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https://www.readbyqxmd.com/read/28738621/determining-heterocyclic-aromatic-amines-in-aqueous-samples-a-novel-dispersive-liquid-liquid-micro-extraction-method-based-on-solidification-of-floating-organic-drop-and-ultrasound-assisted-back-extraction-followed-by-uplc-ms-ms
#1
Romina Canales, María Guiñez, Cristian Bazán, Mario Reta, Soledad Cerutti
A novel dispersive liquid-liquid microextraction based on solidification of floating organic droplet combined with ultrasound assisted back extraction for the determination of four heterocyclic aromatic amines in natural water samples prior ultra high-performance liquid chromatography-tandem mass spectrometry was developed. The analytes were extracted from the water samples by a dispersive liquid-liquid microextraction procedure based on solidification of floating organic drop, which was performed by a mixture composed by a less dense than water extraction solvent, 1-undecanol, and a dispersive solvent, methanol...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738564/determination-of-iodide-and-total-iodine-in-estuarine-waters-by-cathodic-stripping-voltammetry-using-a-vibrating-silver-amalgam-microwire-electrode
#2
Estrella Espada-Bellido, Zhaoshun Bi, Pascal Salaün, Constant M G van den Berg
Iodide in natural waters is an important nutrient to aquatic organisms and its determination is of relevance to marine aquaculture. For this reason it is of interest to have a simple analytical method for determination of iodide in water samples. Iodide in seawater can be determined electrochemically by cathodic stripping voltammetry (CSV) with a mercury drop electrode which has environmental drawbacks. In an attempt to minimise the use of mercury in voltammetry, a vibrating silver amalgam microwire electrode is used here for the determination by CSV of iodide speciation in natural waters including seawater...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738538/diosmin-improved-cognitive-deficit-and-amplified-brain-electrical-activity-in-the-rat-model-of-traumatic-brain-injury
#3
Mohammad Ali Mirshekar, Hamed Fanaei, Fereshteh Keikhaei, Fatemeh Sargolzaee Javan
OBJECTIVE: Traumatic brain injury (TBI) is one of the main causes of intellectual and cognitive disabilities in humans. Clinically, it is essential to limit the progress of cognitive impairment after TBI. It is reported that diosmin has a neuroprotective effect that can limit the progress of the impairment. The aim of this study was to evaluate the effects of diosmin on neurological score, memory, tumor necrosis factor-α (TNF-α) level and long-term potentiation in hippocampal dentate gyrus after the injury...
July 20, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28738340/novel-positional-devices-for-the-treatment-of-positional-obstructive-sleep-apnea-and-how-this-relates-to-sleep-surgery
#4
Madeline J L Revesloot, Linda Benoist, Peter van Maanen, Nico de Vries
If untreated, obstructive sleep apnea (OSA) develops as a gradual progressive disease. In the early stage of the disease most patients with OSA are positional. The archetypical patient might progress from simple positional snoring via positional early-stage mild disease to less positional moderate and finally nonpositional severe OSA. At first, the apnea-hypopnea index (AHI) is high only in the supine position, and later is high in all sleeping positions. The phenomenon is reversible. After partial effective treatment, patients with severe OSA can reverse to less severe positional OSA or, in other words, the AHI drops more in the lateral position than in supine position...
2017: Advances in Oto-rhino-laryngology
https://www.readbyqxmd.com/read/28738309/irradiation-by-blue-light-in-the-presence-of-a-photoacid-confers-changes-to-colony-morphology-of-the-plant-pathogen-colletotrichum-gloeosporioides
#5
Ron Simkovitch, Oren Gajst, Einat Zelinger, Oded Yarden, Dan Huppert
We used the photoacid 8-hydroxy-1,3,6-pyrenetrisulfonate (HPTS) that converts blue photons to acidic protons in water, with an efficiency of close to 100%, and determined that this treatment conferred changes to colony morphology of the plant pathogen Colletotrichum gloeosporioides. The time elapsed until hyphal collapse is noticed depends on both the laser intensity in mW/cm(2), and the concentration of HPTS in the Agar hydrogel. The time elapsed until hyphal collapse is noticed varies by only ±8% at HPTS concentrations of 500μM and at lower concentrations of HPTS the variance increases as the inverse of the concentration...
