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https://www.readbyqxmd.com/read/28431465/photovoltaic-properties-and-ultrafast-plasmon-relaxation-dynamics-of-diamond-like-carbon-nanocomposite-films-with-embedded-ag-nanoparticles
#1
Šarūnas Meškinis, Domantas Peckus, Andrius Vasiliauskas, Arvydas Čiegis, Rimantas Gudaitis, Tomas Tamulevičius, Iryna Yaremchuk, Sigitas Tamulevičius
Ultrafast relaxation dynamics of diamond-like carbon (DLC) films with embedded Ag nanoparticles (DLC:Ag) and photovoltaic properties of heterojunctions consisting of DLC:Ag and crystalline silicon (DLC:Ag/Si) were investigated by means of transient absorption (TAS) spectroscopy and photovoltaic measurements. The heterojunctions using both p type and n type silicon were studied. It was found that TAS spectra of DLC:Ag films were dependent on the used excitation wavelength. At wavelengths where Ag nanoparticles absorbed light most intensively, only DLC signal was registered...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28431463/enhanced-ferromagnetic-interaction-in-modulation-doped-gamnn-nanorods
#2
Yuan-Ting Lin, Paritosh Vilas Wadekar, Hsiang-Shun Kao, Yu-Jung Zheng, Quark Yung-Sung Chen, Hui-Chun Huang, Cheng-Maw Cheng, New-Jin Ho, Li-Wei Tu
In this report, ferromagnetic interactions in modulation-doped GaMnN nanorods grown on Si (111) substrate by plasma-assisted molecular beam epitaxy are investigated with the prospect of achieving a room temperature ferromagnetic semiconductor. Our results indicate the thickness of GaN layer in each GaN/MnN pair, as well as Mn-doping levels, are essential for suppressing secondary phases as well as enhancing the magnetic moment. For these optimized samples, structural analysis by high-resolution X-ray diffractometry and Raman spectroscopy verifies single-crystalline modulation-doped GaMnN nanorods with Ga sites substituted by Mn atoms...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28431434/bright-light-suppresses-form-deprivation-myopia-development-with-activation-of-dopamine-d1-receptor-signaling-in-the-on-pathway-in-retina
#3
Si Chen, Zhina Zhi, Qingqing Ruan, Qingxia Liu, Fen Li, Fen Wan, Peter S Reinach, Jiangfan Chen, Jia Qu, Xiangtian Zhou
Purpose: To determine whether dopamine receptor D1 (D1R) signaling pathway activation by bright light (BL) in specific retinal neuronal cell types contributes to inhibiting form-deprivation myopia (FDM) in mice. Methods: Mice (3-weeks old) were raised under either normal light (NL: 100-200 lux) or BL (2500-5000 lux) conditions with or without form deprivation. Refraction changes were evaluated with an eccentric infrared photorefractor, and ocular axial components with optical coherence tomography...
April 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28431362/rna-aptamer-based-electrochemical-aptasensor-for-c-reactive-protein-detection-using-functionalized-silica-microspheres-as-immunoprobes
#4
Junchun Wang, Jinjin Guo, Junjun Zhang, Wenjuan Zhang, Yuzhong Zhang
C-reactive protein (CRP) is a widely accepted biomarker of cardiovascular disease and inflammation. In this study, a RNA aptamer-based electrochemical sandwich type aptasensor for CRP detection was described using the functionalized silica microspheres as immunoprobes. Silica microspheres (Si MSs), which have good monodispersity and uniform shape, were firstly synthesized. The silica microspheres functionlized with gold nanoparticles (Au NPs) provided large surface area for immobilizing signal molecules (Zinc ions, Zn(2+)) and antibodies (Ab)...
April 13, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28431029/the-chinese-version-of-the-brief-assessment-of-cognition-in-schizophrenia-data-of-a-large-scale-mandarin-speaking-population
#5
Liang-Jen Wang, Yu-Chi Huang, Chi-Fa Hung, Chih-Ken Chen, Yi-Chih Chen, Pei-Yi Lee, Si-Ming Wang, Ming-Hsiung Liu, Chia-Ju Lin, Su-Ting Hsu
Objective: The Brief Assessment of Cognition in Schizophrenia (BACS) is a cognitive assessment tool used to measure the broad aspects of cognition that are most frequently impaired in patients with schizophrenia. This study aims to develop the normative data of the Chinese version of the BACS among the Mandarin-speaking population. Method: This cross-sectional study included 382 healthy participants (age range: 19-79 years; mean age: 48.0 ± 16.7 years, 47.6% men) in Taiwan, who were evaluated with the BACS...
