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https://www.readbyqxmd.com/read/29779184/limbic-system-structure-volumes-and-associated-neurocognitive-functioning-in-former-nfl-players
#1
Christian Lepage, Marc Muehlmann, Yorghos Tripodis, Jakob Hufschmidt, Julie Stamm, Katie Green, Pawel Wrobel, Vivian Schultz, Isabelle Weir, Michael L Alosco, Christine M Baugh, Nathan G Fritts, Brett M Martin, Christine Chaisson, Michael J Coleman, Alexander P Lin, Ofer Pasternak, Nikos Makris, Robert A Stern, Martha E Shenton, Inga K Koerte
Chronic traumatic encephalopathy (CTE) is a neurodegenerative disease associated with exposure to repetitive head impacts. CTE has been linked to disruptions in cognition, mood, and behavior. Unfortunately, the diagnosis of CTE can only be made post-mortem. Neuropathological evidence suggests limbic structures may provide an opportunity to characterize CTE in the living. Using 3 T magnetic resonance imaging, we compared select limbic brain regional volumes - the amygdala, hippocampus, and cingulate gyrus - between symptomatic former National Football League (NFL) players (n = 86) and controls (n = 22)...
May 19, 2018: Brain Imaging and Behavior
https://www.readbyqxmd.com/read/29778761/preferential-stabilization-of-newly-formed-dendritic-spines-in-motor-cortex-during-manual-skill-learning-predicts-performance-gains-but-not-memory-endurance
#2
Taylor A Clark, Min Fu, Andrew K Dunn, Yi Zuo, Theresa A Jones
Previous findings that skill learning is associated with the formation and preferential stabilization of new dendritic spines in cortex have raised the possibility that this preferential stabilization is a mechanism for lasting skill memory. We investigated this possibility in adult mice using in vivo two-photon imaging to monitor spine dynamics on superficial apical dendrites of layer V pyramidal neurons in motor cortex during manual skill learning. Spine formation increased over the first 3 days of training on a skilled reaching task, followed by increased spine elimination...
May 17, 2018: Neurobiology of Learning and Memory
https://www.readbyqxmd.com/read/29778641/subregional-volumes-of-the-hippocampus-in-relation-to-cognitive-function-and-risk-of-dementia
#3
Tavia E Evans, Hieab H H Adams, Silvan Licher, Frank J Wolters, Aad van der Lugt, M Kamran Ikram, Michael J O'Sullivan, Meike W Vernooij, M Arfan Ikram
BACKGROUND: Total hippocampal volume has been consistently linked to cognitive function and dementia. Yet, given its complex and parcellated internal structure, the role of subregions of the hippocampus in cognition and risk of dementia remains relatively underexplored. We studied subregions of the hippocampus in a large population-based cohort to further understand their role in cognitive impairment and dementia risk. METHODS: We studied 5035 dementia- and stroke-free persons from the Rotterdam Study, aged over 45 years...
May 17, 2018: NeuroImage
https://www.readbyqxmd.com/read/29778091/health-care-provider-experiences-in-primary-care-memory-clinics-a-phenomenological-study
#4
Linda Sheiban, Paul Stolee, Carrie McAiney, Veronique Boscart
BACKGROUND: There is a growing need for community-based services for persons with Alzheimer's disease and related dementias (ADRD). Memory clinic (MC) teams in primary care settings have been established to provide care to people with ADRD. To consider wider adoption of these MC teams, insight is needed into the experiences of practitioners working in these models. The purpose of the current study is to explore the experiences of health care providers (HCPs) who work in primary care Memory Clinic (MC) teams to provide care to persons with Alzheimer's disease and related dementias (ADRD)...
May 19, 2018: BMC Family Practice
https://www.readbyqxmd.com/read/29775775/knowledge-and-learning-of-verb-biases-in-amnesia
#5
Rachel Ryskin, Zhenghan Qi, Natalie V Covington, Melissa Duff, Sarah Brown-Schmidt
Verb bias-the co-occurrence frequencies between a verb and the syntactic structures it may appear with-is a critical and reliable linguistic cue for online sentence processing. In particular, listeners use this information to disambiguate sentences with multiple potential syntactic parses (e.g., Feel the frog with the feather.). Further, listeners dynamically update their representations of specific verbs in the face of new evidence about verb-structure co-occurrence. Yet, little is known about the biological memory systems that support the use and dynamic updating of verb bias...
