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https://www.readbyqxmd.com/read/28750494/brain-pet-and-functional-mri-why-simultaneously-using-hybrid-pet-mr-systems
#1
Diego Cecchin, Alessandro Palombit, Marco Castellaro, Erica Silvestri, Franco Bui, Henryk Barthel, Osama Sabri, Maurizio Corbetta, Alessandra Bertoldo
INTRODUCTION: In the last 20 years growing attention has been devoted to multimodal imaging. The recent literature is rich of clinical and research studies that have been performed using different imaging modalities on both separate and integrated Positron Emission Tomography (PET) and Magnetic Resonance (MR) scanners. However, today, hybrid PET/MR systems measure signals related to brain structure, metabolism, neurochemistry, perfusion, and neuronal activity simultaneously, i.e. in the same physiological conditions...
July 27, 2017: Quarterly Journal of Nuclear Medicine and Molecular Imaging
https://www.readbyqxmd.com/read/28749937/recurrently-connected-and-localized-neuronal-communities-initiate-coordinated-spontaneous-activity-in-neuronal-networks
#2
Davide Lonardoni, Hayder Amin, Stefano Di Marco, Alessandro Maccione, Luca Berdondini, Thierry Nieus
Developing neuronal systems intrinsically generate coordinated spontaneous activity that propagates by involving a large number of synchronously firing neurons. In vivo, waves of spikes transiently characterize the activity of developing brain circuits and are fundamental for activity-dependent circuit formation. In vitro, coordinated spontaneous spiking activity, or network bursts (NBs), interleaved within periods of asynchronous spikes emerge during the development of 2D and 3D neuronal cultures. Several studies have investigated this type of activity and its dynamics, but how a neuronal system generates these coordinated events remains unclear...
July 27, 2017: PLoS Computational Biology
https://www.readbyqxmd.com/read/28749455/primary-biliary-cholangitis-alters-functional-connections-of-the-brain-s-deep-gray-matter
#3
Victoria A L Mosher, Mark G Swain, Jack X Q Pang, Gilaad G Kaplan, Keith A Sharkey, Glenda M MacQueen, Bradley G Goodyear
OBJECTIVES: Fatigue, itch, depressed mood, and cognitive impairment significantly impact the quality of life of many patients with primary biliary cholangitis (PBC). Previous neuroimaging studies of non-hepatic diseases suggest that these symptoms are often associated with dysfunction of deep gray matter brain regions. We used resting-state functional magnetic resonance imaging (rsfMRI) to determine whether PBC patients exhibit altered functional connections of deep gray matter. METHODS: Twenty female non-cirrhotic PBC patients and 21 age/gender-matched controls underwent rsfMRI...
July 27, 2017: Clinical and Translational Gastroenterology
https://www.readbyqxmd.com/read/28748537/differences-in-brain-morphology-and-working-memory-capacity-across-childhood
#4
Joe Bathelt, Susan E Gathercole, Amy Johnson, Duncan E Astle
Working memory (WM) skills are closely associated with learning progress in key areas such as reading and mathematics across childhood. As yet, however, little is known about how the brain systems underpinning WM develop over this critical developmental period. The current study investigated whether and how structural brain correlates of components of the working memory system change over development. Verbal and visuospatial short-term and working memory were assessed in 153 children between 5.58 and 15.92 years, and latent components of the working memory system were derived...
July 26, 2017: Developmental Science
https://www.readbyqxmd.com/read/28748382/hydrogen-rich-saline-prevents-bone-loss-in-diabetic-rats-induced-by-streptozotocin
#5
Jialiang Guo, Weichong Dong, Lin Jin, Pengcheng Wang, Zhiyong Hou, Yingze Zhang
PURPOSE: As an antioxidant molecule, hydrogen has been received much more attention and reported to be used as the treatment strategy for various diseases. In this study, we hypothesize that systemic delivery of hydrogen saline water may improve the reservation of bone tissue in the tibias and femurs of osteoporotic rats caused by diabetes mellitus (DM), which is characterized by increased levels of oxidative stress and overproducing reactive oxygen species (ROS). METHODS: The animals were divided into three groups of 12 animals and lavaged with normal saline (normal control and DM), or hydrogen saline water (DM + HRS)...
