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Jan Löhler, Martin Lehmann, Veronika Segler, Stefan Volkenstein, Rolf-Dieter Battmer, Arneborg Ernst, Frederike Gräbner, Peter Schlattmann, Rainer Schönweiler, Barbara Wollenberg, Stefan Dazert
BACKGROUND: In Germany, about 15 million people are suffering from hearing loss (HL), whereas only 16 % are using hearing aids. Untreated hearing loss may lead to severe complications (e. g. social isolation, depression, progress of dementia). An early and widespread screening, beginning at the age of 50, is meant to improve this shortage in medical care. By this study, the Mini-Audio-Test (MAT), a six-question and three-step answers containing questionnaire on subjective HL, should be verified on a normal collective of subjects (sensitivity (Se), specificity (Sp), positive predictive value (Ppv))...
December 5, 2018: Laryngo- Rhino- Otologie
Norihisa Hoshino, Sena Fujita, Tomoyuki Akutagawa
One-dimensional (1D) and three-dimensional (3D) coordination polymers comprising triangular [Pt3(NO2)6(μ3-O)]2- ([Pt3]2-) units were prepared from K2[Pt3]·3H2O (1), also known as Vèzes' red salt. The reaction between 1 and excess 18-crown-6 ether afforded the 1D coordination polymer [K(18-crown-6)]2[Pt3] (2), whereas the reaction between 1, excess 18-crown-6 ether, and AgPF6 afforded the 1D coordination polymer [Ag(18-crown-6)]2[Pt3]·(CH3)2CO (3). However, the reaction between 1 and equimolar amounts of 18-crown-6 and AgPF6 afforded the 3D coordination polymer [Ag2(18-crown-6)][Pt3]·(CH3)2CO (4)...
December 5, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Tatyana S Spiridonova, Sergey F Solodovnikov, Aleksandra A Savina, Yulia M Kadyrova, Zoya A Solodovnikova, Vasiliy N Yudin, Sergey Yu Stefanovich, Elena G Khaikina
A new triple molybdate, Rb2 Ag1+3x In1-x (MoO4 )3 (0 ≤ x ≤ 0.02), was found in the course of a study of the system Rb2 MoO4 -Ag2 MoO4 -In2 (MoO4 )3 and was synthesized as both powders and single crystals by solid-state reactions and spontaneous crystallization from melts. The structure of Rb2 Ag1+3x In1-x (MoO4 )3 (x ≉ 0.004) is of a new type crystallizing in the centrosymmetric space group R-3c [a = 10.3982 (9), c = 38.858 (4) Å, Z = 12 and R = 0.0225] and contains (In,Ag)O6 octahedra and distorted Ag1O6 trigonal prisms linked by common faces to form [Ag(In,Ag)O9 ] dimers connected to each other via MoO4 tetrahedra into an open three-dimensional (3D) framework...
December 1, 2018: Acta Crystallographica. Section C, Structural Chemistry
Jiwei Huang, Changlong Yang, Qiang Song, Dongxue Liu, Li Li
A series of different ratios of Ag2 S/ZnO/ZnS nanocomposites with visible light response were prepared by a microwave-assisted hydrothermal two-step method, whose composition, crystalline structure, morphology and surface physicochemical properties were well-characterized via X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), UV-vis diffuse reflectance spectroscopy (UV-vis/DRS), photoluminescence spectrum (PL), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HR-TEM) and N2 adsorption-desorption measurements...
November 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Dongxu Ke, Ashley A Vu, Amit Bandyopadhyay, Susmita Bose
Plasma sprayed hydroxyapatite (HA) coating is known to improve the osteoconductivity of metallic implants. However, the adhesive bond strength of the coating is affected due to a mismatch in coefficients of thermal expansion (CTE) between the metal and the HA ceramic. In this study, a gradient HA coating was prepared on Ti6Al4V by laser engineered net shaping (LENSTM ) followed by plasma spray deposition. In addition, 1 wt.% MgO and 2 wt.% Ag2 O were mixed with HA to improve the biological and antibacterial properties of the coated implant...
November 27, 2018: Acta Biomaterialia
O Sacco, V Vaiano, D Sannino, R A Picca, N Cioffi
In this paper, the photocatalytic degradation of organic pollutants was investigated using Ag/ZnS nanoparticles at different noble metal loadings. The photocatalysts were prepared at room temperature by two different methods: photodeposition and chemical reduction. The obtained samples were characterized by Specific surface area measurement, X-ray photoelectron spectroscopy, X-ray Powder diffraction, ultraviolet-visible diffuse reflectance and Raman spectroscopy. The X-ray photoelectron spectroscopy spectra showed that Ag is present on ZnS surface as intermediate state between nanostructured Ag0 and Ag2 O...
