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https://www.readbyqxmd.com/read/27926854/structural-characterization-and-statistical-mechanical-model-of-epidermal-patterns
#1
Duyu Chen, Wen Yih Aw, Danelle Devenport, Salvatore Torquato
In proliferating epithelia of mammalian skin, cells of irregular polygon-like shapes pack into complex, nearly flat two-dimensional structures that are pliable to deformations. In this work, we employ various sensitive correlation functions to quantitatively characterize structural features of evolving packings of epithelial cells across length scales in mouse skin. We find that the pair statistics in direct space (correlation function) and Fourier space (structure factor) of the cell centroids in the early stages of embryonic development show structural directional dependence (statistical anisotropy), which is a reflection of the fact that cells are stretched, which promotes uniaxial growth along the epithelial plane...
December 6, 2016: Biophysical Journal
https://www.readbyqxmd.com/read/27913565/a-24-year-old-male-with-a-painful-and-cold-lower-extremity
#2
Eric A Robinson, Zain I Khalpey, Rajesh Janardhanan
CLINICAL INTRODUCTION: A 24-year-old male presented to the emergency department with intense pain in his right lower extremity. He has a medical history significant for systemic lupus erythematosus and antiphospholipid syndrome. He also had four prior episodes of deep venous thromboses on rivaroxaban. The patient stated that early in the morning, he started to feel intense pain that started from his knee and progressed to his calf, with associated numbness and paraesthesia. On physical examination, the limb felt cold with absent right popliteal and dorsalis pedis pulses...
December 2, 2016: Heart: Official Journal of the British Cardiac Society
https://www.readbyqxmd.com/read/27911551/superconductivity-emerging-from-an-electronic-phase-separation-in-the-charge-ordered-phase-of-rbfe_-2-as_-2
#3
E Civardi, M Moroni, M Babij, Z Bukowski, P Carretta
^{75}As, ^{87}Rb, and ^{85}Rb nuclear quadrupole resonance (NQR) and ^{87}Rb nuclear magnetic resonance measurements in a RbFe_{2}As_{2} iron-based superconductor are presented. We observe a marked broadening of the ^{75}As NQR spectrum below T_{0}≃140  K which is associated with the onset of a charge order in the FeAs planes. Below T_{0} we observe a power-law decrease in the ^{75}As nuclear spin-lattice relaxation rate down to T^{*}≃20  K. Below T^{*} the nuclei start to probe different dynamics owing to the different local electronic configurations induced by the charge order...
November 18, 2016: Physical Review Letters
https://www.readbyqxmd.com/read/27891682/robust-min-system-oscillation-in-the-presence-of-internal-photosynthetic-membranes-in-cyanobacteria
#4
Joshua S MacCready, Jory Schossau, Katherine W Osteryoung, Daniel C Ducat
The oscillatory Min system of Escherichia coli defines the cell division plane by regulating the site of FtsZ-ring formation and represents one of the best-understood examples of emergent protein self-organization in nature. The oscillatory patterns of the Min-system proteins MinC, MinD and MinE (MinCDE) are strongly dependent on the geometry of membranes they bind. Complex internal membranes within cyanobacteria could disrupt this self-organization by sterically occluding or sequestering MinCDE from the plasma membrane...
November 5, 2016: Molecular Microbiology
https://www.readbyqxmd.com/read/27875447/remembering-pearl-harbor-at-75-years
#5
Patricia Liehr, Janet Sopcheck, Gwyneth Milbrath
: On December 7, 1941, the Sunday-morning quiet of the U.S. naval base in Pearl Harbor, Hawaii, was shattered by dive-bombing Japanese fighter planes. The planes came in two waves-and when it was all over, more than 2,400 were killed and more than 1,100 were injured.Nurses were stationed at U.S. Naval Hospital Pearl Harbor, Tripler General Hospital (now Tripler Army Medical Center), Hickam Field Hospital, Schofield Barracks Station Hospital, and aboard the USS Solace, and witnessed the devastation. But they also did what nurses do in emergencies-they responded and provided care to those in need...
