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Phosphoric acid

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https://www.readbyqxmd.com/read/27913083/different-biosorption-mechanisms-of-uranium-vi-by-live-and-heat-killed-saccharomyces-cerevisiae-under-environmentally-relevant-conditions
#1
Tieshan Wang, Xinyan Zheng, Xiaoyu Wang, Xia Lu, Yanghao Shen
Uranium adsorption mechanisms of live and heat-killed Saccharomyces cerevisiae in different pH values and biomass concentrations were studied under environmentally relevant conditions. Compared with live cells, the adsorption capacity of heat-killed cells is almost one order of magnitude higher in low biomass concentration and highly acidic pH conditions. To explore the mesoscopic surface interactions between uranium and cells, the characteristic of uranium deposition was investigated by SEM-EDX, XPS and FTIR...
November 29, 2016: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/27912988/sequential-electrodialytic-recovery-of-phosphorus-from-low-temperature-gasification-ashes-of-chemically-precipitated-sewage-sludge
#2
Raimon Parés Viader, Pernille Erland Jensen, Lisbeth M Ottosen, Jesper Ahrenfeldt, Henrik Hauggaard-Nielsen
Phosphorus recycling from secondary materials like sewage sludge ashes offers an alternative to mining of phosphates from primary resources and a mean to counteract the current phosphorous rock depletion concern. A separation of P from the bulk ash is normally required, due to its low plant availability and the presence of heavy metals. Previously, more than 80% of P was recovered from incineration sewage sludge ashes using a two-compartment electrodialytic cell. In contrast, the recovery was below 30% for ashes from low-temperature gasification using the same setup...
November 29, 2016: Waste Management
https://www.readbyqxmd.com/read/27912186/recycling-oriented-comparison-of-mercury-distribution-in-new-and-spent-fluorescent-lamps-and-their-potential-risk
#3
Julia Hobohm, Oliver Krüger, Srotoswini Basu, Kerstin Kuchta, Sebastian van Wasen, Christian Adam
This study compares the mercury distribution in the vapor phase, the phosphor powder and the glass matrix of new and spent fluorescent lamps. The spent fluorescent lamps were obtained at the collection yards of a public waste management company in Hamburg, Germany. An innovative systematic sampling method is utilized to collect six spent and eight corresponding new, off-the-shelf fluorescent lamp samples. The efficiency of several acid digestion methods for the determination of the elemental composition was studied and elemental mass fractions of K, Na, Y, Ca, Ba, Eu, Al, Pb, Mg, Hg, and P were measured...
November 29, 2016: Chemosphere
https://www.readbyqxmd.com/read/27911415/extraction-of-plant-based-capsules-for-microencapsulation-applications
#4
Michael G Potroz, Raghavendra C Mundargi, Jae Hyeon Park, Ee-Lin Tan, Nam-Joon Cho
Microcapsules derived from plant-based spores or pollen provide a robust platform for a diverse range of microencapsulation applications. Sporopollenin exine capsules (SECs) are obtained when spores or pollen are processed so as to remove the internal sporoplasmic contents. The resulting hollow microcapsules exhibit a high degree of micromeritic uniformity and retain intricate microstructural features related to the particular plant species. Herein, we demonstrate a streamlined process for the production of SECs from Lycopodium clavatum spores and for the loading of hydrophilic compounds into these SECs...
November 9, 2016: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/27907125/identification-of-a-highly-conserved-hypothetical-protein-ton_0340-as-a-probable-manganese-dependent-phosphatase
#5
Young-Sik Sohn, Seong-Gyu Lee, Kwang-Hoon Lee, Bonsu Ku, Ho-Chul Shin, Sun-Shin Cha, Yeon-Gil Kim, Hyun Sook Lee, Sung-Gyun Kang, Byung-Ha Oh
A hypothetical protein TON_0340 of a Thermococcus species is a protein conserved in a variety of organisms including human. Herein, we present four different crystal structures of TON_0340, leading to the identification of an active-site cavity harboring a metal-binding site composed of six invariant aspartate and glutamate residues that coordinate one to three metal ions. Biochemical and mutational analyses involving many phosphorous compounds show that TON_0340 is a Mn2+-dependent phosphatase. Mg2+ binds to TON_0340 less tightly and activates the phosphatase activity less efficiently than Mn2+...
