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https://www.readbyqxmd.com/read/28231529/new-enantioselective-lc-method-development-and-validation-for-the-assay-of-modafinil
#1
Marianna Harvanová, Taťána Gondová
For the first time, a new, fast and sensitive chromatographic method for the separation and determination of modafinil enantiomers was developed on chiral stationary phase with macrocyclic glycopeptide teicoplanin in the polar organic mode. The effect of the mobile phase composition and column temperature on the retention and enantioseparation were studied. The separation was performed using a Chirobiotic T column (250×4.6mm, 5μm) with methanol and triethylamine (100/0.05, v/v) as the mobile phase at a flow rate of 1...
February 16, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28231443/changes-in-fish-communities-on-a-small-spatial-scale-an-effect-of-increased-habitat-complexity-by-an-offshore-wind-farm
#2
R van Hal, A B Griffioen, O A van Keeken
The number of offshore wind farms (OWF) is increasing to meet the demands for renewable energy. The piles and hard substrate surrounding these piles creates new habitat for species with preference to hard substrates. We studied the impact of this hard substrate on the fish community in a Dutch OWF in the sandy southern North Sea, which had been in operation for five years. Multi-mesh gillnets were placed near the OWF structures on the hard substrate protection revetments and on the sandy bottom in the middle of the farm...
January 31, 2017: Marine Environmental Research
https://www.readbyqxmd.com/read/28231236/errata-vol-66-no-ss-5
#3
(no author information available yet)
In the Surveillance Summary "Health-Related Behaviors by Urban-Rural County Classification - United States, 2013," errors occurred in Table 1 and Table 2. On page 5, in Table 1, under the Micropolitan column, the 95% CI values should have been (75.7-77.3) for the current nonsmoking row and (29.8-31.4) for the maintaining normal body weight row; under the Noncore column, the 95% CI values should have been (74.0-75.9) for the current nonsmoking row, (28.0-29.8) for the maintaining body weight row, and (45.7-47...
February 24, 2017: MMWR. Morbidity and Mortality Weekly Report
https://www.readbyqxmd.com/read/28230966/increasing-peak-capacity-in-non-targeted-omics-applications-by-combining-full-scan-field-asymmetric-waveform-ion-mobility-spectrometry-with-liquid-chromatography-mass-spectrometry
#4
Kayleigh L Arthur, Matthew A Turner, James C Reynolds, Colin S Creaser
Full scan field asymmetric waveform ion mobility spectrometry (FAIMS) combined with liquid chromatography and mass spectrometry (LC-FAIMS-MS) is shown to enhance peak capacity for omics applications. A miniaturized FAIMS device capable of rapid compensation field scanning has been incorporated into an ultra-high performance liquid chromatography (UHPLC) and time-of-flight (TOF) mass spectrometry analysis, allowing the acquisition of full scan FAIMS and MS nested data sets within the timescale of a UHPLC peak...
February 23, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28230757/simultaneous-quantification-of-nine-new-furanocoumarins-in-angelicae-dahuricae-radix-using-ultra-fast-liquid-chromatography-with-tandem-mass-spectrometry
#5
Lei Zhang, Wei Wei, Xiu-Wei Yang
A series of new furanocoumarins with long-chain hydrophobic groups, namely andafocoumarins A-H and J, have been isolated from the dried roots of Angelica dahurica cv. Hangbaizhi (Angelicae Dahuricae radix) in our previous study, among which andafocoumarins A and B were demonstrated to have better anti-inflammatory activity than the positive controls. In this work, a sensitive, accurate, and efficient ultra-fast liquid chromatography coupled with triple quadrupole mass spectrometer (UFLC-MS/MS) method was developed and validated for simultaneous quantification of above-mentioned nine compounds in four cultivars of Angelicae Dahuricae Radix...
February 20, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28230696/the-call-to-service-is-personal-from-vietnam-to-red-cross-volunteer
#6
Robert J Hassmiller
Updated several times a week with posts by a wide variety of authors, AJN's blog Off the Charts allows us to provide more timely-and often more personal-perspectives on professional, policy, and clinical issues. Best of the Blog will be a regular column to bring AJN readers recent posts that we think deserve a wider audience. To read more, please visit: www.ajnoffthecharts.com.
