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https://www.readbyqxmd.com/read/28931280/stereodynamic-quinone-hydroquinone-molecules-that-enantiomerize-at-sp3-carbon-via-redox-interconversion
#1
Byoungmoo Kim, Golo Storch, Gourab Banerjee, Brandon Q Mercado, Janelle Castillo-Lora, Gary W Brudvig, James M Mayer, Scott J Miller
Since the discovery of molecular chirality, non-superimposable mirror-image organic molecules have been found to be essential across biological, chemical processes, and increasingly in materials science.  Generally, carbon centers containing four different substituents are configurationally stable, unless bonds to the stereogenic carbon atom are broken and reformed. Herein, we describe sp3-stereogenic carbon-bearing molecules that dynamically isomerize, interconverting between enantiomers without cleavage of a constituent bond, nor through remote functional group migration...
September 20, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28930456/metformin-an-anthropogenic-contaminant-of-seidlitzia-rosmarinus-collected-in-a-desert-region-near-the-gulf-of-aqaba-sinai-peninsula
#2
Ahmed R Hassan, Salah M El-Kousy, Sayed A El-Toumy, Karla Frydenvang, Truong Thanh Tung, Jesper Olsen, John Nielsen, Søren Brøgger Christensen
A phytochemical investigation of Seidlitzia rosmarinus collected along the shoreline of the Gulf of Aqaba in the remote southern desert region of the Sinai peninsula has revealed the presence of the registered drug metformin (4). However, analysis of the (14)C content revealed the drug to be an anthropogenic contaminant. Consequently, natural product researchers should be aware that compounds isolated from plants might originate from environmental contamination rather than biosynthesis. The new natural product N-(4-hydroxyphenylethyl)-α-chloroferuloylamide was isolated as a mixture of the E and Z isomers along with a number of other well-established secondary metabolites...
September 20, 2017: Journal of Natural Products
https://www.readbyqxmd.com/read/28928720/potential-risk-areas-of-aedes-albopictus-in-south-eastern-iran-a-vector-of-dengue-fever-zika-and-chikungunya
#3
Jalil Nejati, Rubén Bueno-Marí, Francisco Collantes, Ahmad A Hanafi-Bojd, Hassan Vatandoost, Zabihollah Charrahy, Seyed M Tabatabaei, Mohammad R Yaghoobi-Ershadi, Abdolghafar Hasanzehi, Mohammad R Shirzadi, Seyed H Moosa-Kazemi, Mohammad M Sedaghat
The possibility of the rapid and global spread of Zika, chikungunya, yellow fever, and dengue fever by Aedes albopictus is well documented and may be facilitated by changes in climate. To avert and manage health risks, climatic and topographic information can be used to model and forecast which areas may be most prone to the establishment of Ae. albopictus. We aimed to weigh and prioritize the predictive value of various meteorological and climatic variables on distributions of Ae. albopictus in south-eastern Iran using the Analytical Hierarchy Process...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28928575/referrral-systems-development-and-survey-of-perioperative-and-critical-care-referral-to-anesthetists
#4
P L Narendra, Harihar V Hegde, Maroof Ahmad Khan, Dayanand G Talikoti, Samson Nallamilli
INTRODUCTION: Anesthetists come in contact with more than two-third of hospital patients. Timely referral to anesthetists is vital in perioperative and remote site settings. Delayed referrals, improper referrals, and referrals at inappropriate levels can result in inadequate preparation, perioperative complications, and poor outcome. METHODS: The self administered paper survey to delegates attending anesthesia conferences. Questions were asked on how high-risk, emergency surgical cases remote site and critical care patients were referred to anesthetists and presence of rapid response teams...
July 2017: Anesthesia, Essays and Researches
https://www.readbyqxmd.com/read/28921954/remote-late-stage-oxidation-of-aliphatic-c-h-bonds-in-amide-containing-molecules
#5
Takeshi Nanjo, Emilio Carlos de Lucca, M Christina White
Amide-containing molecules are ubiquitous in natural products, pharmaceuticals, and materials science. Due to their intermediate electron-richness, they are not amenable to any of the previously developed N-protection strategies known to enable remote aliphatic C-H oxidations. Using information gleaned from a systematic study of the main features that makes remote oxidations of amides in peptide settings possible, we developed an imidate salt protecting strategy that employs methyl trifluoromethanesulfonate (MeOTf) as a reversible alkylating agent...