July 26, 2017: International Orthopaedics
https://www.readbyqxmd.com/read/28748319/diverse-action-of-repeated-corticosterone-treatment-on-synaptic-transmission-neuronal-plasticity-and-morphology-in-superficial-and-deep-layers-of-the-rat-motor-cortex
#6
Joanna Kula, Anna Gugula, Anna Blasiak, Bartosz Bobula, Joanna Danielewicz, Alan Kania, Grzegorz Tylko, Grzegorz Hess
One of the adverse effects of prolonged stress in rats is impaired performance of skilled reaching and walking tasks. The mechanisms that lead to these abnormalities are incompletely understood. Therefore, we compared the effects of twice daily repeated corticosterone injections for 7 days on miniature excitatory postsynaptic currents (mEPSCs), as well as on synaptic plasticity and morphology of layers II/III and V pyramidal neurons of the primary motor cortex (M1) of male Wistar rats. Corticosterone treatment resulted in increased frequency, but not amplitude, of mEPSCs in layer II/III neurons accompanied by increased complexity of the apical part of their dendritic tree, with no changes in the density of dendritic spines...
July 27, 2017: Pflügers Archiv: European Journal of Physiology
https://www.readbyqxmd.com/read/28747892/how-useful-is-electroencephalography-in-the-diagnosis-of-autism-spectrum-disorders-and-the-delineation-of-subtypes-a-systematic-review
#7
REVIEW
Oana Gurau, William J Bosl, Charles R Newton
Autism spectrum disorders (ASD) are thought to be associated with abnormal neural connectivity. Presently, neural connectivity is a theoretical construct that cannot be easily measured. Research in network science and time series analysis suggests that neural network structure, a marker of neural activity, can be measured with electroencephalography (EEG). EEG can be quantified by different methods of analysis to potentially detect brain abnormalities. The aim of this review is to examine evidence for the utility of three methods of EEG signal analysis in the ASD diagnosis and subtype delineation...
2017: Frontiers in Psychiatry
https://www.readbyqxmd.com/read/28747880/strong-functional-connectivity-among-homotopic-brain-areas-is-vital-for-motor-control-in-unilateral-limb-movement
#8
Pengxu Wei, Zuting Zhang, Zeping Lv, Bin Jing
The mechanism underlying brain region organization for motor control in humans remains poorly understood. In this functional magnetic resonance imaging (fMRI) study, right-handed volunteers were tasked to maintain unilateral foot movements on the right and left sides as consistently as possible. We aimed to identify the similarities and differences between brain motor networks of the two conditions. We recruited 18 right-handed healthy volunteers aged 25 ± 2.3 years and used a whole-body 3T system for magnetic resonance (MR) scanning...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28747760/early-functional-network-alterations-in-asymptomatic-elders-at-risk-for-alzheimer-s-disease
#9
Akinori Nakamura, Pablo Cuesta, Takashi Kato, Yutaka Arahata, Kaori Iwata, Misako Yamagishi, Izumi Kuratsubo, Kimiko Kato, Masahiko Bundo, Kersten Diers, Alberto Fernández, Fernando Maestú, Kengo Ito
Amyloid-β (Aβ) deposition is known to starts decades before the onset of clinical symptoms of Alzheimer's disease (AD), however, the detailed pathophysiological processes underlying this preclinical period are not well understood. This study aimed to investigate functional network alterations in cognitively intact elderly individuals at risk for AD, and assessed the association between these network alterations and changes in Aβ deposition, glucose metabolism, and brain structure. Forty-five cognitively normal elderly subjects, who were classified into Aβ-positive (CN+) and Aβ-negative (CN-) groups using (11)C-Pittsburgh compound B PET, underwent resting state magnetoencephalography measurements, (18)F-fluorodeoxyglucose PET (FDG-PET) and structural MRI...
