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https://www.readbyqxmd.com/read/28324242/numerical-insights-into-the-phase-diagram-of-p-atic-membranes-with-spherical-topology
#1
A G Hansen, N Ramakrishnan, P B Sunil Kumar, J H Ipsen
The properties of self-avoiding p-atic membranes restricted to spherical topology have been studied by Monte Carlo simulations of a triangulated random surface model. Spherically shaped p-atic membranes undergo a Kosterlitz-Thouless transition as expected with topology induced mutually repelling disclinations of the p-atic ordered phase. For flexible membranes the phase behaviour bears some resemblance to the spherically shaped case with a p-atic disordered crumpled phase and p-atic ordered, conformationally ordered (crinkled) phase separated by a KT-like transition with proliferation of disclinations...
March 2017: European Physical Journal. E, Soft Matter
https://www.readbyqxmd.com/read/28323817/hippocampal-and-prefrontal-processing-of-network-topology-to-simulate-the-future
#2
Amir-Homayoun Javadi, Beatrix Emo, Lorelei R Howard, Fiona E Zisch, Yichao Yu, Rebecca Knight, Joao Pinelo Silva, Hugo J Spiers
Topological networks lie at the heart of our cities and social milieu. However, it remains unclear how and when the brain processes topological structures to guide future behaviour during everyday life. Using fMRI in humans and a simulation of London (UK), here we show that, specifically when new streets are entered during navigation of the city, right posterior hippocampal activity indexes the change in the number of local topological connections available for future travel and right anterior hippocampal activity reflects global properties of the street entered...
March 21, 2017: Nature Communications
https://www.readbyqxmd.com/read/28319835/convergent-and-divergent-effects-of-apolipoprotein-e-%C3%AE%C2%B54-and-%C3%AE%C2%B52-alleles-on-amygdala-functional-networks-in-nondemented-older-adults
#3
Liang Gong, Hao Shu, Cancan He, Qing Ye, Feng Bai, Chunming Xie, Zhijun Zhang
Traditionally, in the context of Alzheimer's disease, the apolipoprotein E ε2 (APOEε2) allele is a protective factor and the APOEε4 allele is a destructive factor. However, this inverse relationship has recently been challenged, and the neural mechanisms underlying the effects of APOE genotype on Alzheimer's disease remain unclear. A resting-state functional magnetic resonance imaging study was conducted to investigate the effects of APOE genotype and age on amygdala functional connectivity (AFC) networks in 84 patients with amnestic mild cognitive impairment and 124 cognitively normal order adults...
February 24, 2017: Neurobiology of Aging
https://www.readbyqxmd.com/read/28319391/synthesis-isotopic-enrichment-and-solid-state-nmr-characterization-of-zeolites-derived-from-the-assembly-disassembly-organisation-reassembly-process
#4
Giulia P M Bignami, Daniel M Dawson, Valerie R Seymour, Paul S Wheatley, Russell Edward Morris, Sharon E Ashbrook
The great utility and importance of zeolites in fields as diverse as industrial catalysis and medicine has driven considerable interest in the ability to target new framework types with novel properties and applications. The recently-introduced and unconventional Assembly, Disassembly, Organization, Reassembly (ADOR) method represents one exciting new approach to obtain solids with targeted structures by selectively disassembling pre-prepared hydrolytically-unstable frameworks, and then reassembling the resulting products to form materials with new topologies...
March 20, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28319388/visualizing-intramolecular-vibrational-redistribution-in-cyclotrimethylene-trinitramine-rdx-crystal-by-multiplex-coherent-anti-stokes-raman-scattering
#5
Guoyang Yu, Yangyang Zeng, Wencan Guo, Honglin Wu, Gangbei Zhu, Zhaoyang Zheng, Xianxu Zheng, Yunfei Song, Yanqiang Yang
The femtosecond time-resolved multiplex coherent anti-Stokes Raman scattering (CARS) technique has been performed to investigate the intramolecular vibrational redistribution (IVR) through vibrational couplings in RDX molecules. In the multiplex CARS experiment, the supercontinuum (SC) was used as broadband Stokes light to coherently and collectively excite multiple vibrational modes, and quantum beats arising from vibrational couplings among these modes were observed. The IVR of RDX is visualized by a topological graph of these vibrational couplings...
