Consulta: subjectFacets:"Uptake"
Registros recuperados: 15
Data/hora: 03/06/2024 07:55:39

Потребление и время оборота неорганического фосфора в водах Черного моря в осенний период
Provedor de dados: 13
Autores: Пархоменко, А. В.; Кирикова, М. В.
Рассмотрены результаты исследования скорости потребления неорганического фосфора микропланктоном (Vp) и времени его оборота (Т) в водах Черного моря. У побережья Крыма и северо-западной части моря средние величины скорости (Vp) в верхнем перемешанном слое (ВПС) составили 61∙10-4, в глубоководной области моря - 88∙10-4 мкМ∙ч-1. Время оборота фосфатов в ВПС у побережья Крыма и глубоководной области моря изменялось от 0.26 до 0.8 сут, в северо-западной части увеличивалось до 1.5 сут, под ВПС 16 – 180 сут. В период осенней сукцессии фитопланктонного сообщества основную роль в потреблении фосфатов микропланктоном играла размерная фракция 0.4 – 20 мкм, её вклад составлял (97 %). На основании атомарного отношения скоростей потребления неорганических форм...
Tipo: Journal Contribution
Palavras-chave: Чёрное море; Неорганический фосфор; Скорость; Время оборота; Микропланктон; Black Sea; Inorganic phosphorus; Uptake; Rate; Microplankton.
Ano: 2004
URL: http://repository.ibss.org.ua/dspace/handle/99011/56

Variations saisonnières de l'absorption de l'azote dans un système brassé peu profond (Manche occidentale)
Provedor de dados: 5
Autores: Maguer, Jf; Lecorre, P; Madec, C.
Seasonal changes in inorganic (NH4+; NO3-; NO2-) and organic (urea) nitrogen uptake were studied with N-15 as a tracer at a shallow station (depth: 22 m) in permanently well-mixed waters of the Western English Channel. Uptake of all the four nutrients was maximum in spring. Nitrate uptake accounted for a third of the total during spring phytoplankton growth, but decrease in summer. This decrease was related to the low ambient nitrate concentrations in early summer and to an inhibition of uptake by high concentrations in late summer. Ammonium was taken up in significant amounts from the beginning of spring (46 % of total uptake), increasing to 59 % in summer. In contrast with nitrate, ammonium concentrations during summer were sufficiently high to saturate...
Tipo: Text
Palavras-chave: Nitrogen; Uptake; Seasonal variations; Western English Channel.
Ano: 1996
URL: http://archimer.ifremer.fr/doc/00096/20723/18360.pdf

Uptake of dissolved inorganic and organic nitrogen by the benthic toxic dinoflagellate Ostreopsis cf. ovata
Provedor de dados: 5
Autores: Jauzein, Cecile; Couet, Douglas; Blasco, Thierry; Lemee, Rodolphe.
Environmental factors that shape dynamics of benthic toxic blooms are largely unknown. In particular, for the toxic dinoflagellate Ostreopsis cf. ovata, the importance of the availability of nutrients and the contribution of the inorganic and organic pools to growth need to be quantified in marine coastal environments. The present study aimed at characterizing N-uptake of dissolved inorganic and organic sources by O. cf. ovata cells, using the 15N-labelling technique. Experiments were conducted taking into account potential interactions between nutrient uptake systems as well as variations with the diel cycle. Uptake abilities of O. cf. ovata were parameterized for ammonium (NH4+), nitrate (NO3−) and N-urea, from the estimation of kinetic and inhibition...
Tipo: Text
Palavras-chave: Uptake; Nitrogen; Dinoflagellate; Ostreopsis; Kinetics; Interactions.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00382/49368/49840.pdf

