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https://www.readbyqxmd.com/read/29156594/chemical-transformations-in-proto-cytoplasmic-media-phosphorus-coupling-in-the-silica-hydrogel-phase
#1
Ian B Gorrell, Timothy W Henderson, Kamal Albdeery, Philip M Savage, Terence P Kee
It has been proposed that prebiotic chemical studies on the emergence of primitive life would be most relevant when performed in a hydrogel, rather than an aqueous, environment. In this paper we describe the ambient temperature coupling of phosphorus oxyacids [Pi] mediated by Fe(II) under aerobic conditions within a silica hydrogel (SHG) environment. We have chosen to examine SHGs as they have considerable geological precedence as key phases in silicification en route to rock formation. Following a description of the preparation and characterization studies on our SHG formulations, coupling experiments between Pi species are described across multiple permutations of (i) Pi compound; (ii) gel formulation; (iii) metal salt additive; and (iv) pH-modifying agent...
November 19, 2017: Life
https://www.readbyqxmd.com/read/29156433/evaluating-features-of-periphytic-diatom-communities-as-biomonitoring-tools-in-fresh-brackish-and-marine-waters
#2
Lalit K Pandey, Yogesh Chandra Sharma, Jihae Park, Soyeon Choi, Hojun Lee, Jie Lyu, Taejun Han
The aims of this study were to assess the biodiversity of periphytic diatom assemblages in fresh, brackish and marine waterbodies of Korea, and to assess the effect of environmental and anthropogenic factors on parameters such as the quantity and biovolume of lipid bodies and deformations of diatoms as early warning measures of anthropogenic impact. Diatom samples were collected from 31 sites (14 freshwater, 10 brackish and 7 marine), which included less impacted (upstream) and impacted (downstream) sites in each water type...
November 10, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/29156332/effective-flocculation-of-microcystis-aeruginosa-with-simultaneous-nutrient-precipitation-from-hydrolyzed-human-urine
#3
Yan-Shan Wang, Zhong-Hua Tong, Long-Fei Wang, Guo-Ping Sheng, Han-Qing Yu
Mechanical harvest of massive harmful algal blooms is an effective measure for bloom mitigation. Yet subsequent processing of the resulting water from algae water separation after the harvesting becomes a new problem since individual algal cells or small algal aggregates are still present in the water. Here, we proposed a novel approach for effectively flocculating the cyanobacteria Microcystis aeruginosa with a removal efficiency of 97% in 6 h using hydrolyzed urine. Nitrogen and phosphorus were simultaneously reclaimed through struvite formation...
November 11, 2017: Chemosphere
https://www.readbyqxmd.com/read/29156279/the-stocks-and-flows-of-nitrogen-phosphorus-and-potassium-across-a-30-year-time-series-for-agriculture-in-huantai-county-china
#4
Jessica Bellarby, Ben W J Surridge, Philip M Haygarth, Kun Liu, Giuseppina Siciliano, Laurence Smith, Clive Rahn, Fanqiao Meng
In order to improve the efficiency of nutrient use whilst also meeting projected changes in the demand for food within China, new nutrient management frameworks comprised of policy, practice and the means of delivering change are required. These frameworks should be underpinned by systemic analyses of the stocks and flows of nutrients within agricultural production. In this paper, a 30-year time series of the stocks and flows of nitrogen (N), phosphorus (P) and potassium (K) are reported for Huantai county, an exemplar area of intensive agricultural production in the North China Plain...
November 17, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29156271/fresh-and-composted-industrial-sludge-restore-soil-functions-in-surface-soil-of-degraded-agricultural-land
#5
Muhammad Saleem Arif, Muhammad Riaz, Sher Muhammad Shahzad, Tahira Yasmeen, Muhammad Ashraf, Muhammad Siddique, Muhammad Salman Mubarik, Luca Bragazza, Alexandre Buttler
A field study was conducted to test the potential of 5-year consecutive application of fresh industrial sludge (FIS) and composted industrial sludge (CIS) to restore soil functions at surface (0-15cm) and subsurface (15-30cm) of the degraded agricultural land. Sludge amendments increased soil fertility parameters including total organic carbon (TOC), soil available nitrogen (SAN), soil available phosphorus (SAP) and soil available potassium (SAK) at 0-15cm depth. Soil enzyme activities i.e. dehydrogenase (DHA), β-glucosidase (BGA) and alkaline phosphatase (ALp) were significantly enhanced by FIS and CIS amendments in surface soil...
