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https://www.readbyqxmd.com/read/28724592/vascular-development-in-very-young-conifer-seedlings-theoretical-hydraulic-capacities-and-potential-resistance-to-embolism
#1
Megan L Miller, Daniel M Johnson
PREMISE OF THE STUDY: Conifers have the highest rates of mortality during their first year, often attributed to water stress; yet, this tree life stage is the least studied in terms of hydraulic properties. Previous work has revealed correlations between xylem anatomy to both hydraulic transport capacity and resistance to hydraulic dysfunction. In this study, we compared xylem anatomical and plant functional traits of Pseudotsuga menziesii, Larix occidentalis, and Pinus ponderosa seedlings over the first 10 wk of growth to evaluate potential maximum hydraulic capabilities and resistance to drought-induced embolism...
July 19, 2017: American Journal of Botany
https://www.readbyqxmd.com/read/28709307/determination-of-the-conformal-field-theory-central-charge-by-the-wang-landau-algorithm
#2
P A Belov, A A Nazarov, A O Sorokin
We present a simple method to estimate the central charge of the conformal field theory corresponding to a critical point of a two-dimensional lattice model from Monte Carlo simulations. The main idea is to use the Wang-Landau flat-histogram algorithm, which allows us to obtain the free energy of a lattice model on a torus as a function of torus radii. The central charge is calculated with good precision from a free-energy scaling at the critical point. We apply the method to the Ising, tricritical Ising (Blume-Capel), Potts, and site-diluted Ising models, and we also discuss an estimation of the conformal weights...
June 2017: Physical Review. E
https://www.readbyqxmd.com/read/28707926/charge-induced-saffman-taylor-instabilities-in-toroidal-droplets
#3
A A Fragkopoulos, A Aizenman, A Fernández-Nieves
We show that charged toroidal droplets can develop fingerlike structures as they expand due to Saffman-Taylor instabilities. While these are commonly observed in quasi-two-dimensional geometries when a fluid displaces another fluid of higher viscosity, we show that the toroidal confinement breaks the symmetry of the problem, effectively making it quasi-two-dimensional and enabling the instability to develop in this three-dimensional situation. We control the expansion speed of the torus with the imposed electric stress and show that fingers are observed provided the characteristic time scale associated with this instability is smaller than the characteristic time scale associated with Rayleigh-Plateau break-up...
June 30, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28707924/suppression-of-alfv%C3%A3-n-modes-on-the-national-spherical-torus-experiment-upgrade-with-outboard-beam-injection
#4
E D Fredrickson, E V Belova, D J Battaglia, R E Bell, N A Crocker, D S Darrow, A Diallo, S P Gerhardt, N N Gorelenkov, B P LeBlanc, M Podestà, Nstx-U Team
In this Letter we present data from experiments on the National Spherical Torus Experiment Upgrade, where it is shown for the first time that small amounts of high pitch-angle beam ions can strongly suppress the counterpropagating global Alfvén eigenmodes (GAE). GAE have been implicated in the redistribution of fast ions and modification of the electron power balance in previous experiments on NSTX. The ability to predict the stability of Alfvén modes, and developing methods to control them, is important for fusion reactors like the International Tokamak Experimental Reactor, which are heated by a large population of nonthermal, super-Alfvénic ions consisting of fusion generated α's and beam ions injected for current profile control...
June 30, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28703103/shining-light-in-a-dark-landscape-mri-evaluation-of-unusual-localization-of-endometriosis
#5
Benedetta Gui, Anna Lia Valentini, Valeria Ninivaggi, Maura Miccò, Viola Zecchi, Pier Paolo Grimaldi, Francesco Cambi, Maurizio Guido, Lorenzo Bonomo
Endometriosis is a disease distinguished by the presence of endometrial tissue outside the uterine cavity with intralesional recurrent bleeding and resulting fibrosis. The most common locations for endometriosis are the ovaries, pelvic peritoneum, uterosacral ligaments, and torus uterinus. Typical symptoms are secondary dysmenorrhea and cyclic or chronic pelvic pain. Unusual sites of endometriosis may be associated with specific symptoms depending on the localization. Atypical pelvic endometriosis localizations can occur in the cervix, vagina, round ligaments, ureter, and nerves...
July 2017: Diagnostic and Interventional Radiology: Official Journal of the Turkish Society of Radiology
https://www.readbyqxmd.com/read/28690405/knotted-fields-and-explicit-fibrations-for-lemniscate-knots
#6
B Bode, M R Dennis, D Foster, R P King
We give an explicit construction of complex maps whose nodal lines have the form of lemniscate knots. We review the properties of lemniscate knots, defined as closures of braids where all strands follow the same transverse (1, ℓ) Lissajous figure, and are therefore a subfamily of spiral knots generalizing the torus knots. We then prove that such maps exist and are in fact fibrations with appropriate choices of parameters. We describe how this may be useful in physics for creating knotted fields, in quantum mechanics, optics and generalizing to rational maps with application to the Skyrme-Faddeev model...
