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https://www.readbyqxmd.com/read/28813485/magnetic-lenz-lenses-improve-the-limit-of-detection-in-nuclear-magnetic-resonance
#1
Nils Spengler, Peter T While, Markus V Meissner, Ulrike Wallrabe, Jan G Korvink
A high NMR detection sensitivity is indispensable when dealing with mass and volume-limited samples, or whenever a high spatial resolution is required. The use of miniaturised RF coils is a proven way to increase sensitivity, but situations may arise where space restrictions could prevent the use of a small resonant coil, e.g., in the interior of the smallest practicable micro-coils. We present the use of magnetic lenses, denoted as Lenz lenses due to their working principle, to focus the magnetic flux of an RF coil into a smaller volume and thereby locally enhance the sensitivity of the NMR experiment-at the expense of the total sensitive volume...
2017: PloS One
https://www.readbyqxmd.com/read/28808468/treatment-of-a-maxillary-second-molar-with-one-buccal-and-two-palatal-roots-confirmed-with-cone-beam-computed-tomography
#2
Masoud Parirokh, Mahsa Razifar, Hamed Manochehrifar, Paul V Abbott, Nima Hatami, Nargessaddat Kashi, Aida Farhadi
Root canal configuration is an important subject in endodontic practice and dentists should be familiar with all possible types of root canal configuration. A forty-three year old male was referred for root canal treatment of his maxillary left second molar tooth with symptomatic irreversible pulpitis. Pre-operative radiographs showed a three rooted molar. However, after access cavity preparation two palatal and one buccal orifices were detected. The patient was informed of the unusual root canal anatomy and cone-beam computed tomography (CBCT) was ordered for precise evaluation of the anatomy...
2017: Iranian Endodontic Journal
https://www.readbyqxmd.com/read/28807747/pretreatment-3t-multiparametric-mri-staging-predicts-for-biochemical-failure-in-high-risk-prostate-cancer-treated-with-combination-high-dose-rate-brachytherapy-and-external-beam-radiotherapy
#3
John V Hegde, D Jeffrey Demanes, Darlene Veruttipong, Jagdeep Raince, Sang-June Park, Steven S Raman, Nicholas G Nickols, Christopher R King, Amar U Kishan, Michael L Steinberg, Mitchell Kamrava
PURPOSE: To determine whether pretreatment 3T multiparametric MRI (mpMRI) staging impacts biochemical recurrence-free survival (BRFS) or distant metastasis-free survival (DMFS) for men with high-risk prostate cancer treated with combination high-dose-rate (HDR) brachytherapy and external beam radiation therapy (EBRT). MATERIALS AND METHODS: This institutional review board-approved retrospective study included a cohort of 37 men with high-risk prostate cancer treated with HDR brachytherapy and EBRT after 3T mpMRI...
August 11, 2017: Brachytherapy
https://www.readbyqxmd.com/read/28804257/gyro-elastic-beams-for-the-vibration-reduction-of-long-flexural-systems
#4
G Carta, I S Jones, N V Movchan, A B Movchan, M J Nieves
The paper presents a model of a chiral multi-structure incorporating gyro-elastic beams. Floquet-Bloch waves in periodic chiral systems are investigated in detail, with the emphasis on localization and the formation of standing waves. It is found that gyricity leads to low-frequency standing modes and generation of stop-bands. A design of an earthquake protection system is offered here, as an interesting application of vibration isolation. Theoretical results are accompanied by numerical simulations in the time-harmonic regime...
July 2017: Proceedings. Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/28799403/combined-4-component-and-relativistic-pseudopotential-study-of-tho-for-the-electron-electric-dipole-moment-search
#5
L V Skripnikov
A precise theoretical study of the electronic structure of heavy atom diatomic molecules is of key importance to interpret the experiments in the search for violation of time-reversal (T) and spatial-parity (P) symmetries of fundamental interactions in terms of the electron electric dipole moment, eEDM, and dimensionless constant, kT,P, characterizing the strength of the T,P-odd pseudoscalar-scalar electron-nucleus neutral current interaction. The ACME collaboration has recently improved limits on these quantities using a beam of ThO molecules in the electronic H(3)Δ1 state [J...