March 2017: American Journal of Nursing
https://www.readbyqxmd.com/read/28230573/global-sagittal-imbalance-due-to-change-in-pelvic-incidence-after-traumatic-spinopelvic-dissociation
#7
Han-Dong Lee, Chang-Hoon Jeon, Nam-Su Chung, Suk-Hyeong Won
OBJECTIVES: Traumatic spinopelvic dissociation separates the spinal column from the pelvis, which usually creates lumbosacral kyphosis. We aimed to examine how the spinopelvic profiles changes after traumatic spinopelvic dissociation, and which are the relevant factors for the sagittal imbalance of the spine. DESIGN: Retrospective analysis. SETTING: Level I trauma center PATIENTS:: Thirty-nine consecutive patients who were diagnosed with traumatic spinopelvic dissociation and had a minimum 2-year radiological follow-up were included...
February 20, 2017: Journal of Orthopaedic Trauma
https://www.readbyqxmd.com/read/28230323/simultaneous-determination-of-seven-nitrogen-containing-phenyl-ethers-in-cosmetics-by-gas-chromatography-with-mass-spectrometry-and-dispersive-solid-phase-extraction
#8
Jiale Huang, Langjun Zhou, Zhiqing Xun, Qiang Wang, Senyu Lin, Xindong Guo, Yongtong Cai
An analytical method was established for the simultaneous determination of seven nitrogen-containing phenyl ethers (2-anisidine, 3-anisidine, 4-anisidine, 2-nitroanisole, 3-nitroanisole, 4-nitroanisole and 3,3'-dimethoxybenzidine) in cosmetics by gas chromatography with mass spectrometry in this work. The samples were extracted with ethyl acetate and purified with primary secondary amine during the dispersed solid phase extraction. The analytes were separated by a DB-17MS column and detected in the electron ionization mode of mass spectrometry in the selected ions monitoring mode...
February 23, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28230319/depletion-of-abundant-human-serum-proteins-by-per-se-imprinted-cryogels-based-on-sample-heterogeneity
#9
Chun Yang, Ya-Ru Liu, Yan Zhang, Jian Wang, Li-Li Tian, Ya-Nan Yan, Wei-Qin Cao, Yu-Yang Wang
Macroporous cryogels were prepared and used to deplete abundant proteins. It was accomplished based on the sample heterogeneity rather than any exogenous assistance. Human serum was added in monomer solutions to synthesize molecularly imprinted polymers (MIPs); therein some abundant proteins were imprinted in the polyacrylamide cryogels. Meanwhile the rare components remained aqueous. Chromatography and electrophoresis showed that albumin, serotransferrin and most globulins were depleted by columns packed with the MIPs...
February 23, 2017: Proteomics
https://www.readbyqxmd.com/read/28229392/determination-of-rabeprazole-enantiomers-in-commercial-tablets-using-immobilized-cellulose-based-stationary-phase
#10
Miri Kim, Su Kyung Yu, Quoc-Ky Truong, Xuan-Lan Mai, Hyun Kyu Chung, Jong-Seong Kang, Kyeong Ho Kim
Rabeprazole is one of the latest proton-pump inhibitors used for treatment of several gastrointestinal disorders. For therapeutic applications, rabeprazole has been administered as a mixture of R-(+) and S-(-) enantiomers. Owing to pharmacological and toxicological differences between stereoisomers, chiral recognition has now become an integral part of drug research and development. A simple and rapid liquid chromatographic method for enantioselective separation and determination of R-(+) and S-(-) enantiomers of rabeprazole in bulk drug and pharmaceutical formulations was developed...
