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https://www.readbyqxmd.com/read/27922231/evaluation-of-central-nervous-system-in-patients-with-glycogen-storage-disease-type-1a
#1
Yusuf Aydemir, Figen Gürakan, İnci Nur Saltık Temizel, Hülya Demir, Kader Karlı Oğuz, Dilek Yalnızoğlu, Meral Topçu, Hasan Özen, Aysel Yüce
We aimed to evaluate structure and functions of central nervous system (CNS) in children with glycogen storage disease (GSD) type 1a. Neurological examination, psychometric tests, electroencephalography (EEG), magnetic resonance imaging (MRI), visual evoked potentials (VEP) and brainstem auditory evoked potentials (BAEP) were performed. The results were compared between patients with good and poor metabolic control and healthy children. Twenty-three patients with GSD type 1a were studied. Twelve patients were in poor metabolic control group and 11 patients in good metabolic control group...
2016: Turkish Journal of Pediatrics
https://www.readbyqxmd.com/read/27922124/convex-analysis-of-mixtures-for-separating-non-negative-well-grounded-sources
#2
Yitan Zhu, Niya Wang, David J Miller, Yue Wang
Blind Source Separation (BSS) is a powerful tool for analyzing composite data patterns in many areas, such as computational biology. We introduce a novel BSS method, Convex Analysis of Mixtures (CAM), for separating non-negative well-grounded sources, which learns the mixing matrix by identifying the lateral edges of the convex data scatter plot. We propose and prove a sufficient and necessary condition for identifying the mixing matrix through edge detection in the noise-free case, which enables CAM to identify the mixing matrix not only in the exact-determined and over-determined scenarios, but also in the under-determined scenario...
December 6, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27922119/in-situ-particles-reorientation-during-magnetic-hyperthermia-application-shape-matters-twice
#3
Konstantinos Simeonidis, M Puerto Morales, Marzia Marciello, Makis Angelakeris, Patricia de la Presa, Ana Lazaro-Carrillo, Andrea Tabero, Angeles Villanueva, Oksana Chubykalo-Fesenko, David Serantes
Promising advances in nanomedicine such as magnetic hyperthermia rely on a precise control of the nanoparticle performance in the cellular environment. This constitutes a huge research challenge due to difficulties for achieving a remote control within the human body. Here we report on the significant double role of the shape of ellipsoidal magnetic nanoparticles (nanorods) subjected to an external AC magnetic field: first, the heat release is increased due to the additional shape anisotropy; second, the rods dynamically reorientate in the orthogonal direction to the AC field direction...
December 6, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27922114/quantum-hall-effect-in-epitaxial-graphene-with-permanent-magnets
#4
F D Parmentier, T Cazimajou, Y Sekine, H Hibino, H Irie, D C Glattli, N Kumada, P Roulleau
We have observed the well-kown quantum Hall effect (QHE) in epitaxial graphene grown on silicon carbide (SiC) by using, for the first time, only commercial NdFeB permanent magnets at low temperature. The relatively large and homogeneous magnetic field generated by the magnets, together with the high quality of the epitaxial graphene films, enables the formation of well-developed quantum Hall states at Landau level filling factors v = ±2, commonly observed with superconducting electro-magnets. Furthermore, the chirality of the QHE edge channels can be changed by a top gate...
December 6, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27922106/in-situ-one-step-synthesis-of-carbon-encapsulated-naked-magnetic-metal-nanoparticles-conducted-without-additional-reductants-and-agents
#5
Jun Kang, Yeonwon Kim, Hye-Min Kim, Xiulan Hu, Nagahiro Saito, Jae-Hyuk Choi, Myeong-Hoon Lee
C-encapsulated highly pure Ni, Co, and Fe magnetic nanoparticles (MNPs/C) were synthesized by an innovative one-step in-situ plasma in liquid method (solution plasma processing, SPP) without any additional reductants, agents, or treatment. Successful encapsulation of MNPs was demonstrated by using inductively coupled plasma-atomic emission spectrometry and cyclic voltammetry techniques. The obtained X-ray diffraction patterns and transmission electron microscopy images corresponded to MNPs with average diameters of 5 nm and good crystalline structure...