December 2016: American Journal of Nursing
https://www.readbyqxmd.com/read/27870038/variation-in-stability-of-elk-and-red-deer-populations-with-abiotic-and-biotic-factors-at-the-species-distribution-scale
#6
Farshid S Ahrestani, William K Smith, Mark Hebblewhite, Steven Running, Eric Post
Stability in population dynamics is an emergent property of the interaction between direct and delayed density dependence, the strengths of which vary with environmental covariates. Analysis of variation across populations in the strength of direct and delayed density dependence can reveal variation in stability properties of populations at the species level. We examined the stability properties of 22 elk/red deer populations in a two-stage analysis. First, we estimated direct and delayed density dependence applying an AR(2) model in a Bayesian hierarchical framework...
November 2016: Ecology
https://www.readbyqxmd.com/read/27869646/magnetoelectric-effects-in-the-spiral-magnets-cucl2-and-cubr2
#7
P Tolédano, A P Ayala, A F G Furtado Filho, J P C do Nascimento, M A S Silva, A S B Sombra
The nature and symmetry of transition mechanisms in the spin-spiral copper halides CuCl2 and CuBr2 are analyzed theoretically. The magnetoelectric effects observed in the two multiferroic compounds are described and their phase diagram at zero and applied magnetic fields are worked out. The emergence of the electric polarization at zero field below the paramagnetic phase is shown to result from the coupling of two distinct spin-density waves and to be only partly related to the Dzialoshinskii-Moriya interactions...
November 21, 2016: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/27866607/synthesis-of-silver-nanoparticles-by-endosymbiont-pseudomonas-fluorescens-ca-417-and-their-bactericidal-activity
#8
Baker Syed, Nagendra Prasad M N, Dhananjaya B L, Mohan Kumar K, Yallappa S, Satish S
The present study emphasizes on biogenic synthesis of silver nanoparticles and their bactericidal activity against human and phytopathogens. Nanoparticle synthesis was performed using endosymbiont Pseudomonas fluorescens CA 417 inhabiting Coffea arabica L. Synthesized nanoparticles were characterized using hyphenated spectroscopic techniques such as UV-vis spectroscopy which revealed maximum absorption 425nm. Fourier transform infrared spectroscopy (FTIR) analysis revealed the possible functional groups mediating and stabilizing silver nanoparticles with predominant peaks occurring at 3346 corresponding to hydroxyl group, 1635 corresponding carbonyl group and 680 to aromatic group...
December 2016: Enzyme and Microbial Technology
https://www.readbyqxmd.com/read/27846845/relationship-between-native-papillary-muscle-t1-time-and-severity-of-functional-mitral-regurgitation-in-patients-with-non-ischemic-dilated-cardiomyopathy
#9
Shingo Kato, Shiro Nakamori, Sébastien Roujol, Francesca N Delling, Shadi Akhtari, Jihye Jang, Tamer Basha, Sophie Berg, Kraig V Kissinger, Beth Goddu, Warren J Manning, Reza Nezafat
BACKGROUND: Functional mitral regurgitation is one of the severe complications of non-ischemic dilated cardiomyopathy (DCM). Non-contrast native T1 mapping has emerged as a non-invasive method to evaluate myocardial fibrosis. We sought to evaluate the potential relationship between papillary muscle T1 time and mitral regurgitation in DCM patients. METHODS: Forty DCM patients (55 ± 13 years) and 20 healthy adult control subjects (54 ± 13 years) were studied...
November 16, 2016: Journal of Cardiovascular Magnetic Resonance
https://www.readbyqxmd.com/read/27833745/advances-in-real-time-magnetic-resonance-imaging-of-the-vocal-tract-for-speech-science-and-technology-research
#10
Asterios Toutios, Shrikanth S Narayanan
Real-time magnetic resonance imaging (rtMRI) of the moving vocal tract during running speech production is an important emerging tool for speech production research providing dynamic information of a speaker's upper airway from the entire mid-sagittal plane or any other scan plane of interest. There have been several advances in the development of speech rtMRI and corresponding analysis tools, and their application to domains such as phonetics and phonological theory, articulatory modeling, and speaker characterization...