March 20, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28318975/a-large-and-consistent-phylogenomic-dataset-supports-sponges-as-the-sister-group-to-all-other-animals
#6
Paul Simion, Hervé Philippe, Denis Baurain, Muriel Jager, Daniel J Richter, Arnaud Di Franco, Béatrice Roure, Nori Satoh, Éric Quéinnec, Alexander Ereskovsky, Pascal Lapébie, Erwan Corre, Frédéric Delsuc, Nicole King, Gert Wörheide, Michaël Manuel
Resolving the early diversification of animal lineages has proven difficult, even using genome-scale datasets. Several phylogenomic studies have supported the classical scenario in which sponges (Porifera) are the sister group to all other animals ("Porifera-sister" hypothesis), consistent with a single origin of the gut, nerve cells, and muscle cells in the stem lineage of eumetazoans (bilaterians + ctenophores + cnidarians). In contrast, several other studies have recovered an alternative topology in which ctenophores are the sister group to all other animals (including sponges)...
March 8, 2017: Current Biology: CB
https://www.readbyqxmd.com/read/28318622/computer-assisted-topological-analysis-of-renal-allograft-inflammation-adds-to-risk-evaluation-at-diagnosis-of-humoral-rejection
#7
Antoine Sicard, Vannary Meas-Yedid, Maud Rabeyrin, Alice Koenig, Stephanie Ducreux, Frederique Dijoud, Valerie Hervieu, Lionel Badet, Emmanuel Morelon, Jean Christophe Olivo-Marin, Valerie Dubois, Olivier Thaunat
Antibody-mediated rejection is associated with heterogeneous kidney allograft outcomes. Accurate evaluation of risk for graft loss at time of diagnosis is necessary to offer personalized treatment. In contrast with serological and molecular assessment, morpho-histological evaluation of antibody-mediated rejection lesions has not significantly evolved. This relies on Banff classifications designed to be of diagnostic discriminatory power rather than prognostic and face quantitative and qualitative limitations...
March 15, 2017: Kidney International
https://www.readbyqxmd.com/read/28318235/unusual-tri-hexa-and-nonanuclear-cu-ii-cage-methylsilsesquioxanes-synthesis-structures-and-catalytic-activity-in-oxidations-with-peroxides
#8
Alexey N Bilyachenko, Alena N Kulakova, Mikhail M Levitsky, Artem A Petrov, Alexander A Korlyukov, Lidia S Shul'pina, Victor N Khrustalev, Pavel V Dorovatovskii, Anna V Vologzhanina, Ulyana S Tsareva, Igor E Golub, Ekaterina S Gulyaeva, Elena S Shubina, Georgiy B Shul'pin
Three types of unusual cagelike copper(II) methylsilsesquioxanes, namely, nona- [(MeSiO1.5)18(CuO)9] 1, hexa- [(MeSiO1.5)10(HO0.5)2(CuO)6(C12H8N2)2(MeSiO1.5)10(HO0.5)1.33(CH3COO0.5)0.67(CuO)6(C12H8N2)2] 2, [(MeSiO1.5)10(CuO)6(MeO0.5)2(C10H8N2)2] 3, and trinuclear [(MeSiO1.5)8(CuO)3(C10H8N2)2] 4, were obtained in 44%, 27%, 20%, and 16% yields, respectively. Nuclearity and structural fashion of products was controlled by the choice of solvent system and ligand, specifically assisting the assembling of cage. Structures of 1-4 were determined by single-crystal X-ray diffraction analysis...
March 20, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28318226/ultrathin-bi1-xsbx-2se3-field-effect-transistor-with-large-on-off-ratio
#9
Yu-Hung Liu, Cheong-Wei Chong, Chun-Ming FanChiang, Jung-Chun-Andrew Huang, Hsieh-Cheng Han, Zhongjun Li, Huaili Qiu, Yi-Chang Li, Chuan-Pu Liu
Ultrathin three-dimensional topological insulator films are promising for use in field effect devices. (Bi1-xSbx)2Se3 ultrathin films were fabricated on SrTiO3 substrate, where large resistance changes of ∼25000% could be achieved using the back gate voltage. We suggest that the large ON/OFF ratio was caused by the combined effect of Sb-doping and the reduction of film thickness down to the ultrathin regime. The crossover of different quantum transport under an electric field may form the basis for TI-based spin transistors with large ON/OFF ratios in the future...