2016: PloS One
https://www.readbyqxmd.com/read/27897998/a-new-two-photon-ratiometric-fluorescent-probe-for-detecting-alkaline-phosphatase-in-living-cells
#6
Xiaohong Zhou, Yuren Jiang, Xiongjie Zhao, Yao Zhu
Alkaline phosphatase (ALP) is an important diagnostic indicator of many human diseases. To quantitatively track ALP in biosystems, herein, for the first time, we report an efficient two-photon ratiometric fluorescent probe, termed probe 1 and based on classic naphthalene derivatives with a donor-π-acceptor (D-π-A) structure and deprotection of the phosphoric acid moiety by ALP. The presence of ALP causes the cleave of the phosphate group from naphthalene derivatives and the phosphate group changes the ability of the intramolecular charge transfer (ICT) and remarkably alters the probe's photophysical properties, thus an obvious ratiometric signal with an isoemissive point is observed...
November 25, 2016: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/27890545/organic-acid-anions-an-effective-defensive-weapon-for-plants-against-aluminum-toxicity-and-phosphorus-deficiency-in-acidic-soils
#7
REVIEW
Zhi Chang Chen, Hong Liao
Aluminum (Al) toxicity and phosphorous (P) deficiency are two major limiting factors for plant growth on acidic soils. Thus, the physiological mechanisms for Al tolerance and P acquisition have been intensively studied. A commonly observed trait is that plants have developed the ability to utilize organic acid anions (OAs; mainly malate, citrate and oxalate) to combat Al toxicity and P deficiency. OAs secreted by roots into the rhizosphere can externally chelate Al(3+) and mobilize phosphate (Pi), while OAs synthesized in the cell can internally sequester Al(3+) into the vacuole and release free Pi for metabolism...
November 11, 2016: Journal of Genetics and Genomics, Yi Chuan Xue Bao
https://www.readbyqxmd.com/read/27889510/amine-functionalized-multi-arm-star-polymers-a-novel-platform-for-removing-glyphosate-from-aqueous-media
#8
Lianna Samuel, Ran Wang, Geraud Dubois, Robert Allen, Rudy Wojtecki, Young-Hye La
We describe a novel method for efficiently removing glyphosate from aqueous media via adsorption onto highly functionalized star-shaped polymeric particles. These particles have a polystyrene core with more than 35 attached methacrylate polymer arms, each containing a plurality of pendant amines (poly(dimethylamino ethyl methacrylate): PDMAEMA) that are partially protonated in water. Kinetic studies demonstrate that these star-polymers successfully remove up to 93% of glyphosate present in aqueous solution (feed concentration: 5 ppm), within 10 min contact time, outperforming activated carbon, which removed 33% after 20 min...
November 24, 2016: Chemosphere
https://www.readbyqxmd.com/read/27882491/influence-of-phosphorous-fertilization-on-copper-phytoextraction-and-antioxidant-defenses-in-castor-bean-ricinus-communis-l
#9
Guoyong Huang, Muhammad Shahid Rizwan, Chao Ren, Guangguang Guo, Qingling Fu, Jun Zhu, Hongqing Hu
Application of fertilizers to supply appropriate nutrients has become an essential agricultural strategy for enhancing the efficiency of phytoremediation in heavy metal contaminated soils. The present study was conducted to investigate the beneficial effects of three types of phosphate fertilizers (i.e., oxalic acid-activated phosphate rock (APR), Ca(H2PO4)2, and NaH2PO4) in the range of 0-600 mg P kg(-1) soil, on castor bean growth, antioxidants [antioxidative enzymes and glutathione (GSH)], and Cu uptake...
November 23, 2016: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/27880011/shear-bond-strength-of-repair-systems-to-new-cad-cam-restorative-materials
#10
Özlem Üstün, Işıl Keçik Büyükhatipoğlu, Aslı Seçilmiş
PURPOSE: To evaluate the bond strength of repair systems (Ceramic Repair, Clearfil Repair) to computer-aided design/computer-assisted machining (CAD/CAM) restorative materials (IPS e.max CAD, Vita Suprinity, Vita Enamic, Lava Ultimate). MATERIALS AND METHODS: Thermally aged CAD/CAM restorative material specimens (5000 cycles between 5°C and 55°C) were randomly divided into two groups according to the repair system: Ceramic Repair (37% phosphoric acid + Monobond-S + Heliobond + Tetric N Ceram) or Clearfil Repair (40% phosphoric acid + mixture of Clearfil Porcelain Bond Activator and Clearfil SE Bond Primer + Clearfil SE Bond + Filtek Z250)...