July 26, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28747717/contextual-connectivity-a-framework-for-understanding-the-intrinsic-dynamic-architecture-of-large-scale-functional-brain-networks
#10
Rastko Ciric, Jason S Nomi, Lucina Q Uddin, Ajay B Satpute
Investigations of the human brain's connectomic architecture have produced two alternative models: one describes the brain's spatial structure in terms of static localized networks, and the other describes the brain's temporal structure in terms of dynamic whole-brain states. Here, we used tools from connectivity dynamics to develop a synthesis that bridges these models. Using resting fMRI data, we investigated the assumptions undergirding current models of the human connectome. Consistent with state-based models, our results suggest that static localized networks are superordinate approximations of underlying dynamic states...
July 26, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28747662/inference-of-neuronal-functional-circuitry-with-spike-triggered-non-negative-matrix-factorization
#11
Jian K Liu, Helene M Schreyer, Arno Onken, Fernando Rozenblit, Mohammad H Khani, Vidhyasankar Krishnamoorthy, Stefano Panzeri, Tim Gollisch
Neurons in sensory systems often pool inputs over arrays of presynaptic cells, giving rise to functional subunits inside a neuron's receptive field. The organization of these subunits provides a signature of the neuron's presynaptic functional connectivity and determines how the neuron integrates sensory stimuli. Here we introduce the method of spike-triggered non-negative matrix factorization for detecting the layout of subunits within a neuron's receptive field. The method only requires the neuron's spiking responses under finely structured sensory stimulation and is therefore applicable to large populations of simultaneously recorded neurons...
July 26, 2017: Nature Communications
https://www.readbyqxmd.com/read/28747498/pseudorabies-virus-us3-induced-tunneling-nanotubes-contain-stabilized-microtubules-interact-with-neighbouring-cells-via-cadherins-and-allow-intercellular-molecular-communication
#12
Robert J J Jansens, Wim Van den Broeck, Steffi De Pelsmaeker, Jochen A S Lamote, Cliff Van Waesberghe, Liesbeth Couck, Herman W Favoreel
Tunneling nanotubes (TNTs) are long bridge-like structures that connect eukaryotic cells and mediate intercellular communication. We found earlier that the conserved alphaherpesvirus US3 protein kinase induces long cell projections that contact distant cells and promote intercellular virus spread. In this report, we show that the US3-induced cell projections constitute TNTs. In addition, we report that US3-induced TNTs mediate intercellular transport of information (i.e. GFP) in the absence of other viral proteins...
July 26, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28747437/crystal-structure-of-the-human-pol%C3%AF%C2%B5-b-subunit-in-complex-with-the-c-terminal-domain-of-the-catalytic-subunit
#13
Andrey G Baranovskiy, Jianyou Gu, Nigar D Babayeva, Igor Kurinov, Youri I Pavlov, Tahir H Tahirov
The eukaryotic B-family DNA polymerases include four members, Polα, Polδ, Polϵ, and Polζ, which share common architectural features, such as the exonuclease/polymerase and C-terminal domains (CTDs) of catalytic subunits bound to indispensable B-subunits, which serve as scaffolds that mediate interactions with other components of the replication machinery. Crystal structures for the B-subunits of Polα and Polδ/Polζ have been reported; the former within the primosome and separately with CTD, and the latter with the N-terminal domain (NTD) of the C-subunit...
July 26, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28746974/mrnps-meet-stress-granules
#14
REVIEW
Jonathan Sheinberger, Yaron Shav-Tal
Stress granules are cytoplasmic structures that form in response to a variety of cellular stresses. They contain mRNAs and many proteins including numerous types of RNA-binding proteins, and have been studied in connection to major cellular events such as protein synthesis as well as disease. Despite the well-known fact that stress granules encapsulate mRNPs (mRNA-protein complexes), much of the research has naturally focused on the protein components of stress granules. The specific details of mRNP entry into and exit from stress granules and the functional reasons for these dynamics are not fully understood...
July 26, 2017: FEBS Letters
https://www.readbyqxmd.com/read/28746815/higher-order-areas-of-the-mouse-visual-cortex
#15
Lindsey L Glickfeld, Shawn R Olsen
The brain has evolved to transform sensory information in the environment into neural representations that can be used for perception and action. Higher-order sensory cortical areas, with their increasingly complex receptive fields and integrative properties, are thought to be critical nodes for this function. This is especially true in the primate visual cortex, in which functionally specialized areas are engaged in parallel streams to support diverse computations. Recent anatomical and physiological studies of the mouse visual cortex have revealed a similarly complex network of specialized higher-order areas...
