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https://www.readbyqxmd.com/read/28734271/development-and-validation-of-sensitive-lc-ms-ms-method-for-the-quantification-of-suvn-502-and-its-metabolite-and-its-application-for-first-in-human-pharmacokinetic-study
#1
Ramakrishna Nirogi, Devender Reddy Ajjala, Raghupathi Aleti, Lakshmiprasanna Rayapati, Hanumanth Rao Pantangi, Rajesh Kumar Boggavarapu, Naga Surya Prakash Padala
A sensitive and rapid LC-MS/MS method was developed and validated for the quantification of SUVN-502 and M1 of SUVN-502, a 5-HT6 receptor antagonist for the treatment of dementia associated with Alzheimer's disease. Following solid-phase extraction, SUVN-502 and M1 of SUVN-502 and IS were eluted with 10mM ammonium acetate (pH 4.0) and acetonitrile using a rapid gradient program on reverse phase column. Multiple reaction monitoring mode was used to monitor the respective transitions of m/z 478.2→377.7 for SUVN-502 and m/z 464...
April 14, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28734266/air-quality-and-health-effects-of-biogenic-volatile-organic-compounds-emissions-from-urban-green-spaces-and-the-mitigation-strategies
#2
Yuan Ren, Zelong Qu, Yuanyuan Du, Ronghua Xu, Danping Ma, Guofu Yang, Yan Shi, Xing Fan, Akira Tani, Peipei Guo, Ying Ge, Jie Chang
Biogenic volatile organic compounds (BVOCs) emissions lead to fine particulate matter (PM2.5) and ground-level ozone pollution, and are harmful to human health, especially in urban areas. However, most BVOCs estimations ignored the emissions from urban green spaces, causing inaccuracies in the understanding of regional BVOCs emissions and their environmental and health effects. In this study, we used the latest local vegetation datasets from our field survey and applied an estimation model to analyze the spatial-temporal patterns, air quality impacts, health damage and mitigating strategies of BVOCs emissions in the Greater Beijing Area...
July 19, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28734265/decreased-lung-function-with-mediation-of-blood-parameters-linked-to-e-waste-lead-and-cadmium-exposure-in-preschool-children
#3
Xiang Zeng, Xijin Xu, H Marike Boezen, Judith M Vonk, Weidong Wu, Xia Huo
Blood lead (Pb) and cadmium (Cd) levels have been associated with lower lung function in adults and smokers, but whether this also holds for children from electronic waste (e-waste) recycling areas is still unknown. To investigate the contribution of blood heavy metals and lung function levels, and the relationship among living area, the blood parameter levels, and the lung function levels, a total of 206 preschool children from Guiyu (exposed area), and Haojiang and Xiashan (reference areas) were recruited and required to undergo blood tests and lung function tests during the study period...
July 19, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28734264/a-small-scale-portable-method-for-extracting-microplastics-from-marine-sediments
#4
Rachel L Coppock, Matthew Cole, Penelope K Lindeque, Ana M Queirós, Tamara S Galloway
Microplastics (plastic particles, 0.1 μm-5 mm in size) are widespread marine pollutants, accumulating in benthic sediments and shorelines the world over. To gain a clearer understanding of microplastic availability to marine life, and the risks they pose to the health of benthic communities, ecological processes and food security, it is important to obtain accurate measures of microplastic abundance in marine sediments. To date, methods for extracting microplastics from marine sediments have been disadvantaged by complexity, expense, low extraction efficiencies and incompatibility with very fine sediments...
July 19, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28734261/abundant-plankton-sized-microplastic-particles-in-shelf-waters-of-the-northern-gulf-of-mexico
#5
Rosana Di Mauro, Matthew J Kupchik, Mark C Benfield
Accumulation of marine debris is a global problem that affects the oceans on multiple scales. The majority of floating marine debris is composed of microplastics: plastic particles up to 5 mm in diameter. With similar sizes and appearances to natural food items, these small fragments pose potential risks to many marine organisms including zooplankton and zooplanktivores. Semi-enclosed seas are reported to have high concentrations of microplastics, however, the distribution and concentration of microplastics in one such system, the Gulf of Mexico, remains unknown...