2016: APSIPA Transactions on Signal and Information Processing
https://www.readbyqxmd.com/read/27824556/ultrasound-vector-flow-imaging-part-ii-parallel-systems
#11
Jorgen Arendt Jensen, Svetoslav Ivanov Nikolov, Alfred C H Yu, Damien Garcia
This paper gives a review of the current state-of-the-art in ultrasound parallel acquisition systems for flow imaging using spherical and plane waves emissions. The imaging methods are explained along with the advantages of using these very fast and sensitive velocity estimators. These experimental systems are capable of acquiring thousands of images per second for fast moving flow as well as yielding the estimates of low velocity flow. These emerging techniques allow the vector flow systems to assess highly complex flow with transitory vortices and moving tissue, and they can also be used in functional ultrasound imaging for studying brain function in animals...
November 2016: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/27824469/unusual-dirac-fermions-on-the-surface-of-a-noncentrosymmetric-%C3%AE-bipd-superconductor
#12
S Thirupathaiah, Soumi Ghosh, Rajveer Jha, E D L Rienks, Kapildeb Dolui, V V Ravi Kishore, B Büchner, Tanmoy Das, V P S Awana, D D Sarma, J Fink
Combining multiple emergent correlated properties such as superconductivity and magnetism within the topological matrix can have exceptional consequences in garnering new and exotic physics. Here, we study the topological surface states from a noncentrosymmetric α-BiPd superconductor by employing angle-resolved photoemission spectroscopy and first-principles calculations. We observe that the Dirac surface states of this system have several interesting and unusual properties, compared to other topological surface states...
October 21, 2016: Physical Review Letters
https://www.readbyqxmd.com/read/27815809/prevalence-of-thoracic-spine-lesions-masquerading-as-cauda-equina-syndrome-yield-of-a-novel-magnetic-resonance-imaging-protocol
#13
Katherine Stolper, James Clark Haug, Chad Todd Christensen, Kathleen Michelle Samsey, Michael David April
Our objective was to describe the yield of actionable thoracic spine lesions for a novel magnetic resonance imaging (MRI) protocol including evaluation of the thoracic spine among patients presenting to the Emergency Department (ED) with symptoms consistent with epidural compression syndrome. Our ED and Department of Radiology together designed a novel rapid MRI protocol entailing 3D volumetric T2 weighted sequences through both the thoracic and lumbar spine obtained in the sagittal plane to assess for both lumbar and thoracic spine lesions...
November 4, 2016: Internal and Emergency Medicine
https://www.readbyqxmd.com/read/27804175/pilot-study-of-mri-us-fusion-in-the-assessment-of-the-cesarean-section-scar-in-the-postpartum-period
#14
Kristina Bolten, Thomas Fischer, Yvonne Yi-Na Bender, Gerd Diederichs, Anke Thomas
OBJECTIVES: To prospectively evaluate the uterine scar after Cesarean section (CS) as well as the corresponding uterine region after vaginal delivery (VD) at 6 weeks using transabdominal (TAUS) and transvaginal ultrasound (TVUS) and magnetic resonance imaging (MRI)/US image fusion to investigate whether image fusion allows standardized and reproducible localization of the scar and uterine wall thickness measurement compared with high-resolution MRI. METHODS: Six weeks after delivery, plain pelvic MRI (was performed in 30 women (10 each after planned Cesarean section (PCS), emergency Cesarean section (ECS), and VD)...
November 2, 2016: Ultrasound in Obstetrics & Gynecology
https://www.readbyqxmd.com/read/27793505/emergency-physician-performed-tricuspid-annular-plane-systolic-excursion-in-the-evaluation-of-suspected-pulmonary-embolism
#15
James Daley, John Grotberg, Joseph Pare, Amanda Medoro, Rachel Liu, Michael Kennedy Hall, Andrew Taylor, Christopher L Moore
OBJECTIVES: The primary objectives were to describe the diagnostic characteristics tricuspid annular plane systolic excursion (TAPSE) for pulmonary embolism (PE) and to optimize the measurement cutoff of TAPSE for the diagnosis of PE. Secondary objectives included assessment of interrater reliability and the quantitative visual estimation of TAPSE. METHODS: This is a prospective observational cohort study involving a convenience sample of patients at an urban academic emergency department...
