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https://www.readbyqxmd.com/read/28823067/combined-classical-spindle-cell-pleomorphic-lipoma-spectrum-imaging-and-clinical-data
#1
Yara Younan, Anthony Martinez, Nickolas Reimer, Mark Edgar, Felix Gonzalez, Monica Umpierrez, Ty Subhawong, Adam D Singer
OBJECTIVES: Compile the largest study to date on the imaging and clinical features of the classic spindle cell/pleomorphic lipoma spectrum and suggest this diagnosis be included in the differential for benign and malignant macroscopic fat-containing soft tissue masses regardless of the mass location or patient demographics. MATERIALS AND METHODS: An institutional search was performed to identify all available classic-type spindle cell/pleomorphic lipomas with available demographic and imaging data...
August 19, 2017: Skeletal Radiology
https://www.readbyqxmd.com/read/28822305/an-optimal-control-approach-to-design-entire-relaxation-dispersion-experiments
#2
Thoa T Nguyen, Steffen J Glaser
A general approach is introduced to optimize experiments for the analysis of spin systems in the presence of chemical exchange. Rather than optimizing individual pulse sequence elements, such as refocusing pulses, entire relaxation dispersion sequences are optimized in the form of a single shaped pulse. This is achieved by defining a performance index that is only based on the remaining signal after the relaxation dispersion sequence for a range of exchange, relaxation, offset, and rf inhomogeneity parameters...
July 31, 2017: Journal of Magnetic Resonance
https://www.readbyqxmd.com/read/28821744/exploring-the-sequence-based-prediction-of-folding-initiation-sites-in-proteins
#3
Daniele Raimondi, Gabriele Orlando, Rita Pancsa, Taushif Khan, Wim F Vranken
Protein folding is a complex process that can lead to disease when it fails. Especially poorly understood are the very early stages of protein folding, which are likely defined by intrinsic local interactions between amino acids close to each other in the protein sequence. We here present EFoldMine, a method that predicts, from the primary amino acid sequence of a protein, which amino acids are likely involved in early folding events. The method is based on early folding data from hydrogen deuterium exchange (HDX) data from NMR pulsed labelling experiments, and uses backbone and sidechain dynamics as well as secondary structure propensities as features...
August 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28820711/molecular-epidemiology-of-cholera-outbreaks-during-the-rainy-season-in-mandalay-myanmar
#4
Amonrattana Roobthaisong, Kazuhisa Okada, Nilar Htun, Wah Wah Aung, Warawan Wongboot, Watcharaporn Kamjumphol, Aye Aye Han, Yi Yi, Shigeyuki Hamada
Cholera, caused by Vibrio cholerae, remains a global threat to public health. In Myanmar, the availability of published information on the occurrence of the disease is scarce. We report here that cholera incidence in Mandalay generally exhibited a single annual peak, with an annual average of 312 patients with severe dehydration over the past 5 years (since 2011) and was closely associated with the rainy season. We analyzed cholera outbreaks, characterized 67 isolates of V. cholerae serogroup O1 in 2015 from patients from Mandalay, and compared them with 22 V...
August 14, 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/28817234/osmium-mediated-4su-to-c-transformation-as-key-to-study-rna-dynamics-by-sequencing-tuc-seq
#5
Christian Riml, Thomas Amort, Dietmar Rieder, Catherina Gasser, Alexandra Lusser, Ronald Micura
To understand the functional roles of RNA in the cell, it is essential to elucidate the dynamics of their production, processing and decay. A recent method for assessing mRNA dynamics is metabolic labeling with 4-thiouridine (4sU), followed by thio-selective attachment of affinity tags. Detection of labeled transcripts by affinity purification and hybridization to microarrays or by deep sequencing then reveals RNA expression levels. Here, we present a novel sequencing method that eliminates affinity purification and allows for direct assessment of 4sU labeled RNA...
August 17, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28816462/-1-h-detected-redor-with-fast-magic-angle-spinning-of-a-deuterated-protein
#6
Manali Ghosh, Chad M Rienstra
Rotational echo double resonance (REDOR) is a highly successful method for heteronuclear distance determination in biological solid-state NMR, and 1H detection methods have emerged in recent years as a powerful approach to improving sensitivity and resolution for small sample quantities by utilizing fast magic-angle spinning (>30 kHz) and deuteration strategies. In theory, involving 1H as one of the spins for measuring REDOR effects can greatly increase the distance measurement range, but few experiments of this type have been reported...
