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https://www.readbyqxmd.com/read/28901617/dual-rotation-c-arm-cone-beam-computed-tomography-to-increase-low-contrast-detection
#1
Aymeric Reshef, Cyril Riddell, Yves Trousset, Saïd Ladjal, Isabelle Bloch
PURPOSE: This paper investigates the capabilities of a dual-rotation C-arm cone-beam computed tomography (CBCT) framework to improve non-contrast-enhanced low-contrast detection for full volume or volume-of-interest (VOI) brain imaging. METHOD: The idea is to associate two C-arm short-scan rotational acquisitions (spins): one over the full detector field of view (FOV) at low dose, and one collimated to deliver a higher dose to the central densest parts of the head...
September 2017: Medical Physics
https://www.readbyqxmd.com/read/28796525/quantifying-remote-heating-from-propagating-surface-plasmon-polaritons
#2
Charlotte I Evans, Pavlo Zolotavin, Alessandro Alabastri, Jian Yang, Peter Nordlander, Douglas Natelson
We report a method to electrically detect heating from excitation of propagating surface plasmon polaritons (SPP). The coupling between SPP and a continuous wave laser beam is realized through lithographically defined gratings in the electrodes of thin film gold "bow tie" nanodevices. The propagating SPPs allow remote coupling of optical energy into a nanowire constriction. Heating of the constriction is detectable through changes in the device conductance and contains contributions from both thermal diffusion of heat generated at the grating and heat generated locally at the constriction by plasmon dissipation...
September 13, 2017: Nano Letters
https://www.readbyqxmd.com/read/28767643/bow-tie-signaling-in-c-di-gmp-machine-learning-in-a-simple-biochemical-network
#3
Jinyuan Yan, Maxime Deforet, Kerry E Boyle, Rayees Rahman, Raymond Liang, Chinweike Okegbe, Lars E P Dietrich, Weigang Qiu, Joao B Xavier
Bacteria of many species rely on a simple molecule, the intracellular secondary messenger c-di-GMP (Bis-(3'-5')-cyclic dimeric guanosine monophosphate), to make a vital choice: whether to stay in one place and form a biofilm, or to leave it in search of better conditions. The c-di-GMP network has a bow-tie shaped architecture that integrates many signals from the outside world-the input stimuli-into intracellular c-di-GMP levels that then regulate genes for biofilm formation or for swarming motility-the output phenotypes...
August 2017: PLoS Computational Biology
https://www.readbyqxmd.com/read/28766637/ligand-directed-synthesis-of-mn-twisted-bow-ties
#4
María José Heras Ojea, Moya A Hay, Giacomo Cioncoloni, Gavin A Craig, Claire Wilson, Takuya Shiga, Hiroki Oshio, Mark D Symes, Mark Murrie
Two isostructural polymetallic complexes [Mn(μ3-O)2(CH3COO)4(L1)4](-) and [Mn(μ3-O)2(CH3COO)4(L2)4](-) have been synthesised by using two Schiff base ligands derived from 3,5-diamino-1,2,4-triazole, following two different preparative routes, either using the pre-formed ligand (for L1) or via a metal-mediated template synthesis (for L2). The {Mn} structure is unusual, being based on two corner-sharing perpendicular {Mn3} triangles forming a twisted bow-tie. The magnetic studies reveal antiferromagnetic coupling between Mn(iii) ions while electrochemical experiments are consistent with a quasi-reversible Mn(iii)↔Mn(iv) redox process at the central manganese ion...
August 29, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28731722/dynamically-reconfigurable-metadevice-employing-nanostructured-phase-change-materials
#5
Zhihua Zhu, Philip G Evans, Richard F Haglund, Jason G Valentine
Mastering dynamic free-space spectral control and modulation in the near-infrared (NIR) and optical regimes remains a challenging task that is hindered by the available functional materials at high frequencies. In this work, we have realized an efficient metadevice capable of spectral control by minimizing the thermal mass of a vanadium dioxide phase-change material (PCM) and placing the PCM at the feed gap of a bow-tie field antenna. The device has an experimentally measured tuning range of up to 360 nm in the NIR and a modulation depth of 33% at the resonant wavelength...