September 18, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28921552/immunomodulatory-effect-of-cryopreserved-platelets-altered-bdca3-dendritic-cell-maturation-and-activation-in-vitro
#6
Katrina K Ki, Lacey Johnson, Helen M Faddy, Robert L Flower, Denese C Marks, Melinda M Dean
BACKGROUND: Cryopreservation of platelets (PLTs) is useful in remote areas to overcome logistic problems associated with supply and can extend the shelf life to 2 years. During cryopreservation, properties of PLTs are modified. Whether changes in the cryopreserved PLT (CPP) product are associated with modulation of recipients' immune function is unknown. We aimed to characterize the immune profile of myeloid dendritic cells (mDCs) and the specialized blood DC antigen (BDCA)3(+) subset after exposure to CPPs...
September 16, 2017: Transfusion
https://www.readbyqxmd.com/read/28904763/winter-bait-stations-as-a-multispecies-survey-tool
#7
Lacy Robinson, Samuel A Cushman, Michael K Lucid
Winter bait stations are becoming a commonly used technique for multispecies inventory and monitoring but a technical evaluation of their effectiveness is lacking. Bait stations have three components: carcass attractant, remote camera, and hair snare. Our 22,975 km(2) mountainous study area was stratified with a 5 × 5 km sampling grid centered on northern Idaho and including portions of Washington, Montana, and British Columbia. From 2010-14, we conducted 563 sampling sessions at 497 bait stations in 453 5 × 5 km cells...
September 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28901631/equine-behavioral-enrichment-toys-as-tools-for-non-invasive-recovery-of-viral-and-host-dna
#8
Peter A Seeber, Sanatana E Soilemetzidou, Marion L East, Chris Walzer, Alex D Greenwood
Direct collection of samples from wildlife can be difficult and sometimes impossible. Non-invasive remote sampling for the purpose of DNA extraction is a potential tool for monitoring the presence of wildlife at the individual level, and for identifying the pathogens shed by wildlife. Equine herpesviruses (EHV) are common pathogens of equids that can be fatal if transmitted to other mammals. Transmission usually occurs by nasal aerosol discharge from virus-shedding individuals. The aim of this study was to validate a simple, non-invasive method to track EHV shedding in zebras and to establish an efficient protocol for genotyping individual zebras from environmental DNA (eDNA)...
September 12, 2017: Zoo Biology
https://www.readbyqxmd.com/read/28900152/a-3d-magnetic-tissue-stretcher-for-remote-mechanical-control-of-embryonic-stem-cell-differentiation
#9
Vicard Du, Nathalie Luciani, Sophie Richard, Gaëtan Mary, Cyprien Gay, François Mazuel, Myriam Reffay, Philippe Menasché, Onnik Agbulut, Claire Wilhelm
The ability to create a 3D tissue structure from individual cells and then to stimulate it at will is a major goal for both the biophysics and regenerative medicine communities. Here we show an integrated set of magnetic techniques that meet this challenge using embryonic stem cells (ESCs). We assessed the impact of magnetic nanoparticles internalization on ESCs viability, proliferation, pluripotency and differentiation profiles. We developed magnetic attractors capable of aggregating the cells remotely into a 3D embryoid body...
September 12, 2017: Nature Communications
https://www.readbyqxmd.com/read/28898465/polar-electrode-bridged-electroluminescent-displays-2d-sensors-remotely-communicating-optically
#10
Xiuru Xu, Dan Hu, Lijia Yan, Shaoli Fang, Clifton Shen, Yueh-Lin Loo, Yuan Lin, Carter S Haines, Na Li, Anvar A Zakhidov, Hong Meng, Ray H Baughman, Wei Huang
A novel geometry for electroluminescent devices, which does not require transparent electrodes for electrical input, is demonstrated, theoretically analyzed, and experimentally characterized. Instead of emitting light through a conventional electrode, light emission occurs through a polar liquid or solid and input electrical electrodes are coplanar, rather than stacked in a sandwich configuration. This new device concept is scalable and easily deployed for a range of modular alternating-current-powered electroluminescent light sources and light-emitting sensing devices...