December 7, 2016: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28789933/radiation-protection-in-dental-radiology-recent-advances-and-future-directions
#6
V Tsapaki
Dental radiology uses X-ray technology to diagnose and design treatment of various clinical problems related to the oral cavity and surrounding tissues. As technology quickly evolves, there are numerous X-ray modalities using different tools in the attempt to best image and treat efficiently these diseases, disorders or other related clinical conditions. The reported numbers of dental X-rays, the fact that these may be under-reported in many countries and because dental X-rays are performed more on younger individuals, whose teeth and dentition are still developing, calls for increased need on radiation protection...
August 5, 2017: Physica Medica: PM
https://www.readbyqxmd.com/read/28780248/invasive-follicular-variant-of-papillary-thyroid-cancer-harboring-the-nras-mutation-q61k-and-presenting-with-bone-metastasis-a-case-report
#7
Raman Mehrzad, Michiya Nishino, Carmelo Nucera, Dora Dias-Santagata, James V Hennessey, Per-Olof Hasselgren
INTRODUCTION: The follicular variant of papillary thyroid cancer (FVPTC) can be noninvasive or invasive. The invasive form of FVPTC commonly harbors BRAF mutations whereas RAS mutations are more often associated with noninvasive FVPTC and a favorable clinical outcome. CASE REPORT: A 47-year-old man presented with a metastasis to his right iliac bone as the initial manifestation of a 1.6cm invasive FVPTC. After total thyroidectomy, the patient underwent additional treatment, including thyroid hormone suppressive treatment to non-detectable TSH levels, repeated courses of radioiodine treatment, external beam radiation, and treatment with the tyrosine kinase inhibitor sorafenib...
July 20, 2017: International Journal of Surgery Case Reports
https://www.readbyqxmd.com/read/28777618/generation-of-rogue-waves-in-gyrotrons-operating-in-the-regime-of-developed-turbulence
#8
N S Ginzburg, R M Rozental, A S Sergeev, A E Fedotov, I V Zotova, V P Tarakanov
Within the framework of the average approach and direct 3D PIC (particle-in-cell) simulations, we demonstrate that the gyrotrons operating in the regime of developed turbulence can sporadically emit "giant" spikes with intensities a factor of 100-150 greater than the average radiation power and a factor of 6-9 exceeding the power of the driving electron beams. Together with the statistical features such as a long-tail probability distribution, this allows the interpretation of generated spikes as microwave rogue waves...
July 21, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28764542/mini-beam-modes-on-standard-mx-beamline-bl17u-at-ssrf
#9
Qisheng Wang, Feng Yu, Ying Cui, Kunhao Zhang, Qiangyan Pan, Changyou Zhong, Ke Liu, Huan Zhou, Bo Sun, Jianhua He
The macromolecular crystallography beamlines at third-generation synchrotron facilities play a central role in solving macromolecular crystal structures and also in understanding the biological function at molecular levels. The MX beamline BL17U at Shanghai Synchrotron Radiation Facility is a typical standard MX beamline with a focused beam size (H × V) of FWHM around 80 μm × 45 μm. However the protein samples brought to the beamline are down to 5-10 m from the important and challenging science project now...
July 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/28764513/note-diagnostic-deuterium-beam-with-an-ultra-small-energy-spread-for-plasma-spectroscopy
#10
V Ya Savkin, A A Lizunov
The DINA-5M diagnostic atomic beam has been upgraded to reduce the energy spread down to 50 eV. An active voltage stabilization system introduces a chain of varistors connected in series that can be switched with the time constant of 70 μs to minimize the deviation from the reference to the high-voltage level. Using deuterium, the enhanced diagnostic beam has the current of four atomic amperes and the energy of 50 keV ± 50 eV. The primary considered application is a motional Stark effect diagnostic combined with laser-induced fluorescence, where the beam energy spread is an ultimate parameter determining the measurement performance...