May 15, 2018: Brain and Language
https://www.readbyqxmd.com/read/29773980/anatomical-inputs-from-the-sensory-and-value-structures-to-the-tail-of-the-rat-striatum
#6
Haiyan Jiang, Hyoung F Kim
The caudal region of the rodent striatum, called the tail of the striatum (TS), is a relatively small area but might have a distinct function from other striatal subregions. Recent primate studies showed that this part of the striatum has a unique function in encoding long-term value memory of visual objects for habitual behavior. This function might be due to its specific connectivity. We identified inputs to the rat TS and compared those with inputs to the dorsomedial striatum (DMS) in the same animals. The TS directly received anatomical inputs from both sensory structures and value-coding regions, but the DMS did not...
2018: Frontiers in Neuroanatomy
https://www.readbyqxmd.com/read/29773397/self-healable-tough-supramolecular-hydrogels-crosslinked-by-poly-cyclodextrin-through-host-guest-interaction
#7
Tingting Cai, Shuangjun Huo, Tao Wang, Weixiang Sun, Zhen Tong
A new supramolecular hydrogel with superior self-healing and shape memory properties was synthesized via in-situ copolymerization of the adamantane-containing monomer N-adamantylacrylamide (Ad-AAm) and monomer acrylic acid (AAc) in the polycyclodextrin (PCD) aqueous solution, where PCD served as the polyfunctional physical cross-linker. The PCD-Ad hydrogels showed strength of 40 kPa with breaking strain of 600%, but small tensile loading-unloading hysteresis and residual deformation benefited from the reversible crosslinking structure...
August 1, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29772110/morphology-and-memory-toward-an-integrated-theory
#8
Ray Jackendoff, Jenny Audring
Framed in psychological terms, the basic question of linguistic theory is what is stored in memory, and in what form. Traditionally, what is stored is divided into grammar and lexicon, where grammar contains the rules and the lexicon is an unstructured list of exceptions. We develop an alternative view in which rules of grammar are simply lexical items that contain variables, and in which rules have two functions. In their generative function, they are used to build novel structures, just as in traditional generative linguistics...
May 17, 2018: Topics in Cognitive Science
https://www.readbyqxmd.com/read/29770832/high-strain-slide-ring-shape-memory-polycaprolactone-based-polyurethane
#9
Ruiqing Wu, Jingjuan Lai, Yi Pan, Zhaohui Zheng, Xiaobin Ding
To enable shape-memory polymer networks to achieve recoverable high deformability with a simultaneous high shape-fixity ratio and shape-recovery ratio, novel semi-crystalline slide-ring shape-memory polycaprolactone-based polyurethane (SR-SMPCLU) with movable net-points constructed by a topologically interlocked slide-ring structure was designed and fabricated. The SR-SMPCLU not only exhibited good shape fixity, almost complete shape recovery, and a fast shape-recovery speed, it also showed an outstanding recoverable high-strain capacity with 95...
May 17, 2018: Soft Matter
https://www.readbyqxmd.com/read/29770422/biodegradable-toughened-nanohybrid-shape-memory-polymer-for-smart-biomedical-applications
#10
Arpan Biswas, Akhand Pratap Singh, Dipak Rana, Vinod K Aswal, Pralay Maiti
A polyurethane nanohybrid has been prepared through the in situ polymerization of an aliphatic diisocyanate, ester polyol and a chain extender in the presence of two-dimensional platelets. Polymerization within the platelet galleries helps to intercalate, generate diverse nanostructure and improve the nano to macro scale self-assembly, which leads to a significant enhancement in the toughness and thermal stability of the nanohybrid in comparison to pure polyurethane. The extensive interactions, the reason for property enhancement, between nanoplatelets and polymer chains are revealed through spectroscopic measurements and thermal studies...
