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https://www.readbyqxmd.com/read/28432992/bioaccumulation-kinetics-of-copper-in-ruditapes-philippinarum-exposed-to-increasing-continuous-and-pulsed-exposure-implications-for-growth
#1
Lígia M B M Santana, Julián Blasco, Denis M S Abessa, Olivia Campana
Metal bioaccumulation and toxicity to aquatic organisms depends on factors such as magnitude, duration and frequency of the exposure. The type of the exposure affects the toxicokinetic processes in the organisms. In this study, we carried out 30-day toxicity tests on juveniles of Ruditapes philippinarum exposed to increasing, continuous and pulsed exposure. Organisms were exposed to copper-spiked sediments followed by a 10-day recovery period. We assessed the interaction between the kinetics of subcellular copper partitioning and the growth response...
April 19, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28432983/improved-resolution-and-simplification-of-the-spin-diffusion-based-nmr-method-for-the-structural-analysis-of-mixed-linker-mofs
#2
Andraž Krajnc, Bart Bueken, Dirk De Vos, Gregor Mali
Nuclear magnetic resonance spectroscopy combined with modeling represents a powerful tool for the structural analysis of heterogeneous materials. In this contribution we describe an upgraded method, particularly suited for the structural analysis of mixed-linker metal-organic framework materials, which is based on the measurement and modeling of proton spin diffusion among constituents. We tested the method on a UiO-66-type metal-organic material, in which the organic building units were 1,4-benzenedicarboxylate and trans-1,4-cyclohexanedicarboxylate anions distributed within the framework in an unknown manner...
April 12, 2017: Journal of Magnetic Resonance
https://www.readbyqxmd.com/read/28432981/hidden-markov-model-and-chapman-kolmogrov-for-protein-structures-prediction-from-images
#3
Md Sarwar Kamal, Linkon Chowdhury, Mohammad Ibrahim Khan, Amira S Ashour, João Manuel R S Tavares, Nilanjan Dey
Protein structure prediction and analysis are more significant for living organs to perfect asses the living organ functionalities. Several protein structure prediction methods use neural network (NN). However, the Hidden Markov model is more interpretable and effective for more biological data analysis compared to the NN. It employs statistical data analysis to enhance the prediction accuracy. The current work proposed a protein prediction approach from protein images based on Hidden Markov Model and Chapman Kolmogrov equation...
April 13, 2017: Computational Biology and Chemistry
https://www.readbyqxmd.com/read/28432977/effect-of-short-term-zn-pb-or-long-term-multi-metal-stress-on-physiological-and-morphological-parameters-of-metallicolous-and-nonmetallicolous-echium-vulgare-l-populations
#4
Sławomir Dresler, Magdalena Wójciak-Kosior, Ireneusz Sowa, Grzegorz Stanisławski, Izabela Bany, Małgorzata Wójcik
The aim of the study was to determine the response of metallicolous and nonmetallicolous Echium vulgare L. populations to chronic multi-metal (Zn, Pb, Cd) and acute Zn (200, 400 μM) and Pb (30, 60 μM) stress. Three populations of E. vulgare, one from uncontaminated and two from metal-contaminated areas, were studied. Two types of experiments were performed - a short-term hydroponic experiment with acute Zn or Pb stress and a long-term manipulative soil experiment with the use of soils from the sites of origin of the three populations...
April 13, 2017: Plant Physiology and Biochemistry: PPB
https://www.readbyqxmd.com/read/28432976/cuticular-wax-coverage-and-composition-differ-among-organs-of-taraxacum-officinale
#5
Yanjun Guo, Lucas Busta, Reinhard Jetter
Primary plant surfaces are coated with hydrophobic cuticular waxes to minimize non-stomatal water loss. Wax compositions differ greatly between plant species and, in the few species studied systematically so far, also between organs, tissues, and developmental stages. However, the wax mixtures of more species in diverse plant families must be investigated to assess overall wax variability, and ultimately to correlate organ-specific composition with local water barrier properties. Here, we present comprehensive analyses of the waxes covering five organs of Taraxacum officinale (dandelion), to help close a gap in our understanding of wax chemistry in the Asteraceae family...
