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https://www.readbyqxmd.com/read/28732394/surface-charge-effects-on-the-electro-orientation-of-insulating-boron-nitride-nanotubes-in-aqueous-suspension
#1
Semih Cetindag, Bishnu Tiwari, Dongyan Zhang, Yoke Khin Yap, Sangil Kim, Jerry W Shan
The alignment of hexagonal boron-nitride nanotubes (BNNTs) in aqueous KCl solutions under spatially uniform electric fields was examined experimentally, using direct optical visualization to probe the orientation dynamics of individual BNNTs for different electric-field frequencies. Different from most previously studied nanowires and nanotubes, BNNTs are wide-bandgap materials which are essentially insulating at room temperature. We analyze the electro-orientation of BNNTs in the general context of polarizable cylindrical particles in liquid suspensions, whose behavior can fall into different regimes, including alignment due to Maxwell-Wagner induced dipoles at high frequencies, and alignment due to fluid motion of the electrical double layer around the particles at lower frequencies...
May 29, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28732284/field-free-molecular-orientation-by-delayed-elliptically-polarised-laser%C3%A2-pulses
#2
Anjali Maan, Ashish Tyagi, Vinod Prasad
A theoretical model of NAREX (non-adiabatic rotational excitation) and field-free molecular orientation by a short specific elliptically polarised laser pulses (EPLPs) driving a polar molecule is presented. By choosing the proper value of elliptically polarised field parameters, efficient field-free orientation could be achieved. It is demonstrated that NAREX can be controlled by various laser parameters, out of which pulse shape plays the most significant role. The effect of elliptic parameter on the rotational excitation and orientation dynamics is also under concern...
July 13, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28732126/chinese-isms-dimensions-in-mainland-china-and-taiwan-convergence-and-extension-of-american-isms-dimensions
#3
Zhuo Job Chen, Kung-Yu Hsu, Xinyue Zhou, Gerard Saucier
OBJECTIVE: Previous studies of American-English isms terms have uncovered as many as five broad factors: Tradition-oriented Religiousness (TR), Subjective Spirituality (SS), Communal Rationalism (CR), Unmitigated Self-Interest (USI), and Inequality Aversion (IA). The present studies took a similar lexical approach to investigate the Chinese-language isms structures in both mainland China and Taiwan. METHOD AND RESULTS: In Study 1, exploratory factor analyses with 915 mainland Chinese subjects uncovered four interpretable factors dimensionalizing 165 mainland Chinese dictionary isms terms...
July 21, 2017: Journal of Personality
https://www.readbyqxmd.com/read/28732020/setting-strategy-of-delay-optimization-oriented-smac-contention-window-size
#4
Yuan Rao, Cheng Deng, Jun Su, Yan Qiao, Jun Zhu, Ru-Chuan Wang
Some frame components, such as SYNC (frame synchronization) and RTS/CTS (Ready to Send/Clear to Send), are not taken into consideration when the traditional setting strategies conduct the optimization of SMAC (Sensor MAC) contention window size. This paper proposes mathematical models that allow the analysis of data packets forwarding delay within one SMAC virtual cluster. Simulation results in OMNeT++ show good agreements with the proposed mathematical models, validating the models' correctness. The curve analyses of the models confirm the existence of delay-optimization-oriented contention window size that is closely related to the number of simultaneously contending nodes...
2017: PloS One
https://www.readbyqxmd.com/read/28731771/colloidal-spherocylinders-at-an-interface-flipper-dynamics-and-bilayer-formation
#5
T Li, G Brandani, D Marenduzzo, P S Clegg
We study the response of a film of colloidal spherocylinders to compression by combining pressure-area isotherm measurements, microscopy, and computer simulations. We find that the behavior of the film depends strongly on the geometry of the particles. For a small aspect ratio, a uniform monolayer forms and then buckles. For a higher aspect ratio, particles flip to orient perpendicular to the interface; we show that flipping occurs in locations where the nematic ordering is low. Our experiments and simulations further demonstrate that the longest particles rearrange to self-assemble a colloidal bilayer, which is stable due to the unique geometry of spherocylinders at an interface...
