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Magnetization transfer

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https://www.readbyqxmd.com/read/28098142/carbon-translocation-from-a-plant-to-an-insect-pathogenic-endophytic-fungus
#1
Scott W Behie, Camila C Moreira, Irina Sementchoukova, Larissa Barelli, Paul M Zelisko, Michael J Bidochka
Metarhizium robertsii is a common soil fungus that occupies a specialized ecological niche as an endophyte and an insect pathogen. Previously, we showed that the endophytic capability and insect pathogenicity of Metarhizium are coupled to provide an active method of insect-derived nitrogen transfer to a host plant via fungal mycelia. We speculated that in exchange for this insect-derived nitrogen, the plant would provide photosynthate to the fungus. By using (13)CO2, we show the incorporation of (13)C into photosynthate and the subsequent translocation of (13)C into fungal-specific carbohydrates (trehalose and chitin) in the root/endophyte complex...
January 18, 2017: Nature Communications
https://www.readbyqxmd.com/read/28096269/differentiation-between-radiation-necrosis-and-tumor-progression-using-chemical-exchange-saturation-transfer
#2
Hatef Mehrabian, Kimberly L Desmond, Hany Soliman, Arjun Sahgal, Gregory J Stanisz
PURPOSE: Stereotactic radiosurgery (SRS) is a common treatment used in patients with brain metastases and is associated with high rates of local control, however, at the risk of radiation necrosis. It is difficult to differentiate radiation necrosis from tumor progression using conventional MRI making it a major diagnostic dilemma for practitioners. This prospective study investigated whether chemical exchange saturation transfer (CEST) was able to differentiate these two conditions. MATERIALS & METHODS: Fifteen patients with brain metastases who had been previously treated with SRS were included...
January 17, 2017: Clinical Cancer Research: An Official Journal of the American Association for Cancer Research
https://www.readbyqxmd.com/read/28095792/multi-contrast-brain-magnetic-resonance-image-super-resolution-using-the-local-weight-similarity
#3
Hong Zheng, Xiaobo Qu, Zhengjian Bai, Yunsong Liu, Di Guo, Jiyang Dong, Xi Peng, Zhong Chen
BACKGROUND: Low-resolution images may be acquired in magnetic resonance imaging (MRI) due to limited data acquisition time or other physical constraints, and their resolutions can be improved with super-resolution methods. Since MRI can offer images of an object with different contrasts, e.g., T1-weighted or T2-weighted, the shared information between inter-contrast images can be used to benefit super-resolution. METHODS: In this study, an MRI image super-resolution approach to enhance in-plane resolution is proposed by exploring the statistical information estimated from another contrast MRI image that shares similar anatomical structures...
January 17, 2017: BMC Medical Imaging
https://www.readbyqxmd.com/read/28094365/adsorbing-the-3d-transition-metal-atoms-to-effectively-modulate-the-electronic-and-magnetic-behaviors-of-zigzag-sic-nanoribbons
#4
Hui Li, Wei Chen, Xiaopeng Shen, Jingwei Liu, Xuri Huang, Guangtao Yu
On the basis of first-principles computations, we propose a simple and effective strategy through surface-adsorbing 3d-transition metal (TM) atoms, including Ti, Cr, Mn, Fe and Co, to modulate the electronic and magnetic behaviors of zigzag SiC nanoribbons (zSiCNRs), in view of the unique d electronic structures and intrinsic magnetic moments of TM atoms. It is revealed that like applying an electric field, the adsorption of these transition metal atoms can induce an evident change in the electrostatic potential of the substrate zSiCNRs owing to the electron transfer from the TM atom to the substrate...
January 17, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28093197/influence-of-the-bacterial-growth-phase-on-the-magnetic-properties-of-magnetosomes-synthesized-by-magnetospirillum-gryphiswaldense
#5
L Marcano, A García-Prieto, D Muñoz, L Fernández Barquín, I Orue, J Alonso, A Muela, M L Fdez-Gubieda
BACKGROUND: The magnetosome biosynthesis is a genetically controlled process but the physical properties of the magnetosomes can be slightly tuned by modifying the bacterial growth conditions. METHODS: We designed two time-resolved experiments in which iron-starved bacteria at the mid-logarithmic phase are transferred to Fe-supplemented medium to induce the magnetosomes biogenesis along the exponential growth or at the stationary phase. We used flow cytometry to determine the cell concentration, transmission electron microscopy to image the magnetosomes, DC and AC magnetometry methods for the magnetic characterization, and X-ray absorption spectroscopy to analyze the magnetosome structure...
