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https://www.readbyqxmd.com/read/28102358/model-for-large-area-monolayer-coverage-of-polystyrene-nanospheres-by-spin-coating
#1
Abhishek Chandramohan, Nikolai V Sibirev, Vladimir G Dubrovskii, Michael C Petty, Andrew J Gallant, Dagou A Zeze
Nanosphere lithography, an inexpensive and high throughput technique capable of producing nanostructure (below 100 nm feature size) arrays, relies on the formation of a monolayer of self-assembled nanospheres, followed by custom-etching to produce nanometre size features on large-area substrates. A theoretical model underpinning the self-ordering process by centrifugation is proposed to describe the interplay between the spin speed and solution concentration. The model describes the deposition of a dense and uniform monolayer by the implicit contribution of gravity, centrifugal force and surface tension, which can be accounted for using only the spin speed and the solid/liquid volume ratio...
January 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28102222/p-wave-triggered-superconductivity-in-single-layer-graphene-on-an-electron-doped-oxide-superconductor
#2
A Di Bernardo, O Millo, M Barbone, H Alpern, Y Kalcheim, U Sassi, A K Ott, D De Fazio, D Yoon, M Amado, A C Ferrari, J Linder, J W A Robinson
Electron pairing in the vast majority of superconductors follows the Bardeen-Cooper-Schrieffer theory of superconductivity, which describes the condensation of electrons into pairs with antiparallel spins in a singlet state with an s-wave symmetry. Unconventional superconductivity was predicted in single-layer graphene (SLG), with the electrons pairing with a p-wave or chiral d-wave symmetry, depending on the position of the Fermi energy with respect to the Dirac point. By placing SLG on an electron-doped (non-chiral) d-wave superconductor and performing local scanning tunnelling microscopy and spectroscopy, here we show evidence for a p-wave triggered superconducting density of states in SLG...
January 19, 2017: Nature Communications
https://www.readbyqxmd.com/read/28101862/crystallographic-studies-of-intermediate-filament-proteins
#3
Dmytro Guzenko, Anastasia A Chernyatina, Sergei V Strelkov
Intermediate filaments (IFs), together with microtubules and actin microfilaments, are the three main cytoskeletal components in metazoan cells. IFs are formed by a distinct protein family, which is made up of 70 members in humans. Most IF proteins are tissue- or organelle-specific, which includes lamins, the IF proteins of the nucleus. The building block of IFs is an elongated dimer, which consists of a central α-helical 'rod' domain flanked by flexible N- and C-terminal domains. The conserved rod domain is the 'signature feature' of the IF family...
2017: Sub-cellular Biochemistry
https://www.readbyqxmd.com/read/28101340/pseudo-continuous-arterial-spin-labeling-imaging-of-cerebral-blood-perfusion-asymmetry-in-drug-na%C3%A3-ve-patients-with-first-episode-major-depression
#4
Guangdong Chen, Haiman Bian, Deguo Jiang, Mingwei Cui, Shengzhang Ji, Mei Liu, Xu Lang, Chuanjun Zhuo
Many previous studies have reported that regional cerebral blood flow (rCBF) aberrations may be one of the pathological characteristics of depression and rCBF has demonstrated a certain degree of asymmetry. However, studies investigating the cerebral blood perfusion asymmetry changes of drug-naïve patients experiencing their first episode of major depression using pseudo-continuous arterial spin labeling (pCASL) are rare. Ten drug-naïve patients experiencing their first major depression episode and 15 healthy volunteers were enrolled in the current study...
December 2016: Biomedical Reports
https://www.readbyqxmd.com/read/28100783/dual-functional-roles-of-molecular-beacon-a-microrna-detector-and-inhibitor
#5
Wai Ming Li, Ching-Man Chan, Andrew L Miller, Chow H Lee
MicroRNAs are essential in many cellular processes. The ability to detect microRNAs is important for understanding its function and biogenesis. This study is aimed at using a molecular beacon to detect miR-430 in developing zebrafish embryos as a proof of principle. miR-430 is crucial for the clearance of maternal mRNA during maternal zygotic transition (MZT) in embryonic development. Despite its known function, the temporal and spatial expression of miR-430 remains unclear. We used various imaging techniques, including laser scanning confocal microscopy, spinning disk and lightsheet microscopy, to study the localization of miR-430 and any developmental defects possibly caused by the molecular beacon...
