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https://www.readbyqxmd.com/read/28938207/zinc-oxide-nanoparticles-in-predicted-environmentally-relevant-concentrations-leading-to-behavioral-impairments-in-male-swiss-mice
#1
Joyce Moreira de Souza, Bruna de Oliveira Mendes, Abraão Tiago Batista Guimarães, Aline Sueli de Lima Rodrigues, Thales Quintão Chagas, Thiago Lopes Rocha, Guilherme Malafaia
Although the potential neurotoxic effects from the exposure to zinc oxide nanoparticles (ZnO NPs) on humans and on experimental models have been reported in previous studies, the effects from the exposure to environmentally relevant concentrations of them remain unclear. Thus, the aim of the present study is to investigate the effects from the exposure to environmentally relevant concentrations of ZnO NPs on the behavior of male Swiss mice. The animals were daily exposed to environmentally relevant concentrations of ZnO NPs (5...
September 19, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28935857/sensorimotor-computation-underlying-phototaxis-in-zebrafish
#2
Sébastien Wolf, Alexis M Dubreuil, Tommaso Bertoni, Urs Lucas Böhm, Volker Bormuth, Raphaël Candelier, Sophia Karpenko, David G C Hildebrand, Isaac H Bianco, Rémi Monasson, Georges Debrégeas
Animals continuously gather sensory cues to move towards favourable environments. Efficient goal-directed navigation requires sensory perception and motor commands to be intertwined in a feedback loop, yet the neural substrate underlying this sensorimotor task in the vertebrate brain remains elusive. Here, we combine virtual-reality behavioural assays, volumetric calcium imaging, optogenetic stimulation and circuit modelling to reveal the neural mechanisms through which a zebrafish performs phototaxis, i.e...
September 21, 2017: Nature Communications
https://www.readbyqxmd.com/read/28935816/forces-to-pierce-cuticle-of-tarsi-and-material-properties-determined-by-nanoindentation-the-achilles-heel-of-bed-bugs
#3
Jorge Bustamante, Jason F Panzarino, Timothy J Rupert, Catherine Loudon
The mechanical properties of bed bug (Cimex lectularius L.) tarsi and pretarsi were investigated in order to evaluate their vulnerability to piercing by plant trichomes (sharp microscopic hairs). Nanoindentation was used to measure the force required to insert a sharp probe into the cuticle of these different regions, as well as to determine creep and reduced elastic moduli for the cuticle. Scanning electron microscopy was used to visualize the indents that had been generated by nanoindentation. The force required to insert a cube corner nanoindenter probe into the cuticle was determined for a range of displacements (1 to 9 µm) and strain rates (0...
September 21, 2017: Biology Open
https://www.readbyqxmd.com/read/28935766/serotonin-2b-receptors-in-mesoaccumbens-dopamine-pathway-regulate-cocaine-responses
#4
Stéphane Doly, Emily Quentin, Raphaël Eddine, Stefania Tolu, Sebastian P Fernandez, Jesus Bertran-Gonzalez, Emmanuel Valjent, Arnauld Belmer, Xavier Viñals, Jacques Callebert, Philippe Faure, Frank J Meye, Denis Hervé, Patricia Robledo, Manuel Mameli, Jean-Marie Launay, Rafael Maldonado, Luc Maroteaux
Addiction is a maladaptive pattern of behavior following repeated use of reinforcing drugs in predisposed individuals, and leading to lifelong changes. A common substrate of these changes lies in alterations of neurons releasing dopamine in the ventral and dorsal territories of the striatum. The serotonin 5-HT2B receptor has been involved in various behaviors including impulsivity, response to antidepressants and to psychostimulants pointing toward putative interactions with the dopamine system. Despite these findings, it remains unknown whether 5-HT2B receptors directly modulate dopaminergic activity and the possible mechanisms involved...
September 21, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28934336/the-oldest-record-of-aquatic-amniote-congenital-scoliosis
#5
Tomasz Szczygielski, Dawid Surmik, Agnieszka Kapuścińska, Bruce M Rothschild
We report the first occurrence of congenital scoliosis in an early Permian aquatic parareptile, Stereosternum tumidum from Paraná state, Brazil. The spine malformation is caused by a congenital hemivertebra. These observations give insight into the biomechanical aspects of underwater locomotion in an axial skeleton-compromised aquatic amniote. This is the oldest record of a hemivertebra in an aquatic animal.