November 23, 2016: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/27877898/nanoporous-carbon-materials-with-enhanced-supercapacitance-performance-and-non-aromatic-chemical-sensing-with-c1-c2-alcohol-discrimination
#11
Lok Kumar Shrestha, Laxmi Adhikari, Rekha Goswami Shrestha, Mandira Pradhananga Adhikari, Rina Adhikari, Jonathan P Hill, Raja Ram Pradhananga, Katsuhiko Ariga
We have investigated the textural properties, electrochemical supercapacitances and vapor sensing performances of bamboo-derived nanoporous carbon materials (NCM). Bamboo, an abundant natural biomaterial, was chemically activated with phosphoric acid at 400 °C and the effect of impregnation ratio of phosphoric acid on the textural properties and electrochemical performances was systematically investigated. Fourier transform-infrared (FTIR) spectroscopy confirmed the presence of various oxygen-containing surface functional groups (i...
2016: Science and Technology of Advanced Materials
https://www.readbyqxmd.com/read/27875718/an-adsorbent-with-a-high-adsorption-capacity-obtained-from-the-cellulose-sludge-of-industrial-residues
#12
Géssica Orlandi, Jéssica Cavasotto, Francisco R S Machado, Gustavo L Colpani, Jacir Dal Magro, Francieli Dalcanton, Josiane M M Mello, Márcio A Fiori
One of the major problems in effluent treatment plants of the cellulose and paper industry is the large amount of residual sludge generated. Therefore, this industry is trying to develop new methods to treat such residues and to use them as new products, such as adsorbents. In this regard, the objective of this work was to develop an adsorbent using the raw activated sludge generated by the cellulose and paper industry. The activated cellulose sludge, after being dried, was chemically activated with 42.5% (v/v) phosphoric acid at 85 °C for 1 h and was charred at 500 °C, 600 °C and 700 °C for 2 h...
November 19, 2016: Chemosphere
https://www.readbyqxmd.com/read/27874177/the-differentiation-of-menstrual-from-venous-blood-and-other-body-fluids-on-various-substrates-using-atr-ft-ir-spectroscopy
#13
Alicia A Quinn, Kelly M Elkins
Crime scene investigators and laboratory analysts use chemical tests to detect and differentiate body fluids. Testing often requires a sample of the stain, and the chemicals may cause degradation of the fluid or interfere with subsequent tests. Colorimetric chemical tests do not differentiate between different types of the same fluid, such as venous and menstrual blood, and there is no presumptive test available to simultaneously differentiate several body fluids. In this study, we recorded ATR FT-IR spectra of venous and menstrual blood, semen, saliva, and breastmilk...
November 22, 2016: Journal of Forensic Sciences
https://www.readbyqxmd.com/read/27869252/resin-dentin-bond-stability-of-experimental-4-meta-based-etch-and-rinse-adhesives-solvated-by-ethanol-or-acetone
#14
Cristiane Mariote Amaral, Alice Marques Diniz, Eugênio Braz Rodrigues Arantes, Glauco Botelho Dos Santos, Jaime Dutra Noronha-Filho, Eduardo Moreira da Silva
PURPOSE: To investigate the influence of 4-META concentration and type of solvent on the degree of conversion (DC%) and resin-dentin bond stability of experimental etch-and-rinse adhesives. MATERIALS AND METHODS: Four different concentrations of 4-META (12 wt%, 20 wt%, 30 wt%, 40 wt%) were added to a model adhesive system consisting of TEG-DMA (25 wt%), UDMA (20 wt%), HEMA (30 wt%), water (4 wt%), camphorquinone (0.5 wt%), and tertiary amine (0.5 wt%) dissolved in 20% acetone (A12, A20, A30 and A40) or 20% ethanol (E12, E20, E30 and E40)...
November 18, 2016: Journal of Adhesive Dentistry
https://www.readbyqxmd.com/read/27866556/-clinical-analysis-of-5-patients-caused-by-acute-inhalation-of-phosphoric-acid-gas-poisoning
#15
J G Dong, Z W Qiu, H C Wang
No abstract text is available yet for this article.
