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https://www.readbyqxmd.com/read/28106936/whole-brain-vessel-wall-mri-a-parameter-tune-up-solution-to-improve-the-scan-efficiency-of-three-dimensional-variable-flip-angle-turbo-spin-echo
#1
Qi Yang, Zixin Deng, Xiaoming Bi, Shlee S Song, Konrad H Schlick, Nestor R Gonzalez, Debiao Li, Zhaoyang Fan
PURPOSE: To propose and evaluate a parameter tune-up solution to expedite a three-dimensional (3D) variable-flip-angle turbo spin-echo (TSE) sequence for whole-brain intracranial vessel wall (IVW) imaging. MATERIALS AND METHODS: Elliptical k-space sampling and prolonged echo train length (ETL), were used to expedite a 3D variable-flip-angle TSE-based sequence. To compensate for the potential loss in vessel wall signal, optimal combination of prescribed T2 and ETL was experimentally investigated on 22 healthy volunteers at 3 Tesla...
January 20, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28106534/extrinsic-rashba-spin-orbit-coupling-effect-on-silicene-spin-polarized-field-effect-transistors
#2
Nezhat Pournaghavi, Mahdi Esmaeilzadeh, Adib Abrishamifar, Somaieh Ahmadi
Regarding the spin field effect transistor (spin FET) challenges such as mismatch effect in spin injection and insufficient spin life time, we propose a silicene based device which can be a promising candidate to overcome some of those problems. Using non-equilibrium Green���s function method, we investigate the spin-dependent conductance in a zigzag silicene nanoribbon connected to two magnetized leads which are supposed to be either in parallel or anti-parallel configurations. For both configurations, a controllable spin current can be obtained when the Rashba effect is present; thus, we can have a spin filter device...
January 20, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28106399/-1-h-nmr-shows-slow-phospholipid-flip-flop-in-gel-and-fluid-bilayers
#3
Drew Marquardt, Frederick A Heberle, Tatiana Miti, Barbara Eicher, Erwin London, John Katsaras, Georg Pabst
We measured the transbilayer diffusion of 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC) in large unilamellar vesicles in both the gel (Lβ') and fluid (Lα) phases. The choline resonance of headgroup-protiated DPPC exchanged into the outer leaflet of headgroup-deuterated DPPC-d13 vesicles was monitored using (1)H NMR spectroscopy coupled with the addition of a paramagnetic shift reagent. This allowed us to distinguish between the inner and outer leaflet DPPC, and determine the flip-flop rate as a function of temperature...
January 20, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28103409/zea-mays-fe-deficiency-related-4-zmfdr4-functions-as-an-iron-transporter-in-the-plastids-of-monocots
#4
Xiu-Yue Zhang, Xi Zhang, Qi Zhang, Xiao-Xi Pan, Luo-Chen Yan, Xiao-Juan Ma, Wei-Zhong Zhao, Xiao-Ting Qi, Li-Ping Yin
Iron (Fe)-homeostasis in the plastids is closely associated with Fe transport proteins that prevent Fe from occurring in its toxic free ionic forms. However, the number of known protein families related to Fe transport in the plastids (about 5) and the function of iron in non-green plastids is limited. In the present study, we report the functional characterization of Zea mays Fe deficiency-related 4 (ZmFDR4), which was isolated from a differentially expressed clone of a cDNA library of Fe deficiency-induced maize roots...
January 19, 2017: Plant Journal: for Cell and Molecular Biology
https://www.readbyqxmd.com/read/28100776/crystallographic-snapshots-of-class-a-%C3%AE-lactamase-catalysis-reveal-structural-changes-that-facilitate-%C3%AE-lactam-hydrolysis
#5
Xuehua Pan, Yunjiao He, Jinping Lei, Xuhui Huang, Yanxiang Zhao
β-lactamases confer resistance to β-lactam-based antibiotics. There is great interest in understanding their mechanisms to enable the development of β-lactamase-specific inhibitors. The mechanism of Class A β-lactamases has been studied extensively, revealing Lys73 and Glu166 as general bases that assist the catalytic residue Ser70. However, the specific roles of these two residues within the catalytic cycle remains not fully understood. To help resolve this question, we first identified a Glu166His mutant that is functional but kinetically slowed...