May 1, 2017: Archives of Clinical Neuropsychology: the Official Journal of the National Academy of Neuropsychologists
https://www.readbyqxmd.com/read/28430499/bc8-silicon-si-iii-is-a-narrow-gap-semiconductor
#6
Haidong Zhang, Hanyu Liu, Kaya Wei, Oleksandr O Kurakevych, Yann Le Godec, Zhenxian Liu, Joshua Martin, Michael Guerrette, George S Nolas, Timothy A Strobel
Large-volume, phase-pure synthesis of BC8 silicon (Ia3[over ¯], cI16) has enabled bulk measurements of optical, electronic, and thermal properties. Unlike previous reports that conclude BC8-Si is semimetallic, we demonstrate that this phase is a direct band gap semiconductor with a very small energy gap and moderate carrier concentration and mobility at room temperature, based on far- and midinfrared optical spectroscopy, temperature-dependent electrical conductivity, Seebeck and heat capacity measurements...
April 7, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28430415/omnidirectional-harvesting-of-weak-light-using-a-graphene-quantum-dot-modified-organic-silicon-hybrid-device
#7
Meng-Lin Tsai, Dung-Sheng Tsai, Libin Tang, Lih-Juann Chen, Shu Ping Lau, Jr-Hau He
Despite great improvements in traditional inorganic photodetectors and photovoltaics, more progress is needed in the detection/collection of light at low-level conditions. Traditional photodetectors tend to suffer from high noise when operated at room temperature; therefore these devices require additional cooling systems to detect weak or dim light. Conventional solar cells also face the challenge of poor light-harvesting capabilities in hazy or cloudy weather. The real world features such varying levels of light, which makes it important to develop strategies that allow optical devices to function when conditions are less than optimal...
April 21, 2017: ACS Nano
https://www.readbyqxmd.com/read/28430275/concave-gold-bipyramids-bound-with-multiple-high-index-facets-improved-raman-and-catalytic-activities
#8
Xiaolin Kang, Qifeng Ruan, Han Zhang, Feng Bao, Jun Guo, Minghua Tang, Si Cheng, Jianfang Wang
Concave nanocrystals usually exhibit a large electromagnetic-field enhancement and superior catalytic performance due to their sharp corners, negative curvature and high-index facets. Conventional gold bipyramids (AuBPs) possess intriguing plasmonic properties which are attractive for various applications while the surface curvature of the reported bipyramids has not been fine-tuned to concave or convex structures to date. Additionally, the longitudinal surface plasmon resonance (LSPR) wavelengths of conventional AuBPs are mostly located in the range of 650-1350 nm and the sizes of these nanoparticles are usually not beyond 350 nm, which are not facilitated to some nano-focusing and nanophotonic applications...
April 21, 2017: Nanoscale
https://www.readbyqxmd.com/read/28430272/molecular-rare-earth-metal-alumosilicates
#9
Raúl Huerta-Lavorie, Dana V Báez-Rodríguez, Jessica García-Ríos, Emiliano Martínez-Vollbert, Diego Martínez-Otero, Vojtech Jancik
The synthesis and stabilization of molecular four-coordinated lanthanide alumosilicates was achieved by the use of a highly encumbered alumosilicate ligand LAl(OH·thf)(μ-O)Si(OH)(OtBu)2 (1, L = HC{C(Me)N(2,6-iPr2C6H3)}2). Reactions between 1 and tris-cyclopentadienyl lanthanides (LnCp3; Ln = Ce, Nd, Sm, Gd, Tb, Dy, Y, Er) derived in the isolation of eight compounds (2-9) where the ligand is observed in three different bonding modes: adducts (2, 3), spirocyclic (4) or cyclic (5-9) coordination compounds. The observed reactivity can be related to the ionic radius of the lanthanide atom and the nature of the oxygen donor-atom from the hydroxide (Al-OH) or hydroxyl (Si-OH) moieties in 1...
April 21, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28430269/an-active-catalytic-system-for-suzuki-miyaura-cross-coupling-reactions-using-low-levels-of-palladium-loading
#10
Meng-Qi Yan, Jia Yuan, Fang Lan, Si-Hao Zeng, Meng-Yue Gao, Sheng-Hua Liu, Jian Chen, Guang-Ao Yu
An easily available Pd(OAc)2/(2-(anthracen-9-yl)-1H-inden-3-yl) dicyclohexylphosphine/toluene/(i)PrOH/water catalytic system was developed, which shows high catalytic activity in the Suzuki-Miyaura cross-coupling reactions of a diverse array of aryl and heteroaryl chlorides with Pd loadings down to 0.01 mol%.
