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https://www.readbyqxmd.com/read/28345710/desktop-nmr-for-structure-elucidation-and-identification-of-strychnine-adulteration
#1
Kawarpal Singh, Bernhard Blümich
Elucidating the structure of complex molecules is difficult at low magnetic fields due to the overlap of different peak multiplets and second-order coupling effects. This is even more challenging for rigid molecules with small chemical shift differences and with prochiral centers. Since low-field NMR spectroscopy is sometimes presumed as restricted to the analysis of only small and simple molecules, this paper aims at countering this misconception: it demonstrates the use of low-field NMR spectroscopy in chemical forensics for identifying strychnine and its counterions by exploring the chemical shift as a signature in different 1D (1)H and (13)C experiments...
March 27, 2017: Analyst
https://www.readbyqxmd.com/read/28345705/activating-efficient-room-temperature-phosphorescence-of-carbon-dots-by-synergism-of-orderly-non-noble-metals-and-dual-structural-confinements
#2
Li Qian Bai, Ning Xue, Xin Rui Wang, Wen Ying Shi, Chao Lu
Obtaining high efficiency room temperature phosphorescence (RTP) by employing non-noble metals poses two challenges: (1) strengthening spin-orbit coupling of excitons to improve the rate of intersystem crossing (ISC) by using non-noble metals with small-atomic-number; (2) employing structural confinement to enhance radiation relaxation because harsh conditions, including carefully selected matrices, rigid solid-state crystalline structure and low temperature, are commonly needed. Here, layered double hydroxides (LDHs) with orderly non-noble metal arrangements were used as an inorganic matrix to activate RTP of carbon dots (CDs)...
March 27, 2017: Nanoscale
https://www.readbyqxmd.com/read/28345685/-carbon-nanotubes-characteristic-of-the-substance-biological-effects-and-occupational-exposure-levels
#3
REVIEW
Anna Maria Świdwińska-Gajewska, Sławomir Czerczak
Carbon nanotubes (CNTs) are a diverse group of nano-objects in terms of structure, size (length, diameter), shape and characteristics. The growing interest in these structures is due to the increasing number of people working in exposure to CNTs. Occupational exposure to carbon nanotubes may occur in research laboratories, as well as in plants producing CNTs and their nanocomposites. Carbon nanotubes concentration at the emission source may reach 107 particles/cm<sup>3</sup>. These values, however, are considerably reduced after the application of adequate ventilation...
March 24, 2017: Medycyna Pracy
https://www.readbyqxmd.com/read/28345303/arterial-ageing-from-endothelial-dysfunction-to-vascular-calcification
#4
M Tesauro, A Mauriello, V Rovella, M Annicchiarico-Petruzzelli, C Cardillo, G Melino, N Di Daniele
Complex structural and functional changes occur in the arterial system with advancing age. The aged artery is characterized by changes in microRNA expression patterns, autophagy, smooth muscle cell migration and proliferation, and arterial calcification with progressively increased mechanical vessel rigidity and stiffness. With age the vascular smooth muscle cells modify their phenotype from contractile to 'synthetic' determining the development of intimal thickening as early as the second decade of life as an adaptive response to forces acting on the arterial wall...
March 27, 2017: Journal of Internal Medicine
https://www.readbyqxmd.com/read/28345148/fast-self-healing-of-polyelectrolyte-multilayer-nanocoating-and-restoration-of-super-oxygen-barrier
#5
Yixuan Song, Kevin P Meyers, Joseph Gerringer, Ramesh K Ramakrishnan, Mohammad Humood, Shuang Qin, Andreas A Polycarpou, Sergei Nazarenko, Jaime C Grunlan
A self-healable gas barrier nanocoating, which is fabricated by alternate deposition of polyethyleneimine (PEI) and polyacrylic acid (PAA) polyelectrolytes, is demonstrated in this study. This multilayer film, with high elastic modulus, high glass transition temperature, and small free volume, has been shown to be a super oxygen gas barrier. An 8-bilayer PEI/PAA multilayer assembly (≈700 nm thick) exhibits an oxygen transmission rate (OTR) undetectable to commercial instrumentation (<0.005 cc (m(-2) d(-1) atm(-1) ))...
