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https://www.readbyqxmd.com/read/29786921/room-temperature-ferroelectricity-in-an-organic-cocrystal
#1
Adam J Matzger, Ren A Wiscons, Nagula Rajesh Goud, Joshua T Damron
Ferroelectric materials exhibit switchable remanent polarization due to reversible symmetry breaking under an applied electric field. Previous research has leveraged temperature-induced neutral-ionic transitions in charge-transfer (CT) cocrystals to access ferroelectrics that operate through displacement of molecules under an applied field. However, displacive ferroelectric behavior is rare in organic CT cocrystals and achieving a Curie temperature (TC) above ambient has been elusive. Here a cocrystal between acenaphthene and 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane is presented that shows switchable remanent polarization at room temperature (TC = 68°C)...
May 22, 2018: Angewandte Chemie
https://www.readbyqxmd.com/read/29786835/bilateral-asymmetry-of-the-humerus-in-neandertals-australian-aborigines-and-medieval-humans
#2
Anna Maria Kubicka, Wioletta Nowaczewska, Antoine Balzeau, Janusz Piontek
OBJECTIVES: Bilateral asymmetry of diaphyseal shape and size may be a reflection of relative activity levels and patterns of habitual biomechanical stress in the upper arms of Neandertals and Homo sapiens. The main purpose of our study was to assess the level of directional asymmetry of humeral cross sections in Neandertals, recent Australian aborigines, and medieval farmers. MATERIALS AND METHODS: Indices of directional and absolute asymmetry (%DA and %AA) of humeral cross-sectional properties in Neandertals and recent Homo sapiens were calculated...
May 22, 2018: American Journal of Physical Anthropology
https://www.readbyqxmd.com/read/29786787/protocols-for-migration-and-invasion-studies-in-prostate-cancer
#3
Arjanneke F van de Merbel, Geertje van der Horst, Jeroen T Buijs, Gabri van der Pluijm
Prostate cancer is the most common malignancy diagnosed in men in the western world. The development of distant metastases and therapy resistance are major clinical problems in the management of prostate cancer patients. In order for prostate cancer to metastasize to distant sites in the human body, prostate cancer cells have to migrate and invade neighboring tissue. Cancer cells can acquire a migratory and invasive phenotype in several ways, including single cell and collective migration. As a requisite for migration, epithelial prostate cancer cells often need to acquire a motile, mesenchymal-like phenotype...
2018: Methods in Molecular Biology
https://www.readbyqxmd.com/read/29786730/dimensional-control-of-supramolecular-assemblies-of-diacetylene-derived-peptide-gemini-amphiphile-from-spherical-micelles-to-foamlike-networks
#4
Hao Jiang, Martin Ehlers, Xiao-Yu Hu, Elio Zellermann, Carsten Schmuck
Peptide amphiphiles capable of assembling into multidimensional nanostructures have attracted much attention over the past decade due to their potential applications in materials science. Herein, a novel diacetylene-derived peptide gemini amphiphile with a fluorenylmethyloxycarbonyl (Fmoc) group at the N-terminus is reported to hierarchically assemble into spherical micelles, one-dimensional nanorods, two-dimensional foamlike networks and lamellae. Solvent polarity shows a remarkable effect on the self-assembled structures by changing the balance of four weak noncovalent interactions (hydrogen-bonding, π-π stacking, hydrophobic interaction, and electrostatic repulsion)...
May 22, 2018: Soft Matter
https://www.readbyqxmd.com/read/29786620/the-effect-of-bottom-electrode-on-ferroelectric-tunnel-junctions-based-on-cmos-compatible-hfo2
#5
Youngin Goh, Sanghun Jeon
Ferroelectric tunnel junctions (FTJs) have attracted research interest as promising candidates for non-destructive readout non-volatile memories. Unlike conventional perovskite FTJs, hafnia FTJ offers many advantages in terms of scalability and CMOS compatibility. However, so far, hafnia FTJ has shown poor endurance and relatively low resistance ratio and these have remained the issue for real device applications. In our study, we fabricated HfZrO-based FTJ with various electrodes (TiN, Si, SiGe, Ge) and improved the memory performance of HfZrO-based FTJ by using the asymmetry of the charge screening lengths of the electrodes...
