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https://www.readbyqxmd.com/read/29223118/speciation-of-chromium-compounds-from-humic-acid-zeolite-y-to-an-ionic-liquid-during-extraction
#1
Hsin-Liang Huang, Yu Jhe Wei
By synchrotron X-ray absorption spectroscopy, chemical structures of hexavalent chromium (Cr(VI))/trivalent chromium (Cr(III)) adsorbed on humic acid (HA)-zeolite Y and extracted in an ionic liquid (1-butyl-3-methylimidazolium tetrafluoroborate ([C4mim][BF4])) have been studied. By combining the competitive adsorption results and reduction of Cr(VI)-HA with the carboxyl groups of HA, Cr(III)-HA (58%) was shown to be the major compound in HA-zeolite Y using synchrotron X-ray absorption near-edge structure (XANES) spectroscopy...
November 28, 2017: Chemosphere
https://www.readbyqxmd.com/read/29223081/dispersion-of-traffic-derived-air-pollutants-into-urban-parks
#2
Yang Xing, Peter Brimblecombe
Scarce land resources in dense cities means that small urban parks are important as a leisure and amenity resource for the urban population. However, streets with heavily traffic often surround these fragmented parks and increase the potential user exposure to air pollutants from vehicles. The dispersion profiles of PM2.5 and black carbon from roadside into urban parks at pedestrian level, in Hong Kong, were measured using mobile high time resolution instruments. In the downwind direction, pollutant concentrations decreased rapidly from roadside and by some tens of metres reached relatively constant values...
December 6, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29223061/impurity-profiling-of-n-n-ethylenebis-l-cysteine-diethyl-ester-bicisate
#3
Oliver Wahl, Jan Cleynhens, Alfons M Verbruggen, Ulrike Holzgrabe
A HPLC-UV-CAD method with a HILIC column for impurity profiling of the 99mTc chelating agent bicisate has been developed and evaluated. Bicisate and its impurities were separated by means of isocratic elution on a zwitterionic stationary phase using a mixture of 7.5mmol/L trifluoroacetic acid and acetonitrile (47.5:52.5 V/V) as the mobile phase. Five different bicisate batches of a manufacturer were tested using the method. In addition LC-MS experiments were conducted in order to identify the impurities. The predominant impurities found were the oxidation product (disulfide), the monoester of ethylene dicysteine and an unknown compound with an m/z of 293 in ESI positive mode...
December 5, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/29223060/recent-advances-in-lipid-separations-and-structural-elucidation-using-mass-spectrometry-combined-with-ion-mobility-spectrometry-ion-molecule-reactions-and-fragmentation-approaches
#4
REVIEW
Xueyun Zheng, Richard D Smith, Erin S Baker
Lipids are a vital class of molecules that play important and varied roles in biological processes, however, fully understanding these roles is extremely difficult due to the immense number and diversity of possible lipid species. While recent advances in chromatography and high resolution mass spectrometry have greatly progressed knowledge about distinct lipid species and functions, effectively separating many lipids still remains problematic. Isomeric lipids have made lipid characterization especially difficult and occur due to subclasses having the same chemical composition, or species having multiple acyl chain connectivities (sn-1, sn-2, or sn-3), double bond positions and orientations (cis or trans), and functional group stereochemistries (R versus S)...
December 6, 2017: Current Opinion in Chemical Biology
https://www.readbyqxmd.com/read/29222849/bone-marrow-transplantation-improves-motor-activity-in-a-mouse-model-of-ataxia
#5
David Díaz, Marina Piquer-Gil, Javier Sánchez Recio, María Magdalena Martínez-Losa, José Ramón Alonso, Eduardo Weruaga, Manuel Álvarez-Dolado
Ataxias are locomotor disorders that can have an origin both neural and muscular, although both impairments are related. Unfortunately, ataxia has no cure and the current therapies are aimed at motor re-education or muscular reinforcement. Nevertheless, cell therapy is becoming a promising approach to deal with incurable neural diseases, including neuro-muscular ataxias. Here we have used a model of ataxia, the PCD mutant mouse, to study the effect of healthy (wild-type) bone marrow transplantation on the restoration of defective mobility...