July 28, 2017: Nano Letters
https://www.readbyqxmd.com/read/28657474/-you-have-to-bow-right-here-heteronormative-scripts-and-intimate-partner-violence-in-women-s-same-sex-relationships
#6
Nadia Sanger, Ingrid Lynch
Intimate partner violence is increasingly recognised as occurring not only between heterosexual partners but also in same-sex relationships. Heterogendered relationship norms have been identified as intersecting with other social inequalities to create and sustain power differentials between partners - and fuel violence - yet remain largely unexplored in relation to women's same-sex relationships. Building on existing feminist research we explore the use of gendered scripts in South African lesbian and bisexual women's accounts of relationship norms and practices...
June 28, 2017: Culture, Health & Sexuality
https://www.readbyqxmd.com/read/28632671/recognizing-the-hourglass-bow-tie-pattern
#7
Harsimran Singh
No abstract text is available yet for this article.
July 2017: Regional Anesthesia and Pain Medicine
https://www.readbyqxmd.com/read/28602651/a-bhlh-code-for-sexually-dimorphic-form-and-function-of-the-c-%C3%A2-elegans-somatic-gonad
#8
Maria D Sallee, Hana E Littleford, Iva Greenwald
How sexually dimorphic gonads are generated is a fundamental question at the interface of developmental and evolutionary biology [1-3]. In C. elegans, sexual dimorphism in gonad form and function largely originates in different apportionment of roles to three regulatory cells of the somatic gonad primordium in young larvae. Their essential roles include leading gonad arm outgrowth, serving as the germline niche, connecting to epithelial openings, and organizing reproductive organ development. The development and function of the regulatory cells in both sexes requires the basic-helix-loop-helix (bHLH) transcription factor HLH-2, the sole ortholog of the E proteins mammalian E2A and Drosophila Daughterless [4-8], yet how they adopt different fates to execute their different roles has been unknown...
June 19, 2017: Current Biology: CB
https://www.readbyqxmd.com/read/28590940/simdosect-dose-reporting-software-based-on-monte-carlo-simulation-for-a-320-detector-row-cone-beam-ct-scanner-and-icrp-computational-adult-phantoms
#9
Maria Cros, Raoul Joemai, Jacob Koos Geleijns, Diego Molina, Marçal Salvadó
This study aims to develop and test software for assessing and reporting doses for standard patients undergoing computed tomography (CT) examinations in a 320 detector-row cone-beam scanner. The software, called SimDoseCT, is based on Monte Carlo (MC) simulation code, which was developed to calculate organ- and effective doses in ICRP anthropomorphic adult reference computational phantoms for acquisitions with the Aquilion ONE CT scanner (Toshiba). MC simulation was validated by comparing CTDI measurements within standard CT dose phantoms with results from simulation under the same conditions...
June 7, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28513847/transmission-characteristics-of-a-two-dimensional-antiscatter-grid-prototype-for-cbct
#10
Cem Altunbas, Brian Kavanagh, Timur Alexeev, Moyed Miften
AIM: High fraction of scattered radiation in cone-beam CT (CBCT) imaging degrades CT number accuracy and visualization of low contrast objects. To suppress scatter in CBCT projections, we developed a focused, two-dimensional antiscatter grid (2DASG) prototype. In this work, we report on the primary and scatter transmission characteristics of the 2DASG prototype aimed for linac mounted, offset detector geometry CBCT systems in radiation therapy, and compared its performance to a conventional one-dimensional ASG (1DASG)...
