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Phosphorus

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https://www.readbyqxmd.com/read/27936500/sodium-co-limits-and-catalyzes-macronutrients-in-a-prairie-food-web
#1
Michael Kaspari, Karl A Roeder, Brittany Benson, Michael D Weiser, Nathan Sanders
Nitrogen and phosphorus frequently limit terrestrial plant production, but have a mixed record in regulating the abundance of terrestrial invertebrates. We contrasted four ways that Na could interact with an NP fertilizer to shape the plants and invertebrates of an inland prairie. We applied NP and Na to m(2) plots in a factorial design. Aboveground invertebrate abundance was independently co-limited by NaCl and NP, but with +NP plots supporting more individuals. We suggest the disparity arises because NP enhanced plant height by 35% (1SD) over controls, providing both food and habitat while NaCl provides only food...
December 9, 2016: Ecology
https://www.readbyqxmd.com/read/27936127/interactions-between-thermal-acclimation-growth-rate-and-phylogeny-influence-prochlorococcus-elemental-stoichiometry
#2
Adam C Martiny, Lanying Ma, Céline Mouginot, Jeremy W Chandler, Erik R Zinser
Variability in plankton elemental requirements can be important for global ocean biogeochemistry but we currently have a limited understanding of how ocean temperature influences the plankton C/N/P ratio. Multiple studies have put forward a 'translation-compensation' hypothesis to describe the positive relationship between temperature and plankton N/P or C/P as cells should have lower demand for P-rich ribosomes and associated depressed QP when growing at higher temperature. However, temperature affects many cellular processes beyond translation with unknown outcomes on cellular elemental composition...
2016: PloS One
https://www.readbyqxmd.com/read/27935525/association-of-dietary-protein-and-dairy-intakes-and-change-in-renal-function-results-from-the-population-based-longitudinal-doetinchem-cohort-study
#3
Gerrie-Cor M Herber-Gast, Sander Biesbroek, Wm Monique Verschuren, Coen DA Stehouwer, Ron T Gansevoort, Stephan Jl Bakker, Annemieke Mw Spijkerman
BACKGROUND: Evidence has suggested that protein from dairy may be less detrimental to renal health than protein from nondairy products. However, to our knowledge, no previous studies have used cystatin C-based measures of the estimated glomerular filtration rate (eGFR). OBJECTIVE: We investigated the associations of sources of protein and dairy with the change in the eGFR in persons with a normal or mildly decreased eGFR. DESIGN: We included 3798 participants, aged 26-65 y, from the Doetinchem Cohort study who were examined ≥3 times 5 y apart...
December 2016: American Journal of Clinical Nutrition
https://www.readbyqxmd.com/read/27934931/the-impact-of-environmental-parameters-on-microcystin-production-in-dialysis-bag-experiments
#4
Liqiang Xie, Richard R Rediske, Nadia D Gillett, James P O'Keefe, Brian Scull, Qingju Xue
It is important to understand what environmental parameters may regulate microcystin (MC) production and congener type. To determine if environmental conditions in two hydraulically connected lakes can influence MC production and congener ratios, we incubated dialysis bags containing phytoplankton from mesotrophic/eutrophic Muskegon Lake into hypereutrophic Bear Lake (Michigan, USA) and vice versa. Strong cyanobacteria growth was observed in all dialysis bags with Bear Lake phytoplankton in July and August...
December 9, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27934779/formation-of-p-type-zno-thin-film-through-co-implantation
#5
Yao-Teng Chuang, Jhe-Wei Liou, Wei-Yen Woon
We present a study on the formation of p-type ZnO thin film through ion implantation. Group V dopants (N, P) with different ionic radii are implanted into chemical vapor deposition grown ZnO thin film on GaN/sapphire substrates prior to thermal activation. It is found that mono-doped ZnO by N(+) implantation results in n-type conductivity under thermal activation. Dual-doped ZnO film with a N:P ion implantation dose ratio of 4:1 is found to be p-type under certain thermal activation conditions. Higher p-type activation levels (10(19) cm(-3)) under a wider thermal activation range are found for the N/P dual-doped ZnO film co-implanted by additional oxygen ions...
