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https://www.readbyqxmd.com/read/27923226/intraoperative-tumoral-bleeding-of-hypervascular-medulloblastoma-after-ventricular-drainage-a-case-report
#1
Han-Seung Ryu, Tae-Young Jung, Moon-Soo Han, Seul-Ki Kim, Kyung-Hwa Lee
We report a rare case of intraoperative tumoral bleeding of a hypervascular medulloblastoma. A 12-year-old girl presented with dizziness and nausea. Brain magnetic resonance (MR) images revealed an approximately 4.2-cm enhanced mass on the cerebellar vermis associated with mild perilesional edema and increased cerebral blood volume. Angiography showed tumoral staining and developed occipital and circular dural sinuses in the venous phase. A suboccipital craniotomy was performed. To relieve the intracranial pressure, cerebrospinal fluid (CSF) was drained via a lateral ventricular catheter in the occipital horn...
December 7, 2016: Pediatric Neurosurgery
https://www.readbyqxmd.com/read/27923192/regional-homogeneity-associated-with-overgeneral-autobiographical-memory-of-first-episode-treatment-naive-patients-with-major-depressive-disorder-in-the-orbitofrontal-cortex-a-resting-state-fmri-study
#2
Yansong Liu, Xudong Zhao, Zaohuo Cheng, Fuquan Zhang, Jun Chang, Haosen Wang, Rukui Xie, Zhiqiang Wang, Leiming Cao, Guoqiang Wang
BACKGROUND: Overgeneral autobiographical memory (OGM) is involved in the onset and maintenance of depression. Recent studies have shown correlations between OGM and alterations of some brain regions by using task-state functional magnetic resonance imaging (fMRI). However, the correlation between OGM and spontaneous brain activity in depression remains unclear. The purpose of this study was to determine whether patients with major depressive disorder (MDD) show abnormal regional homogeneity (ReHo) and, if so, whether the brain areas with abnormal ReHo are associated with OGM...
November 30, 2016: Journal of Affective Disorders
https://www.readbyqxmd.com/read/27923189/sensitive-immunoassay-based-detection-of-vibrio-parahaemolyticus-using-capture-and-labeling-particles-in-a-stationary-liquid-phase-lab-on-a-chip
#3
Byunghee Park, Suk-Jung Choi
In the present study, a method was developed for detection of Vibrio parahaemolyticus based on a stationary liquid phase lab-on-a-chip (SLP LOC). The present SLP LOC comprises a sample chamber, washing chamber, and detection chamber connected by two channels. The method utilizes two types of particles: capture particles (CPs), which are magnetic nanoparticles functionalized with antibody; and labeling particles (LPs), which are silica nanoparticles functionalized with horseradish peroxidase and antibody. Samples were added to the sample chamber with CPs and LPs, forming a CP-bacteria-LP complex, and the complex was transported to the detection chamber containing chromogenic substrate solution...
December 1, 2016: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/27923103/noninvasive-microsurgery-using-aptamer-functionalized-magnetic-microdisks-for-tumor-cell-eradication
#4
Tatiana N Zamay, Galina S Zamay, Irina V Belyanina, Sergey S Zamay, Valery V Denisenko, Olga S Kolovskaya, Tatiana I Ivanchenko, Valentina L Grigorieva, Irina V Garanzha, Dmitry V Veprintsev, Yury E Glazyrin, Alexandr V Shabanov, Viktor Y Prinz, Vladimir A Seleznev, Alexey E Sokolov, Vladimir S Prokopenko, Petr D Kim, Ana Gargaun, Maxim V Berezovski, Anna S Zamay
Magnetomechanical cell disruption using nano- and microsized structures is a promising biomedical technology used for noninvasive elimination of diseased cells. It applies alternating magnetic field (AMF) for ferromagnetic microdisks making them oscillate and causing cell membrane disruption with cell death followed by apoptosis. In this study, we functionalized the magnetic microdisks with cell-binding DNA aptamers and guided the microdisks to recognize cancerous cells in a mouse tumor in vivo. Only 10 min of the treatment with a 100 Hz AMF was enough to eliminate cancer cells from a malignant tumor...
December 6, 2016: Nucleic Acid Therapeutics
https://www.readbyqxmd.com/read/27923087/magnetic-resonance-imaging-exposure-during-pregnancy-reply
#5
Joel G Ray, Aditya Bharatha, Walter J Montanera
No abstract text is available yet for this article.
December 6, 2016: JAMA: the Journal of the American Medical Association
https://www.readbyqxmd.com/read/27923085/magnetic-resonance-imaging-exposure-during-pregnancy
#6
LETTER
Sean P Symons, Chris Heyn, Pejman Jabehdar Maralani
No abstract text is available yet for this article.
December 6, 2016: JAMA: the Journal of the American Medical Association
https://www.readbyqxmd.com/read/27922962/retention-and-mechanical-behavior-of-attachment-systems-for-implant-retained-auricular-prostheses
#7
Eder Alberto Sigua-Rodriguez, Douglas Rangel Goulart, Zarina Tatia Santos, Natalia Alvarez-Pinzon, Sergio Olate, José Ricardo de Albergaria-Barbosa
OBJECTIVE: Auricular prostheses are artificial substitutes for facial defects. The retention of these has often been a problem. This study aimed to evaluate the mechanical behavior of 3 retained auricular prosthetic connections when submitted to a mechanical cycling test. MATERIALS AND METHODS: Twelve samples with installed implants were obtained and divided into 3 groups according to their retention system with 4 samples in each group. I: bar-clip system; II: magnet system; and III: ball/o-ring system...
December 5, 2016: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/27922640/brain-network-reorganization-differs-in-response-to-stress-in-rats-genetically-predisposed-to-depression-and-stress-resilient-rats
#8
N Gass, R Becker, A J Schwarz, W Weber-Fahr, C Clemm von Hohenberg, B Vollmayr, A Sartorius
Treatment-resistant depression (TRD) remains a pressing clinical problem. Optimizing treatment requires better definition of the specificity of the involved brain circuits. The rat strain bred for negative cognitive state (NC) represents a genetic animal model of TRD with high face, construct and predictive validity. Vice versa, the positive cognitive state (PC) strain represents a stress-resilient phenotype. Although NC rats show depressive-like behavior, some symptoms such as anhedonia require an external trigger, i...
December 6, 2016: Translational Psychiatry
https://www.readbyqxmd.com/read/27922605/pattern-of-structural-brain-changes-in-social-anxiety-disorder-after-cognitive-behavioral-group-therapy-a-longitudinal-multimodal-mri-study
#9
V R Steiger, A B Brühl, S Weidt, A Delsignore, M Rufer, L Jäncke, U Herwig, J Hänggi
Social anxiety disorder (SAD) is characterized by fears of social and performance situations. Cognitive behavioral group therapy (CBGT) has in general positive effects on symptoms, distress and avoidance in SAD. Prior studies found increased cortical volumes and decreased fractional anisotropy (FA) in SAD compared with healthy controls (HCs). Thirty-three participants diagnosed with SAD attended in a 10-week CBGT and were scanned before and after therapy. We applied three neuroimaging methods-surface-based morphometry, diffusion tensor imaging and network-based statistics-each with specific longitudinal processing protocols, to investigate CBGT-induced structural brain alterations of the gray and white matter (WM)...
December 6, 2016: Molecular Psychiatry
https://www.readbyqxmd.com/read/27922231/evaluation-of-central-nervous-system-in-patients-with-glycogen-storage-disease-type-1a
#10
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
#11
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
#12
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
#13
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
#14
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
#15
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
#16
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
#17
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
#18
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
#19
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
#20
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
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