August 17, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28811353/the-omeract-rheumatoid-arthritis-magnetic-resonance-imaging-mri-scoring-system-updated-recommendations-by-the-omeract-mri-in-arthritis-working-group
#7
Mikkel Østergaard, Charles G Peterfy, Paul Bird, Frédérique Gandjbakhch, Daniel Glinatsi, Iris Eshed, Espen A Haavardsholm, Siri Lillegraven, Pernille Bøyesen, Bo Ejbjerg, Violaine Foltz, Paul Emery, Harry K Genant, Philip G Conaghan
OBJECTIVE: The Outcome Measures in Rheumatology (OMERACT) Rheumatoid Arthritis (RA) Magnetic Resonance Imaging (MRI) scoring system (RAMRIS), evaluating bone erosion, bone marrow edema/osteitis, and synovitis, was introduced in 2002, and is now the standard method of objectively quantifying inflammation and damage by MRI in RA trials. The objective of this paper was to identify subsequent advances and based on them, to provide updated recommendations for the RAMRIS. METHODS: MRI studies relevant for RAMRIS and technical and scientific advances were analyzed by the OMERACT MRI in Arthritis Working Group, which used these data to provide updated considerations on image acquisition, RAMRIS definitions, and scoring systems for the original and new RA pathologies...
August 15, 2017: Journal of Rheumatology
https://www.readbyqxmd.com/read/28809801/a-unique-and-simple-approach-to-improve-sensitivity-in-15-n-nmr-relaxation-measurements-for-nh%C3%A2-%C3%A2-%C2%BA-groups-application-to-a-protein-dna-complex
#8
Dan Nguyen, Ganesh L R Lokesh, David E Volk, Junji Iwahara
NMR spectroscopy is a powerful tool for research on protein dynamics. In the past decade, there has been significant progress in the development of NMR methods for studying charged side chains. In particular, NMR methods for lysine side-chain NH₃⁺ groups have been proven to be powerful for investigating the dynamics of hydrogen bonds or ion pairs that play important roles in biological processes. However, relatively low sensitivity has been a major practical issue in NMR experiments on NH₃⁺ groups. In this paper, we present a unique and simple approach to improve sensitivity in (15)N relaxation measurements for NH₃⁺ groups...
August 15, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28809496/time-resolved-coherent-anti-stokes-raman-scattering-of-graphene-dephasing-dynamics-of-optical-phonon
#9
Juha Koivistoinen, Pasi Myllyperkiö, Mika Pettersson
We report dynamics of the G-mode in graphene probed with time-resolved coherent anti-Stokes Raman scattering measurements. By applying BOXCARS excitation geometry with three different excitation wavelengths, various nonlinear processes can be selectively detected due to energy and momentum conservation and temporal sequence of the pulses. The Raman signal due to resonant coherent excitation of the G-mode shows exponential decay with lifetime of ∼325 ± 50 fs. This decay time is shorter than expected based on the line width of the G-mode in the Raman spectrum...
August 18, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28809435/first-case-report-of-non-human-primates-alouatta-clamitans-with-the-hypervirulent-klebsiella-pneumoniae-serotype-k1-strain-st-23-a-possible-emerging-wildlife-pathogen
#10
Eleine Kuroki Anzai, Júlio César de Souza Júnior, Amanda Rezende Peruchi, Juliana Mello Fonseca, Elke Kreuscher Gumpl, Antônio Carlos Campos Pignatari, Zelinda Maria Braga Hirano, Alessandro Conrado de Oliveira Silveira
BACKGROUND: Hypervirulent strain of Klebsiella pneumoniae genotype K1 isolates have recently emerged, causing severe pyogenic liver abscess complicated by devastating metastatic infections in humans. METHODS: We describe a short outbreak of the non-human primate (NHP) research center, associated with a hypervirulent K. pneumoniae. The genetic similarity of the strains was evaluated by pulsed-field gel electrophoresis (PFGE) and multilocus sequence typing (MLST) techniques, and virulence encoding genes were detected by polymerase chain reaction (PCR)...
