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https://www.readbyqxmd.com/read/28339275/ultrafast-photoinduced-electric-polarization-switching-in-a-hydrogen-bonded-ferroelectric-crystal
#1
K Iwano, Y Shimoi, T Miyamoto, D Hata, M Sotome, N Kida, S Horiuchi, H Okamoto
Croconic acid crystals show proton displacive-type ferroelectricity with a large spontaneous polarization reaching 20  μC/cm^{2}, which originates from the strong coupling of proton and π-electron degrees of freedom. Such a coupling makes us expect a large polarization change by photoirradiations. Optical-pump second-harmonic-generation-probe experiments reveal that a photoexcited croconic-acid crystal loses the ferroelectricity substantially with a maximum quantum efficiency of more than 30 molecules per one absorbed photon...
March 10, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28338413/human-tissue-engineered-skeletal-muscle-myobundles-to-measure-oxygen-uptake-and-assess-mitochondrial-toxicity
#2
Brittany N J Davis, Jeffrey W Santoso, Michaela J Walker, Cindy S Cheng, Timothy R Koves, William E Kraus, George A Truskey
Mitochondrial dysfunction is responsible for the toxicity of a number of drugs. Current isolated mitochondria or cellular monoculture mitochondrial respiration measurement systems lack physiological relevance. Using a tissue engineering rather than cell- or mitochondria-based approach enables a more physiologically relevant detection of drug-induced mitochondrial impairment. To probe oxygen consumption and mitochondrial health, we assayed the bioenergetic profile of engineered three-dimensional human skeletal muscle myobundles derived from primary myoblasts...
March 24, 2017: Tissue Engineering. Part C, Methods
https://www.readbyqxmd.com/read/28333622/constrained-inversion-and-spectral-unmixing-in-multispectral-optoacoustic-tomography
#3
Lu Ding, Xose Luis Dean Ben, Neal C Burton, Robert W Sobol, Vasilis Ntziachristos, Daniel Razansky
Accurate extraction of physical and biochemical parameters from optoacoustic images is often impeded due to the use of unrigorous inversion schemes, incomplete tomographic detection coverage or other experimental factors that cannot be readily accounted for during the image acquisition and reconstruction process. For instance, inaccurate assumptions in the physical forward model may lead to negative optical absorption values in the reconstructed images. Any artifacts present in the single wavelength optoacoustic images can be significantly aggravated when performing a two-step reconstruction consisting in acoustic inversion and spectral unmixing aimed at rendering the distributions of spectrally-distinct absorbers...
March 22, 2017: IEEE Transactions on Medical Imaging
https://www.readbyqxmd.com/read/28324502/telomeres-and-nextgen-co-fish-directional-genomic-hybridization-telo-dgh%C3%A2
#4
Miles J McKenna, Erin Robinson, Edwin H Goodwin, Michael N Cornforth, Susan M Bailey
The cytogenomics-based methodology of Directional Genomic Hybridization (dGH™) emerged from the concept of strand-specific hybridization, first made possible by Chromosome Orientation FISH (CO-FISH), the utility of which was demonstrated in a variety of early applications, often involving telomeres. Similar to standard whole chromosome painting (FISH), dGH™ is capable of identifying inter-chromosomal rearrangements (translocations between chromosomes), but its distinctive strength stems from its ability to detect intra-chromosomal rearrangements (inversions within chromosomes), and to do so at higher resolution than previously possible...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28323634/effect-of-laser-pulse-propagation-on-ultrafast-magnetization-dynamics-in-a-birefringent-medium
#5
J A de Jong, A M Kalashnikova, R V Pisarev, A M Balbashov, A V Kimel, A Kirilyuk, Th Rasing
Light propagation effects can strongly influence the excitation and the detection of laser-induced magnetization dynamics. We investigated experimentally and analytically the effects of crystallographic linear birefringence on the excitation and detection of ultrafast magnetization dynamics in the rare-earth orthoferrites (Sm0.5Pr0.5)FeO3 and (Sm0.55Tb0.45)FeO3, which possess weak and strong linear birefringence, respectively. Our finding is that the effect of linear birefringence on the result of a magneto-optical pump-probe experiment strongly depends on the mechanism of excitation...
