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| Registros recuperados: 31 | |
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| Loomis, John B.; Bell, Paul; Cooney, Helen; Asmus, Cheryl. |
| We estimate adults’ willingness to pay (WTP) to reduce health risks to their own or other families’ infants to test for altruism. A conjoint analysis of adults paying for bottled water found marginal WTP for reduction in risk of shock, brain damage, and mortality in the cash treatment of $2, $3.70, and $9.43, respectively. In the hypothetical market these amounts were $14, $26, and $66, indicating substantial hypothetical bias, although not unexpected due to the topic of infant health. Statistical tests confirm a high degree of altruism in our WTP results, and altruism held even when real money was involved. |
| Tipo: Journal Article |
Palavras-chave: Altruism; Conjoint; Drinking water; Nitrates; Validity; Willingness to pay; Agricultural and Food Policy; Consumer/Household Economics; Food Consumption/Nutrition/Food Safety; Health Economics and Policy; Institutional and Behavioral Economics; I10; Q53. |
| Ano: 2009 |
URL: http://purl.umn.edu/56657 |
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| Crutchfield, Stephen R.; Cooper, Joseph C.; Hellerstein, Daniel. |
| Nitrates in drinking water, which may come from nitrogen fertilizers applied to crops, are a potential health risk. This report evaluates the potential benefits of reducing human exposure to nitrates in the drinking water supply. In a survey, respondents were asked a series of questions about their willingness to pay for a hypothetical water filter, which would reduce their risk of nitrate exposure. If nitrates in the respondent's drinking water were to exceed the EPA minimum safety standard, they would be willing to pay $45 to $60, per household, per month, to reduce nitrates in their drinking water to the minimum safety standard. There are 2.9 million households in the four regions studied (White River area of Indiana, Central Nebraska, Lower... |
| Tipo: Report |
Palavras-chave: Water quality; Drinking water; Nitrates; Benefits; Contingent valuation; Resource /Energy Economics and Policy. |
| Ano: 1997 |
URL: http://purl.umn.edu/34025 |
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| Premuzic,Z; Palmucci,HE; Tamborenea,J; Nakama,M. |
| The addition of chlorine constitutes an economical disinfection method for closed, soil-less systems. Three quantities of sodium hypochlorite (0.55, 5.5 and 11 ppm) were applied to closed, soil-less greenhouse- grown lettuce (Lactuca sativa), to study the effect on its production (fresh weight and dry matter) and some commercial and nutritional quality factors (phytotoxicity, Vitamin C, nitrates). Sodium hypochlorite was weekly added within the nutrient solution, and the chemical properties (pH, EC and chlorides) of the recycled solution were measured. Damage to leaves was evaluated 15 days before harvest. Chlorination produced different effects regarding both production and quality. All treatments presented plants with excellent commercial weight,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Chlorination; Lactuca sativa; Nitrates; Phytotoxicity; Vitamin C. |
| Ano: 2007 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572007000100010 |
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| Kolaitis, L.N.; Bruynseels, F.; Van Grieken, R.; Andreae, M.O.. |
| In open ocean waters the predominant volatile sulfur compound is dimethyl sulfide (DMS), representing almost 90% of the marine sulfur emissions. Methanesulfonic acid (MSA), one of the oxidation products of DMS, is consequently an important constituent of marine aerosols. Laser microprobe mass analysis (LAMMA) has been used for single-particle analysis of particles collected in the marine boundary layer. MSA, like the non-sea-salt sulfate, is mainly associated with the smallest aerosol particles, whose LAMMA spectra match the reference fingerprint spectra of MSA salts, sodium methanesulfonate and ammonium methanesulfonate. The presence of nitrate and heavy metal ions in the LAMMA spectra can reveal, to a certain extent, the degree of air pollution at the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Aerosols; Air pollution; Boundary layers; Heavy metals; Marine environment; Nitrates; Particle size; Sulphates. |
| Ano: 1989 |
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3177 |
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| Mertens, J.; Massart, D.L.. |