June 2017: Proceedings. Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/28690230/-comparison-between-the-effect-of-endoscopic-assisted-low-temperature-plasma-and-electric-planer-on-the-treatment-of-adenoid-hypertrophy-a-meta-analysis
#7
Shaobing Xie, Yanni Zhang, Zhenhang Xu, Jianhui Zhang, Xuewen Wu, Hong Sun
To compare the effect of endoscopic-assisted low temperature plasma (ELTP) and electric planer (EP) on the treatment of adenoid hypertrophy.
 Methods: We searched China National Knowledge Infrastructure (CNKI), Wanfang Database, Weipu Database, Chinese Biomedical Literature (CMB), PubMed, Embase, Cochrane Database, and collected the randomized controlled studies regarding the effect of ELTP and EP on the treatment of adenoid hypertrophy from January 2007 to June 2016. Methodologies were used to evaluate the included studies, and Meta-analysis was performed by Revman 5...
June 28, 2017: Zhong Nan da Xue Xue Bao. Yi Xue Ban, Journal of Central South University. Medical Sciences
https://www.readbyqxmd.com/read/28683184/comparison-of-ultra-high-performance-supercritical-fluid-chromatography-ultra-high-performance-liquid-chromatography-and-gas-chromatography-for-the-separation-of-synthetic-cathinones
#8
Stephanie Carnes, Stacey O'Brien, Angelica Szewczak, Lauriane Tremeau-Cayel, Walter F Rowe, Bruce McCord, Ira S Lurie
A comparison of ultra high performance supercritical fluid chromatography, ultra high performance liquid chromatography, and gas chromatography for the separation of synthetic cathinones has been conducted. Nine different mixtures of bath salts were analyzed in this study. The three different chromatographic techniques were examined using a general set of controlled synthetic cathinones as well as a variety of other synthetic cathinones that exist as positional isomers. Overall 35 different synthetic cathinones were analyzed...
July 6, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28666499/concurrence-of-torus-palatinus-torus-mandibularis-and-buccal-exostosis
#9
Sarfaraz Khan, Syed Asif Haider Shah, Farman Ali, Dil Rasheed
Torus palatinus (TP), torus mandibularis (TM), and buccal exostosis are localised, benign, osseous projections, occurring in maxilla and mandible. Etiology is multifactorial and not well established. Tori and exostoses have been associated with parafunctional occlusal habits, temporomandibular joint (TMJ) disorders, migraine and consumption of fish. Concurrence of TP, TM, and exostosis in the same individual is very rare. Concurrence of TPand TM has not been reported from Pakistan. We report a case of a 22-year female patient manifesting concurrence of TP, bilateral TM, and maxillary buccal exostoses; with possible association of abnormal occlusal stresses and use of calcium and vitamin D supplements...
November 2016: Journal of the College of Physicians and Surgeons—Pakistan: JCPSP
https://www.readbyqxmd.com/read/28659306/monoaminergic-integration-of-diet-and-social-signals-in-the-brains-of-juvenile-spadefoot-toads
#10
Sabrina S Burmeister, Verónica G Rodriguez Moncalvo, Karin S Pfennig
Social behavior often includes the production of species-specific signals (e.g., mating calls or visual displays) that evoke context-dependent behavioral responses from conspecifics. Monoamines are important neuromodulators that have been implicated in context-dependent social behavior yet we know little about development of the monoaminergic systems and whether they mediate the effects of early life experiences on adult behavior. We examined the effects of diet and social signals on monoamines early in development in the Plains spadefoot toad (Spea bombifrons), a species in which diet affects the developmental emergence of species recognition and body condition affects the expression of adult mating preferences...
June 28, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/28632614/images-in-anesthesiology-torus-palatinus-and-airway-management
#11
Jesse Aron, Stephen J Raithel, Andrew J Mannes
No abstract text is available yet for this article.
July 2017: Anesthesiology
https://www.readbyqxmd.com/read/28610218/two-new-brackish-water-species-of-i-macrostomum-i-platyhelminthes-%C3%A2-macrostomida-from-mangrove-wetland-in-southern-china
#12
Lei Wang, Fan Xin, Chu-Yu Fang, Y U Zhang, An-Tai Wang
In this paper, two new brackish-water species of Macrostomum (M. shenzhenensis n. sp. and M qiaochengensis n. sp.) collected from the artificial lake in Overseas Chinese Town mangrove wetland, are described based on the morphology of the penis stylet and on a molecular phylogenetic analysis. M. shenzhenensis n. sp. has an elongate, narrow stylet with torus-shaped distal wall thickening, while M. qiaochengensis n. sp. has a hook-like stylet with a pointed end. Both the 18S and 28S rDNA phylogenetic analyses of M shenzhenensis n...
June 9, 2017: Zootaxa
https://www.readbyqxmd.com/read/28599354/a-profile-of-auditory-responsive-neurons-in-the-larval-zebrafish-brain
#13
Gilles Vanwalleghem, Lucy A Heap, Ethan K Scott
Many features of auditory processing are conserved among vertebrates, but the degree to which these pathways are established at early stages is not well explored. In this study, we have observed single cell activity throughout the brains of larval zebrafish with the goal of identifying the cellular responses, brain regions, and brain-wide pathways through which these larvae perceive and process auditory stimuli. Using GCaMP and selective plane illumination microscopy, we find strong responses to auditory tones ranging from 100 to 400Hz...