May 17, 2018: Nanoscale
https://www.readbyqxmd.com/read/29770112/circadian-plasticity-in-the-brain-of-insects-and-rodents
#11
REVIEW
Wojciech Krzeptowski, Grzegorz Hess, Elżbieta Pyza
In both vertebrate and invertebrate brains, neurons, glial cells and synapses are plastic, which means that the physiology and structure of these components are modified in response to internal and external stimuli during development and in mature brains. The term plasticity has been introduced in the last century to describe experience-dependent changes in synapse strength and number. These changes result from local functional and morphological synapse modifications; however, these modifications also occur more commonly in pre- and postsynaptic neurons...
2018: Frontiers in Neural Circuits
https://www.readbyqxmd.com/read/29768852/probing-spin-state-switching-in-fe-phen-%C3%A2-ncs-%C3%A2-thin-film-nanocrystals-on-different-substrates-by-electrical-conductivity-measurements
#12
Chaitali Mondal, Suvra Pal, Swapan K Mandal
Spin-state switching mechanism is investigated by measuring the temperature of the electrical conductivity of spin crossover (SCO) material Fe(phen)2(NCS)2 thin films grown on glass, quartz and silicon substrates. The morphology characterized by scanning electron microscopy, clearly reveals the growth of thin films of thickness ~300 nm comprising of nanocrystals, size and distribution of which is dependent on the nature of substrates. The film on quartz is found to have the most uniform growth of nanocrystals of size ~22 nm with a homogeneous distribution...
January 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29767380/analysis-of-an-attractor-neural-network-s-response-to-conflicting-external-inputs
#13
Kathryn Hedrick, Kechen Zhang
The theory of attractor neural networks has been influential in our understanding of the neural processes underlying spatial, declarative, and episodic memory. Many theoretical studies focus on the inherent properties of an attractor, such as its structure and capacity. Relatively little is known about how an attractor neural network responds to external inputs, which often carry conflicting information about a stimulus. In this paper we analyze the behavior of an attractor neural network driven by two conflicting external inputs...
May 16, 2018: Journal of Mathematical Neuroscience
https://www.readbyqxmd.com/read/29767353/influences-of-temporal-lobe-epilepsy-and-temporal-lobe-resection-on-olfaction
#14
Richard L Doty, Isabelle Tourbier, Jessica K Neff, Jonathan Silas, Bruce Turetsky, Paul Moberg, Taehoon Kim, John Pluta, Jaqueline French, Ashwini D Sharan, Michael J Sperling, Natasha Mirza, Anthony Risser, Gordon Baltuch, John A Detre
Although temporal lobe epilepsy (TLE) and resection (TLR) impact olfactory eloquent brain structures, their influences on olfaction remain enigmatic. We sought to more definitively assess the influences of TLE and TLR on olfaction using three well-validated olfactory tests and measuring  the tests' associations with the volume of numerous temporal lobe brain structures. The University of Pennsylvania Smell Identification Test and an odor detection threshold test were administered to 71 TLE patients and 71 age- and sex-matched controls; 69 TLE patients and controls received an odor discrimination/memory test...
May 16, 2018: Journal of Neurology
https://www.readbyqxmd.com/read/29767344/in-memory-of-achim-trebst-1929-2017-a-pioneer-of-photosynthesis-research
#15
Hermann Bothe, Thomas Happe, Simon Trebst, Matthias Rögner
The life and work of Achim Trebst (1929-2017) was dedicated to photosynthesis, involving a wide span of seminal contributions which cumulated in more than five decades of active research: Major topics include the separation of light and dark phases in photosynthesis, the elucidation of photosynthesis by the use of inhibitors, the identification of the three-dimensional structure of photosystem II and its degradation, and an explanation of singlet oxygen formation. For this tribute, which has been initiated by Govindjee, twenty-two personal tributes by former coworkers, scientific friends, and his family have been compiled and combined with an introduction tracing the different stages of Achim Trebst's scientific life...