August 15, 2017: Journal of Medical Primatology
https://www.readbyqxmd.com/read/28808823/vessel-wall-characterization-using-quantitative-mri-what-s-in-a-number
#11
REVIEW
Bram F Coolen, Claudia Calcagno, Pim van Ooij, Zahi A Fayad, Gustav J Strijkers, Aart J Nederveen
The past decade has witnessed the rapid development of new MRI technology for vessel wall imaging. Today, with advances in MRI hardware and pulse sequences, quantitative MRI of the vessel wall represents a real alternative to conventional qualitative imaging, which is hindered by significant intra- and inter-observer variability. Quantitative MRI can measure several important morphological and functional characteristics of the vessel wall. This review provides a detailed introduction to novel quantitative MRI methods for measuring vessel wall dimensions, plaque composition and permeability, endothelial shear stress and wall stiffness...
August 14, 2017: Magma
https://www.readbyqxmd.com/read/28807097/genotypic-characterization-of-methicillin-resistant-staphylococcus-aureus-isolated-from-pigs-and-retail-foods-in-china
#12
Wei Wang, Feng Liu, Zulqarnain Baloch, Cun Shan Zhang, Ke Ma, Zi Xin Peng, Shao Fei Yan, Yu Jie Hu, Xin Gan, Yin Ping Dong, Yao Bai, Feng Qin Li, Xiao Mein Yan, Ai Guo Ma, Jin Xu
OBJECTIVE: To investigate the genotypic diversity of Methicillin-resistant Staphylococcus aureus (MRSA) isolated from pigs and retail foods from different geographical areas in China and further to study the routes and rates of transmission of this pathogen from animals to food. METHODS: Seventy-one MRSA isolates were obtained from pigs and retail foods and then characterized by multi-locus sequencing typing (MLST), spa typing, multiple-locus variable number of tandem repeat analysis (MLVA), pulsed-field gel electrophoresis (PFGE), and antimicrobial susceptibility testing...
August 2017: Biomedical and Environmental Sciences: BES
https://www.readbyqxmd.com/read/28806996/improved-passive-catheter-tracking-with-positive-contrast-for-cmr-guided-cardiac-catheterization-using-partial-saturation-psat
#13
Mari Nieves Velasco Forte, Kuberan Pushparajah, Tobias Schaeffter, Israel Valverde Perez, Kawal Rhode, Bram Ruijsink, Mazen Alhrishy, Nicholas Byrne, Amedeo Chiribiri, Tevfik Ismail, Tarique Hussain, Reza Razavi, Sébastien Roujol
BACKGROUND: Cardiac catheterization is a common procedure in patients with congenital heart disease (CHD). Although cardiovascular magnetic resonance imaging (CMR) represents a promising alternative approach to fluoroscopy guidance, simultaneous high contrast visualization of catheter, soft tissue and the blood pool remains challenging. In this study, a novel passive tracking technique is proposed for enhanced positive contrast visualization of gadolinium-filled balloon catheters using partial saturation (pSAT) magnetization preparation...
August 15, 2017: Journal of Cardiovascular Magnetic Resonance
https://www.readbyqxmd.com/read/28802550/mr-coagulation-a-novel-minimally-invasive-approach-to-aneurysm-repair
#14
Ouri Cohen, Ming Zhao, Erez Nevo, Jerome L Ackerman
PURPOSE: To demonstrate a proof of concept of magnetic resonance (MR) coagulation, in which MR imaging scanner-induced radiofrequency (RF) heating at the end of an intracatheter long wire heats and coagulates a protein solution to effect a vascular repair by embolization. MATERIALS AND METHODS: MR coagulation was simulated by finite-element modeling of electromagnetic fields and specific absorption rate (SAR) in a phantom. A glass phantom consisting of a spherical cavity joined to the side of a tube was incorporated into a flow system to simulate an aneurysm and flowing blood with velocities of 0-1...
August 9, 2017: Journal of Vascular and Interventional Radiology: JVIR
https://www.readbyqxmd.com/read/28802243/pulsed-triple-electron-resonance-trier-for-dipolar-correlation-spectroscopy
#15
Stephan Pribitzer, Muhammad Sajid, Miriam Hülsmann, Adelheid Godt, Gunnar Jeschke
A new pulse sequence is presented for correlating dipolar frequencies in molecules with more than two paramagnetic centers. This triple electron resonance experiment (TRIER) is an extension the double electron-electron resonance (DEER) experiment, which is widely used for distance determination in the nanometer range. We use linear chirp pulses with smoothed edges to create a refocused observer echo, and two hyperbolic secant pulses with distinct excitation windows to excite two other subsets of spins. These pumped spins are coupled to the observed spin through the dipole-dipole interaction...