April 6, 2017: Plant Physiology and Biochemistry: PPB
https://www.readbyqxmd.com/read/28432972/assessment-of-the-bioavailability-and-depuration-of-uranium-cesium-and-thorium-in-snails-cantareus-aspersus-using-kinetics-models
#6
B Pauget, A Villeneuve, P O Redon, A Cuvier, A de Vaufleury
Uranium ore waste has led to soil contamination that may affect both environmental and soil health. To analyze the risk of metal transfer, metal bioavailability must be estimated by measuring biological parameters. Kinetic studies allow taking into account the dynamic mechanisms of bioavailability, as well as the steady state concentration in organisms necessary to take into account for relevant risk assessment. In this way, this work aims to model the snail accumulation and excretion kinetics of uranium (U), cesium (Cs) and thorium (Th)...
April 7, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28432970/insights-into-key-factors-controlling-go-stability-in-natural-surface-waters
#7
Yang Gao, Xuemei Ren, Xiaoli Tan, Tasawar Hayat, Ahmed Alsaedi, Changlun Chen
The effects of pH, cations (Na(+), K(+), Mg(2+), Ca(2+) and Al(3+)), and anions (Cl(-), HCO3(-), HPO4(2-) and SO4(2-)) on graphene oxide (GO) stability were investigated to address the current limitations in the knowledge regarding the stability of GO in natural surface water and its underlying mechanism. The threshold values of cations that destabilize GO were obtained and affected by both pH and anions. By employing elemental mapping and studying the effects of polyacrylic acid (PAA) on GO sedimentation and the re-dispersion of GO aggregates, we find that the GO aggregates induced by Na(+) and K(+) via electric double layer suppression and by Ca(2+) and Al(3+) via strong complxing are difficult to re-disperse completely...
April 11, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28432965/spatiotemporal-description-of-btex-volatile-organic-compounds-in-a-middle-eastern-megacity-tehran-study-of-exposure-prediction-for-environmental-health-research-tehran-sepehr
#8
Heresh Amini, Vahid Hosseini, Christian Schindler, Hossein Hassankhany, Masud Yunesian, Sarah B Henderson, Nino Künzli
The spatiotemporal variability of ambient volatile organic compounds (VOCs) in Tehran, Iran, is not well understood. Here we present the design, methods, and results of the Tehran Study of Exposure Prediction for Environmental Health Research (Tehran SEPEHR) on ambient concentrations of benzene, toluene, ethylbenzene, p-xylene, m-xylene, o-xylene (BTEX), and total BTEX. To date, this is the largest study of its kind in a low- and middle-income country and one of the largest globally. We measured BTEX concentrations at five reference sites and 174 distributed sites identified by a cluster analytic method...
April 19, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28432957/nanoencapsulation-strategies-for-the-delivery-of-novel-bifunctional-antioxidant-%C3%AF-1-selective-ligands
#9
Claudia Carbone, Emanuela Arena, Veronica Pepe, Orazio Prezzavento, Ivana Cacciatore, Hasan Turkez, Agostino Marrazzo, Antonio Di Stefano, Giovanni Puglisi
Nowadays sigma-1 receptors are considered as new therapeutic objectives for central nervous system neurodegenerative diseases. Among different molecules, alpha lipoic acid has been identified as a natural potent antioxidant drug, whose therapeutic efficacy is limited by its many drawbacks, such as fast metabolism, poor bioavailability and high physico-chemical instability. Alfa-lipoic acid derivatives have been recently developed demonstrating their neuroprotective activity and effectiveness in different types of oxidative stress...
April 12, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28432949/dominance-of-candidate-saccharibacteria-in-a-membrane-bioreactor-treating-medium-age-landfill-leachate-effects-of-organic-load-on-microbial-communities-hydrolytic-potential-and-extracellular-polymeric-substances
#10
Nikolaos Remmas, Paraschos Melidis, Ioanna Zerva, Jon Bent Kristoffersen, Sofia Nikolaki, George Tsiamis, Spyridon Ntougias
A membrane bioreactor (MBR), accomplishing high nitrogen removal efficiencies, was evaluated under various landfill leachate concentrations (50, 75 and 100% v/v). Proteinous and carbohydrate extracellular polymeric substances (EPS) and soluble microbial product (SMP) were strongly correlated (p<0.01) with organic load, salinity and NH4(+)-N. Exceptionally high β-glucosidase activities (6700-10,100Ug(-1)) were determined during MBR operation with 50% v/v leachate, as a result of the low organic carbon availability that extendedly induced β-glucosidases to breakdown the least biodegradable organic fraction...
