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Y-J Chen, Kh Zakeri, A Ernst, H J Qin, Y Meng, J Kirschner
Quantum confinement permits the existence of multiple terahertz magnon modes in atomically engineered ultrathin magnetic films and multilayers. By means of spin-polarized high-resolution electron energy-loss spectroscopy, we report on the direct experimental detection of all exchange-dominated terahertz confined magnon modes in a 3 ML Co film. We demonstrate that, by tuning the structural and magnetic properties of the Co film, through its epitaxial growth on different surfaces, e.g., Ir(001), Cu(001), and Pt(111), one can achieve entirely different in-plane magnon dispersions, characterized by positive and negative group velocities...
December 29, 2017: Physical Review Letters
Md Ghulam Saber, Yun Wang, Eslam El-Fiky, David Patel, Kh Arif Shahriar, Md Samiul Alam, Maxime Jacques, Zhenping Xing, Luhua Xu, Nicolás Abadía, David V Plant
We design and demonstrate Fabry-Perot resonators with transverse coupling using Bragg gratings as reflectors on the silicon-on-insulator (SOI) platform. The effects of tailoring the cavity length and the coupling coefficient of the directional coupler on the spectral characteristics of the device are studied. The fabricated resonators achieved an extinction ratio (ER) of 37.28 dB and a Q-factor of 3356 with an effective cavity length of 110 μm, and an ER of 8.69 dB and a Q-factor of 23642 with a 943 μm effective cavity length...
January 1, 2018: Optics Letters
Seyed Mojtaba Hosseini, Mahsa Sani, Kh Husnanin Haider, Mohammadreza Dorvash, Seyyed Mohyeddin Ziaee, Aliasghar Karimi, Mohmmad Reza Namavar
with neural stem cells (NSCs) provides a hope to recover the neural damage and compensate for the lost neural structures for restoration of interrupted neural communications above and below the site of injury. However, cell-based therapy approach suffers from many biological barriers and technical caveats which severely hamper the prognosis. The biochemically-rich microenvironment at the site of spinal cord injury (SCI), the continuing neuro-degenerative process and infiltrating immune cells offer a serious barrier to the donor cells...
January 6, 2018: Neuroscience Letters
(no author information available yet)
Mayer KH, Loo S, Crawford PM, et al. Excess clinical comorbidity among HIV-infected patients accessing primary care in US community health centers. Public Health Rep. 2018;133:109-118. (Original DOI: 10.1177/0033354917748670) In the above referenced article, Table 3 was published with duplicate information in the initial OnlineFirst version. The correct Table 3 is given below. The article, as published in volume 133, issue 1, reflects the corrected table. [Table: see text].
January 2018: Public Health Reports
P P Knox, E P Lukashev, N Kh Seifullina, V V Gorokhov, A B Rubin
The effect of heating at 65°C for 20 min on the absorption spectra and kinetics of the dark recombination of charges separated between photoactive bacteriochlorophyll and quinone acceptors was studied in dry films of bacterial photosynthetic reaction centers (RCs), RC films in polyvinyl alcohol, and trehalose. A pronounced protective effect of trehalose against pheophytinizaiton of molecules bacteriochlorophylls in RC structure and in maintaining their higher photochemical activity was found.
November 2017: Doklady. Biochemistry and Biophysics
Augustine Kh Tee
No abstract text is available yet for this article.
November 2017: Annals of the Academy of Medicine, Singapore
Pavel Mokrejš, Matouš Huťťa, Jana Pavlačková, Pavlína Egner
Keratin hydrolysates (KHs) are established standard components in hair cosmetics. Understanding the moisturizing effects of KH is advantageous for skin-care cosmetics. The goals of the protocol are: (1) to process chicken feathers into KH by alkaline-enzymatic hydrolysis and purify it by dialysis, and (2) to test if adding KH into an ointment base (OB) increases hydration of the skin and improves skin barrier function by diminishing transepidermal water loss (TEWL). During alkaline-enzymatic hydrolysis feathers are first incubated at a higher temperature in an alkaline environment and then, under mild conditions, hydrolyzed with proteolytic enzyme...
