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Phosphorus

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https://www.readbyqxmd.com/read/28812888/triply-bonded-gallium%C3%A2-phosphorus-molecules-theoretical-designs-and-characterization
#1
Jia-Syun Lu, Ming-Chung Yang, Ming-Der Su
The effect of substitution on the potential energy surfaces of triple-bonded RGa≡PR (R = F, OH, H, CH3, SiH3, SiMe(SitBu3)2, SiiPrDis2, Tbt (C6H2-2,4,6-{CH(SiMe3)2}3), and Ar* (C6H3-2,6-(C6H2-2,4,6-i-Pr3)2)) compounds was theoretically examined by using the density functional theory (i.e., M06-2X/Def2-TZVP, B3PW91/Def2-TZVP and B3LYP/LANL2DZ+dp). The theoretical evidences strongly suggest all of the triple-bonded RGa≡PR species prefer to select a bent form with an angle (∠Ga-P-R) of about 90°. Moreover, the theoretical observations indicate only the bulkier substituents, in particular for the strong donating groups (e...
August 16, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28811554/a-new-method-to-investigate-the-catalytic-mechanism-of-yhde-pyrophosphatase-by-using-a-pyrophosphate-fluorescence-probe
#2
Qingya Shen, Hongwei Tan, Guo-Wen Xing, Jimin Zheng, Zongchao Jia
YhdE is a Maf (multicopy associated filamentation) proteins from Escherichia coli which exhibits pyrophosphatase activity towards selected nucleotides, although its catalytic mechanism remains unclear. Herein we used a novel fluorescence probe (4-isoACBA-Zn(II) complex) to characterize the enzymatic properties of YhdE and its mutant, establishing a new method for assaying pyrophosphatase catalytic function. Our results reveal for the first time that the new fluorescence sensor confers high sensitivity and specificity and pyrophosphate (PPi) is the direct catalytic product of YhdE...
August 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28811048/receipt-of-nephrology-care-and-clinical-outcomes-among-veterans-with-advanced-ckd
#3
Enrica Fung, Tara I Chang, Glenn M Chertow, I-Chun Thomas, Steven M Asch, Manjula Kurella Tamura
BACKGROUND: Clinical practice guidelines recommend referral to nephrology when estimated glomerular filtration rate (eGFR) decreases to <30mL/min/1.73m(2); however, evidence for benefits of nephrology care are mixed. STUDY DESIGN: Observational cohort using landmark analysis. SETTINGS & PARTICIPANTS: A national cohort of veterans with advanced chronic kidney disease, defined as an outpatient eGFR≤30mL/min/1.73m(2) for January 1, 2010, through December 31, 2010, and a prior eGFR<60mL/min/1...
August 12, 2017: American Journal of Kidney Diseases: the Official Journal of the National Kidney Foundation
https://www.readbyqxmd.com/read/28810770/electronic-structures-at-the-interface-between-cupc-and-black-phosphorus
#4
Can Wang, Dongmei Niu, Haipeng Xie, Baoxing Liu, Shitan Wang, Menglong Zhu, Yongli Gao
The electronic structure at the organic-inorganic semiconductor interface of π-conjugated copper phthalocyanine (CuPc) on a black phosphorus (BP) crystal surface is studied with photoemission spectroscopy and density functional theory calculations. From the photoemission spectra, we observe a shift of about 0.7 eV for the highest occupied molecular orbital, which originates from the transition of phase in the organic molecular thin film (from the interface phase to the bulk phase). On the other hand, we find 0...
August 14, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28810514/multi-objective-spatial-tools-to-inform-maritime-spatial-planning-in-the-adriatic-sea
#5
Daniel Depellegrin, Stefano Menegon, Giulio Farella, Michol Ghezzo, Elena Gissi, Alessandro Sarretta, Chiara Venier, Andrea Barbanti
This research presents a set of multi-objective spatial tools for sea planning and environmental management in the Adriatic Sea Basin. The tools address four objectives: 1) assessment of cumulative impacts from anthropogenic sea uses on environmental components of marine areas; 2) analysis of sea use conflicts; 3) 3-D hydrodynamic modelling of nutrient dispersion (nitrogen and phosphorus) from riverine sources in the Adriatic Sea Basin and 4) marine ecosystem services capacity assessment from seabed habitats based on an ES matrix approach...