November 17, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29155875/effect-of-long-term-irrigation-patterns-on-phosphorus-forms-and-distribution-in-the-brown-soil-zone
#6
Chang Liu, Xiuli Dang, Melanie A Mayes, Leilei Chen, Yulong Zhang
Continuous application of P fertilizers under different irrigation patterns can change soil phosphorus (P) chemical behavior and increase soil P levels that are of environmental concern. To assess the effect of long-term different irrigation patterns on soil P fractions and availability, this study examined sequential changes in soil organic P and inorganic P from furrow irrigation (FI), surface drip irrigation (SUR), and subsurface drip irrigation (SDI) in the brown soil zone (0-60 cm) during 1998 to 2011...
2017: PloS One
https://www.readbyqxmd.com/read/29155841/habitat-and-soil-related-drivers-of-the-root-associated-fungal-community-of-quercus-suber-in-the-northern-moroccan-forest
#7
Fatima Zahra Maghnia, Younes Abbas, Frédéric Mahé, Benaissa Kerdouh, Estelle Tournier, Mohamed Ouadji, Pierre Tisseyre, Yves Prin, Naïma El Ghachtouli, Salah Eddine Bakkali Yakhlef, Robin Duponnois, Hervé Sanguin
Soil fungi associated with plant roots, notably ectomycorrhizal (EcM) fungi, are central in above- and below-ground interactions in Mediterranean forests. They are a key component in soil nutrient cycling and plant productivity. Yet, major disturbances of Mediterranean forests, particularly in the Southern Mediterranean basin, are observed due to the greater human pressures and climate changes. These disturbances highly impact forest cover, soil properties and consequently the root-associated fungal communities...
2017: PloS One
https://www.readbyqxmd.com/read/29155744/capturing-flow-weighted-water-and-suspended-particulates-from-agricultural-canals-during-drainage-events
#8
Jehangir H Bhadha, Anne Sexton, Timothy A Lang, Samira H Daroub
The purpose of this study is to describe the methods used to capture flow-weighted water and suspended particulates from farm canals during drainage discharge events. Farm canals can be enriched by nutrients such as phosphorus (P) that are susceptible to transport. Phosphorus in the form of suspended particulates can significantly contribute to the overall P loads in drainage water. A settling tank experiment was conducted to capture suspended particulates during discrete drainage events. Farm canal discharge water was collected in a series of two 200 L settling tanks over the entire duration of the drainage event, so as to represent a composite subsample of the water being discharged...
November 7, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/29155717/synthesis-of-high-purity-nonsymmetric-dialkylphosphinic-acid-extractants
#9
Junlian Wang, Meiying Xie, Xinyu Liu, Shengming Xu
We present the synthesis of (2,3-dimethylbutyl)(2,4,4'-trimethylpentyl)phosphinic acid as an example to demonstrate a method for the synthesis of high purity nonsymmetric dialkylphosphinic acid extractants. Low toxic sodium hypophosphite was chosen as the phosphorus source to react with olefin A (2,3-dimethyl-1-butene) to generate a monoalkylphosphinic acid intermediate. Amantadine was adopted to remove the dialkylphosphinic acid byproduct, as only the monoalkylphosphinic acid can react with amantadine to form an amantadine∙mono-alkylphosphinic acid salt, while the dialkylphosphinic acid cannot react with amantadine due to its large steric hindrance...
October 19, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/29155410/gate-tunable-strong-weak-localization-transition-in-few-layer-black-phosphorus
#10
Gen Long, Shuigang Xu, Xiangbin Cai, Zefei Wu, Tianyi Han, Jiangxiazi Lin, Chun Cheng, Yuan Cai, Xinran Wang, Ning Wang
Atomically-thin black phosphorus (BP) field effect transistors show strong-weak localization transition, which is tunable through gate voltages. Hopping transports through charge impurity-induced localized states are observed at low carrier density regime. Variable-range hopping model is applied to simulate scattering behaviors of charge carriers. In the high carrier concentration regime, a negative magnetoresistance indicates weak localization effects. The extracted phase coherence length is power-law temperature-dependent (~T<sup>-0...