April 26, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28301804/reconstructing-diffusion-ordered-nmr-spectroscopy-by-simultaneous-inversion-of-laplace-transform
#6
Bin Yuan, Yiming Ding, Ghulam M Kamal, Limin Shao, Zhiming Zhou, Bin Jiang, Peng Sun, Xu Zhang, Maili Liu
2D diffusion-ordered NMR spectroscopy (DOSY) has been widely recognized as a powerful tool for analyzing mixtures and probing inter-molecular interactions in situ. But it is difficult to differentiate molecules with similar diffusion coefficients in presence of overlapped spectra. Its performance is susceptible to the number of chemical components, and usually gets worse when the number of components increases. Here, to alleviate the problem, numerical simultaneous inversion of Laplace transform (SILT) of many related variables is proposed for reconstructing DOSY spectrum (SILT-DOSY)...
March 7, 2017: Journal of Magnetic Resonance
https://www.readbyqxmd.com/read/28296677/rbm10-tfe3-renal-cell-carcinoma-a-potential-diagnostic-pitfall-due-to-cryptic-intrachromosomal-xp11-2-inversion-resulting-in-false-negative-tfe3-fish
#7
Pedram Argani, Lei Zhang, Victor E Reuter, Satish K Tickoo, Cristina R Antonescu
Xp11 translocation renal cell carcinoma (RCC) are defined by chromosome translocations involving the Xp11 breakpoint which results in one of a variety of TFE3 gene fusions. TFE3 break-apart florescence in situ hybridization (FISH) assays are generally preferred to TFE3 immunohistochemistry (IHC) as a means of confirming the diagnosis in archival material, as FISH is less sensitive to the variable fixation which can result in false positive or false negative IHC. Prompted by a case report in the cytogenetics literature, we identify 3 cases of Xp11 translocation RCC characterized by a subtle chromosomal inversion involving the short arm of the X chromosome, resulting in an RBM10-TFE3 gene fusion...
March 14, 2017: American Journal of Surgical Pathology
https://www.readbyqxmd.com/read/28293948/parashift-probes-solution-nmr-and-x-ray-structural-studies-of-macrocyclic-ytterbium-and-yttrium-complexes
#8
Kevin Mason, Nicola J Rogers, Elizaveta A Suturina, Ilya Kuprov, Juan A Aguilar, Andrei S Batsanov, Dmitry S Yufit, David Parker
Ytterbium and yttrium complexes of octadentate ligands based on 1,4,7,10-tetraazacyclododecane with a coordinated pyridyl group and either tricarboxylate (L(1)) or triphosphinate (L(2)) donors form twisted-square-antiprismatic structures. The former crystallizes in the centrosymmetric group P21/c, with the two molecules related by an inversion center, whereas the latter was found as an unusual kryptoracemate in the chiral space group P21. Pure shift NMR and EXSY spectroscopy allowed the dynamic exchange between the (RRR)-Δ-(δδδδ) and (RRR)-Λ-(λλλλ) TSAP diastereomers of the [Y...
March 15, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28293894/primer-aided-truncation-for-the-creation-of-hybrid-proteins
#9
Robert Stabel, Birthe Stüven, Robert Ohlendorf, Andreas Möglich
Proteins frequently display modular architecture with several domains and segments connected by linkers. Proper protein functionality hinges on finely orchestrated interactions among these constituent elements. The underlying modularity lends itself to the engineering of hybrid proteins via modular rewiring; novel properties can thus be obtained, provided the linkers connecting the individual elements are conducive to productive interactions. As a corollary, the process of protein engineering often encompasses the generation and screening of multiple linker variants...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28285034/social-influence-and-mental-routes-to-the-production-of-authentic-false-memories-and-inauthentic-false-memories
#10
Michael F Wagner, John J Skowronski
Two studies assessed the extent to which people incorporated false facts provided by bogus others into their own recognition memory reports, and how these false memory reports were affected by: (a) truth of the information in others' summaries supporting the false facts, (b) motivation to process stories and summaries, (c) source credibility, and (d) ease of remembering original facts. False memory report frequency increased when false facts in a summary were supported by true information and varied inversely with the ease with which original facts could be remembered...