July 7, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28731769/first-principles-prediction-of-spin-polarized-multiple-dirac-rings-in-manganese-fluoride
#6
Yalong Jiao, Fengxian Ma, Chunmei Zhang, John Bell, Stefano Sanvito, Aijun Du
Spin-polarized materials with Dirac features have sparked great scientific interest due to their potential applications in spintronics. But such a type of structure is very rare and none has been fabricated. Here, we investigate the already experimentally synthesized manganese fluoride (MnF_{3}) as a novel spin-polarized Dirac material by using first-principles calculations. MnF_{3} exhibits multiple Dirac cones in one spin orientation, while it behaves like a large gap semiconductor in the other spin channel...
July 7, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28731734/determining-potentials-of-zero-charge-of-metal-electrodes-versus-the-standard-hydrogen-electrode-from-density-functional-theory-based-molecular-dynamics
#7
Jiabo Le, Marcella Iannuzzi, Angel Cuesta, Jun Cheng
We develop a computationally efficient scheme to determine the potentials of zero charge (PZC) of metal-water interfaces with respect to the standard hydrogen electrode. We calculate the PZC of Pt(111), Au(111), Pd(111) and Ag(111) at a good accuracy using this scheme. Moreover, we find that the interface dipole potentials are almost entirely caused by charge transfer from water to the surfaces, the magnitude of which depends on the bonding strength between water and the metals, while water orientation hardly contributes at the PZC conditions...
July 7, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28731519/citizen-s-charter-in-a-primary-health-care-setting-of-nepal-an-accountability-tool-or-a-mere-wall-poster
#8
Gagan Gurung, Robin Gauld, Philip C Hill, Sarah Derrett
BACKGROUND: Despite some empirical findings on the usefulness of citizen's charters on awareness of rights and services, there is a dearth of literature about charter implementation and impact on health service delivery in low-income settings. OBJECTIVE: To gauge the level of awareness of the Charter within Nepal's primary health-care (PHC) system, perceived impact and factors affecting Charter implementation. METHOD: Using a case study design, a quantitative survey was administered to 400 participants from 22 of 39 PHC facilities in the Dang District to gauge awareness of the Charter...
July 21, 2017: Health Expectations: An International Journal of Public Participation in Health Care and Health Policy
https://www.readbyqxmd.com/read/28731437/computerized-cognitive-screen-cocosc-a-self-administered-computerized-test-for-screening-for-cognitive-impairment-in-community-social-centers
#9
Adrian Wong, Ching-Hang Fong, Vincent Mok, Kam Tat Leung, Raymond Kai-Yu Tong
BACKGROUND: Computerized cognitive tests may serve as a preliminary, low-cost method to identify individuals with suspected cognitive impairment in the community. OBJECTIVE: To develop a self-administered computerized test, namely the "Computerized Cognitive Screen (CoCoSc), Hong Kong version", for screening of individuals with cognitive impairment (CI) in community settings. METHODS: The CoCoSc is a 15-min computerized cognitive screen covering memory, executive functions, orientation, attention and working memory, and prospective memory administered on a touchscreen computer...
July 19, 2017: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/28731303/lead-ii-binding-in-natural-and-artificial-proteins
#10
Virginia Cangelosi, Leela Ruckthong, Vincent L Pecoraro
This article describes recent attempts to understand the biological chemistry of lead using a synthetic biology approach. Lead binds to a variety of different biomolecules ranging from enzymes to regulatory and signaling proteins to bone matrix. We have focused on the interactions of this element in thiolate-rich sites that are found in metalloregulatory proteins such as Pbr, Znt, and CadC and in enzymes such as δ-aminolevulinic acid dehydratase (ALAD). In these proteins, Pb(II) is often found as a homoleptic and hemidirectic Pb(II)(SR)3- complex...
