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https://www.readbyqxmd.com/read/29222925/quantification-of-photonic-localization-properties-of-targeted-nuclear-mass-density-variations-application-in-cancer-stage-detection
#1
Peeyush Sahay, Aditya Ganju, Huda M Almabadi, Hemendra M Ghimire, Murali M Yallapu, Omar Skalli, Meena Jaggi, Subhash C Chauhan, Prabhakar Pradhan
Light localization is a phenomenon which arises due to the interference effects of light waves inside a disordered optical medium. Quantification of degree light localization in optical media is widely used for characterizing degree of structural disorder in that media. Recently, this light localization approach was extended to analyze structural changes in biological cell like heterogeneous optical media, with potential application in cancer diagnostics. Confocal fluorescence microscopy was used to construct 'optical lattices', which represents 2D refractive index map corresponding to the spatial mass density distribution of a selected molecule inside the cell...
December 9, 2017: Journal of Biophotonics
https://www.readbyqxmd.com/read/29222403/common-pathophysiology-in-multiple-mouse-models-of-pitt-hopkins-syndrome
#2
Courtney Thaxton, Alexander D Kloth, Ellen P Clark, Sheryl S Moy, Raymond A Chitwood, Benjamin D Philpot
Mutations or deletions of the transcription factor TCF4 are linked to Pitt-Hopkins syndrome (PTHS) and schizophrenia, suggesting that the precise pathogenic mutations dictate cellular, synaptic, and behavioral consequences. Here we generated two novel mouse models of PTHS-one that mimics the most common pathogenic TCF4 point mutation (human R580W, mouse R579W) and one that deletes three pathogenic arginines-and explored phenotypes of these lines alongside models of pan-cellular or CNS-specific heterozygous Tcf4 disruption...
December 8, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/29218827/computational-study-of-estimating-3d-trabecular-bone-microstructure-for-the-volume-of-interest-from-ct-scan-data
#3
Jung Jin Kim, Jimin Nam, In Gwun Jang
Inspired by the self-optimizing capabilities of bone, a new concept of bone microstructure reconstruction has been recently introduced using 2D synthetic skeletal images. As a preliminary clinical study, this paper proposes a topology optimization-based method that can estimate 3D trabecular bone microstructure for the volume of interest (VOI) from 3D computed tomography (CT) scan data with enhanced computational efficiency and phenomenological accuracy. For this purpose, a localized finite element (FE) model is constructed by segmenting a target bone from CT scan data and determining the physiological local loads for the VOI...
December 7, 2017: International Journal for Numerical Methods in Biomedical Engineering
https://www.readbyqxmd.com/read/29218394/modulation-of-sphingosine-1-phosphate-s1p-attenuates-spatial-learning-and-memory-impairments-in-the-valproic-acid-rat-model-of-autism
#4
Hongmei Wu, Quanzhi Zhang, Jingquan Gao, Caihong Sun, Jia Wang, Wei Xia, Yonggang Cao, Yanqiu Hao, Lijie Wu
RATIONALE: Autism spectrum disorders (ASD) are a set of pervasive neurodevelopmental disorders that manifest in early childhood, and it is growing up to be a major cause of disability in children. However, the etiology and treatment of ASD are not well understood. In our previous study, we found that serum levels of sphingosine 1-phosphate (S1P) were increased significantly in children with autism, indicating that S1P levels may be involved in ASD. OBJECTIVE: The objective of this study was to identify a link between increased levels of S1P and neurobehavioral changes in autism...
December 7, 2017: Psychopharmacology
https://www.readbyqxmd.com/read/29218307/calreticulin-challenges-posed-by-the-intrinsically-disordered-nature-of-calreticulin-to-the-study-of-its-function
#5
Lilian Varricchio, Mario Falchi, Massimiliano Dall'Ora, Caterina De Benedittis, Alessandra Ruggeri, Vladimir N Uversky, Anna Rita Migliaccio
Calreticulin is a Ca2+-binding chaperone protein, which resides mainly in the endoplasmic reticulum but also found in other cellular compartments including the plasma membrane. In addition to Ca2+, calreticulin binds and regulates almost all proteins and most of the mRNAs deciding their intracellular fate. The potential functions of calreticulin are so numerous that identification of all of them is becoming a nightmare. Still the recent discovery that patients affected by the Philadelphia-negative myeloproliferative disorders essential thrombocytemia or primary myelofibrosis not harboring JAK2 mutations carry instead calreticulin mutations disrupting its C-terminal domain has highlighted the clinical need to gain a deeper understanding of the biological activity of this protein...