April 21, 2017: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/28429951/-robotic-assisted-radical-prostatectomy-results-of-1500-surgeries
#11
J Kočárek, J Heráček, M Čermák, F Chmelík, M Matějková
INTRODUCTION: Prostate cancer is the most common malignant disease in men. The number of cases of prostate cancer has increased dramatically in recent 20 years. Radical prostatectomy is a surgical method for the first-line treatment of localised prostate cancer. We performed the first robotic-assisted radical prostatectomy on December 16th, 2005, achieved the boundary of 1000 robotic-assisted radical prostatectomies in 2012, and in 2015, we successfully completed the 1500th robotic-assisted operation on the prostate...
2017: Rozhledy V Chirurgii: Měsíčník Československé Chirurgické Společnosti
https://www.readbyqxmd.com/read/28429844/a-comparison-of-clinical-characteristics-of-older-adults-treated-with-antidepressants-in-general-and-psychiatric-hospitals-in-asia
#12
Yuan-Yuan Wang, Yu-Tao Xiang, Gabor S Ungvari, Chee H Ng, Helen F K Chiu, Larina C L Yim, Tian-Mei Si, Kok-Yoon Chee, Ajit Avasthi, Sandeep Grover, Mian-Yoon Chong, Kang Sim, Shigenobu Kanba, Yan-Ling He, Min-Soo Lee, Shu-Yu Yang, Pichet Udomratn, Roy A Kallivayalil, Andi J Tanra, Margarita M Maramis, Winston W Shen, Norman Sartorius, Rathi Mahendran, Jia-Ying Teng, Chay-Hoon Tan, Naotaka Shinfuku
AIM: This study compared the demographics, clinical characteristics, and antidepressant prescription patterns between Asian patients aged 50 years and older attending psychiatric hospitals and those attending general hospitals. METHODS: In total, 955 patients (604 in general hospitals, 351 in psychiatric hospitals) aged 50 years or older treated with antidepressants in 10 Asian countries and territories were examined. Patients' demographics, clinical features, and prescriptions of psychotropic drugs were recorded using a standardized protocol and data collection procedure...
April 21, 2017: Psychogeriatrics: the Official Journal of the Japanese Psychogeriatric Society
https://www.readbyqxmd.com/read/28429813/rh-catalyzed-direct-arylation-of-a-polyhedral-oligomeric-silsesquioxane
#13
Hiroaki Imoto, Satoshi Wada, Kensuke Naka
The electronic properties of polyhedral oligomeric silsesquioxanes (POSS) have recently been subjected to study. Although theoretical calculations have predicted that POSS can work as an acceptor for π-conjugated organic units, an effective reaction to incorporate aryl groups into a POSS backbone remains to be established. In this work, Rh-catalyzed direct arylation has been developed. Heptaisobutyl-POSS with a Si-H group was reacted with various aryl halides to form aryl-substitued POSSs.
April 21, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28429793/attogram-mass-sensing-based-on-silicon-microbeam-resonators
#14
In-Bok Baek, Sangwon Byun, Bong Kuk Lee, Jin-Hwa Ryu, Yarkyeon Kim, Yong Sun Yoon, Won Ik Jang, Seongjae Lee, Han Young Yu
Using doubly-clamped silicon (Si) microbeam resonators, we demonstrate sub-attogram per Hertz (ag/Hz) mass sensitivity, which is extremely high sensitivity achieved by micro-scale MEMS mass sensors. We also characterize unusual buckling phenomena of the resonators. The thin-film based resonator is composed of a Si microbeam surrounded by silicon nitride (SiN) anchors, which significantly improve performance by providing fixation on the microbeam and stabilizing oscillating motion. Here, we introduce two fabrication techniques to further improve the mass sensitivity...