July 19, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28734260/time-averaged-concentrations-are-effective-for-predicting-chronic-toxicity-of-varying-copper-pulse-exposures-for-two-freshwater-green-algae-species
#6
Brad M Angel, Stuart L Simpson, Ellissah Granger, Kathryn Goodwyn, Dianne F Jolley
Intermittent, fluctuating and pulsed contaminant discharges may result in organisms receiving highly variable contaminant exposures. This study investigated the effects of dissolved copper pulse concentration and exposure duration on the toxicity to two freshwater green algae species. The effects of single copper pulses of between 1 and 48 h duration and continuous exposures (72 h) on growth rate inhibition of Pseudokirchneriella subcapitata and Chlorella sp. were compared on a time-averaged concentration (TAC) basis...
July 19, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28734257/comparison-of-femoropopliteal-artery-stents-under-axial-and-radial-compression-axial-tension-bending-and-torsion-deformations
#7
Kaspars Maleckis, Paul Deegan, William Poulson, Cole Sievers, Anastasia Desyatova, Jason MacTaggart, Alexey Kamenskiy
High failure rates of Peripheral Arterial Disease (PAD) stenting appear to be associated with the inability of certain stent designs to accommodate severe biomechanical environment of the femoropopliteal artery (FPA) that bends, twists, and axially compresses during limb flexion. Twelve Nitinol stents (Absolute Pro, Supera, Lifestent, Innova, Zilver, Smart Control, Smart Flex, EverFlex, Viabahn, Tigris, Misago, and Complete SE) were quasi-statically tested under bench-top axial and radial compression, axial tension, bending, and torsional deformations...
July 13, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28734255/use-of-electronic-cigarettes-in-public-and-private-settings-in-barcelona-spain
#8
Nuria Matilla-Santander, Marcela Fu, Montse Ballbè, Kailey Bunch, Cristina Lidón-Moyano, Juan Carlos Martín-Sánchez, Esteve Fernández, Jose M Martínez-Sánchez
OBJECTIVES: To describe the prevalence of e-cigarette users who use them in selected indoor public and workplaces, and private venues in Barcelona (Spain) in 2015. METHODS: This is a cross-sectional study of a sample of e-cigarette users (≥ 18 years) from Barcelona (n = 600). We calculated the proportion of e-cigarette users who used the device in public and private settings (in the last 30 days). We fit multivariate logistic regression models adjusted for sex and age to calculate the odds ratios (OR) with their 95% confidence intervals (CI) of e-cigarette use by socio-demographic factors, dual use and nicotine-containing e-cigarettes...
July 19, 2017: Environmental Research
https://www.readbyqxmd.com/read/28734254/childhood-polybrominated-diphenyl-ether-pbde-exposure-and-neurobehavior-in-children-at-8-years
#9
Ann M Vuong, Kimberly Yolton, Changchun Xie, Glenys M Webster, Andreas Sjödin, Joseph M Braun, Kim N Dietrich, Bruce P Lanphear, Aimin Chen
BACKGROUND: Prenatal polybrominated diphenyl ether (PBDE) exposure has been associated with decrements in IQ and increased attention deficit/hyperactivity disorder related behaviors in children; however, data are limited for the role of postnatal exposures. OBJECTIVES: We investigated the association between a series of childhood PBDE concentrations and Full-Scale Intelligence Quotient (FSIQ) and externalizing problems at 8 years. METHODS: We used data from 208 children in the Health Outcomes and Measures of the Environment (HOME) Study, a prospective pregnancy and birth cohort...
July 19, 2017: Environmental Research
https://www.readbyqxmd.com/read/28734251/climatic-controls-of-ecohydrological-responses-in-the-highlands-of-northern-ethiopia
#10
Samuale Tesfaye, Emiru Birhane, Toon Leijnse, S E A T M van der Zee
Climate variability and recurrent droughts have a strong negative impact on agricultural production and hydrology in the highlands northern Ethiopia. Since the 1980s, numerous mitigation and land rehabilitation measures have been implemented by local and national authorities to reduce these impacts, are often poorly effective. As underlying reason may be that controlling relationships between climate and ecohydrology at medium-sized catchments (10-10,000km(2)) of semi-arid highlands are not well known. We investigated trends and relationships in precipitation, temperature, streamflow, and net primary productivity (NPP)...
July 19, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28734249/nitrogen-losses-and-greenhouse-gas-emissions-under-different-n-and-water-management-in-a-subtropical-double-season-rice-cropping-system
#11
Kaiming Liang, Xuhua Zhong, Nongrong Huang, Rubenito M Lampayan, Yanzhuo Liu, Junfeng Pan, Bilin Peng, Xiangyu Hu, Youqiang Fu
Nitrogen non-point pollution and greenhouse gas (GHG) emission are major challenges in rice production. This study examined options for both economic and environmental sustainability through optimizing water and N management. Field experiments were conducted to examine the crop yields, N use efficiency (NUE), greenhouse gas emissions, N losses under different N and water management. There were four treatments: zero N input with farmer's water management (N0), farmer's N and water management (FP), optimized N management with farmer's water management (OPTN) and optimized N management with alternate wetting and drying irrigation (OPTN+AWD)...