April 10, 2017: Metal Ions in Life Sciences
https://www.readbyqxmd.com/read/28731208/super-strong-super-stiff-macrofibers-with-aligned-long-bacterial-cellulose-nanofibers
#11
Sha Wang, Feng Jiang, Xu Xu, Yudi Kuang, Kun Fu, Emily Hitz, Liangbing Hu
With their impressive properties such as remarkable unit tensile strength, modulus, and resistance to heat, flame, and chemical agents that normally degrade conventional macrofibers, high-performance macrofibers are now widely used in various fields including aerospace, biomedical, civil engineering, construction, protective apparel, geotextile, and electronic areas. Those macrofibers with a diameter of tens to hundreds of micrometers are typically derived from polymers, gel spun fibers, modified carbon fibers, carbon-nanotube fibers, ceramic fibers, and synthetic vitreous fibers...
July 21, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28731030/cryo-em-structure-and-biochemical-analysis-reveal-the-basis-of-the-functional-difference-between-human-pi3kc3-c1-and-c2
#12
Meisheng Ma, Jun-Jie Liu, Yan Li, Yuwei Huang, Na Ta, Yang Chen, Hua Fu, Ming-Da Ye, Yuehe Ding, Weijiao Huang, Jia Wang, Meng-Qiu Dong, Li Yu, Hong-Wei Wang
Phosphatidylinositol 3-phosphate (PI3P) plays essential roles in vesicular trafficking, organelle biogenesis and autophagy. Two class III phosphatidylinositol 3-kinase (PI3KC3) complexes have been identified in mammals, the ATG14L complex (PI3KC3-C1) and the UVRAG complex (PI3KC3-C2). PI3KC3-C1 is crucial for autophagosome biogenesis, and PI3KC3-C2 is involved in various membrane trafficking events. Here we report the cryo-EM structures of human PI3KC3-C1 and PI3KC3-C2 at sub-nanometer resolution. The two structures share a common L-shaped overall architecture with distinct features...
July 21, 2017: Cell Research
https://www.readbyqxmd.com/read/28730943/collective-in-exile-utilizing-terror-management-theory-to-understand-women-s-wailing-performance
#13
Tova Gamliel
Although women's wailing at death rites in various cultures typically amplifies mortality salience, this ritual phenomenon is absent in the research literature on terror management theory (TMT). This study explored Yemenite-Jewish wailing in Israel as an example of how a traditional performance manages death anxiety in a community context. Observations of wailing events and interviews with Yemenite-Jewish wailers and mourners in Israel were analyzed to understand respondents' perceptions of the experience of wailing as well as the anxiety-oriented psychotherapeutic expertise involved...
January 1, 2017: Transcultural Psychiatry
https://www.readbyqxmd.com/read/28730557/extrinsic-religious-orientation-and-disordered-eating-pathology-among-modern-orthodox-israeli-adolescents-the-mediating-role-of-adherence-to-the-superwoman-ideal-and-body-dissatisfaction
#14
Sarah L Weinberger-Litman, Yael Latzer, Leib Litman, Rachel Ozick
The role of religious and spiritual factors has been recognized with regard to risk factors for disordered eating pathology (DEP). Specifically, religious orientation, or underlying religious motivation, has been associated with DEP among a variety of religious groups. Extrinsic religious orientation has consistently been found to be associated with increased levels of DEP among Christians and Jews in the USA. However, this paradigm has not been investigated cross-culturally. The current study is the first to examine the association of extrinsic religious orientation and DEP among Modern Orthodox Israeli adolescents...
July 20, 2017: Journal of Religion and Health
https://www.readbyqxmd.com/read/28729809/on-the-rotation-of-teleseismic-seismograms-based-on-the-receiver-function-technique
#15
M Wilde-Piórko, M Grycuk, M Polkowski, M Grad
The receiver function (RF) technique is a well-established method to investigate the crustal and upper mantle structures based on three-component seismograms of teleseismic events. In the present study, we propose a modified automatic procedure to determine the back azimuth and polarization angles of a teleseismic event based on the RF technique. The method is tested for the recording of 3 permanent and 3 temporary broadband seismic stations located in the vicinity of Poland. Additionally, the analysis of Rayleigh wave polarization is conducted to show that the new procedure is not sensitive to incorrect seismometer orientation...
