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Densities and speed of sound in aqueous ammonium sulfate solutions containing glycine or alanine

Martins, Mónia Andreia Rodrigues
Fonte: Instituto Politécnico de Bragança, Escola Superior de Tecnologia e Gestão Publicador: Instituto Politécnico de Bragança, Escola Superior de Tecnologia e Gestão
Tipo: Dissertação de Mestrado
ENG
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The main objectives of this work are the measurement of the densities and speed of sound in aqueous ammonium sulfate solutions containing glycine or alanine. The study of mixtures containing charged electric species is of great relevance for the chemical industry. In this work the new experimental information is combined with that collected from the open literature in order to contribute for an understanding of the forces that rule biologically important structures. A systematic experimental program is implemented to measure the densities and speed of sound in aqueous and in mixed aqueous solutions of ammonium sulfate, (0.1, 0.3, 0.7, 1.0, 1.3, and 2.0) mol•kg-1, containing glycine or alanine, using a digital densimeter at (278.15, 288.15, 298.15, 308.15, and 318.15) K. Density data have been used to calculate the partial molar volumes at infinite dilution which are evaluated and further used to obtain the corresponding transfer volumes for amino acids. Hydration numbers, temperature dependence, and side chain group contributions of amino acids have also been studied. The parameters obtained from the volumetric study are used to understand various mixing effects due to the interactions between amino acids and ammonium sulfate in aqueous solutions. The V(∅...

Influence of Urea and Ammonium Sulfate on Soil Acidity Indices in Lowland Rice Production

FAGERIA, N. K.; SANTOS, A. B. Dos; MORAES, M. F.
Fonte: TAYLOR & FRANCIS INC Publicador: TAYLOR & FRANCIS INC
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
46.69%
Urea and ammonium sulfate are principal nitrogen (N) sources for crop production. Two field experiments were conducted during three consecutive years to evaluate influence of urea and ammonium sulfate application on grain yield, soil pH, calcium (Ca) saturation, magnesium (Mg) saturation, base saturation, aluminum (Al) saturation, and acidity (H + Al) saturation in lowland rice production. Grain yield was significantly influenced by urea as well as ammonium sulfate fertilization. Soil pH linearly decreased with the application of N by ammonium sulfate and urea fertilizers. However, the magnitude of the pH decrease was greater by ammonium sulfate than by urea. The Ca and Mg saturations were decreased at the greater N rates compared to low rates of N by both the fertilizer sources. The Al and acidity saturation increased with increasing N rates by both the fertilizer sources. However, these acidity indices were increased more with the application of ammonium sulfate compared with urea. Rice grain yield had negative associations with pH, Ca saturation, Mg saturation, and base saturation and positive associations with Al and acidity saturation. This indicates that rice plant is tolerant to soil acidity.

DISTRIBUTION OF NITROGEN AMMONIUM SULFATE (N-15) SOIL-PLANT SYSTEM IN A NO-TILLAGE CROP SUCCESSION

da Silva Fernandes, Flavia Carvalho; Libardi, Paulo Leonel
Fonte: SOC BRASILEIRA DE CIENCIA DO SOLO; VICOSA Publicador: SOC BRASILEIRA DE CIENCIA DO SOLO; VICOSA
Tipo: Artigo de Revista Científica
POR
Relevância na Pesquisa
46.53%
DISTRIBUTION OF NITROGEN AMMONIUM SULFATE (N-15) SOIL-PLANT SYSTEM IN A NO-TILLAGE CROP SUCCESSION The N use by maize (Zea mays, L.) is affected by N-fertilizer levels. This study was conducted using a sandy-clay texture soil (Hapludox) to evaluate the efficiency of N use by maize in a crop succession, based on N-15-labeled ammonium sulfate (5.5 atom %) at different rates, and to assess the residual fertilizer effect in two no-tillage succession crops (signalgrass and corn). Two maize crops were evaluated, the first in the growing season 2006, the second in 2007, and brachiaria in the second growing season. The treatments consisted of N rates of 60, 120 and 180 kg ha(-1) in the form of labeled N-15 ammonium sulfate. This fertilizer was applied in previously defined subplots, only to the first maize crop (growing season 2006). The variables total accumulated N; fertilizer-derived N in corn plants and pasture; fertilizer-derived N in the soil; and recovery of fertilizer-N by plants and soil were evaluated. The highest uptake of fertilizer N by corn was observed after application of 120 kg ha(-1) N and the residual effect of N fertilizer on subsequent corn and Brachiaria was highest after application of 180 kg ha(-1) N. After the crop succession...

