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https://www.readbyqxmd.com/read/27933553/spontaneous-honeybee-behaviour-is-altered-by-persistent-organic-pollutants
#1
Jade Drummond, Sally M Williamson, Ann E Fitchett, Geraldine A Wright, Sarah J Judge
The effect of environmental pollutants on honeybee behaviour has focused mainly on currently used pesticides. However, honeybees are also exposed to persistent organic pollutants (POPs). The aim of this laboratory based study was to determine if exposure to sublethal field-relevant concentrations of POPs altered the spontaneous behaviour of foraging-age worker honeybees. Honeybees (Apis mellifera) were orally exposed to either a sublethal concentration of the polychlorinated biphenyl (PCB) mixture Aroclor 1254 (100 ng/ml), the organochlorine insecticide lindane (2...
December 8, 2016: Ecotoxicology
https://www.readbyqxmd.com/read/27931169/a-mouse-model-of-bilateral-cervical-contusion-compression-spinal-cord-injury
#2
Nicole Forgione, Mahmood Chamankhah, Michael Fehlings
Cervical spinal cord injury (cSCI) occurs in over half of all cases of traumatic SCI, yet we lack therapies that can generate significant functional recovery in these patients. The development of animal models of cSCI will aid in the pre-clinical assessment of therapies and in understanding basic pathophysiological mechanisms. Here we describe a clinically relevant model of cervical contusion-compression injury in the mouse. Using a modified aneurism clip we generated a bilateral, incomplete injury that mimics contusion-compression injuries most commonly seen in humans...
December 8, 2016: Journal of Neurotrauma
https://www.readbyqxmd.com/read/27928963/role-of-neurotrophic-factors-in-parkinson%C3%A2-s-disease
#3
Diogo Tomé, Carla Pais Fonseca, Filipa Lopes Campos, Graça Baltazar
Parkinson's disease is an age-associated progressive neurodegenerative disorder that has gained crescent social and economic impact due to the aging of the western society. All current therapies are symptomatic and fail to reverse or halt the progression of dopaminergic neurons loss. The discovery of the capability of neurotrophic factors to protect these neurons lead numerous research groups to focus their efforts in developing therapies aiming at promoting the control of Parkinson´s disease through the delivery of neurotrophic factors to the brain or by boosting their endogenous levels...
December 8, 2016: Current Pharmaceutical Design
https://www.readbyqxmd.com/read/27925292/cognitive-impairment-in-parkinson-s-disease-impact-on-quality-of-life-of-carers
#4
R A Lawson, A J Yarnall, F Johnston, G W Duncan, T K Khoo, D Collerton, J P Taylor, D J Burn
BACKGROUND: The quality of life (QoL) of informal caregivers of people with Parkinson's disease (PD) (PwP) can be affected by the caring role. Because of cognitive symptoms and diminished activities of daily living, in addition to the management of motor symptoms, carers of PwP and cognitive impairment may experience increased levels of burden and poorer QoL compared with carers of PwP without cognitive impairment. This study aimed to investigate the impact of cognitive impairment in PD upon QoL of carers...
December 7, 2016: International Journal of Geriatric Psychiatry
https://www.readbyqxmd.com/read/27924962/attenuation-of-unpredictable-chronic-mild-stress-induced-deficits-in-rats-by-apomorphine
#5
Muhammad Farhan, Darakshan Jabeen Haleem
OBJECTIVE: To investigate the effects of repeated doses of apomorphine in rats exposed to unpredictable chronic mild stress. METHODS: The experimental case-control study was conducted in March 2011 at the Department of Biochemistry, University of Karachi, and comprised albino-wistar rats. The experimental animals were exposed to a schedule of unpredictable chronic mild stress, while control animals were left in the cages. Animals of stressed and unstressed group were administrated with apomorphine at dose of 1...