Gut passage times in two bivalve molluscs fed toxic microalgae: Alexandrium minutum, A-catenella and Pseudo-nitzschia calliantha
Provedor de dados: 5
Autores: Gueguen, Marielle; Lassus, Patrick; Laabir, Mohamed; Bardouil, Michele; Baron, Regis; Sechet, Veronique; Truquet, Philippe; Amzil, Zouher; Barille, Laurent.
The occurrence of new phytoplankton species in a coastal area may be explained by the import of shellfish containing whole live algal cells in their digestive tracts. Indeed, shellfish containing toxic algal cells can induce both primary contaminations in safe areas ( initially free from toxic microalgae), and secondary contaminations of other shellfish growing in the same area via the faeces of the imported animals. To mitigate this problem, shellfish need to be placed in a separate holding tank and their intestinal content purged. For a deeper understanding of the risks associated with transferring contaminated shellfish, oysters ( Crassostrea gigas) and mussels ( Mytilus edulis) were purposely fed either Alexandrium minutum or A. catenella (...
Tipo: Text
Palavras-chave: Risk assessment; Toxic phytoplankton; Uptake; Gut passage; Mytilus edulis; Crassostrea gigas.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-3897.pdf

Absorption et régénération de l'azote dans le système brassé de la Manche : productions nouvelle et régénérée
Provedor de dados: 5
Autores: Maguer, Jf; L'Helguen, S; Madec, C; Le Corre, P.
Nitrate and ammonium uptake rates were measured in spring and summer in deep and shallow well-mixed waters of the English Channel during different cruises between 1986 and 1994. In the deep waters, nitrate uptake was relatively low during phytoplankton development and ammonium uptake represented more than 70 % of the total uptake irrespective of the season. In the shallow waters, nitrate uptake during spring phytoplankton growth was high and represented about 75 % of the total uptake. Ammonium uptake became substantial towards the end of spring and summer. The high contribution of ammonium to the nitrogenous nutrition of phytoplankton over the whole of the well-mixed waters is related to a high rate of recycling of nitrogen in the water column. Ammonium...
Tipo: Text
Palavras-chave: Azote; Absorption; Régénération; Productions nouvelle et régénérée; Manche; Nitrogen; Uptake; Regeneration; New and regenerated productions; English Channel.
Ano: 1998
URL: http://archimer.ifremer.fr/doc/00325/43644/43246.pdf

Iron Uptake by Fungi Isolated from Arcelor Mittal -Annaba- in the Northeast of Algeria
Provedor de dados: 89
Autores: Bourzama,G; Ouled-Haddar,H; Marrouche,M; Aliouat,A.
ABSTRACT The Metal pollution is one of the major risks in the world nowadays. Iron is an essential metal for growth and proliferation of a vast majority of organisms, but it can be toxic to human health and other living beings in the environment at high concentrations due to its increased industrial activity. Fungi have a remarkable capacity to uptake and detoxify iron metal using different mechanisms such as bioaccumulation. Thus, the aim of this work is to study the ability of iron uptake by the fungal strains isolated from Arcelor Mittal -Annaba- in Algeria. Three strains were screened at high concentration of iron (1 g/l) and their capacity to uptake iron has been studied on Czapek Yeast Agar medium. The amounts of uptaken iron ions were estimated in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fungi; Iron; Screening; Toxic; Uptake.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2021000100313

Copper and zinc forms in soil fertilized with pig slurry in the bean crop
Provedor de dados: 91
Autores: Grohskopf,Marco A.; Correa,Juliano C.; Cassol,Paulo C.; Nicoloso,Rodrigo S.; Fernandes,Dirceu M.
ABSTRACT The application of pig slurry may have different influence on copper (Cu) and zinc (Zn) dynamics in the soil compared with mineral fertilization. The aim of this research was to determine the different forms of Cu and Zn in soil and their uptake by bean plants in response to the application of mineral fertilizer and pig slurry (PS). The treatments were: mineral fertilizer (Cu and Zn oxides) and liquid pig slurry, at increasing rates (0/0, 1.7/6.0, 3.4/12.0 and 6.8/24.0 kg ha-1 Cu/Zn, respectively) applied in a Rhodic Kandiudox. PS increased the Cu content in soil in the exchangeable form, Fe oxides and residual, while the mineral fertilizer increased Cu contents in the fraction associated with soil organic matter. Soil Zn contents in the fractions...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Swine slurry; Uptake; Metals fractionation.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016000900823