December 9, 2016: Nanotechnology
https://www.readbyqxmd.com/read/27934415/effect-of-perylene-photosensitizer-attachment-to-pd-triphosphine-l-2-on-co2-electrocatalysis
#6
Rita E Cook, Brian T Phelan, Leah E Shoer, Marek B Majewski, Michael R Wasielewski
Two new covalently linked chromophore-CO2 reduction catalyst systems were prepared using a perylene chromophore and a bis[(dicyclohexylphosphino)ethyl]phenylphosphinopalladium(II) catalyst. The primary goal of this study is to probe the influence of photosensitizer attachment on the electrocatalytic performance. The position either para or meta to the phosphorus on the phenyl group of the palladium complex was linked via a 2,5-xylyl group to the 3 position of perylene. The electrocatalytic CO2 reduction activity of the palladium complex is maintained in the meta-linked system, but is lost in the para-linked system, possibly because of unfavorable interactions of the perylene chromophore with the glassy carbon electrode used...
December 5, 2016: Inorganic Chemistry
https://www.readbyqxmd.com/read/27934334/effect-of-the-number-of-methyl-groups-on-the-cation-affinity-of-oxygen-nitrogen-and-phosphorus-sites-of-lewis-bases
#7
Younes Valadbeigi, Jean-François Gal
The effect of number of CH3 groups (n) on the cation (H(+), Li(+), Na(+), Al(+), CH3(+)) affinity, polarizability, and dipole moment of 14 simple molecules was investigated. Linear correlations were observed between the polarizabilities and the number of methyl groups. The variations of the cation affinities and dipole moments with the number of methyl groups (n) were not linear, and a quadratic function was proposed for obtaining a good fit of the experimental data. Also, because the proton affinities (PA), lithium cation affinities (LCA), sodium cation affinities (SCA), aluminum cation affinity (AlCA), and methyl cation affinity (MCA) varied quadratically with polarizabilities (α), a formula of the form [cation affinities] = a + bα + cα(2) was proposed...
November 17, 2016: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/27934310/cyclic-trinuclear-gold-i-clusters-with-n-n-and-unusual-c-c-mixed-ligand-bridges
#8
Doris Y Melgarejo, Gina M Chiarella, John P Fackler
Three crystalline trinuclear gold(I) clusters, [Au3f2y] (1), [Au3fy2] (2), and [Au3y3] (3), where f = N,N'-bis(2,6-dimethylphenyl)methanimidamidate and y = dimethylendiphenylphosphinate, exhibit bridges from the N,N-formamidinate and/or from the ylide anion ligand whose P-methylene groups chelate in an unusual fashion, where the chelate CPC unit is perpendicular to the trigonal plane of the metal atoms. Assemblies 1 and 2 are the first gold(I) trinuclear clusters featuring mixed-ligand bridges from different N,N and C,C donors; 3 is a previously unknown homoleptic ylide anion cyclic trinuclear assembly...
November 21, 2016: Inorganic Chemistry
https://www.readbyqxmd.com/read/27934285/in-situ-nanoscale-imaging-of-struvite-formation-during-the-dissolution-of-natural-brucite-implications-for-phosphorus-recovery-from-wastewaters
#9
Jörn Hövelmann, Christine V Putnis
As phosphorus (P) resources are diminishing, the recovery of this essential nutrient from wastewaters becomes an increasingly interesting option. P-recovery through the controlled crystallization of struvite (MgNH4PO4·6H2O), a potential slow-release fertilizer, is highly attractive, but costly if large amounts of Mg have to be added. In this context, natural Mg-minerals like brucite (Mg(OH)2) could provide more cost-effective Mg-sources compared to high-grade Mg-compounds such as MgCl2. Here we used in situ atomic force microscopy (AFM) to study the interactions of ammonium phosphate solutions with brucite (001) cleavage surfaces...
December 6, 2016: Environmental Science & Technology
https://www.readbyqxmd.com/read/27934277/visible-light-responsive-graphitic-carbon-nitride-rational-design-and-photocatalytic-applications-for-water-treatment
#10
Qinmin Zheng, David P Durkin, Justin E Elenewski, Yingxue Sun, Nathan A Banek, Likun Hua, Hanning Chen, Michael J Wagner, Wen Zhang, Danmeng Shuai
Graphitic carbon nitride (g-C3N4) has recently emerged as a promising visible-light-responsive polymeric photocatalyst; however, a molecular-level understanding of material properties and its application for water purification were underexplored. In this study, we rationally designed nonmetal doped, supramolecule-based g-C3N4 with improved surface area and charge separation. Density functional theory (DFT) simulations indicated that carbon-doped g-C3N4 showed a thermodynamically stable structure, promoted charge separation, and had suitable energy levels of conduction and valence bands for photocatalytic oxidation compared to phosphorus-doped g-C3N4...