March 27, 2017: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/28345071/jolt-accentuation-and-its-value-as-a-sign-in-diagnosis-of-meningitis-in-patients-with-fever-and-headache
#6
Mani Mofidi, Narges Negaresh, Davood Farsi, Mahdi Rezai, Babak Mahshidfar, Saeed Abbasi, Peyman Hafezimoghadam
OBJECTIVES: Meningitis is an important disease among the patients being visited in Emergency Departments (EDs). There are many signs to diagnose it with different sensitivity and specificity reported in previously done studies. Current study tries to evaluate diagnostic accuracy of "Jolt accentuation" in the diagnosis (Dx.) of meningitis in patients with fever and headache. MATERIALS AND METHODS: 48 adult patients, who were referred to two teaching EDs for fever and headache and were diagnosed as suspected meningitis, were included in this prospective observational study...
March 2017: Turkish Journal of Emergency Medicine
https://www.readbyqxmd.com/read/28344605/a-method-to-incorporate-interstitial-components-into-the-tps-gynecologic-rigid-applicator-library
#7
Antonio Otal, Jose Richart, Silvia Rodriguez, Manuel Santos, Jose Perez-Calatayud
PURPOSE: T2 magnetic resonance imaging (MRI) is recommended as the imaging modality for image-guided brachytherapy. In locally advanced cervical carcinoma, combined endocavitary and interstitial applicators are appropriate (Vienna or Utrecht). To cover extensive disease, Template Benidorm (TB) was developed. Treatment planning system applicator libraries are currently unavailable for the Utrecht applicator or the TB. The purpose of this work is to develop an applicator library for both applicators...
February 2017: Journal of Contemporary Brachytherapy
https://www.readbyqxmd.com/read/28344598/radiation-dose-to-the-left-anterior-descending-coronary-artery-during-interstitial-pulsed-dose-rate-brachytherapy-used-as-a-boost-in-breast-cancer-patients-undergoing-organ-sparing-treatment
#8
Marcin Sinacki, Krystyna Serkies, Rafał Dziadziuszko, Magdalena Narkowicz, Joanna Kamińska, Joanna Lipniewicz
PURPOSE: To assess dose received by the left anterior descending (LAD) coronary artery during interstitial pulsed-dose-rate brachytherapy (PDR-BT) boost for left-sided breast cancer patients undergoing organ-sparing treatment. MATERIAL AND METHODS: Thirty consecutive pT1-3N0-1M0 breast cancer patients boosted between 2014 and 2015 with 10 Gy/10 pulses/hour PDR-BT following a computed tomography (CT) simulation with the multi-catheter implant were included. The most common localization of primary tumor were upper quadrants...
February 2017: Journal of Contemporary Brachytherapy
https://www.readbyqxmd.com/read/28343809/in%C3%A2-vivo-analysis-of-dynamic-graft-bending-angle-in-anterior-cruciate-ligament-reconstructed-knees-during-downward-running-and-level-walking-comparison-of-flexible-and-rigid-drills-for-transportal-technique
#9
Yasutaka Tashiro, Vani Sundaram, Eric Thorhauer, Tom Gale, William Anderst, James J Irrgang, Freddie H Fu, Scott Tashman
PURPOSE: To determine the in vivo dynamic graft bending angle (GBA) in anterior cruciate ligament (ACL)-reconstructed knees, correlate the angle to tunnel positions and tunnel widening, and evaluate the effects of 2 femoral tunnel drilling techniques on GBA. METHODS: Patients with an isolated ACL injury undergoing reconstruction from 2011 to 2012 were included. Transportal techniques were used to create femoral tunnels. Tunnel locations were determined by 3-dimensional computed tomography...
March 23, 2017: Arthroscopy: the Journal of Arthroscopic & related Surgery
https://www.readbyqxmd.com/read/28343360/tsunami-run-up-and-inundation-along-the-coast-of-sabah-and-sarawak-malaysia-due-to-a-potential-brunei-submarine-mass-failure
#10
Wai Kiat Tan, Su Yean Teh, Hock Lye Koh
Submarine landslides, also known as submarine mass failures (SMFs), are major natural marine disasters that could critically damage coastal facilities such as nuclear power plants and oil and gas platforms. It is therefore essential to investigate submarine landslides for potential tsunami hazard assessment. Three-dimensional seismic data from offshore Brunei have revealed a giant seabed mass deposited by a previous SMF. The submarine mass extends over 120 km from the continental slope of the Baram Canyon at 200 m water depth to the deep basin floor of the Northwest Borneo Trough...