Chromium uptake from aqueous effluents by immobilized Baker's yeast
Provedor de dados: 59
Autores: Menezes,Lucia Beckmann C.; Braz,Vera Nobre; Cordeiro,Carlos Alberto M.
Baker’s yeast immobilized in alginate was used to take up chromium from effluents. Chromium in aqueous solutions were used in different concentrations. To evaluate the viability and efficiency the baker’s yeast for chromium uptake from effluents three experiments done in two differents reactor systems: first in system 1 at 17.5 ml/s and with 10, 20, 25 and 30 mg/l Cr; second in system 2 at 38.7 ml/s with 20 mg/l Cr; third in system 2.1 at 6.65 ml/s and with 20, 30 and 40 mg/l Cr. The efficiency of chromium uptake varied between 86 and 100 %.
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Baker’s yeast; Chromium; Uptake.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37141998000400003

Mycorrhizal effectiveness and manganese toxicity in soybean as affected by soil type and endophyte
Provedor de dados: 63
Autores: Nogueira,Marco Antonio; Cardoso,Elke Jurandy Bran Nogueira.
Mycorrhizal plants may present Mn toxicity alleviation and this depends on the plant-endophyte-environment interaction. The effectiveness of three arbuscular mycorrhizal fungi (AMF) (Glomus macrocarpum, G. etunicatum, G. intraradices) and a control without AMF in two soils: Typic Rhodudalf with high Mn availability and a Typic Quartzipsamment, with low Mn availability, was evaluated in a time-course experiment at 3, 6, 9 and 12 weeks after soybean (Glycine max L.) seedling emergence. The objective was to select the most effective AMF species to enhance plant growth and to assess its effects upon Mn uptake by plants and Mn availability in the soil. For the sandy soil, AMF inoculation resulted in increased plant biomass, especially with G. intraradices and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mn; Availability; Metal; Mycorrhiza; Toxicity; Uptake.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000200018

Interaction effect between mineral zinc-nitrogen fertilization mixture and organic fertilization as compost on yield, nutrients uptake of rice and some soil properties
Provedor de dados: 111
Autores: Mosaad, Ibrahim S; Khafagy, El-Hosiny E; Seada, Ali K.
To study the effect of organic fertilization as compost (20 m3 fed-1), mineral Zinc-Nitrogen fertilization mixture (three Zinc levels (0, 8 and 16 kg Zn fed-1) and three nitrogen rates (0, 30 and 60 kg N fed-1 were mixed alternately) on growth, grain and straw yields, N, P and K uptake for rice crop (Oryza sativa), variety Giza 178, two field trials at El-Serw Agricultural Research Station, Damietta governorate were conducted through summer seasons of 2015 and 2016. Plant height, dry matter, grain and straw yields also, N, P and K-uptake in grain and straw yields increased with increasing levels of zinc and nitrogen fertilization. Moreover, use organic fertilization as compost gave the highest values of the previous parameters. Applying of 16 kg Zn fed-1 +...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Rice; Zinc; Compost; Organic matter; Uptake; Nitrogen; Fertilization.
Ano: 2018
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/4647

