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https://www.readbyqxmd.com/read/29149722/effects-of-middle-ear-quasi-static-stiffness-on-sound-transmission-quantified-by-a-novel-3-axis-optical-force-sensor
#1
Ivo Dobrev, Jae Hoon Sim, Baktash Aqtashi, Alexander M Huber, Thomas Linder, Christof Röösli
BACKGROUND: Intra-operative quantification of the ossicle mobility could provide valuable feedback for the current status of the patient's conductive hearing. However, current methods for evaluation of middle ear mobility are mostly limited to the surgeon's subjective impression through manual palpation of the ossicles. This study investigates how middle ear transfer function is affected by stapes quasi-static stiffness of the ossicular chain. The stiffness of the middle ear is induced by a) using a novel fiber-optic 3-axis force sensor to quantify the quasi-static stiffness of the middle ear, and b) by artificial reduction of stapes mobility due to drying of the middle ear...
November 10, 2017: Hearing Research
https://www.readbyqxmd.com/read/29149675/evaluation-of-potassium-ferrate-as-an-alternative-disinfectant-on-cyanobacteria-inactivation-and-associated-toxin-fate-in-various-waters
#2
Jiajia Fan, Bo-Hung Lin, Che-Wei Chang, Yuqing Zhang, Tsair-Fuh Lin
Potassium ferrate (K2FeO4) is an effective oxidant that may be used as a pre- or post-oxidant in the purification of source water with cyanobacterial issues. To provide a better basis for the application of this oxidant during water treatment processes, the impacts of K2FeO4 on the cell viability of Microcystis aeruginosa and the fate of associated microcystins (MCs) were investigated in various water matrices. The results showed that a water matrix can significantly affect the effectiveness of K2FeO4 on cyanobacteria inactivation...
November 9, 2017: Water Research
https://www.readbyqxmd.com/read/29149659/validation-of-differential-cross-sections-by-means-of-252-cf-spectral-averaged-cross-sections
#3
Martin Schulc, Michal Košťál, Stanislav Simakov, Vojtěch Rypar, Davit Harutyunyan, Jan Šimon, Nicola Burianová, Evžen Novák, Bohumil Jánský, Martin Mareček, Jan Uhlíř
The results of systematic evaluations of the spectrum-averaged cross section measurements performed in the spontaneous fission (252)Cf neutron field are presented. The Following threshold reactions were investigated: (23)Na(n,2n)(22)Na, (54)Fe(n,p)(54)Mn, (54)Fe(n,α) (51)Cr, (27)Al(n,p)(27)Mg, (27)Al(n,α)(24)Na, (19)F(n,2n)(18)F, (90)Zr(n,2n)(89)Zr and (89)Y(n,2n)(88)Y. The spectrum-averaged cross sections for (23)Na(n,2n)(22)Na, (54)Fe(n,α)(51)Cr and (89)Y(n,2n)(88)Y reactions were measured for the first time...
November 8, 2017: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/29149226/nanostructured-silicon-ferromagnet-collected-by-a-permanent-neodymium-magnet
#4
Takahisa Okuno, Stephan Thürmer, Hirofumi Kanoh
Nanostructured silicon (N-Si) was prepared by anodic electroetching of p-type silicon wafers. The obtained magnetic particles were separated by a permanent neodymium magnet as a magnetic nanostructured silicon (mN-Si). The N-Si and mN-Si exhibited different magnetic properties: the N-Si exhibited ferromagnetic-like behaviour, whereas the mN-Si exhibited superparamagnetic-like behaviour.
November 17, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/29149083/co-precipitation-synthesis-and-optical-properties-of-mn-4-doped-hexafluoroaluminate-w-led-phosphors
#5
Tim Senden, Robin G Geitenbeek, Andries Meijerink
Mn(4+)-activated hexafluoroaluminates are promising red-emitting phosphors for white light emitting diodes (w-LEDs). Here, we report the synthesis of Na₃AlF₆:Mn(4+), K₃AlF₆:Mn(4+) and K₂NaAlF₆:Mn(4+) phosphors through a simple two-step co-precipitation method. Highly monodisperse large (~20 μm) smoothed-octahedron shaped crystallites are obtained for K₂NaAlF₆:Mn(4+). The large size, regular shape and small size distribution are favorable for application in w-LEDs. All Mn(4+)-doped hexafluoroaluminates show bright red Mn(4+) luminescence under blue light excitation...