March 25, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28343303/can-real-time-rgbd-enhance-intraoperative-cone-beam-ct
#11
Javad Fotouhi, Bernhard Fuerst, Wolfgang Wein, Nassir Navab
PURPOSE: Cone-Beam Computed Tomography (CBCT) is an important 3D imaging technology for orthopedic, trauma, radiotherapy guidance, angiography, and dental applications. The major limitation of CBCT is the poor image quality due to scattered radiation, truncation, and patient movement. In this work, we propose to incorporate information from a co-registered Red-Green-Blue-Depth (RGBD) sensor attached near the detector plane of the C-arm to improve the reconstruction quality, as well as correcting for undesired rigid patient movement...
March 25, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28342975/biomechanical-testing-of-a-peek-based-dynamic-instrumentation-device-in-a-lumbar-spine-model
#12
Christian Herren, Agnes Beckmann, Sabine Meyer, Miguel Pishnamaz, Marion Mundt, Rolf Sobottke, Andreas Prescher, Marcus Stoffel, Bernd Markert, Philipp Kobbe, Hans-Christoph Pape, Peer Eysel, Jan Siewe
BACKGROUND: The purpose of this study was to investigate the range-of-motion after posterior polyetheretherketone-based rod stabilisation combined with a dynamic silicone hinge in order to compare it with titanium rigid stabilisation. METHODS: Five human cadaveric lumbar spines with four vertebra each (L2 to L5) were tested in a temperature adjustable spine-testing set-up in four trials: (1) native measurement; (2) kinematics after rigid monosegmental titanium rod instrumentation with anterior intervertebral bracing of the segment L4/5; (3) kinematics after hybrid posterior polyetheretherketone rod instrumentation combined with a silicone hinge within the adjacent level (L3/4) and (4) kinematics after additional decompression with laminectomy of L4 and bilateral resection of the inferior articular processes (L3)...
March 18, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28342545/distal-tibial-nonunion-using-a-contralateral-anterior-l-shaped-locking-compression-plate-through-a-posterior-lateral-approach-a-retrospective-case-series
#13
Chuanlu Lin, Lixiang Lin, Lutchooman Vinesh, Xiwen Shao, Xiaolang Lu, Jianjun Hong
BACKGROUND: Distal tibial nonunion is usually due to severe open distal tibial fractures with high energy injury. The best surgical treatment is not well established because of the poor soft tissue condition. We retrospectively analyzed a series of patients with distal tibial nonunion after severe open distal tibial fractures; our purpose was to introduce a treatment using a contralateral anterior L-shaped locking compression plate through a posterior-lateral approach with Iliac crest bone graft and evaluate the outcomes of patients...
March 19, 2017: Injury
https://www.readbyqxmd.com/read/28342242/a-systematic-analysis-of-scoring-functions-in-rigid-body-protein-docking-the-delicate-balance-between-the-predictive-rate-improvement-and-the-risk-of-overtraining
#14
Didier Barradas-Bautista, Iain H Moal, Juan Fernández-Recio
Protein-protein interactions play fundamental roles in biological processes including signaling, metabolism and trafficking. While the structure of a protein complex reveals crucial details about the interaction, it is often difficult to acquire this information experimentally. As the number of interactions discovered increases faster than they can be characterized, protein-protein docking calculations may be able to reduce this disparity by providing models of the interacting proteins. Rigid-body docking is a widely used docking approach, and is often capable of generating a pool of models within which a near-native structure can be found...
March 25, 2017: Proteins
https://www.readbyqxmd.com/read/28340906/veterans-treatment-courts-a-case-study-of-their-efficacy-for-veterans-needs
#15
John W Erickson
Veterans Treatment Courts (VTCs) were created to: (1) address issues unique to U.S. Military Veterans; and, (2) where possible, avoid punishing veterans for crimes that may have been committed as a direct result of their mental conditions (e.g., Posttraumatic Stress Disorder (PTSD) and/or Traumatic Brain Injury (TBI)). Little research has been undertaken to ascertain whether VTCs are accomplishing their intended goals. To that end, the present case study examined three operating VTCs in order to determine if they are meeting their objectives...