September 12, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28883544/global-fibroblast-activation-throughout-the-left-ventricle-but-localized-fibrosis-after-myocardial-infarction
#11
Chandan K Nagaraju, Eef Dries, Natasa Popovic, Abhishek A Singh, Peter Haemers, H Llewelyn Roderick, Piet Claus, Karin R Sipido, Ronald B Driesen
Fibroblast (Fb) differentiation and interstitial fibrosis contribute to cardiac remodeling and loss of function after myocardial infarction (MI). We investigated regional presence and regulation of fibrosis in a pig MI model. In vivo analysis of regional function and perfusion defined three regions: the scar, the myocardium adjacent to the scar (MIadjacent, reduced function, reduced perfusion reserve), and the remote myocardium (MIremote, minimal functional deficit, maintained perfusion). Interstitial and perivascular fibrosis, and increase of collagen type I, was only observed in the MIadjacent...
September 7, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28883041/normoxic-cells-remotely-regulate-the-acid-base-balance-of-cells-at-the-hypoxic-core-of-connexin-coupled-tumor-growths
#12
Tobias H Dovmark, Alzbeta Hulikova, Steven A Niederer, Richard D Vaughan-Jones, Pawel Swietach
ATP fuels the removal of metabolic end-products, including H(+) ions that profoundly modulate biological activities. Energetic resources in hypoxic tumor regions are constrained by low-yielding glycolysis, and any means of reducing the cost of acid extrusion, without compromising pH homeostasis, would therefore be advantageous for cancer cells. Some cancers express connexin channels that allow solute exchange between cells, and we propose that, via this route, normoxic cells supply hypoxic neighbors with acid-neutralizing HCO3(-) ions...
September 7, 2017: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
https://www.readbyqxmd.com/read/28882716/remote-thoracic-myelopathy-from-a-spinal-dural-arteriovenous-fistula-at-the-cranio-cervical-junction-case-report-and-review-of-literature
#13
Michael J Lang, Stavropoula Tjoumakaris, Robert H Rosenwasser, Pascal Jabbour
BACKGROUND: The cranio-cervical junction is a rare location for spinal dural arteriovenous fistulas (dAVF). Typically, fistulas at this location present with findings related to intracranial cortical venous reflux or with cervical myelopathy. We present a case of cranio-cervical junction dAVF with isolated clinical and radiographic findings of thoracolumbar myelopathy. CASE DESCRIPTION: A 54 year-old male presented with subacute onset of lower extremity weakness, paresthesias and gait dysfunction...
September 4, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28882272/using-interactive-virtual-presence-to-support-accurate-installation-of-child-restraints-efficacy-and-parental-perceptions
#14
David C Schwebel, M Alison Tillman, Marie Crew, Matthew Muller, Anna Johnston
INTRODUCTION: Child restraint systems (car seats) reduce injury risk for young children involved in motor-vehicle crashes, but parents experience significant difficulty installing child restraints correctly. Installation by certified child passenger safety (CPS) technicians yields more accurate installation, but is impractical for broad distribution. A potential solution is use of interactive virtual presence via smartphone application (app), which permits "hands on" teaching through simultaneous and remote joint exposure to 3-dimensional images...
September 2017: Journal of Safety Research
https://www.readbyqxmd.com/read/28878428/elimination-of-guinea-worm-disease-in-ethiopia-current-status-of-the-disease-s-eradication-strategies-and-challenges-to-the-end-game
#15
Habtamu Bedimo Beyene, Abyot Bekele, Amanu Shifara, Yehenew A Ebstie, Zelalem Desalegn, Zeyede Kebede, Abate Mulugeta, Kebede Deribe, Zerihun Tadesse, Tamrat Abebe, Biruck Kebede, Getaneh Abrha, Daddi Jima
Dracunculiasis, also named Guinea Worm Disease (GWD), is one of the Neglected Tropical Diseases (NTDs) caused by a parasitic nematode known as Dracunculus medinensis and has been known since antiquity as 'fiery serpent' from Israelites. It is transmitted to humans via drinking contaminated water containing infective copepods. Given, its feasibility for eradication, the Guinea Worm Eradication Program (GWEP) was launched in 1980 with the aim of eradicating the disease. Since its inception, GWEP has made an extraordinary progress in interrupting transmission...
