p-toluenesulfonic acid as a catalyst. The effects of the end groups and vinylene (-HC[double bond, length as m-dash]CH-) moieties on the structural, thermal, optical, electrochemical and photovoltaic properties of imines were investigated to check the influence of TiO2 on the imine properties. The thermal behavior of imines and their complexes with TiO2 was widely investigated using FT-IR, XRD, DSC and POM methods in order to determine the order type in the imine structure...
May 16, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29767527/tuning-solvated-electrons-by-polar-nonpolar-oxide-heterostructure
#17
Yanan Wang, Hongli Guo, Qijing Zheng, Wissam A Saidi, Jin Zhao
Solvated electron states at oxide/aqueous interface represent the lowest energy charge transfer pathways, thereby playing an important role in photocatalysis and electronic device applications. However, their energies are usually higher than the conduction band minimum (CBM), which makes the solvated electrons difficult to utilize in charge transfer processes. Thus, it is essential to stabilize the energy of the solvated electron states. In this report, taking LaAlO3/SrTiO3 (LAO/STO) oxide heterostructure with H2O adsorbed monolayer as a prototypical system, we show using DFT and ab initio time dependent nonadiabatic molecular dynamics simulation that the energy and dynamics of solvated electrons can be tuned by the electric field in the polar-nonpolar oxide heterostructure...
May 16, 2018: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/29767294/multiband-and-broadband-absorption-enhancement-of-monolayer-graphene-at-optical-frequencies-from-multiple-magnetic-dipole-resonances-in-metamaterials
#18
Bo Liu, Chaojun Tang, Jing Chen, Ningyan Xie, Huang Tang, Xiaoqin Zhu, Gun-Sik Park
It is well known that a suspended monolayer graphene has a weak light absorption efficiency of about 2.3% at normal incidence, which is disadvantageous to some applications in optoelectronic devices. In this work, we will numerically study multiband and broadband absorption enhancement of monolayer graphene over the whole visible spectrum, due to multiple magnetic dipole resonances in metamaterials. The unit cell of the metamaterials is composed of a graphene monolayer sandwiched between four Ag nanodisks with different diameters and a SiO2 spacer on an Ag substrate...
May 16, 2018: Nanoscale Research Letters
https://www.readbyqxmd.com/read/29767187/separately-enhanced-dual-emissions-of-the-amphiphilic-derivative-of-2-2-hydroxylphenyl-benzothiazole-by-supramolecular-complexation
#19
Chengfeng Wu, Yingzhi Jin, Dahua Li, Lan Ding, Yuzhi Xing, Kaicheng Zhang, Bo Song
Here, we report separately enhanced dual emissions of the amphiphilic derivative of 2-(2'-hydroxyphenyl)benzothiazole (denoted as HBT-11) by supramolecular complexation with cyclodextrins (CDs). When dispersed in water, HBT-11 shows two relatively weak emission bands, which can be assigned to the emissions of enol- and keto-forms, the two tautomers, owing to excited-state intramolecular proton transfers. Upon the addition of α-CD and β-CD, the keto- and enol-emissions, respectively, are separately enhanced; the enhancement effect is due to the formation of HBT-11/α-CD and HBT-11/β-CD complexes through multiple hydrogen bonding and host-guest interactions, respectively...
May 16, 2018: Soft Matter
https://www.readbyqxmd.com/read/29766161/phonon-mediated-stabilization-and-softening-of-2d-transition-metal-carbides-case-studies-of-ti-2-co-2-and-mo-2-co-2
#20
Zhongheng Fu, Dominik Legut, Timothy C Germann, Chen Si, Shiyu Du, Joseph S Francisco, Ruifeng Zhang
Two-dimensional transition metal carbides (MXenes) exhibit excellent thermodynamic stability, mechanical strength and flexibility, which make them promising candidates in flexible devices and reinforcements in nanocomposites. However, the dynamic stability may intrinsically determine the preferred adsorption sites of functional groups in MXenes and lead to premature failure under finite strain before approaching the elastic limits. It is found interestingly that different adsorption sites of the functional groups correspond to the different phonon stabilities and adsorption energies of MXenes, which can be attributed to different hybridization characteristics between the metal-d and O-pz states and delocalized electron behaviors around the metal atoms...
May 16, 2018: Physical Chemistry Chemical Physics: PCCP
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