Fertilização com sulfato de amônio na cultura do milho em um solo de cerrado de Brasília sob pastagem de Brachiaria decumbens.; Corn fertilization with ammonium sulfate in a Brasília Cerrado soil under Brachiaria decumbens pasture.

Campos, Antonio Xavier de
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 22/02/2005 PT
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Nos cerrados tem-se adotado o sistema de integração lavoura-pecuária por tratarse de tecnologia de recuperação/renovação de pastagem em consórcio com culturas anuais, como a do milho. Nesse sistema a fertilização da lavoura recupera a pastagem e a mantém produtiva. Dentre os nutrientes aplicados nas fertilizações destaca-se o nitrogênio, que no solo sofre várias transformações e sua eficiência é comprometida com as épocas e doses de aplicação na pré-semeadura, em capim-Braquiária, e/ou em cobertura na cultura do milho. O objetivo do trabalho foi determinar as doses de nitrogênio na forma de sulfato de amônio e estabelecer a aplicação desse nutriente se em pré-semeadura e/ou em cobertura do milho no sistema de integração lavoura-pecuária. O experimento foi desenvolvido na Fazenda da Universidade de Brasília-UnB, em pastagem degradada de Brachiaria decumbens implantada em um LATOSSOLO VERMELHO AMARELO Distrófico típico. Procedeu-se à correção do solo com calcário dolomítico (1,3 t ha-1) e à adubação corretiva com 80 kg ha-1 de P2O5, 50 kg ha-1 de K2O, respectivamente, na forma de superfosfato simples e cloreto de potássio. O nitrogênio na forma de sulfato de amônio, nas doses de 60 e 120 kg ha-1...

Resposta de cultivares de trigo ao nitrogênio em relação às fontes e épocas de aplicação sob plantio direto e irrigação por aspersão

Megda, Márcio Mahmoud; Buzetti, Salatiér; Andreotti, Marcelo; Teixeira Filho, Marcelo Minhoto Carvalho; Vieira, Michele Xavier
Fonte: Editora da Universidade Federal de Lavras (UFLA) Publicador: Editora da Universidade Federal de Lavras (UFLA)
Tipo: Artigo de Revista Científica Formato: 1055-1060
POR
Relevância na Pesquisa
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A adubação nitrogenada é de suma importância para a cultura do trigo, já que o nitrogênio constitui um dos nutrientes mais exigidos por essa cultura e o rendimento desta é função direta da quantidade de nutrientes acumulados pela planta. Foram testados os adubos nitrogenados: sulfonitrato de amônio com inibidor de nitrificação, sulfato de amônio e uréia, na dose de 70 kg de N ha-1; em duas épocas de aplicação, na linha de semeadura ou em cobertura, além da testemunha que não recebeu nitrogênio como tratamento, em quatro cultivares de trigo irrigado: Empresa Brasileira de Pesquisa Agropecuária (EMBRAPA) 21, Empresa Brasileira de Pesquisa Agropecuária (EMBRAPA) 22, Empresa Brasileira de Pesquisa Agropecuária (EMBRAPA) 42 e IAC 370. O experimento foi conduzido sob irrigação por aspersão em dois anos (2005 e 2006) em área experimental pertencente à Faculdade de Engenharia de Ilha Solteira UNESP/São Paulo - Brasil. As fontes de nitrogênio sulfonitrato de amônio com inibidor de nitrificação, sulfato de amônio e uréia não diferiram entre si, porém foram superiores à testemunha, em relação à produtividade de grãos. A aplicação do N todo em cobertura proporcionou aumento na produtividade de grãos. O comportamento das cultivares quanto aos componentes de produção e produtividade foram dependentes do ano em estudo.; Nitrogen fertilization is very important to wheat crop...

