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https://www.readbyqxmd.com/read/29457183/diabatic-potential-energy-surfaces-of-mgh-2-and-dynamic-studies-for-the-mg-3p-h-2-%C3%A2-mgh-h-reaction
#1
Jiuchuang Yuan, Di He, Shufen Wang, Maodu Chen, Keli Han
The global diabatic potential energy surfaces (PESs) of the MgH2 + system, which can be used to study the dynamics of the Mg+ (3p2 P) + H2 (X1 Σ) → MgH+ (X1 Σ+ ) + H(2 S) reaction, are structured for the first time. The diabatic PESs are correlated with the ground state 12 A' and the first excited state 22 A'. The multi-reference configuration interaction method and the VQZ basis set are used in ab initio calculations, and diabatic potential energies are calculated based on the molecular properties of the dipole moment...
February 19, 2018: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29456495/structural-variation-of-chondroitin-sulfate-chains-contributes-to-the-molecular-heterogeneity-of-perineuronal-nets
#2
Shinji Miyata, Satomi Nadanaka, Michihiro Igarashi, Hiroshi Kitagawa
Aggrecan, a chondroitin sulfate (CS) proteoglycan, forms lattice-like extracellular matrix structures called perineuronal nets (PNNs). Neocortical PNNs primarily ensheath parvalbumin-expressing inhibitory neurons (parvalbumin, PV cells) late in brain development. Emerging evidence indicates that PNNs promote the maturation of PV cells by enhancing the incorporation of homeobox protein Otx2 and regulating experience-dependent neural plasticity. Wisteria floribunda agglutinin (WFA), an N-acetylgalactosamine-specific plant lectin, binds to the CS chains of aggrecan and has been widely used to visualize PNNs...
2018: Frontiers in Integrative Neuroscience
https://www.readbyqxmd.com/read/29456026/neural-population-dynamics-underlying-motor-learning-transfer
#3
Saurabh Vyas, Nir Even-Chen, Sergey D Stavisky, Stephen I Ryu, Paul Nuyujukian, Krishna V Shenoy
Covert motor learning can sometimes transfer to overt behavior. We investigated the neural mechanism underlying transfer by constructing a two-context paradigm. Subjects performed cursor movements either overtly using arm movements, or covertly via a brain-machine interface that moves the cursor based on motor cortical activity (in lieu of arm movement). These tasks helped evaluate whether and how cortical changes resulting from "covert rehearsal" affect overt performance. We found that covert learning indeed transfers to overt performance and is accompanied by systematic population-level changes in motor preparatory activity...
February 13, 2018: Neuron
https://www.readbyqxmd.com/read/29454932/preserved-canonicality-of-the-bold-hemodynamic-response-reflects-healthy-cognition-insights-into-the-healthy-brain-through-the-window-of-multiple-sclerosis
#4
REVIEW
Monroe P Turner, Nicholas A Hubbard, Dinesh K Sivakolundu, Lyndahl M Himes, Joanna L Hutchison, John Hart, Jeffrey Spence, Elliot Frohman, Teresa Frohman, Darin Okuda, Bart Rypma
The hemodynamic response function (HRF), a model of brain blood-flow changes in response to neural activity, reflects communication between neurons and the vasculature that supplies these neurons in part by means of glial cell intermediaries (e.g., astrocytes). Intact neural-vascular communication might play a central role in optimal cognitive performance. This hypothesis can be tested by comparing healthy individuals to those with known white-matter damage and impaired performance, as seen in Multiple Sclerosis (MS)...
February 15, 2018: NeuroImage
https://www.readbyqxmd.com/read/29454705/schwann-cell-precursor-a-neural-crest-cell-in-disguise
#5
REVIEW
Alessandro Furlan, Igor Adameyko
Schwann cell precursors (SCPs) are multipotent embryonic progenitors covering all developing peripheral nerves. These nerves grow and navigate with unprecedented precision, delivering SCP progenitors to almost all locations in the embryonic body. Within specific developing tissues, SCPs detach from nerves and generate neuroendocrine cells, autonomic neurons, mature Schwann cells, melanocytes and other cell types. These properties of SCPs evoke resemblances between them and their parental population, namely, neural crest cells...