March 9, 2017: Consciousness and Cognition
https://www.readbyqxmd.com/read/28282191/selective-probing-of-hidden-spin-polarized-states-in-inversion-symmetric-bulk-mos_-2
#11
E Razzoli, T Jaouen, M-L Mottas, B Hildebrand, G Monney, A Pisoni, S Muff, M Fanciulli, N C Plumb, V A Rogalev, V N Strocov, J Mesot, M Shi, J H Dil, H Beck, P Aebi
Spin- and angle-resolved photoemission spectroscopy is used to reveal that a large spin polarization is observable in the bulk centrosymmetric transition metal dichalcogenide MoS_{2}. It is found that the measured spin polarization can be reversed by changing the handedness of incident circularly polarized light. Calculations based on a three-step model of photoemission show that the valley and layer-locked spin-polarized electronic states can be selectively addressed by circularly polarized light, therefore providing a novel route to probe these hidden spin-polarized states in inversion-symmetric systems as predicted by Zhang et al...
February 24, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28275793/-periodontal-status-of-labially-inversely-impacted-maxillary-central-incisor-in-mixed-dentition-after-orthodontic-treatment
#12
Hui-Xi Jiang, Zhen-Sheng Cao, Hao Sun, Han Hu, Yu Fang, Rong-Dang Hu
PURPOSE: To study the periodontal status of labially inversely impacted maxillary central incisor in mixed dentition after orthodontic treatment. METHODS: Sixteen patients with labially inversely impacted maxillary central incisor in mixed dentition and treated by guided rod appliance and conventional fixed appliance were enrolled in this study. Periodontal examinations were performed and cone-beam CT (CBCT) was taken approximately 2 years post treatment. Central incisors were divided into impacted and contralateral incisor groups...
December 2016: Shanghai Kou Qiang Yi Xue, Shanghai Journal of Stomatology
https://www.readbyqxmd.com/read/28272320/the-novel-design-of-a-single-sided-mri-probe-for-assessing-burn-depth
#13
Zhonghua He, Wei He, Jiamin Wu, Zheng Xu
Burn depth assessment in clinics is still inaccurate because of the lack of feasible and practical testing devices and methods. Therefore, this process often depends on subjective judgment of burn surgeons. In this study, a new unilateral magnetic resonance imaging (UMRI) sensor equipped with a 2D gradient coil system was established, and we attempted to assess burns using unilateral nuclear magnetic resonance devices. A reduced Halbach magnet was utilized to generate a magnetic field that was relatively homogeneous on a target plane with a suitable field of view for 2D spatial localization...
March 6, 2017: Sensors
https://www.readbyqxmd.com/read/28252515/factor-viii-mutation-spectrum-in-haemophilia-a-patients-in-the-population-of-henan-china
#14
Nan Bai, Xiaofan Zhu, Zhenhua Zhao, Ying Bai, Qinghua Wu, Ning Liu, Duo Chen, Xiangdong Kong
Defects in the coagulation factor VIII gene cause haemophilia A, which is the most common X-linked recessive bleeding disorder. In total, 45 affected families were investigated to elucidate the factor VIII gene mutation spectrum. The families were subjected to clinical, biochemical, and molecular analyses. Inverse-shifting PCR was first applied to severe haemophilia A patients to identify inversions in introns 22 and 1. Then, next-generation sequencing was performed to detect mutations in inversion-negative patients with severe haemophilia A and moderate-mild haemophilia A patients...
March 1, 2017: Blood Coagulation & Fibrinolysis: An International Journal in Haemostasis and Thrombosis
https://www.readbyqxmd.com/read/28230327/fundamentals-of-diffusion-mri-physics
#15
REVIEW
Valerij G Kiselev
Diffusion MRI is commonly considered the "engine" for probing the cellular structure of living biological tissues. The difficulty of this task is threefold. First, in structurally heterogeneous media, diffusion is related to structure in quite a complicated way. The challenge of finding diffusion metrics for a given structure is equivalent to other problems in physics that have been known for over a century. Second, in most cases the MRI signal is related to diffusion in an indirect way dependent on the measurement technique used...
March 2017: NMR in Biomedicine
https://www.readbyqxmd.com/read/28225761/amplified-stimulated-emission-in-upconversion-nanoparticles-for-super-resolution-nanoscopy
#16
Yujia Liu, Yiqing Lu, Xusan Yang, Xianlin Zheng, Shihui Wen, Fan Wang, Xavier Vidal, Jiangbo Zhao, Deming Liu, Zhiguang Zhou, Chenshuo Ma, Jiajia Zhou, James A Piper, Peng Xi, Dayong Jin
Lanthanide-doped glasses and crystals are attractive for laser applications because the metastable energy levels of the trivalent lanthanide ions facilitate the establishment of population inversion and amplified stimulated emission at relatively low pump power. At the nanometre scale, lanthanide-doped upconversion nanoparticles (UCNPs) can now be made with precisely controlled phase, dimension and doping level. When excited in the near-infrared, these UCNPs emit stable, bright visible luminescence at a variety of selectable wavelengths, with single-nanoparticle sensitivity, which makes them suitable for advanced luminescence microscopy applications...