January 12, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28092380/chromatin-immunoprecipitation-in-microfluidic-droplets-towards-fast-and-cheap-analyses
#6
Bruno Teste, Jerome Champ, Arturo Londono-Vallejo, Stéphanie Descroix, Laurent Malaquin, Jean-Louis Viovy, Irena Draskovic, Guillaume Mottet
Genetic organization is governed by the interaction of DNA with histone proteins, and differential modifications of these proteins is a fundamental mechanism of gene regulation. Histone modifications are primarily studied through chromatin immunoprecipitation (ChIP) assays, however conventional ChIP procedures are time consuming, laborious and require a large number of cells. Here we report for the first time the development of ChIP in droplets based on a microfluidic platform combining nanoliter droplets, magnetic beads (MB) and magnetic tweezers (MT)...
January 16, 2017: Lab on a Chip
https://www.readbyqxmd.com/read/28092321/dexmedetomidine-disrupts-the-local-and-global-efficiencies-of-large-scale-brain-networks
#7
Javeria A Hashmi, Marco L Loggia, Sheraz Khan, Lei Gao, Jieun Kim, Vitaly Napadow, Emery N Brown, Oluwaseun Akeju
BACKGROUND: A clear understanding of the neural basis of consciousness is fundamental to research in clinical and basic neuroscience disciplines and anesthesia. Recently, decreased efficiency of information integration was suggested as a core network feature of propofol-induced unconsciousness. However, it is unclear whether this finding can be generalized to dexmedetomidine, which has a different molecular target. METHODS: Dexmedetomidine was administered as a 1-μg/kg bolus over 10 min, followed by a 0...
January 16, 2017: Anesthesiology
https://www.readbyqxmd.com/read/28091651/composition-dependent-charge-transfer-and-phase-separation-in-the-v1-xrexo2-solid-solution
#8
D Mikhailova, N N Kuratieva, Y Utsumi, A A Tsirlin, A M Abakumov, M Schmidt, S Oswald, H Fuess, H Ehrenberg
The substitution of vanadium in vanadium dioxide VO2 influences the critical temperatures of structural and metal-to-insulator transitions in different ways depending on the valence of the dopant. Rhenium adopts valence states between +4 and +7 in an octahedral oxygen surrounding and is particularly interesting in this context. Structural investigation of V1-xRexO2 solid solutions (0.01 ≤ x ≤ 0.30) between 80 and 1200 K using synchrotron X-ray powder diffraction revealed only two polymorphs that resemble VO2: the low-temperature monoclinic MoO2-type form (space group P21/c), and the tetragonal rutile-like form (space group P42/mnm)...
January 16, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28090588/quantitative-magnetization-transfer-imaging-of-the-breast-at-3-0-t-reproducibility-in-healthy-volunteers
#9
Lori R Arlinghaus, Richard D Dortch, Jennifer G Whisenant, Hakmook Kang, Richard G Abramson, Thomas E Yankeelov
Quantitative magnetization transfer magnetic resonance imaging provides a means for indirectly detecting changes in the macromolecular content of tissue noninvasively. A potential application is the diagnosis and assessment of treatment response in breast cancer; however, before quantitative magnetization transfer imaging can be reliably used in such settings, the technique's reproducibility in healthy breast tissue must be established. Thus, this study aims to establish the reproducibility of the measurement of the macromolecular-to-free water proton pool size ratio (PSR) in healthy fibroglandular (FG) breast tissue...
December 2016: Tomography: a Journal for Imaging Research
https://www.readbyqxmd.com/read/28086905/reduction-of-eddy-current-losses-in-inductive-transmission-systems-with-ferrite-sheets
#10
Matthias Maaß, Andreas Griessner, Viktor Steixner, Clemens Zierhofer
BACKGROUND: Improvements in eddy current suppression are necessary to meet the demand for increasing miniaturization of inductively driven transmission systems in industrial and biomedical applications. The high magnetic permeability and the simultaneously low electrical conductivity of ferrite materials make them ideal candidates for shielding metallic surfaces. For systems like cochlear implants the transmission of data as well as energy over an inductive link is conducted within a well-defined parameter set...
January 5, 2017: Biomedical Engineering Online
https://www.readbyqxmd.com/read/28081081/compact-broadband-polarization-beam-splitter-using-a-symmetric-directional-coupler-with-sinusoidal-bends
#11
Fan Zhang, Han Yun, Yun Wang, Zeqin Lu, Lukas Chrostowski, Nicolas A F Jaeger
We design and demonstrate a compact broadband polarization beam splitter (PBS) using a symmetric directional coupler with sinusoidal bends on a silicon-on-insulator platform. The sinusoidal bends in our PBS suppress the power exchange between two parallel symmetric strip waveguides for the transverse-electric (TE) mode, while allowing for the maximum power transfer to the adjacent waveguide for the transverse-magnetic (TM) mode. Our PBS has a nominal coupler length of 8.55 μm, and it has an average extinction ratio (ER) of 12...