August 8, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28810512/co-digestion-of-rice-straw-and-cow-dung-to-supply-cooking-fuel-and-fertilizers-in-rural-india-impact-on-human-health-resource-flows-and-climate-change
#6
Sophie Sfez, Steven De Meester, Jo Dewulf
Anaerobic digestion of cow dung with new feedstock such as crop residues to increase the biogas potential is an option to help overcoming several issues faced by India. Anaerobic digestion provides biogas that can replace biomass cooking fuels and reduce indoor air pollution. It also provides digestate, a fertilizer that can contribute to compensate nutrient shortage on agricultural land. Moreover, it avoids the burning of rice straw in the fields which contributes to air pollution in India and climate change globally...
August 8, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28809621/cardiovascular-risk-factors-and-mortality-in-children-with-chronic-kidney-disease
#7
Abdullahi Mudi, Caroline Dickens, Cecil Levy, Daynia Ballot
BACKGROUND: Cardiovascular disease (CVD) begins early in children with chronic kidney disease (CKD), and its progression is determined by the presence of single or multiple cardiovascular risk factors (CVRFs). OBJECTIVE: To determine the prevalence of CVRFs in children with CKD and their association with mortality in children on chronic dialysis. METHODS: This comparative cross-sectional study recruited children aged 5 - 18 years with all stages of CKD...
July 28, 2017: South African Medical Journal, Suid-Afrikaanse Tydskrif Vir Geneeskunde
https://www.readbyqxmd.com/read/28808879/influence-of-ignited-sediments-on-external-phosphorus-adsorption-and-sedimentary-phosphorus-forms
#8
PeiYing Zhu, DaPeng Li, Yong Huang, Yong Li
Phosphorus (P) adsorpted by sediments, when covered by and mixed with ignited sediments from Meiliang Bay in Tai Lake, was analyzed in the laboratory. Potassium dihydrogen phosphate (KH2PO4) was added to the parallel experimental units to simulate periodic external P input. Based on the Langmuir model, the sediments after ignition had a greater Smax (maximum P adsorption), a lower equilibrium phosphorus concentration at zero adsorption (EPC0), and a lower degree of phosphorus saturation in comparison with sediments without ignition...
August 15, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28808770/associations-between-serum-calcium-phosphorus-and-mortality-among-patients-with-coronary-heart-disease
#9
Qian Chen, Yuan Zhang, Ding Ding, Dan Li, Yunou Yang, Qing Li, Xuechen Chen, Gang Hu, Wenhua Ling
PURPOSE: Serum calcium and phosphorus abnormalities are associated with cardiovascular disorders in general population, but evidence among patients with established coronary heart disease (CHD) is limited and controversial. This study aimed to investigate the associations of baseline serum calcium and phosphorus levels with long-term mortality risk among patients with CHD. METHODS: We conducted a prospective cohort study among 3187 patients with CHD from October 2008 and December 2011 in China...
August 14, 2017: European Journal of Nutrition
https://www.readbyqxmd.com/read/28808553/parasite-and-host-elemental-content-and-parasite-effects-on-host-nutrient-excretion-and-metabolic-rate
#10
Nicole Chodkowski, Randall J Bernot
Ecological stoichiometry uses the mass balance of elements to predict energy and elemental fluxes across different levels of ecological organization. A specific prediction of ecological stoichiometry is the growth rate hypothesis (GRH), which states that organisms with faster growth or reproductive rates will require higher phosphorus content for nucleic acid and protein synthesis. Although parasites are found ubiquitously throughout ecosystems, little is understood about how they affect nutrient imbalances in ecosystems...
