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https://www.readbyqxmd.com/read/28817153/a-comparative-study-on-the-cardiac-morphology-and-vertical-jump-height-of-adolescent-black-south-african-male-and-female-amateur-competitive-footballers
#1
Philippe Jean-Luc Gradidge, Demitri Constantinou
OBJECTIVE: The aim of this comparative study was to determine the gender differences in cardiac morphology and performance in adolescent black South African footballers. METHODS: Anthropometry, electrocardiography and echocardiography data were measured in 167 (85 males and 82 females) adolescent black South African footballers (mean age: 14.8 ± 1.3 years). Vertical jump height was used as a performance measure of explosive lower-limb power. RESULTS: The males had less body fat compared with the females (12...
August 15, 2017: Cardiovascular Journal of Africa
https://www.readbyqxmd.com/read/28816944/acute-changes-in-neuromuscular-activity-in-vertical-jump-and-flexibility-after-exposure-to-whole-body-vibration
#2
Giuseppe Annino, Ferdinando Iellamo, Francesco Palazzo, Augusto Fusco, Mauro Lombardo, Francesca Campoli, Elvira Padua
This study was aimed to investigate the neuromuscular activity after 10 minutes of exposure to a whole body vibration (WBV) session.Twenty male young adults (24.8 ± 2.5 year olds) were randomized and divided into 2 groups: the vibration group (VG) was exposed to 10 minutes of WBV at 35 Hz; performed 10 minutes of WBV at 35 Hz (displacement = 5 mm; magnitude = 5 g); the nonvibrated group (NVG) was the placebo group that maintained the same position on the plate but without exposure to any type of vibration...
August 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28816503/pubertal-development-of-body-size-and-soccer-specific-functional-capacities-in-adolescent-players
#3
Humberto Moreira Carvalho, José A Lekue, Susana M Gil, Iraia Bidaurrazaga-Letona
Pubertal growth in body size and functional capacities were examined in adolescent soccer players (n = 33). The average age at baseline was 10.9 (9.8-11.8 years). Peak height velocity (PHV) and growth curves for body mass and functional performance (countermovement jump, 15-m sprint, agility and Yo-Yo intermittent recovery test - level 1) were determined with Bayesian multilevel models. Estimates for PHV and age at PHV were 8.1 cm/year (95% credible interval: 4.2-18.5 cm/year) and 12.9 years (95% credible interval: 11...
August 17, 2017: Research in Sports Medicine
https://www.readbyqxmd.com/read/28815702/a-multicentre-study-of-long-term-follow-up-and-owner-satisfaction-following-enucleation-in-horses
#4
K Wright, J L Ireland, D I Rendle
BACKGROUND: Horses are reported to return to a variety of disciplines following unilateral enucleation; however, owners of horses with ocular disease are frequently reluctant to consider the procedure. There is little published information investigating owners' attitudes towards, and satisfaction following, enucleation. OBJECTIVES: To investigate the hypotheses: 1. horses return to their previous level of work following unilateral enucleation and, 2. their owners are satisfied with the post-operative outcome...
August 16, 2017: Equine Veterinary Journal
https://www.readbyqxmd.com/read/28815505/preparing-mate-paired-illumina-libraries-using-cre-recombinase
#5
Ze Peng, Nandita Nath, Zhiying Zhao, Jeff L Froula, Jan-Fang Cheng, Feng Chen
Large insert mate pair reads have been used in de novo assembly and discovery of structural variants. We developed a new approach, Cre-LoxP inverse PCR paired end (CLIP-PE), which exploits the advantages of (1) Cre-LoxP recombination system to efficiently circularize large DNA fragments, (2) inverse PCR to enrich for the desired products that contain both ends of the large DNA fragments, and (3) use of restriction enzymes to introduce a recognizable junction site between ligated fragment ends. We have successfully created CLIP-PE libraries of up to 22 kb jumping pairs and demonstrated their ability to improve genome assemblies...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28810755/anomalous-critical-slowdown-at-a-first-order-phase-transition-in-single-polymer-chains
#6
Shuangshuang Zhang, Shuanhu Qi, Leonid I Klushin, Alexander M Skvortsov, Dadong Yan, Friederike Schmid
Using Brownian dynamics, we study the dynamical behavior of a polymer grafted onto an adhesive surface close to the mechanically induced adsorption-stretching transition. Even though the transition is first order (in the infinite chain length limit, the stretching degree of the chain jumps discontinuously), the characteristic relaxation time is found to grow according to a power law as the transition point is approached. We present a dynamic effective interface model which reproduces these observations and provides an excellent quantitative description of the simulation data...
August 14, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28810731/the-impact-of-hydrogen-bonding-on-the-dynamics-and-structure-of-protic-ionic-liquid-water-binary-mixtures
#7
Heather E Bailey, Yong-Lei Wang, Michael D Fayer
The orientational dynamics and microscopic liquid structure of a protic ionic liquid, 1-ethylimidazolium bis(trifluoromethylsulfonyl)imide (EhimNTf2), and its aprotic analogue, 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (EmimNTf2), were studied at various water concentrations using optical heterodyne-detected optical Kerr Effect (OHD-OKE) spectroscopy, linear infrared spectroscopy, and atomistic simulations. The OHD-OKE experiments essentially measure the orientational relaxation of the Ehim+ and Emim+ cations...