November 17, 2017: Materials
https://www.readbyqxmd.com/read/29148916/time-and-spatial-variability-in-the-concentrations-of-selected-metals-in-water-and-bottom-sediments-of-p%C3%A5-awniowice-and-dzier%C3%A5-no-ma%C3%A5-e-reservoirs-poland
#6
Rajmund Michalski, Maciej Kostecki, Joanna Kernert, Katarzyna Nocoń, Katarzyna Stahl, Zuzanna Bernaś, Michał Chrobok, Magdalena Jabłońska-Czapla
The migration of metals and metalloids between bottom sediments and water and the other way round is a complex process. Understanding those mechanisms is essential for recognizing transformations taking place in water reservoir ecosystems. The objective behind the following study was to define time and spatial correlations in the changes in total concentrations of selected elements (Cr, Zn, Co, Mn, Cu, Ni, Pb, As, Ba, Sb, Sr and V) in waters and bottom sediments from two water reservoirs located in Upper Silesia (Poland), i...
November 17, 2017: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
https://www.readbyqxmd.com/read/29148619/molten-salt-assisted-self-assembly-synthesis-of-mesoporous-licoo2-and-limn2-o4-thin-films-and-investigation-of-electrocatalytic-water-oxidation-performance-of-lithium-cobaltate
#7
Gülbahar Saat, Fadime Mert Balci, Elif Pınar Alsaç, Ferdi Karadas, Ömer Dag
Mesoporous thin films of transition metal lithiates (TML) belong to an important group of materials for the advancement of electrochemical systems. This study demonstrates a simple one pot method to synthesize the first examples of mesoporous LiCoO2 and LiMn2 O4 thin films. Molten salt assisted self-assembly can be used to establish an easy route to produce mesoporous TML thin films. The salts (LiNO3 and [Co(H2 O)6 ](NO3 )2 or [Mn(H2 O)4 ](NO3 )2 ) and two surfactants (10-lauryl ether and cethyltrimethylammonium bromide (CTAB) or cethyltrimethylammonium nitrate (CTAN)) form stable liquid crystalline mesophases...
November 17, 2017: Small
https://www.readbyqxmd.com/read/29147988/phytoextraction-with-salix-viminalis-in-a-moderately-to-strongly-contaminated-area
#8
Dávid Tőzsér, Sándor Harangi, Edina Baranyai, Gyula Lakatos, Zoltán Fülöp, Béla Tóthmérész, Edina Simon
We tested the suitability of Salix viminalis for phytoextraction with the analysis of selected elements in soil, root, and leaf, and by visual tree condition assessment in an area with varying levels of contamination. Bioconcentration factor (BCF) and translocation factor (TF) were used to assess the phytoextraction potential of willows. The middle part of the study area was strongly contaminated, while the northern and southern parts were moderately contaminated. We found increasing element concentrations toward deeper layers...
November 16, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29147682/synthesis-and-application-of-injectable-bioorthogonal-dendrimer-hydrogels-for-local-drug-delivery
#9
Leyuan Xu, Remy C Cooper, Juan Wang, W Andrew Yeudall, Hu Yang
We developed novel dendrimer hydrogels (DH)s on the basis of bioorthogonal chemistry, in which polyamidoamine (PAMAM) dendrimer generation 4.0 (G4) functionalized with strained alkyne dibenzocyclooctyne (DBCO) via PEG spacer (Mn = 2,000 g/mol) underwent strain-promoted azide-alkyne cycloaddition (SPAAC) with polyethylene glycol bisazide (PEG-BA) (Mn= 20,000 g/mol) to generate a dendrimer-PEG cross-linked network. This platform offers a high degree of functionality and modularity. A wide range of structural parameters including dendrimer generation, degree of PEGylation, loading density of clickable DBCO groups, PEG-BA chain length as well as the ratio of clickable dendrimer to PEG-BA and their concentrations can be readily manipulated to tune chemical and physical properties of DHs...
August 14, 2017: ACS Biomaterials Science & Engineering
https://www.readbyqxmd.com/read/29144820/pheochromocytoma-a-genetic-and-diagnostic-update
#10
Leilani B Mercado-Asis, Katherine I Wolf, Ivana Jochmanova, David Taïeb
OBJECTIVE: Pheochromocytomas and paragangliomas (PPGLs) are neuroendocrine tumors derived from adrenal or extra-adrenal locations, respectively. Upon suspicion of PPGL, specific metabolomic, molecular, biochemical, imaging, and histopathological studies are performed to prove, localize, treat, and monitor disease progression. Recently, improved diagnostic tools allow physicians to accurately diagnose PPGL, even in patients presenting with small (less than 1 cm) or biochemically silent tumors, which previously delayed proper detection and treatment...