January 18, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28100406/modeling-of-path-planning-and-needle-steering-with-path-tracking-in-anatomical-soft-tissues-for-minimally-invasive-surgery
#6
Pan Li, Shan Jiang, Dong Liang, Zhiyong Yang, Yan Yu, Wei Wang
Steerable needles can potentially improve the effectiveness of diagnostic and therapeutic procedures, such as biopsy and cancer treatment, by increasing the targeting accuracy and reaching previously inaccessible targets. A discrete potential field algorithm based on three dimensional (3D) anatomical structures is proposed in this paper to plan the needle path in minimally invasive surgery. A 3D kinematic model of needle steering is formulated using Lie group theory. Model parameters are fitted using experimental data acquired via a 2-degree of freedom robotic device and an ultrasound imaging device...
January 16, 2017: Medical Engineering & Physics
https://www.readbyqxmd.com/read/28100166/smite-an-r-bioconductor-package-that-identifies-network-modules-by-integrating-genomic-and-epigenomic-information
#7
N Ari Wijetunga, Andrew D Johnston, Ryo Maekawa, Fabien Delahaye, Netha Ulahannan, Kami Kim, John M Greally
BACKGROUND: The molecular assays that test gene expression, transcriptional, and epigenetic regulation are increasingly diverse and numerous. The information generated by each type of assay individually gives an insight into the state of the cells tested. What should be possible is to add the information derived from separate, complementary assays to gain higher-confidence insights into cellular states. At present, the analysis of multi-dimensional, massive genome-wide data requires an initial pruning step to create manageable subsets of observations that are then used for integration, which decreases the sizes of the intersecting data sets and the potential for biological insights...
January 18, 2017: BMC Bioinformatics
https://www.readbyqxmd.com/read/28099451/drawbacks-of-dialysis-procedures-for-removal-of-edta
#8
Andreia Mónico, Eva Martínez-Senra, F Javier Cañada, Silvia Zorrilla, Dolores Pérez-Sala
Ethylenediaminetetraacetic acid (EDTA) is a chelating agent commonly used in protein purification, both to eliminate contaminating divalent cations and to inhibit protease activity. For a number of subsequent applications EDTA needs to be exhaustively removed. Most purification methods rely in extensive dialysis and/or gel filtration in order to exchange or remove protein buffer components, including metal chelators. We report here that dialysis protocols, even as extensive as those typically employed for protein refolding, may not effectively remove EDTA, which is reduced only by approximately two-fold and it also persists after spin-column gel filtration, as determined by NMR and by colorimetric methods...
2017: PloS One
https://www.readbyqxmd.com/read/28099109/arterial-spin-labeling-to-predict-brain-tumor-grading-limits-of-cutoff-cerebral-blood-flow-values
#9
Bruno Law-Ye, Mathieu Schertz, Damien Galanaud, Didier Dormont, Nadya Pyatigorskaya
No abstract text is available yet for this article.
February 2017: Radiology
https://www.readbyqxmd.com/read/28099024/surface-interactions-and-confinement-of-methane-a-high-pressure-magic-angle-spinning-nmr-and-computational-chemistry-study
#10
Salim Ok, David W Hoyt, Amity Andersen, Julie Sheets, Susan A Welch, David R Cole, Karl Todd Mueller, Nancy M Washton
Characterization and modeling of the molecular-level behavior of simple hydrocarbon gases, such as methane, in the presence of both nonporous and nano-porous mineral matrices allows for predictive understanding of important processes in engineered and natural systems. In this study, changes in local electromagnetic environments of the carbon atoms in methane under conditions of high pressure (up to 130 bar) and moderate temperature (up to 346 K) were observed with 13C magic-angle spinning (MAS) NMR spectroscopy while the methane gas was mixed with two model solid substrates: a fumed non-porous, 12 nm particle size silica and a mesoporous silica with 200 nm particle size and 4 nm average pore diameter...
January 18, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28099015/intersystem-crossing-rates-of-isolated-fullerenes-theoretical-calculations
#11
Yuxiu Liu, Min-Song Lin, Yi Zhao
In our work, electronic structure calculations (reorganization energy, driving force and spin orbit coupling) and a rate theory (Marcus formula) are employed to quantitatively predict the ISC rates of isolated fullerenes Cn (n=60~110). It is found that the driving force involving the energies of excited singlet states and triplet states is not an only factor to predict the ISC rates. For instance, although C80, C82 and C110 have the favorable driving force, the ISC rates are close to zero because of small spin obit couplings, whereas small ISC rate of C96 and C100 results from quite small reorganization energies...