August 15, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28809806/a-continuum-damage-mechanics-model-for-the-static-and-cyclic-fatigue-of-cellular-composites
#8
Sergej Diel, Otto Huber
The fatigue behavior of a cellular composite with an epoxy matrix and glass foam granules is analyzed and modeled by means of continuum damage mechanics. The investigated cellular composite is a particular type of composite foam, and is very similar to syntactic foams. In contrast to conventional syntactic foams constituted by hollow spherical particles (balloons), cellular glass, mineral, or metal place holders are combined with the matrix material (metal or polymer) in the case of cellular composites. A microstructural investigation of the damage behavior is performed using scanning electron microscopy...
August 15, 2017: Materials
https://www.readbyqxmd.com/read/28809537/confined-water-structure-dynamics-and-thermodynamics
#9
Sudip Chakraborty, Hemant Kumar, Chandan Dasgupta, Prabal K Maiti
Understanding the properties of strongly confined water is important for a variety of applications such as fast flow and desalination devices, voltage generation, flow sensing, and nanofluidics. Confined water also plays an important role in many biological processes such as flow through ion channels. Water in the bulk exhibits many unusual properties that arise primarily from the presence of a network of hydrogen bonds. Strong confinement in structures such as carbon nanotubes (CNTs) substantially modifies the structural, thermodynamic, and dynamic (both translational and orientational) properties of water by changing the structure of the hydrogen bond network...
August 15, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28808227/exactly-solvable-model-for-a-velocity-jump-observed-in-crack-propagation-in-viscoelastic-solids
#10
Naoyuki Sakumichi, Ko Okumura
Needs to impart appropriate elasticity and high toughness to viscoelastic polymer materials are ubiquitous in industries such as concerning automobiles and medical devices. One of the major problems to overcome for toughening is catastrophic failure linked to a velocity jump, i.e., a sharp transition in the velocity of crack propagation occurred in a narrow range of the applied load. However, its physical origin has remained an enigma despite previous studies over 60 years. Here, we propose an exactly solvable model that exhibits the velocity jump incorporating linear viscoelasticity with a cutoff length for a continuum description...
August 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28808019/next-step-in-the-ongoing-arms-race-between-myxoma-virus-and-wild-rabbits-in-australia-is-a-novel-disease-phenotype
#11
Peter J Kerr, Isabella M Cattadori, June Liu, Derek G Sim, Jeff W Dodds, Jason W Brooks, Mary J Kennett, Edward C Holmes, Andrew F Read
In host-pathogen arms races, increases in host resistance prompt counteradaptation by pathogens, but the nature of that counteradaptation is seldom directly observed outside of laboratory models. The best-documented field example is the coevolution of myxoma virus (MYXV) in European rabbits. To understand how MYXV in Australia has continued to evolve in wild rabbits under intense selection for genetic resistance to myxomatosis, we compared the phenotypes of the progenitor MYXV and viral isolates from the 1950s and the 1990s in laboratory rabbits with no resistance...
August 14, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28806086/role-of-electrostatics-in-protein-rna-binding-the-global-vs-the-local-energy-landscape
#12
Zhaleh Ghaemi, Irisbel Guzman, David Gnutt, Zaida Luthey-Schulten, Martin Gruebele
U1A protein - stem loop 2 RNA association is a basic step in the assembly of the spliceosomal U1 small nuclear ribonucleoprotein. Long-range electrostatic interactions due to the positive charge of U1A are thought to provide high binding affinity for the negatively charged RNA. Short range interactions, such as hydrogen bonds and contacts between RNA bases and protein side chains, favor a specific binding site. Here, we propose that electrostatic interactions are as important as local contacts in biasing the protein-RNA energy landscape towards a specific binding site...
August 14, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28805506/kinematic-and-neuromuscular-relationships-between-lower-extremity-clinical-movement-assessments
#13
Timothy C Mauntel, Tyler R Cram, Barnett S Frank, Rebecca L Begalle, Marc F Norcross, J Troy Blackburn, Darin A Padua
Lower extremity injuries have immediate and long-term consequences. Lower extremity movement assessments can assist with identifying individuals at greater injury risk and guide injury prevention interventions. Movement assessments identify similar movement characteristics and evidence suggests large magnitude kinematic relationships exist between movement patterns observed across assessments; however, the magnitude of the relationships for electromyographic (EMG) measures across movement assessments remains largely unknown...