December 6, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27922060/magnetic-properties-improvement-of-die-upset-nd-fe-b-magnets-by-dy-cu-press-injection-and-subsequent-heat-treatment
#6
Zexuan Wang, Jinyun Ju, Jinzhi Wang, Wenzong Yin, Renjie Chen, Ming Li, Chaoxiang Jin, Xu Tang, Don Lee, Aru Yan
Ultrafine-grained die-upset Nd-Fe-B magnets are of importance because they provide a wide researching space to redesign the textured structures. Here is presented a route to obtain a new die-upset magnet with substantially improved magnetic properties. After experiencing the optimized heat treatment, both the coercivity and remanent magnetization of the Dy-Cu press injected magnets increased substantially in comparison with those of the annealed reference magnets, which is distinct from the reported experimental results on heavy rare-earth diffusion...
December 6, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27921519/different-responses-of-drosophila-subobscura-isofemale-lines-to-extremely-low-frequency-magnetic-field-50%C3%A2-hz-0-5%C3%A2-mt-fitness-components-and-locomotor-activity
#7
Danica Zmejkoski, Branka Petković, Sofija Pavković-Lučić, Zlatko Prolić, Marko Anđelković, Tatjana Savić
PURPOSE: Extremely low frequency (ELF) magnetic fields as essential ecological factor may induce specific responses in genetically different lines. The subject of this study was to investigate the impact of ELF magnetic field on fitness components and locomotor activity of five Drosophila subobscura isofemale (IF) lines. MATERIALS AND METHODS: Each D. subobscura IF line, arbitrarily named: B16/1, B24/4, B39/1, B57/2 and B69/5, was maintained in five full-sib inbreeding generations...
December 6, 2016: International Journal of Radiation Biology
https://www.readbyqxmd.com/read/27921340/brain-activation-during-fear-extinction-predicts-exposure-success
#8
Tali Manber Ball, Sarah E Knapp, Martin P Paulus, Murray B Stein
BACKGROUND: Exposure therapy, a gold-standard treatment for anxiety disorders, is assumed to work via extinction learning, but this has never been tested. Anxious individuals demonstrate extinction learning deficits, likely related to less ventromedial prefrontal cortex (vmPFC) and more amygdala activation, but the relationship between these deficits and exposure outcome is unknown. We tested whether anxious individuals who demonstrate better extinction learning report greater anxiety reduction following brief exposure...
December 6, 2016: Depression and Anxiety
https://www.readbyqxmd.com/read/27921336/magnetic-anisotropy-in-pentacoordinate-ni-ii-and-co-ii-complexes-unraveling-electronic-and-geometrical-contributions
#9
Talal Mallah, Benjamin Cahier, Mauro Perfetti, Georges Zakhia, Daoud Naoufal, Fatima El-Khatib, Régis Guillot, Eric Rivière, Roberta Sessoli, Anne-Laure Barra, Nathalie Guihéry
The magnetic properties of the pentacoordinated [MII(Me4cyclam)N3]+ (Me4cyclam = tetramethylcyclam; N3 = azido and M = Ni and Co) complexes were investigated. Magnetization and EPR studies indicate that they possess an easy plane of magnetization with the axial anisotropy parameters D being close to 22 and larger than 30 cm-1 for the Ni and Co derivative, respectively. Ab initio calculations reproduce the experimental values of the zero field splitting parameters and allow determining the orientation of the anisotropy tensor axes with respect to the molecular frame...
December 6, 2016: Chemistry: a European Journal
https://www.readbyqxmd.com/read/27921330/the-new-face-of-isotopic-nmr-at-natural-abundance
#10
Tangi Jézéquel, Valentin Joubert, Patrick Giraudeau, Gérald S Remaud, Serge Akoka
The most widely used method for isotope analysis at natural abundance is isotope ratio monitoring by Mass Spectrometry (irm-MS) which provides bulk isotopic composition in (2) H, (13) C, (15) N, (18) O or (34) S. However, in the 1980s, the direct access to Site-specific Natural Isotope Fractionation by Nuclear Magnetic Resonance (SNIF-NMR(TM) ) was immediately recognized as a powerful technique to authenticate the origin of natural or synthetic products. The initial - and still most popular - application consisted in detecting the chaptalization of wines by irm-(2) H NMR...