Influência de fontes e modos de aplicação de nitrogênio nos componentes da produção e produtividade do milho irrigado no cerrado

Schiavinatti, Amanda Failli; Andreotti, Marcelo; Benett, Cleiton Gredson Sabin; Pariz, Cristiano Magalhães; Lodo, Bruno Nascimento; Buzetti, Salatiér
Fonte: Instituto Agronômico de Campinas Publicador: Instituto Agronômico de Campinas
Tipo: Artigo de Revista Científica Formato: 925-930
POR
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O objetivo do trabalho foi comparar os efeitos de fontes nitrogenadas: sulfonitrato de amônio com inibidor de nitrificação, sulfato de amônio e uréia, aplicadas na semeadura e/ou em cobertura, sobre teores de N foliar e clorofila, componentes da produção e produtividade do milho no verão, na região de cerrado sob irrigação. O trabalho foi desenvolvido em Latossolo Vermelho Distroférrico, nos anos agrícolas de 2006/2007 e 2007/2008. O delineamento experimental utilizado foi em blocos casualizados com quatro repetições, em esquema fatorial 3x5, sendo: três fontes de nitrogênio aplicadas na semeadura e/ou em cobertura, no estádio de 8 folhas completamente desdobradas, em 5 modos de aplicação (0 + 120; 30 + 90; 60 + 60; 90 + 30 e 120 + 0 kg ha-1 de N). O sulfonitrato de amônio + inibidor de nitrificação difere em relação ao sulfato de amônio quantos aos componentes da produção do milho cultivado no verão, independentemente da época de aplicação. A aplicação de 120 kg ha-1 de nitrogênio usando a uréia em aplicação única no estádio de oito folhas na cultura do milho e em períodos com alta precipitação pluvial afeta negativamente os teores foliares de N no milho e resulta em menor produtividade de grãos em relação à aplicação da mesma dose na semeadura.; The objective of this experiment was to compare the effect of nitrogen sources: ammonium sulfonitrate with nitrification inhibitor...

Doses and sources of nitrogen fertilizer and their effects on soil chemical properties and forage yield of Brachiaria brizantha cv. Xaraes

Heinrichs, Reges; Soares Filho, Ceclio Viega; Crociolli, Carlos Alberto; Monteiro de Figueiredo, Paulo Alexandre; Fruchi, Viviane Murer; Kodel, Francisco Juliano; Rodrigues, Tiago Arriero
Fonte: Universidade Estadual de Londrina (UEL) Publicador: Universidade Estadual de Londrina (UEL)
Tipo: Artigo de Revista Científica Formato: 1745-1754
ENG
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Forage plants, particularly the Brachiaria genus, are the main source of nutrients for cattle and are at times the only feed offered. The concentration of elements in the plant is related to the soil, fertilization, climate, season, variety, and cultural practices. An experiment on dystrophic Red-Yellow Latosol soil in Aracatuba, São Paulo was performed to evaluate the effects of the doses and sources of nitrogen fertilizers on the chemical properties of the soil and the dry matter yield of the grass Brachiaria brizantha cv. Xaraes. A randomized block design was employed involving three replicates in a 3 x 3 factorial, with three doses (100, 200 and 400 kg ha(-1) year(-1)) and three sources (Ajifer (R) L40, ammonium sulfate and urea) of nitrogen and a control treatment without nitrogen (zero). The greatest effects on the chemical properties of the soil as a function of nitrogen fertilization in the Xaraes grass were observed in the topsoil. The use of Ajifer (R) L40 and ammonium sulfate as sources of nitrogen had similar effects, with an increase in the sulfur content and a reduction in the soil pH at the superficial layer. The use of the fertilizers Ajifer (R) L40, ammonium sulfate and urea did not affect the micronutrient contents...

Crescimento de mudas de Schizolobium amazonicum (Huber ex Ducke) em substrato fertilizado com nitrogênio, fósforo e potássio

Caione, Gustavo; Lange, Anderson; Schoninger, Evandro Luiz
Fonte: Universidade Estadual Paulista Publicador: Universidade Estadual Paulista
Tipo: Artigo de Revista Científica Formato: 213-221
POR
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The nutritional management of seedlings in the nursery is one of the most important practices that influence seedling quality. The aim of this work was to evaluate the effect of nitrogen, phosphorus and potassium on the development of Schizolobium amazonicum seedlings grown in 250 cm containers with a commercial substrate in the North of Mato Grosso State, Brazil. The experimental design was completely randomized design with five treatments and five replications, each replication being represented by 24 seedlings. The treatments were: control (only commercial substrate); nitrogen fertilization (150 g m-3 N using ammonium sulfate + 1.0 kg of ammonium sulfate dissolved in 100 L of water and applied in coverage); phosphorus fertilization (300 g P2O 5 m-3 using simple superphosphate); potassium fertilization (100 g m-3 K2O using potassium chloride + 0.3 kg of potassium chloride dissolved in 100 L of water and applied in coverage) and; complete (a mixture of the three nutrients, 150, 300 and 100 g m-3 N, P2O5 and K2O, respectively + 1.0 kg of ammonium sulfate + 0.3 kg of potassium chloride). The commercial substrate was composted milled pine bark plus vermiculite. Evaluations of the seedlings were performed at 90 days after sowing. The complete treatment (NPK) gave the highest values for biometric and best plant indices...

