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https://www.readbyqxmd.com/read/28738168/role-of-age-and-injury-mechanism-in-cervical-spine-injury-tolerance-under-head-contact-loading
#1
Narayan Yoganandan, Sajal Chirvi, Liming Voo, Frank A Pintar, Anjishnu Banerjee
OBJECTIVE: To determine the influence of age on cervical spine tolerance to injury from head contact loading using survival analysis. METHODS: This study analyzed data from previously conducted experiments using Post Mortem Human Subject specimens (PMHS). Group A tests used the upright intact head-cervical column experimental model. The inferior end of the specimen was fixed, head was balanced by a mechanical system, and natural lordosis was removed. Specimens were placed on a testing device via a load cell...
July 24, 2017: Traffic Injury Prevention
https://www.readbyqxmd.com/read/28736791/control-of-standing-balance-at-leaning-postures-with-functional-neuromuscular-stimulation-following-spinal-cord-injury
#2
Musa L Audu, Brooke M Odle, Ronald J Triolo
This study systematically explored the potential of applying feedback control of functional neuromuscular stimulation (FNS) for stabilizing various erect and leaning standing postures after spinal cord injury (SCI). Perturbations ranging from 2 to 6% body weight were applied to two subjects with motor complete thoracic level SCI who were proficient at standing with implanted multichannel neural stimulators to activate the ankle, knee, hip and trunk muscles. The subjects stood with four different postures: erect, forward, forward-right and forward-left...
July 24, 2017: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/28736330/impaired-microglia-fractalkine-signaling-affects-stress-reaction-and-coping-style-in-mice
#3
Zsuzsanna Winkler, Dániel Kuti, Szilamér Ferenczi, Krisztina Gulyás, Ágnes Polyák, Krisztina J Kovács
Microglia, resident immune cells of the CNS are sensitive to various perturbations of the environment, such as stress exposure, and may be involved in translating these changes to behavior. Among the pathways mediating stress-related neuronal cues to microglia, the fractalkine-fractalkine receptor (CX3CR1) signaling plays a crucial role. Using mice, in which the CX3CR1 gene was deleted, we explored hormonal and behavioral responses to acute and chronic stress along with changes in hypothalamic microglia. CX3CR1(-/-) animals display active escape in forced swim- and tail suspension tests, exaggerated neuronal activation in the hypothalamic paraventricular nucleus and increased corticosterone release in response to restraint...
July 20, 2017: Behavioural Brain Research
https://www.readbyqxmd.com/read/28735884/from-drop-shape-analysis-to-stress-fitting-elastometry
#4
REVIEW
Mathias Nagel, Theo A Tervoort, Jan Vermant
Drop-shape analysis using pendant or sessile drops is a well-established experimental technique for measuring the interfacial or surface tension, and changes thereof. The method relies on deforming a drop by either gravity or buoyancy and fitting the Young-Laplace equation to the drop shape. Alternatively one can prescribe the shape and measure the pressure inside the drop or bubble using pressure tensiometry. However, when an interface with a complex microstructure is present, extra and anisotropic interfacial stresses may develop due to lateral interactions between the surface-active moieties, leading to deviations of the drop shape or even a wrinkling of the interface...
July 13, 2017: Advances in Colloid and Interface Science
https://www.readbyqxmd.com/read/28731702/drude-polarizable-force-field-for-molecular-dynamics-simulations-of-saturated-and-unsaturated-zwitterionic-lipids
#5
Hui Li, Janamejaya Chowdhary, Lei Huang, Xibing He, Alexander D MacKerell, Benoît Roux
Additive force fields are designed to account for induced electronic polarization in a mean-field average way using effective empirical fixed charges. The limitation of this approximation is cause for serious concerns, particularly in the case of lipid membranes, where the molecular environment undergoes dramatic variations over microscopic length scales. A polarizable force field based on the classical Drude oscillator offers a practical and computationally efficient framework for an improved representation of electrostatic interactions in molecular simulations...