January 18, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28099014/a-magneto-structural-analysis-of-fe-iii-keggin-polyoxometalates
#12
Nuno A G Bandeira, Omid Sadeghi, Toby J Woods, Yuan-Zhu Zhang, Jürgen Schnack, Kim R Dunbar, May Nyman, Carles Bo
A computational study and magnetic susceptibility measurements of three homonuclear Fe(III) Keggin structures are herein presented: the [FeO4@Fe12F24(μ-OCH3)12]5- anion (1), the [Bi6{FeO4@Fe12O12(OH)12}(μ-O2CCCl3)12]+ cation (2) and its polymorph [Bi6{FeO4@Fe12O12(OH)10(H2O)2}(μ-O2CCF3)10]3+ (3). These results are contrasted with the exchange interactions present in the previously characterised [Fe6(OH)3Ge2W18O68(OH)6]11- and [H12As4Fe8W30O120(H2O)2]4- anions. The computational analysis shows that the most significant anti-ferromagnetic spin coupling takes place at the junction between each of the {Fe3O6(OH)3}/{Fe3F6(OCH3)3} framework motifs, a possibility that had been previously discarded in the literature on the basis of the Fe-Fe distances...
January 18, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28098970/strong-enhancement-of-photoelectric-conversion-efficiency-of-co-hybridized-polymer-solar-cell-by-silver-nanoplates-and-core-shell-nanoparticles
#13
Wenfei Shen, Jianguo Tang, Yao Wang, Jixian Liu, Linjun Huang, Weichao Chen, Lanlan Yang, Wei Wang, Yanxin Wang, Renqiang Yang, Jungheum Yun, Laurence A Belfiore
A new way was meticulously designed to utilize the localized surface plasmon resonance (LSPR) effect and the light scattering effect of silver nanoplate (Ag-nPl) and core-shell Ag@SiO2 nanoparticles (Ag@SiO2-NPs) to enhance the photovoltaic performances of polymer solar cells (PSCs). To prevent direct contact between silver nanoparticles (Ag-NPs) and photo-active materials which will cause electrons quenching, bare Ag-nPl were spin-coated on indium tin oxide and silica capsulated Ag-NPs were incorporated to PBDTTT-C-T:PC71BM active layer...
January 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28098463/absolute-configuration-of-native-oligomeric-proanthocyanidins-with-dentin-biomodification-potency
#14
Joo-Won Nam, Rasika S Phansalkar, David C Lankin, James B McAlpine, Ariene A Leme-Kraus, Cristina M P Vidal, Li-She Gan, Ana Bedran-Russo, Shao-Nong Chen, Guido F Pauli
The structurally complex oligomeric proanthocyanidins (OPACs) are promising biomimetic agents, capable of strengthening the macromolecular backbone of teeth via intermolecular and intermicrofibrillar cross-linking. This study establishes analytical methods capable of determining the absolute configuration of the catechin-type monomeric units of underivatized OPACs. This preserves the capacity of their biological evaluation, aimed at understanding the inevitably stereospecific interactions between the OPACs and dentin collagen...
January 18, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28098454/high-sensitive-wearable-textile-based-humidity-sensor-made-of-high-strength-single-walled-carbon-nanotube-swcnt-poly-vinyl-alcohol-pva-filaments
#15
Gengheng Zhou, Joon-Hyung Byun, Youngseok Oh, Byung-Mun Jung, Hwa-Jin Cha, Dong Gi Seong, Moon-Kwang Um, Sangil Hyun, Tsu-Wei Chou
Textile-based humidity sensors can be an important component of smart wearable electronic-textiles and have potential applications in the management of wounds, bed-wetting, and skin pathologies or for microclimate control in clothing. Here, we report a wearable textile-based humidity sensor for the first time using high strength (~750 MPa) and ultra-tough (energy-to-break, 4300 J g-1) SWCNT/PVA filaments via a wet-spinning process. The conductive SWCNT networks in the filaments can be modulated by adjusting the intertube distance by swelling the PVA molecular chains via the absorption of water molecules...