Fertilizante nitrogenado alternativo na produção de matéria seca, nutrientes da parte aérea e atributos químicos do solo da Brachiaria brizantha cv. Xaraés

Parra, Fabiane Bicharelli Guimarães
Fonte: Universidade Estadual Paulista (UNESP) Publicador: Universidade Estadual Paulista (UNESP)
Tipo: Dissertação de Mestrado Formato: 55 f. : il. + 1 CD-ROM
POR
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Pós-graduação em Ciência Animal - FMVA; O objetivo do trabalho foi analisar o Ajifer L40 como fonte alternativa de fertilizante nitrogenado na produção de matéria seca, nutrientes da folha e atributos químicos do solo da Brachiaria brizantha cv. Xaraés (capim-Xaraés). O experimento foi conduzido em área do Sindicado Rural no município de Araçatuba, localizado na região da Alta Noroeste do Estado de São Paulo, no período de outubro de 2005 a maio de 2009 em solo classificado como Latossolo Vermelho Amarelo. O delineamento experimental foi em blocos casualizados com 10 tratamentos e três repetições. Os tratamentos foram arranjados em esquema fatorial 3 x 3 + 1, sendo três doses de nitrogênio (100, 200 e 400 kg ha-1 ano-1) e três fontes (uréia, sulfato de amônio e Ajifer L40) e um tratamento adicional (testemunha com dose 0 de N). Os fertilizantes apresentaram resposta máxima média dos quatro anos de avaliação na dose de 322 kg ha-1 de N. O teor de proteína bruta na parte aérea do capim-Xaraés foi linearmente crescente até a dose de 400 kg ha-1 de N para as três fontes estudadas. O Ajifer L40 e o sulfato de amônio foram importante fonte de enxofre para a nutrição das plantas. As fontes nitrogenadas Ajifer L40 e sulfato de amônio apresentaram comportamento semelhante...

Effects of Salinity Induced by Ammonium Sulfate Fertilizer on Root and Shoot Growth of Highbush Blueberry

Machado, Rui; Bryla, DR
Fonte: ISHS Publicador: ISHS
Tipo: Aula
POR
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Abstract Ammonium sulfate fertilizer is commonly used in highbush blueberry (Vaccinium corymbosum L.), but due to a high salt index, it often causes salt damage, particularly in young plants, when too much of the fertilizer is applied. A study was done to determine the sensitivity of blueberry to ammonium sulfate and identify the salinity threshold in which plant growth is affected by the fertilizer. One-year-old ‘Bluecrop’ blueberry plants were transplanted from 0.5-L pots to 8-L pots filled with a 1:1 (v/v) mixture of peat and pine bark and fertilized with four rates of 0, 0.25, 0.75, and 1.5 g•L-1 ammonium sulfate solution. Each solution was applied 2-3 times per week as needed for a total of 8 weeks. Electrical conductivity of the solutions (ECw) increased linearly with fertilizer rate and averaged 0.1, 0.5, 1.5, and 3.0 dS•m-1, respectively. Fertilizer rate had no effect on total shoot dry weight but significantly affected new root dry weight and partitioning of shoot biomass. Plants fertilized with 1.5 g•L-1 ammonium sulfate produced less roots and had a lower leaf to stem dry weight ratio than those fertilized with 0 or 0.25 g•L-1, which indicates that root and leaf growth in blueberry was sensitive to ECw between 1.5 and 3.0 dS•m-1. In the field...