June 28, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28738174/distribution-of-ion-contents-and-microorganisms-during-the-electro-bioremediation-of-petroleum-contaminated-saline-soil
#6
Meng Zhang, Shuhai Guo, Fengmei Li, Bo Wu
This study investigated the distribution of ion contents and microorganisms during the electro-bioremediation (EK-Bio) of petroleum-contaminated saline soil. The results showed that soil ions tend to accumulate around the electrodes, and the concentration was correlated with the distance from the electrodes. The average soil ion content was 7.92 g/kg around the electrodes (site A) and 0.55 g/kg at the furthest distance from the electrodes (site B) after 112 days of treatment, while the initial average content was 3...
July 24, 2017: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
https://www.readbyqxmd.com/read/28738169/behavior-of-sulfur-mustard-in-sand-concrete-and-asphalt-matrices-evaporation-degradation-and-decontamination
#7
Hyunsook Jung, Seungki Choi
The evaporation, degradation, and decontamination of sulfur mustard on environmental matrices including sand, concrete, and asphalt are described. A specially designed wind tunnel and thermal desorber in combination with gas chromatograph (GC) produced profiles of vapor concentration obtained from samples of the chemical agent deposited as a drop on the surfaces of the matrices. The matrices were exposed to the chemical agent at room temperature, and the degradation reactions were monitored and characterized...
July 24, 2017: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
https://www.readbyqxmd.com/read/28738168/role-of-age-and-injury-mechanism-in-cervical-spine-injury-tolerance-under-head-contact-loading
#8
Narayan Yoganandan, Sajal Chirvi, Liming Voo, Frank A Pintar, Anjishnu Banerjee
OBJECTIVE: To determine the influence of age on cervical spine tolerance to injury from head contact loading using survival analysis. METHODS: This study analyzed data from previously conducted experiments using Post Mortem Human Subject specimens (PMHS). Group A tests used the upright intact head-cervical column experimental model. The inferior end of the specimen was fixed, head was balanced by a mechanical system, and natural lordosis was removed. Specimens were placed on a testing device via a load cell...
July 24, 2017: Traffic Injury Prevention
https://www.readbyqxmd.com/read/28738139/association-of-history-of-dizziness-and-long-term-adverse-outcomes-with-early-vs-later-orthostatic-hypotension-assessment-times-in-middle-aged-adults
#9
Stephen P Juraschek, Natalie Daya, Andreea M Rawlings, Lawrence J Appel, Edgar R Miller, B Gwen Windham, Michael E Griswold, Gerardo Heiss, Elizabeth Selvin
Importance: Guidelines recommend assessing orthostatic hypotension (OH) 3 minutes after rising from supine to standing positions. It is not known whether measurements performed immediately after standing predict adverse events as strongly as measurements performed closer to 3 minutes. Objective: To compare early vs later OH measurements and their association with history of dizziness and longitudinal adverse outcomes. Design, Setting, and Participants: This was a prospective cohort study of middle-aged (range, 44-66 years) participants in the Atherosclerosis Risk in Communities Study (1987-1989)...
July 24, 2017: JAMA Internal Medicine
https://www.readbyqxmd.com/read/28738125/legalization-of-same-sex-marriage-and-drop-in-adolescent-suicide-rates-association-but-not-causation
#10
Joseph Kamtchum-Tatuene, Jean Jacques Noubiap, Yannick F Fogang
No abstract text is available yet for this article.
July 24, 2017: JAMA Pediatrics
https://www.readbyqxmd.com/read/28738123/legalization-of-same-sex-marriage-and-drop-in-adolescent-suicide-rates-association-but-not-causation-reply
#11
Julia Raifman, Ellen Moscoe, S Bryn Austin
No abstract text is available yet for this article.