July 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/28764496/microcantilever-array-instrument-based-on-optical-fiber-and-performance-analysis
#11
Guangping Zhang, Lin Wu, Chao Li, Shangquan Wu, Qingchuan Zhang
We developed a microcantilever array biosensor instrument based on optical readout from a microcantilever array in fluid environment. The microcantilever signals were read out sequentially by laser beams emitted from eight optical fibers. The optical fibers were coupled to lasers, while the other ends of the fibers were embedded in eight V-grooves with 250 μm pitch microfabricated from a Si wafer. Aspherical lens was used to keep the distance between lasers. A programmable logic controller was used to make the system work stably...
July 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/28761249/retrievability-of-calcium-hydroxide-intracanal-medicament-with-three-calcium-chelators-ethylenediaminetetraacetic-acid-citric-acid-and-chitosan-from-root-canals-an-in-vitro-cone-beam-computed-tomography-volumetric-analysis
#12
Ramya Raghu, Geethu Pradeep, Ashish Shetty, P M Gautham, P G Puneetha, T V Satyanarayana Reddy
AIM: This study compared the amount of aqueous-based and oil-based calcium hydroxide remaining in the canal, after removal with two different chelators 17% EDTA, 20% Citric acid and 0.2% Chitosan in combination with ultrasonic agitation. METHODS AND MATERIAL: Cleaning and shaping of root canals of 28 mandibular premolar was done and canals were filled either with Metapex or Ca(OH)2 mixed with distilled water. Volumetric analysis was performed utilizing cone beam-computed tomography (CBCT) after seven days of incubation...
January 2017: Journal of Conservative Dentistry: JCD
https://www.readbyqxmd.com/read/28760037/mini-open-anterior-approach-for-cervicothoracic-junction-fracture-technical-note
#13
Junichi Ohya, David P Bray, Stephen T Magill, Todd D Vogel, Sigurd Berven, Praveen V Mummaneni
Elderly patients with diffuse idiopathic skeletal hyperostosis are at high risk for falls, and 3-column unstable fractures present multiple challenges. Unstable fractures across the cervicothoracic junction are associated with significant morbidity and require fixation, which is commonly performed through a posterior open or percutaneous approach. The authors describe a novel, navigated, mini-open anterior approach using intraoperative cone-beam CT scanning to place lag screws followed by an anterior plate in a 97-year-old patient...
August 2017: Neurosurgical Focus
https://www.readbyqxmd.com/read/28756200/erbb4-protects-against-neuronal-apoptosis-via-activation-of-yap-pik3cb-signaling-pathway-in-a-rat-model-of-subarachnoid-hemorrhage
#14
Feng Yan, Xiaoxiao Tan, Weifeng Wan, Brandon J Dixon, Ruiming Fan, Budbazar Enkhjargal, Qian Li, Jianmin Zhang, Gao Chen, John H Zhang
Neuronal apoptosis is a central pathological process in subarachnoid hemorrhage (SAH)-induced early brain injury. Previous studies indicated that ErbB4 (EGFR family member v-erb-b2 avian erythroblastic leukemia viral oncogene homolog 4) is essential for normal development and maintenance of the nervous system. In this study, we explored the neuroprotective effects of ErbB4 and its downstream YAP (yes-associated protein)/PIK3CB signaling pathway in early brain injury after SAH in a rat model using the endovascular perforation method...
July 27, 2017: Experimental Neurology
https://www.readbyqxmd.com/read/28753352/instability-of-agyrotropic-electron-beams-near-the-electron-diffusion-region
#15
D B Graham, Yu V Khotyaintsev, A Vaivads, C Norgren, M André, J M Webster, J L Burch, P-A Lindqvist, R E Ergun, R B Torbert, W R Paterson, D J Gershman, B L Giles, W Magnes, C T Russell
During a magnetopause crossing the Magnetospheric Multiscale spacecraft encountered an electron diffusion region (EDR) of asymmetric reconnection. The EDR is characterized by agyrotropic beam and crescent electron distributions perpendicular to the magnetic field. Intense upper-hybrid (UH) waves are found at the boundary between the EDR and magnetosheath inflow region. The UH waves are generated by the agyrotropic electron beams. The UH waves are sufficiently large to contribute to electron diffusion and scattering, and are a potential source of radio emission near the EDR...