| A simple and rapid method for the determination of nitrate in seawater of high nitrate content (>1 ppm) is proposed. The absorption of the nitrate ion is measured at 210 and 220 mµ. The sample is treated with a measured quantity of hydrochloric acid to eliminate the carbonate and bicarbonate interferences and measured against a nitrate free blank prepared by reduction of the nitrate to ammonia with Raney nickel. The addition of HCl permits also storage of the sample without special precautions and the use of the blank eliminates the most serious of the interferences (bromide) expected in seawater. The interference of organic matter limits however the applicability of the method to concentrations higher than 1 ppm. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Marine environment; Nitrates; Spectroscopy. |
| Ano: 1971 |
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3424 |
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| SANTOS, I. L. dos; OLIVEIRA, A. D. de; FIGUEIREDO, C. C. de; CEOLIN, J. G. R.; SILVA, F. R. da C.; SOUSA, C. A. N. de. |
| O objetivo deste trabalho foi avaliar os fluxos de óxido nitroso do solo, decorrentes dos resíduos culturais da soja sob sistema de manejo convencional, em pousio e, sob plantio direto com sorgo, tendo o cerrado como ambiente de referência. Para tanto, utilizou-se de um experimento de longa duração, localizado na Embrapa Cerrados, Planaltina, DF. As coletas de amostras de ar, para determinação das emissões de N2O, aconteceram semanalmente, pelo método da câmara estática, com determinação por cromatografia gasosa. Nos mesmos locais, foram coletadas amostras de solo para determinação da umidade, espaço poroso saturado por água, densidade do solo e teores de nitrato. O cerrado nativo apresentou os menores fluxos de N2O. O uso de fertilizante nitrogenado no PD... |
| Tipo: Separatas |
Palavras-chave: Espaço poroso saturado por água; Solo; Nitrato; Sorgo; Soja; Plantio direto; Cerrado; Soil; Nitrates; Holcus; Soybeans; No-tillage; Savannas; Brazil. |
| Ano: 2015 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1039273 |
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| Eaucea,; Prou, Jean. |
| L'objet de l'étude est de décrire les liens principaux entre l'hydrologie de la Charente et les constats qualitatifs dans le bassin de Marennes, ainsi que l'estimation des flux continentaux, sur la base des données des stations de Fontenelles et de Boyard entre 1977 et 2006. Du fait de l'influence de la marée, il n'est pas possible de mesurer les débits de la Charente dans sa partie aval. Ils ont donc été reconstitués à partir des stations de Saint-Savinien, du pont de Beillant, de Carillon, du Moulin de Chatre, de la Lijardière, de Jarnac, de Vindelle et de Foulpougne, en fonction de la disponibilité et de la fiabilité des données. Les mesures à Fontenelles et Boyard ont été réalisées de façon à disposer d'une gamme variée de situations par rapport au... |
| Tipo: Text |
Palavras-chave: Hydrologie; Flux continentaux; Cycle de marée; Nitrates; Phosphates; Production primaire; Marennes Oléron; Charente. |
| Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/00083/19419/17030.pdf |
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| JANUÁRIO LELIS, A. L.. |
| ABSTRACT: Brazil occupies a prominent position in in livestock production, being considered one of the most important beef suppliers in the world. In order to meet the demand of a growing population, the livestock sector needs to increase its production efficiently, reducing the environmental impact, which has received numerous criticisms in animal production. In order to produce with sustainability, it is necessary to improve productivity, through adequate management of pastures and strategies that reduce the seasonal effect of forage production during certain seasons of the year. One of the strategies that can be adopted to reduce the effect of low forage availability due to seasonality is the deferred pastures associated with nutritional... |
| Tipo: Teses |
Palavras-chave: Bovinos de corte; Diferimento; Marandu; Forage stockpiling; Nitrato; Beef cattle; Nitrates. |
| Ano: 2021 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1146549 |
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| Mensi, F.; Ksouri, J.; Seale, E. G.; Romdhane, M.S.. |
| L'exploitation des algues rouges appartenant au genre Gracilaria pour l'extraction de l'agar a considérablement augmenté au cours des dernières décennies. En Tunisie Gracilaria verrucosa (Hudson) Papenfuss 1950 (Rhodophyta), est candidate pour la culture dans la lagune de Bizerte (Nord de la Tunisie) où ne pousse que sur une courte période de l’année. Ainsi, le but de cette étude est de recueillir des informations de base sur sa croissance dans cette région. Les effets de la salinité des sources d’azote et du phosphore ainsi que leurs concentrations sur la croissance de cette algue ont été étudiés à l'échelle de laboratoire en utilisant la méthodologie de surface des réponses. Afin de déterminer les interactions entre les variables et les niveaux optimaux... |
| Tipo: Journal Contribution |
Palavras-chave: Algae; Ammonium; Red algae; Salinity; Growth; Nitrates. |