November 7, 2016: Magnetic Resonance in Chemistry: MRC
https://www.readbyqxmd.com/read/27921204/a-case-of-double-depressor-palsy-followed-by-pursuit-deficit-due-to-sequential-infarction-in-bilateral-thalamus-and-right-medial-superior-temporal-area
#11
Su Jin Kim, Myeong In Yeom, Seung Uk Lee
BACKGROUND: We present a unique case of a patient who suffered two rare events affecting the supranuclear control, first of the vertical and second of the horizontal eye movements. The first event involved bilateral thalamic infarcts that resulted in double depressor palsy. The second event occurred 1 year later and it involved supranuclear control of horizontal eye movements creating pursuit deficit. CASE PRESENTATION: A 47-year-old male presented with complaints of diplopia upon awakening...
December 5, 2016: International Ophthalmology
https://www.readbyqxmd.com/read/27921171/computed-tomography-and-magnetic-resonance-fusion-imaging-in-cholesteatoma-preoperative-assessment
#12
Agustín Campos, Federico Mata, Rosa Reboll, María Luisa Peris, Jorge Basterra
The purpose of this study is to describe a method for developing fusion imaging for the preoperative evaluation of cholesteatoma. In 33 patients diagnosed with cholesteatoma, a high-resolution temporal bone computed tomography (CT) scan without intravenous contrast and propeller diffusion-weighted magnetic resonance imaging (MRI) were performed. Both studies were then sent to the BrainLAB work station, where the images were fused to obtain a morphological and color map. Intraoperative findings coincided with fusion CT-MRI imaging in all but two patients...
December 5, 2016: European Archives of Oto-rhino-laryngology
https://www.readbyqxmd.com/read/27921160/european-society-of-urogenital-radiology-esur-guidelines-mr-imaging-of-pelvic-endometriosis
#13
M Bazot, N Bharwani, C Huchon, K Kinkel, T M Cunha, A Guerra, L Manganaro, L Buñesch, A Kido, K Togashi, I Thomassin-Naggara, A G Rockall
: Endometriosis is a common gynaecological condition of unknown aetiology that primarily affects women of reproductive age. The accepted first-line imaging modality is pelvic ultrasound. However, magnetic resonance imaging (MRI) is increasingly performed as an additional investigation in complex cases and for surgical planning. There is currently no international consensus regarding patient preparation, MRI protocols or reporting criteria. Our aim was to develop clinical guidelines for MRI evaluation of pelvic endometriosis based on literature evidence and consensus expert opinion...
December 5, 2016: European Radiology
https://www.readbyqxmd.com/read/27921159/differentiation-of-uterine-leiomyosarcoma-from-atypical-leiomyoma-diagnostic-accuracy-of-qualitative-mr-imaging-features-and-feasibility-of-texture-analysis
#14
Yulia Lakhman, Harini Veeraraghavan, Joshua Chaim, Diana Feier, Debra A Goldman, Chaya S Moskowitz, Stephanie Nougaret, Ramon E Sosa, Hebert Alberto Vargas, Robert A Soslow, Nadeem R Abu-Rustum, Hedvig Hricak, Evis Sala
PURPOSE: To investigate whether qualitative magnetic resonance (MR) features can distinguish leiomyosarcoma (LMS) from atypical leiomyoma (ALM) and assess the feasibility of texture analysis (TA). METHODS: This retrospective study included 41 women (ALM = 22, LMS = 19) imaged with MRI prior to surgery. Two readers (R1, R2) evaluated each lesion for qualitative MR features. Associations between MR features and LMS were evaluated with Fisher's exact test. Accuracy measures were calculated for the four most significant features...
December 5, 2016: European Radiology
https://www.readbyqxmd.com/read/27921157/assessment-of-pisotriquetral-misalignment-with-magnetic-resonance-imaging-is-it-associated-with-trauma
#15
Hee-Dong Chae, Hye Jin Yoo, Sung Hwan Hong, Ja-Young Choi, Heung Sik Kang
OBJECTIVE: Our objective was to determine whether there is an association between pisotriquetral (PT) malalignment and acute distal radius fracture by using magnetic resonance imaging (MRI). METHODS: We evaluated 138 patients who underwent 3-T MRI of the wrists. Group A comprised 85 patients with acute distal radius fracture, and group B comprised 53 patients without trauma. PT interval and angle and pisiform excursion were measured on oblique axial and sagittal multiplanar reformats...