2017: PloS One
https://www.readbyqxmd.com/read/28933238/staged-decrease-of-physical-ability-on-the-locomotive-syndrome-risk-test-is-related-to-neuropathic-pain-nociceptive-pain-shoulder-complaints-and-quality-of-life-in-middle-aged-and-elderly-people-the-utility-of-the-locomotive-syndrome-risk-test
#6
Shiro Imagama, Yukiharu Hasegawa, Kei Ando, Kazuyoshi Kobayashi, Tetsuro Hida, Kenyu Ito, Mikito Tsushima, Yoshihiro Nishida, Naoki Ishiguro
OBJECTIVES: A locomotive syndrome (LS) risk test for evaluation of physical ability is recently proposed. The objective of this study is to evaluate the utility of this test by examining physical ability, neuropathic pain, nociceptive pain, shoulder complaints, and quality of life (QOL). METHODS: A prospective cohort study was conducted in 523 subjects (240 males, 283 females; mean age: 63.3 years) at a health checkup. Data collected using visual analog scales (VAS) for shoulder pain, low back pain, sciatica, and knee pain, neuropathic pain, shoulder complaint, body mass index (BMI), osteoporosis, and SF-36 were compared among three LS risk stages...
February 16, 2017: Modern Rheumatology
https://www.readbyqxmd.com/read/28932003/quantitative-assessment-of-locomotive-syndrome-by-the-loco-check-questionnaire-in-older-japanese-females
#7
Sachiko Noge, Tatsuo Ohishi, Takuya Yoshida, Hiromichi Kumagai
[Purpose] Locomotive syndrome (LS) is a condition by which older people may require care service because of problems with locomotive organs. This study examined whether the loco-check, a 7-item questionnaire, is useful for quantitatively assessing the severity of LS. [Subjects and Methods] Seventy-one community dwelling Japanese females aged 64-96 years (81.7 ± 8.0 years) participated in this study. The associations of the loco-check with thigh muscle mass measured by X-ray CT, physical performance, nutritional status, and quality of life (QOL) were investigated...
September 2017: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/28931716/field-swimming-behavior-in-largemouth-bass-deviates-from-predictions-based-on-economy-and-propulsive-efficiency
#8
Angela X Han, Caroline Berlin, David J Ellerby
Locomotion is energetically expensive. This may create selection pressures that favor economical locomotor strategies, such as the adoption of low-cost speeds and efficient propulsive movements. For swimming fish, the energy expended to travel a unit distance, or cost of transport (COT), has a U-shaped relationship to speed. The relationship between propulsive kinematics and speed, summarized by the Strouhal number (St=fA/U, where f is tail beat frequency, A is tail tip amplitude in m and U is swimming speed in m s(-1)), allows for maximal propulsive efficiency where 0...
September 15, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/28931155/host-recognition-responses-of-western-family-chrysomelidae-corn-rootworm-larvae-to-rna-interference-and-bt-corn
#9
Sarah N Zukoff, Anthony L Zukoff
Western corn rootworm Diabrotica virgifera virgifera LeConte is an important pest of corn whose larvae exhibit particular quantifiable patterns of locomotion after exposure to, and removal from, host roots and nonhost roots. Using EthoVision software, the behavior and locomotion of the western corn rootworm larvae was analyzed to determine the level of host recognition to germinated roots of differing corn hybrids containing either rootworm targeted Bt genes, RNA interference (RNAi) technology, the stack of both Bt and RNAi, or the isoline of these...
January 1, 2017: Journal of Insect Science
https://www.readbyqxmd.com/read/28930977/fourier-based-diffraction-analysis-of-live-caenorhabditis-elegans
#10
Jenny Magnes, Harold M Hastings, Kathleen M Raley-Susman, Clara Alivisatos, Adam Warner, Miranda Hulsey-Vincent
This manuscript describes how to classify nematodes using temporal far-field diffraction signatures. A single C. elegans is suspended in a water column inside an optical cuvette. A 632 nm continuous wave HeNe laser is directed through the cuvette using front surface mirrors. A significant distance of at least 20-30 cm traveled after the light passes through the cuvette ensures a useful far-field (Fraunhofer) diffraction pattern. The diffraction pattern changes in real time as the nematode swims within the laser beam...