August 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28808244/the-n-p-k-soil-nutrient-balance-of-portuguese-cropland-in-the-1950s-the-transition-from-organic-to-chemical-fertilization
#11
Miguel Carmo, Roberto García-Ruiz, Maria Isabel Ferreira, Tiago Domingos
Agricultural nutrient balances have been receiving increasing attention in both historical and nutrient management research. The main objectives of this study were to further develop balance methodologies and to carry out a comprehensive assessment of the functioning and nutrient cycling of 1950s agroecosystems in Portugal. Additionally, the main implications for the history of agriculture in Portugal were discussed from the standpoint of soil fertility. We used a mass balance approach that comprises virtually all nitrogen (N), phosphorus (P) and potassium (K) inputs and outputs from cropland topsoil for average conditions in the period 1951-56...
August 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28806650/floating-rice-culture-system-for-nutrient-remediation-and-feed-production-in-a-eutrophic-lake
#12
Ankita Srivastava, Seong-Jun Chun, So-Ra Ko, Junhwan Kim, Chi-Yong Ahn, Hee-Mock Oh
The increased inputs of nutrients have been demonstrated to be a major contributing factor to the eutrophication of lakes and reservoirs which can lead to the production of harmful algal/cyanobacterial blooms and deleteriously affect the aesthetics of water-bodies. Floating plant-culture systems have been widely used for the ecological remediation of eutrophic water in a cost-effective manner. We investigated the applicability of Korean japonica rice variety 'Nampyeong' in a floating-culture system in a eutrophic lake for nutrient uptake and biomass production...
August 11, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28805912/prediction-of-fecal-nitrogen-and-phosphorus-excretion-for-chinese-holstein-lactating-dairy-cows
#13
Q B Qu, P Yang, R Zhao, S L Zhi, Z W Zhai, F F Ding, K Q Zhang
Mathematical models for predicting nitrogen and phosphorus excretion play a key role in manure application and environment monitoring. An analysis for prediction of fecal nitrogen (FN, g/d) and fecal phosphorus (FP, g/d) excretion for Chinese Holstein lactating dairy cows was conducted using a data set from 15 dairy farms in northern China. The whole independent-variable data set, obtained with questionnaires, consisted of 110 sets of average diet nutrient compositions, including DMI (kg/d), CP content (% DM), OM intake (OMI, kg/d), nitrogen intake (NI, g/d), and phosphorus intake (PI, g/d), and animal characteristics, including average days in milk (DIM, d), average milk yield (MY, kg/d), and average BW (kg)...
August 2017: Journal of Animal Science
https://www.readbyqxmd.com/read/28804810/assessing-the-phytoavailability-of-arsenic-and-phosphorus-to-corn-plant-after-the-addition-of-an-acrylic-copolymer-to-polluted-soils
#14
Tahereh Mansouri, Ahmad Golchin, Hossein Kouhestani
Soil pollution by arsenic increases the potential risk of arsenic entrance into the food chain. The usefulness of maleic anhydride- styrene- acrylic acid copolymer on the mobility and phytoavailability of arsenic was evaluated. Treatments were the concentrations of acrylic copolymer (0, 0.05, 0.10, and 0.20% w/w) and the concentrations of soil total arsenic (0, 6, 12, 24, 48, and 96 mg kg(-1)). Sodium arsenate was added in appropriate amounts to subsamples of an uncontaminated soil to give contaminated soils with different levels of arsenic...
August 13, 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/28804808/enhanced-phosphorus-removal-in-intermittently-aerated-constructed-wetlands-filled-with-various-construction-wastes
#15
Xia Shi, Jinlin Fan, Jian Zhang, Youhao Shen
Phosphorus (P) loss by various pathways in constructed wetlands (CWs) is often variable. The effects of intermittent aeration and different construction waste substrates (gravel, red brick, fly-ash brick) on P processing using six batch-operated vertical flow constructed wetlands (VFCWs) were studied for decentralized domestic wastewater treatment. Average removal of total phosphorus (TP) in three aerated CWs was markedly higher (21.06, 24.83, and 27.02 mg m(-2) day(-1), respectively) than non-aerated CWs (10...
