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https://www.readbyqxmd.com/read/29332273/pollution-and-ecological-risk-assessment-of-nutrients-associated-with-deposited-sediments-collected-from-roof-and-road-surfaces
#1
Xiao Wu, Jianghua Yu, Hui Qiu, Hua Fang
Surface-deposited sediment in urban areas is an essential environmental medium for assessing nutrient contamination. The total nitrogen (TN) and total phosphorus (TP) pollution associated with surface-deposited sediments can be transported into urban water bodies by runoff and can cause eutrophication of those water bodies. By analyzing the samples collected on roof surfaces and road surfaces, this study provides a comparison of the differences in TN and TP pollution loading in sediments on these two different impervious surface materials...
January 13, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29332216/characteristics-of-arg-carrying-plasmidome-in-the-cultivable-microbial-community-from-wastewater-treatment-system-under-high-oxytetracycline-concentration
#2
Yanhong Shi, Hong Zhang, Zhe Tian, Min Yang, Yu Zhang
Studies on antibiotic production wastewater have shown that even a single antibiotic can select for multidrug resistant bacteria in aquatic environments. It is speculated that plasmids are an important mechanism of multidrug resistance (MDR) under high concentrations of antibiotics. Herein, two metagenomic libraries were constructed with plasmid DNA extracted from cultivable microbial communities in a biological wastewater treatment reactor supplemented with 0 (CONTROL) or 25 mg/L of oxytetracycline (OTC-25)...
January 13, 2018: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/29332180/cd39-adenosinergic-axis-in-renal-pathophysiology-and-therapeutics
#3
REVIEW
Bellamkonda K Kishore, Simon C Robson, Karen M Dwyer
Extracellular ATP interacts with purinergic type 2 (P2) receptors and elicits many crucial biological functions. Extracellular ATP is sequentially hydrolyzed to ADP and AMP by the actions of defined nucleotidases, such as CD39, and AMP is converted to adenosine, largely by CD73, an ecto-5'-nucleotidase. Extracellular adenosine interacts with P1 receptors and often opposes the effects of P2 receptor activation. The balance between extracellular ATP and adenosine in the blood and extracellular fluid is regulated chiefly by the activities of CD39 and CD73, which constitute the CD39-adenosinergic axis...
January 13, 2018: Purinergic Signalling
https://www.readbyqxmd.com/read/29331914/pore-diffusion-limits-removal-of-monochloramine-in-treatment-of-swimming-pool-water-using-granular-activated-carbon
#4
Bertram Skibinski, Christoph Götze, Eckhard Worch, Wolfgang Uhl
Overall apparent reaction rates for the removal of monochloramine (MCA) in granular activated carbon (GAC) beds were determined using a fixed-bed reactor system and under conditions typical for swimming pool water treatment. Reaction rates dropped and quasi-stationary conditions were reached quickly. Diffusional mass transport in the pores was shown to be limiting the overall reaction rate. This was reflected consistently in the Thiele modulus, in the effect of temperature, pore size distribution and of grain size on the reaction rates...
December 26, 2017: Water Research
https://www.readbyqxmd.com/read/29331560/the-effects-of-sediment-transport-on-temporal-variation-in-radiocesium-concentrations-in-very-shallow-water-off-the-southern-coast-of-fukushima-japan
#5
Akira Matsumoto, Hiroshi Myouse, Hisayuki Arakawa, Ken Higuchi, Naoto Hirakawa, Yoshiaki Morioka, Takuji Mizuno
We studied the very shallow coastal water off Iwaki City, Fukushima Prefecture, and investigated: (1) temporal variation in 137Cs concentrations; (2) particle-size distribution of sediments; and (3) the effect on variation by waves, component-fractionated concentration of radiocesium and mineral composition at three sampling stations (Yotsukura, Ena rocky reef and Ena sandy station). There was a decline in 137Cs concentrations in sediment samples at all sampling stations between 425 and 1173 days after the accident...
