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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 283 for “"NH4⁺"”.
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Nuosėdų formavimosi sistemose CuSO4 – K4P2O7 – H2O ir CuSO4 – (NH4)4P2O7 – H2O mechanizmo tyrimas /
… heterogeneous reaction proceeds in the CuSO4 – (NH4)4P2O7 – H2O system. Formation of the precipitates in the CuSO4 – K4P2O7 – H2O and CuSO4 – (NH4)4P2O7 – H2O systems proceed in the same order: semiamorphous voluminous precipitates → Cu2P2O7.5H2O → Cu3Kat2(P2O7)2.3H2O (Dimorph A) → …
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Phycoremediation of NH4+ and PO43- from meat processing wastewater by using microalgae botryococcus sp.
… meat processing industry has high content of NH4+ and PO43-. Hence, this study is carried out to determine the effectiveness of microalgae Botryococcus sp. to remove nutrients NH4+ and PO43- from wastewater from meat food processing industry and establishes the characteristic of this …
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Anodic Stripping Voltammetry of Tellurium (IV) in 1.0M NH4, SCN at Rotating Disk Gallium - Thin-Film Electrode.
… using a gallium-thin film electrode in 1.0M NH4SCN at 60°C has been applied to study the electroanalytical chemistry of Te(IV). Both externally plated and in-situ plated thin-film gallium on rotating glassy carbon disk electrodes are presented. Detection limits of Te(IV) on various monolayer …
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Respuestas ecofisiológicas al enriquecimiento de amonio en angiospermas marinas
… direct toxic effect caused by high ammonium (NH4+) concentrations on seagrasses has received little attention, in spite of some pioneer works. Adverse effects of NH4+ enrichment have been traditionally explained by internal accumulation of NH4+. To prevent toxic effects, plants must assimilate …
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Die Regulation des Na+2Cl-K+-Cotransporters in der basolateralen Membran der Rattenkolonkrypte
… untersucht. <br>Dazu wurde die NH3/NH4+-Puls Technik zusammen mit der BCECF-Fluoreszenzmessung verwendet. Dabei stellt die langsame Azidifizierung des Zytosols in der zweiten Phase des NH3/NH4+-Pulses ein Maß für den NH4+-Einstrom in die Zelle dar. <br>Vorexperimente ergaben, daß …
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Nitrification suppression and spinach growth in alkaline soil
A single at-planting application of (NH4)2SO4 with and without nitrapyrin, [2-chloro-6-(trichloromethyl) pyridine], was evaluated on spinach in alkaline soil in 2 field experiments and 1 greenhouse experiment. Parameters measured were soil NH4 -N and NO3 -N, spinach yield, leaf color and leaf P, Fe …
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Causes of temporal variations in N species transformations and mobility under acid grassland in York: The multi-functional role of plant litter
… analysis revealed considerable and sustained NH4+-N and NO3--N concentrations from 3 freely draining soil profiles. One profile apparently had litter incorporated into sub-soils and behaved differently compared to the other two with more surficial litter presence. This led to design of a …
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Nitrogen deposition and nitrification in coniferous forests’
… been developed. In particular, N in the form of NH4, in excess to plant and microbial demands could lead to soil acidification if nitrified in the soil and leached, causing loss of base cations or mobilisation of phytotoxic aluminium. Nutrient imbalances due to high soil solution NH4/cation …
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Factors Influencing the Production of Methane during the Anaerobic Digestion of Poultry Wastes
… to ammonia inhibition which reached 4274 mgl of NH4 + - N.<br/><br/>The effects of raised concentrations of NH4 + - N on manure batch digesters seeded with sludge adapted to different levels of NH4 - N was investigated by shock loading NH4C1 or NH4 HCO3. High adapted seed was more tolerant of …
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Characterization of ammoniumtransporters in Arabidopsis thaliana
… diurnal changes in growth rates. In most soils, NH4+ and NO3 – are the predominant sources of inorganic nitrogen that are available for plant nutrition. In this context, plants have evolved mechanisms that enable them to optimize nitrogen acquisition, which include transporters specialized in the …