March 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28318063/concept-of-quantum-geometry-in-optoelectronic-processes-in-solids-application-to-solar-cells
#10
REVIEW
Naoto Nagaosa, Takahiro Morimoto
The concept of topology is becoming more and more relevant to the properties and functions of electronic materials including various transport phenomena and optical responses. A pedagogical introduction is given here to the basic ideas and their applications to optoelectronic processes in solids.
March 20, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28317991/a-novel-naphthalenediimide-based-lanthanide-organic-framework-with-polyoxometalate-templates-exhibiting-reversible-photochromism
#11
Hai-Long Zhang, Jian-Zhen Liao, Wenbin Yang, Xiao-Yuan Wu, Can-Zhong Lu
The first visible-light-responsive photochromic polyoxometalate-templated lanthanide-organic framework (LOF) has been constructed from a carboxyphenyl-substituted naphthalenediimide (NDI) derivative, which displays an unusual four-fold interpenetration of an srs topological network, featuring a variety of anion-π interactions between polyoxoanions and π-acidic NDI moieties, and undergoes a rapid reversible photochromic transformation upon blue light irradiation.
March 20, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28317987/when-self-assembly-meets-topology-an-enhanced-micelle-stability
#12
Xiaopeng Dong, Xuliang Guo, Guangqin Liu, Aiping Fan, Zheng Wang, Yanjun Zhao
The topology of hydrophobic moieties can affect the stability of self-assembled micelles. Curved corannulene and flat perylene were selected as model hydrophobic molecules with poly(ethylene glycol) as the hydrophilic segment. The curvature can enhance the intermolecular π-π interaction, and hence the driving force of micelle formation.
March 20, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28317959/packing-energetics-determine-the-folding-routes-of-the-rnase-h-proteins
#13
Shilpa Yadahalli, Shachi Gosavi
Comparative studies of proteins from a family have been used to understand the factors that determine the folding routes of proteins. It has been conjectured that the folding mechanism of ribonuclease-H (RNase-H) proteins is determined by the topology of their fold. To test this hypothesis, we computationally studied the folding of four proteins from the RNase-H family, which have the overall RNase-H fold, but whose topologies differ in the region termed CORE in E. coli RNase-H. We simulated the folding of these proteins using molecular dynamics (MD) simulations of a coarse-grained structure-based model (SBM) which captures the effects of topology and found that the four proteins had similar folding routes...
March 20, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28317894/swim-a-computational-tool-to-unveiling-crucial-nodes-in-complex-biological-networks
#14
Paola Paci, Teresa Colombo, Giulia Fiscon, Aymone Gurtner, Giulio Pavesi, Lorenzo Farina
SWItchMiner (SWIM) is a wizard-like software implementation of a procedure, previously described, able to extract information contained in complex networks. Specifically, SWIM allows unearthing the existence of a new class of hubs, called "fight-club hubs", characterized by a marked negative correlation with their first nearest neighbors. Among them, a special subset of genes, called "switch genes", appears to be characterized by an unusual pattern of intra- and inter-module connections that confers them a crucial topological role, interestingly mirrored by the evidence of their clinic-biological relevance...
March 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28317835/reducing-cascading-failure-risk-by-increasing-infrastructure-network-interdependence
#15
Mert Korkali, Jason G Veneman, Brian F Tivnan, James P Bagrow, Paul D H Hines
Increased interconnection between critical infrastructure networks, such as electric power and communications systems, has important implications for infrastructure reliability and security. Others have shown that increased coupling between networks that are vulnerable to internetwork cascading failures can increase vulnerability. However, the mechanisms of cascading in these models differ from those in real systems and such models disregard new functions enabled by coupling, such as intelligent control during a cascade...
