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| Lima, Francisco Roberto dos Santos; Cavalcante, Davi de Holanda; Rebouças, Vanessa Tomaz; Sá, Marcelo Vinícius do Carmo e. |
| The present study aimed at determining the effects of the interaction between afternoon aeration and stocking density of Nile tilapia on variables of water and soil quality, growth performance and effluent quality. The experiment was a 3 x 2 factorial randomized block design, with three stocking densities (8, 12 and 16 fish per tank or 43.5, 65.3, and 87.0 g m-3) under two mechanical aeration regimes, absence (control; three replicates) and afternoon aeration (four replicates). The afternoon aeration was carried out from 12.00 a.m. up to 18.00 p.m. from the 3rd week until the end of the experiment. Except for the 16-fish tanks, the lowest concentrations of total ammonia nitrogen were found in the tanks with higher density of fish provided with afternoon... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Piscicultura; Tilápia fish farming; Total ammonia nitrogen; Unionized ammonia; Nitrite. |
| Ano: 2016 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/27093 |
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| Brandão,Andrea D.; Sodek,Ladaslav. |
| Nitrate is reported to improve tolerance of plants towards oxygen deficiency enabled by waterlogging of the root system, but the mechanism underlying the phenomenon remains poorly understood. We studied the metabolism of nitrate in roots exposed to hypoxia, using soybean plants growing in a hydroponic system after suspending aeration and covering the surface of the nutrient solution with mineral oil. Nitrate depletion from the medium was more intense under hypoxia than normoxia, but in the presence of chloramphenicol, consumption under hypoxia was significantly reduced. Nitrite accumulated in the medium in the state of hypoxia and this effect was partially eliminated by chloramphenicol. Nitrate consumption sensitive to chloramphenicol was attributed to... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Glycine max; Hypoxia; Nitrate reductase; Nitrite; Waterlogging. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202009000100003 |
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| CUNHA, N. G. da; POTT, A.; GONCALVES, A. R.. |
| As "cordilheiras" da sub-regiao do Abobral, Pantanal Mato-Grossense, tem como material de origem, conchas de moluscos transportadas da planicie de inundacao do rio Miranda, de aguas e sedimentos alcalinos. Os solos, desenvolvidos sobre material essencialmente carbonatico (calcimorficos), constituem-se em ilhas com vegetacao de mata semicaducifolia, isolada nas planicies inundaveis de solos acidos do rio Abobral. Os solos em condicoes de hidromorfismo temporario formam um epipedon molico sobre um horizonte petrocalcico. Pela classificacao do Departamento de Agricultura do E.U.A. de 1949 sao denominados de Calcissolos e de Aeric Petrocalcic Calciaquoll pela Soil Taxonomy. A vegetacao original e a secundaria (ruderal) sao descritas. O desmatamento e o cultivo... |
| Tipo: Circular Técnica (INFOTECA-E) |
Palavras-chave: Solo calcimorfico; Rio Abobral; Forrageira; Deficiencia de ferro; Nitritos; Plant; Iron defficiency; Nitrite; Petrocalcic calciaquoll.; Brachiaria; Clorose; Planta; Solo Ácido.; Pantanal; Forage; Chlorosis; Soil.. |
| Ano: 1985 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/787719 |
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| Assis,Tatiane M. de; Schilichting,Marcos V.; Lopes,Carla L.; Kunz,Airton; Gomes,Simone D.. |
| ABSTRACT The aim of this study was to monitor the stabilization of a sequential batch reactor (SBR) regarding the partial nitritation of poultry slaughterhouse wastewater, aiming at preparing it for a reactor with bacteria that promote anaerobic ammonia oxidation (anammox). A cylindrical reactor with a useful volume of 3.5 L, mechanical agitation (50 rpm), and suspended biomass was used in the experiment. The strategies adopted for nitrite-oxidizing bacteria (NOB) inhibition were cycle time (CT: 24, 16, 6, 5, 4 h and real-time monitoring), free ammonia accumulation, alkalinity restriction and low concentrations of dissolved oxygen (DO). The ammonification process, observed at all experimental phases, negatively influenced the control of partial nitritation... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Anammox; Deammonification; Nitrite; Nitrate; Nitrafying. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162017000200323 |
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| Reis,Patrícia Barros; Ramos,Rodrigo Mauro; Souza,Leonardo Francisco de; Cançado,Silvana de Vasconcelos. |
| The objective of this work was to validate the spectrophotometric method to detect and quantify nitrite using ham pate as a source. The validated analytical conditions were 540 nm wavelength and the samples reading between 40 to 70 minutes after addition of coloring agents. The tested performance criteria were: linearity, matrix effect, selectivity, detection and quantification limit, accuracy, precision and robustness. As the results have obtained linearity in the studied zone (0.125 to 3 g/mL) and matrix effect was not observed, there was not any interference from ascorbic acid, but interference occurred from sodium eritorbate, in concentrations above 2.5 mg/100g. The detection limit was defined as 12.5 mg of nitrite/kg for pate and the quantification... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Validation; Nitrite; Spectrophotometric method; Ham pate. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-82502009000100006 |
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