December 8, 2017: Journal of Tissue Engineering and Regenerative Medicine
https://www.readbyqxmd.com/read/29222718/treatment-of-stress-urinary-incontinence-with-a-mobile-app-factors-associated-with-success
#6
Emma Nyström, Ina Asklund, Malin Sjöström, Hans Stenlund, Eva Samuelsson
INTRODUCTION AND HYPOTHESIS: Stress urinary incontinence is common among women. First-line treatment includes pelvic floor muscle training (PFMT) and lifestyle advice, which can be provided via a mobile app. The efficacy of app-based treatment has been demonstrated in a randomized controlled trial (RCT). In this study, we aimed to analyze factors associated with successful treatment. METHODS: Secondary analysis of data from the RCT. At baseline and 3-month follow-up, participants (n = 61) answered questions about symptoms, quality of life, background, and PFMT...
December 8, 2017: International Urogynecology Journal
https://www.readbyqxmd.com/read/29222595/-prostate-cancer-risk-calculator-mobile-applications-apps-a-systematic-review-and-scoring-using-the-validated-user-version-of-the-mobile-application-rating-scale-umars
#7
Ahmed Adam, Julian C Hellig, Marlon Perera, Damien Bolton, Nathan Lawrentschuk
PURPOSE: The use of mobile phone applications (Apps) has modernised the conventional practice of medicine. The diagnostic ability of the current Apps in prostate specific antigen monitoring, and its diagnostic ability within prostate cancer (PCa) risk calculators have not yet been appraised. We aimed to review, rate and assess the everyday functionality, and utility of all the currently available PCa risk calculator Apps. METHODS: A systematic search on iTunes, Google Play Store, Blackberry World and Windows Apps Store, was performed on 23/11/2017, using the search term 'prostate cancer risk calculator'...
December 8, 2017: World Journal of Urology
https://www.readbyqxmd.com/read/29222422/reconfigurable-yagi-uda-antenna-based-on-a-silicon-reflector-with-a-solid-state-plasma
#8
Da-Jin Kim, Jang-Soon Park, Cheol Ho Kim, Jae Hur, Choong-Ki Kim, Young-Kyun Cho, Jun-Bong Ko, Bonghyuk Park, Dongho Kim, Yang-Kyu Choi
This paper describes the fabrication and characterization of a reconfigurable Yagi-Uda antenna based on a silicon reflector with a solid-state plasma. The silicon reflector, composed of serially connected p-i-n diodes, forms a highly dense solid-state plasma by injecting electrons and holes into the intrinsic region. When this plasma silicon reflector is turned on, the front-realized gain of the antenna increases by more than 2 dBi beyond 5.3 GHz. To achieve the large gain increment, the structure of the antenna is carefully designed with the aid of semiconductor device simulation and antenna simulation...
December 8, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29222407/ballistic-geometric-resistance-resonances-in-a-single-surface-of-a-topological-insulator
#9
Hubert Maier, Johannes Ziegler, Ralf Fischer, Dmitriy Kozlov, Ze Don Kvon, Nikolay Mikhailov, Sergey A Dvoretsky, Dieter Weiss
Transport in topological matter has shown a variety of novel phenomena over the past decade. Although numerous transport studies have been conducted on three-dimensional topological insulators (TIs), study of ballistic motion and thus exploration of potential landscapes on a hundred nanometer scale is for the prevalent TI materials almost impossible due to their low carrier mobility. Therefore, it is unknown whether helical Dirac electrons in TIs, bound to interfaces between topologically distinct materials, can be manipulated on the nanometer scale by local gates or locally etched regions...
December 8, 2017: Nature Communications
https://www.readbyqxmd.com/read/29222331/a-hypertension-associated-mitochondrial-dna-mutation-introduces-an-m1g37-modification-into-trnamet-altering-its-structure-and-function
#10
Mi Zhou, Ling Xue, Yaru Chen, Haiying Li, Qiufen He, Bibin Wang, Feilong Meng, Meng Wang, Min-Xin Guan
Defective nucleotide modifications of mitochondrial tRNAs have been associated with several human diseases, but their pathophysiology remains poorly understood. In this report, we investigated the pathogenic molecular mechanism underlying a hypertension-associated 4435A>G mutation in mitochondrial tRNAMet The m.4435A>G mutation affected a highly conserved adenosine at position 37, 3' adjacent to the tRNA's anticodon, which is important for the fidelity of codon recognition and stabilization. We hypothesized that the m...