January 18, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28099896/hypothalamic-micrornas-flip-the-switch-for-fertility
#6
EDITORIAL
Andrea Messina, Vincent Prevot
No abstract text is available yet for this article.
January 13, 2017: Oncotarget
https://www.readbyqxmd.com/read/28097749/positive-contrast-from-cells-labeled-with-iron-oxide-nanoparticles-quantitation-of-imaging-data
#7
Sergey Magnitsky, Jinjin Zhang, Djaudat Idiyatullin, Geetha Mohan, Michael Garwood, Nancy E Lane, Sharmila Majumdar
PURPOSE: Conventional T2 -weighted MRI produces a hypointense signal from iron-labeled cells, which renders quantification unfeasible. We tested a SWeep Imaging with Fourier Transformation (SWIFT) MRI pulse sequence to generate a quantifiable hyperintense signal from iron-labeled cells. METHODS: Mesenchymal stem cells (MSCs) were labeled with different concentrations of iron oxide particles and examined for cell viability, proliferation, and differentiation. The SWIFT sequence was optimized to detect and quantify the amount of iron in the muscle tissue after injection of iron oxide solution and iron-labeled MSCs...
January 17, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28097733/optimized-amplitude-modulated-multiband-rf-pulse-design
#8
Samy Abo Seada, Anthony N Price, Joseph V Hajnal, Shaihan J Malik
PURPOSE: Multiband pulses are characterized by highly temporally modulated waveforms. Rapid phase or frequency modulation can be extremely demanding on the performance of radiofrequency (RF) pulse generation, which can lead to errors that can be avoided if pulses are restricted to amplitude modulation (AM) only. In this work, three existing multiband pulse design techniques are modified to produce AM waveforms. THEORY AND METHODS: Multiband refocusing pulses were designed using phase optimization, time shifting, and root flipping...
January 17, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28096733/diagnosis-of-nerve-root-compromise-of-the-lumbar-spine-evaluation-of-the-performance-of-three-dimensional-isotropic-t2-weighted-turbo-spin-echo-space-sequence-at-3t
#9
Jinkyeong Sung, Won-Hee Jee, Joon-Yong Jung, Jinhee Jang, Jin-Sung Kim, Young-Hoon Kim, Kee-Yong Ha
OBJECTIVE: To explore the performance of three-dimensional (3D) isotropic T2-weighted turbo spin-echo (TSE) sampling perfection with application optimized contrasts using different flip angle evolution (SPACE) sequence on a 3T system, for the evaluation of nerve root compromise by disc herniation or stenosis from central to extraforaminal location of the lumbar spine, when used alone or in combination with conventional two-dimensional (2D) TSE sequence. MATERIALS AND METHODS: Thirty-seven patients who had undergone 3T spine MRI including 2D and 3D sequences, and had subsequent spine surgery for nerve root compromise at a total of 39 nerve levels, were analyzed...
January 2017: Korean Journal of Radiology: Official Journal of the Korean Radiological Society
https://www.readbyqxmd.com/read/28095878/black-blood-thrombus-imaging-bti-a-contrast-free-cardiovascular-magnetic-resonance-approach-for-the-diagnosis-of-non-acute-deep-vein-thrombosis
#10
Guoxi Xie, Hanwei Chen, Xueping He, Jianke Liang, Wei Deng, Zhuonan He, Yufeng Ye, Qi Yang, Xiaoming Bi, Xin Liu, Debiao Li, Zhaoyang Fan
BACKGROUND: Deep vein thrombosis (DVT) is a common but elusive illness that can result in long-term disability or death. Accurate detection of thrombosis and assessment of its size and distribution are critical for treatment decision-making. In the present study, we sought to develop and evaluate a cardiovascular magnetic resonance (CMR) black-blood thrombus imaging (BTI) technique, based on delay alternating with nutation for tailored excitation black-blood preparation and variable flip angle turbo-spin-echo readout, for the diagnosis of non-acute DVT...