November 19, 2018: Journal of Colloid and Interface Science
Yiwei Wu, Qiuyue Wang, Tingting Wu, Wei Liu, Hexin Nan, Shenghao Xu, Yizhong Shen
The simple, sensitive and specific detection of hydrogen sulfide (H2S) is of great importance due to its crucial role in food safety, environmental pollution, and various pathological and physiological processes. Here, we reported an activatable fluorescence nanoprobe-based quantum dots (QDs) for sensitive and selective monitoring of H2S in red wine, environmental water samples, and lysosome of live cancer cells. The nanoprobe was prepared through a strong electrostatic interaction between thioglycolic acid stabilized CdTe QDs and p-amino thiophenol capped silver nanoparticles (AgNPs) that resulted in the formation of the assembled nanostructure, called QDs/AgNPs nanocomplexes...
November 27, 2018: ACS Applied Materials & Interfaces
Bo Wan, Frank Schindler, Ke Wang, Kai Wu, Xiangang Wan, Titus Neupert, Hai-Zhou Lu
Negative magnetoresistance is rare in non-magnetic materials. Recently, negative magnetoresistance has been observed in the quantum limit of β-Ag2 Se, where only one band of Landau levels is occupied in a strong magnetic field parallel to the applied current. β-Ag2 Se is a material that hosts a Kramers Weyl cone with band degeneracy near the Fermi energy. Kramers Weyl cones exist at time-reversal invariant momenta in all symmorphic chiral crystals, and at a subset of these momenta, including the Γ point, in non-symmorphic chiral crystals...
November 23, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
Jingyu Liu, Fan Zhang, Andrew J Allen, Aaron C Johnston-Peck, John M Pettibone
Reported reaction kinetics of metal nanoparticles in natural and engineered systems commonly have used proxy measurements to infer chemical transformations, but extension of these methods to complex media has proven difficult. Here, we compare the sulfidation rate of AgNPs using two ion selective electrode (ISE)-based methods, which rely on either (i) direct measurement of free sulfide, or (ii) monitor the free Ag+ available in solution over time in the presence of sulfide species. Most experiments were carried out in moderately hard reconstituted water at pH 7 containing fulvic acid or humic acid, which represented a broad set of known interferences in ISE...
November 22, 2018: Nanoscale
Daniel Aranda, Samuel Valdivia, Francisco J Avila, Juan Soto, Juan C Otero, Isabel López-Tocón
Surface-enhanced Raman scattering (SERS) spectroscopy of pyridazine shows the selective enhancement of the bands recorded at about 1570, 1450 and 380 cm-1, which are assigned to two different types of vibrations. The first two correspond to in-plane 8a;νring and 19b;δ(CH) totally symmetric A1 modes, respectively, while the last band is assigned to the out-of-plane 16b;τring,B1 vibration. The selective enhancement has been analyzed on the basis of a resonant Raman process involving photoexcited metal (M)-to-molecule (A) charge transfer (CT: M-A + hν → M+-A-) states of the metal-adsorbate surface complex, which have also been related to the doublet electronic states of the corresponding radical anion of the adsorbate (A-)...
November 28, 2018: Physical Chemistry Chemical Physics: PCCP
Farwa Ahmad Kiani, Umair Shamraiz, Amin Badshah, Saira Tabassum, Misbah Ambreen, Jahangir Ali Patujo
Pristine- and strontium-doped Ag2 O nanoparticles (NPs) were synthesized utilizing the symbolic co-precipitation method, in which sodium hydroxide was used as a precipitating agent. Various instrumentation methods were employed to get an inside view of the synthesized NPs. Powdered X-ray diffraction (PXRD) analysis revealed the existence of high crystallinity and small-sized NPs (an average diameter range of 35-48 nm). Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) displayed spherical and circular disc-shaped morphology of the particles...
November 19, 2018: Artificial Cells, Nanomedicine, and Biotechnology
Ji-Yeon Yoo, Eun-Young Jang, Seong-Yun Jeong, Dae-Youn Hwang, Hong-Joo Son
The biosynthesis and biological activity of colloidal Ag2 O nanocrystals have not been well studied, although they have potential applications in many fields. For the first time, we developed a reducing agent free, cost-effective technique for Ag2 O biosynthesis using Xanthomonas sp. P5. The optimal conditions for Ag2 O synthesis were 50 °C, pH 8, and 2.5 mM AgNO3 . Using these conditions the yield of Ag2 O obtained at 10 h was about five times higher than that obtained at 12 h under unoptimized conditions...
November 17, 2018: Bioprocess and Biosystems Engineering
Yujie Li, Qingqing Wang, Huanxi Wang, Jian Tian, Hongzhi Cui
The separation of photoinduced electrons and holes can enhance the photocatalytic properties of photocatalysts. A piezoelectric field is created inside piezoelectric materials, such as ZnO and MoS2 , by applying strain. The electrons and holes become separated under the driving force of the piezoelectric field. Here, we propose combining piezoelectric MoS2 nanoflowers (NFs) and full solar response Ag2 O nanoparticles (NPs) to form a MoS2 @Ag2 O heterostructure and achieve high efficiency full solar (UV, visible, and near-infrared) photocatalysis...