December 2016: JPMA. the Journal of the Pakistan Medical Association
https://www.readbyqxmd.com/read/27920261/effects-of-repetitive-transcranial-magnetic-stimulation-combined-with-sensory-cueing-on-unilateral-neglect-in-subacute-patients-with-right-hemispheric-stroke-a-randomized-controlled-study
#6
Nicole Yh Yang, Kenneth Nk Fong, Cecilia Wp Li-Tsang, D Zhou
OBJECTIVE: To compare the effects of rTMS combined with sensory cueing, rTMS alone, and conventional rehabilitation on unilateral neglect, hemiplegic arm functions and performance of activities of daily living. DESIGN: A single-blinded randomized controlled trial. SETTING: A convalescent hospital. SUBJECTS: Sixty inpatients with left unilateral neglect after stroke. INTERVENTIONS: Patients were randomly assigned to three groups: rTMS combined with sensory cueing, rTMS, and conventional rehabilitation alone...
December 5, 2016: Clinical Rehabilitation
https://www.readbyqxmd.com/read/27919750/mapping-the-functional-connectome-in-traumatic-brain-injury-what-can-graph-metrics-tell-us
#7
Karen Caeyenberghs, Helena Verhelst, Adam Clemente, Peter H Wilson
OBJECTIVE: Traumatic brain injury (TBI) is associated with cognitive and motor deficits, and poses a significant personal, societal, and economic burden. One mechanism by which TBI is thought to affect cognition and behaviour is through changes in functional connectivity. Graph theory is a powerful framework for quantifying topological features of neuroimaging-derived functional networks. The objective of this paper is to review studies examining functional connectivity in TBI with an emphasis on graph theoretical analysis that is proving to be valuable in uncovering network abnormalities in this condition...
December 2, 2016: NeuroImage
https://www.readbyqxmd.com/read/27917304/quality-of-life-of-cypriot-patients-suffering-with-huntington-s-disease
#8
Eleni Varda, Christiana A Demetriou, Alexandros Heraclides, Yiolanda P Christou, Eleni Zamba-Papanicolaou
INTRODUCTION: Huntington's disease (HD) has profound motor, behavioural and cognitive symptoms. Despite the enormous burden of this disease on the quality of life (QoL) of patients and their families, there is very limited evidence on this topic. Considering the severity of HD patients, and the high prevalence in Cyprus more studies are needed to assess QoL among Cypriot patients, in order to improve our knowledge about their living conditions and to assist the management of this condition...
October 25, 2016: PLoS Currents
https://www.readbyqxmd.com/read/27916670/pseudoneglect-in-line-bisection-judgement-is-associated-with-a-modulation-of-right-hemispheric-spatial-attention-dominance-in-right-handers
#9
Laure Zago, Laurent Petit, Gael Jobard, Julien Hay, Bernard Mazoyer, Nathalie Tzourio-Mazoyer, Hans-Otto Karnath, Emmanuel Mellet
The objective of this study was to validate a line bisection judgement (LBJ) task for use in investigating the lateralized cerebral bases of spatial attention in a sample of 51 right-handed healthy participants. Using functional magnetic resonance imaging (fMRI), the participants performed a LBJ task that was compared to a visuomotor control task during which the participants made similar saccadic and motoric responses. Cerebral lateralization was determined using a voxel-based functional asymmetry analysis and a hemispheric functional lateralization index (HFLI) computed from fMRI contrast images...
December 1, 2016: Neuropsychologia
https://www.readbyqxmd.com/read/27914650/towards-upright-pedalling-to-drive-recovery-in-people-who-cannot-walk-in-the-first-weeks-after-stroke-movement-patterns-and-measurement
#10
Nicola J Hancock, Lee Shepstone, Philip Rowe, Phyo K Myint, Valerie M Pomeroy
OBJECTIVES: To examine whether people who are within 31days of stroke onset are able to produce controlled lower limb movement, and phasic activity in antagonistic lower limb muscle groups, during Upright Pedalling (UP). DESIGN: Observational study. SETTING: Acute stroke unit within a University Hospital. PARTICIPANTS: Eight adults between 3 and 30days from stroke onset, with unilateral lower limb paresis and unable to walk without assistance...