September 20, 2016: Chinese Journal of Industrial Hygiene and Occupational Diseases
https://www.readbyqxmd.com/read/27863797/stabilization-of-pb-ii-accumulated-in-biomass-through-phosphate-pretreated-pyrolysis-at-low-temperatures
#16
Saijun Li, Tao Zhang, Jianfa Li, Lingna Shi, Xiaoxiao Zhu, Jinhong Lü, Yimin Li
The remediation of heavy metal-contaminated soil and water using plant biomass is considered to be a green technological approach, although the harmless disposal of biomass accumulated with heavy metals remains a challenge. A potential solution to this problem explored in this work involves combining phosphate pretreatment with pyrolysis. Pb(II) was accumulated in celery biomass with superior sorption capacity and also in ordinary wood biomass through biosorption. The Pb(II)-impregnated biomass was then pretreated with phosphoric acid or calcium dihydrogen phosphate (CaP) and pyrolyzed at 350 or 450°C...
November 10, 2016: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/27862771/an-enantioselective-bidentate-auxiliary-directed-palladium-catalyzed-benzylic-c-h-arylation-of-amines-using-a-binol-phosphate-ligand
#17
Hao Wang, Hua-Rong Tong, Gang He, Gong Chen
A new enantioselective palladium(II)-catalyzed benzylic C-H arylation reaction of amines is enabled by the bidentate picolinamide (PA) directing group. This reaction provides the first example of enantioselective benzylic γ-C-H arylations of alkyl amines, and proceeds with up to 97 % ee. The 2,2'-dihydroxy-1,1'-binaphthyl (BINOL) phosphoric acid ligand, Cs2 CO3 , and solvent-free conditions are essential for high enantioselectivity. Mechanistic studies suggest that multiple BINOL ligands are involved in the stereodetermining C-H palladation step...
November 11, 2016: Angewandte Chemie
https://www.readbyqxmd.com/read/27862760/safer-pyrotechnic-obscurants-based-on-phosphorus-v-nitride
#18
Ernst-Christian Koch, Stanisław Cudziło
The potential of phosphorus(V) nitride, P3 N5  , as a replacement for red phosphorus, PR , in pyrotechnic obscurants has been theoretically and experimentally investigated. P3 N5 can be safely mixed with KNO3 and even KClO3 and KClO4  . The corresponding formulations are surprisingly insensitive to friction and only mildly impact-sensitive. P3 N5  /KNO3 pyrolants with ξ=20-80 wt % P3 N5 burn 200 times faster than the corresponding mixtures based on PR and generate a dense smoke. Hence obscurants based on P3 N5  /KNO3 have a figure of merit that by far exceeds that of current state-of-the-art PR -based obscurants...
November 9, 2016: Angewandte Chemie
https://www.readbyqxmd.com/read/27859095/controls-on-carbon-storage-and-weathering-in-volcanic-soils-across-a-high-elevation-climate-gradient-on-mauna-kea-hawaii
#19
Marc G Kramer, Oliver A Chadwick
Volcanic ash soils retain the largest and most persistent soil carbon pools of any ecosystem. However, the mechanisms governing soil carbon accumulation and weathering during initial phases of ecosystem development are not well understood. We examined soil organic matter dynamics and soil development across a high-altitude (3,560-3,030 m) 20-kyr climate gradient on Mauna Kea in Hawaii. Four elevation sites were selected (~250-500 mm rainfall), which range from sparsely vegetated to sites that contain a mix of shrubs and grasses...
September 2016: Ecology
https://www.readbyqxmd.com/read/27855921/determination-of-5-hydroxymethylfurfural-in-honey-using-headspace-solid-phase-microextraction-coupled-with-a-polyoxometalate-coated-piezoelectric-quartz-crystal
#20
Marta I S Veríssimo, José A F Gamelas, Dmitry V Evtuguin, M Teresa S R Gomes
High concentrations of 5-hydroxymethylfurfural (HMF) in honey provide an indication of overheating under inappropriate storage conditions or aging. Conventional methods for determining HMF are cumbersome and require expensive equipment or hazardous reagents. Hence the aim of this study was to propose a new analytical tool for HMF determination in honey, using a low cost acoustic wave sensor. Volatile organic compounds (VOCs) of honey samples were extracted, using the solid phase microextraction (SPME) technique, and HMF was quantified, using a piezoelectric quartz crystal with gold electrodes coated with a layer of decamolybdodivanado phosphoric acid, sensitive to HMF...
April 1, 2017: Food Chemistry
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