November 27, 2017: Journal of Visualized Experiments: JoVE
G Kh Musaev, A S Fatyanova, V V Levkin
No abstract text is available yet for this article.
2017: Khirurgiia
Z B Khalilov, A Yu Kalinichenko, R Kh Azimov, I S Panteleyeva, F S Kurbanov
No abstract text is available yet for this article.
2017: Khirurgiia
Shuopeng Liu, Wenqiong Su, Yulong Li, Lulu Zhang, Xianting Ding
DNA hydrogel garnered increasing attention in the sensing and medical field owing to its native biocompatibility and mechanical stability. While electrochemistry serves as a quantitative and sensitive detection technique, electrochemical DNA hydrogel biosensor is rarely reported. Here, for the first time, we report an electrochemical biosensor based on hybrid DNA hydrogel immobilized on indium tin oxide/polyethylene terephthalate (ITO/PET) electrode for the detection of lung cancer-specific microRNA, miR-21...
December 19, 2017: Biosensors & Bioelectronics
Etienne A LaPierre, Marissa L Clapson, Warren E Piers, Laurent Maron, Denis M Spasyuk, Chris Gendy
Three PCsp3P pincer ligands differing in the aryl group linking the phosphine arms with the anchoring carbon donor were used to support square planar Ni(II) bromide complexes 1-3Br. Exchange of the coordinating bromide anion for the more weakly coordinating triflate (OTf) or hexafluoroantimonate (SbF6) anions was accomplished by treatment with AgX or TlX salts to give compounds 1-3X; compounds 1OTf, 1SbF6, 2Br, 2OTf, 3Br, and 3SbF6 were all characterized by X-ray crystallography. The reactions of these Ni(II) compounds with the amine-N-oxide oxygen atom transfer agents ONMe3 and ONMePh2 were explored...
December 20, 2017: Inorganic Chemistry
Xiao Chen, Michael T Gamer, Peter W Roesky
The aminoarsane Mes2AsN(H)Ph was prepared from Mes2AsCl and aniline in good yields. Deprotonation of Mes2AsN(H)Ph with suitable alkali metal bases resulted in the corresponding alkali metal derivatives. Thus, reaction of Mes2AsN(H)Ph with nBuLi, NaN(SiMe3)2, or KH gave the metal complexes [(Mes2AsNPh){Li(OEt2)2}], [(Mes2AsNPh){Na(OEt2)}]2, and [(Mes2AsNPh){K(THF)}]2. These are the first metal complexes ligated by an arsinoamide. All solid-state structures were established by single crystal X-ray diffraction...
December 20, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
Kh M Diab, A Yu Vasilyev, V N Sokolova
The objective of the present work was to overview the currently available literature publications dealing with the radiodiagnostic techniques applied to evaluate the position of the electrode array used for the purpose of cochlear implantation surgery including both the conventional methods and the recently proposed approaches. It is shown that the intraoperative control guarantees the timely identification of the possible complications and should meet both the safety criteria and the requirements for obtaining high-quality images and intraoperative usability of the surgical instruments being employed...
2017: Vestnik Otorinolaringologii
N A Daikhes, Kh M Diab, A R Siraeva, N V Tarasova, D S Kondratchikov, A S Machalov, O A Pashchinina, A O Kuznetsov, K D Yusifov
The objective of the present study was the prospective analysis of the results of bilateral cochlear implantation (CI) in the children presenting with bilateral ossification of the cochlea after they had survived meningitis. A total of 15 patients underwent the surgical intervention. In those exhibiting bilateral ossification of the basal cochlear helix over the 5 mm segment (up to first bend of the cochlear turn) and partial ossification of the second helix (in 6 children), the affected portions were removed with the placement of two choleostomies, the lower one (from the ossified membrane of the cochlear window) and the upper one (toward the second helix)...