January 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/28079947/an-unusually-delocalized-mixed-valence-state-of-a-cyanidometal-bridged-compound-induced-by-thermal-electron-transfer
#12
Xiao Ma, Chen-Sheng Lin, Xiao-Quan Zhu, Sheng-Min Hu, Tian-Lu Sheng, Xin-Tao Wu
The heterometallic complexes trans-[Cp(dppe)FeNCRu(o-bpy)CNFe(dppe)Cp][PF6 ]n (1[PF6 ]n , n=2, 3, 4; o-bpy=1,2-bis(2,2'-bipyridyl-6-yl)ethane, dppe=1,2-bis(diphenylphosphino)ethane, Cp=1,3-cyclopentadiene) in three distinct states have been synthesized and fully characterized. 1(3+) [PF6 ]3 and 1(4+) [PF6 ]4 are the one- and two-electron oxidation products of 1(2+) [PF6 ]2 , respectively. The investigated results suggest that 1[PF6 ]3 is a Class II mixed valence compound. 1[PF6 ]4 after a thermal treatment at 400 K shows an unusually delocalized mixed valence state of [Fe(III) -NC-Ru(III) -CN-Fe(II) ], which is induced by electron transfer from the central Ru(II) to the terminal Fe(III) in 1[PF6 ]4 , which was confirmed by IR spectroscopy, magnetic data, and EPR and Mössbauer spectroscopy...
January 12, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28075559/one-component-supramolecular-filament-hydrogels-as-theranostic-label-free-magnetic-resonance-imaging-agents
#13
Lye Lin Lock, Yuguo Li, Xinpei Mao, Hanwei Chen, Verena Staedtke, Renyuan Bai, Wang Ma, Ran Lin, Yi Li, Guanshu Liu, Honggang Cui
Gadolinium (Gd)-based compounds and materials are the most commonly used magnetic resonance imaging (MRI) contrast agents in the clinic; however, safety concerns associated with their toxicities in the free ionic form have promoted the development of new generations of metal-free contrast agents. Here we report a supramolecular strategy to convert an FDA-approved anticancer drug, Pemetrexed (Pem), to a molecular hydrogelator with inherent chemical exchange saturation transfer (CEST) MRI signals. The rationally designed drug-peptide conjugate can spontaneously associate into filamentous assemblies under physiological conditions and consequently form theranostic supramolecular hydrogels for injectable delivery...
January 11, 2017: ACS Nano
https://www.readbyqxmd.com/read/28071647/colossal-negative-thermal-expansion-in-reduced-layered-ruthenate
#14
Koshi Takenaka, Yoshihiko Okamoto, Tsubasa Shinoda, Naoyuki Katayama, Yuki Sakai
Large negative thermal expansion (NTE) has been discovered during the last decade in materials of various kinds, particularly materials associated with a magnetic, ferroelectric or charge-transfer phase transition. Such NTE materials have attracted considerable attention for use as thermal-expansion compensators. Here, we report the discovery of giant NTE for reduced layered ruthenate. The total volume change related to NTE reaches 6.7% in dilatometry, a value twice as large as the largest volume change reported to date...
January 10, 2017: Nature Communications
https://www.readbyqxmd.com/read/28068970/quadriplegia-caused-by-an-epidural-abscess-occurring-at-the-same-level-of-cervical-destructive-spondyloarthropathy-a-case-report
#15
Jun-Seok Lee, Ji-Hyun Ryu, Jong-Tae Park, Ki-Won Kim
BACKGROUND: Destructive spondyloarthropathy (DSA) is one of the major complications in patients undergoing long-term hemodialysis. To the best of our knowledge, an epidural abscess occurring at the level of preexisting cervical DSA has not been well described in the literature. We report a unique case of quadriplegia caused by an epidural abscess occurring at the same level of preexisting cervical DSA. CASE PRESENTATION: A 49-year-old woman was transferred to our emergency department with 5 days of sepsis, drowsy mental status, and quadriplegia below the C5 level...