November 7, 2018: Journal of Colloid and Interface Science
David Hermann, Reinhard Brückner
tert-Butyl 2,5-diaryl-3-oxopent-4-ynoates, obtained from arylacetylenes and the acid chloride of tert-butyl 2-phenylmalonate, represent strongly enolized β-ketoesters. Their C≡C bonds were activated by Ag(I) salts so that de- tert-butylating π-cyclizations occurred. The latter followed a 6- endo- dig mode giving 3,6-diaryl-4-hydroxy-2-pyrones, or a 5- exo- dig mode giving ( Z)-configured 2-aryl-4-(arylmethylidene)tetronic acids ("pulvinones"). Perfectly selective pyrone formations were induced by AgSbF6 in methanol and equally selective pulvinone formations by Ag2 CO3 and DABCO in acetonitrile...
November 16, 2018: Organic Letters
Yuping Che, Bingxin Lu, Qi Qi, Huaiqiu Chang, Jin Zhai, Kefeng Wang, Zhaoyue Liu
Due to low charge separation efficiency and poor stability, it is usually difficult for single-component photocatalysts such as graphitic carbon nitride (g-C3 N4 ) and silver chromate (Ag2 CrO4 ) to fulfill photocatalytic hydrogen production efficiently. Z-scheme charge transport mechanism that mimics the photosynthesis in nature is an effective way to solve the above problems. Inspired by photosynthesis, we report Ag2 CrO4 nanoparticles-decorated g-C3 N4 nanosheet as an efficient photocatalyst for hydrogen evolution reaction (HER) with methanol as sacrificial agent...
November 7, 2018: Scientific Reports
Abulajiang Reheman, Kuerbangnisha Kadeer, Kenji Okitsu, Maimaiti Halidan, Yalkunjan Tursun, Talifu Dilinuer, Abulizi Abulikemu
Various antibiotics in the aquatic systems have threat the aquatic ecosystem balance and the human health. In this study, a degradation treatment method for tetracycline (TC), one of the commonly used antibiotics, was explored by using novel photocatalysts of rGO/Ag2 CO3 under simulated sunlight, because conventional treatment methods are not efficient on the removal of TC. rGO/Ag2 CO3 nanocomposites were synthesized via a facile photo-ultrasonic assisted reduction method. More than 90% of TC was removed by 1% (weightrGO /weightcomposites ) rGO/Ag2 CO3 within 60 min at pH = 4, which was about 1...
October 25, 2018: Ultrasonics Sonochemistry
Prashantha Kumar T K M, Ashok Kumar S K
In the present work, new visible-light-active nanosized Ag2S-ZnS loaded on cellulose (AZCE) was synthesized by a precipitation method. The AZCE composite was systematically characterized using powder X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Brunauer-Emmett-Teller (BET) surface area, and UV-visible diffuse reflectance spectroscopy (UV-DRS). The activities of the photocatalysts were evaluated for rhodamine B dye (RhB) degradation under simulated sunlight and the amounts of the dye samples were analysed using a UV-vis spectrophotometer at λmax 554 nm...
October 26, 2018: Photochemical & Photobiological Sciences
Xiaoxia Hao, Chunyan Li, Yejun Zhang, Haozhi Wang, Guangcun Chen, Mao Wang, Qiangbin Wang
Combined chemotherapy and immunotherapy have demonstrated great potential in cancer treatment. However, it is difficult to provide clear information of the pharmacokinetics and pharmacodynamics of chemodrugs and transplanted immune cells in vivo by traditional approaches, resulting in inadequate therapy. Here, a multiplexed intravital imaging strategy by using fluorescence in the second near-infrared window (NIR-II) is first developed to visualize the two events of chemotherapy and immunotherapy in vivo, so that a combinational administration is programed to improve the therapeutical effects against a mouse model of human breast cancer...
October 25, 2018: Advanced Materials
Wataru Hiraya, Nozomi Mishima, Takaaki Shima, Seishiro Tai, Tohru Tsuruoka, Ilia Valov, Tsuyoshi Hasegawa
Doping impurity atoms into semiconductor materials changes the resistance of the material. Selecting the atomic species of a dopant and the precise control of the number of dopant atoms in a unit volume can control the resistance to a desired value. The number of dopant atoms is usually controlled when the materials are synthesized. It can also be controlled after synthesizing by injecting dopant atoms using an ion implantation technique. This physical method has now enabled atom by atom implantation at the desired position...
October 24, 2018: Faraday Discussions
Yuriy G Denisenko, Victor V Atuchin, Maxim S Molokeev, Aleksandr S Aleksandrovsky, Alexander S Krylov, Aleksandr S Oreshonkov, Svetlana S Volkova, Oleg V Andreev
Silver-europium double sulfate AgEu(SO4 )2 was obtained by solid-phase reaction between Ag2 SO4 and Eu2 (SO4 )3 . The crystal structure of AgEu(SO4 )2 was determined by Monte Carlo method with simulated annealing, and after that, it was refined by the Rietveld method from X-ray powder diffraction data. The compound crystallizes in the triclinic symmetry, space group P1̅ ( a = 0.632929(4), b = 0.690705(4), c = 0.705467(4) nm, α = 98.9614(4), β = 84.5501(4), γ = 88.8201(4)°, V = 0.303069(3) nm3 ). Two types of sulfate tetrahedra were found in the structure, which significantly affects the spectroscopic properties in the IR-range...
November 5, 2018: Inorganic Chemistry
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