November 2016: International Journal of Law and Psychiatry
https://www.readbyqxmd.com/read/28339236/effect-of-biaxial-strain-on-the-phase-transitions-of-ca-fe_-1-x-co_-x-_-2-as_-2
#16
A E Böhmer, A Sapkota, A Kreyssig, S L Bud'ko, G Drachuck, S M Saunders, A I Goldman, P C Canfield
We study the effect of applied strain as a physical control parameter for the phase transitions of Ca(Fe_{1-x}Co_{x})_{2}As_{2} using resistivity, magnetization, x-ray diffraction, and ^{57}Fe Mössbauer spectroscopy. Biaxial strain, namely, compression of the basal plane of the tetragonal unit cell, is created through firm bonding of samples to a rigid substrate via differential thermal expansion. This strain is shown to induce a magnetostructural phase transition in originally paramagnetic samples, and superconductivity in previously nonsuperconducting ones...
March 10, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28338623/a-study-of-intramolecular-hydrogen-bonding-in-levoglucosan-derivatives
#17
Lucas Quiquempoix, Elena Bogdan, Neil J Wells, Jean-Yves Le Questel, Jérôme Graton, Bruno Linclau
Organofluorine is a weak hydrogen-bond (HB) acceptor. Bernet et al. have demonstrated its capability to perturb OH···O intramolecular hydrogen bonds (IMHBs), using conformationally rigid carbohydrate scaffolds including levoglucosan derivatives. These investigations are supplemented here by experimental and theoretical studies involving six new levoglucosan derivatives, and complement the findings of Bernet et al. However, it is shown that conformational analysis is instrumental in interpreting the experimental data, due to the occurrence of non-intramolecular hydrogen-bonded populations which, although minor, cannot be neglected and appears surprisingly significant...
March 24, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28338607/how-to-make-reliable-washable-and-wearable-textronic-devices
#18
Xuyuan Tao, Vladan Koncar, Tzu-Hao Huang, Chien-Lung Shen, Ya-Chi Ko, Gwo-Tsuen Jou
In this paper, the washability of wearable textronic (textile-electronic) devices has been studied. Two different approaches aiming at designing, producing, and testing robust washable and reliable smart textile systems are presented. The common point of the two approaches is the use of flexible conductive PCB in order to interface the miniaturized rigid (traditional) electronic devices to conductive threads and tracks within the textile flexible fabric and to connect them to antenna, textile electrodes, sensors, actuators, etc...
March 24, 2017: Sensors
https://www.readbyqxmd.com/read/28338574/rigid-occipitocervical-instrumented-fusion-for-atlantoaxial-instability-in-an-18-month-old-toddler-with-brachytelephalangic-chondrodysplasia-punctata-a-case-report
#19
Hiroki Oba, Jun Takahashi, Kyoko Takano, Yuji Inaba, Mitsuo Motobayashi, Gen Nishimura, Shugo Kuraishi, Masayuki Shimizu, Shota Ikegami, Toshimasa Futatsugi, Masashi Uehara, Tomoki Kosho, Hiroyuki Kato, Koki Uno
STUDY DESIGN: Case report OBJECTIVE.: We report here on an 18-month-old boy with brachytelephalangic chondrodysplasia punctata (BCDP), whose atlantoaxial instability was successfully managed with occipitocervical instrumented fusion (OCF) using screw and rod instrumentations. SUMMARY OF BACKGROUND DATA: Recently, there have been a number of reports on BCDP with early onset of cervical myelopathy. Surgical OCF is a vital intervention to salvage affected individuals from the life-threatening morbidity...
March 23, 2017: Spine
https://www.readbyqxmd.com/read/28338151/field-theoretic-simulations-of-random-copolymers-with-structural-rigidity
#20
Shifan Mao, Quinn MacPherson, Jian Qin, Andrew J Spakowitz
Copolymers play an important role in a range of soft-materials applications and biological phenomena. Prevalent works on block copolymer phase behavior use flexible chain models and incorporate interactions using a mean-field approximation. However, when phase separation takes place on length scales comparable to a few monomers, the structural rigidity of the monomers becomes important. In addition, concentration fluctuations become significant at short length scales, rendering the mean-field approximation invalid...
March 24, 2017: Soft Matter
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