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Crescimento e desenvolvimento de crisântemo em resposta a relações nitrato/amônio
… estudar os efeitos das diferentes relações NO3- /NH4+ sobre o crescimento, desenvolvimento e composição mineral de folhas de crisântemo. Utilizaram-se vasos com capacidade de 0,9dm3, preenchidos com 0,75dm3 do substrato, (solo: areia: casca de café: esterco), na proporção volumétrica de 2:0,5:1:1. …
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A COMPARATIVE STUDY ON THE ENVIRONMENTAL AMMONIA TOLERANCE OF TWO MUDSKIPPERS
… schlosseri had a much higher tolerance to NH4Cl than Boleophthalmus boddaerti. The 24 h, 48 hand 96 h median lethal concentrations (LC50 ) of NH4Cl for P. schlosseri were 140 mM, 125 mM and 115 mM, respectively, whereas those for B. boddaerti were 17.5 mM, 14 mM and 13.8 mM, respectively. …
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Effect of depth and plants on pollutant removal in horizontal subsurface flow constructed wetlands and their application in Ethiopia
… als die in Bodenfiltern mit 25 cm Tiefe. Für NH4+-N zeigten sich hier keine Unterschiede. Die volumenbezogenen Eliminierungsraten der Bodenfilter H25p und H50p für TN und NH4+-N waren durch signifikante Unterschiede gekennzeichnet. Hingegen wurden die BSB5, TOC, TN, NH4+-N und E. coli nicht …
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Synthesis and characterisation of lanthanide and other inorganic framework materials
… defines channels containing the caesium ions. [(NH4)5(H2O)2][CeIV4(AsO4)6(H2O)F3] (II), has an open framework structure with large channels filled with NH4+ cations and H2O molecules. CeIV[AsO4]F (III) and CeIV[AsO4]F[H2O] (IV) exhibit two types of bridging (Ce–O–Ce and Ce–F–Ce) bonds between …
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Elucidation of nitrate reduction mechanisms on a Pd/In bimetallic catalyst using isotope labeled nitrogen species
… dinitrogen (N2) over toxic ammonia species (NH4+, NH3). A key to improving N2 versus NH4+ production is to elucidate nitrate reduction pathways and identify the key intermediate(s) that determine selectivity. To address this challenge, aqueous reduction experiments with an Al2O3-supported …
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Influence of surface chemistry of carbon materials on inorganic nitrogen contaminants chemisorption
… nitrogen contaminants (INC), namely ammonium (NH4 +), nitrate (NO3-), and nitrite (NO2-), using carbon materials (CMs) such as activated carbon (AC), and biochar (BC) has been widely implemented. This study was based on the hypothesis that surface chemical properties of CMs significantly …
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The effect of post-harvest ammonium sulphate application, planting time and sucker size on plant growth and yield of queen pineapple, ananas comosus
… of subsequent plantings. Post-harvest (NH4)2SO4 application had a significant influence on the percentage increase in sucker fresh mass and length when interacting with the duration of sucker growth on the mother plant. Growing suckers on the mother plant for up to 8 months, after the …
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The impact of metals and other stress factors on microbial ammonia oxidation physiology and isotope effects
… the relative availability of ammonium (NH4+) and NH3. Also, photoinhibition of AOO is widely reported. The mechanism is unknown, although links to reactive oxygen species (ROS) cycling seem likely. We present detailed investigations of three environmentally relevant AOO stress factors: …
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Adsorbents as mitigators in the Transport System of Nitrogen in Soil
… in previous research work. Excess ammonium NH4+treatment and neutralization of various hotspots such as agriculture and industrial areas are vital for improving groundwater quality and reducing atmospheric pollution. It has been discovered that affordable adsorbents were found to be …
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A computer simulation model for investigating the effect of land application of sludge on runoff water quality
… Prior to a runoff event, soil ammnonium-N (NH4 â N) is partitioned between adsorbed and desorbed phases. CREAMS-NT predicts the transport of organic-N, NH4 â N, and sediment=bound phosphorus (P3b) in runoff using enrichment ratios. The transport of soluble nutrients, nitrate-N (NO3 â N), NH4 …
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