2017: Ethiopian Medical Journal
https://www.readbyqxmd.com/read/28877344/development-of-a-3d-remote-dosimetry-protocol-compatible-with-mrgimrt
#16
Stewart Mein, Leith Rankine, John Adamovics, Harold Li, Mark Oldham
PURPOSE: To develop a novel remote 3D dosimetry protocol to verify Magnetic Resonance-guided Radiation Therapy (MRgRT) treatments. The protocol was applied to investigate the accuracy of TG-119 IMRT irradiations delivered by the MRIdian(®) system (ViewRay(®) , Oakwood Village, Ohio) allowing for a 48 hour delay between irradiation at a field institution and subsequent readout at a base institution. METHODS: The 3D dosimetry protocol utilizes a novel formulation of PRESAGE(®) radiochromic dosimeters developed for high post-irradiation stability and compatibility with optical-CT readout...
September 6, 2017: Medical Physics
https://www.readbyqxmd.com/read/28875085/remote-sensing-and-spatial-statistical-techniques-for-modelling-ommatissus-lybicus-hemiptera-tropiduchidae-habitat-and-population-densities
#17
Khalifa M Al-Kindi, Paul Kwan, Nigel R Andrew, Mitchell Welch
In order to understand the distribution and prevalence of Ommatissus lybicus (Hemiptera: Tropiduchidae) as well as analyse their current biographical patterns and predict their future spread, comprehensive and detailed information on the environmental, climatic, and agricultural practices are essential. The spatial analytical techniques such as Remote Sensing and Spatial Statistics Tools, can help detect and model spatial links and correlations between the presence, absence and density of O. lybicus in response to climatic, environmental, and human factors...
2017: PeerJ
https://www.readbyqxmd.com/read/28874906/megafauna-of-the-uksrl-exploration-contract-area-and-eastern-clarion-clipperton-zone-in-the-pacific-ocean-annelida-arthropoda-bryozoa-chordata-ctenophora-mollusca
#18
Diva J Amon, Amanda F Ziegler, Jeffrey C Drazen, Andrei V Grischenko, Astrid B Leitner, Dhugal J Lindsay, Janet R Voight, Mary K Wicksten, Craig M Young, Craig R Smith
BACKGROUND: There is growing interest in mining polymetallic nodules from the abyssal Clarion-Clipperton Zone (CCZ) in the tropical Pacific Ocean. Despite having been the focus of environmental studies for decades, the benthic megafauna of the CCZ remain poorly known. To predict and manage the environmental impacts of mining in the CCZ, baseline knowledge of the megafauna is essential. The ABYSSLINE Project has conducted benthic biological baseline surveys in the UK Seabed Resources Ltd polymetallic-nodule exploration contract area (UK-1)...
2017: Biodiversity Data Journal
https://www.readbyqxmd.com/read/28871158/hub-driven-remote-synchronization-in-brain-networks
#19
Vladimir Vlasov, Angelo Bifone
The phenomenon of "remote synchronization" (RS), first observed in a star network of oscillators, involves synchronization of unconnected peripheral nodes through a hub that maintains independent dynamics. In the RS regime the central hub was thought to serve as a passive gate for information transfer between nodes. Here, we investigate the physical origin of this phenomenon. Surprisingly, we find that a hub node can drive remote synchronization of peripheral oscillators even in the presence of a repulsive mean field, thus actively governing network dynamics while remaining asynchronous...
September 4, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28867828/the-spectral-invariant-approximation-within-canopy-radiative-transfer-to-support-the-use-of-the-epic-dscovr-oxygen-b-band-for-monitoring-vegetation
#20
Alexander Marshak, Yuri Knyazikhin
EPIC (Earth Polychromatic Imaging Camera) is a 10-channel spectroradiometer onboard DSCOVR (Deep Space Climate Observatory) spacecraft. In addition to the near-infrared (NIR, 780 nm) and the 'red' (680 nm) channels, EPIC also has the O2 A-band (764±0.2 nm) and B-band (687.75±0.2 nm). The EPIC Normalized Difference Vegetation Index (NDVI) is defined as the difference between NIR and 'red' channels normalized to their sum. However, the use of the O2 B-band instead of the 'red' channel mitigates the effect of atmosphere on remote sensing of surface reflectance because O2 reduces contribution from the radiation scattered by the atmosphere...
April 2017: Journal of Quantitative Spectroscopy & Radiative Transfer
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