keyword
MENU ▼
Read by QxMD icon Read
search

Gravity

keyword
https://www.readbyqxmd.com/read/28535150/a-new-scenario-for-gravity-detection-in-plants-the-position-sensor-hypothesis
#1
O Pouliquen, Y Forterre, A Bérut, H Chauvet, F Bizet, V Legué, B Moulia
The detection of gravity plays a fundamental role during the growth and evolution of plants. Although progress has been made in our understanding of the molecular, cellular and physical mechanisms involved in the gravity detection, a coherent scenario consistent with all the observations is still lacking. In this special issue article, we discuss recent experiments showing that the response to inclination of shoots is independent of the gravity intensity, meaning that the gravity sensor detects an inclination and not a force...
May 23, 2017: Physical Biology
https://www.readbyqxmd.com/read/28533993/bilateral-external-ventricular-drain-placement-and-intraventricular-irrigation-combined-with-concomitant-serial-prone-patient-positioning-a-novel-treatment-for-gravity-dependent-layering-in-bacterial-ventriculitis
#2
Andrew K Chan, Harjus S Birk, John K Yue, Ethan A Winkler, Michael W McDermott
A feared complication of ventricular access for drainage or shunting is ventriculitis. Early diagnosis and treatment is vital to prevent morbidity and mortality. Efficacy of directed antibiotic therapy in ventriculitis is limited by increasing multidrug resistant microorganisms and insufficient systemic antibiotic absorption into the cerebrospinal fluid. Treatment may involve intravenous and/or intrathecal antibiotics as well as external ventricular drainage. We present the first case report suggesting a potential role of a novel technique - direct ventricular catheter-mediated continuous saline irrigation and serial prone patient positioning - to treat a fulminant bacterial ventriculitis...
April 18, 2017: Curēus
https://www.readbyqxmd.com/read/28533085/return-to-drive-after-non-evolutive-brain-damage-french-recommendations
#3
REVIEW
Anne-Claire D'apolito, Jean-Luc Leguiet, Michel Enjalbert, Francis Lemoine, Jean-Michel Mazaux
Return to drive after brain damage is a crucial question either for patients than health professionals. The Société française de medicine physique et de réadaptation (SOFMER) and Comète France association developed recommandations for patient's identification, evaluation and accompaniment as part of their project to resume to drive. The place of rehabilitation process and patient's focus has been also discussed. AIMS: Using a literature review, the aim was to define clinical pathways to determine people who need a fitness to drive evaluation after a non-evolutive brain damage as well as the assessment process...
May 19, 2017: Annals of Physical and Rehabilitation Medicine
https://www.readbyqxmd.com/read/28532591/modeling-stability-analysis-and-computational-aspects-of-some-simplest-nonlinear-fuzzy-two-term-controllers-derived-via-center-of-area-gravity-defuzzification
#4
N K Arun, B M Mohan
The mathematical models reported in the literature so far have been found using Center of Sums (CoS) defuzzification method only. It appears that no one has found models using Center of Area (CoA) or Center of Gravity (CoG) defuzzification method. Although there have been some works reported to deal with modeling of fuzzy controllers via Centroid method, all of them have in fact used CoS method only. In this paper, for the first time mathematical models of the simplest Mamdani type fuzzy Proportional Integral (PI)/Proportional Derivative (PD) controllers via CoG defuzzification are presented...
May 19, 2017: ISA Transactions
https://www.readbyqxmd.com/read/28532512/inter-rater-reliability-of-kinesthetic-measurements-with-the-kinarm-robotic-exoskeleton
#5
Jennifer A Semrau, Troy M Herter, Stephen H Scott, Sean P Dukelow
BACKGROUND: Kinesthesia (sense of limb movement) has been extremely difficult to measure objectively, especially in individuals who have survived a stroke. The development of valid and reliable measurements for proprioception is important to developing a better understanding of proprioceptive impairments after stroke and their impact on the ability to perform daily activities. We recently developed a robotic task to evaluate kinesthetic deficits after stroke and found that the majority (~60%) of stroke survivors exhibit significant deficits in kinesthesia within the first 10 days post-stroke...