December 8, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/29222107/il-33-promotes-the-egress-of-group-2-innate-lymphoid-cells-from-the-bone-marrow
#11
Matthew T Stier, Jian Zhang, Kasia Goleniewska, Jacqueline Y Cephus, Mark Rusznak, Lan Wu, Luc Van Kaer, Baohua Zhou, Dawn C Newcomb, R Stokes Peebles
Group 2 innate lymphoid cells (ILC2s) are effector cells within the mucosa and key participants in type 2 immune responses in the context of allergic inflammation and infection. ILC2s develop in the bone marrow from common lymphoid progenitor cells, but little is known about how ILC2s egress from the bone marrow for hematogenous trafficking. In this study, we identified a critical role for IL-33, a hallmark peripheral ILC2-activating cytokine, in promoting the egress of ILC2 lineage cells from the bone marrow...
December 8, 2017: Journal of Experimental Medicine
https://www.readbyqxmd.com/read/29222078/texting-condolences-adapting-mhealth-programs-after-unexpected-pregnancy-and-infant-outcomes
#12
Jennifer A Unger, John Kinuthia, Grace John-Stewart
Mobile health (mHealth) short message system (SMS) interventions for maternal and child health (MCH) are being implemented globally. In many low- and middle-income settings in which these mHealth interventions are being rolled out, stillbirths and neonatal and infant deaths are common. It is important that mHealth solutions do not exacerbate emotional stress and pain by continuing with routine messaging for pregnancy or infant care when someone has experienced loss. In this brief viewpoint paper, we argue that SMS programs for maternal and child health need to adapt and make available messaging for miscarriage, stillbirth, and infant loss...
December 8, 2017: JMIR MHealth and UHealth
https://www.readbyqxmd.com/read/29222075/examining-tensions-that-affect-the-evaluation-of-technology-in-health-care-considerations-for-system-decision-makers-from-the-perspective-of-industry-and-evaluators
#13
Laura Desveaux, James Shaw, Ross Wallace, Onil Bhattacharyya, R Sacha Bhatia, Trevor Jamieson
Virtual technologies have the potential to mitigate a range of challenges for health care systems. Despite the widespread use of mobile devices in everyday life, they currently have a limited role in health service delivery and clinical care. Efforts to integrate the fast-paced consumer technology market with health care delivery exposes tensions among patients, providers, vendors, evaluators, and system decision makers. This paper explores the key tensions between the high bar for evidence prior to market approval that guides health care regulatory decisions and the "fail fast" reality of the technology industry...
December 8, 2017: JMIR Medical Informatics
https://www.readbyqxmd.com/read/29221908/how-to-maintain-active-zone-integrity-during-high-frequency-transmission
#14
REVIEW
Niklas Byczkowicz, Andreas Ritzau-Jost, Igor Delvendahl, Stefan Hallermann
In the central nervous system, the frequency at which reliable synaptic transmission can be maintained varies strongly between different types of synapses. Several pre- and postsynaptic processes must interact to enable high-frequency synaptic transmission. One of the mechanistically most challenging issues arises during repetitive neurotransmitter release, when synaptic vesicles fuse in rapid sequence with the presynaptic plasma membrane within the active zone (AZ), potentially interfering with the structural integrity of the AZ itself...
December 5, 2017: Neuroscience Research
https://www.readbyqxmd.com/read/29221849/molecular-regulation-of-fatty-acid-oxidation-in-skeletal-muscle-during-aerobic-exercise
#15
REVIEW
Anne-Marie Lundsgaard, Andreas Mæchel Fritzen, Bente Kiens
This review summarizes how fatty acid (FA) oxidation is regulated in skeletal muscle during exercise. From the available evidence it seems that acetyl-CoA availability in the mitochondrial matrix adjusts FA oxidation to exercise intensity and duration. This is executed at the step of mitochondrial fatty acyl import, as the extent of acetyl group sequestration by carnitine determines the availability of carnitine for the carnitine palmitoyltransferase 1 (CPT1) reaction. The rate of glycolysis seems therefore to be central to the amount of β-oxidation-derived acetyl-CoA that is oxidized in the tricarboxylic acid (TCA) cycle...