November 20, 2017: Nanotechnology
https://www.readbyqxmd.com/read/29153257/pseudomonas-silesiensis-sp-nov-strain-a3-t-isolated-from-a-biological-pesticide-sewage-treatment-plant-and-analysis-of-the-complete-genome-sequence
#11
Michał A Kaminski, Ewa M Furmanczyk, Adam Sobczak, Andrzej Dziembowski, Leszek Lipinski
Microorganisms classified in to the Pseudomonas genus are a ubiquitous bacteria inhabiting variety of environmental niches and have been isolated from soil, sediment, water and different parts of higher organisms (plants and animals). Members of this genus are known for their metabolic versatility and are able to utilize different chemical compounds as a source of carbon, nitrogen or phosphorus, which makes them an interesting microorganism for bioremediation or bio-transformation. Moreover, Pseudomonas sp...
November 3, 2017: Systematic and Applied Microbiology
https://www.readbyqxmd.com/read/29152826/synthesis-and-reactivity-of-nickel-stabilised-%C3%A2%C2%B52-%C3%AE-2-%C3%AE-2-p2-as2-and-pas-units
#12
Gabriele Hierlmeier, Alexander Hinz, Robert Wolf, Jose Manuel Goicoechea
The reactivity of two paramagnetic nickel(I) compounds, CpNi(NHC) (where Cp = cyclopentadienyl; NHC = 1,3-bis(2,4,6-trimethylphenyl)-imidazol-2-ylidene (IMes) or 1,3-bis(2,6-diisopropylphenyl)-imidazol-2-ylidene (IPr)), towards [Na(dioxane)x][PnCO] (Pn = P, As) is described. These reactions afford symmetric bimetallic compounds (µ2:η2,η2-Pn2){Ni(NHC)(CO)}2. Several novel intermediates en route to such species are identified and characterised, including a compound containing the PCO- anion in an unprecedented µ2:η2,η2-binding mode...
November 20, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/29152175/divergent-scaling-of-respiration-rates-to-nitrogen-and-phosphorus-across-four-woody-seedlings-between-different-growing-seasons
#13
Ruirui Fan, Jun Sun, Fuchun Yang, Man Li, Yuan Zheng, Quanlin Zhong, Dongliang Cheng
Empirical studies indicate that the exponents governing the scaling of plant respiration rates (R) with respect to biomass (M) numerically vary between three-fourth for adult plants and 1.0 for seedlings and saplings and are affected by nitrogen (N) and phosphorus (P) content. However, whether the scaling of R with respect to M (or N and P) varies among different phylogenetic groups (e.g., gymnosperms vs. angiosperms) or during the growing and dormant seasons remains unclear. We measured the whole-plant R and M, and N and P content of the seedlings of four woody species during the growing season (early October) and the dormant season (January)...
November 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/29151982/the-effect-of-low-magnitude-low-frequency-vibrations-lmlf-on-osteogenic-differentiation-potential-of-human-adipose-derived-mesenchymal-stem-cells
#14
Monika Marędziak, Daniel Lewandowski, Krzysztof A Tomaszewski, Krzysztof Kubiak, Krzsztof Marycz
Introduction: In the current study, we investigated the effect of low magnitude, low frequency (LMLF) mechanical vibrations on the osteogenic differentiation potential of human adipose derived mesenchymal stem cells (hASC), taken from elderly patients. Methods: During 21 days in osteogenic culture medium, cells were periodically exposed to three different frequencies (25, 35 and 45 Hz) of continuous sinusoidal oscillation, using a vibration generator. We measured cell proliferation, cell morphology, calcium and phosphorus deposition using Almar Blue assay, fluorescence microscopy, scanning electron microscopy, and a EDX detector, respectively...
2017: Cellular and Molecular Bioengineering
https://www.readbyqxmd.com/read/29151885/treatment-of-old-landfill-leachate-with-high-ammonium-content-using-aerobic-granular-sludge
#15
Yanan Ren, Fernanda Ferraz, Abbass Jafari Kang, Qiuyan Yuan
Background: Aerobic granular sludge has become an attractive alternative to the conventional activated sludge due to its high settling velocity, compact structure, and higher tolerance to toxic substances and adverse conditions. Aerobic granular sludge process has been studied intensively in the treatment of municipal and industrial wastewater. However, information on leachate treatment using aerobic granular sludge is very limited. Methods: This study investigated the treatment performance of old landfill leachate with different levels of ammonium using two aerobic sequencing batch reactors (SBR): an activated sludge SBR (ASBR) and a granular sludge SBR (GSBR)...