February 22, 2017: Archives of Pharmacal Research
https://www.readbyqxmd.com/read/28229382/enhanced-degradation-of-spiro-insecticides-and-their-leacher-enol-derivatives-in-soil-by-solarization-and-biosolarization-techniques
#11
José Fenoll, Isabel Garrido, Nuria Vela, Caridad Ros, Simón Navarro
The leaching potential of three insecticides (spirodiclofen, spiromesifen, and spirotetramat) was assessed using disturbed soil columns. Small quantities of spirodiclofen and spiromesifen were detected in leachate fraction, while spirotetramat residues were not found in the leachates. In addition, the transformation products (enol derivatives) are relatively more mobile than the parent compounds and may leach into groundwater. Moreover, the use of disinfection soil techniques (solarization and biosolarization) to enhance their degradation rates in soil was investigated...
February 22, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28228174/fast-atomic-scale-elemental-mapping-of-crystalline-materials-by-stem-energy-dispersive-x-ray-spectroscopy-achieved-with-thin-specimens
#12
Ping Lu, Renliang Yuan, Jian Min Zuo
Elemental mapping at the atomic-scale by scanning transmission electron microscopy (STEM) using energy-dispersive X-ray spectroscopy (EDS) provides a powerful real-space approach to chemical characterization of crystal structures. However, applications of this powerful technique have been limited by inefficient X-ray emission and collection, which require long acquisition times. Recently, using a lattice-vector translation method, we have shown that rapid atomic-scale elemental mapping using STEM-EDS can be achieved...
February 2017: Microscopy and Microanalysis
https://www.readbyqxmd.com/read/28227096/prediction-of-forelimb-muscle-emgs-from-the-corticospinal-signals-in-rats
#13
Sinan Gok, Mesut Sahin, Sinan Gok, Mesut Sahin, Sinan Gok, Mesut Sahin
To generate voluntary forearm movements, the information that is encoded in the activity of the cortical neurons has to travel through the spinal cord and activate the skeletal muscles. The axons carrying these signals are tightly bundled together in the descending tracts that control the spinal circuitry innervating the forearm muscles. In this paper, we show that corticospinal tract (CST) signals can be used to predict forearm electromyographic (EMG) activities that are recorded during an isometric-pull task...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226797/thin-film-high-density-micro-electrocorticographic-decoding-of-a-human-cortical-gyrus
#14
Leah Muller, Sarah Felix, Kedar G Shah, Kye Lee, Satinderpall Pannu, Edward F Chang, Leah Muller, Sarah Felix, Kedar G Shah, Kye Lee, Satinderpall Pannu, Edward F Chang, Satinderpall Pannu, Sarah Felix, Leah Muller, Kedar G Shah, Kye Lee, Edward F Chang
High-density electrocorticography (ECoG) arrays are promising interfaces for high-resolution neural recording from the cortical surface. Commercial options for high-density arrays are limited, and historically tradeoffs must be made between spatial coverage and electrode density. However, thin-film technology is a promising alternative for generating electrode arrays capable of large area coverage and high channel count, with resolution on the order of cortical columns in the functional surface unit of a human gyrus...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226768/thalamic-gamma-band-desynchronization-in-a-computational-model-of-the-auditory-pathway
#15
Ana E Uriarte, Lars Haab, Narsis Salafzoon, Daniel J Strauss, Ana E Uriarte, Lars Haab, Narsis Salafzoon, Daniel J Strauss, Ana E Uriarte, Lars Haab, Narsis Salafzoon, Daniel J Strauss
Recent studies have focused on modeling the response of the early auditory processing stages to sound stimuli. However, the influence of sound on the higher stages like the auditory thalamus are not well identified. To understand how different sound stimuli affect the response of neurons in these higher stages, it is necessary to model the auditory pathway from the auditory nerve (AN) through the different stages up to the cortex. In this article we present a model of one of the paths through which sound travels from the AN to the cortex...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226415/topographical-pressure-pain-sensitivity-maps-of-the-temporalis-muscle-in-people-with-frequent-episodic-and-chronic-tension-type-headache
#16
María Palacios Ceña, Matteo Castaldo, Kelun Wang, Pascal Madeleine, Ángel L Guerrero, Lars Arendt-Nielsen, César Fernández de Las Peñas
BACKGROUND: Previous pilot studies suggest the presence of heterogeneous sensitivity to pressure in primary headaches without considering the frequency of headache episodes. OBJECTIVE: To investigate the differences in topographical pressure pain sensitivity maps in the temporalis muscle between individuals with frequent episodic (FETTH) and chronic (CTTH) tension-type headache by controlling the presence of anxiety and depression. METHODS: Pressure pain thresholds (PPTs) were assessed bilaterally from 9 points distributed over the temporalis muscle (3 points in the anterior portion, 3 in the middle portion, and the remaining 3 in the posterior portion of the muscle belly) in 113 patients with FETTH and 91 with CTTH in a blinded design...