October 11, 2016: American Journal of Emergency Medicine
https://www.readbyqxmd.com/read/27792940/superior-catalytic-performances-of-platinum-nanoparticles-loaded-nitrogen-doped-graphene-toward-methanol-oxidation-and-hydrogen-evolution-reaction
#16
Dong Liu, Libo Li, Tianyan You
The catalysts with excellent catalytic properties and low-cost are still highly desirable in many fields, such as fuel cells. In respect of this challenge, we have synthesized high-quality platinum nanoparticles loaded nitrogen-doped graphene (Pt/NG) by using formic acid as reduction agent and commercial-available nitrogen-doped graphene (N-graphene) as supporting materials. The morphology and component characterization demonstrate that high-loading Pt nanoparticles with a mean diameter of 2.5nm were uniformly dispersed on nitrogen-doped graphene...
October 18, 2016: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/27776642/type-a-aortic-dissection-are-there-ct-signs-suggestive-of-valvular-involvement
#17
Alexandra Platon, Stephane Bernard, Nils Perrin, Nicolas Murith, Gregor John, Thomas Perneger, Olivier T Rutschmann, Pierre-Alexandre Poletti
AIM: To identify the predictive signs of aortic valve involvement on the non-electrocardiogram (ECG)-gated admission computed tomography (CT) of patients with Type A aortic dissection (AD) according to the Stanford classification. MATERIALS AND METHODS: We retrospectively analyzed the non-ECG-gated CT examinations of patients admitted to the emergency department who underwent surgery for Type A AD over a period of 4 years. The diameter of the following structures was calculated as the mean of the smallest and largest diameters (mm) measured in two different planes: aortic annulus, sinus of Valsalva, sinotubular junction, and proximal ascending aorta...
November 2016: European Journal of Radiology
https://www.readbyqxmd.com/read/27760750/random-allocation-of-blastomere-descendants-to-the-trophectoderm-and-icm-of-the-bovine-blastocyst
#18
Lessly P Sepulveda-Rincon, Delphine Dube, Pierre Adenot, Ludivine Laffont, Sylvie Ruffini, Laurence Gall, Bruce K Campbell, Veronique Duranthon, Nathalie Beaujean, Walid E Maalouf
The first lineage specification during mammalian embryo development can be visually distinguished at blastocyst stage. Two cell lineages are observed on the embryonic/abembryonic axis of the blastocyst: the inner cell mass and the trophectoderm. The timing and mechanisms driving this process are still not fully understood. In mouse embryos, cells seem pre-patterned to become certain cell lineage; as the first cleavage plane has been related with further embryonic-abembryonic axis at blastocyst stage. Nevertheless, this possibility has been very debatable...
October 19, 2016: Biology of Reproduction
https://www.readbyqxmd.com/read/27753431/a-theoretical-review-on-electronic-magnetic-and-optical-properties-of-silicene
#19
Suman Chowdhury, Debnarayan Jana
Inspired by the success of graphene, various two dimensional (2D) structures in free standing (FS) (hypothetical) form and on different substrates have been proposed recently. Silicene, a silicon counterpart of graphene, is predicted to possess massless Dirac fermions and to exhibit an experimentally accessible quantum spin Hall effect. Since the effective spin-orbit interaction is quite significant compared to graphene, buckling in silicene opens a gap of 1.55 meV at the Dirac point. This band gap can be further tailored by applying in plane stress, an external electric field, chemical functionalization and defects...
October 18, 2016: Reports on Progress in Physics
https://www.readbyqxmd.com/read/27746550/a-prospective-randomized-control-study-comparing-classic-laryngeal-mask-airway-with-guedel-s-airway-for-tracheal-tube-exchange-and-smooth-extubation
#20
Shruti Jain, Nazia Nazir, Rashid M Khan, Syed M Ahmed
INTRODUCTION: Extubation in deep plane of anesthesia followed by Guedel's oropharyngeal airway (OPA™) insertion is a routine method to avoid hemodynamic changes associated with tracheal extubation. Exchange of endotracheal tube (ETT) with Classic laryngeal mask airway (LMA™) prior to emergence from anesthesia also serves similar purpose. We had compared the hemodynamic changes involved during this ETT/LMA™ and ETT/OPA™ exchange technique. MATERIAL AND METHODS: This was a randomized prospective study on ASA I and 2 patients undergoing elective surgery under general anesthesia...
September 2016: Anesthesia, Essays and Researches
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