July 24, 2017: JAMA Pediatrics
https://www.readbyqxmd.com/read/28737970/the-photocatalytic-degradation-of-methylene-blue-by-green-semiconductor-films-that-is-induced-by-irradiation-by-a-light-emitting-diode-and-visible-light
#12
Chih-Chi Yang, Ruey-An Doong, Ku-Fan Chen, Giin-Shan Chen, Yung-Pin Tsai
This study develops a low-energy rotating photocatalytic contactor (LE-RPC) that has Cu-doped TiO2 films coated on stainless steel rotating disks, to experimentally evaluate the efficiency of the degradation and decolourization of methylene blue (MB) under irradiation from different light sources (visible 430 nm, LED 460 nm and LED 525 nm). The production of hydroxyl radicals is also examined. The experimental results show that the photocatalytic activity of TiO2 that is doped with Cu(2+)is induced by illumination with visible light and a LED...
July 24, 2017: Journal of the Air & Waste Management Association
https://www.readbyqxmd.com/read/28737758/real-world-experience-with-0-2%C3%A2-%C3%AE-g-day-fluocinolone-acetonide-intravitreal-implant-iluvien-in-the-united-kingdom
#13
C Bailey, U Chakravarthy, A Lotery, G Menon, J Talks
AimsTo compare safety outcomes and visual function data acquired in the real-world setting with FAME study results in eyes treated with 0.2 μg/day fluocinolone acetonide (FAc).MethodsFourteen UK clinical sites contributed to pseudoanonymised data collected using the same electronic medical record system. Data pertaining to eyes treated with FAc implant for diabetic macular oedema (DMO) was extracted. Intraocular pressure (IOP)-related adverse events were defined as use of IOP-lowering medication, any rise in IOP>30 mm Hg, or glaucoma surgery...
July 24, 2017: Eye
https://www.readbyqxmd.com/read/28737034/modification-of-the-poly-bisdodecylquaterthiophene-pqt12-structure-for-high-and-predominantly-nonionic-conductivity-with-matched-dopants
#14
Hui Li, Mallory E DeCoster, Robert M Ireland, Jian Song, Patrick E Hopkins, Howard E Katz
A series of p-type polymers was synthesized by modifying the structure of poly(bisdodecylquaterthiophene) (PQT12) to increase their oxidizability by p-dopants. A sulfur atom is inserted between the thiophene rings and dodecyl chains, and/or 3,4-ethylenedioxy groups are appended to thiophene rings of PQT12. All the polymers have good solubility in organic solvents and can be formed as active layers in conductive and thermoelectric devices by simply drop casting. Doped with the strong oxidant nitrosonium tetrafluroborate (NOBF4), PQTS12 (with sulfur in side chains) shows a very high conductivity up to 350 S cm-1, the highest reported nonionic conductivity among films made from dopant-polymer solutions...
July 24, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28736895/independent-association-between-age-and-circadian-systolic-blood-pressure-patterns-in-adults-with-hypertension
#15
Ming Deng, Da-Wei Chen, Yi-Fei Dong, Peng Lu, Bi-Ming Zhan, Jian-Qing Xu, Xi-Xin Ji, Ping Li, Xiao-Shu Cheng
Previous studies indicate a preliminary association between age and circadian blood pressure (BP) variation. This association would be affected by confounding factors in real-world populations. The authors investigated whether this is a convincingly independent association in a real-world population of adults with hypertension. Clinical data and findings of 24-hour ambulatory BP monitoring were obtained from 297 consecutive adults with hypertension (60.19±0.77 years). BP dipping patterns were categorized based on the percentage of nocturnal BP drop...
July 23, 2017: Journal of Clinical Hypertension
https://www.readbyqxmd.com/read/28736672/handheld-optical-coherence-tomography-angiography
#16
Jianlong Yang, Liang Liu, J Peter Campbell, David Huang, Gangjun Liu
We developed a handheld optical coherence tomography angiography (OCTA) system using a 100-kHz swept-source laser. The handheld probe weighs 0.4 kg and measures 20.6 × 12.8 × 4.6 cm(3). The system has dedicated features for handheld operation. The probe is equipped with a mini iris camera for easy alignment. Real-time display of the en face OCT and cross-sectional OCT images in the system allows accurately locating the imaging target. Fast automatic focusing was achieved by an electrically tunable lens controlled by a golden-section search algorithm...