August 1, 2017: Journal of Magnetic Resonance
https://www.readbyqxmd.com/read/28801089/clinical-and-microbiological-characteristics-of-patients-with-bacteremia-caused-by-campylobacter-species-with-an-emphasis-on-the-subspecies-of-c-fetus
#16
Yen-Hung Liu, Wataru Yamazaki, Yu-Tsung Huang, Chun-Hsing Liao, Wang-Hui Sheng, Po-Ren Hsueh
OBJECTIVES: This study was intended to investigate the clinical and microbiological characteristics of patients with bacteremia caused by Campylobacter species. METHODS: From April 1998 to May 2014, 56 adults with bacteremia caused by Campylobacter species were evaluated. These Campylobacter species isolates were confirmed to the species level using 16S rRNA gene sequencing (all isolates) and multiplex PCR analysis (for C. fetus only). The performance of identification for Campylobacter species by the Bruker Biotyper MALDI-TOF MS was evaluated...
July 25, 2017: Journal of Microbiology, Immunology, and Infection, Wei Mian Yu Gan Ran za Zhi
https://www.readbyqxmd.com/read/28799210/whole-brain-arteriography-and-venography-using-improved-velocity-selective-saturation-pulse-trains
#17
Wenbo Li, Feng Xu, Michael Schär, Jing Liu, Taehoon Shin, Yansong Zhao, Peter C M van Zijl, Bruce A Wasserman, Ye Qiao, Qin Qin
PURPOSE: To develop velocity-selective (VS) MR angiography (MRA) protocols for arteriography and venography with whole-brain coverage. METHODS: Tissue suppression using velocity-selective saturation (VSS) pulse trains is sensitive to radiofrequency field (B1 +) inhomogeneity. To reduce its sensitivity, we replaced the low-flip-angle hard pulses in the VSS pulse train with optimal composite (OCP) pulses. Additionally, new pulse sequences for arteriography and venography were developed by placing spatially selective inversion pulses with a delay to null signals from either venous or arterial blood...
August 10, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28799090/prostate-cancer-detection-among-readers-with-different-degree-of-experience-using-ultra-high-b-value-diffusion-weighted-imaging-is-a-non-contrast-protocol-sufficient-to-detect-significant-cancer
#18
D Hausmann, N Aksöz, J von Hardenberg, T Martini, N Westhoff, S Buettner, S O Schoenberg, P Riffel
AIM: To evaluate the accuracy of a T2-weighted (T2w) - and a parallel transmit zoomed b = 2000 s/mm2 (b2000) - diffusion-weighted imaging sequence among three readers with different degrees of experience for prostate cancer (Pca) detection. METHODS: Ninety-three patients with suspected Pca were enrolled. For b2000 a two-dimensional spatially-selective RF pulse using an echo-planar transmit trajectory was applied, and the field of view (FOV) was reduced to one-third...
August 10, 2017: European Radiology
https://www.readbyqxmd.com/read/28798991/a-highly-sensitive-electrochemical-dna-biosensor-from-acrylic-gold-nano-composite-for-the-determination-of-arowana-fish-gender
#19
Mahbubur Rahman, Lee Yook Heng, Dedi Futra, Chew Poh Chiang, Zulkafli A Rashid, Tan Ling Ling
The present research describes a simple method for the identification of the gender of arowana fish (Scleropages formosus). The DNA biosensor was able to detect specific DNA sequence at extremely low level down to atto M regimes. An electrochemical DNA biosensor based on acrylic microsphere-gold nanoparticle (AcMP-AuNP) hybrid composite was fabricated. Hydrophobic poly(n-butylacrylate-N-acryloxysuccinimide) microspheres were synthesised with a facile and well-established one-step photopolymerization procedure and physically adsorbed on the AuNPs at the surface of a carbon screen printed electrode (SPE)...
August 10, 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28797926/accurate-determination-of-chemical-shift-tensor-orientations-of-single-crystals-by-solid-state-magic-angle-spinning-nmr
#20
Yamini S Avadhut, Johannes Weber, Jörn Schmedt Auf der Günne
An improved implementation of single-crystal magic-angle-spinning (MAS) NMR is presented which gives access to chemical shift tensors both in orientation (relative to the crystal axis system) and principal axis values. For mounting arbitrary crystals inside ordinary MAS rotors, a mounting tool is described which allows to relate the crystal orientation determined by diffraction techniques to the rotor coordinate system. The crystal is finally mounted into a MAS rotor equipped with a special insert which allows a defined reorientation of the single-crystal by 90°...
July 24, 2017: Journal of Magnetic Resonance
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