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| Registros recuperados: 19 | |
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| FIGUEROA,FÉLIX L.; VIÑEGLA,BENJAMÍN. |
| The effects of solar ultraviolet (UV) radiation during daily cycles on photosynthesis and two key enzymes involved in carbon incorporation, the carbonic anhydrase, and in inorganic nitrogen reduction, the nitrate reductase, of macroalgae from southern Spain are presented. During daily cycles, photoinhibition in several intertidal macroalgae, expressed as decrease in the effective quantum yield from the morning to noon time, was linearly dependent on the daily integrated irradiance. However, recovery, expressed as the increase in the effective quantum yield from noon to the afternoon, presented a different pattern; full recovery was found below daily integrated irradiance of 1.0 x10(4) kJ m-2. However, recovery reached only 50 % at higher irradiances. The... |
| Tipo: Journal article |
Palavras-chave: Carbonic anhydrase; Chlorophyll fluorescence; Effective quantum yield; Nitrate reductase; Ultraviolet radiation. |
| Ano: 2001 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2001000200003 |
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| IRIARTE,JOSÉ L; GONZÁLEZ,RODRIGO R; QUIÑONES,RENATO A; KANG,SUNG-HO; SHIM,JAE H; VALENZUELA,CYNTHIA P. |
| Given the potential significance of enzyme activities as a link between internal metabolic pathways and environmental nutrients, we investigated the relationships of nitrate reductase (NR) and alkaline phosphatase (AP) with primary production and inorganic nutrients in South Shetland Islands, Antarctica. Enzymatic activities of the phytoplankton (0.7-210 µm), primary productivity, autotrophic biomass and inorganic nutrients were studied in the upper 100 m depth at nine stations during a cruise in the northwestern area of South Shetland Islands (Antarctica), during late austral spring (December 2000). NR activities fluctuated between 0 and 42.8 nmol L-1 h-1 (mean = 10.08 nmol L-1 h-1, SD = 10.42 nmol L-1 h-1), AP activities between 0.81 and 5.67 nmol L-1... |
| Tipo: Journal article |
Palavras-chave: Nitrate reductase; Alkaline phosphatase; Primary productivity; Chlorophyll; Antarctica. |
| Ano: 2006 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2006000400009 |
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| Hasan,Syed Aiman; Hayat,Shamsul; Wani,Arif Shafi; Ahmad,Aqil. |
| Cobalt (Co) affords both beneficial as well as toxic effects to plants. The present study was performed with an aim to find out the varietal differences among five tomato cultivars against the Co induced changes in growth, photosynthesis, nitrate reductase (E.C.1.6.6.1), carbonic anhydrase (E.C.4.2.1.1), antioxidative enzymes i.e. peroxidase (E.C.1.11.1.7), catalase (E.C.1.11.1.6), superoxide dismutase (E.C.1.15.1.1) and that of proline content. Seeds of tomato (varieties, K-25, NTS-9, NBR-Uday, Sarvodya, and Malti) were soaked in 0, 100, 200 or 300 µM CoCl2 for 0, 4, 8, 12 h (shotgun approach) and sampled at 30 days after sowing. All the varieties showed significantly different response to different treatment combinations. Despite substantial varietal... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Antioxidative enzyme; Carbonic anhydrase; Cobalt; Nitrate reductase; Photosynthesis; Tomato. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202011000300001 |
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| MAJEROWICZ,NIDIA; PEREIRA,JOSÉ M.S.; MEDICI,LEONARDO O.; BISON,ODAIR; PEREIRA,MAURÍCIO B.; SANTOS JÚNIOR,ULYSSES M.. |
| O uso de fertilizantes, além dos riscos de contaminação ambiental, onera o agricultor, chegando a representar 40% dos custos de produção na cultura do milho. O presente estudo visa identificar características fisiológicas relacionadas com o aumento da eficiência do uso do nitrogênio e assim subsidiar programas de melhoramento genético direcionados para obtenção de genótipos de milho produtivos em solos com baixa disponibilidade de nitrogênio. Foram estudadas as variedades de milho Pedra Dourada, Catetão, Carioca (variedades locais, não melhoradas), BR 106, BR 105 (variedades melhoradas em solos férteis), Nitroflint e Nitrodente (variedades melhoradas em solos pobres em N). Plântulas de milho receberam solução nutritiva de Hoagland modificada quanto às... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Nitrogen assimilation; Glutamine synthetase; Nitrate reductase; Photosynthetic pigments; Zea mays L.. |
| Ano: 2002 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042002000200002 |
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| Meneguello,Jean Eduardo; Silva,João Vitor de Oliveira; Lima,Letícia Silva; Siqueira,Vera Lucia Dias; Scodro,Regiane Bertin de Lima; Caleffi-Ferracioli,Katiany Rizzieri; Cardoso,Rosilene Fressatti. |
| ABSTRACT Microscopy and bacterial culture are the main tools in the diagnosis of tuberculosis. Since the slow growth of Mycobacterium tuberculosis impairs rapid diagnosis strategies, especially in countries where the latter are the only available resources, the ongoing development of new and inexpensive tools based on mycobacterial metabolism optimizing growth detection with preliminary identification is greatly welcome. When compared to the other species from the M. tuberculosis complex, M. tuberculosis is a strong nitrate reducer. Current assay compares the nitrate reductase activity of M. tuberculosis from pulmonary specimens cultivated in nitrate-supplemented media. Fifty-five sputum samples were decontaminated and inoculated in conventional... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Tuberculosis; Mycobacteria/diagnosis/identification; Nitrate reductase. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-82502018000100602 |
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| Alyemeni,Mohammed Nasser; Hayat,Shamsul; Wijaya,Leonard; Anaji,Abdullah. |
| Prior to sowing, seeds of Brassica juncea Czern and Coss cv. Varuna were soaked in water (controls) or in 50, 100 or 150 mM of sodium chloride (NaCl) for 6 h. The resulting plants, at 15, 30 and 45 days after sowing (DAS) were either not treated (controls) or were treated with aqueous solutions of the hormone 28-homobrassinolide (HBL), which was applied to their foliage in concentrations of 10-10, 10-8 or 10-6 M. The concentration of NaCl showed an inverse correlation with the activity of nitrate reductase (EC 1.6.6.1), the activity of carbonic anhydrase (EC 4.2.1.1), chlorophyll content at 60 DAS, the rate of photosynthesis at 60 DAS, and seed yield at 140 DAS (at harvest), all of which decreased in parallel with increases in NaCl concentration. However,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Carbonic anhydrase; Chlorophyll; Homobrassinolide; Nitrate reductase; Seed yield. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062013000300007 |
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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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| Registros recuperados: 19 | |
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