April 10, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28432932/surveillance-of-vittaforma-corneae-in-hot-springs-by-a-small-volume-procedure
#11
Jung-Sheng Chen, Tsui-Kang Hsu, Bing-Mu Hsu, Tung-Yi Huang, Yu-Li Huang, Men-Fang Shaio, Dar-Der Ji
Vittaforma corneae is an obligate intracellular fungus and can cause human ocular microsporidiosis. Although accumulating reports of V. corneae causing keratoconjunctivitis in both healthy and immunocompromised persons have been published, little is known about the organism's occurrence in aquatic environments. Limitations in detection sensitivity have meant a large sampling volume is required to detect the pathogen up to now, which is problematic. A recent study in Taiwan has shown that some individuals suffering from microsporidial keratitis (MK) were infected after exposure to the pathogen at a hot spring...
April 19, 2017: Water Research
https://www.readbyqxmd.com/read/28432926/tick-borne-encephalitis-virus-infects-human-brain-microvascular-endothelial-cells-without-compromising-blood-brain-barrier-integrity
#12
Martin Palus, Marie Vancova, Jana Sirmarova, Jana Elsterova, Jan Perner, Daniel Ruzek
Alteration of the blood-brain barrier (BBB) is a hallmark of tick-borne encephalitis (TBE), a life-threating human viral neuroinfection. However, the mechanism of BBB breakdown during TBE, as well as TBE virus (TBEV) entry into the brain is unclear. Here, primary human microvascular endothelial cells (HBMECs) were infected with TBEV to study interactions with the BBB. Although the number of infected cells was relatively low in culture (<5%), the infection was persistent with high TBEV yields (>10(6)pfu/ml)...
April 19, 2017: Virology
https://www.readbyqxmd.com/read/28432916/colorimetric-method-for-the-detection-of-melamine-using-in-situ-formed-silver-nanoparticles-via-tannic-acid
#13
Md Fazle Alam, Amaj Ahmed Laskar, Shahbaz Ahmed, Mohd Azfar Shaida, Hina Younus
Melamine toxicity has recently attracted worldwide attention as it causes renal failure and the death of humans and animals. Therefore, developing a simple, fast and sensitive method for the routine detection of melamine is the need of the hour. Herein, we have developed a selective colorimetric method for the detection of melamine in milk samples based upon in-situ formation of silver nanoparticles (AgNPs) via tannic acid. The AgNPs thus formed were characterized by UV-Visible spectrophotometer, transmission electron microscope (TEM), zetasizer and dynamic light scattering (DLS)...
April 17, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28432906/hydrophobic-and-hydrophilic-properties-of-pollutants-as-a-factor-influencing-their-redistribution-during-snowpack-melt
#14
Krystyna Kozioł, Katarzyna Kozak, Żaneta Polkowska
Glaciers accumulate organic pollutants delivered by snow. However, our understanding of the exact dynamics of organic pollutants in the snowpack relies primarily on laboratory experiments and mathematical models. To fill the gap related to the detailed field data, we have conducted observations of melting snow profiles in two locations and three different stages of melting on one High Arctic glacier, as well as in superimposed ice. We monitored the chemical concentrations of formaldehyde, phenols, short-chain carboxylic acids, polycyclic aromatic hydrocarbons (PAHs) and polychlorinated biphenyls (PCBs) and snow water equivalents to derive chemical loads...
April 19, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28432896/diabetes-incidence-and-influencing-factors-in-women-with-and-without-gestational-diabetes-mellitus-a-15year-population-based-follow-up-cohort-study
#15
Sonia Minooee, Fahimeh Ramezani Tehrani, Maryam Rahmati, Mohammad Ali Mansournia, Fereidoun Azizi
AIM: Very few extensive follow-up investigations evaluating patients with history of gestational diabetes mellitus (GDM) have been documented. We conducted this longitudinal study to estimate the incidence of diabetes and its predictors in women with and without GDM. METHOD: A total of 2458 eligible women, aged 20-50years (476 with GDM and 1982 without GDM) were selected from among participants of the Tehran Lipid and Glucose study, based on the World Health Organization definition for GDM screening...