November 16, 2017: Endocrine Practice
https://www.readbyqxmd.com/read/29144731/zwitterionic-manganese-and-gadolinium-metal-organic-frameworks-as-efficient-contrast-agents-for-in-vivo-magnetic-resonance-imaging
#11
Liang Qin, Zi-Yan Sun, Kai Cheng, Shu-Wen Liu, Jian-Xin Pang, Li-Ming Xia, Wen-Hua Chen, Zhen Cheng, Jin-Xiang Chen
Two water-stable three-dimensional Mn- and Gd-based metal-organic frameworks (MOFs), {[Mn2(Cmdcp)2(H2O)2]·H2O}n (1) and {[Gd(Cmdcp)(H2O)3](NO3)·3H2O}n (2, H3CmdcpBr = N-(4-carboxy benzyl)-(3,5-dicarboxyl)pyridinium bromide), have been prepared and analyzed. In vitro magnetic resonance imaging indicated that MOFs 1 and 2 possess relaxivity r1 values of 17.50 and 13.46 mM(-1)·S(-1), respectively, which are superior to that of the control Gd-DTPA (r1 = 4.87 mM(-1)·S(-1), DTPA = diethylene triamine pentaacetate)...
November 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29144131/twisting-and-tilting-1-1-bis-dialkylphosphino-ferrocene-bound-to-low-valent-tricarbonylmaganese-i-to-i
#12
K Michael Schäfer, Leonie Reinders, Jan Fiedler, Mark R Ringenberg
Recently we had reported the noninnocent behavior of 1,1'-bis(diphenylphosphino)ferrocene (dppf) in Fe(CO)3dppf [Ringenberg et al., Inorg. Chem., 2017, 56, 7501]. Moving to the left in the periodic table, HMn(CO)3(dRpf) where dRpf = dppf (1H) and 1,1'-bis(diisopropylphosphino)ferrocene (dippf) (2H) were synthesized. The hydride ligand was removed by protonation with [(Et2O)2H][B(Ar(F))4] ([B(Ar(F))4](-) = tetrakis[3,5-bis(trifluoromethyl)phenyl]borate), resulting in the rapid evolution of H2 followed by the formation of an Fe→Mn interaction...
November 16, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/29142911/fluorescent-alloy-cspb-x-mn1-x-i3-perovskite-nanocrystals-with-high-structural-and-optical-stability
#13
Quinten A Akkerman, Daniele Meggiolaro, Zhiya Dang, Filippo De Angelis, Liberato Manna
CsPbI3 nanocrystals are still limited in their use because of their phase instability as they degrade into the yellow nonemitting δ-CsPbI3 phase within a few days. We show that alloyed CsPb x Mn1-x I3 nanocrystals have essentially the same optical features and crystal structure as the parent α-CsPbI3 system, but they are stable in films and in solution for periods over a month. The stabilization stems from a small decrease in the lattice parameters slightly increasing the Goldsmith tolerance factor, combined with an increase in the cohesive energy...
September 8, 2017: ACS Energy Letters
https://www.readbyqxmd.com/read/29142842/prevention-and-management-of-bleeding-in-thyroid-surgery
#14
REVIEW
Gabriele Materazzi, Carlo Enrico Ambrosini, Lorenzo Fregoli, Luigi De Napoli, Gianluca Frustaci, Valeria Matteucci, Piermarco Papini, Sohail Bakkar, Paolo Miccoli
Post-thyroidectomy neck hematoma represents a major concern for surgeons because it can result in severe and even life-threatening complications. In fact, postoperative hemorrhage may result in airway compression and respiratory distress, and therefore, effective hemostasis is an important goal in thyroid surgery. Postoperative hematoma occurs at a rate of approximately 0.1% to 1.1%. Almost all cases occur in the first 6 h after surgery and can be the result of several surgeon or patient factors. For many years the clamp-and-tie technique has been the most common way to divide the main vascular pedicles of the thyroid gland...
October 2017: Gland Surgery
https://www.readbyqxmd.com/read/29141366/-in-vitro-early-detection-of-amyloid-plaques-in-alzheimer-s-disease-by-pittsburgh-compound-b-modified-magnetic-nanoparticles
#15
J Q Zeng, J Q Wu, M H Li, P J Wang
Objective: To construct magnetic nanoparticles targeting β-amyloid (Aβ) plaques, the pathological biomarker of Alzheimer's disease (AD) and to study their binding capability in vitro. Methods: Superparamagnetic nanoparticles Mn(0.6)Zn(0.4)Fe(2)O(4) (MZF) were coated with amphiphilic star-block copolymeric micelles and modified with Aβ-specific probe Pittsburgh compound B (PiB) to construct a novel magnetic nanoparticle MZF-PiB, which specifically targeted amyloid plaques. Transmission electron microscope was used to study the morphological features of MZF-PiB...
November 7, 2017: Zhonghua Yi Xue za Zhi [Chinese medical journal]
https://www.readbyqxmd.com/read/29140800/glassy-magnetic-ground-state-and-kondo-like-behaviour-in-mn10fege8-alloy
#16
S Pramanick, P Dutta, S Majumdar, S Chatterjee
We report a detailed investigation of the ground-state magnetic properties of newly synthesized [Formula: see text] [Formula: see text] alloy. The sample can be thought of being derived by substituting one Mn atom by Fe of the parent compound [Formula: see text] [Formula: see text]. Fe-substitution leads to a drastic change in the magnetic ground state as well as to the magneto-transport properties of the parent alloy. On cooling below 250 K, [Formula: see text] [Formula: see text] undergoes a transition from paramagnetic phase to a state having significant ferromagnetic correlations...