Effects of Salinity Induced by Ammonium Sulfate Fertilizer on Root and Shoot Growth of Highbush Blueberry

Machado, Rui; Bryla, David; Vargas, Oscar
Fonte: ISHS Publicador: ISHS
Tipo: Artigo de Revista Científica
POR
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46.75%
Abstract Ammonium sulfate fertilizer is commonly used in highbush blueberry (Vaccinium corymbosum L.) but often causes salt damage, particularly in young plants, when high rates are applied. Three experiments were done to determine the sensitivity of ‘Bluecrop’ blueberry to ammonium sulfate and identify the salinity threshold at which plant growth was affected. In the first experiment, plants were grown in pots and fertigated two to three times per week with 0, 0.25, 0.75, and 1.5 g·L-1 ammonium sulfate solution. Electrical conductivity of the solutions (ECw) increased linearly with fertilizer rate and averaged 0.1, 0.5, 1.5, and 3.0 dS·m-1, respectively. Plants fertigated with 1.5 g·L-1 ammonium sulfate produced less leaves and roots and had a lower leaf to stem dry weight ratio than those fertilized with 0 or 0.25 g·L-1, which indicates that root and leaf growth in blueberry was sensitive to ECw > 1.5 dS·m-1. In the second experiment, plants in pots were fertilized with ammonium sulfate or urea at a frequency of three times per week, weekly, or every 28 days, using the same total amount of nitrogen (N) in each treatment over a 4-week period. In this case, plant growth was higher with ammonium sulfate than with urea but also higher...

Experimental design as a tool for optimization of C-phycocyanin purification by precipitation from Spirulina platensis

Silva,Lorena A.; Kuhn,Kátia R.; Moraes,Caroline C.; Burkert,Carlos A. V.; Kalil,Susana J.
Fonte: Sociedade Brasileira de Química Publicador: Sociedade Brasileira de Química
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/01/2009 EN
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C-phycocyanin is a natural blue dye that has been used as an additive in food and can be used to produce medications. The major goal of the present study was to obtain C-phycocyanin under the best operational conditions for high C-phycocyanin recovery and purity using the precipitation technique. Crude C-phycocyanin from Spirulina platensis was used. Optimization of the purification was carried out using experimental design. The effect of ammonium sulfate concentration, volume and of pH for resuspension were evaluated. Subsequently an ammonium sulfate fractionation study was carried out using the most suitable conditions found in the experimental design. The best purification condition was ammonium sulfate fractionation at 0-20%/20-50%, in relation to a resuspension volume/initial volume of 0.52 in a 7.0 pH buffer. Under these conditions, in an one-step purification only, the purity increased 70% compared to the initial extract, with an 83.8% recovery.

Enhancement of Population Size of a Biological Control Agent and Efficacy in Control of Bacterial Speck of Tomato through Salicylate and Ammonium Sulfate Amendments

Ji, Pingsheng; Wilson, Mark
Fonte: American Society for Microbiology Publicador: American Society for Microbiology
Tipo: Artigo de Revista Científica
Publicado em /02/2003 EN
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46.53%
Sodium salicylate and ammonium sulfate were applied to leaf surfaces along with suspensions of the biological control agents Pseudomonas syringae Cit7(pNAH7), which catabolizes salicylate, and Cit7, which does not catabolize salicylate, to determine whether enhanced biological control of bacterial speck of tomato could be achieved. Foliar amendment with salicylate alone significantly enhanced the population size and the efficacy of Cit7(pNAH7), but not of Cit7, on tomato leaves. Application of ammonium sulfate alone did not result in enhanced population size or biological control efficacy of either Cit7(pNAH7) or Cit7; however, when foliar amendments with both sodium salicylate and ammonium sulfate were applied, a trend toward further increases in population size and biological control efficacy of Cit7(pNAH7) was observed. This study demonstrates the potential of using a selective carbon source to improve the efficacy of a bacterial biological control agent in the control of a bacterial plant disease and supports previous conclusions that the growth of P. syringae in the phyllosphere is primarily carbon limited and secondarily nitrogen limited.

Mechanism by which ammonium bicarbonate and ammonium sulfate inhibit mycotoxigenic fungi.

DePasquale, D A; Montville, T J
Fonte: PubMed Publicador: PubMed
Tipo: Artigo de Revista Científica
Publicado em /12/1990 EN
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46.71%
In this study we examined the mechanism by which ammonium bicarbonate inhibits mycotoxigenic fungi. Elevated extracellular pH, alone, was not responsible for the antifungal activity. Although conidia of Penicillium griseofulvum and Fusarium graminearum had internal pH (pHi) values as high as 8.0 in buffer at an external pH (pHo) of 9.5, their viability was not markedly affected. The pHi values from conidia equilibrated in glycine-NaOH-buffered treatments without ammonium bicarbonate or ammonium sulfate were similar to values obtained from buffered treatments containing the ammonium salts. Thus, inhibition did not appear to be directly related to increased pHi. Ammonium sulfate in buffered media at pH greater than or equal to 8.7 was as inhibitory as ammonium bicarbonate, but was completely ineffective at pH less than or equal to 7.8. The hypothesis that free ammonia caused the fungal inhibition was tested by using ammonium sulfate as a model for ammonium bicarbonate. Viability, expressed as log CFU/ml, and percent germination of P. griseofulvum and F. graminearum decreased dramatically as the free ammonia concentration increased. Germination rate ratios (the germination rate in buffered ammonium sulfate divided by the germination rate in buffer alone) decreased linearly as the free ammonia concentration increased...