2017: Journal of Biological Engineering
https://www.readbyqxmd.com/read/29151700/tenofovir-vs-lamivudine-plus-adefovir-in-chronic-hepatitis-b-tenosimp-b-study
#16
Manuel Rodríguez, Juan Manuel Pascasio, Enrique Fraga, Javier Fuentes, Martín Prieto, Gloria Sánchez-Antolín, José Luis Calleja, Esther Molina, María Luisa García-Buey, María Ángeles Blanco, Javier Salmerón, María Lucía Bonet, José Antonio Pons, José Manuel González, Miguel Ángel Casado, Francisco Jorquera, The Tenosimp-B Research Group
AIM: To demonstrate the non-inferiority (15% non-inferiority limit) of monotherapy with tenofovir disoproxil fumarate (TDF) vs the combination of lamivudine (LAM) plus adefovir dipivoxil (ADV) in the maintenance of virologic response in patients with chronic hepatitis B (CHB) and prior failure with LAM. METHODS: This study was a Phase IV prospective, randomized, open, controlled study with 2 parallel groups (TDF and LAM+ADV) of adult patients with hepatitis B e antigen (HBeAg)-negative CHB, prior failure with LAM, on treatment with LAM+ADV for at least 6 mo, without prior resistance to ADV and with an undetectable viral load at the start of the study, in 14 Spanish hospitals...
November 7, 2017: World Journal of Gastroenterology: WJG
https://www.readbyqxmd.com/read/29151407/minerals-and-trace-elements-in-milk-milk-products-infant-formula-and-adult-pediatric-nutritional-formula-icp-ms-method-collaborative-study-aoac-final-action-2015-06-iso-dis-21424-idf-243
#17
Lawrence H Pacquette, Joseph J Thompson
AOAC Final Action Official Method(SM)2015.06 “Minerals and Trace Elements in Milk, Milk Products, Infant Formula and Adult/Pediatric Nutritional Formula, ICP-MS Method” was collaboratively studied. Note that “milk, milk products” has now been added to the title of the Final Action method because whole milk and several dairy ingredients were successfully incorporated into the collaborative study for the purpose of developing an International Organization for Standardization/International Dairy Federation standard (ISO/DIS 21424; in progress)...
November 20, 2017: Journal of AOAC International
https://www.readbyqxmd.com/read/29150761/comparative-study-of-fluvial-lakes-in-floodplains-of-the-elbe-lu%C3%A5-nice-and-svratka-rivers-based-on-hydrochemical-and-biological-approach
#18
Petra Havlíková, Tomáš Chuman, Bohumír Janský
The aim of the thesis was to specify key differences in chemistry and biota (zooplankton communities) among fluvial lakes in three regions of the Czech Republic: the central part of the Elbe River, the upper part of the Lužnice River and the upper part of the Svratka River. The ten studied lakes of the three regions differ in size, geology, shading, connection with the river and the level of anthropogenic impact. The following hypotheses were tested: (1) The water chemistry of fluvial lakes significantly differs in different floodplains...
November 17, 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/29149966/seasonal-variation-of-vitamin-d-status-in-long-term-kidney-transplant-recipients
#19
J Wilimborek, M Nowicki, I Kurnatowska
BACKGROUND: There is little information about circannual rhythm of vitamin D level in kidney transplantation (KTx) patients. MATERIAL AND METHODS: In 71 patients (27 females; 44 males) in the long term after KTx (5.5 ± 2.6 years) during the winter and summer months plasma concentration of 25-hydroxyvitamin D (25(OH)D), 1,25-hydroxyvitamin D, parathormone (PTH), fibroblast growth factor 23 (FGF-23), calcium, and phosphorus were assessed. Vitamin D status was classified according to 25(OH)D level (ie, insufficiency, ≤30 ng/mL; deficiency, <15 ng/mL)...
November 2017: Transplantation Proceedings
https://www.readbyqxmd.com/read/29149674/the-impact-of-operational-strategies-on-the-performance-of-a-photo-ebpr-system
#20
V C F Carvalho, E B Freitas, P J Silva, J C Fradinho, M A M Reis, A Oehmen
A novel Phototrophic - Enhanced Biological Phosphorus Removal (Photo-EBPR) system, consisting of a consortium of photosynthetic organisms and polyphosphate accumulating organisms (PAOs), was studied in this work. A sequencing batch reactor was fed with a mixture of acetate and propionate (75%-25%) and subjected to dark/light cycles in order to select a photo-EBPR system containing PAOs and photosynthetic organisms, the latter likely providers of oxygen to the system. The results from the selection period (stage 1) showed that the photo-EBPR culture was capable of performing P release in the dark and P uptake in the presence of light, under limited oxygen concentrations...
November 4, 2017: Water Research
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