2017: Frontiers in Cell and Developmental Biology
https://www.readbyqxmd.com/read/29217410/munc18-1-haploinsufficiency-impairs-learning-and-memory-by-reduced-synaptic-vesicular-release-in-a-model-of-ohtahara-syndrome
#6
Albert Orock, Sreemathi Logan, Ferenc Deak
Ohtahara syndrome, also known as type 4 of Early Infantile Epileptic Encephalopathy with suppression bursts (EIEE-4) is currently an untreatable disorder that presents with seizures and impaired cognition. EIEE-4 patients have mutations most frequently in the STXBP1 gene encoding a Sec protein, munc18-1. The exact molecular mechanism of how these munc18-1 mutations cause impaired cognition, remains elusive. The leading haploinsufficiency hypothesis posits that mutations in munc18-1 render the protein unstable leading to its degradation...
December 4, 2017: Molecular and Cellular Neurosciences
https://www.readbyqxmd.com/read/29217357/tempol-prevents-post-traumatic-stress-disorder-induced-memory-impairment
#7
Karem H Alzoubi, Abeer M Rababa'h, Omar N Yaqoub
Post-traumatic stress disorder (PTSD) is a mental health disorder that can develop after a terrifying or life threatening event. Multiple symptoms are noticed in patients with PTSD including cognitive impairment, which was shown to be is associated with oxidative stress. Tempol is a highly efficient membrane-permeable antioxidant. In this study, we investigated the possible protective effect of tempol on PTSD-induced memory impairment. To test this hypothesis, we used single prolonged stress (SPS) model (2h restrain, 20min forced swimming, 15min rest, and 1-2min diethyl ether exposure) as a model of PTSD...
December 4, 2017: Physiology & Behavior
https://www.readbyqxmd.com/read/29216635/deficits-in-docosahexaenoic-acid-accrual-during-adolescence-reduce-rat-forebrain-white-matter-microstructural-integrity-an-in-vivo-diffusion-tensor-imaging-study
#8
Robert K McNamara, Jennifer D Schurdak, Ruth H Asch, Bart D Peters, Diana M Lindquist
Neuropsychiatric disorders that frequently initially emerge during adolescence are associated with deficits in the omega-3 (n-3) fatty acid docosahexaenoic acid (DHA), elevated proinflammatory signaling, and regional reductions in white matter integrity (WMI). This study determined the effects of altering brain DHA accrual during adolescence on WMI in the rat brain by diffusion tensor imaging (DTI), and investigated the potential mediating role of proinflammatory signaling. During periadolescent development, male rats were fed a diet deficient in n-3 fatty acids (DEF, n = 20), a fish oil-fortified diet containing preformed DHA (FO, n = 20), or a control diet (CON, n = 20)...
December 8, 2017: Developmental Neuroscience
https://www.readbyqxmd.com/read/29214257/piceatannol-attenuates-behavioral-disorder-and-neurological-deficits-in-aging-mice-via-activating-the-nrf2-pathway
#9
Yan Zhang, Li-Hong Zhang, Xi Chen, Ning Zhang, Guang Li
Aging is a complex process that is accompanied by neurological damage. Chronic injection of d-galactose (d-gal) can accelerate the aging process similar to natural aging and is commonly used to build an aging model to investigate aging. In the present study, the effects of piceatannol on d-gal-induced aging in mice were evaluated. Piceatannol treatment showed an observable anti-aging effect. Results obtained in vivo showed that piceatannol retained spontaneous motor activity and enhanced spatial learning and memory abilities in mice in which aging was induced by d-gal...
December 7, 2017: Food & Function
https://www.readbyqxmd.com/read/29213524/delirium-in-the-elderly-a-systematic-review-of-pharmacological-and-non-pharmacological-treatments
#10
Cecília Carboni Tardelli Cerveira, Cláudia Cristina Pupo, Sigrid De Sousa Dos Santos, José Eduardo Mourão Santos
Delirium is a common disorder associated with poor prognosis, especially in the elderly. The impact of different treatment approaches for delirium on morbimortality and long-term welfare is not completely understood. OBJECTIVE: To determine the efficacy of pharmacological and non-pharmacological treatments in elderly patients with delirium. METHODS: This systematic review compared pharmacological and non-pharmacological treatments in patients over 60 years old with delirium...