May 16, 2018: Photosynthesis Research
https://www.readbyqxmd.com/read/29765395/progressive-neurological-decline-with-deep-bilateral-imaging-changes-a-protean-presentation-of-dural-arteriovenous-fistulae
#16
Rene A Colorado, Marcelo Matiello, Hyun-Sik Yang, James D Rabinov, Aman Patel, Joshua A Hirsch, Ram Chavali, Thabele M Leslie-Mazwi
Intracranial dural arteriovenous fistulae (DAVF) within the deep cerebral vasculature are diagnostically challenging because of their variable clinical presentation and typical bilateral neuroimaging findings mimicking inflammatory, infectious, and metabolic processes. Increasingly, reports have emerged highlighting the diagnostic and treatment challenges of these lesions and their associated high morbidity and rapid clinical deterioration when untreated. We describe here a case series of 4 patients with deep cerebral DAVF who presented with impaired arousal or memory and behavioral changes...
April 2018: Interventional Neurology
https://www.readbyqxmd.com/read/29765316/noradrenergic-dysfunction-in-alzheimer-s-and-parkinson-s-diseases-an-overview-of-imaging-studies
#17
REVIEW
Andrew C Peterson, Chiang-Shan R Li
Noradrenergic dysfunction contributes to cognitive impairment in Alzheimer's Disease (AD) and Parkinson's Disease (PD). Conventional therapeutic strategies seek to enhance cholinergic and dopaminergic neurotransmission in AD and PD, respectively, and few studies have examined noradrenergic dysfunction as a target for medication development. We review the literature of noradrenergic dysfunction in AD and PD with a focus on human imaging studies that implicate the locus coeruleus (LC) circuit. The LC sends noradrenergic projections diffusely throughout the cerebral cortex and plays a critical role in attention, learning, working memory, and cognitive control...
2018: Frontiers in Aging Neuroscience
https://www.readbyqxmd.com/read/29765302/the-role-of-actin-cytoskeleton-in-dendritic-spines-in-the-maintenance-of-long-term-memory
#18
REVIEW
Sreetama Basu, Raphael Lamprecht
Evidence indicates that long-term memory formation involves alterations in synaptic efficacy produced by modifications in neural transmission and morphology. However, it is not clear how such alterations induced by learning, that encode memory, are maintained over long period of time to preserve long-term memory. This is especially intriguing as the half-life of most of the proteins that underlie such changes is usually in the range of hours to days and these proteins may change their location over time. In this review we describe studies that indicate the involvement of dendritic spines in memory formation and its maintenance...
2018: Frontiers in Molecular Neuroscience
https://www.readbyqxmd.com/read/29765061/chemical-and-structural-analysis-on-magnetic-tunnel-junctions-using-a-decelerated-scanning-electron-beam
#19
Edward Jackson, Mingling Sun, Takahide Kubota, Koki Takanashi, Atsufumi Hirohata
Current information technology relies on the advancement of nanofabrication techniques. For instance, the latest computer memories and hard disk drive read heads are designed with a 12 nm node and 20 nm wide architectures, respectively. With matured nanofabrication processes, a yield of such nanoelectronic devices is typically up to about 90%. To date the yield has been compensated with redundant hardware and software error corrections. In the latest memories, approximately 5% redundancy and parity bits for error corrections are used, which increase the total production cost of the devices...
May 15, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29762177/neuropsychological-phenotypes-among-men-with-and-without-hiv-disease-in-the-multicenter-aids-cohort-study
#20
Samantha A Molsberry, Yu Cheng, Lawrence Kingsley, Lisa Jacobson, Andrew J Levine, Eileen Martin, Eric N Miller, Cynthia A Munro, Ann Ragin, Ned Sacktor, James T Becker
OBJECTIVE: Mild forms of HIV-associated neurocognitive disorder (HAND) remain prevalent in the combination anti-retroviral therapy (cART) era. This study's objective was to identify neuropsychological subgroups within the Multicenter AIDS Cohort Study (MACS) based on the participant-based latent structure of cognitive function and to identify factors associated with subgroups. DESIGN: The MACS is a four-site longitudinal study of the natural and treated history of HIV disease among gay and bisexual men...
May 11, 2018: AIDS
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