February 22, 2017: Pain Practice: the Official Journal of World Institute of Pain
https://www.readbyqxmd.com/read/28226311/effects-of-root-extracts-of-eurycoma-longifolia-jack-on-corpus-cavernosum-of-rat
#17
Bae Huey Tee, See Ziau Hoe, Swee Hung Cheah, Sau Kuen Lam
OBJECTIVE: This study was conducted to investigate the mechanisms of action of Eurycoma longifolia in rat corpus cavernosum. MATERIALS AND METHODS: Tincture of the roots was concentrated to dryness by evaporating the ethanol in vacuo. This ethanolic extract was partitioned into five fractions sequentially with hexane, dichloromethane, ethyl acetate, butanol and water. The corpus cavernosum relaxant activity of each fraction was investigated. Dichloromethanic (DCM) fraction which showed the highest potency in relaxing phenylephrine-precontracted corpora cavernosa was purified by column chromatography...
February 22, 2017: Medical Principles and Practice: International Journal of the Kuwait University, Health Science Centre
https://www.readbyqxmd.com/read/28225365/magnitude-location-and-factors-related-to-regional-and-global-sagittal-alignment-change-in-long-adult-deformity-constructs-report-of-183-patients-with-2-year-follow-up
#18
Alexander A Theologis, Michael Safaee, Justin K Scheer, Virginie Lafage, Rick Hostin, Robert A Hart, Eric O Klineberg, Themistocles S Protopsaltis, Vedat Deviren, Douglas C Burton, Daniel M Sciubba, Khaled Kebaish, Shay Bess, Christopher I Shaffrey, Frank Schwab, Justin S Smith, Christopher P Ames
STUDY DESIGN: This is a retrospective review of a prospective multicenter adult spinal deformity (ASD) database. OBJECTIVE: To quantify the location and magnitude of sagittal alignment changes within instrumented and noninstrumented spinal segments and to investigate the factors associated with these changes after surgery for ASD. SUMMARY OF BACKGROUND DATA: Spinal realignment is one of the major goals in ASD surgery and changes in the alignment are common following surgical correction...
February 20, 2017: Clinical Spine Surgery
https://www.readbyqxmd.com/read/28225304/column-switching-uhplc-ms-ms-with-restricted-access-material-for-the-determination-of-cns-drugs-in-plasma-samples
#19
Vinicius Ricardo Acquaro, Diego Soares Domingues, Maria Eugênia Costa Queiroz
BACKGROUND: Polypharmacy is a common practice in schizophrenia. Consequently, therapeutic drug monitoring is usually adopted to maintain the concentrations of the drugs in the plasma within a targeted therapeutic range, to maximize therapeutic efficiency and to diminish adverse side effects. METHODOLOGY: This study reports on a column switching UHPLC-MS/MS method to determine psychotropic drugs in plasma samples simultaneously. RESULTS: The method was linear from 0...
February 22, 2017: Bioanalysis
https://www.readbyqxmd.com/read/28225215/enantioseparation-characteristics-of-the-chiral-stationary-phases-based-on-natural-and-regenerated-chitins
#20
Xiao-Meng Mei, Wei Chen, Zheng-Wu Bai
Natural and regenerated chitins were derivatized with 3,5-dimethyphenyl isocyanate. The corresponding chiral stationary phases were prepared by coating the resulting chitin derivatives on 3-aminopropyl silica gel. The swelling capacity of the chitin derivatives, enantioseparation capability as well as eluents tolerance of the chiral stationary phases were evaluated. The results demonstrated there was no remarkable difference in enantioseparation capability between natural and regenerated chitins based chiral stationary phases...
February 22, 2017: Journal of Separation Science
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