August 2017: Medical Physics
https://www.readbyqxmd.com/read/28437972/integration-of-bow-tie-plasmonic-nano-antennas-on-tapered-fibers
#11
Abdul Khaleque, Evgeny G Mironov, Jonas H Osório, Ziyuan Li, Cristiano M B Cordeiro, Liming Liu, Marcos A R Franco, Jong-Leng Liow, Haroldo T Hattori
In this article, a new and flexible approach to control the electric field enhancement of bow-tie nano-antennas by integrating them on the lateral of a tapered optical fiber is proposed. The device is driven by a Q-switched laser and the performance of a fabricated nano-antenna in a quartz slide is tested by a Surface Enhanced Raman Scattering (SERS) experiment. A refractive index sensing experiment is also performed and a sensitivity of (240 ± 30) nm/RIU is found in the 1.33-1.35 index range.
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28430526/the-bow-tie-shape-of-the-anterior-cruciate-ligament-as-visualized-by-high-resolution-magnetic-resonance-imaging
#12
Kang Min Sohn, Min Jin Lee, Helen Hong, Young Cheol Yoon, Chan Deok Park, Joon Ho Wang
BACKGROUND: Although numerous studies have examined the anatomic characteristics of the anterior cruciate ligament (ACL), its actual shape remains unclear. PURPOSE: To determine the average shape of the ACL by analyzing its cross section through the use of high-resolution magnetic resonance imaging (MRI) data. STUDY DESIGN: Descriptive laboratory study. METHODS: The study included 96 MRIs, conducted using a 3.0-T magnet, to analyze the shape of the ACL...
July 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28396077/-and-dpsir-begat-dapsi-w-r-m-a-unifying-framework-for-marine-environmental-management
#13
M Elliott, D Burdon, J P Atkins, A Borja, R Cormier, V N de Jonge, R K Turner
The marine environment is a complex system formed by interactions between ecological structure and functioning, physico-chemical processes and socio-economic systems. An increase in competing marine uses and users requires a holistic approach to marine management which considers the environmental, economic and societal impacts of all activities. If managed sustainably, the marine environment will deliver a range of ecosystem services which lead to benefits for society. In order to understand the complexity of the system, the DPSIR (Driver-Pressure-State-Impact-Response) approach has long been a valuable problem-structuring framework used to assess the causes, consequences and responses to change in a holistic way...
May 15, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28393029/comparison-of-visual-and-topographic-outcomes-of-deep-anterior-lamellar-keratoplasty-and-penetrating-keratoplasty-in-keratoconus
#14
Bora Yüksel, Baran Kandemir, Umut Duygu Uzunel, Ozan Çelik, Sezgin Ceylan, Tuncay Küsbeci
AIM: To compare visual, surgical and topographic outcomes of deep anterior lamellar keratoplasty (DALK) and penetrating keratoplasty (PK) for keratoconus (KC). METHODS: In this multicenter, prospective, randomized clinical trial 76 eyes of 71 KC patients operated between January 2011 and July 2014 in 2 tertiary referral hospitals were included. Consecutive patients were alternately selected to receive one of the two surgical methods. Thirty eight eyes underwent DALK with the big-bubble technique and 38 eyes underwent PK...
2017: International Journal of Ophthalmology
https://www.readbyqxmd.com/read/28389337/recognition-memory-induced-gene-expression-in-the-perirhinal-cortex-a-transcriptomic-analysis
#15
Hannah Scott, Mark F Rogers, Helen L Scott, Colin Campbell, Elizabeth C Warburton, James B Uney
We have used transcriptome analysis to identify genes and pathways that are activated during recognition memory formation in the perirhinal cortex. Rats were exposed to objects either repeatedly, so that the objects become familiar, or to novel objects in a bow-tie maze over six consecutive days. On the final day, one hour after the last exposure to the series of objects, RNA from the perirhinal cortex was sequenced to compare the transcriptome of naïve control rats and rats exposed to either novel or familiar stimuli...