July 21, 2017: Journal of Chemical Theory and Computation
https://www.readbyqxmd.com/read/28730881/comparison-of-jump-landing-protocols-with-biodex-balance-system-as-measures-of-dynamic-postural-stability-in-athletes
#6
Zarko Krkeljas
The objective of the study was to determine whether a relationship exists between the two common methods for assessing postural stability in athletes: the time-to-stabilisation (TTS) via force-plate and the Biodex Balance System (BBS). The conditions under which these measurements assess dynamic postural control may not provide sufficient feedback to practitioners. Fourty-four amateur soccer players with no history of musculoskeletal disorders volunteered for the study. Pearson correlation was used to compare the anterior-posterior (AP), medio-lateral (ML), and the overall stability indexes measured by BBS, with the corresponding parameters of TTS assessed via force plate...
July 21, 2017: Sports Biomechanics
https://www.readbyqxmd.com/read/28728380/effects-of-different-space-allowances-on-growth-performance-blood-profile-and-pork-quality-in-a-grow-to-finish-production-system
#7
J C Jang, X H Jin, J S Hong, Y Y Kim
Objective: This experiment was conducted to evaluate the optimal space allowance on growth performance, blood profile and pork quality of growing-finishing pigs. Methods: A total of ninety crossbred pigs ([Yorkshire x Landrace] x Duroc, 30.25 ± 1.13 kg) were allocated into three treatments (0.96: four pigs / pen, 0.96 m2/pig; 0.80: five pigs / pen, 0.80 m2/pig; 0.69: six pigs / pen, 0.69 m2/pig) in a randomized complete block (RCB) design. Pigs were housed in balanced sex and had free access to feed in all phases for 14 weeks (growing phase I, growing phase II, finishing phase I and finishing phase II)...
June 26, 2017: Asian-Australasian Journal of Animal Sciences
https://www.readbyqxmd.com/read/28728029/peroxidase-mimetic-activity-of-fe3o4-nanoparticle-prepared-based-on-magnetic-hydrogels-for-hydrogen-peroxide-and-glucose-detection
#8
Shasha Song, Yang Liu, Aixin Song, Zengdian Zhao, Hongsheng Lu, Jingcheng Hao
Stimuli-response magnetic hydrogels were prepared in the mixtures of magnetic surfactants, (CnTAFB(C), n=12, 14, 16), and chiral amphiphiles, sodium cholate (SC). The gelation behavior of CnTAFB(C)/SC were studied in detail. The results proved that the hydrophobicity of surfactants and the hydration radius (Rh) of anions played a vital role in the gelation process. The microstructure of the hydrogels were determined to be three-dimensional network of fibrous aggregates. The formation of the hydrogel fibrils was considered to be mainly driven by a delicate balance of multiple non-covalent interactions including hydrophobic interaction, electrostatic interaction, hydrogen bonding, van der Waals force, and the steric effect of SC molecule...
July 10, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28725997/mitotic-spindle-kinetochore-fibers-hold-on-tight-to-interpolar-bundles
#9
REVIEW
Iva M Tolić
When a cell starts to divide, it forms a spindle, a micro-machine made of microtubules, which separates the duplicated chromosomes. The attachment of microtubules to chromosomes is mediated by kinetochores, protein complexes on the chromosome. Spindle microtubules can be divided into three major classes: kinetochore microtubules, which form k-fibers ending at the kinetochore; interpolar microtubules, which extend from the opposite sides of the spindle and interact in the middle; and astral microtubules, which extend towards the cell cortex...
July 19, 2017: European Biophysics Journal: EBJ
https://www.readbyqxmd.com/read/28722804/balancing-life-and-work-by-unbending-gender-early-american-women-psychologists-struggles-and-contributions
#10
Elizabeth Johnston, Ann Johnson
Women's participation in the work force shifted markedly throughout the twentieth century, from a low of 21 percent in 1900 to 59 percent in 1998. The influx of women into market work, particularly married women with children, put pressure on the ideology of domesticity: an ideal male worker in the outside market married to a woman taking care of children and home (Williams, 2000). Here, we examine some moments in the early-to-mid-twentieth century when female psychologists contested established norms of life-work balance premised on domesticity...