September 13, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28930338/biomedical-nanomotors-efficient-glucose-mediated-insulin-release
#11
Paula Díez, Berta Esteban-Fernández de Ávila, Doris E Ramírez-Herrera, Reynaldo Villalonga, Joseph Wang
We report herein the design of an autonomous glucose-responsive smart nanomachine for insulin (In) delivery based on ultrasound (US)-propelled nanomotors combined with an enzyme-based sensing-effector unit. Gold nanowire (AuNW) motors have been coupled with a mesoporous silica (MS) segment, which was gated with pH-responsive phenylboronic acid (PBA)-glucose oxidase (GOx) supramolecular nanovalves responsible for the insulin release. Glucose-induced protonation of the PBA groups triggers the opening of the pH-driven gate and uncapping of the insulin-loaded nanovalves...
September 20, 2017: Nanoscale
https://www.readbyqxmd.com/read/28929440/the-influence-of-visual-flow-and-perceptual-load-on-locomotion-speed
#12
Casimir J H Ludwig, Nicholas Alexander, Kate L Howard, Alicja A Jedrzejewska, Isha Mundkur, David Redmill
Visual flow is used to perceive and regulate movement speed during locomotion. We assessed the extent to which variation in flow from the ground plane, arising from static visual textures, influences locomotion speed under conditions of concurrent perceptual load. In two experiments, participants walked over a 12-m projected walkway that consisted of stripes that were oriented orthogonal to the walking direction. In the critical conditions, the frequency of the stripes increased or decreased. We observed small, but consistent effects on walking speed, so that participants were walking slower when the frequency increased compared to when the frequency decreased...
September 19, 2017: Attention, Perception & Psychophysics
https://www.readbyqxmd.com/read/28928650/locomotor-sub-functions-for-control-of-assistive-wearable-robots
#13
Maziar A Sharbafi, Andre Seyfarth, Guoping Zhao
A primary goal of comparative biomechanics is to understand the fundamental physics of locomotion within an evolutionary context. Such an understanding of legged locomotion results in a transition from copying nature to borrowing strategies for interacting with the physical world regarding design and control of bio-inspired legged robots or robotic assistive devices. Inspired from nature, legged locomotion can be composed of three locomotor sub-functions, which are intrinsically interrelated: Stance: redirecting the center of mass by exerting forces on the ground...
2017: Frontiers in Neurorobotics
https://www.readbyqxmd.com/read/28927908/the-impact-of-the-standard-american-diet-in-rats-effects-on-behavior-physiology-and-recovery-from-inflammatory-injury
#14
Stacie K Totsch, Tammie L Quinn, Larissa J Strath, Laura J McMeekin, Rita M Cowell, Barbara A Gower, Robert E Sorge
BACKGROUND AND AIMS: Obesity is a significant health concern in the Western world and the presence of comorbid conditions suggests an interaction. The overlapping distributions of chronic pain populations and obesity suggests that an interaction may exist. Poor quality diet (high carbohydrates, saturated fats, omega-6 polyunsaturated fatty acids) can lead to increased adiposity which can activate immune cells independent of the activating effect of the diet components themselves. This dual action can contribute to chronic inflammation that may alter susceptibility to chronic pain and prolong recovery from injury...
September 16, 2017: Scandinavian Journal of Pain
https://www.readbyqxmd.com/read/28927741/associations-of-the-step-up-test-and-lower-limb-dysfunction-a-post-hoc-analysis-of-a-prospective-cohort-study
#15
Kiyoshi Kita, Yoshihiro Fukumoto, Yukihide Nishimura, Akihiko Kasuya, Tsuyoshi Asai
BACKGROUND: Step-up ability is considered to be associated with lower limb dysfunction. The objective of this research was to assess the height of the tallest step that could be mounted and to investigate its association with lower limb dysfunction. METHODS: We previously conducted a two-year follow-up prospective cohort study. The study subjects were 119 patients receiving physiotherapy or exercise therapy at an orthopedic surgery clinic. The items evaluated were step-up ability (maximum step height), the timed up and go test, one-leg standing time and the 5-question Geriatric Locomotive Function Scale...