January 18, 2017: Journal of Cardiovascular Magnetic Resonance
https://www.readbyqxmd.com/read/28094889/selective-electrochemical-bleaching-of-the-outer-leaflet-of-fluorescently-labelled-giant-liposomes
#11
Olivier Buriez, Ana Isabel Perez Jimenez, Lylian Challier, Eric Aït-Yahiatène, Jerome Delacotte, Eric Labbe
Electrochemistry and confocal fluorescence microscopy were successfully combined to selectively bleach and monitor the fluorescence of NBD-labelled phospholipids of giant liposomes. Three types of giant unilamellar vesicles have been investigated, the fluorescent phospholipids being localized either mainly on their outer-, inner-, or both inner/outer leaflets. We established that only the fluorescent lipids incorporated in the outer leaflet of the vesicles underwent electrochemical bleaching upon reduction...
January 17, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28092835/effects-of-the-central-potassium-ions-on-the-g-quadruplex-and-stabilizer-binding
#12
Zhiguo Wang, Jun-Ping Liu
Human telomeres undertake the structure of intra-molecular parallel G-quadruplex in the presence of K(+) in eukaryotic cell. Stabilization of the telomere G-quadruplex represents a potential strategy to prevent telomere lengthening by telomerase in cancer therapy. Current work demonstrates that the binding of central K(+) with the parallel G-quadruplex is a coordinated water directed step-wise process. The K(+) above the top G-tetrad is prone to leak into environment and the 5'-adenine quickly flips over the top G-tetrad, leading to the bottom gate of G-tetrads as the only viable pathway of K(+) binding...
January 6, 2017: Journal of Molecular Graphics & Modelling
https://www.readbyqxmd.com/read/28092785/integrated-ssfp-for-functional-brain-mapping-at-7t-with-reduced-susceptibility-artifact
#13
Kaibao Sun, Rong Xue, Peng Zhang, Zhentao Zuo, Zhongwei Chen, Bo Wang, Thomas Martin, Yi Wang, Lin Chen, Sheng He, Danny J J Wang
Balanced steady-state free precession (bSSFP) offers an alternative and potentially important tool to the standard gradient-echo echo-planar imaging (GE-EPI) for functional MRI (fMRI). Both passband and transition band based bSSFP have been proposed for fMRI. The applications of these methods, however, are limited by banding artifacts due to the sensitivity of bSSFP signal to off-resonance effects. In this article, a unique case of the SSFP-FID sequence, termed integrated-SSFP or iSSFP, was proposed to overcome the obstacle by compressing the SSFP profile into the width of a single voxel...
December 30, 2016: Journal of Magnetic Resonance
https://www.readbyqxmd.com/read/28092744/quercetin-induces-apoptosis-and-autophagy-in-primary-effusion-lymphoma-cells-by-inhibiting-pi3k-akt-mtor-and-stat3-signaling-pathways
#14
Marisa Granato, Celeste Rizzello, Maria Saveria Gilardini Montani, Laura Cuomo, Marina Vitillo, Roberta Santarelli, Roberta Gonnella, Gabriella D'Orazi, Alberto Faggioni, Mara Cirone
Quercetin, a bioflavonoid contained in several vegetables daily consumed, has been studied for long time for its antiinflammatory and anticancer properties. Quercetin interacts with multiple cancer-related pathways such as PI3K/AKT, Wnt/β-catenin and STAT3. These pathways are hyperactivated in primary effusion lymphoma (PEL), an aggressive B cell lymphoma whose pathogenesis is strictly linked to the oncogenic virus Kaposis' Sarcoma-associated Herpesvirus (KSHV). In this study, we found that quercetin inhibited PI3K/AKT/mTOR and STAT3 pathways in PEL cells, and as a consequence, it down-regulated the expression of the prosurvival cellular proteins such as c-FLIP, cyclin D1 and cMyc...
January 5, 2017: Journal of Nutritional Biochemistry
https://www.readbyqxmd.com/read/28088430/flipping-the-classroom-case-based-learning-accountability-assessment-and-feedback-leads-to-a-favorable-change-in-culture
#15
Nahush A Mokadam, Todd F Dardas, Joshua L Hermsen, Jay D Pal, Michael S Mulligan, L Myria Jacobs, Douglas E Wood, Edward D Verrier
OBJECTIVE: The 88-week Thoracic Surgery Curriculum is challenging to implement because of the large content in a traditional lecture format. This study investigates flipping the classroom by using a case-based format designed to stimulate resident preparation and engagement. METHODS: The didactic conference format was altered. Curricular reading assignments, case review, and conference participation prepared residents for novel formative assessment quizzes. Ten residents participated, and faculty served as controls...