February 15, 2018: Developmental Biology
https://www.readbyqxmd.com/read/29453976/cell-type-specific-expression-of-constitutively-active-rheb-promotes-regeneration-of-bulbospinal-respiratory-axons-following-cervical-sci
#6
Mark W Urban, Biswarup Ghosh, Laura R Strojny, Cole G Block, Sara M Blazejewski, Megan C Wright, George M Smith, Angelo C Lepore
Damage to respiratory neural circuitry and consequent loss of diaphragm function is a major cause of morbidity and mortality in individuals suffering from traumatic cervical spinal cord injury (SCI). Repair of CNS axons after SCI remains a therapeutic challenge, despite current efforts. SCI disrupts inspiratory signals originating in the rostral ventral respiratory group (rVRG) of the medulla from their phrenic motor neuron (PhMN) targets, resulting in loss of diaphragm function. Using a rat model of cervical hemisection SCI, we aimed to restore rVRG-PhMN-diaphragm circuitry by stimulating regeneration of injured rVRG axons via targeted induction of Rheb (ras homolog enriched in brain), a signaling molecule that regulates neuronal-intrinsic axon growth potential...
February 14, 2018: Experimental Neurology
https://www.readbyqxmd.com/read/29452809/test-of-neural-inertia-in-humans-during-general-anaesthesia
#7
M H Kuizenga, P J Colin, K M E M Reyntjens, D J Touw, H Nalbat, F H Knotnerus, H E M Vereecke, M M R F Struys
BACKGROUND: Neural inertia is defined as the tendency of the central nervous system to resist transitions between arousal states. This phenomenon has been observed in mice and Drosophila anaesthetized with volatile anaesthetics: the effect-site concentration required to induce anaesthesia in 50% of the population (C50 ) was significantly higher than the effect-site concentration for 50% of the population to recover from anaesthesia. We evaluated this phenomenon in humans using propofol or sevoflurane (both with or without remifentanil) as anaesthetic agents...
March 2018: British Journal of Anaesthesia
https://www.readbyqxmd.com/read/29451491/the-relationship-between-spatial-configuration-and-functional-connectivity-of-brain-regions
#8
Janine Diane Bijsterbosch, Mark W Woolrich, Matthew F Glasser, Emma C Robinson, Christian F Beckmann, David C Van Essen, Samuel J Harrison, Stephen M Smith
Brain connectivity is often considered in terms of the communication between functionally distinct brain regions. Many studies have investigated the extent to which patterns of coupling strength between multiple neural populations relates to behaviour. For example, studies have used 'functional connectivity fingerprints' to characterise individuals' brain activity. Here, we investigate the extent to which the exact spatial arrangement of cortical regions interacts with measures of brain connectivity. We find that the shape and exact location of brain regions interact strongly with the modelling of brain connectivity, and present evidence that the spatial arrangement of functional regions is strongly predictive of non-imaging measures of behaviour and lifestyle...
February 16, 2018: ELife
https://www.readbyqxmd.com/read/29450935/community-violence-exposure-correlates-with-smaller-gray-matter-volume-and-lower-iq-in-urban-adolescents
#9
Oisin Butler, Xiao-Fei Yang, Corinna Laube, Simone Kühn, Mary Helen Immordino-Yang
Adolescents' exposure to community violence is a significant public health issue in urban settings and has been associated with poorer cognitive performance and increased risk for psychiatric illnesses, including PTSD. However, no study to date has investigated the neural correlates of community violence exposure in adolescents. Sixty-five healthy adolescents (age = 14-18 years; 36 females, 29 males) from moderate- to high-crime neighborhoods in Los Angeles reported their violence exposure, parents' education level, and free/reduced school lunch status (socio-economic status, SES), and underwent structural neuroimaging and intelligence testing...
February 15, 2018: Human Brain Mapping
https://www.readbyqxmd.com/read/29450693/the-effect-of-assisted-reproductive-technology-on-the-incidence-of-birth-defects-among-livebirths
#10
Gil Shechter-Maor, Nicholas Czuzoj-Shulman, Andrea R Spence, Haim Arie Abenhaim
PURPOSE: Our study objective is to examine the association between births conceived with assisted reproductive technology (ART) and birth defects using a large database from the United States. METHODS: Using the Centers for Disease Control and Prevention's Period-linked birth-infant death data files and fetal death database for 2011-2013, we conducted a retrospective cohort study comprised of live births that occurred in the USA during that time. Multivariate logistic regression was used to estimate the association between ART and birth defects, both overall and by specific defects...