February 22, 2017: Nature
https://www.readbyqxmd.com/read/28219039/microwave-dielectric-relaxation-spectroscopy-study-of-propylene-glycol-ethanol-binary-mixtures-temperature-dependence
#17
T Vishwam, Suriya Shihab, V R K Murthy, Ha Sie Tiong, S Sreehari Sastry
Complex dielectric permittivity measurements of propylene glycol (PG) in ethanol at various mole fractions were measured by using open-ended coaxial probe technique at different temperatures in the frequency range 0.02<ν/GHz<20. The dipole moment (μ), excess dipole moment (Δμ),excess permittivity (ε(E)), excess inverse relaxation time(1/τ)(E), Bruggeman parameter (fB), excess Helmholtz energy (ΔF(E)) are determined using experimental data. From the minimum energy based geometry optimization, dipole moments of individual monomers of propylene glycol and ethanol and their binary system have been evaluated theoretically at gaseous state as well as alcoholic medium by using PCM and IEFPCM solvation models from the Hatree-Fock (HF) and Density Functional Theory (DFT-B3LYP) methods with 6-311G* and 6-311G** basis sets...
February 11, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28214917/mtss1-promotes-maturation-and-maintenance-of-cerebellar-neurons-via-splice-variant-specific-effects
#18
Thorsten Sistig, Fanziska Lang, Sebastian Wrobel, Stephan L Baader, Karl Schilling, Britta Eiberger
Efficient coupling of the actin cytoskeleton to the cell membrane is crucial for histogenesis and maintenance of the nervous system. At this critical interface, BAR (Bin-Amphiphysin-Rvs) proteins regulate membrane bending, shown to be instrumental for mobility and morphogenesis of individual cells. Yet, the systemic significance of these proteins remains largely unexplored. Here, we probe the role of a prominent member of this protein family, the inverse-BAR protein Mtss1, for the development and function of a paradigmatic neuronal circuit, the cerebellar cortex...
February 18, 2017: Brain Structure & Function
https://www.readbyqxmd.com/read/28205651/metal-support-interaction-on-cobalt-based-ft-catalysts-a-dft-study-of-model-inverse-catalysts
#19
Tracey van Heerden, Eric van Steen
It is challenging to isolate the effect of metal-support interactions on catalyst reaction performance. In order to overcome this problem, inverse catalysts can be prepared in the laboratory and characterized and tested at relevant conditions. Inverse catalysts are catalysts where the precursor to the catalytically active phase is bonded to a support-like ligand. We can then view the metal-support interaction as a ligand interaction with the support acting as a supra-molecular ligand. Importantly, laboratory studies have shown that these ligands are still present after reduction of the catalyst...
February 16, 2017: Faraday Discussions
https://www.readbyqxmd.com/read/28205432/fluorescent-hexose-conjugates-establish-stringent-stereochemical-requirement-by-glut5-for-recognition-and-transport-of-monosaccharides
#20
Olivier-Mohamad Soueidan, Thomas W Scully, Jatinder Kaur, Rashmi Panigrahi, Alexandr Belovodskiy, Victor Do, Carson D Matier, M Joanne Lemieux, Frank Wuest, Chris Cheeseman, F G West
The specificity characteristics of transporters can be exploited for the development of novel diagnostic therapeutic probes. The facilitated hexose transporter family (GLUTs) has a distinct set of preferences for monosaccharide substrates, and while some are expressed ubiquitously (e.g., GLUT1), others are quite tissue specific (e.g., GLUT5, which is overexpressed in some breast cancer tissues). While these differences have enabled the development of new molecular probes based upon hexose- and tissue-selective uptake, substrate design for compounds targeting these GLUT transporters has been encumbered by a limited understanding of the molecular interactions at play in hexose binding and transport...
February 16, 2017: ACS Chemical Biology
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