Ammonium sulfate and MALDI in-source decay: a winning combination for sequencing peptides

Delvolve, Alice; Woods, Amina S.
Fonte: PubMed Publicador: PubMed
Tipo: Artigo de Revista Científica
Publicado em 01/12/2009 EN
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In previous papers we highlighted the role of ammonium sulfate in increasing peptide fragmentation by in source decay (ISD). The current work systematically investigated effects of MALDI extraction delay, peptide amino acid composition, matrix and ammonium sulfate concentration on peptides ISD fragmentation. The data confirmed that ammonium sulfate increased peptides signal to noise ratio as well as their in source fragmentation resulting in complete sequence coverage regardless of the amino acid composition. This method is easy, inexpensive and generates the peptides sequence instantly.

A Mathematical Relationship for Hydromorphone Loading into Liposomes with Trans-Membrane Ammonium Sulfate Gradients

TU, SHENG; MCGINNIS, TAMARA; KRUGNER-HIGBY, LISA; HEATH, TIMOTHY D.
Fonte: PubMed Publicador: PubMed
Tipo: Artigo de Revista Científica
Publicado em /06/2010 EN
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46.56%
We have studied the loading of the opioid hydromorphone into liposomes using ammonium sulfate gradients. Unlike other drugs loaded with this technique, hydromorphone is freely soluble as the sulfate salt, and, consequently, does not precipitate in the liposomes after loading. We have derived a mathematical relationship that can predict the extent of loading based on the ammonium ion content of the liposomes and the amount of drug added for loading. We have adapted and used the Berthelot indophenol assay to measure the amount of ammonium ions in the liposomes. Plots of the inverse of the fraction of hydromorphone loaded versus the amount of hydromorphone added are linear, and the slope should be the inverse of the amount of ammonium ions present in the liposomes. The inverse of the slopes obtained closely correspond to the amount of ammonium ions in the liposomes measured with the Berthelot indophenol assay. We also show that loading can be less than optimal under conditions where osmotically driven loss of ammonium ions or leakage of drug after loading may occur.

Influence of urea and ammonium sulfate on soil acidity indices in lowland rice production.

FAGERIA, N. K.; SANTOS, A. B. dos; MORAES, M. F.
Fonte: Communications in Soil Science and Plant Analysis, New York, v. 41, n. 13, p. 1565-1575, Jul. 2010. Publicador: Communications in Soil Science and Plant Analysis, New York, v. 41, n. 13, p. 1565-1575, Jul. 2010.
Tipo: Artigo em periódico indexado (ALICE)
EN
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Urea and ammonium sulfate are principal nitrogen (N) sources for crop production. Two field experiments were conducted during three consecutive years to evaluate influence of urea and ammonium sulfate application on grain yield, soil pH, calcium (Ca) saturation, magnesium (Mg) saturation, base saturation, aluminum (Al) saturation, and acidity (H + Al) saturation in lowland rice production. Grain yield was significantly influenced by urea as well as ammonium sulfate fertilization. Soil pH linearly decreased with the application of N by ammonium sulfate and urea fertilizers. However, the magnitude of the pH decrease was greater by ammonium sulfate than by urea. The Ca and Mg saturations were decreased at the greater N rates compared to low rates of N by both the fertilizer sources. The Al and acidity saturation increased with increasing N rates by both the fertilizer sources. However, these acidity indices were increased more with the application of ammonium sulfate compared with urea. Rice grain yield had negative associations with pH, Ca saturation, Mg saturation, and base saturation and positive associations with Al and acidity saturation. This indicates that rice plant is tolerant to soil acidity.; 2010

Volatility of Organic Aerosol: Evaporation of Ammonium Sulfate/Succinic Acid Aqueous Solution Droplets