July 14, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28751073/efficacy-of-new-natural-biomodification-agents-from-anacardiaceae-extracts-on-dentin-collagen-cross-linking
#16
M A Moreira, N O Souza, R S Sousa, D Q Freitas, M V Lemos, D M De Paula, F J N Maia, D Lomonaco, S E Mazzetto, V P Feitosa
OBJECTIVES: Several polyphenols from renewable sources were surveyed for dentin biomodification. However, phenols from cashew nut shell liquid (CNSL, Anacardium occidentale) and from Aroeira (Myracrodruon urundeuva) extract have never been evaluated. The present investigation aimed to compare the dentin collagen crosslinking (biomodification) effectiveness of polyphenols from Aroeira stem bark extract, proanthocyanidins (PACs) from grape-seed extract (Vitis vinifera), cardol and cardanol from CNSL after clinically relevant treatment for one minute...
July 24, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28747805/an-atomic-carbon-source-for-high-temperature-molecular-beam-epitaxy-of-graphene
#17
J D Albar, A Summerfield, T S Cheng, A Davies, E F Smith, A N Khlobystov, C J Mellor, T Taniguchi, K Watanabe, C T Foxon, L Eaves, P H Beton, S V Novikov
We report the use of a novel atomic carbon source for the molecular beam epitaxy (MBE) of graphene layers on hBN flakes and on sapphire wafers at substrate growth temperatures of ~1400 °C. The source produces a flux of predominantly atomic carbon, which diffuses through the walls of a Joule-heated tantalum tube filled with graphite powder. We demonstrate deposition of carbon on sapphire with carbon deposition rates up to 12 nm/h. Atomic force microscopy measurements reveal the formation of hexagonal moiré patterns when graphene monolayers are grown on hBN flakes...
July 26, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28742061/test-study-of-boron-nitride-as-a-new-detector-material-for-dosimetry-in-high-energy-photon-beams
#18
Daniela Poppinga, Jannik Halbur, Sarah Lemmer, Bjoern Delfs, Dietrich Harder, Hui Khee Looe, Bjoern Poppe
The aim of this test study is to check whether boron nitride (BN) might be applied as a detector material in high energy photon-beam dosimetry. Boron nitride is a compound of boron and nitrogen and exists in various crystalline forms. Hexagonal boron nitride (h-BN) possesses high mobility of the electrons and holes as well as a high volume resistivity, so that ionizing radiation in the clinical range of the dose rate can be expected to produce a measurable electrical current at low background current. Due to the low atomic numbers of its atomic constituents, its density (2...
July 25, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28741348/super-resolution-far-field-infrared-imaging-by-photothermal-heterodyne-imaging
#19
Zhongming Li, Kyle Aleshire, Masaru Kuno, Gregory V Hartland
Infrared (IR) imaging provides chemical-specific information without the need for exogenous labels. Conventional far-field IR imaging techniques are diffraction limited, which means an effective spatial resolution of > 5 μm with currently available optics. In this paper we present a novel far-field IR imaging technique based on photothermal heterodyne imaging (IR-PHI). In our version of IR-PHI an IR pump laser excites the sample, causing a small temperature rise that is detected by a counter-propagating visible probe beam...
July 25, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28740916/acr-appropriateness-criteria-%C3%A2-external-beam-radiation-therapy-treatment-planning-for-clinically-localized-prostate-cancer-part-i-of-ii
#20
REVIEW
Nicholas G Zaorsky, Timothy N Showalter, Gary A Ezzell, Paul L Nguyen, Dean G Assimos, Anthony V D'Amico, Alexander R Gottschalk, Gary S Gustafson, Sameer R Keole, Stanley L Liauw, Shane Lloyd, Patrick W McLaughlin, Benjamin Movsas, Bradley R Prestidge, Al V Taira, Neha Vapiwala, Brian J Davis
No abstract text is available yet for this article.
January 2017: Advances in Radiation Oncology
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