May 22, 2017: Journal of Neuroengineering and Rehabilitation
https://www.readbyqxmd.com/read/28532029/surfactin-loaded-polyvinyl-alcohol-pva-nanofibers-alters-adhesion-of-listeria-monocytogenes-to-polystyrene
#6
J J Ahire, D D Robertson, A J van Reenen, L M T Dicks
Surfactin-loaded polyvinyl alcohol (PVA) nanofibers were spun using gravity electrospinning. Scanning electron microscopy (SEM) images showed that nanofibers spun with surfactin are free from bead formation and uniform in diameter. The average nanofiber diameters were decreased (273±39nm, 259±39nm and 217±33nm) with increasing levels of surfactin (0.5, 1.0 and 1.5%, w/v) into PVA (10%, w/v). The 10% (w/v) PVA had average fiber diameter of 303±33nm. Atomic force microscopy (AFM) analysis showed that fibers spun with surfactin are not smooth as PVA fibers...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28529022/effect-of-microgravity-on-the-mesenchymal-stem-cell-characteristics-of-limbal-fibroblasts
#7
Shu-I Pao, Ke-Hung Chien, Hsin-Ting Lin, Ming-Cheng Tai, Jiann-Torng Chen, Chang-Min Liang
BACKGROUND: Mesenchymal stem cells (MSCs) are important for regenerative medicine. Limbal fibroblasts (LFs), present in the corneal limbus, have been shown to possess MSC characteristics, and can differentiate into other cell types. The current study sought to investigate the effect of microgravity on the proliferation and differentiation of LFs, and identify culture conditions to obtain a high proportion of LFs possessing MSC characteristics. METHODS: A rotary cell culture system was used to generate microgravity...
May 18, 2017: Journal of the Chinese Medical Association: JCMA
https://www.readbyqxmd.com/read/28527594/whole-globe-biomechanics-using-high-field-mri
#8
Andrew P Voorhees, Leon C Ho, Ning-Jiun Jan, Huong Tran, Yolandi van der Merwe, Kevin Chan, Ian A Sigal
The eye is a complex structure composed of several interconnected tissues acting together, across the whole globe, to resist deformation due to intraocular pressure (IOP). However, most work in the ocular biomechanics field only examines the response to IOP over smaller regions of the eye. We used high-field MRI to measure IOP induced ocular displacements and deformations over the whole globe. Seven sheep eyes were obtained from a local abattoir and imaged within 48 h using MRI at multiple levels of IOP. IOP was controlled with a gravity perfusion system and a cannula inserted into the anterior chamber...
May 17, 2017: Experimental Eye Research
https://www.readbyqxmd.com/read/28527584/a-combined-passive-and-active-musculoskeletal-model-study-to-estimate-l4-l5-load-sharing
#9
F Azari, N Arjmand, A Shirazi-Adl, T Rahimi-Moghaddam
A number of geometrically-detailed passive finite element (FE) models of the lumbar spine have been developed and validated under in vitro loading conditions. These models are devoid of muscles and thus cannot be directly used to simulate in vivo loading conditions acting on the lumbar joint structures or spinal implants. Gravity loads and muscle forces estimated by a trunk musculoskeletal (MS) model under twelve static activities were applied to a passive FE model of the L4-L5 segment to estimate load sharing among the joint structures (disc, ligaments, and facets) under simulated in vivo loading conditions...
May 11, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28524695/new-probe-of-departures-from-general-relativity-using-minkowski-functionals
#10
Wenjuan Fang, Baojiu Li, Gong-Bo Zhao
The morphological properties of the large scale structure of the Universe can be fully described by four Minkowski functionals (MFs), which provide important complementary information to other statistical observables such as the widely used 2-point statistics in configuration and Fourier spaces. In this work, for the first time, we present the differences in the morphology of the large scale structure caused by modifications to general relativity (to address the cosmic acceleration problem), by measuring the MFs from N-body simulations of modified gravity and general relativity...