July 2017: Dementia & Neuropsychologia
https://www.readbyqxmd.com/read/29212538/a-pilot-investigation-of-audiovisual-processing-and-multisensory-integration-in-patients-with-inherited-retinal-dystrophies
#11
Mark H Myers, Alessandro Iannaccone, Gavin M Bidelman
BACKGROUND: In this study, we examined audiovisual (AV) processing in normal and visually impaired individuals who exhibit partial loss of vision due to inherited retinal dystrophies (IRDs). METHODS: Two groups were analyzed for this pilot study: Group 1 was composed of IRD participants: two with autosomal dominant retinitis pigmentosa (RP), two with autosomal recessive cone-rod dystrophy (CORD), and two with the related complex disorder, Bardet-Biedl syndrome (BBS); Group 2 was composed of 15 non-IRD participants (controls)...
December 7, 2017: BMC Ophthalmology
https://www.readbyqxmd.com/read/29211717/force-loading-explains-spatial-sensing-of-ligands-by-cells
#12
Roger Oria, Tina Wiegand, Jorge Escribano, Alberto Elosegui-Artola, Juan Jose Uriarte, Cristian Moreno-Pulido, Ilia Platzman, Pietro Delcanale, Lorenzo Albertazzi, Daniel Navajas, Xavier Trepat, José Manuel García-Aznar, Elisabetta Ada Cavalcanti-Adam, Pere Roca-Cusachs
Cells can sense the density and distribution of extracellular matrix (ECM) molecules by means of individual integrin proteins and larger, integrin-containing adhesion complexes within the cell membrane. This spatial sensing drives cellular activity in a variety of normal and pathological contexts. Previous studies of cells on rigid glass surfaces have shown that spatial sensing of ECM ligands takes place at the nanometre scale, with integrin clustering and subsequent formation of focal adhesions impaired when single integrin-ligand bonds are separated by more than a few tens of nanometres...
December 6, 2017: Nature
https://www.readbyqxmd.com/read/29210526/understanding-the-impact-of-film-disorder-and-local-surface-potential-in-ultraviolet-photoelectron-spectroscopy-of-pedot
#13
William A Muñoz, Xavier Crispin, Mats Fahlman, Igor V Zozoulenko
The spectra of conducting polymers obtained using ultraviolet photoelectron spectroscopy (UPS) exhibit a typical broadening of the tail σUPS ≈ 1 eV, which by an order of magnitude exceeds a commonly accepted value of the broadening of the tail of the density of states σDOS ≈ 0.1 eV obtained using transport measurements. In this work, an origin of this anomalous broadening of the tail of the UPS spectra in a doped conducting polymer, PEDOT (poly(3,4-ethylenedioxythiophene)), is discussed. Based on the semiempirical approach and using a realistic morphological model, the density of valence states in PEDOT doped with molecular counterions is computed...
December 6, 2017: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/29209962/effects-of-location-and-extent-of-spine-clustering-on-synaptic-integration-in-striatal-medium-spiny-neurons-a-computational-study
#14
Mrunal Rane, Rohit Manchanda
The nucleus accumbens (NAc) is known widely for its role in the reward circuit, which is dysregulated in a number of psychological disorders. Recent evidence also suggests the contribution of this structure in spatial and gustatory memories. Because of its role in different types of memories, similar to the hippocampus, we assumed the formation of spine clusters, which are engrams of memory, to be present on dendrites of medium spiny neurons (MSNs). We found that the activation of clustered inputs resulted in sublinear summation when clusters were present on the same branch and also when inputs were distributed on different branches...
December 6, 2017: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/29208317/protein-dynamics-in-the-solid-state-from-2h-nmr-lineshape-analysis-iii-momd-in-the-presence-of-magic-angle-spinning
#15
Eva Meirovitch, Zhichun Liang, Jack H Freed
We report on a new approach to the analysis of dynamic NMR lineshapes from polycrystalline (i.e., macroscopically disordered) samples in the presence of Magic Angle Spinning (MAS). This is an application of the Stochastic Liouville Equation developed by Freed and co-workers for treating restricted (i.e., microscopically ordered) motions. The 2H nucleus in an internally-mobile C-CD3 moiety serves as a prototype probe. The acronym is 2H/MOMD/MAS, where MOMD stands for "microscopic-order-macroscopic-disorder." The key elements describing internal motions - their type, the local spatial restrictions, and related features of local geometry - are treated in MOMD generally, within their rigorous three-dimensional tensorial requirements...