August 14, 2017: Sports Biomechanics
https://www.readbyqxmd.com/read/28803215/structural-tribological-and-mechanical-properties-of-the-hind-leg-joint-of-a-jumping-insect-using-katydids-to-inform-bioinspired-lubrication-systems
#14
Jun Kyun Oh, Spencer T Behmer, Richelle Marquess, Cengiz Yegin, Ethan A Scholar, Mustafa Akbulut
This study investigates the structural properties of the hind leg femur-tibia joint in adult katydids (Orthoptera: Tettigoniidae), including its tribological and mechanical properties. It is of particular interest because the orthopteran (e.g., grasshoppers, crickets, and katydids) hind leg is highly specialized for jumping. We show that the katydid hind leg femur-tibia joint had unique surfaces and textures, with a friction coefficient (μ) at its coupling surface of 0.053 ± 0.001. Importantly, the sheared surfaces at this joint showed no sign of wear or damage, even though it had undergone thousands of external shearing cycles...
August 9, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28802644/rapid-characterization-of-the-cho-platform-cell-line-and-identification-of-pseudo-attp-sites-for-phic31-integrase
#15
Narges Damavandi, Mozhgan Raigani, Atefeh Joudaki, Fatemeh Davami, Sirous Zeinali
The Chinese Hamster Ovary (CHO) cell lines, applicable to post-translational modifications, are preferred systems for biopharmaceutical protein production. In this study, by using the Jump-In™ TI™ technology which employs PhiC31 and R4 bacteriophage recombinases, a platform CHO-K1 cell line containing a R4-attP site was generated. Here, a combination of Quantitative Fluorescent-Polymerase Chain Reaction (QF-PCR) and semi-random, two-step PCR (ST-PCR), was performed to feature the platform cell clones. Our results show that QF-PCR and ST-PCR, can be utilized for efficient and accelerated cell line characterization...
August 9, 2017: Protein Expression and Purification
https://www.readbyqxmd.com/read/28802221/in-vivo-mechanical-behaviour-of-the-anterior-cruciate-ligament-a-study-of-six-daily-and-high-impact-activities
#16
Elisa Roldán, Neil D Reeves, Glen Cooper, Kirstie Andrews
The anterior cruciate ligament (ACL) plays a key role in the stability of the knee joint restricting the rotation and anterior tibial translation. However, there is a lack of knowledge of the in vivo ACL mechanical behaviour during high impact manoeuvres. The motion of 12 young participants with healthy knees was captured while they performed the following activities: walking, running, cross-over cutting, sidestep cutting, jumping and jumping with one leg. The in vivo ACL length and strain were estimated using experimental kinematic data and three degree of freedom (DOF) knee model...
August 1, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28801751/activity-demands-during-multi-directional-team-sports-a-systematic-review
#17
REVIEW
Jeffrey B Taylor, Alexis A Wright, Steven L Dischiavi, M Allison Townsend, Adam R Marmon
BACKGROUND: Late-stage rehabilitation programs often incorporate 'sport-specific' demands, but may not optimally simulate the in-game volume or intensity of such activities as sprinting, cutting, jumping, and lateral movement. OBJECTIVE: The aim of this review was to characterize, quantify, and compare straight-line running and multi-directional demands during sport competition. DATA SOURCES: A systematic review of PubMed, CINAHL, SPORTDiscus, and Cochrane Central Register of Controlled Trials databases was conducted...
August 12, 2017: Sports Medicine
https://www.readbyqxmd.com/read/28799405/the-spatiotemporal-master-equation-approximation-of-reaction-diffusion-dynamics-via-markov-state-modeling
#18
Stefanie Winkelmann, Christof Schütte
Accurate modeling and numerical simulation of reaction kinetics is a topic of steady interest. We consider the spatiotemporal chemical master equation (ST-CME) as a model for stochastic reaction-diffusion systems that exhibit properties of metastability. The space of motion is decomposed into metastable compartments, and diffusive motion is approximated by jumps between these compartments. Treating these jumps as first-order reactions, simulation of the resulting stochastic system is possible by the Gillespie method...
December 7, 2016: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28799161/performance-factors-in-a-mountain-ultramarathon
#19
Pascal Balducci, Michel Clémençon, Robin Trama, Yoann Blache, Christophe Hautier
This study aimed to determine mountain ultra-marathon (MUM) performance factors in a large group of endurance mountain runners. Maximal aerobic speed (MAS) was assessed one week prior to the MUM. The level and graded (10%) energy cost of running, stiffness, knee extensors force (KEf), and jump height on a counter movement jump (CMJ) were measured in 24 male ultra runners before (pre) and immediately after (post) the Interlacs Trail (75 km and 3 930/3 700 m d+/d-). Performance time was correlated with MAS (r=- 0...
August 10, 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28799030/transfer-of-improved-movement-technique-after-receiving-verbal-external-focus-and-video-instruction
#20
Anne Benjaminse, Wouter Welling, Bert Otten, Alli Gokeler
PURPOSE: It is unknown how movement patterns that are learned carry over to the field. The objective was to determine whether training during a jump-landing task would transfer to lower extremity kinematics and kinetics during sidestep cutting. METHODS: Forty healthy athletes were assigned to the verbal internal focus (IF, n = 10), verbal external focus (EF, n = 10), video (VI, n = 10) or control (CTRL, n = 10) group. A jump-landing task was performed as baseline followed by training blocks (TR1 and TR2) and a post-test...
August 10, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
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