November 15, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29140390/a-carboxylated-graphene-nanodisks-glucose-oxidase-nanotags-and-mn-cds-tio2-matrix-based-dual-signal-amplification-strategy-for-ultrasensitive-photoelectrochemical-detection-of-tumor-markers
#17
Jie Song, Shuo Wu, Xinlan Yang, Jingli Yuan
Graphene nanodisks with good conductivity and plenty of edge sites were synthesized to load glucose oxidase (GRD-GOD) and coupled with a Mn(2+) doped CdS quantum dot (QD) modified TiO2 electrode (CdS:Mn/TiO2) for a highly sensitive photoelectrochemical (PEC) immunoassay. The specific immune-recognition behaviour can bring the GRD-GOD labelled antigen into the antibody immobilized CdS:Mn/TiO2 interface and dramatically enhance the photocurrent response via a dual signal amplification strategy. First, graphene nanodisks with a strong electron transfer capacity can improve the conductivity of both the insulating protein layers and the CdS:Mn/TiO2 matrix, thus facilitating the regeneration of trapped carriers and hot electrons in the CdS:Mn QD films and enhancing the PEC performance...
November 15, 2017: Analyst
https://www.readbyqxmd.com/read/29140287/interaction-between-diethyldithiocarbamate-and-cu-ii-on-gold-in-non-cyanide-wastewater
#18
Nguyễn Hoàng Ly, Thanh Danh Nguyen, Kyung-Duk Zoh, Sang-Woo Joo
A surface-enhanced Raman scattering (SERS) detection method for environmental copper ions (Cu(2+)) was developed according to the vibrational spectral change of diethyldithiocarbamate (DDTC) on gold nanoparticles (AuNPs). The ultraviolet-visible (UV-Vis) absorption spectra indicated that DDTC formed a complex with Cu(2+), showing a prominent peak at ~450 nm. We found Raman spectral changes in DDTC from ~1490 cm(-1) to ~1504 cm(-1) on AuNPs at a high concentration of Cu(2+) above 1 μM. The other ions of Zn(2+), Pb(2+), Ni(2+), NH₄⁺, Mn(2+), Mg(2+), K⁺, Hg(2+), Fe(2+), Fe(3+), Cr(3+), Co(2+), Cd(2+), and Ca(2+) did not produce such spectral changes, even after they reacted with DDTC...
November 15, 2017: Sensors
https://www.readbyqxmd.com/read/29140261/proximate-composition-and-nutritional-value-of-three-macroalgae-ascophyllum-nodosum-fucus-vesiculosus-and-bifurcaria-bifurcata
#19
José M Lorenzo, Rubén Agregán, Paulo E S Munekata, Daniel Franco, Javier Carballo, Selin Şahin, Ramón Lacomba, Francisco J Barba
Proximate composition (moisture, protein, lipid and ash content) and nutritional value (fatty acid, amino acid and mineral profile) of three macroalgae (Ascophyllum nodosum, Fucus vesiculosus and Bifurcaria bifurcate) were studied. Chemical composition was significantly (p < 0.001) different among the three seaweeds. In this regard, the B. bifurcata presented the highest fat content (6.54% of dry matter); whereas, F. vesiculosus showed the highest protein level (12.99% dry matter). Regarding fatty acid content, the polyunsaturated fatty acids (PUFAs) were the most abundant followed by saturated fatty acids (SFAs) and monounsaturated fatty acids (MUFAs)...
November 15, 2017: Marine Drugs
https://www.readbyqxmd.com/read/29139512/bright-type-ii-photoluminescence-from-mn-doped-cds-znse-zns-quantum-dots-with-mn-2-ions-as-exciton-couplers
#20
Ruilin Xu, Chen Liao, Yanqing Xu, Chunfeng Zhang, Min Xiao, Lei Zhang, Changgui Lu, Yiping Cui, Jiayu Zhang
Mn(2+) ions were introduced as exciton couplers to enhance the quantum yield (QY) of type-II photoluminescence (PL) from CdS/ZnSe/ZnS quantum dots (QDs) with slow hot-exciton cooling and low radiative rate. Transient absorption spectroscopy verifies the faster bleach recovery and faster peak red-shifting at the charge-transfer state. And the transient PL peak of the QDs changes from blue-shifting to red-shifting due to Mn(2+) doping. The QY of type-II PL can be enhanced from ∼35% to ∼60% by Mn(2+) doping...
November 15, 2017: Nanoscale
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