July 19, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28734246/topological-pattern-for-the-search-of-new-active-drugs-against-methicillin-resistant-staphylococcus-aureus
#12
Jose I Bueso-Bordils, Maria T Perez-Gracia, Beatriz Suay-Garcia, Maria J Duart, Rafael V Martin Algarra, Luis Lahuerta Zamora, Gerardo M Anton-Fos, Pedro A Aleman Lopez
Molecular topology was used to develop a mathematical model capable of classifying compounds according to antimicrobial activity against methicillin resistant Staphylococcus aureus (MRSA). Topological indices were used as structural descriptors and their relation to antimicrobial activity was determined by using linear discriminant analysis. This topological model establishes new structure activity relationships which show that the presence of cyclopropyl, chlorine and ramification pairs at a distance of two bonds favor this activity, while the presence of tertiary amines decreases it...
July 8, 2017: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/28734245/azaphenothiazines-promising-phenothiazine-derivatives-an-insight-into-nomenclature-synthesis-structure-elucidation-and-biological-properties
#13
REVIEW
Krystian Pluta, Małgorzata Jeleń, Beata Morak-Młodawska, Michał Zimecki, Jolanta Artym, Maja Kocięba, Ewa Zaczyńska
For the last two decades, classical phenothiazines have attracted attention of researchers, as the hitherto investigations have revealed many significant biological activities within this class of compounds, other than originally discovered neuroleptic ones. Important, new pharmaceutical results on phenothiazines, as 10-substituted dibenzothiazines, were recently highlighted in several reviews. Azaphenothiazines are structurally modified phenothiazines by substitution of one or both benzene rings in the phenothiazine ring system with the azine rings, such as: pyridine, pyridazine, pyrimidine, pyrazine, 1,2,4-triazine, quinoline, quinoxaline, benzoxazine and benzothiazine...
July 8, 2017: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/28734236/determinants-of-mental-and-physical-health-related-quality-of-life-among-patients-hospitalized-for-suicidal-behavior
#14
Leandro Grendas, Demián Rodante, Sasha Rojas, Soledad Puppo, Patricia Vidjen, Gisela Lado, Alicia Portela, Federico M Daray
The current study was interested in exploring the clinical factors related to mental and physical health-related quality of life among patients hospitalized for suicidal behavior. A multicenter cross-sectional study was designed to compare data obtained form 246 patients hospitalized for suicide behavior. Results suggest that mental health-related quality of life was negatively associated with hopelessness while physical health-related quality of life was negatively associated with age, medical disease and the number of previous suicide attempts and positively associated with employment...
July 14, 2017: Psychiatry Research
https://www.readbyqxmd.com/read/28734234/association-of-primary-central-nervous-system-vasculitis-with-the-presence-of-specific-human-leucocyte-antigen-gene-variant
#15
Markus Kraemer, Jana Becker, Peter A Horn, Jan Claudius Schwitalla, Kathy Keyvani, Imke Metz, Christiane Wegner, Wolfgang Brück, Marc Schlamann, Falko M Heinemann, Peter Berlit
OBJECTIVES: The etiology and genetic susceptibility of primary central nervous system vasculitis (PCNSV) are still unclear. PATIENTS AND METHODS: We analyzed the DNA of 25 Caucasian patients with PCNSV for human leucocyte antigen genes HLA-A, HLA-B, HLA-DRB1, and HLA-DQB1, respectively. HLA-frequencies of the 25 patients with PCNSV were compared with HLA-frequencies of matched Caucasian controls. RESULTS: No statistically significant associations were found for HLA-B, HLA-DR1 and HLA-DQB1 variant...
June 23, 2017: Clinical Neurology and Neurosurgery
https://www.readbyqxmd.com/read/28734231/weight-misperception-and-disordered-weight-control-behaviors-among-u-s-high-school-students-with-overweight-and-obesity-associations-and-trends-1999-2013
#16
Vivienne M Hazzard, Samantha L Hahn, Kendrin R Sonneville
OBJECTIVE: To examine prevalence of weight misperception (incongruence between one's perceived weight status and one's actual weight status) and disordered weight control behaviors (DWCBs; unhealthy behaviors aiming to control or modify weight), associations between weight misperception and DWCBs, and temporal trends in prevalence and associations among adolescents with overweight and obesity from 1999 to 2013. METHODS: Self-reported data from eight biennial cycles (1999-2013) of the cross-sectional national Youth Risk Behavior Survey were used in analyses restricted to respondents with overweight/obesity...