July 2017: Journal of the History of the Behavioral Sciences
https://www.readbyqxmd.com/read/28721495/diversity-and-survival-of-artificial-lifeforms-under-sedimentation-and-random-motion
#11
Nicolas Glade, Olivier Bastien, Pascal Ballet
Cellular automata are often used to explore the numerous possible scenarios of what could have occurred at the origins of life and before, during the prebiotic ages, when very simple molecules started to assemble and organise into larger catalytic or informative structures, or to simulate ecosystems. Artificial self-maintained spatial structures emerge in cellular automata and are often used to represent molecules or living organisms. They converge generally towards homogeneous stationary soups of still-life creatures...
July 18, 2017: Theory in Biosciences, Theorie in Den Biowissenschaften
https://www.readbyqxmd.com/read/28719744/high-resolution-insights-into-the-stepwise-self-assembly-of-nanofiber-from-bioactive-peptides
#12
Fude Sun, Long Chen, Xiufang Ding, Lida Xu, Xirui Zhou, Peng Wei, Jun-Feng Liang, Shi-Zhong Luo
Peptide self-assembly has a profound biological significance since self-assembled bioactive peptides are gifted with improved bioactivity as well as life-span. In this study, peptide self-assembly was investigated using a therapeutic peptide, PTP-7S (EENFLGALFKALSKLL). Combining experiments of atomic force microscopy (AFM), circular dichroism (CD) and 8-anilino-1-naphthalenesulfonic acid (ANS) fluorescence spectra, PTP-7S showing α-helix was found self-assembling into nanofibers in solution. Relying on the coarse-grained (CG) dynamic simulations, the self-assembling of PTP-7S was revealed as a stepwise process that peptide monomers first clustered into peptide-assembling units (PUs) with charged surface, and then the PUs integrated together to construct nano-fibril aggregates...
July 18, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28716355/study-of-relative-response-factors-and-mass-balance-in-forced-degradation-studies-with-liquid-chromatography-photo-diode-array-detector-evaporative-light-scattering-detector-mass-spectrometry-system
#13
Paula Hong, Aaron D Phoebe, Michael D Jones
A case study was performed using photodiode array detection (PDA) in combination with evaporative light scattering (ELS) detection and mass spectrometry (MS) to assess both mass balance and the relative response factors (RRFs) in the forced degradation studies of the drug substance, glimepiride. The RRF value, which is the ratio of the response factor of the impurity to that of the API, was first determined using calibration curves of standards. This conventional technique was compared to a second, multi-detection technique, which used the PDA and ELS detectors to determine both the ultraviolet (UV) peak area and the concentration (based on measurement by ELS) in a single analysis...
July 4, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28716075/the-role-of-tumour-heterogeneity-and-clonal-cooperativity-in-metastasis-immune-evasion-and-clinical-outcome
#14
REVIEW
Deborah R Caswell, Charles Swanton
BACKGROUND: The advent of rapid and inexpensive sequencing technology allows scientists to decipher heterogeneity within primary tumours, between primary and metastatic sites, and between metastases. Charting the evolutionary history of individual tumours has revealed drivers of tumour heterogeneity and highlighted its impact on therapeutic outcomes. DISCUSSION: Scientists are using improved sequencing technologies to characterise and address the challenge of tumour heterogeneity, which is a major cause of resistance to therapy and relapse...
July 18, 2017: BMC Medicine
https://www.readbyqxmd.com/read/28716003/eccentric-versus-traditional-resistance-exercise-for-older-adult-fallers-in-the-community-a-randomized-trial-within-a-multi-component-fall-reduction-program
#15
Paul LaStayo, Robin Marcus, Leland Dibble, Bob Wong, Ginette Pepper
BACKGROUND: Addressing muscle deficits within a multi-component exercise fall reduction program is a priority, especially for the highest risk older adults, i.e., those who have fallen previously. Eccentric resistance exercise with its high-force producing potential, at a low energetic cost, may be ideally-suited to address muscle impairments in this population. The purpose of this study was to compare the effects of resistance exercise via negative, eccentrically-induced, work (RENEW) versus traditional (TRAD) resistance exercise on mobility, balance confidence, muscle power and cross sectional area, as well as the number of days high fall risk older adults survived without a fall event over a 1 year period...