December 6, 2016: Environmental Science & Technology
https://www.readbyqxmd.com/read/27933086/genotypic-differences-in-phosphorus-efficiency-and-the-performance-of-physiological-characteristics-in-response-to-low-phosphorus-stress-of-soybean-in-southwest-of-china
#11
Tao Zhou, Yongli Du, Shoaib Ahmed, Ting Liu, Menglu Ren, Weiguo Liu, Wenyu Yang
Southwest of China is one of the major soybean (Glycine max L.) production regions in China with low availability of soil phosphorus (P). Whereas little information is available on P-efficient soybean genotypes in this region, even though using P-efficient soybean genotypes is a sustainable P management strategy for enhancing yield and P use efficiency. To assess the genetic variation on P use efficiency, 274 soybean genotypes were employed to compare the yields and P acquisition potentials in the field. Additionally, 10 representational genotypes (5 P-efficient genotypes and 5 P-inefficient genotypes) were grown in hydroponic media containing low P treatment (0...
2016: Frontiers in Plant Science
https://www.readbyqxmd.com/read/27932106/assessment-of-kidney-graft-function-evolution-measured-by-creatinine-and-cystatin-c
#12
M A Ramos-Barron, I Hernandez Bejarano, E Rodrigo, E Cruz Iglesias, A Benito Hernandez, C Agueros Blanco, A I Morales Martin, M Prieto Vicente, F Lopez Hernandez, M Arias, C Gomez-Alamillo
INTRODUCTION: The 2013 Kidney Disease Outcomes Quality Initiative Clinical Practice Guideline suggests measuring cystatin C (sCys) in adults with glomerular filtration rate (GFR) based on creatinine (sCr) between 45 and 59 mL/min/1.73 m(2) if confirmation of chronic kidney disease (CKD) is required. There is not enough evidence to recommend the use of sCys or sCr to estimate GFR in kidney transplant recipients. OBJECTIVES: Our aims were to describe the evolution of sCr, sCys, and GFR in a group of kidney transplant patients and to determine their association with some markers of morbidity at 1 year...
November 2016: Transplantation Proceedings
https://www.readbyqxmd.com/read/27931390/thermal-effects
#13
Ming Yan, Panyue Zhang, Guangming Zeng
This review focuses on the research literatures published in 2015 relating to topics of thermal effects in water pollution control. This review is divided into the following sections: biological nitrogen and phosphorus removal, wastewater treatment for organic conversion, industrial wastewater treatment, anaerobic digestion of sewage sludge and solid waste, sludge biochar preparation and application, pyrolysis of sewage sludge, reduction heavy metal in sewage sludge and soil, and other issues of wastewater and sludge treatment...
October 2016: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/27930876/pioglitazone-on-improves-whole-body-aerobic-capacity-and-skeletal-muscle-energy-metabolism-in-patients-with-metabolic-syndrome
#14
Takashi Yokota, Shintaro Kinugawa, Kagami Hirabayashi, Tadashi Suga, Shingo Takada, Masashi Omokawa, Tomoyasu Kadoguchi, Masashige Takahashi, Arata Fukushima, Shouji Matsushima, Mayumi Yamato, Koichi Okita, Hiroyuki Tsutsui
AIMS/INTRODUCTION: Low aerobic capacity is a strong and independent predictor of all-cause mortality in patients with metabolic syndrome (MetS). Here, we investigated the effects of pioglitazone treatment on whole-body aerobic capacity and skeletal muscle energy metabolism in MetS patients. MATERIALS AND METHODS: Fourteen male patients with MetS received oral 15 mg/day pioglitazone for 4 months. To assess whole-body aerobic capacity, exercise testing with a bicycle ergometer was performed before and after pioglitazone treatment...
December 8, 2016: Journal of Diabetes Investigation
https://www.readbyqxmd.com/read/27930862/a-novel-mild-phase-transition-to-prepare-black-phosphorus-nanosheets-with-excellent-energy-applications
#15
Gang Zhao, Tailin Wang, Yongliang Shao, Yongzhong Wu, Baibiao Huang, Xiaopeng Hao
Based on the phase transformation of phosphorus and Gibbs free energy theory, a new mild method to fabricate black phosphorus nanosheets from their red phosphorus microsphere counterparts is proposed. Interestingly, the as-prepared black phosphorus nanosheets, as a kind of novel metal-free photocatalyst, exhibit excellent photocatalytic H2 production performance owing to their intrinsic layered polycrystalline structure. Besides, the nanosheet is also a kind of potential anode material in lithium-ion batteries and shows good electrochemical performance...