July 13, 2017: Eating Behaviors
https://www.readbyqxmd.com/read/28734230/simultaneous-scanning-tunneling-microscopy-and-synchrotron-x-ray-measurements-in-a-gas-environment
#17
Rik V Mom, Willem G Onderwaater, Marcel J Rost, Maciej Jankowski, Sabine Wenzel, Leon Jacobse, Paul F A Alkemade, Vincent Vandalon, Matthijs A van Spronsen, Matthijs van Weeren, Bert Crama, Peter van der Tuijn, Roberto Felici, Wilhelmus M M Kessels, Francesco Carlà, Joost W M Frenken, Irene M N Groot
A combined X-ray and scanning tunneling microscopy (STM) instrument is presented that enables the local detection of X-ray absorption on surfaces in a gas environment. To suppress the collection of ion currents generated in the gas phase, coaxially shielded STM tips were used. The conductive outer shield of the coaxial tips can be biased to deflect ions away from the tip core. When tunneling, the X-ray-induced current is separated from the regular, 'topographic' tunneling current using a novel high-speed separation scheme...
July 14, 2017: Ultramicroscopy
https://www.readbyqxmd.com/read/28734226/inhibition-of-prb-pathway-differentially-modulates-apoptosis-in-esophageal-cancer-cells
#18
Rossana C Soletti, Deborah Biasoli, Nathassya A L V Rodrigues, João M A Delou, Renata Maciel, Vera L A Chagas, Rodrigo A P Martins, Stevens K Rehen, Helena L Borges
Esophageal cancer is the sixth most common cause of cancer-related death worldwide. Current chemotherapy regimens include a combination of 5-fluorouracil (5-FU) and cisplatin, but more efficient therapy strategies are needed to increase 5-year survival. Alterations in the signaling pathway of the tumor suppressor gene Rb-1, which encodes a phosphoprotein (pRB) that negatively regulates the G1/S transition of the cell cycle, are present in 70% of all tumors, but its role in esophageal cancer is still unclear...
July 19, 2017: Translational Oncology
https://www.readbyqxmd.com/read/28734215/dna-damage-and-cytotoxicity-induced-on-common-carp-by-pollutants-in-water-from-an-urban-reservoir-mad%C3%A3-n-reservoir-a-case-study
#19
I Pérez-Coyotl, C Martínez-Vieyra, M Galar-Martínez, L M Gómez-Oliván, S García-Medina, H Islas-Flores, R Pérez-Pasten Borja, E Gasca-Pérez, K A Novoa-Luna, O Dublán-García
Madín Reservoir provides a substantial amount of drinking water to two municipalities close to Mexico City metropolitan area. However, it receives untreated wastewater discharges from domestic sources in the towns of Nuevo Madín and others, as well as diverse pollutants which are hauled by the Río Tlalnepantla from its upper reaches, so that the xenobiotics in the reservoir are highly diverse in terms of type and quantity. Previous studies showed that MR is contaminated with xenobiotics such as Al, Hg and Fe, as well as NSAIDs, at concentrations exceeding the limits established for aquatic life protection...
July 18, 2017: Chemosphere
https://www.readbyqxmd.com/read/28734211/organotropism-of-methylmercury-in-fish-of-the-southeastern-of-brazil
#20
L S Azevedo, M G Almeida, W R Bastos, M S Suzuki, M C N N Recktenvald, M T S Bastos, C S Vergílio, C M M de Souza
This is one of the first studies to evaluate the effect of biometric variables (total length and weight), diet, and abiotic matrices (sediment and water column) on the bioaccumulation of methylmercury in tissues (muscle, liver, and gills) of four fish (two carnivore-invertivores, Pimelodus fur and Pachyurus adspersus; one carnivore-piscivore, Oligosarcus hepsetus; and one omnivore, Pimelodella lateristriga) in the lower section of a river in southeastern Brazil. Samples of fish (n = 120), water (n = 5) and sediment (n = 5) were collected at five sites characterized by pollution with mercury due to the use of organomercury fungicides and stream bed gold mining, commonly carried out in that section of the river in the 1980s...
July 17, 2017: Chemosphere
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