January 11, 2018: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/29331134/coarse-grained-model-of-nanoscale-segregation-water-diffusion-and-proton-transport-in-nafion-membranes
#6
Aleksey Vishnyakov, Runfang Mao, Ming-Tsung Lee, Alexander V Neimark
We present a coarse-grained model of the acid form of Nafion membrane that explicitly includes proton transport. This model is based on a soft-core bead representation of the polymer implemented into the dissipative particle dynamics (DPD) simulation framework. The proton is introduced as a separate charged bead that forms dissociable Morse bonds with water beads. Morse bond formation and breakup artificially mimics the Grotthuss hopping mechanism of proton transport. The proposed DPD model is parameterized to account for the specifics of the conformations and flexibility of the Nafion backbone and sidechains; it treats electrostatic interactions in the smeared charge approximation...
January 14, 2018: Journal of Chemical Physics
https://www.readbyqxmd.com/read/29330527/aquaglyceroporin-pbaqp-is-required-for-efficient-progression-through-the-liver-stage-of-plasmodium-infection
#7
Dominique Promeneur, Godfree Mlambo, Peter Agre, Isabelle Coppens
The discovery of aquaglyceroporins (AQP) has highlighted a new mechanism of membrane solute transport that may hold therapeutic potential for controlling parasitic infections, including malaria. Plasmodium parasites express a single AQP at the plasma membrane that functions as a channel for water, nutrients and waste into and out cells. We previously demonstrated that Plasmodium berghei targeted for PbAQP deletion are deficient in glycerol import and less virulent than wild-type parasites during the blood developmental stage...
January 12, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29329939/enhanced-mobility-of-non-aqueous-phase-liquid-napl-during-drying-of-wet-sand
#8
Dhivakar Govindarajan, Abhijit P Deshpande, Ravikrishna Raghunathan
Enhanced upward mobility of a non aqueous phase liquid (NAPL) present in wet sand during natural drying, and in the absence of any external pressure gradients, is reported for the first time. This mobility was significantly higher than that expected from capillary rise. Experiments were performed in a glass column with a small layer of NAPL-saturated sand trapped between two layers of water-saturated sand. Drying of the wet sand was induced by flow of air across the top surface of the wet sand. The upward movement of the NAPL, in the direction of water transport, commenced when the drying effect reached the location of the NAPL and continued as long as there was significant water evaporation in the vicinity of NAPL, indicating a clear correlation between the NAPL rise and water evaporation...
January 4, 2018: Journal of Contaminant Hydrology
https://www.readbyqxmd.com/read/29329092/effect-of-aspirin-on-the-pharmacokinetics-and-absorption-of-panax-notoginseng-saponins
#9
Zhihao Tian, Huanhuan Pang, Qiang Zhang, Shouying Du, Yang Lu, Lin Zhang, Jie Bai, Pengyue Li, Danqi Li, Mengdi Zhao, Xiaonan Chen
BACKGROUND: Panax notoginseng saponins, a traditional Chinese medicine extraction, and aspirin are both widely used to treat cerebral infarction in China. Good results in clinical practice have been achieved, when Panax notoginseng saponins was taken together with aspirin. METHODS: To investigate the interaction of the two drugs in vivo, the concentration of notoginsenoside R1, ginsenoside Rg1, Rb1, Re and Rd. in blood were simultaneously measured by UPLC/MS/MS...
January 2, 2018: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/29329037/phloem-function-a-key-to-understanding-and-manipulating-plant-responses-to-rising-atmospheric-co2
#10
REVIEW
Elizabeth A Ainsworth, Pauline Lemonnier
Increasing atmospheric carbon dioxide concentration ([CO2]) directly stimulates photosynthesis and reduces stomatal conductance in C3 plants. Both of these physiological effects have the potential to alter phloem function at elevated [CO2]. Recent research has clearly established that photosynthetic capacity is correlated to vascular traits associated with phloem loading and water transport, but the effects of elevated [CO2] on these relationships are largely unexplored. Plants also employ different strategies for loading sucrose and other sugars into the phloem, and there is potential for species with different phloem loading strategies to respond differently to elevated [CO2]...
January 9, 2018: Current Opinion in Plant Biology
https://www.readbyqxmd.com/read/29328684/hydrodynamic-signatures-of-stationary-marangoni-driven-surfactant-transport
#11
M M Bandi, V S Akella, D K Singh, R S Singh, S Mandre
We experimentally study steady Marangoni-driven surfactant transport on the interface of a deep water layer. Using hydrodynamic measurements, and without using any knowledge of the surfactant physicochemical properties, we show that sodium dodecyl sulphate and Tergitol 15-S-9 introduced in low concentrations result in a flow driven by adsorbed surfactant. At higher surfactant concentration, the flow is dominated by the dissolved surfactant. Using camphoric acid, whose properties are a priori unknown, we demonstrate this method's efficacy by showing its spreading is adsorption dominated...