April 8, 2017: Diabetes Research and Clinical Practice
https://www.readbyqxmd.com/read/28432890/characterization-of-spectral-responses-of-dissolved-organic-matter-dom-for-atrazine-binding-during-the-sorption-process-onto-black-soil
#16
Yifan Wang, Xinyuan Zhang, Xing Zhang, Qingjuan Meng, Fengjie Gao, Ying Zhang
This study was aim to investigate the interaction between soil-derived dissolved organic matter (DOM) and atrazine as a kind of pesticides during the sorption process onto black soil. According to the experimental data, the adsorption capacity of Soil + DOM, Soil and DOM were 41.80, 31.45 and 9.35 mg kg(-1), separately, which indicated that DOM significantly enhanced the adsorption efficiency of atrazine by soil. Data implied that the pseudo-second-order kinetic equation could well explain the adsorption process...
April 14, 2017: Chemosphere
https://www.readbyqxmd.com/read/28432885/from-laboratory-to-field-studies-the-assessment-of-biscutella-laevigata-suitability-to-biological-reclamation-of-areas-contaminated-with-lead-and-cadmium
#17
Ewa Muszyńska, Ewa Hanus-Fajerska, Barbara Piwowarczyk, Joanna Augustynowicz, Krystyna Ciarkowska, Tomasz Czech
The aim of the work was to evaluate the usefulness of the in vitro multiplication of Biscutella laevigata calamine ecotype for in situ reclamation of post-flotation wastes polluted with Pb and Cd. The experiment was conducted on three steps: (i) plant shoots' production under in vitro condition, (ii) establishment of the material in greenhouse experiment, and finally (iii) field cultivation directly on the mining-waste heap of Olkusz Ore-Bearing Region, Poland. This region is known to be one of the most chemically-degraded area in central Europe...
April 19, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28432880/immobilization-of-cu-zn-cd-and-pb-in-mine-drainage-stream-sediment-using-chinese-loess
#18
Fei Zang, Shengli Wang, Zhongren Nan, Jianmin Ma, Yepu Li, Qian Zhang, Yazhou Chen
The in situ immobilization of metal-contaminated sediment, using various amendments, has attracted great attention owing to their cost-effectiveness. The present study investigated the effectiveness of Chinese loess on Cu, Zn, Cd and Pb stabilization by decreasing their bioavailability in contaminated sediment. The loess was mixed with the sediment in doses of 0, 0.5, 1, 2, 5, 10 and 20 kg. Approximately 70 d after loess application, the effectiveness was evaluated using the Tessier sequential extraction procedure and single extractants, including ethylenediaminetetraacetic acid disodium salt (EDTA-2Na), diethylenetriaminepentaacetic acid (DTPA), calcium chloride (CaCl2) and hydrochloric acid (HCl)...
April 17, 2017: Chemosphere
https://www.readbyqxmd.com/read/28432879/seasonal-variation-and-health-risk-assessment-of-organochlorine-compounds-in-urban-soils-of-novi-sad-serbia
#19
Biljana D Škrbić, Vesna Marinković, Igor Antić, Anita Petrović Gegić
The aim of this paper was to determine spatial and seasonal variation of 6 indicator polychlorinated biphenyls (PCBs) and 18 organochlorine pesticides (OCPs) in urban soils of Novi Sad, Serbia. Sixty surface soil samples were collected during both winter and summer season, from different types of locations: schools, recreational areas, residential and industrial zones. Samples were treated using the method of accelerated solvent extraction, which allows simultaneous extraction and clean up of PCBs and OCPs...
April 15, 2017: Chemosphere
https://www.readbyqxmd.com/read/28432858/regulatory-function-of-parasites-in-autoimmune-disease-%C3%A2-outcome-from-experimental-model-infection
#20
Katarzyna Krawczak, Katarzyna Donskow-Łysoniewska, Maria Doligalska
It is estimated that more than half of the nowadays known species are pathogenic parasites. Among macroparasites gastrointestinal nematodes are one of most common and having significant impact on life and health. Those organisms reveal strong, specific immune response in host, involving primary mechanisms associated with regulatory and Th2 cells. Referring to immunomodulatory abilities of helminths, parasite infections started to be considered as a possible therapy for many autoimmune diseases. Clinical trials on 2nd and 3rd stage are conducted in spite that treatment has not been recognized as safe for common use...
2017: Annals of Parasitology
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