April 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28429682/refractive-index-and-extinction-coefficient-of-nh2ch-nh2pbi3-perovskite-photovoltaic-material
#15
Ziang Xie, Shuren Sun, Yu Yan, Lili Zhang, Ruixiang Hou, Fuyang Tian, Guogang Qin
Very recently, the NH2CH=NH2PbI3 (FAPbI3) perovskite material has attracted much attention in fabricating solar cells (SCs). For a photovoltaic material, its refractive index and extinction coefficient, n(λ) and k(λ), as functions of λ, are important to study its optical properties and to estimate the power conversion efficiency potential for the SCs made of it. As far as we know, so far there is no reporting of n(λ) and k(λ) for the FAPbI3 material. In this article, with spectroscopic ellipsometry (SE) measurements, the n(λ) and k(λ), as well as Eg = 1...
April 21, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28429591/a-high-performance-furan-containing-conjugated-polymer-for-environmentally-benign-solution-processing
#16
Sang Myeon Lee, Hae Rang Lee, A-Reum Han, Junghoon Lee, Joon Hak Oh, Changduk Yang
Developing semiconducting polymers that exhibit both strong charge transport capability via highly ordered structures and good processability in environmentally benign solvents remains a challenge. Given that furan-based materials have better solubility in various solvents than analogous thiophene-based materials, we have synthesized and characterized furanyl-diketopyrrolopyrrole polymer (PFDPPTT-Si) together with its thienyl-diketopyrrolopyrrole-based analogue (PTDPPTT-Si) to understand subtle changes induced by the use of furan instead of thiophene units...
April 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28429543/on-the-formation-of-smaller-p-block-endohedral-fullerenes-bonding-analysis-in-the-e-c20-e%C3%A2-%C3%A2-si-ge-sn-pb-series-from-relativistic-dft-calculations
#17
Alvaro Muñoz-Castro, R Bruce King
Experimentally characterized endohedral metallofullerenes are of current interest in expanding the range of viable fullerenic structures and their applications. Smaller metallofullerenes, such as M@C28 , show that several d- and f-block elements can be efficiently confined in relatively small carbon cages. This article explores the potential capabilities of the smallest fullerene cage, that is, C20 , to encapsulate p-block elements from group 14, that is, E = Si, Ge, Sn, and Pb. Our interest relates to the bonding features and optical properties related to E@C20 ...
April 20, 2017: Journal of Computational Chemistry
https://www.readbyqxmd.com/read/28429419/semi-synthesis-of-murine-prion-protein-by-native-chemical-ligation-and-chemical-activation-for-preparation-of-polypeptide-%C3%AE-thioester
#18
Lei Shi, Huai Chen, Si-Yu Zhang, Ting-Ting Chu, Yu-Fen Zhao, Yong-Xiang Chen, Yan-Mei Li
Prions are suspected as pathogen of the fatal transmissible spongiform encephalopathies. Strategies to access homogenous prion protein (PrP) are required to fully comprehend the molecular mechanism of prion diseases. However, the polypeptide fragments from PrP show a high tendency to form aggregates, which is a gigantic obstacle of protein synthesis and purification. In this study, murine prion sequence 90 to 230 that is the core three-dimensional structure domain was constructed from three segments murine PrP (mPrP)(90-177), mPrP(178-212), and mPrP(213-230) by combining protein expression, chemical synthesis and chemical ligation...
April 21, 2017: Journal of Peptide Science: An Official Publication of the European Peptide Society
https://www.readbyqxmd.com/read/28429410/photoelectroreduction-toward-chemical-building-blocks
#19
Fengjiao Chen, Wei Cui, Jie Zhang, Yeyun Wang, Junhua Zhou, Yongpan Hu, Yanguang Li, Shuit-Tong Lee
Conventional photoelectrochemical cells utilize solar energy to drive the chemical conversion of water or CO2 into useful chemical fuels. Such processes are confronted with general challenges, including the low intrinsic activities and inconvenient storage and transportation of their gaseous products. A photoelectrochemical approach is proposed to drive the reductive production of industrial building-block chemicals and demonstrate that succinic acid and glyoxylic acid can be readily synthesized on Si nanowire array photocathodes free of any cocatalyst and at room temperature...
April 21, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28429385/risk-factors-proximate-to-suicide-and-suicide-risk-assessment-in-the-context-of-denied-suicide-ideation
#20
Alan L Berman
Health care providers have significant opportunities to identify individuals at near-term risk for suicide, but lack empirical data on near-term risk factors. This study aimed to identify dynamic, state-related risk factors observed by clinical practitioners within the last 30 days of life of 157 patients who died by suicide and to compare these near-term risk factors among patients who denied versus responded positively to having suicide ideation (SI) when last asked by a clinical practitioner prior to their death...
April 21, 2017: Suicide & Life-threatening Behavior
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