February 15, 2018: Archives of Gynecology and Obstetrics
https://www.readbyqxmd.com/read/29450539/retinothalamic-white-matter-abnormalities-in-amblyopia
#11
Brian Allen, Melanie A Schmitt, Burton J Kushner, Bas Rokers
Purpose: Amblyopia is associated with a broad array of perceptual and neural abnormalities in the visual system, particularly in untreated or unsuccessfully treated populations. Traditionally, it has been believed that the neural abnormalities are confined to the visual cortex and subcortex (e.g., lateral geniculate nucleus). Here, we investigate the presence of neuroanatomical abnormalities earlier in the visual stream, in the optic nerves and tracts, of participants with two predominant forms of amblyopia...
February 1, 2018: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/29450220/recent-insights-into-corticostriatal-circuit-mechanisms-underlying-habits-invited-review-for-current-opinions-in-behavioral-sciences
#12
Justin O'Hare, Nicole Calakos, Henry H Yin
Habits have been studied for decades, but it was not until recent years that experiments began to elucidate the underlying cellular and circuit mechanisms. The latest experiments have been enabled by advances in cell-type specific monitoring and manipulation of activity in large neuronal populations. Here we will review recent efforts to understand the neural substrates underlying habit formation, focusing on rodent studies on corticostriatal circuits.
April 2018: Current Opinion in Behavioral Sciences
https://www.readbyqxmd.com/read/29450103/public-health-failure-in-the-prevention-of-neural-tube-defects-time-to-abandon-the-tolerable-upper-intake-level-of-folate
#13
REVIEW
Nicholas J Wald, Joan K Morris, Colin Blakemore
The neural tube defects anencephaly and spina bifida are two of the most common serious congenital malformations. Most cases can be prevented by consuming sufficient folic acid immediately before pregnancy and in early pregnancy. Fortification of flour with folic acid to prevent these defects has been implemented in 81 countries without public objection or indication of harm. An obstacle to the wider adoption of fortification arises from the creation of a "tolerable upper intake level" for folate (which includes natural food folate as well as synthetic folic acid), and which has been set at 1 mg/day, thereby proscribing higher folate intakes...
2018: Public Health Reviews
https://www.readbyqxmd.com/read/29448445/collective-excitability-in-a-mesoscopic-neuronal-model-of-epileptic-activity
#14
Maciej Jedynak, Antonio J Pons, Jordi Garcia-Ojalvo
At the mesoscopic scale, the brain can be understood as a collection of interacting neuronal oscillators, but the extent to which its sustained activity is due to coupling among brain areas is still unclear. Here we address this issue in a simplified situation by examining the effect of coupling between two cortical columns described via Jansen-Rit neural mass models. Our results show that coupling between the two neuronal populations gives rise to stochastic initiations of sustained collective activity, which can be interpreted as epileptic events...
January 2018: Physical Review. E
https://www.readbyqxmd.com/read/29448133/exposure-to-the-rock-inhibitor-fasudil-promotes-gliogenesis-of-neural-stem-cells-in-vitro
#15
Zubair Ahmed Nizamudeen, Lisa Chakrabarti, Virginie Sottile
Fasudil is a clinically approved Rho-associated protein kinase (ROCK) inhibitor that has been used widely to treat cerebral consequences of subarachnoid hemorrhage. It is known to have a positive effect on animal models of neurological disorders including Parkinson's disease and stroke. However, its cellular effect on progenitor populations and differentiation is not clearly understood. While recent studies suggest that fasudil promotes the mobilization of neural stem cells (NSCs) from the subventricular zone in vivo and promotes the differentiation of the C17...