2017: Journal of Seismology
https://www.readbyqxmd.com/read/28729744/attitudes-towards-social-oocyte-freezing-from-a-socio-cultural-perspective
#16
Maren Schick, Réka Sexty, Beate Ditzen, Tewes Wischmann
INTRODUCTION: The tendency to delay parenthood is increasing. It is partly driven by the availability of early reproductive technologies such as social oocyte freezing, the cryopreservation of oocytes for non-medical purposes. The goal of this study was to investigate relationships between attitudes towards social oocyte freezing and different socio-cultural backgrounds in a German sample cohort. MATERIALS AND METHODS: A quantitative online questionnaire was compiled...
July 2017: Geburtshilfe und Frauenheilkunde
https://www.readbyqxmd.com/read/28729715/inflammatory-monocytes-regulate-th1-oriented-immunity-to-cpg-adjuvanted-protein-vaccines-through-production-of-il-12
#17
S De Koker, L Van Hoecke, A De Beuckelaer, K Roose, K Deswarte, M A Willart, P Bogaert, T Naessens, B G De Geest, X Saelens, B N Lambrecht, J Grooten
Due to their capacity to skew T cell responses towards Th1 oriented immunity, oligonucleotides containing unmethylated CpG motifs (CpG) have emerged as interesting adjuvants for vaccination. Whereas the signalling pathways in response to CpG mediated TLR9 activation have been extensively documented at the level of the individual cell, little is however known on the precise identity of the innate immune cells that govern T cell priming and polarisation to CpG adjuvanted protein antigens in vivo. In this study, we demonstrate that optimal induction of Th1 oriented immunity to CpG adjuvanted protein vaccines requires the coordinated actions of conventional DCs and of monocytes...
July 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28729584/using-virtual-microscopy-to-deliver-an-integrated-oral-pathology-course-for-undergraduate-dental-students
#18
D J Brierley, P M Speight, K D Hunter, P Farthing
Dental students in the United Kingdom usually study histopathology as part of their undergraduate curriculum and this has traditionally been delivered using light microscopes in laboratory classes. Beginning in 2005, the oral pathology course in Sheffield was gradually modified by the introduction of virtual microscopy with a focus on creating a more integrated, clinically orientated and dynamic approach to student teaching and learning in histopathology. The purpose of this paper is to describe how virtual microscopy has been used to enhance dental students' learning of oral pathology, and its role in facilitating an integrated oral disease curriculum in Sheffield...
July 21, 2017: British Dental Journal
https://www.readbyqxmd.com/read/28729513/bidirectional-eukaryotic-dna-replication-is-established-by-quasi-symmetrical-helicase-loading
#19
Gideon Coster, John F X Diffley
Bidirectional replication from eukaryotic DNA replication origins requires the loading of two ring-shaped minichromosome maintenance (MCM) helicases around DNA in opposite orientations. MCM loading is orchestrated by binding of the origin recognition complex (ORC) to DNA, but how ORC coordinates symmetrical MCM loading is unclear. We used natural budding yeast DNA replication origins and synthetic DNA sequences to show that efficient MCM loading requires binding of two ORC molecules to two ORC binding sites...
July 21, 2017: Science
https://www.readbyqxmd.com/read/28729352/optical-imaging-of-surface-chemistry-and-dynamics-in-confinement
#20
Carlos Macias-Romero, Igor Nahalka, Halil I Okur, Sylvie Roke
We imaged the interfacial structure and dynamics of water in a microscopically confined geometry in three dimensions and on millisecond time scales with a 3D structurally illuminated wide-field second harmonic microscope. Image contrast reports on the orientational order of interfacial water, induced by charge-dipole interactions between water molecules and surface charges. The images were converted into surface potential maps. Spatially resolved surface acid dissociation constant pKa,s values were determined for the silica deprotonation reaction by following pH induced chemical changes on the curved and confined surfaces of a glass micro-capillary immersed in aqueous solutions...
July 20, 2017: Science
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