| Ano: 2011 |
URL: http://hdl.handle.net/1834/4734 |
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| CERDEIRA, A. L.; PARAIBA, L. C.; KATAGUIRI, K.; BOLONHEZI, D.; GOMES, M. A. F.; SPADOTTO, C. A.; FARJANI NETO, C.; MATALLO, M. B.; MOMM, H.. |
| The region of Ribeirão Preto City, southeastern Brazil, is an important sugar cane and recharge area for groundwater of the Guarany aquifer. This research was conducted to evaluate the potential contamination of groundwater with nitrates in the area and in surrounding municipal wells. No significant amount of nitrate was found in the recharge agricultural area. However, nitrate levels were detected at concentrations higher than the Maximum Concentration Level (MCL) of 6.0 mg/L in a downtown, urban, well located away from agriculture, which had no history of nitrogen application, reaching values higher than the maximum risk coefficient for infants (RC) of 1.0. |
| Tipo: Separatas |
Palavras-chave: Aqüífero Guarani; Ribeirão Preto; Águas subterrâneas; Poluição da água; Nitrato; Groundwater contamination; Nitrates. |
| Ano: 2008 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/31619 |
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| Herbert, R. |
| Seasonal data and depth profiles using super(15)N-labelled NO sub(3)u- show that denitrification (77-90% of NO sub(3)u- respired) rather than NO sub(3)u- dissimilation to NH sub(4)u+ was the principal route of nitrate reduction in Kingoodie Bay sediments. Populations of both groups of NO sub(3)u- reducing bacteria were highest in the 0-20 mm horizon in those sediments where highest rates of NO sub(3)u- respiration were recorded (28.56 mu g N.d super(-1) dry wt. sediment super(-1)). Autotrophic nitrification rates shared a marked seasonality with highest rates (0.92 mu g N.d super(-1).g dry wt. sediment super(-1)) occurring during the summer. Maximum populations of autotrophic nitrifying bacteria were also found in the 0-20 mm sediment horizon and these... |
| Tipo: Text |
Palavras-chave: Seasonal variations; Bacteria; Estuaries; Sediment chemistry; Biogeochemistry; Ammonia; Nitrates; Nitrogen cycle. |
| Ano: 1984 |
URL: http://archimer.ifremer.fr/doc/1984/acte-971.pdf |
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| OLIVEIRA, A. D. de; SANTOS, I. L.; FIGUEIREDO, C. C.; MALAQUIAS, J. V.; SANTOS JÚNIOR, J. D. G.; CARVALHO, A. M. de. |
| Avaliou-se as alterações na concentração de nitrato (NO3-) e amônio (NH4+) em Latossolo Vermelho sob o sistema de plantio direto com soja (PDS), plantio direto com milho (PDM) e cerrado sentido restrito (CE). A área está localizada na Embrapa Cerrados, DF. O delineamento experimental foi em blocos ao acaso com três repetições em experimento de 19 anos com rotação anual soja-milho. A soja foi semeada no dia 20/10/2013 e o milho híbrido no dia 22/10/2013. Foram realizadas coletas por parcela nos dias 07, 11, 12, 13, 14, 20 e 27/11/2013, nos intervalos de profundidade de 0-5 cm e 5 -10 cm. As determinações das formas de N e do teor de água do solo foram realizadas pelos métodos Kjeldahl e gravimétrico. Nesse intervalo de sete dias de avaliação, independente... |
| Tipo: Separatas |
Palavras-chave: Nitrogênio mineral; Soybean.; Solo; Soja; Milho; Nitrato; Nitrato de Amônio; Plantio direto; Umidade do solo; Nitrogênio; Cerrado; Zea Mays.; Soil; Nitrates; Ammonium nitrate; No-tillage; Soil water content; Nitrogen; Savannas; Brazil.. |
| Ano: 2014 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1014022 |
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| RIBEIRO, F. C.; OLIVEIRA, A. D. de; FERREIRA, E. A. B.; BISPO, O. B.; ZANSAVIO, A. M. de O.; GATTO, A.. |
| O nitrogênio ocupa lugar de destaque entre os elementos essenciais ao desenvolvimento das plantas e pode ser absorvido na forma nitrato (NO3-) e amônio (NH4+). Este trabalho avaliou em diferentes camadas do solo a variação dos teores de (NO3-) e (NH4+) no período seco, em Latossolo Vermelho distrófico no Distrito Federal, sob quatro tratamentos: cerrado sentido restrito (cerrado típico e denso), florestas plantadas de eucalipto de diferentes idades. Cada tratamento foi composto de três parcelas. Próximo de cada parcela foram lançados oito vezes um gabarito metálico de 50x50 cm para análise da camada de serapilheira em contato com o solo e para as demais camadas foram coletadas oito amostras de solo nos intervalos de profundidades de 0-5 e 5-10 cm, no mês... |
| Tipo: Separatas |
Palavras-chave: Amônio; Solo florestal; Eucalipto; Nitrogênio; Nitrato; Cerrado; Forest soils; Eucalyptus; Nitrogen; Nitrates; Ammonium fertilizers; Savannas; Brazil. |
| Ano: 2015 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1039266 |
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| Registros recuperados: 31 | |
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