February 6, 2018: Stem Cell Research
https://www.readbyqxmd.com/read/29447951/suction-electrode-recording-in-locus-coeruleus-of-newborn-rat-brain-slices-reveals-network-bursting-comprising-summated-non-synchronous-spiking
#16
Vladimir Rancic, Bijal Rawal, Bogdan Panaitescu, Araya Ruangkittisakul, Klaus Ballanyi
The brainstem locus coeruleus (LC) controling behaviors like arousal, sleep, breathing, pain or opioid withdrawal is an established model for spontaneous action potential synchronization. Such synchronous 'spiking' might produce an extracellular field potential (FP) which is a crucial tool for neural network analyses. We found using ≥10 μm tip diameter suction electrodes in newborn rat brainstem slices that the LC generates at ∼1 Hz a robust rhythmic FP (rFP). During distinct rFP phases, LC neurons discharge with a jitter of ±33 ms single spikes that summate to a ∼200 ms-lasting population burst...
February 12, 2018: Neuroscience Letters
https://www.readbyqxmd.com/read/29447907/wilhelm-his-lasting-insights-into-hindbrain-and-cranial-ganglia-development-and-evolution
#17
REVIEW
Joel C Glover, Karen L Elliott, Albert Erives, Victor V Chizhikov, Bernd Fritzsch
Wilhelm His (1831-1904) provided lasting insights into the development of the central and peripheral nervous system using innovative technologies such as the microtome, which he invented. 150 years after his resurrection of the classical germ layer theory of Wolff, von Baer and Remak, his description of the developmental origin of cranial and spinal ganglia from a distinct cell population, now known as the neural crest, has stood the test of time and more recently sparked tremendous advances regarding the molecular development of these important cells...
February 12, 2018: Developmental Biology
https://www.readbyqxmd.com/read/29447165/comparison-of-three-data-mining-models-for-prediction-of-advanced-schistosomiasis-prognosis-in-the-hubei-province
#18
Guo Li, Xiaorong Zhou, Jianbing Liu, Yuanqi Chen, Hengtao Zhang, Yanyan Chen, Jianhua Liu, Hongbo Jiang, Junjing Yang, Shaofa Nie
BACKGROUND: In order to better assist medical professionals, this study aimed to develop and compare the performance of three models-a multivariate logistic regression (LR) model, an artificial neural network (ANN) model, and a decision tree (DT) model-to predict the prognosis of patients with advanced schistosomiasis residing in the Hubei province. METHODOLOGY/PRINCIPAL FINDINGS: Schistosomiasis surveillance data were collected from a previous study based on a Hubei population sample including 4136 advanced schistosomiasis cases...
February 15, 2018: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/29446469/clinical-trials-in-allergen-immunotherapy-current-concepts-and-future-needs
#19
REVIEW
O Pfaar, M Alvaro, V Cardona, E Hamelmann, R Mösges, J Kleine-Tebbe
Allergen immunotherapy (AIT) is a safe, effective treatment for allergic rhinoconjunctivitis and allergic asthma. However, AIT's clinical effect is still contested - primarily due to heterogeneity in clinical trial designs, study populations, therapeutic formulations and efficacy criteria. After discussing current concepts and unmet needs, an international panel of experts made several recommendations: (i) explore and validate definitions for [clinical] responders in AIT-trials; (ii) use of well-documented, standardized provocation tests prior to inclusion of subjects with relevant diseases in AIT trials; (iii) monitoring neo-sensitizations and occurrence of new allergy in extended AIT trials, and exclusion of polyallergic participants; (iv) validation of allergen exposure chambers with regard to natural exposure; (v) in studies of seasonal allergies, focus on peak exposure but also consider organising two parallel, geographically distinct but otherwise identical trials; (vi) discuss adaptive trial designs with the regulatory authorities; (vii) use e-health and m-health technologies to capture more information on individual exposure to allergens; (viii) initiate research on potential psychological, biochemical, immune, neural and even genomic markers of the placebo response; (ix) identify trial designs and primary endpoints that will give children with allergies easier, faster access to AIT formulations; and (x) promote and apply standardized methods for reporting systemic and local adverse events...
February 15, 2018: Allergy
https://www.readbyqxmd.com/read/29445915/correction-to-association-of-main-folate-metabolic-pathway-gene-polymorphisms-with-neural-tube-defects-in-han-population-of-northern-china
#20
Yulian Fang, Ruiping Zhang, Xiufang Zhi, Linsheng Zhao, Lirong Cao, Yizheng Wang, Chunquan Cai
The original version of this article unfortunately contained an error.
February 14, 2018: Child's Nervous System: ChNS: Official Journal of the International Society for Pediatric Neurosurgery
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