November 15, 2016: Physiotherapy
https://www.readbyqxmd.com/read/27913408/neurophysiological-mechanisms-of-cortical-plasticity-impairments-in-schizophrenia-and-modulation-by-the-nmda-receptor-agonist-d-serine
#11
Joshua T Kantrowitz, Michael L Epstein, Odeta Beggel, Stephanie Rohrig, Jonathan M Lehrfeld, Nadine Revheim, Nayla P Lehrfeld, Jacob Reep, Emily Parker, Gail Silipo, Merav Ahissar, Daniel C Javitt
Schizophrenia is associated with deficits in cortical plasticity that affect sensory brain regions and lead to impaired cognitive performance. Here we examined underlying neural mechanisms of auditory plasticity deficits using combined behavioural and neurophysiological assessment, along with neuropharmacological manipulation targeted at the N-methyl-D-aspartate type glutamate receptor (NMDAR). Cortical plasticity was assessed in a cohort of 40 schizophrenia/schizoaffective patients relative to 42 healthy control subjects using a fixed reference tone auditory plasticity task...
December 2016: Brain: a Journal of Neurology
https://www.readbyqxmd.com/read/27910992/tug-of-war-between-two-elastically-coupled-molecular-motors-a-case-study-on-force-generation-and-force-balance
#12
Mehmet Can Uçar, Reinhard Lipowsky
Intracellular transport is performed by molecular motors that pull cargos along cytoskeletal filaments. Many cellular cargos are observed to move bidirectionally, with fast transport in both directions. This behaviour can be understood as a stochastic tug-of-war between two teams of antagonistic motors. The first theoretical model for such a tug-of-war, the Müller-Klumpp-Lipowsky (MKL) model, was based on two simplifying assumptions: (i) both motor teams move with the same velocity in the direction of the stronger team, and (ii) this velocity matching and the associated force balance arise immediately after the rebinding of an unbound motor to the filament...
December 2, 2016: Soft Matter
https://www.readbyqxmd.com/read/27908630/non-linear-dose-response-of-aluminium-hydroxide-adjuvant-particles-selective-low-dose-neurotoxicity
#13
Guillemette Crépeaux, Housam Eidi, Marie-Odile David, Yasmine Baba-Amer, Eleni Tzavara, Bruno Giros, François-Jérôme Authier, Christopher Exley, Christopher A Shaw, Josette Cadusseau, Romain K Gherardi
Aluminium (Al) oxyhydroxide (Alhydrogel(®)), the main adjuvant licensed for human and animal vaccines, consists of primary nanoparticles that spontaneously agglomerate. Concerns about its safety emerged following recognition of its unexpectedly long-lasting biopersistence within immune cells in some individuals, and reports of chronic fatigue syndrome, cognitive dysfunction, myalgia, dysautonomia and autoimmune/inflammatory features temporally linked to multiple Al-containing vaccine administrations. Mouse experiments have documented its capture and slow transportation by monocyte-lineage cells from the injected muscle to lymphoid organs and eventually the brain...
November 28, 2016: Toxicology
https://www.readbyqxmd.com/read/27907249/grainyhead-like-3-grhl3-deficiency-in-brain-leads-to-altered-locomotor-activity-and-decreased-anxiety-like-behaviours-in-aged-mice
#14
Sebastian Dworkin, Alana Auden, Darren D Partridge, Maria Daglas, Robert L Medcalf, Theo Mantamadiotis, Smitha R Georgy, Charbel Darido, Stephen M Jane, Stephen B Ting
The highly conserved Grainyhead-like (Grhl) family of transcription factors, comprising three members in vertebrates (Grhl1-3), play critical regulatory roles during embryonic development, cellular proliferation and apoptosis. Although loss of Grhl function leads to multiple neural abnormalities in numerous animal models, a comprehensive analysis of Grhl expression and function in the mammalian brain has not been reported. Here we show that only Grhl3 expression is detectable in the embryonic mouse brain; particularly within the habenula, an organ known to modulate repressive behaviours...
December 1, 2016: Developmental Neurobiology
https://www.readbyqxmd.com/read/27906686/investigation-of-collective-behaviour-and-electrocommunication-in-the-weakly-electric-fish-mormyrus-rume-through-a-biomimetic-robotic-dummy-fish
#15
Elisa Donati, Martin Worm, Stefano Mintchev, Marleen van der Wiel, Giovanni Benelli, Gerhard von der Emde, Cesare Stefanini
A robotic fish has been developed to create a mixed bio-hybrid system made up of weakly electric fish and a mobile dummy fish. Weakly electric fish are capable of interacting with each other via sequences of self-generated electric signals during electrocommunication. Here we present the design of an artificial dummy fish, which is subsequently tested in behavioural experiments. The robot consists of two parts: a flexible tail that can move at different frequencies and amplitudes, performing a carangiform oscillation, and a rigid head containing the motor for the tail oscillation...