December 19, 2016: Journal of Thoracic and Cardiovascular Surgery
https://www.readbyqxmd.com/read/28079371/a-binding-pose-flip-explained-via-enthalpic-and-entropic-contributions
#16
Michael Schauperl, Paul Czodrowski, Julian E Fuchs, Roland G Huber, Birgit J Waldner, Maren Podewitz, Christian Kramer, Klaus R Liedl
The anomalous binding modes of five highly similar fragments of TIE2 inhibitors, showing three distinct binding poses are investigated. We report a quantitative rationalization for the changes in binding pose based on molecular dynamics simulations. We investigated five fragments in complex with the transforming growth factor β receptor type 1 kinase domain. Analyses of these simulations using Grid Inhomogeneous Solvation Theory (GIST), pKA calculations, and a tool to investigate enthalpic differences upon binding unraveled the various thermodynamic contributions to the different binding modes...
January 12, 2017: Journal of Chemical Information and Modeling
https://www.readbyqxmd.com/read/28079359/pristine-graphene-electrode-in-hydrogen-evolution-reaction
#17
Aozhen Xie, Ningning Xuan, Kun Ba, Zhengzong Sun
Graphene, the sp2 carbonaceous two dimensional (2D) material, is gaining more attentions in recent electrochemical studies. However, this atomic thick electrode usually suffers with surface contamination and poor electrochemical endurance. To overcome the drawbacks, we developed a PMMA-assisted, flipped transfer method to fabricate the graphene electrode with pristine surface and prolonged lifetime in hydrogen evolution reaction (HER). The HER performances of the single-layer graphene (SLG) were evaluated on various insulating and conductive substrates, including SiO2, polymers, SLG, highly oriented pyrolytic graphite (HOPG), and copper...
January 12, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28075327/orbital-driven-impurity-spin-effect-on-the-magnetic-order-of-quasi-three-dimensional-cupric-oxide
#18
B Ganga, P Santhosh, B R K Nanda
Density functional calculations are performed to study the magnetic order of the severely distorted square planar cupric oxide (CuO) and local spin disorder in it in the presence of the transition metal impurities M (= Cr, Mn, Fe, Co and Ni). The distortion in the crystal structure, arisen to reduce the band energy by minimizing the covalent interaction, creates two crisscrossing zigzag spin-1/2 chains. From the spin dimer analysis we find that while the spin chain along [101 ��] has strong Heisenberg type antiferromagnetic coupling (J ~ 127 meV), along [101] it exhibits weak, but robust, ferromagnetic coupling (J ~ 9 meV) mediated by reminiscent p-d covalent interactions...
January 11, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28074609/rapid-chemical-shift-encoding-with-single-acquisition-single-slab-3d-grase
#19
Hahnsung Kim, Dong-Hyun Kim, Chul-Ho Sohn, Jaeseok Park
PURPOSE: To investigate the feasibility of chemical shift encoded, single-slab 3D GRASE for rapid fat-water separation within a single acquisition. METHODS: The proposed method incorporates signal-to-noise-ratio-optimal chemical shift encoding into single-slab 3D GRASE with variable flip angles. Chemical shift induced phase information was encoded in succession to different positions in k-space by inserting phase encoding blips between adjacent lobes of the oscillating readout gradients...
January 11, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28074576/decisions-and-authority
#20
Gregory E Kaebnick
This issue of the Hastings Center Report (January-February 2017) features three articles exploring aspects of decision-making for others. In the first two, the focus is on the limits of surrogate decision-makers' authority when the surrogates' judgments about a patient's treatment conflict with the physicians'. If a physician decides that a patient will not benefit from CPR, for example, but the patient's surrogate insists on it, is the physician obliged to proceed with the procedure? Or can the physician, pointing to a duty to provide good care to the patient and not to cause the patient to suffer, get a do-not-resuscitate order for the patient-even in the face of the surrogate's objections? These are the questions that animate the first article, in which a group of authors report on a policy implemented at Massachusetts General Hospital to help doctors who face this dilemma...
January 2017: Hastings Center Report
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