YLI-JUUTI Taina; ZARDINI ALESSANDRO; ERIKSSON Axel C.; HANSEN Anne M.; PAGELS Joakim H; SWIETLICKI Erik; SVENNINGSSON Birgitta; GLASIUS Marianne; WORSNOP Douglas; RIIPINEN Ilona; BILDE Merete
Fonte: AMER CHEMICAL SOC Publicador: AMER CHEMICAL SOC
Tipo: Articles in Journals Formato: Printed
ENG
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46.65%
Condensation and evaporation modify the properties and effects of atmospheric aerosol particles. We studied the evaporation of aqueous succinic acid and succinic acid/ammonium sulfate droplets to obtain insights on the effect of ammonium sulfate on the gas/particle partitioning of atmospheric organic acids. Droplet evaporation in a laminar flow tube was measured in a Tandem Differential Mobility Analyzer setup. A wide range of droplet compositions was investigated, and for some of the experiments the composition was tracked using an Aerosol Mass Spectrometer. The measured evaporation was compared to model predictions where the ammonium sulfate was assumed not to directly affect succinic acid evaporation. The model captured the evaporation rates for droplets with large organic content but overestimated the droplet size change when the molar concentration of succinic acid was similar to or lower than that of ammonium sulfate, suggesting that ammonium sulfate enhances the partitioning of dicarboxylic acids more than currently expected from simple mixture thermodynamics. If extrapolated to the real atmosphere, these results imply enhanced partitioning of secondary organic compounds in environments dominated by inorganic aerosol.; JRC.F.8-Sustainable Transport

Optimization of Ammonium Sulfate Concentration for Purification of Colorectal Cancer Vaccine Candidate Recombinant Protein GA733-FcK Isolated from Plants

Park, Se-Ra; Lim, Chae-Yeon; Kim, Deuk-Su; Ko, Kisung
Fonte: Frontiers Media S.A. Publicador: Frontiers Media S.A.
Tipo: Artigo de Revista Científica
Publicado em 27/11/2015 EN
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46.6%
A protein purification procedure is required to obtain high-value recombinant injectable vaccine proteins produced in plants as a bioreactor. However, existing purification procedures for plant-derived recombinant proteins are often not optimized and are inefficient, with low recovery rates. In our previous study, we used 25–30% ammonium sulfate to precipitate total soluble proteins (TSPs) in purification process for recombinant proteins from plant leaf biomass which has not been optimized. Thus, the objective in this study is to optimize the conditions for plant-derived protein purification procedures. Various ammonium sulfate concentrations (15–80%) were compared to determine their effects on TSPs yield. With 50% ammonium sulfate, the yield of precipitated TSP was the highest, and that of the plant-derived colorectal cancer-specific surface glycoprotein GA733 fused to the Fc fragment of human IgG tagged with endoplasmic reticulum retention signal KDEL (GA733P-FcK) protein significantly increased 1.8-fold. SDS-PAGE analysis showed that the purity of GA733P-FcK protein band appeared to be similar to that of an equal dose of mammalian-derived GA733-Fc (GA733M-Fc). The binding activity of purified GA733P-FcK to anti-GA733 mAb was as efficient as the native GA733M-Fc. Thus...

Efeito da adição de sulfato de amônio sobre a produção de ácido succínico durante a fermentação alcoólica; The effect of ammonium sulfate upon succinic acid production during alcoholic fermentation

Gutierrez, L.E.
Fonte: Universidade de São Paulo. Escola Superior de Agricultura Luiz de Queiroz Publicador: Universidade de São Paulo. Escola Superior de Agricultura Luiz de Queiroz
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; ; Formato: application/pdf
Publicado em 01/01/1988 POR
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A produção de ácido succínico por leveduras durante a fermentação alcoólica de mosto de melaço suplementado com 25, 50 e 100 ppm de nitrogênio na forma de sulfato de amônio foi determinada por cromatografia em fase gasosa. A adição de nitrogênio amoniacal não afetou significativamente a produção de álcool etílico. Houve redução significativa no teor de ácido succínico com o aumento da quantidade de nitrogênio adicionada.; Succinic acid production by yeasts during alcoholic fermentation of cane molasse supplemented with 25, 50 and 100 ppm of nitrogen in the form of ammonium sulfate was determined by gas-liquid chromatography. Ethanol production was not effected by the different levels of nitrogen, but there was a significant reduction in the content of succinic acid which was inversely related with the ammonium sulfate concentration in the medium.