December 29, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/29328674/new-insights-on-ecosystem-mercury-cycling-revealed-by-stable-isotopes-of-mercury-in-water-flowing-from-a-headwater-peatland-catchment
#12
Glenn Woerndle, Martin Tsz-Ki Tsui, Stephen Sebestyen, Joel D Blum, Xiangping Nie, Randall K Kolka
Stable isotope compositions of mercury (Hg) were measured in the outlet stream and in soil cores at different landscape positions in a 9.7-ha boreal upland-peatland catchment in northern Minnesota. An acidic permanganate/persulfate digestion procedure was validated for water samples with high dissolved organic matter (DOM) concentrations and we verified the complete breakdown of DOM through Hg spike addition analysis. We report a relatively large variation in mass-dependent fractionation (δ202Hg; from -2.12 to -1...
January 12, 2018: Environmental Science & Technology
https://www.readbyqxmd.com/read/29326974/the-largest-deep-ocean-silicic-volcanic-eruption-of-the-past-century
#13
Rebecca Carey, S Adam Soule, Michael Manga, James White, Jocelyn McPhie, Richard Wysoczanski, Martin Jutzeler, Kenichiro Tani, Dana Yoerger, Daniel Fornari, Fabio Caratori-Tontini, Bruce Houghton, Samuel Mitchell, Fumihiko Ikegami, Chris Conway, Arran Murch, Kristen Fauria, Meghan Jones, Ryan Cahalan, Warren McKenzie
The 2012 submarine eruption of Havre volcano in the Kermadec arc, New Zealand, is the largest deep-ocean eruption in history and one of very few recorded submarine eruptions involving rhyolite magma. It was recognized from a gigantic 400-km2 pumice raft seen in satellite imagery, but the complexity of this event was concealed beneath the sea surface. Mapping, observations, and sampling by submersibles have provided an exceptionally high fidelity record of the seafloor products, which included lava sourced from 14 vents at water depths of 900 to 1220 m, and fragmental deposits including giant pumice clasts up to 9 m in diameter...
January 2018: Science Advances
https://www.readbyqxmd.com/read/29325002/traits-and-trade-offs-in-whole-tree-hydraulic-architecture-along-the-vertical-axis-of-eucalyptus-grandis
#14
Sebastian Pfautsch, Michael J Aspinwall, John E Drake, Larissa Chacon-Doria, Rob J A Langelaan, David T Tissue, Mark G Tjoelker, Frederic Lens
Background and Aims: Sapwood traits like vessel diameter and intervessel pit characteristics play key roles in maintaining hydraulic integrity of trees. Surprisingly little is known about how sapwood traits covary with tree height and how such trait-based variation could affect the efficiency of water transport in tall trees. This study presents a detailed analysis of structural and functional traits along the vertical axes of tall Eucalyptus grandis trees. Methods: To assess a wide range of anatomical and physiological traits, light and electron microscopy was used, as well as field measurements of tree architecture, water use, stem water potential and leaf area distribution...
January 9, 2018: Annals of Botany
https://www.readbyqxmd.com/read/29324998/introducing-turgor-driven-growth-dynamics-into-functional-structural-plant-models
#15
Jonas R Coussement, Tom De Swaef, Peter Lootens, Isabel Roldán-Ruiz, Kathy Steppe
Background and Aims: In many scenarios the availability of assimilated carbon is not the constraining factor of plant growth. Rather, organ growth appears driven by sink activity in which water availability plays a determinant role. Current functional-structural plant models (FSPMs) mainly focus on plant-carbon relations and largely disregard the importance of plant water status in organogenesis. Consequently, incorporating a turgor-driven growth concept, coupling carbon and water dynamics in an FSPM, presents a significant improvement towards capturing plant development in a more mechanistic manner...