2017: Vestnik Otorinolaringologii
V A Chavushyan, K V Simonyan, R M Simonyan, A S Isoyan, G M Simonyan, M A Babakhanyan, L E Hovhannisyian, Kh H Nahapetyan, L G Avetisyan, M A Simonyan
BACKGROUND: Excess dietary fructose intake associated with metabolic syndrome and insulin resistance and increased risk of developing type 2 diabetes. Previous animal studies have reported that diabetic animals have significantly impaired behavioural and cognitive functions, pathological synaptic function and impaired expression of glutamate receptors. Correction of the antioxidant status of laboratory rodents largely prevents the development of fructose-induced plurimetabolic changes in the nervous system...
December 19, 2017: BMC Complementary and Alternative Medicine
Ke Hu, Renato N Sampaio, Seth L Marquard, M Kyle Brennaman, Yusuke Tamaki, Thomas J Meyer, Gerald J Meyer
Described herein is a photochemical approach to the generation of a high-valent metal-oxo species that utilizes a chromophore or "sensitizer", a semiconducting electron acceptor, and a redox buffer that poises a catalyst's initial protonation and oxidation state. The photoexcited sensitizer injects an electron into the semiconductor and then oxidizes the catalyst whose reactivity occurs in kinetic competition with back electron transfer. Core-shell SnO2/TiO2 semiconductor nanocrystallites inhibited charge recombination relative to TiO2 acceptors...
December 18, 2017: Inorganic Chemistry
Qing Gao, JingYi Zhao, Zixuan Fan, Jiadi Bao, Dawei Sun, Huhu Li, Chun Sun, Xijuan Jiang
Mitochondrial permeability transition pore (MPTP) opening is the main culprit of ischemic/reperfusion (IR) injury. It is reported that c-subunit of ATP synthase is the core component of MPTP. Danshensu (DSS), a monomer isolated from the traditional Chinese herb Danshen, has showed cardioprotective effect against IR injury through unknown mechanism. In this study, rat hearts were suspended in Langendorff instrument and perfused with Krebs-Henseleit (KH) buffer containing DSS for 60 minutes, followed by 30 minutes of global ischemia...
2017: Evidence-based Complementary and Alternative Medicine: ECAM
Stanley Py Siu, Wilson Kc Leung, Polly Sc Wan, Eric Kh Liu, Christopher Wk Lai
Objective To investigate the potential correlation between sonographically measured mesenteric fat thickness (MFT) and brachial artery flow-mediated dilation (FMD) in a sample of healthy Chinese male young adults. Methods Healthy male participants were recruited from Hong Kong Polytechnic University for this prospective observational study. The physical activity readiness questionnaire and ultrasound measurements of carotid intima media thickness were used to screen for clinically healthy subjects. MFT and brachial artery FMD were measured by ultrasound, and body mass index (BMI) was recorded...
January 1, 2017: Journal of International Medical Research
Dariusz Sarzynski, Łukasz Fojcik, Zdzislaw Latajka
The overall rate constants for H-abstraction (kH) from CH3CHClCH3 and D-abstraction (kD) from CD3CDClCD3 by chlorine atoms in the temperature range of 298-528.5 K were determined and are described by the expressions: kH = (3.52 ±0.21)×10-11 exp(-184 ±19/T) cm3molecule-1s-1 and kD = (1.91 ±0.16)×10-11 exp(-185 ±31/T) cm3molecule-1s-1 respectively. The results of the experiment show that the value of the kinetic isotope effect (kH/kD) for the overall rate constants is temperature independent and is equal to 1...
December 13, 2017: Journal of Physical Chemistry. A
V V Gorokhov, P P Knox, B N Korvatovskiy, N Kh Seifullina, S N Goryachev, V Z Paschenko
The temperature dependences of tryptophan fluorescence decay kinetics in aqueous glycerol and 1 M trehalose solutions were examined. The fluorescence decay kinetics were recorded in the spectral region of 292.5-417.5 nm with nanosecond time resolution. The kinetics curves were approximated by the sum of three exponential terms, and the spectral distribution (DAS) of these components was determined. An antisymbatic course of fluorescence decay times of two (fast and medium) components in the temperature range from -60 to +10°C was observed...
November 2017: Biochemistry. Biokhimii︠a︡
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