May 22, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29786610/thermoelectric-transport-properties-of-ti-doped-adsorbed-monolayer-blue-phosphorene
#6
Lin Zhu, Bowen Li, Kailun Yao
Thermoelectric transport properties of Ti doped or adsorbed monolayer blue phosphorene are investigated by density functional theory calculations combined with the nonequilibrium Green's function formalism. The thermal giant magnetoresistance and a nearly 100% spin polarization which solely relies on the temperature gradient of electrodes without bias or gate voltage are observed. Moreover, the spin Seebeck effect is also found. Furthermore, taking into account the electronic and phonon dispersion, the thermoelectric merit for Ti doping in the monolayer blue phosphorene at room temperature is also studied, the maximum value of thermoelectric merit can reach 1...
May 22, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29786497/massilia-armeniaca-sp-nov-isolated-from-desert-soil
#7
Mengnan Ren, Xiaoyan Li, Yueqi Zhang, Yu Jin, Siqi Li, Haidong Huang
A Gram-stain-negative, aerobic, motile and rod-shaped bacterium, strain ZMN-3T , was isolated from desert soil sample collected from Ongniod Qi, Inner Mongolia, China. Phylogenetic analysis based on 16S rRNA gene sequences showed that strain ZMN-3T was affiliated with the genus Massilia and showed the highest similarity to Massilia humi THG S6-8T (98.9 %) and Massilia buxea A9T (98.2 %). In partial gyrB and lepA sequences, the highest similarity of strain ZMN-3T and M. humi THG S6-8T were 95.9 and 96.8 %, respectively...
May 22, 2018: International Journal of Systematic and Evolutionary Microbiology
https://www.readbyqxmd.com/read/29786445/iron-catalyzed-dehydrative-alkylation-of-propargyl-alcohol-with-alkyl-peroxides-to-form-substituted-1-3-enynes
#8
Changqing Ye, Bo Qian, Yajun Li, Min Su, Daliang Li, Hongli Bao
This paper reports a new method for the generation of substituted 1,3-enynes, whose synthesis by other methods could be a challenge. The dehydrative decarboxylative cascade coupling reaction of propargyl alcohol with alkyl peroxides is enabled by an iron catalyst and alkylating reagents. Primary, secondary, and tertiary alkyl groups can be introduced into 1,3-enynes, affording various substituted 1,3-enynes in moderate to good yields. Mechanistic studies suggest the involvement of a radical-polar crossover pathway...
May 22, 2018: Organic Letters
https://www.readbyqxmd.com/read/29786434/ion-imaging-of-mgi-photofragment-in-ultraviolet-photodissociation-of-mass-selected-mg-ich-3-complex
#9
Kenichi Okutsu, Kenichiro Yamazaki, Motoyoshi Nakano, Keijiro Ohshimo, Fuminori Misaizu
We have observed images of MgI+ fragment ions produced in ultraviolet laser photodissociation of mass-selected Mg+ ICH3 ions at 266 nm. Split distribution almost perpendicular to the polarization direction of the photolysis laser was observed in the photofragment image. Potential energy curves of Mg+ ICH3 were obtained by theoretical calculations. Among these curves, the excited complex ion dissociated along almost repulsive potentials with several avoided crossings which was connected to MgI+ + CH3 . In the ground state of Mg+ ICH3 , the CH3 I was bonded with Mg from the iodine side, and the Mg-I-C bond angle was calculated to be 101...
May 22, 2018: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/29786112/ctla%C3%A2-4-interferes-with-the-hbv%C3%A2-specific-t-cell-immune-response-review
#10
Hui Cao, Ruiwen Zhang, Wei Zhang
Hepatitis B virus (HBV) infection is a major cause of hepatic inflammation. Successful HBV clearance in patients is associated with sustained viral control by effector T cells. Compared with acute hepatitis B, chronic HBV infection is associated with the depletion of T cells, resulting in weak or absent virus‑specific T cells reactivity, which is described as 'exhaustion'. This exhaustion is characterized by impaired cytokine production and sustained expression of multiple coinhibitory molecules. Cytotoxic T lymphocyte‑associated antigen‑4 (CTLA‑4) is one of many coinhibitory molecules that can attenuate T cell activation by inhibiting costimulation and transmitting inhibitory signals to T cells...