January 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28098445/circular-and-chainlike-copper-ii-lanthanide-iii-complexes-generated-by-assembly-reactions-of-racemic-and-chiral-copper-ii-cross-linking-ligand-complexes-with-ln-iii-no3-3%C3%A2-6h2o-ln-iii-gd-iii-tb-iii-dy-iii
#16
Takahiro Ueno, Takeshi Fujinami, Naohide Matsumoto, Masaki Furusawa, Ryo Irie, Nazzareno Re, Takuya Kanetomo, Takayuki Ishida, Yukinari Sunatsuki
The 1:1 assembly reaction of the racemic form of the cross-linking ligand complex Na[Cu(II)L(dpen(1R2R/1S2S))] with Ln(III)(NO3)3·6H2O gave the centrosymmetric circular (Cu(II)Ln(III))2 complex [Cu(II)L(dpen(1R2R/1S2S))Ln(III)(NO3)2]2 (1Ln: Ln = Gd, Tb, Dy), while the reaction of the enantiopure form Na[Cu(II)L(dpen(1R2R))] with Ln(III)(NO3)3·6H2O gave the chiral chainlike (Cu(II)Ln(III))1∞ complex [Cu(II)L(dpen(1R2R))Ln(III)(NO3)2(CH3CN)]1∞·CH3CN (2Ln: Ln = Gd, Tb, Dy), where {Cu(II)L(dpen(1R2R))}(-) is (N-((1R,2R)-2-(((E)-3-ethoxy-2-oxybenzylidene)amino)-1,2-diphenylethyl)-2-oxybenzamide)copper(II) and {Cu(II)L(dpen(1R2R/1S2S))}(-) is the racemic mixture of {Cu(II)L(dpen(1R2R))}(-) and {Cu(II)L(dpen(1S2S))}(-)...
January 18, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28098321/the-shortest-th-th-distance-from-a-new-type-of-quadruple-bond
#17
Han-Shi Hu, Nikolas Kaltsoyannis
Compounds featuring unsupported metal-metal bonds between actinide elements remain highly sought after yet confined experimentally to inert gas matrix studies. Notwithstanding this paucity, actinide-actinide bonding has been the subject of extensive computational research. In this contribution, high level quantum chemical calculations at both the scalar and spin-orbit levels are used to probe the Th-Th bonding in a range of zero valent systems of general formula LThThL. Several of these compounds have very short Th-Th bonds arising from a new type of Th-Th quadruple bond with a previously unreported electronic configuration featuring two unpaired electrons in 6d-based δ bonding orbitals...
January 18, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28098314/isoindoline-nitroxide-labeled-porphyrins-as-potential-fluorescence-suppressed-spin-probes
#18
F Liu, T J Zou, Z L Tan, S Chen, Z H Wu, G P Yan, Q Zhang, S C Liang, J Yang
A series of isoindoline nitroxide-labeled porphyrins were synthesized by the reaction of 5-phenyldipyrromethane and 5-(4'-carboethoxy-methyleneoxyphenyl)dipyrromethane with 5-formyl-1,1,3,3-tetramethylisoindolin-2-yloxyl (FTMIO) using the Lindsey method. The corresponding water-soluble spin-labeled porphyrins were also prepared. Subsequently, these compounds were characterized and their in vitro properties were evaluated. The electrochemical assay demonstrated that these isoindoline nitroxide-labeled porphyrins had similar electrochemical and redox properties to 5-carboxy-1,1,3,3-tetramethylisoindolin-2-yloxyl (CTMIO)...
January 18, 2017: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/28098300/exploration-of-new-ferromagnetic-semiconducting-and-biocompatible-nb3x8-x-cl-br-or-i-monolayers-with-considerable-visible-and-infrared-light-absorption
#19
Junke Jiang, Qiuhua Liang, Ruishen Meng, Qun Yang, Chunjian Tan, Xiang Sun, Xianping Chen
Ferromagnetic character and biocompatible properties have become key factors for developing next-generation spintronic devices and show potential in biomedical applications. Unfortunately, the Mn-containing monolayer is not biocompatible though it has been extensively studied, and the Cr-containing monolayer is not environmental friendly, although these monolayers are ferromagnetic. Herein, we systematically investigated new types of 2D ferromagnetic monolayers Nb3X8 (X = Cl, Br or I) by means of first principles calculations together with mean field approximation based on the classical Heisenberg model...
January 18, 2017: Nanoscale
https://www.readbyqxmd.com/read/28098267/a-tailored-multi-frequency-epr-approach-to-accurately-determine-the-magnetic-resonance-parameters-of-dynamic-nuclear-polarization-agents-application-to-amupol
#20
P Gast, D Mance, E Zurlo, K L Ivanov, M Baldus, M Huber
To understand the dynamic nuclear polarization (DNP) enhancements of biradical polarizing agents, the magnetic resonance parameters need to be known. We describe a tailored EPR approach to accurately determine electron spin-spin coupling parameters using a combination of standard (9 GHz), high (95 GHz) and ultra-high (275 GHz) frequency EPR. Comparing liquid- and frozen-solution continuous-wave EPR spectra provides accurate anisotropic dipolar interaction D and isotropic exchange interaction J parameters of the DNP biradical AMUPol...
January 18, 2017: Physical Chemistry Chemical Physics: PCCP
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