March 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28317377/3d-printed-ultratough-hydrogel-structures-with-titin-like-domains
#16
Fengbo Zhu, Libo Cheng, Zhi Jian Wang, Wei Hong, Zi Liang Wu, Jun Yin, Jin Qian, Qiang Zheng
Titin is composed of repeated modular domains which unfold and dissipate energy upon loading. Here we employed such molecular-level paradigm to fabricate macroscopic ultratough hydrogel structures with titin-like domains, enabled by three-dimensional printing with multiple nozzles. Under stretch, the relatively thin and weak gel fibers in the printed structures break first and the hidden lengths postpone the failure of the main structures, mimicking the toughening principle in titin. These titin-like folded domains have been incorporated into a synthetic spider-web, which shows significantly enhanced extensibility and toughness...
March 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28316244/electronic-properties-of-bimetallic-metal-organic-frameworks-mofs-tailoring-density-of-electronic-states-through-mof-modularity
#17
Ekaterina A Dolgopolova, Amy J Brandt, Otega Ejegbavwo, Audrey S Duke, Thathsara D Maddumapatabandi, Randima P Galhenage, Bryon W Larson, Obadiah Reid, Salai Cheettu Ammal, Andreas Heyden, Mvs Chandrashekhar, Vitalie Stavila, Donna A Chen, Natalia B Shustova
Development of porous well-defined hybrid materials (e.g., metal-organic frameworks (MOFs)) will add a new dimension to a wide number of applications ranging from supercapacitors and electrodes to "smart" membranes and thermoelectrics. From this perspective, understanding and tailoring electronic properties of MOFs is a key fundamental challenge that could unlock the full potential of these materials. In this work, we focused on the fundamental insights responsible for the electronic properties of three distinct classes of bimetallic systems, Mx-yM'y-MOFs, MxM'y-MOFs, and Mx(ligand-M'y)-MOFs, in which the second metal (M') incorporation occurs through: (i) metal (M) replacement in the framework nodes (type I), (ii) metal node extension (type II), and (iii) metal coordination to the organic ligand (type III), respectively...
March 18, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28316238/exfoliation-of-covalent-organic-frameworks-into-few-layer-redox-active-nanosheets-as-cathode-materials-for-lithium-ion-batteries
#18
Shan Wang, Qianyou Wang, Pengpeng Shao, Yuzhen Han, Xing Gao, Li Ma, Shuai Yuan, Xiaojie Ma, Junwen Zhou, Xiao Feng, Bo Wang
Covalent organic frameworks (COFs) have attracted growing interest by virtue of their structural diversity and tunability. Herein, we present a novel approach for the development of organic rechargeable battery cathodes in which three distinct redox-active COFs were successfully prepared and delaminated into 2D few-layer nanosheets. Compared with the pristine COFs, the exfoliated COFs with shorter Li(+) diffusion pathways allow a significant higher utilization efficiency of redox sites and faster kinetics for lithium storage...
March 21, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28315770/biophysics-and-protein-corona-analysis-of-janus-cyclodextrin-dna-nanocomplexes-efficient-cellular-transfection-on-cancer-cells
#19
M Martínez-Negro, G Caracciolo, S Palchetti, D Pozzi, A L Capriotti, C Cavaliere, A Laganà, C Ortiz Mellet, J M Benito, J M García Fernández, E Aicart, E Junquera
The self-assembling processes underlining the capabilities of facially differentiated ("Janus") polycationic amphiphilic cyclodextrins (paCDs) as non-viral gene nanocarriers have been investigated by a pluridisciplinary approach. Three representative Janus paCDs bearing a common tetradecahexanoyl multitail domain at the secondary face and differing in the topology of the cluster of amino groups at the primary side were selected for this study. All of them compact pEGFP-C3 plasmid DNA and promote transfection in HeLa and MCF-7 cells, both in absence and in presence of human serum...
March 15, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28315703/molecular-endocrinology-of-vitamin-d-on-the-epigenome-level
#20
REVIEW
Carsten Carlberg
The molecular endocrinology of vitamin D is based on the facts that i) its metabolite 1α,25-dihydroxyvitamin D3 (1,25(OH)2D3) is the high affinity ligand of the nuclear receptor vitamin D receptor (VDR) and ii) the transcription factor VDR is the unique target of 1,25(OH)2D3 in the nucleus. Short-term alterations of the epigenome are primarily changes in the post-translational modification status of nucleosome-forming histone proteins, the consequences of which are i) a local increase or decrease in chromatin accessibility and ii) the activation or repression of gene transcription...
March 15, 2017: Molecular and Cellular Endocrinology
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