September 16, 2017: Journal of Orthopaedic Science: Official Journal of the Japanese Orthopaedic Association
https://www.readbyqxmd.com/read/28927446/neurochemical-and-behavioral-characterization-of-neuronal-glutamate-transporter-eaat3-heterozygous-mice
#16
Luis F González, Francisca Henríquez-Belmar, Claudia Delgado-Acevedo, Marisol Cisternas-Olmedo, Gloria Arriagada, Ramón Sotomayor-Zárate, Dennis L Murphy, Pablo R Moya
BACKGROUND: Obsessive-compulsive disorder (OCD) is a severe neuropsychiatric condition affecting 1-3% of the worldwide population. OCD has a strong genetic component, and the SLC1A1 gene that encodes neuronal glutamate transporter EAAT3 is a strong candidate for this disorder. To evaluate the impact of reduced EAAT3 expression in vivo, we studied male EAAT3 heterozygous and wild-type littermate mice using a battery of behavioral paradigms relevant to anxiety (open field test, elevated plus maze) and compulsivity (marble burying), as well as locomotor activity induced by amphetamine...
September 19, 2017: Biological Research
https://www.readbyqxmd.com/read/28925568/the-fibular-meniscus-of-the-kangaroo-as-an-adaptation-against-external-tibial-rotation-during-saltatorial-locomotion
#17
Adrian C Miller, Martin A Cake, Natalie M Warburton
The kangaroo knee is, as in other species, a complex diarthrodial joint dependent on interacting osseous, cartilaginous and ligamentous components for its stability. While principal load bearing occurs through the femorotibial articulation, additional lateral articulations involving the fibula and lateral fabella also contribute to the functional arrangement. Several fibrocartilage and ligamentous structures in this joint remain unexplained or have been misunderstood in previous studies. In this study, we review the existing literature on the structure of the kangaroo 'knee' before providing a new description of the gross anatomical and histological structures...
September 19, 2017: Journal of Anatomy
https://www.readbyqxmd.com/read/28924563/functional-near-infrared-spectroscopy-in-movement-science-a-systematic-review-on-cortical-activity-in-postural-and-walking-tasks
#18
REVIEW
Fabian Herold, Patrick Wiegel, Felix Scholkmann, Angelina Thiers, Dennis Hamacher, Lutz Schega
Safe locomotion is a crucial aspect of human daily living that requires well-functioning motor control processes. The human neuromotor control of daily activities such as walking relies on the complex interaction of subcortical and cortical areas. Technical developments in neuroimaging systems allow the quantification of cortical activation during the execution of motor tasks. Functional near-infrared spectroscopy (fNIRS) seems to be a promising tool to monitor motor control processes in cortical areas in freely moving subjects...
October 2017: Neurophotonics
https://www.readbyqxmd.com/read/28924005/nigral-glutamatergic-neurons-control-the-speed-of-locomotion
#19
Dimitri Ryczko, Swantje Grätsch, Laura Schläger, Avo Keuyalian, Zakaria Boukhatem, Claudia Garcia, François Auclair, Ansgar Büschges, Réjean Dubuc
The Mesencephalic Locomotor Region (MLR) plays a crucial role in locomotor control. In vertebrates, stimulation of the MLR at increasing intensities elicits locomotion of growing speed. This effect has been presumed to result from higher brain inputs activating the MLR like a dimmer switch. Here, we show in lampreys (Petromyzon marinus) of either sex that incremental stimulation of a region homologous to the mammalian substantia nigra pars compacta (SNc) evokes increasing activation of MLR cells with a graded increase in the frequency of locomotor movements...
September 18, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28923167/cyclic-bouts-of-extreme-bradycardia-counteract-the-high-metabolism-of-frugivorous-bats
#20
M Teague O'Mara, Martin Wikelski, Christian C Voigt, Andries Ter Maat, Henry S Pollock, Gary Burness, Lanna M Desantis, Dina Kn Dechmann
Active flight requires the ability to efficiently fuel bursts of costly locomotion while maximizing energy conservation during non-flying times. We took a multi-faceted approach to estimate how fruit-eating bats (Uroderma bilobatum) manage a high-energy lifestyle fueled primarily by fig juice. Miniaturized heart rate telemetry shows that they use a novel, cyclic, bradycardic state that reduces daily energetic expenditure by 10% and counteracts heart rates as high as 900 bpm during flight. Uroderma bilobatum support flight with some of the fastest metabolic incorporation rates and dynamic circulating cortisol in vertebrates...
September 19, 2017: ELife
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