June 9, 2017: Journal of Comparative Neurology
https://www.readbyqxmd.com/read/28577371/prevalence-of-torus-mandibularis-in-young-healthy-dentate-adults
#14
Koji Morita, Hiroki Tsuka, Tomoaki Shintani, Mitsuyoshi Yoshida, Hidemi Kurihara, Kazuhiro Tsuga
PURPOSE: There have been only a few reports on the prevalence of torus mandibularis (TM) in young adult patients, and TM can have various adverse effects on oral and occlusal states in middle-age patients. This study was designed to determine the association between TM status and oral and occlusal states in young healthy dentate adults. MATERIALS AND METHODS: This was a cross-sectional study; the sample population included students at Hiroshima University (Hiroshima, Japan) who participated for practical education...
May 10, 2017: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28556539/simple-rapid-and-environmentally-friendly-method-for-the-separation-of-isoflavones-using-ultra-high-performance-supercritical-fluid-chromatography
#15
Wenjie Wu, Yuan Zhang, Hanqiu Wu, Weie Zhou, Yan Cheng, Hongna Li, Chuanbin Zhang, Lulu Li, Ying Huang, Feng Zhang
Isoflavones are natural substances that exhibit hormone-like pharmacological activities. The separation of isoflavones remains an analytical challenge because of their similar structures. We show that ultra-high performance supercritical fluid chromatography can be an appropriate tool to achieve the fast separation of 12 common dietary isoflavones. Among the five tested columns the Torus DEA column was found to be the most effective column for the separation of these isoflavones. The impact of individual parameters on the retention time and separation factor was evaluated...
July 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28535051/structural-properties-of-nonionic-monorhamnolipid-aggregates-in-water-studied-by-classical-molecular-dynamics-simulations
#16
Elango Munusamy, Charles M Luft, Jeanne E Pemberton, Steven D Schwartz
Molecular dynamics simulations were carried out to investigate the structure and stabilizing factors of aggregates of the nonionic form of the most common congener of monorhamnolipids, α-rhamnopyranosyl-β-hydroxydecanoyl-β-hydroxydecanoate (Rha-C10-C10), in water. Aggregates of size ranging from 5 to 810 monomers were observed in the simulation forming spherical and ellipsoidal structures, a torus-like structure, and a unilamellar vesicle. The effects of the hydrophobic chain conformation and alignment in the aggregate, role of monomer···monomer and monomer···water H-bonds, and conformations of monomers in the aggregate were studied in detail...
June 15, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28528920/torus-mandibularis
#17
Tanay Chaubal, Ranjeet Bapat, Kartik Poonja
No abstract text is available yet for this article.
May 18, 2017: American Journal of Medicine
https://www.readbyqxmd.com/read/28527466/highly-excited-electronic-image-states-of-metallic-nanorings
#18
Christian Fey, Henrik Jabusch, Johannes Knörzer, Peter Schmelcher
We study electronic image states around a metallic nanoring and show that the interplay between the attractive polarization force and a repulsive centrifugal force gives rise to Rydberg-like image states trapped several nanometers away from the surface. The nanoring is modeled as a perfectly conducting isolated torus whose classical electrostatic image potential is derived analytically. The image states are computed via a two-dimensional finite-difference scheme as solutions of the effective Schrödinger equation describing the outer electron subject to this image potential...
May 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28505815/interaction-of-toroidal-swimmers-in-stokes-flow
#19
Jianjun Huang, Lisa Fauci
A doughnut-shaped object supporting surface rotations was a hypothetical construct proposed by both Taylor and Purcell as a swimmer that would be able to propel itself in a Stokesian fluid because of the irreversibility of its stroke. Here we numerically examine the hydrodynamic interaction of pairs and trios of these free toroidal swimmers. First, we study the axisymmetric case of two toroidal swimmers placed in tandem, and show that a single torus of a corotating pair is more efficient than when it swims alone, but less efficient when paired with a counterrotating partner...
April 2017: Physical Review. E
https://www.readbyqxmd.com/read/28505771/counterexamples-to-moffatt-s-statements-on-vortex-knots
#20
Oleg Bogoyavlenskij
One of the well-known problems of hydrodynamics is studied: the problem of classification of vortex knots for ideal fluid flows. In the literature there are known Moffatt statements that all torus knots K_{m,n} for all rational numbers m/n (0<m/n<∞) are realized as vortex knots for each one of the considered axisymmetric fluid flows. We prove that actually such a uniformity does not exist because it does not correspond to the facts. Namely, we derive a complete classification of all vortex knots realized for the fluid flows studied by Moffatt and demonstrate that the real structure of vortex knots is much more rich because the sets of mutually nonisotopic vortex knots realized for different axisymmetric fluid flows are all different...
April 2017: Physical Review. E
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