May 17, 2018: International Journal of Molecular Medicine
https://www.readbyqxmd.com/read/29785623/synthesis-spectroscopic-characterization-and-polymerization-abilities-of-blue-and-green-light-emitting-oxazol-5-one-fluorophores
#11
Gulsiye Ozturk Urut, Seher Aydin, Derya Topkaya, Elif Sahin, Serap Alp
New fluorescent thiophenyl group containing oxazol-5-one fluorophores of 3a (4-(3-thiophenylmethylene)-2-phenyloxazol-5-one), 3b (4-(3-thiophenylmethylene)-2-(4-tolyl)oxazol-5-one) and 3c (4-(3-thiophenylmethylene)-2-(4-nitrophenyl)oxazol-5-one) were synthesized and characterized. The newly synthesized oxazol-5-ones absorption and fluorescence characteristics were studied in some solvents of varying polarities. The heterocyclic chromophores were fluorescent, with two of them, 3a and 3b, emitting blue light, whilst the other one, 3c, emitting green light...
May 21, 2018: Journal of Fluorescence
https://www.readbyqxmd.com/read/29785482/characterization-and-antimicrobial-property-of-some-heavy-metals-containing-ayurvedic-drugs
#12
Prasamsha Panta, Tika Ram Bhandari, Bidit Lamsal, Rameshwar Adhikari
Ayurvedic medicines are often used in different formulations, the heavy metals, which are generally referred to as being toxic. In this work, we report on the physicochemical characterization and biological activity of some typical Ayurvedic drugs available in the market that contain arsenic, mercury and lead with the emphasis on their antibacterial performance. Among the formulations studied, some of the drugs with 'amorphous' texture (and higher solubility) were found quite active against some bacterial strains whereas the formulations possessing crystalline texture (and low solubility) were found practically ineffective...
2018: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/29785443/organic-inorganic-hybrid-perovskite-quantum-dots-with-high-plqy-and-enhanced-carrier-mobility-through-crystallinity-control-by-solvent-engineering-and-solid-state-ligand-exchange
#13
Jin Woo Choi, Hee Chul Woo, Xiaoguang Huang, Wan-Gil Jung, Bong-Joong Kim, Sie-Wook Jeon, Sang-Youp Yim, Jae-Suk Lee, Chang-Lyoul Lee
The photoluminescence quantum yield (PLQY) and charge carrier mobility of organic-inorganic perovskite QDs were enhanced by the optimization of crystallinity and surface passivation as well as solid-state ligand exchange. The crystallinity of perovskite QDs was determined by the Effective solvent field (Esol) of various solvents for precipitation. The solvent with high Esol could more quickly countervail the localized field generated by the polar solvent, and it causes fast crystallization of the dissolved precursor, which results in poor crystallinity...
May 22, 2018: Nanoscale
https://www.readbyqxmd.com/read/29785442/photoinduced-intramolecular-charge-transfer-in-a-cross-conjugated-push-pull-enediyne-implications-toward-photoreaction
#14
Anuja Singh, Avik Kumar Pati, Ashok Kumar Mishra
Push-pull organic fluorophores are important owing to their interesting optoelectronical properties. Here we report the photophysics of a new cross-conjugated push-pull enediynyl dye which belongs to an unexplored class of π-conjugated donor-acceptor systems. Two N,N-dimethylaniline moieties serve as donors and one pyrene ring functions as an acceptor via a common Y-shaped 'enediyne' bridge which facilitates the cross-electronic communication. The dye exhibits dual emission from locally excited (LE) and intramolecular charge transfer (ICT) states...
May 22, 2018: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29785441/processing-of-pvdf-based-electroactive-ferroelectric-films-importance-of-pmma-and-cooling-rate-from-the-melt-state-on-the-crystallization-of-pvdf-beta-crystals
#15
Alexandre De Neef, Cédric Samuel, Grégory Stoclet, Mohamed Rguiti, Christian Courtois, Philippe Dubois, Jérémie Soulestin, Jean-Marie Raquez
Poly(vinylidene difluoride) (PVDF) displays attractive ferroelectric/piezoelectric properties and its polar β-crystals are specifically targeted for achieving electroactive applications. However, their direct crystallization from the melt state represents a challenging task that has never been addressed using melt-state processes. The use of poly(methyl methacrylate) (PMMA) is herein investigated to promote the PVDF polar β-phase using melt-blending and extrusion-calendering technologies. The presence of the β-phase is here confirmed by ATR-FTIR and WAXS experiments with blends at a PMMA content as low as 5 wt%...