April 1, 2017: Biomedical Optics Express
https://www.readbyqxmd.com/read/28736321/an-intraprostatic-modified-release-formulation-of-antiandrogen-2-hydroxyflutamide-for-localized-prostate-cancer
#17
T L Tammela, M Häggman, S Ladjevardi, K Taari, T Isotalo, H Lennernäs, J Weis, C von Below, C Wassberg, B Lennernäs, A Tolf, N Axén, C-G Gölander, H Ahlström
PURPOSE: To investigate tolerability, safety and antitumor effects of a novel intra-prostatic depot formulation of antiandrogen 2-hydroxyflutamide (2-HOF in NanoZolid(®)) in men with localized prostate cancer (PCa). MATERIALS AND METHODS: Two clinical trials, LPC-002 and LPC-003, were conducted on a total of 47 men. The formulation was injected transrectally into the prostate with ultrasound guidance. In LPC-002 the effects on prostate specific antigen (PSA) and prostate volume (PV) were measured over 6 months on 24 patients...
July 20, 2017: Journal of Urology
https://www.readbyqxmd.com/read/28736188/asparaginase-associated-pancreatitis-in-childhood-acute-lymphoblastic-leukaemia-an-observational-ponte-di-legno-toxicity-working-group-study
#18
Benjamin O Wolthers, Thomas L Frandsen, André Baruchel, Andishe Attarbaschi, Shlomit Barzilai, Antonella Colombini, Gabriele Escherich, Kathrine Grell, Hiroto Inaba, Gábor Kovacs, Der-Cherng Liang, Marion Mateos, Veerle Mondelaers, Anja Möricke, Tomasz Ociepa, Sujith Samarasinghe, Lewis B Silverman, Inge M van der Sluis, Martin Stanulla, Lynda M Vrooman, Michihiro Yano, Ester Zapotocka, Kjeld Schmiegelow
BACKGROUND: Survival for childhood acute lymphoblastic leukaemia surpasses 90% with contemporary therapy; however, patients remain burdened by the severe toxic effects of treatment, including asparaginase-associated pancreatitis. To investigate the risk of complications and risk of re-exposing patients with asparaginase-associated pancreatitis to asparaginase, 18 acute lymphoblastic leukaemia trial groups merged data for this observational study. METHODS: Patient files from 26 trials run by 18 trial groups were reviewed on children (aged 1·0-17·9 years) diagnosed with t(9;22)-negative acute lymphoblastic leukaemia between June 1, 1996, and Jan 1, 2016, who within 50 days of asparaginase exposure developed asparaginase-associated pancreatitis...
July 20, 2017: Lancet Oncology
https://www.readbyqxmd.com/read/28736164/idiothetic-path-integration-in-the-fruit-fly-drosophila-melanogaster
#19
Irene S Kim, Michael H Dickinson
After discovering a small drop of food, hungry flies exhibit a peculiar behavior in which they repeatedly stray from, but then return to, the newly discovered resource. To study this behavior in more detail, we tracked hungry Drosophila as they explored a large arena, focusing on the question of how flies remain near the food. To determine whether flies use external stimuli, we individually eliminated visual, olfactory, and pheromonal cues. In all cases, flies still exhibited a centralized search behavior, suggesting that none of these cues are absolutely required for navigation back to the food...
July 11, 2017: Current Biology: CB
https://www.readbyqxmd.com/read/28735884/from-drop-shape-analysis-to-stress-fitting-elastometry
#20
REVIEW
Mathias Nagel, Theo A Tervoort, Jan Vermant
Drop-shape analysis using pendant or sessile drops is a well-established experimental technique for measuring the interfacial or surface tension, and changes thereof. The method relies on deforming a drop by either gravity or buoyancy and fitting the Young-Laplace equation to the drop shape. Alternatively one can prescribe the shape and measure the pressure inside the drop or bubble using pressure tensiometry. However, when an interface with a complex microstructure is present, extra and anisotropic interfacial stresses may develop due to lateral interactions between the surface-active moieties, leading to deviations of the drop shape or even a wrinkling of the interface...
July 13, 2017: Advances in Colloid and Interface Science
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