January 9, 2018: Annals of Botany
https://www.readbyqxmd.com/read/29323917/effects-of-acyl-chain-unsaturation-on-activation-energy-of-water-permeability-across-droplet-bilayers-of-homologous-monoglycerides-role-of-cholesterol
#16
Maria Lopez, Jacqueline Denver, Sue Ellen Evangelista, Alessandra Armetta, Gabriella Di Domizio, Sunghee Lee
Cholesterol is an important component of total lipid in mammalian cellular membranes, hence the knowledge of its association with lipid bilayer membranes will be essential to understanding membrane structure and function. A Droplet Interface Bilayer (DIB) provides a convenient and reliable platform through which permeability coefficient and activation energy for water transport across the membrane can be made. In this study, we investigated the effect of acyl chain structure in amphiphilic monoglycerides on the permeability of water across DIB membranes composed of cholesterol and these monoglycerides, where the acyl chain length, number of double bonds, and the position of double bond are varied systematically along the acyl chains...
January 11, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29323869/dual-functional-superhydrophobic-textile-with-asymmetric-roll-down-pinned-states-for-water-droplet-transportation-and-oil-water-separation
#17
Xiaojing Su, Hongqiang Li, Xuejun Lai, Lin Zhang, Xiaofeng Liao, Jing Wang, Zhonghua Chen, Jie He, Xingrong Zeng
Superhydrophobic surfaces with tunable adhesion from lotus-leaf to rose-petal states have aroused much attention for their potential applications in self-cleaning, anti-icing, oil-water separation, microdroplet transportation and microfluidic devices. Herein, we report a facile magnetic-field-manipulation strategy to fabricating dual-functional superhydrophobic textile with asymmetric roll-down/pinned states on the two surfaces of textile simultaneously. Upon exposure to a static magnetic field, fluoroalkylsilane modified iron oxide (F-Fe3O4) nanoparticles in polydimethylsiloxane (PDMS) moved along the magnetic field to construct discrepant hierarchical structures and roughnesses on the two sides of textile...
January 11, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29323672/quantitative-raman-microspectroscopy-for-water-permeability-parameters-at-a-droplet-interface-bilayer
#18
S Braziel, K Sullivan, S Lee
Using confocal Raman microspectroscopy, we derive parameters for bilayer water transport across an isolated nanoliter aqueous droplet pair. For a bilayer formed with two osmotically imbalanced and adherent nanoliter aqueous droplets in a surrounding oil solvent, a droplet interface bilayer (DIB), the water permeability coefficient across the lipid bilayer was determined from monitoring the Raman scattering from the C[triple bond, length as m-dash]N stretching mode of K3Fe(CN)6 as a measure of water uptake into the swelling droplet of a DIB pair...
January 11, 2018: Analyst
https://www.readbyqxmd.com/read/29323498/scaling-laws-in-directional-spreading-of-droplets-on-wettability-confined-diverging-tracks
#19
Uddalok Sen, Souvick Chatterjee, Ranjan Ganguly, Richard Dodge, Lisha Yu, Constantine M Megaridis
Spontaneous pumpless transport of droplets on wettability-confined tracks is important for various applications, such as rapid transport and mixing of fluid droplets, enhanced dropwise condensation, biomedical devices, etc. Recent studies have shown that on an open surface, a superhydrophilic track of diverging width, laid on a superhydrophobic background, facilitates the transport of water from the narrower end to the wider end at unprecedented rates (up to 40 cm/s), without external actuation. Keeping in mind that such designs play a key role for a diverse range of applications handling organic liquids and in point-of-care devices, the importance of characterizing the spreading behavior of viscous liquids on such surfaces cannot be over-emphasized...
January 11, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29322818/evolution-of-ph-buffers-and-water-homeostasis-in-eukaryotes-homology-between-humans-and-acanthamoeba-proteins
#20
Abdul M Baig, R Zohaib, S Tariq, H R Ahmad
AIM: This study intended to trace the evolution of acid-base buffers and water homeostasis in eukaryotes. Acanthamoeba castellanii  was selected as a model unicellular eukaryote for this purpose. Homologies of proteins involved in pH and water regulatory mechanisms at cellular levels were compared between humans and A. castellanii. MATERIALS & METHODS: Amino acid sequence homology, structural homology, 3D modeling and docking prediction were done to show the extent of similarities between carbonic anhydrase 1 (CA1), aquaporin (AQP), band-3 protein and H+ pump...
January 11, 2018: Future Microbiology
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