August 13, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28803343/sediment-lipid-biomarkers-record-phytoplankton-dynamics-of-lake-heihai-yunnan-province-sw-china-driven-by-climate-warming-since-the-1980s
#16
Yongdong Zhang, Yaling Su, Zhengwen Liu, Jinlei Yu, Miao Jin
Increased phosphorus (P) export from sediments to the overlying water column is a significant factor driving the variation of phytoplankton in productivity and community structure in lakes. However, the lack of long-term instrumental data often impeded analyses attempting to associate dynamics of phytoplankton with variation of internal P loading. Here, elements and lipid biomarkers were analyzed in a sediment core from Lake Heihai, a small, deep, and ultraoligotrophic alpine lake in Haba Mountain, Yunnan Province, SW China...
August 12, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28803188/remediation-of-internal-phosphorus-loads-with-modified-clays-influence-of-fluvial-suspended-particulate-matter-and-response-of-the-benthic-macroinvertebrate-community
#17
Hongbin Yin, Grant B Douglas, Yongjiu Cai, Cheng Liu, Diego Copetti
Clay-based phosphorus (P) sorbents have been increasingly used as geoengineering materials for the management sediment-derived internal P loading in eutrophic lakes. However, the long-term behavior of these sorbents has remained elusive along with their response to burial under suspended particulate matter (SPM), and their effect on macroinvertebrate communities occupying dynamic regions at the sediment-water interface of shallow and turbid lakes. In this study, field mesocosm experiments were undertaken in Lake Chaohu, China, to study the effects of the application of lanthanum-modified bentonite (LMB) and thermally-modified calcium-rich attapulgite (TCAP) on sediment internal P loading and to assess their influence on macroinvertebrate community structure...
August 10, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28803153/comparison-of-sediment-and-nutrient-export-and-runoff-characteristics-from-watersheds-with-centralized-versus-distributed-stormwater-management
#18
Kristina G Hopkins, J V Loperfido, Laura S Craig, Gregory B Noe, Dianna M Hogan
Stormwater control measures (SCMs) are used to retain stormwater and pollutants. SCMs have traditionally been installed in a centralized manner using detention to mitigate peak flows. Recently, distributed SCM networks that treat runoff near the source have been increasingly utilized. The aim of this study was to evaluate differences among watersheds that vary in SCM arrangement by assessing differences in baseflow nutrient (NOx-N and PO4(-)) concentrations and fluxes, stormflow export of suspended sediments and particulate phosphorus (PP), and runoff characteristics...
August 9, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28803062/purification-and-reuse-of-non-point-source-wastewater-via-myriophyllum-based-integrative-biotechnology-a-review
#19
REVIEW
Feng Liu, Shunan Zhang, Pei Luo, Xuliang Zhuang, Xiang Chen, Jinshui Wu
In this review, the applications of Myriophyllum-based integrative biotechnology to remove common non-point source (NPS) pollutants, such as nitrogen, phosphorus, heavy metals, and organic pollutants (e.g., pesticides and antibiotics) are summarized. The removal of these pollutants via various mechanisms, including uptake by plant and microbial communities in macrophyte-based treatment systems are discussed. This review highlights the potential use of Myriophyllum biomass to produce animal feed, fertilizer, and other valuable by-products, which can yield cost-effective returns and attract more attention to the regulation and recycling of NPS pollutants...
August 3, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28802659/hypoxia-off-the-changjiang-yangtze-river-estuary-and-in-the-adjacent-east-china-sea-quantitative-approaches-to-estimating-the-tidal-impact-and-nutrient-regeneration
#20
Zhuo-Yi Zhu, Hui Wu, Su-Mei Liu, Ying Wu, Da-Ji Huang, Jing Zhang, Guo-Sen Zhang
Large areas of hypoxia have been reported off The Changjiang Estuary and in the East China Sea. Five cruises, covering winter, spring, and summer, were carried out from 2007 to 2013 in this region, and in August 2013 (summer), an extensive hypoxic event (11,150km(2)) was observed, which was characterized by an estimated bulk oxygen depletion of 5.1 million tons. A strong tidal impact was observed associated with the bottom oxygen depletion, with the periodicity of diel variations in dissolved oxygen being 12h (i...
August 9, 2017: Marine Pollution Bulletin
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