November 21, 2017: Solid State Nuclear Magnetic Resonance
https://www.readbyqxmd.com/read/29206893/the-cerebellar-cognitive-affective-schmahmann-syndrome-scale
#16
Franziska Hoche, Xavier Guell, Mark G Vangel, Janet C Sherman, Jeremy D Schmahmann
Cerebellar cognitive affective syndrome (CCAS; Schmahmann's syndrome) is characterized by deficits in executive function, linguistic processing, spatial cognition, and affect regulation. Diagnosis currently relies on detailed neuropsychological testing. The aim of this study was to develop an office or bedside cognitive screen to help identify CCAS in cerebellar patients. Secondary objectives were to evaluate whether available brief tests of mental function detect cognitive impairment in cerebellar patients, whether cognitive performance is different in patients with isolated cerebellar lesions versus complex cerebrocerebellar pathology, and whether there are cognitive deficits that should raise red flags about extra-cerebellar pathology...
December 1, 2017: Brain: a Journal of Neurology
https://www.readbyqxmd.com/read/29206639/electrical-impedance-tomography-in-children-with-community-acquired-pneumonia-preliminary-data
#17
Marta B Mazzoni, Alessandra Perri, Anna M Plebani, Silvia Ferrari, Giacomo Amelio, Alessia Rocchi, Dario Consonni, Gregorio P Milani, Emilio F Fossali
BACKGROUND: Electrical impedance tomography (EIT) is a noninvasive pulmonary function test that provides spatial and temporal information of changes in regional lung ventilation. We aimed to assess the feasibility of EIT as a supplementary tool in the evaluation of community acquired pneumonia in children. Furthermore, we performed a prospective evaluation of regional lung ventilation changes during a six-month follow-up period. METHODS: We enrolled otherwise healthy children aged 2-15 years with radiological diagnosis of community acquired pneumonia on admission at pediatric emergency department...
September 2017: Respiratory Medicine
https://www.readbyqxmd.com/read/29206106/effect-of-chain-stiffness-on-the-structure-of-single-chain-polymer-nanoparticles
#18
Angel J Moreno, Petra Bacova, Federica Lo Verso, Arantxa Arbe, Juan Colmenero, Jose A Pomposo
Polymeric single-chain nanoparticles (SCNPs) are soft nano-objects synthesized by purely intramolecular cross-linking of single polymer chains. By means of computer simulations, we investigate the conformational properties of SCNPs as a function of the bending stiffness of their linear polymer precursors. We investigate a broad range of characteristic ratios from the fully flexible case to those typical of bulky synthetic polymers. Increasing stiffness hinders bonding of groups separated by short contour distances and increases looping over longer distances, leading to more compact nanoparticles with a structure of highly interconnected loops...
December 5, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29203204/component-deficits-of-visual-neglect-magnetic-attraction-of-attention-vs-impaired-spatial-working-memory
#19
Monica N Toba, Marco Rabuffetti, Christophe Duret, Pascale Pradat-Diehl, Guido Gainotti, Paolo Bartolomeo
Visual neglect is a disabling consequence of right hemisphere damage, whereby patients fail to detect left-sided objects. Its precise mechanisms are debated, but there is some consensus that distinct component deficits may variously associate and interact in different patients. Here we used a touch-screen based procedure to study two putative component deficits of neglect, rightward "magnetic" attraction of attention and impaired spatial working memory, in a group of 47 right brain-damaged patients, of whom 33 had signs of left neglect...
December 1, 2017: Neuropsychologia
https://www.readbyqxmd.com/read/29202131/multifunctional-system-for-observing-measuring-and-analyzing-stimulation-evoked-neurochemical-signaling
#20
Christopher J Kimble, Joshua B Boesche, Diane R Eaker, Kenneth R Kressin, James K Trevathan, Seungleal Paek, Anders J Asp, Malcolm B McIntosh, J Luis Lujan
The ability to measure neurotransmitter activity using implanted electrochemical sensors offers researchers a potent technique for analyzing neural activity across specific neural circuitry. We have developed a wirelessly controlled device, WINCS Harmoni, to observe and measure neurotransmitter dynamics at up to four separate sensors, with high temporal and spatial resolution. WINCS Harmoni also incorporates a versatile neurostimulator that can be synchronized with electrochemical recording. The WINCS Harmoni platform is thus optimally suited for probing the neurochemical effects of neurostimulation, and may in turn enable the development of personalized therapies for multiple brain disorders...
May 2017: IEEE International Symposium on Medical Measurements and Applications: Proceedings
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