May 5, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28524694/gravity-amplitudes-as-generalized-double-copies-of-gauge-theory-amplitudes
#11
Zvi Bern, John Joseph Carrasco, Wei-Ming Chen, Henrik Johansson, Radu Roiban
Whenever the integrand of a gauge-theory loop amplitude can be arranged into a form where the Bern-Carrasco-Johansson duality between color and kinematics is manifest, a corresponding gravity integrand can be obtained simply via the double-copy procedure. However, finding such gauge-theory representations can be challenging, especially at high loop orders. Here, we show that we can, instead, start from generic gauge-theory integrands, where the duality is not manifest, and apply a modified double-copy procedure to obtain gravity integrands that include contact terms generated by violations of dual Jacobi identities...
May 5, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28524682/violating-the-weak-cosmic-censorship-conjecture-in-four-dimensional-anti-de-sitter-space
#12
Toby Crisford, Jorge E Santos
We consider time-dependent solutions of the Einstein-Maxwell equations using anti-de Sitter (AdS) boundary conditions, and provide the first counterexample to the weak cosmic censorship conjecture in four spacetime dimensions. Our counterexample is entirely formulated in the Poincaré patch of AdS. We claim that our results have important consequences for quantum gravity, most notably to the weak gravity conjecture.
May 5, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28523311/study-concerning-the-histopathological-changes-in-chronic-hepatopathies
#13
Cristian Marius Daina, Lucia Georgeta Daina, Marinela Bonta, Daniela Rahotă, Gabriela MuŢiu
Chronic liver diseases represent a public health problem both at global level and in our country. Their significance is due not only to the large number of cases but also to their severe complications and associated diseases, which increase the gravity of prognosis. Hepatopathies generally develop by formation and accumulation of fibrous tissue, which leads to architectural distortions in the structure of the liver. Hepatic fibrosis is the result of chronic injury and plays a direct role in the pathogenesis of the hepatocellular dysfunction and portal hypertension...
2017: Romanian Journal of Morphology and Embryology, Revue Roumaine de Morphologie et Embryologie
https://www.readbyqxmd.com/read/28521092/spontaneous-rotation-of-non-linear-pattern-formed-by-aqueous-colloidal-suspension-between-ito-electrodes-during-electrolysis-perpendicular-to-gravity
#14
Kazuya Sasaki, Shuichi Sato, Takahiro Shindo, Takeo Sakawa, Hiromu Sasaki, Masahito Sano
A colloidal fluid is found to rotate spontaneously during electrolysis when gravity acts perpendicular to the direction of an applied electric field. An aqueous dispersion containing charged colloidal particles is placed inside an O-ring sandwiched between two parallel ITO electrodes. A clip is used to hold the assembly together to prevent the liquid from leaking out. The assembly is positioned such that the electrodes stand vertically, i.e., the electric field during electrolysis points perpendicular to gravity...
May 18, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28520734/interfacial-mechanisms-for-stability-of-surfactant-laden-films
#15
M Saad Bhamla, Chew Chai, Marco A Àlvarez-Valenzuela, Javier Tajuelo, Gerald G Fuller
Thin liquid films are central to everyday life. They are ubiquitous in modern technology (pharmaceuticals, coatings), consumer products (foams, emulsions) and also serve vital biological functions (tear film of the eye, pulmonary surfactants in the lung). A common feature in all these examples is the presence of surface-active molecules at the air-liquid interface. Though they form only molecular-thin layers, these surfactants produce complex surface stresses on the free surface, which have important consequences for the dynamics and stability of the underlying thin liquid film...