July 26, 2017: Annual Review of Vision Science
https://www.readbyqxmd.com/read/28746775/spatial-connectivity-in-an-adult-sedentary-reef-fish-with-extended-pelagic-larval-phase
#16
L Antoni, E Saillant
Understanding the spatial scale of demographic connectivity in marine reef fishes dispersing pelagic larvae is a challenging task because of the technical difficulties associated with tagging and monitoring the movements of progeny at early life stages. Several studies highlighted a strong importance of local retention with levels of dispersal of ecological significance restricted to short distances. To date little information is available in species where pelagic dispersal lasts for long periods of time. In this work population structure and connectivity were studied in the gray triggerfish, Balistes capriscus...
July 26, 2017: Molecular Ecology
https://www.readbyqxmd.com/read/28746272/extended-transconjunctival-lower-eyelid-blepharoplasty-with-release-of-the-tear-trough-ligament-and-fat-redistribution
#17
Chin-Ho Wong, Bryan Mendelson
BACKGROUND: The transconjunctival lower eyelid blepharoplasty is advantageous for its quick recovery and low complication rates. Conventional techniques rely on fat removal to contour the lower eyelid. This article describes the authors' extended transconjunctival lower eyelid blepharoplasty technique that takes dissection beyond the orbital rim to address aging changes on the midcheek. METHODS: From December of 2012 to December of 2015, 54 patients underwent this procedure...
August 2017: Plastic and Reconstructive Surgery
https://www.readbyqxmd.com/read/28746188/antenatal-diagnosis-and-prognostic-factors-of-aneurysmal-malformation-of-the-vein-of-galen-a-case-report-and-literature-review
#18
Doru Herghelegiu, Cringu A Ionescu, Irina Pacu, Roxana Bohiltea, Catalin Herghelegiu, Simona Vladareanu
RATIONALE: Vein of Galen aneurysmal malformation (VGAM) is a rare complex malformation of the cerebral vascular system consisting of arteriovenous shunts between the vein of Galen and the cerebral arteries. PATIENT CONCERNS: We present the case of a 31-year-old pregnant woman, para 1, gravida 1. DIAGNOSES: At 26 weeks' gestation who was examined for an anechoic mass on the cerebral median midline with color and pulsed Doppler. She presented with positive flow on the color and pulsed Doppler test, associated with hydrocephalus, cortical hypoplasia, cardiomegaly, jugular vein distension...
July 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28746137/the-impact-of-an-academy-of-medical-educators-on-the-culture-of-an-american-health-sciences-campus
#19
Janet Corral, Gretchen Guiton, Eva Aagaard
PURPOSE: During the last two decades in the United States, academies of medical educators (AMEs) have proliferated as formal organizations within faculties of health professions education to recognize teaching excellence, support faculty development, and encourage scholarly activity. AMEs have been effective at rewarding faculty for educational excellence and providing faculty development. However, the impact of an AME on campus culture remains unclear. METHOD: A qualitative case study asked, How has an AME shaped organizational culture? The authors investigated the University of Colorado health sciences campus AME given its clear mandate to impact organizational culture...
August 2017: Academic Medicine: Journal of the Association of American Medical Colleges
https://www.readbyqxmd.com/read/28745871/local-electric-field-facilitates-high-performance-li-ion-batteries
#20
Youwen Liu, Tengfei Zhou, Yang Zheng, Zhihai He, Chong Xiao, Wei Kong Pang, Wei Tong, Youming Zou, Bicai Pan, Zaiping Guo, Yi Xie
By scrutinizing the energy storage process in Li-ion batteries, tuning Li-ion migration behavior by atomic level tailoring will unlock great potential for pursuing higher electrochemical performance. Vacancy, which can effectively modulate the electrical ordering on the nanoscale, even in tiny concentrations, will provide tempting opportunities for manipulating Li-ion migratory behavior. Herein, taking CuGeO3 as a model, oxygen vacancies obtained by reducing the thickness dimension down to the atomic scale are introduced in this work...
July 26, 2017: ACS Nano
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