July 17, 2017: BMC Geriatrics
https://www.readbyqxmd.com/read/28714837/validating-center-of-pressure-balance-measurements-using-the-matscan%C3%A2-pressure-mat
#16
John Goetschius, Mark A Feger, Jay Hertel, Joseph M Hart
CONTEXT: Measurements of center of pressure (COP) excursions during balance are common practice in clinical and research settings to evaluate adaptations in postural control due to pathological or environmental conditions. Traditionally measured using laboratory force-plates, pressure-mat devices may be a suitable option for clinicians and scientist to measure COP excursions. OBJECTIVE: Compare COP measures and changes during balance between MatScan® pressure-mat and force-plate...
July 17, 2017: Journal of Sport Rehabilitation
https://www.readbyqxmd.com/read/28714771/acute-effect-of-static-stretching-on-lower-limb-movement-performance-by-using-stabl-virtual-reality-system
#17
Mariam A Ameer, Qassim I Muaidi
CONTEXT: The effect of acute static stretch (ASS) on the lower limb RT has been recently questioned to decrease the risk of falling and injuries in situations requiring a rapid reaction, as in the cases of balance disturbance. OBJECTIVE: The main purpose of this study was to detect the effect of ASS on the lower limb RT by using virtual reality device. DESIGN: Two Group Control Group design. SETTING: Research laboratory...
July 17, 2017: Journal of Sport Rehabilitation
https://www.readbyqxmd.com/read/28703891/duration-of-action-of-mepivacaine-and-lidocaine-in-equine-palmar-digital-perineural-blocks-in-an-experimental-lameness-model
#18
Mona Hoerdemann, Rachael L Smith, Giselle Hosgood
OBJECTIVE: To establish and compare the onset and duration of action of 2 local anesthetics based on objective lameness and skin sensitivity assessment. STUDY DESIGN: Interventional crossover experimental trial with balanced randomization. ANIMALS: Eight horses. METHODS: Reversible forelimb lameness was induced in 8 horses. A palmar digital nerve block (PDNB) was applied with mepivacaine or lidocaine (both 2%). Quantitative lameness and skin sensitivity data were collected with an inertial sensor system and a force gauge, respectively...
July 13, 2017: Veterinary Surgery: VS
https://www.readbyqxmd.com/read/28700920/modeling-endoplasmic-reticulum-network-maintenance-in-a-plant-cell
#19
Congping Lin, Rhiannon R White, Imogen Sparkes, Peter Ashwin
The endoplasmic reticulum (ER) in plant cells forms a highly dynamic network of complex geometry. ER network morphology and dynamics are influenced by a number of biophysical processes, including filament/tubule tension, viscous forces, Brownian diffusion, and interactions with many other organelles and cytoskeletal elements. Previous studies have indicated that ER networks can be thought of as constrained minimal-length networks acted on by a variety of forces that perturb and/or remodel the network. Here, we study two specific biophysical processes involved in remodeling...
July 11, 2017: Biophysical Journal
https://www.readbyqxmd.com/read/28698803/sports-activities-after-total-hip-arthroplasty
#20
Martin Krismer
Performing sports after total hip arthroplasty (THA) may be associated with a risk of Trauma (fracture and dislocation)Shorter implant survivalThere is no proof that trauma occurs more often than in healthy individuals, but sequelae may be more severe.Shorter implant survival due to repetitive high contact forces is a fact, due to increased wear. The 15 year survival in highly active patients seems to be around 80%.Surgeons can address the needs of active patients by using bearings with low wear rates, and femoral heads up to 36 mm in diameter...
May 2017: EFORT open reviews
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