December 8, 2016: Small
https://www.readbyqxmd.com/read/27930831/nutrient-limitation-in-tropical-secondary-forests-following-different-management-practices
#16
R Chelsea Nagy, Edward B Rastetter, Christopher Neill, Stephen Porder
Secondary forests now make up more than half of all tropical forests, and constraints on their biomass accumulation will influence the strength of the terrestrial carbon (C) sink in the coming decades. However the variance in secondary tropical forest biomass for a given stand age and climate is high and our understanding of why is limited. We constructed a model of terrestrial C, nitrogen (N), and phosphorus (P) cycling to examine the influence of disturbance and management practices on nutrient limitation and biomass recovery in secondary tropical forests...
December 8, 2016: Ecological Applications: a Publication of the Ecological Society of America
https://www.readbyqxmd.com/read/27930684/comparison-of-contaminant-transport-in-agricultural-drainage-water-and-urban-stormwater-runoff
#17
Ehsan Ghane, Andry Z Ranaivoson, Gary W Feyereisen, Carl J Rosen, John F Moncrief
Transport of nitrogen and phosphorus from agricultural and urban landscapes to surface water bodies can cause adverse environmental impacts. The main objective of this long-term study was to quantify and compare contaminant transport in agricultural drainage water and urban stormwater runoff. We measured flow rate and contaminant concentration in stormwater runoff from Willmar, Minnesota, USA, and in drainage water from subsurface-drained fields with surface inlets, namely, Unfertilized and Fertilized Fields...
2016: PloS One
https://www.readbyqxmd.com/read/27930682/ecoalim-a-dataset-of-environmental-impacts-of-feed-ingredients-used-in-french-animal-production
#18
Aurélie Wilfart, Sandrine Espagnol, Sylvie Dauguet, Aurélie Tailleur, Armelle Gac, Florence Garcia-Launay
Feeds contribute highly to environmental impacts of livestock products. Therefore, formulating low-impact feeds requires data on environmental impacts of feed ingredients with consistent perimeters and methodology for life cycle assessment (LCA). We created the ECOALIM dataset of life cycle inventories (LCIs) and associated impacts of feed ingredients used in animal production in France. It provides several perimeters for LCIs (field gate, storage agency gate, plant gate and harbour gate) with homogeneously collected data from French R&D institutes covering the 2005-2012 period...
2016: PloS One
https://www.readbyqxmd.com/read/27930294/understanding-the-nature-of-atmospheric-acid-processing-of-mineral-dusts-in-supplying-bioavailable-phosphorus-to-the-oceans
#19
Anthony Stockdale, Michael D Krom, Robert J G Mortimer, Liane G Benning, Kenneth S Carslaw, Ross J Herbert, Zongbo Shi, Stelios Myriokefalitakis, Maria Kanakidou, Athanasios Nenes
Acidification of airborne dust particles can dramatically increase the amount of bioavailable phosphorus (P) deposited on the surface ocean. Experiments were conducted to simulate atmospheric processes and determine the dissolution behavior of P compounds in dust and dust precursor soils. Acid dissolution occurs rapidly (seconds to minutes) and is controlled by the amount of H(+) ions present. For H(+) < 10(-4) mol/g of dust, 1-10% of the total P is dissolved, largely as a result of dissolution of surface-bound forms...
December 7, 2016: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/27929669/fgf23-is-not-required-to-regulate-fetal-phosphorus-metabolism-but-exerts-effects-within-12-hours-after-birth
#20
Yue Ma, Beth J Kirby, Nicholas A Fairbridge, Andrew C Karaplis, Beate Lanske, Christopher S Kovacs
Loss of fibroblast growth factor 23 (FGF23) causes hyperphosphatemia, extraskeletal calcifications, and early mortality; excess FGF23 causes hypophosphatemia with rickets or osteomalacia. However, FGF23 may not be important during fetal development. FGF23 deficiency (Fgf23 null) and FGF23 excess (Phex null) did not alter fetal phosphorus or skeletal parameters. In this study we further tested our hypothesis that FGF23 is not essential for fetal phosphorus regulation but becomes important after birth. Although co-receptor Klotho null adults have extremely high FGF23 concentrations, intact FGF23 was normal in Klotho null fetuses, as were fetal phosphorus and skeletal parameters, and placental and renal expression of FGF23 target genes...
December 8, 2016: Endocrinology
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