2017: PloS One
https://www.readbyqxmd.com/read/28520556/breast-tissue-stiffness-estimation-for-surgical-guidance-using-gravity-induced-excitation
#16
Rebekah H Griesenauer, Jared A Weis, Lori R Arlinghaus, Ingrid M Meszoely, Michael I Miga
Tissue stiffness interrogation is fundamental in breast cancer diagnosis and treatment. Furthermore, biomechanical models for predicting breast deformations have been created for several breast cancer applications. Within these applications, constitutive mechanical properties must be defined and the accuracy of this estimation directly impacts the overall performance of the model. In this study, we present an image-derived computational framework to obtain quantitative, patient specific stiffness properties for application in image-guided breast cancer surgery and interventions...
May 18, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28515784/improving-saccharomyces-cerevisiae-ethanol-production-and-tolerance-via-rna-polymerase-ii-subunit-rpb7
#17
Zilong Qiu, Rongrong Jiang
BACKGROUND: Classical strain engineering methods often have limitations in altering multigenetic cellular phenotypes. Here we try to improve Saccharomyces cerevisiae ethanol tolerance and productivity by reprogramming its transcription profile through rewiring its key transcription component RNA polymerase II (RNAP II), which plays a central role in synthesizing mRNAs. This is the first report on using directed evolution method to engineer RNAP II to alter S. cerevisiae strain phenotypes...
2017: Biotechnology for Biofuels
https://www.readbyqxmd.com/read/28512225/high-arctic-holocene-temperature-record-from-the-agassiz-ice-cap-and-greenland-ice-sheet-evolution
#18
Benoit S Lecavalier, David A Fisher, Glenn A Milne, Bo M Vinther, Lev Tarasov, Philippe Huybrechts, Denis Lacelle, Brittany Main, James Zheng, Jocelyne Bourgeois, Arthur S Dyke
We present a revised and extended high Arctic air temperature reconstruction from a single proxy that spans the past ∼12,000 y (up to 2009 CE). Our reconstruction from the Agassiz ice cap (Ellesmere Island, Canada) indicates an earlier and warmer Holocene thermal maximum with early Holocene temperatures that are 4-5 °C warmer compared with a previous reconstruction, and regularly exceed contemporary values for a period of ∼3,000 y. Our results show that air temperatures in this region are now at their warmest in the past 6,800-7,800 y, and that the recent rate of temperature change is unprecedented over the entire Holocene...
May 16, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28511651/high-resolution-mucociliary-transport-measurement-in-live-excised-large-animal-trachea-using-synchrotron-x-ray-imaging
#19
Martin Donnelley, Kaye S Morgan, Maged Awadalla, Nigel R Farrow, Chris Hall, David W Parsons
BACKGROUND: The Australian Synchrotron Imaging and Medical Beamline (IMBL) was designed as the world's widest synchrotron X-ray beam, enabling both clinical imaging and therapeutic applications for humans as well as the imaging of large animal models. Our group is developing methods for imaging the airways of newly developed CF animal models that display human-like lung disease, such as the CF pig, and we expect that the IMBL can be utilised to image airways in animals of this size. METHODS: This study utilised samples of excised tracheal tissue to assess the feasibility, logistics and protocols required for airway imaging in large animal models such as pigs and sheep at the IMBL...
May 16, 2017: Respiratory Research
https://www.readbyqxmd.com/read/28511569/weightbearing-vs-gravity-stress-radiographs-for-stability-evaluation-of-supination-external-rotation-fractures-of-the-ankle
#20
Angela Seidel, Fabian Krause, Martin Weber
BACKGROUND: Isolated lateral malleolar fractures may result from a supination-external rotation (SER) injury of the ankle. Stable fractures maintain tibiotalar congruence due to competent medial restraints and can be treated nonoperatively with excellent functional results and long-term prognosis. Stability might be assessed with either stress radiographs or weightbearing radiographs. METHODS: A consecutive series of patients with closed SER fractures (presumed AO 44-B1) were prospectively enrolled from 2008 to 2015...
May 1, 2017: Foot & Ankle International
keyword
keyword
56131
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"