June 15, 2017: Behavioural Brain Research
https://www.readbyqxmd.com/read/28298210/delineating-functional-principles-of-the-bow-tie-structure-of-a-kinase-phosphatase-network-in-the-budding-yeast
#16
Diala Abd-Rabbo, Stephen W Michnick
BACKGROUND: Kinases and phosphatases (KP) form complex self-regulating networks essential for cellular signal processing. In spite of having a wealth of data about interactions among KPs and their substrates, we have very limited models of the structures of the directed networks they form and consequently our ability to formulate hypotheses about how their structure determines the flow of information in these networks is restricted. RESULTS: We assembled and studied the largest bona fide kinase-phosphatase network (KP-Net) known to date for the yeast Saccharomyces cerevisiae...
March 16, 2017: BMC Systems Biology
https://www.readbyqxmd.com/read/28273836/mid-infrared-trace-gas-sensor-technology-based-on-intracavity-quartz-enhanced-photoacoustic-spectroscopy
#17
Jacek Wojtas, Aleksander Gluszek, Arkadiusz Hudzikowski, Frank K Tittel
The application of compact inexpensive trace gas sensor technology to a mid-infrared nitric oxide (NO) detectoion using intracavity quartz-enhanced photoacoustic spectroscopy (I-QEPAS) is reported. A minimum detection limit of 4.8 ppbv within a 30 ms integration time was demonstrated by using a room-temperature, continuous-wave, distributed-feedback quantum cascade laser (QCL) emitting at 5.263 µm (1900.08 cm(-1)) and a new compact design of a high-finesse bow-tie optical cavity with an integrated resonant quartz tuning fork (QTF)...
March 4, 2017: Sensors
https://www.readbyqxmd.com/read/28256854/mapping-the-structure-of-directed-networks-beyond-the-bow-tie-diagram
#18
G Timár, A V Goltsev, S N Dorogovtsev, J F F Mendes
We reveal a hierarchical, multilayer organization of finite components-i.e., tendrils and tubes-around the giant connected components in directed networks and propose efficient algorithms allowing one to uncover the entire organization of key real-world directed networks, such as the World Wide Web, the neural network of Caenorhabditis elegans, and others. With increasing damage, the giant components decrease in size while the number and size of tendril layers increase, enhancing the susceptibility of the networks to damage...
February 17, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28122478/a-no-moving-parts-sensor-for-the-detection-of-eye-fixation-using-polarised-light-and-retinal-birefringence-information
#19
Boris I Gramatikov, David L Guyton
Polarised near-infra-red light is reflected from the foveal area in a detectable bow-tie pattern of polarisation states, offering the opportunity for eye tracking. A coaxial optical transducer was developed, consisting of a laser diode, a polariser, a filter, and a photodetector. Several such transducers may be used to interrogate different spots on the retina, thus eliminating the requirement for scanning systems with moving parts. To test the signal quality obtainable, using just one transducer, a test subject was asked to fixate successively on twelve targets located on a circle around the transducer, to simulate the retina's being interrogated by twelve sensors placed on a 3(0) diameter circle surrounding the projection of the fovea...
January 26, 2017: Journal of Medical Engineering & Technology
https://www.readbyqxmd.com/read/28122238/evolutionary-remodeling-of-bacterial-motility-checkpoint-control
#20
Bin Ni, Bhaswar Ghosh, Ferencz S Paldy, Remy Colin, Thomas Heimerl, Victor Sourjik
Regulatory networks play a central role in the relationship between genotype and phenotype in all organisms. However, the mechanisms that underpin the evolutionary plasticity of these networks remain poorly understood. Here, we used experimental selection for enhanced bacterial motility in a porous environment to explore the adaptability of one of the most complex networks known in bacteria. We found that the resulting phenotypic changes are mediated by adaptive mutations in several functionally different proteins, including multiple components of the flagellar motor...
January 24, 2017: Cell Reports
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