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Enza Fazio, Antonio Speciale, Salvatore Spadaro, Martina Bonsignore, Francesco Cimino, Mariateresa Cristani, Domenico Trombetta, Antonella Saija, Fortunato Neri
Tailored colloids of uniformly sized and engineered molybdenum oxide nanoparticles were produced, for the first time, by pulsed laser ablation in water. This green technique ensures the formation of contaminant-free nanostructures and the absence of by-products, very useful issues in biological applications. A selective tuning of MoO chemical bonding configurations and a suitable control of nanoparticles size distributions were achieved during the ablation processes by varying the water temperature and by applying an external electric field...
June 18, 2018: Colloids and Surfaces. B, Biointerfaces
Douglas S Franciscato, Tiago A Matias, Jorge Shinohara, Josué M Gonçalves, Narcimário P Coelho, Cleverton S Fernandes, Ernani A Basso, Helena S Nakatani, Koiti Araki, Henrique E Toma, Vagner R de Souza
The Raman spectral profile of p-methylcarbohydrazonethioamide (MCHT) is completely changed due to strong SERS effects upon bonding onto gold nanoparticles surface, but some vibrational modes are further enhanced in the presence of Hg(II) ions. The lack of SERS response for most common metal ions indicates that the coordinating groups are interacting with the gold nanoparticles surface and not available for binding metal ions in solution, except for mercury ions. The selective enhancement of some vibrational modes is consistent with significant conformational changes upon binding of Hg(II) ion onto the AuNP@MCHT hybrid, as confirmed by TEM/EDS measurements, demonstrating its potentiality as a highly selective and sensitive SERS substrate...
June 14, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Dan Zhou, Deheng Shi, Jinfeng Sun, Zunlue Zhu
This study calculates the potential energy curves of 12 Λ-S and 27 Ω states, which belong to the first dissociation channel of SiC+ cation. The potential energy curves are computed with the complete active space self-consistent field method, which is followed by the valence internally multireference configuration interaction approach with the Davidson correction. The transition dipole moments are determined. Core-valence correlation and scalar relativistic correction, as well as extrapolation of the potential energies to the complete basis set limit are included...
June 15, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Fouaz S Ayachi, Jean-Marc Drouet, Yvan Champoux, Catherine Guastavino
OBJECTIVES: In this article, we seek to determine how sensitive road cyclists are to vertical vibration transmitted while riding a road bicycle and to propose metrics for the evaluation of dynamic comfort. BACKGROUND: Road cyclists are exposed to random-type excitation due to road roughness. Vibration transmitted affects dynamic comfort. But how sensitive are cyclists to vibration level? What are the best metrics to measure the amount of vibration transmitted to cyclists? Previous studies used sinusoidal excitation with participants on rigid seats and measured acceleration...
June 1, 2018: Human Factors
Mitchell D Anderson, Santiago Tarrago Velez, Kilian Seibold, Hugo Flayac, Vincenzo Savona, Nicolas Sangouard, Christophe Galland
We propose and demonstrate a versatile technique to measure the lifetime of the one-phonon Fock state using two-color pump-probe Raman scattering and spectrally resolved, time-correlated photon counting. Following pulsed laser excitation, the n=1 phonon Fock state is probabilistically prepared by projective measurement of a single Stokes photon. The detection of an anti-Stokes photon generated by a second, time-delayed laser pulse probes the phonon population with subpicosecond time resolution. We observe strongly nonclassical Stokes-anti-Stokes correlations, whose decay maps the single phonon dynamics...
June 8, 2018: Physical Review Letters
Yunan Gao, Aaron J Goodman, Pin-Chun Shen, Jing Kong, William A Tisdale
Second-order nonlinear optical interactions, including second harmonic generation (SHG) and sum-frequency generation (SFG), can reveal a wealth of information about chemical, electronic, and vibrational dynamics at the nanoscale. Here, we demonstrate a powerful and flexible new approach, called phase-modulated degenerate parametric amplification (DPA). The technique, which allows for facile retrieval of both the amplitude and phase of the second-order nonlinear optical response, has many advantages over conventional or heterodyne-detected SHG, including the flexibility to detect the signal at either the second harmonic or fundamental field wavelength...
June 22, 2018: Nano Letters
Max Willistein, Julian Haas, Jonathan Fuchs, Sebastian Estelmann, Sascha Ferlaino, Michael Müller, Steffen Lüdeke, Matthias Boll
Birch reductions of aromatic hydrocarbons via single electron transfer steps depend on alkali metals, ammonia, and cryogenic reactions conditions. In contrast, 2 naphthoyl coenzyme A (2 NCoA) and 5,6 dihydro 2 NCoA (5,6 DHNCoA) reductases catalyze two two-electron reductions of the naphthoyl-ring system to tetrahydronaphthoyl-CoA at ambient temperature. Using a number of substrate analogues, we provide evidence for a Meisenheimer complex analogous intermediate during 2-NCoA reduction, while the subsequent reduction of 5,6 dihydro 2 NCoA is suggested to proceed via an unprecedented cationic transition state...