December 5, 2017: Trends in Endocrinology and Metabolism: TEM
https://www.readbyqxmd.com/read/29221673/mother-doesn-t-always-know-best-maternal-wormlion-choice-of-oviposition-habitat-does-not-match-larval-habitat-choice
#16
Shay Adar, Roi Dor
Habitat choice is an important decision that influences animals' fitness. Insect larvae are less mobile than the adults. Consequently, the contribution of the maternal choice of habitat to the survival and development of the offspring is considered to be crucial. According to the "preference-performance hypothesis", ovipositing females are expected to choose habitats that will maximize the performance of their offspring. We tested this hypothesis in wormlions (Diptera: Vermileonidae), which are small sand-dwelling insects that dig pit-traps in sandy patches and ambush small arthropods...
December 5, 2017: Behavioural Processes
https://www.readbyqxmd.com/read/29221551/-reflections-on-prehospitalisation-deaths
#17
REVIEW
Delphine Hugenschmitt, Alexandre Allonneau, Éric Cesareo, Pierre-Yves Gueugniaud, Hugues Lefort
In the past, death was a family and community affair, but today it is institutional and entrusted to healthcare personnel. Thanks to a questionnaire on their feelings about prehospitalisation deaths, the experience and training needs for healthcare personnel at a mobile emergency and intensive care service were analysed. The majority of these professionals had been confronted with difficulties when faced with prehospitalisation deaths. There is little understanding of religious rites, even though this is an important point in dealing with the situation...
December 2017: Soins; la Revue de Référence Infirmière
https://www.readbyqxmd.com/read/29221479/in-screw-polymethylmethacrylate-augmented-sacroiliac-screw-for-the-treatment-of-fragility-fractures-of-the-pelvis-a-prospective-observational-study-with-1-year-follow-up
#18
Andreas Höch, Philipp Pieroh, Ralf Henkelmann, Christoph Josten, Jörg Böhme
BACKGROUND: The incidence of pelvic ring fractures in the elderly significantly increased. Because of persistent pain and immobilization associated with this injury, surgical treatment is recommended. To minimise comorbidities and surgical risk, percutaneous techniques are becoming more relevant. In-screw cement augmentation of sacroiliac screw fixation is a promising procedure; however, clinical follow-up data remain scarce. This study investigated the safety and possible complications of the procedure along with a 1-year follow-up...
December 8, 2017: BMC Surgery
https://www.readbyqxmd.com/read/29221398/a-multiscale-transport-model-for-non-classical-nanochannel-electroosmosis
#19
Ravi Bhadauria, N R Aluru
We present a multiscale model describing the electroosmotic flow (EOF) in nanoscale channels involving high surface charge liquid-solid interfaces. The departure of the EOF velocity profiles from classical predictions is explained by the non-classical charge distribution in the confined direction including charge inversion, reduced mobility of interfacial counter-ions, and subsequent enhancement of the local viscosity. The excess component of the local solvent viscosity is modeled by the local application of the Fuoss-Onsager theory and the Hubbard-Onsager electro-hydrodynamic equation based dielectric friction theory...
December 7, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/29221386/finite-temperature-dynamics-of-a-holstein-polaron-the-thermo-field-dynamics-approach
#20
Lipeng Chen, Yang Zhao
Combining the multiple Davydov D2 Ansatz with the method of thermo-field dynamics, we study finite temperature dynamics of a Holstein polaron on a lattice. It has been demonstrated, using the hierarchy equations of motion method as a benchmark, that our approach provides an efficient, robust description of finite temperature dynamics of the Holstein polaron in the simultaneous presence of diagonal and off-diagonal exciton-phonon coupling. The method of thermo-field dynamics handles temperature effects in the Hilbert space with key numerical advantages over other treatments of finite-temperature dynamics based on quantum master equations in the Liouville space or wave function propagation with Monte Carlo importance sampling...
December 7, 2017: Journal of Chemical Physics
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