Uptake and nitrogen efficiency in forage maize: effects of nitrogen and plant density
Provedor de dados: 115
Autores: Fallah,S.; Tadayyon,A.
Efficient nitrogen (N) fertilizer management is critical for the economic production of maize (Zea mays L.) and the long-term protection of environmental quality. To study the effects of N doses and plant density on the N uptake and efficiency on forage maize cv. SC 704, an experiment was conducted in the Shahrekord region (32° 21' N, 50° 49' E; altitude 2050 m), Iran, at the Agricultural Research Station of Shahrekord University, during the 2007 growing season. The experiment was arranged with four plant densities (92 600, 104 200, 119 000 and 138 900 plants ha-1) and four nitrogen doses (200, 240, 280 and 320 kg ha-1) in a randomized complete block design with four replications. Increases of the plant density led to a significant N uptake in stalk, grain...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays L.; Density; Efficiency; Fertilization; Uptake.
Ano: 2010
URL: http://www.scielo.org.mx/scielo.php?script=sci_arttext&pid=S1405-31952010000500005

Inhibition of iron and copper uptake by iron, copper and zinc
Provedor de dados: 48
Autores: ARREDONDO,MIGUEL; MARTÍNEZ,RONNY; NÚÑEZ,MARCO T; RUZ,MANUEL; OLIVARES,MANUEL.
Interactions of micronutrients can affect absorption and bioavailability of other nutrients by a number of mechanisms. In aqueous solutions, and at higher uptake levels, competition between elements with similar chemical characteristics and uptake process can take place. The consequences of these interactions may depend on the relative concentrations of the nutrients. In this work, we measure the effects of increasing concentrations of iron, zinc, and copper on iron and copper uptake in Caco-2 cells. Intracellular Fe or Cu levels were affected by incubating with increased concentrations of metals. However, when the cells already had different intracellular metal concentration, the uptake of Fe or Cu was nor affected. In competition studies, we showed that...
Tipo: Journal article
Palavras-chave: Competition; Interaction; Metals; Uptake.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602006000100011

IV.Heat stress in Triticum: kinetics of Fe and Mn accumulation
Provedor de dados: 61
Autores: Dias,Ana S.; Lidon,Fernando C.; Ramalho,José C.
The interactions between Fe/Mn accumulation and the photosynthetic light reactions were investigated in heat stressed bread and durum wheat genotypes (Triticum aestivum L. and Triticum turgidum subsp.durum). Four genotypes were chosen according to its genetic background diversity. Plants were grown in a greenhouse at two different day/night temperatures regimes (control - 25/14ºC and heat stress - 31/20ºC), during the grain filling phase. The contents and uptake/translocation of Fe and Mn were evaluated on booting, grain filling and maturity and correlated with chlorophyll a fluorescence parameters. It was found that, under heat stress, the concentrations of Fe in the culm and leaves diminished in bread wheat, but increased in durum wheat. An opposite...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heat stress; Nutrients; Translocation; Triticum aestivum L.; Triticum turgidum subsp. durum; Uptake.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202009000200008

II. Heat stress in Triticum: kinetics of Cu and Zn accumulation
Provedor de dados: 61
Autores: Dias,Ana S.; Lidon,Fernando C.
The interactions between high temperatures and Cu/Zn accumulation were investigated in bread and durum wheat. Plants were grown in a greenhouse, at two different temperatures regimes (control - 25/14ºC and heat stress - 31/20ºC), and the contents and uptake/translocation of Cu and Zn were evaluated during three developmental stages of plant growth (booting, grain filling and maturity). During grain filling and at maturity it was found that root, shoot and spike concentrations of Cu increased in heat stressed plants of the genotypes Golia and Acalou. The same trend was observed for root and shoot concentrations of Zn in both durum wheat genotypes. It was concluded that plants submitted to high temperatures (during the grain filling period) become more...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Triticum aestivum L.; Triticum turgidum subsp; Durum; Heat stress; Uptake; Nutrients translocation.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202009000200006

Zinc Fertilization Effects on Seed Cadmium Accumulation in Oilseed and Grain Crops Grown on North Dakota Soils
Provedor de dados: 117
Autores: Rojas-Cifuentes,Gonzalo A; Johnson,Burton L; Berti,Marisol T; Norvell,Wendell A.
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Tipo: Journal article
Palavras-chave: Soil series; Seed; Uptake; Nutrients; Contamination.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392012000100019