June 22, 2018: Chemistry: a European Journal
Nacer Ferrah
This comparative study investigates pre-concentration/separation procedure for the magnetic solid phase extraction of Hg(II) species by a new green materials: naked magnetic chitosan flakes coated Fe3 O4 micro-particles (NMCFs) and magnetic chitosan flakes coated Fe3 O4 micro-particles embedded ethylenediaminetetraacetic-disodium (MCFs-EDTA-Na2 ) in a batch process. The sorption procedure was optimized by using model solutions containing mercury(II) ions in chloride medium. The influence of experimental parameters like pH, time reaction, initial Hg(II) concentration, and ionic strength was investigated...
June 21, 2018: Environmental Science and Pollution Research International
L Aarhus, E Stranden, K-C Nordby, E Einarsdottir, R Olsen, B Ruud, R Bast-Pettersen
Background: Vibration-induced white finger (VWF) is often assessed using the Stockholm Workshop Scale (SWS) and cold challenge plethysmography. However, long-term longitudinal studies using both methods are scarce. Aims: To study the long-term course and prognostic factors of VWF assessed with the SWS and photoplethysmography (PPG), and to examine the effects of lifestyle on PPG score, regardless of VWF status. Methods: Forty male construction workers were examined with a test battery and clinical examination in 1994 and 2016/17...
June 19, 2018: Occupational Medicine
Amin Kalaaji, Stine Dreyer, Line Vadseth, Ivana Maric, Vanja Jönsson, Trond H Haukebøe
Background: Use of gluteal augmentation with fat increased by 3267% from 2002 to 2015, and the rate of death is highest compared with other aesthetic procedures: 1 in 3448 patients dies, compared with 1 in 55,000. Objectives: To retrospectively investigate patients who underwent this procedure at Oslo Plastic Surgery Clinic, to review international data determine factors causing mortality, and to provide guidelines for safety. Methods: Patient data were searched for reason for the procedure, assessment of patients, techniques performed, and safety measures used...
June 20, 2018: Aesthetic Surgery Journal
Robin A Samlan, Melda Kunduk, Takeshi Ikuma, Mindy Black, Christianne Lane
Purpose: The purpose of this study was to identify the extent to which 7 measures of glottal area timing and regularity differ between older adults with and without age-related dysphonia (ARD). Method: Laryngeal high-speed videoendoscopy was completed at 4,000 frames per second for 42 adults aged 70 years and older (ARD: 9 female, 5 male; control group: 15 female, 13 male). Relative glottal gap, open quotient, speed index, maximum area declination rate, harmonics-to-noise ratio, harmonic richness factor, and standard deviation of fundamental frequency were measured from a 0...
June 21, 2018: American Journal of Speech-language Pathology
Konstantinos Vogiatzis, Vassiliki Zafiropoulou, Haralampos Mouzakis
The Line 3 Extension from Aghia Marina to Piraeus constitutes one of the most significant construction projects in full development in Athens Greater area. For the management and abatement of the air borne noise generated from surface, and/or underground construction activities, relevant machinery operation, and trucks movements at open worksites and the tunnel, a continuous monthly noise and vibration monitoring program is enforced in order to assess any potential intrusion of the acoustic environment. On basis of measured 24 hour Leq noise levels, both Lden and Lnight EU indices were assessed along with vibration velocity for every worksite and tunnel construction activity...
October 15, 2018: Science of the Total Environment
S M Shugurov, A I Panin, S I Lopatin
RATIONALE: CeO2 -WO3 and CeO2 -MoO3 catalysts have shown excellent performance in the selective reduction of NOx by ammonia (NH3 -selective catalytic reduction) over a wide temperature range. Strong interaction between CeO2 and WO3 or MoO3 might be the dominant reason for the high activity of these mixed oxides. Studies of ceria-containing gaseous salts involve considerable experimental difficulties, since the transition of such salts to vapor requires high temperatures. To predict the possibility of the existence of gaseous associates formed by cerium and molybdenum (tungsten) oxides it is important to know their thermodynamic characteristics...