January 10, 2017: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/28067263/physiological-remediation-of-cobalt-ferrite-nanoparticles-by-ferritin
#16
Jeanne Volatron, Jelena Kolosnjaj-Tabi, Yasir Javed, Quoc Lam Vuong, Yves Gossuin, Sophie Neveu, Nathalie Luciani, Miryana Hémadi, Florent Carn, Damien Alloyeau, Florence Gazeau
Metallic nanoparticles have been increasingly suggested as prospective therapeutic nanoplatforms, yet their long-term fate and cellular processing in the body is poorly understood. Here we examined the role of an endogenous iron storage protein - namely the ferritin - in the remediation of biodegradable cobalt ferrite magnetic nanoparticles. Structural and elemental analysis of ferritins close to exogenous nanoparticles within spleens and livers of mice injected in vivo with cobalt ferrite nanoparticles, suggests the intracellular transfer of degradation-derived cobalt and iron, entrapped within endogenous protein cages...
January 9, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28067035/robust-interfacial-exchange-bias-and-metal-insulator-transition-influenced-by-the-lanio3-layer-thickness-in-la0-7sr0-3mno3-lanio3-superlattices
#17
Guowei Zhou, Cheng Song, Yuhao Bai, Zhiyong Quan, Fengxian Jiang, Wenqing Liu, Yongbing Xu, Sarnjeet S Dhesi, Xiaohong Xu
Artificial heterostructures based on LaNiO3 (LNO) have been widely investigated with the aim to realize the insulating antiferromagnetic state of LNO. In this work, we grew [(La0.7Sr0.3MnO3)5-(LaNiO3)n]12 superlattices on (001)-oriented SrTiO3 substrates by pulsed laser deposition and observed an unexpected exchange bias effect in field-cooled hysteresis loops. Through X-ray absorption spectroscopy and magnetic circular dichroism experiments, we found that the charge transfer at the interfacial Mn and Ni ions can induce a localized magnetic moment...
January 13, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28066805/evaluation-of-soft-tissue-sarcoma-response-to-preoperative-chemoradiotherapy-using-dynamic-contrast-enhanced-magnetic-resonance-imaging
#18
Wei Huang, Brooke R Beckett, Alina Tudorica, Janelle M Meyer, Aneela Afzal, Yiyi Chen, Atiya Mansoor, James B Hayden, Yee-Cheen Doung, Arthur Y Hung, Megan L Holtorf, Torrie J Aston, Christopher W Ryan
This study aims to assess the utility of quantitative dynamic contrast-enhanced (DCE) magnetic resonance imaging (MRI) parameters in comparison with imaging tumor size for early prediction and evaluation of soft tissue sarcoma response to preoperative chemoradiotherapy. In total, 20 patients with intermediate- to high-grade soft tissue sarcomas received either a phase I trial regimen of sorafenib + chemoradiotherapy (n = 8) or chemoradiotherapy only (n = 12), and underwent DCE-MRI at baseline, after 2 weeks of treatment with sorafenib or after the first chemotherapy cycle, and after therapy completion...
December 2016: Tomography: a Journal for Imaging Research
https://www.readbyqxmd.com/read/28063447/accelerating-two-dimensional-nuclear-magnetic-resonance-correlation-spectroscopy-via-selective-coherence-transfer
#19
Qimiao Ye, Lin Chen, Wenqi Qiu, Liangjie Lin, Huijun Sun, Shuhui Cai, Zhiliang Wei, Zhong Chen
Nuclear magnetic resonance (NMR) spectroscopy serves as an important tool for both qualitative and quantitative analyses of various systems in chemistry, biology, and medicine. However, applications of one-dimensional (1)H NMR are often restrained by the presence of severe overlap among different resonances. The advent of two-dimensional (2D) (1)H NMR constitutes a promising alternative by extending the crowded resonances into a plane and thereby alleviating the spectral congestions. However, the enhanced ability in discriminating resonances is achieved at the cost of extended experimental duration due to necessity of various scans with progressive delays to construct the indirect dimension...
January 7, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28063445/influence-of-dy-3-and-tb-3-doping-on-13-c-dynamic-nuclear-polarization
#20
Peter Niedbalski, Christopher Parish, Andhika Kiswandhi, Leila Fidelino, Chalermchai Khemtong, Zahra Hayati, Likai Song, André Martins, A Dean Sherry, Lloyd Lumata
Dynamic nuclear polarization (DNP) is a technique that uses a microwave-driven transfer of high spin alignment from electrons to nuclear spins. This is most effective at low temperature and high magnetic field, and with the invention of the dissolution method, the amplified nuclear magnetic resonance (NMR) signals in the frozen state in DNP can be harnessed in the liquid-state at physiologically acceptable temperature for in vitro and in vivo metabolic studies. A current optimization practice in dissolution DNP is to dope the sample with trace amounts of lanthanides such as Gd(3+) or Ho(3+), which further improves the polarization...
January 7, 2017: Journal of Chemical Physics
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