December 1, 2016: Bioinspiration & Biomimetics
https://www.readbyqxmd.com/read/27903878/a-spiking-neural-model-of-adaptive-arm-control
#16
Travis DeWolf, Terrence C Stewart, Jean-Jacques Slotine, Chris Eliasmith
We present a spiking neuron model of the motor cortices and cerebellum of the motor control system. The model consists of anatomically organized spiking neurons encompassing premotor, primary motor, and cerebellar cortices. The model proposes novel neural computations within these areas to control a nonlinear three-link arm model that can adapt to unknown changes in arm dynamics and kinematic structure. We demonstrate the mathematical stability of both forms of adaptation, suggesting that this is a robust approach for common biological problems of changing body size (e...
November 30, 2016: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/27903707/formation-of-long-term-locomotor-memories-is-associated-with-functional-connectivity-changes-in-the-cerebellar-thalamic-cortical-network
#17
Firas Mawase, Simona Bar-Haim, Lior Shmuelof
: Although motor adaptation is typically rapid, accumulating evidence shows that it is also associated with long-lasting behavioural and neuronal changes. Two processes were suggested to explain the formation of long-term motor memories: recall -- reflecting a retrieval of previous motor actions, and faster relearning -- reflecting an increased sensitivity to errors. While these manifestations of motor memories were initially demonstrated in the context of adaptation experiments in reaching, indications of long-term motor memories were also recently demonstrated in other kinds of adaptation, such as in locomotor adaptation...
November 30, 2016: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/27899280/behavioural-phenotype-of-histamine-h4-receptor-knockout-mice-focus-on-central-neuronal-functions
#18
Maria Domenica Sanna, Carla Ghelardini, Robin L Thurmond, Emanuela Masini, Nicoletta Galeotti
The functional expression of H4 receptors (H4R) within neurons of the central nervous system has been recently reported, but their role is poorly understood. The present study aims to elucidate the role of neuronal H4R by providing the first description of the behavioural phenotype of H4R-deficient (H4R knockout, H4R-KO) mice. Mice lacking H4R underwent behavioural studies to evaluate locomotor activity, pain perception, anxiety, depression, memory and feeding behaviour. H4R-KO mice showed a significant increase in ambulation in an open field as well as in exploratory activity in the absence of any modification of motor coordination...
November 27, 2016: Neuropharmacology
https://www.readbyqxmd.com/read/27896632/tactile-suppression-in-goal-directed-movement
#19
Georgiana Juravle, Gordon Binsted, Charles Spence
Sharing numerous characteristics with suppression in the other senses, tactile suppression is a reliable phenomenon that accompanies movement. By investigating the simplest of movements (e.g., finger flexions), early research tried to explain the origins of the phenomenon in terms of motor command generation together with sensory reafference. Here, we review recent research that has delved into (naturalistic) goal-directed movements. In connection with goal-directed movement, tactile suppression is evident as a decrease in behavioural performance measured shortly prior to, and during, movement execution...
November 28, 2016: Psychonomic Bulletin & Review
https://www.readbyqxmd.com/read/27894930/sex-dependent-influence-of-chronic-mild-stress-cms-on-voluntary-alcohol-consumption-study-of-neurobiological-consequences
#20
Eva M Marco, Javier Antonio Ballesta, Carlos Irala, María-Donina Hernández, María Elisa Serrano, Virginia Mela, Meritxell López-Gallardo, María-Paz Viveros
Alcohol use disorder and depression are highly comorbid, and both conditions exhibit important sexual dimorphisms. Here, we aimed to investigate voluntary alcohol consumption after 6weeks of chronic mild stress (CMS) in Wistar rats - employed as an animal model of depression. Male and female rats were investigated, and changes in several molecular markers were analysed in frontal cortex (FCx) and hippocampal formation (HF). CMS induced depressive-like responses in the forced swimming test - increased immobility time - in male and female animals, without affecting anhedonia (sucrose preference test) nor motor activity (holeboard); body weight gain and food intake were diminished only among CMS males...
November 25, 2016: Pharmacology, Biochemistry, and Behavior
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