June 21, 2018: Rapid Communications in Mass Spectrometry: RCM
Xirui Lu, Xiaoyan Shu, Shunzhang Chen, Kuibao Zhang, Fangtin Chi, Haibin Zhang, Dadong Shao, Xueli Mao
In this research, the heavy-ion irradiation effects of U-bearing Gd2 Zr2 O7 ceramics were explored for nuclear waste immobilization. U3 O8 was designed to be incorporated into Gd2 Zr2 O7 from two different routes in the form of (Gd1-4 x U2 x )2 (Zr1- x Ux )2 O7 (x = 0.1, 0.14). The self-irradiation of actinide nuclides was simulated by Xe20+ heavy-ion radiation under different fluences. Grazing incidence X-ray diffraction (GIXRD) analysis reveals the relationship between radiation dose, damage and depth. The radiation tolerance is promoted with the increment of U3 O8 content in the discussed range...
June 12, 2018: Journal of Hazardous Materials
Stefania Vergura, Ernesto Santoro, Marco Masi, Antonio Evidente, Patrizia Scafato, Stefano Superchi, Giuseppe Mazzeo, Giovanna Longhi, Sergio Abbate
Jonquailine, a new alkaloid recently isolated from Narcissus jonquilla quail, an Amaryllidacea species cultivated for its fragrance flowers in Europe and USA, shows very significant anti-proliferative activity against several malignant cancer cell types. Although it was reported that this activity is related to the functionalities and to its stereochemistry at C-8 of B ring, the absolute configuration at this stereocenter was not known. Density functional theory (DFT) calculations of chiroptical properties, namely electronic circular dichroism (ECD), vibrational circular dichroism (VCD), and optical rotatory dispersion (ORD) are employed here to complete assignment of absolute configuration of jonquailine, and then, by extension, to its analogues pretazettine and 8-O-methylpretazettine...
June 18, 2018: Fitoterapia
Ashwinikumar Patil, Datta More, Anant Patil, Kishor A Jadhav, Myriam E Vijil Mejia, Suresh S Patil
OBJECTIVE: To examine the clinical pattern of foot-related complications in type 2 diabetes patients. MATERIAL AND METHODS: A cross-sectional study was conducted among indoor, adult type 2 diabetes patients with risk factors for diabetic foot complications. The diabetic neuropathy symptom score (DNSS), Doppler scanning, ankle brachial pressure index (ABPI) assessment, neuropathy assessment, neuropathic disability score (NDS), biothesiometry evaluation, and bacteriological examination was performed...
April 18, 2018: Curēus
Luenda E Charles, Claudia C Ma, Cecil M Burchfiel, Renguang G Dong
Background: According to the US Bureau of Labor Statistics, musculoskeletal disorders (MSDs) accounted for 32% of all nonfatal injury and illness cases in 2014 among full-time workers. Our objective was to review and summarize the evidence linking occupational exposures to vibration and awkward posture with MSDs of the shoulder and neck. Methods: A literature search was conducted using the terms musculoskeletal disorders, vibration, and awkward posture. All types of observational epidemiologic studies, with the exception of case reports, published during 1998-2015 were included...
June 2018: Safety and Health At Work
Aneta Szymaszek, Anna Dacewicz, Paulina Urban, Elzbieta Szelag
Many studies revealed a link between temporal information processing (TIP) in a millisecond range and speech perception. Previous studies indicated a dysfunction in TIP accompanied by deficient phonemic hearing in children with specific language impairment (SLI). In this study we concentrate in SLI on phonetic identification, using the voice-onset-time (VOT) phenomenon in which TIP is built-in. VOT is crucial for speech perception, as stop consonants (like /t/ vs. /d/) may be distinguished by an acoustic difference in time between the onsets of the consonant (stop release burst) and the following vibration of vocal folds (voicing)...
2018: Frontiers in Human Neuroscience
Malik A Hakeem, Daniel E Jackson, James J Hamlin, Daniel Errandonea, John E Proctor, Marco Bettinelli
We studied the electronic and vibrational properties of monazite-type SrCrO4 under compression. The study extended the pressure range of previous studies from 26 to 58 GPa. The existence of two previously reported phase transitions was confirmed at 9 and 14 GPa, and two new phase transitions were found at 35 and 48 GPa. These transitions involve several changes in the vibrational and transport properties with the new high-pressure phases having a conductivity lower than that of the previously known phases. No evidence of chemical decomposition or metallization of SrCrO4 was detected...
June 21, 2018: Inorganic Chemistry
Tohru Taniguchi, Kie Nakano, Kenji Monde
The chemistry of artificial nucleosides is associated with the difficulties in the characterization of the stereochemistry and conformation of their furanose ring moiety. This unit describes how to use vibrational circular dichroism (VCD) spectroscopy to identify the three-dimensional structure of nucleosides. The experimental part of this protocol is dedicated to obtain a VCD spectrum of a sample with high S/N ratio. The computational part generally starts with a conformational search using molecular mechanics and the following structural optimization by density functional theory calculation...
March 2018: Current Protocols in Nucleic Acid Chemistry
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