December 5, 2016: European Radiology
https://www.readbyqxmd.com/read/27921114/-postoperative-imaging-of-the-internal-auditory-canal-visualization-of-active-auditory-implants-german-version
#16
I Todt, G Rademacher, P Mittmann, S Mutze, A Ernst
BACKGROUND: Assessment of the internal auditory canal (IAC) and the cochlea is of central importance in neurotology. The artefacts and visibility of the different types of active auditory implants in MRI vary, due to their specific ferromagnetic components. Knowledge of the size of MRI artefacts and the options for handling these is important for the auditory rehabilitation of specific diseases (e. g., vestibular schwannoma). METHODS: The current paper is a literature review RESULTS: MRI assessment of the IAC and cochlea after surgical placement of an active auditory implant is feasible only with a percutaneous bone-anchored hearing aid (BAHA, Ponto)...
December 5, 2016: HNO
https://www.readbyqxmd.com/read/27921111/rapid-detection-of-hendra-virus-antibodies-an-integrated-device-with-nanoparticle-assay-and-chaotic-micromixing
#17
K Petkovic, G Metcalfe, H Chen, Y Gao, M Best, D Lester, Y Zhu
Current diagnosis of infectious diseases such as Hendra virus (HeV) relies mostly on laboratory-based tests. There is an urgent demand for rapid diagnosis technology to detect and identify these diseases in humans and animals so that disease spread can be controlled. In this study, an integrated lab-on-a-chip device using a magnetic nanoparticle immunoassay is developed. The key features of the device are the chaotic fluid mixing, achieved by magnetically driven motion of nanoparticles with the optimal mixing protocol developed using chaotic transport theory, and the automatic liquid handling system for loading reagents and samples...
December 6, 2016: Lab on a Chip
https://www.readbyqxmd.com/read/27921053/metastatic-esophageal-cancer-presenting-as-an-orbital-mass
#18
Sunil Pokharel, Ghassan Kabbach, Seth J Richter, Laura Chiu
We report a case of adenocarcinoma of the esophagus presenting as an orbital metastasis prior to the primary diagnosis. A 66-year-old white male presented to his ophthalmologist with right orbital swelling for several months. Magnetic resonance imaging revealed a supraorbital infiltrative mass. Pathology from the mass revealed findings consistent with adenocarcinoma of gastrointestinal origin. Upper endoscopy revealed distal esophageal stricture and irregularities. Pathology from the esophagus showed the same malignancy found in the orbit...
August 2016: ACG Case Reports Journal
https://www.readbyqxmd.com/read/27920977/neurochemical-changes-in-patients-with-chronic-low-back-pain-detected-by-proton-magnetic-resonance-spectroscopy-a-systematic-review
#19
REVIEW
Xianjing Zhao, Maosheng Xu, Kristen Jorgenson, Jian Kong
BACKGROUND: Low back pain is a highly prevalent health problem around the world, affecting 50% to 85% of people at some point in life. The purpose of this systematic review is to summarize the previous proton magnetic resonance spectroscopy studies on brain chemical changes in patients with chronic low back pain (CLBP). METHODS: We identified relevant studies from a literature search of PubMed and EMBASE from 1980 to March 2016. Data extraction was performed on the subjects' characteristics, MRS methods, spectral analyses, cerebral metabolites and perceptual measurements...
2017: NeuroImage: Clinical
https://www.readbyqxmd.com/read/27920976/resting-state-theta-band-connectivity-and-graph-analysis-in-generalized-social-anxiety-disorder
#20
Mengqi Xing, Reza Tadayonnejad, Annmarie MacNamara, Olusola Ajilore, Julia DiGangi, K Luan Phan, Alex Leow, Heide Klumpp
BACKGROUND: Functional magnetic resonance imaging (fMRI) resting-state studies show generalized social anxiety disorder (gSAD) is associated with disturbances in networks involved in emotion regulation, emotion processing, and perceptual functions, suggesting a network framework is integral to elucidating the pathophysiology of gSAD. However, fMRI does not measure the fast dynamic interconnections of functional networks. Therefore, we examined whole-brain functional connectomics with electroencephalogram (EEG) during resting-state...
2017: NeuroImage: Clinical
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