May 22, 2018: Soft Matter
https://www.readbyqxmd.com/read/29785304/application-of-25-mhz-b-scan-ultrasonography-to-determine-the-integrity-of-the-posterior-capsule-in-posterior-polar-cataract
#16
Yawen Guo, Chengzhe Lu, Bin Wu, Jianmin Gao, Jun Li, Xiaoyong Yuan, Xin Tang
Purpose: To report the application of 25 MHz B-scan ultrasonography (MHzB) to determine the integrity of the posterior capsule (PC) in posterior polar cataract (PPC). Methods: Patients with whom PPC was clinically diagnosed using slit lamp microscopy who underwent 25 MHzB before phacoemulsification were retrospectively reviewed. The status of the PC was determined by 25 MHzB before phacoemulsification and confirmed during cataract surgery. Results: In total, 21 eyes in 14 clinically diagnosed PPC patients were enrolled in this study...
2018: Journal of Ophthalmology
https://www.readbyqxmd.com/read/29785057/computational-redesign-of-enzymes-for-regio-and-enantioselective-hydroamination
#17
Ruifeng Li, Hein J Wijma, Lu Song, Yinglu Cui, Marleen Otzen, Yu'e Tian, Jiawei Du, Tao Li, Dingding Niu, Yanchun Chen, Jing Feng, Jian Han, Hao Chen, Yong Tao, Dick B Janssen, Bian Wu
Introduction of innovative biocatalytic processes offers great promise for applications in green chemistry. However, owing to limited catalytic performance, the enzymes harvested from nature's biodiversity often need to be improved for their desired functions by time-consuming iterative rounds of laboratory evolution. Here we describe the use of structure-based computational enzyme design to convert Bacillus sp. YM55-1 aspartase, an enzyme with a very narrow substrate scope, to a set of complementary hydroamination biocatalysts...
May 21, 2018: Nature Chemical Biology
https://www.readbyqxmd.com/read/29785033/identification-and-characterization-of-diverse-coherences-in-the-fenna-matthews-olson-complex
#18
Erling Thyrhaug, Roel Tempelaar, Marcelo J P Alcocer, Karel Žídek, David Bína, Jasper Knoester, Thomas L C Jansen, Donatas Zigmantas
The idea that excitonic (electronic) coherences are of fundamental importance to natural photosynthesis gained popularity when slowly dephasing quantum beats (QBs) were observed in the two-dimensional electronic spectra of the Fenna-Matthews-Olson (FMO) complex at 77 K. These were assigned to superpositions of excitonic states, a controversial interpretation, as the strong chromophore-environment interactions in the complex suggest fast dephasing. Although it has been pointed out that vibrational motion produces similar spectral signatures, a concrete assignment of these oscillatory signals to distinct physical processes is still lacking...
May 21, 2018: Nature Chemistry
https://www.readbyqxmd.com/read/29785016/solid-papillary-carcinoma-with-reverse-polarity-of-the-breast-harbors-specific-morphologic-immunohistochemical-and-molecular-profile-in-comparison-with-other-benign-or-malignant-papillary-lesions-of-the-breast-a-comparative-study-of-9-additional-cases
#19
Nadjla Alsadoun, Gaëtan MacGrogan, Caroline Truntzer, Magali Lacroix-Triki, Isabelle Bedgedjian, Marie-Hélène Koeb, Elsy El Alam, Dan Medioni, Michel Parent, Pascal Wuithier, Isabelle Robert, Romain Boidot, Laurent Arnould
Solid papillary carcinoma with reverse polarity is a rare breast cancer of favorable prognosis that can be difficult to diagnose. We report here nine additional cases of this tumor, and we describe its morphologic, immunohistochemical and molecular profile in comparison to other types of papillary and micropapillary lesions of the breast that are intraductal papilloma with usual ductal hyperplasia, encapsulated papillary carcinoma, solid papillary carcinoma and invasive micropapillary carcinoma. We studied nine cases of this special papillary tumor and six of each other types mentioned above...
May 21, 2018: Modern Pathology: An Official Journal of the United States and Canadian Academy of Pathology, Inc
https://www.readbyqxmd.com/read/29785008/massively-parallel-coincidence-counting-of-high-dimensional-entangled-states
#20
Matthew Reichert, Hugo Defienne, Jason W Fleischer
Entangled states of light are essential for quantum technologies and fundamental tests of physics. Current systems rely on entanglement in 2D degrees of freedom, e.g., polarization states. Increasing the dimensionality provides exponential speed-up of quantum computation, enhances the channel capacity and security of quantum communication protocols, and enables quantum imaging; unfortunately, characterizing high-dimensional entanglement of even bipartite quantum states remains prohibitively time-consuming. Here, we develop and experimentally demonstrate a new theory of camera detection that leverages the massive parallelization inherent in an array of pixels...
May 21, 2018: Scientific Reports
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