Consulta: subjectFacets:"Zinc"
Registros recuperados: 68
Data/hora: 02/06/2024 17:10:56

Manejo de hábitat y microorganismos para degradar efluentes industriales: un estudio de caso
Provedor de dados: 67
Autores: Abril,Adriana.
Se evaluó la eficiencia de prácticas de manejo de hábitat y microorganismos para degradar efluentes en una industria metalúrgica de Córdoba, Argentina. Para optimizar la actividad de organismos del agua, el suelo y la rizosfera de las plantas, se manejaron tres hábitats: acuático, de humedales y agrícola. Las prácticas fueron: introducción de vegetación palustre y terrestre, aireación del agua, laboreos, remoción de sedimentos e inoculación con bacterias seleccionadas. Se evaluaron los siguientes parámetros: pH y contenido de bacterias en el agua, y contenido de aceites, Cr y Zn en los sedimentos, suelo y napa freática. El pH registrado fue siempre muy elevado (entre 8.4 y 10.9), mientras que la cantidad de bacterias descomponedoras aumentó hasta valores...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cromo; Zinc; Aceites minerales; Bioremediación; Fitoremediación.
Ano: 2005
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1667-782X2005000100002

Phosphorus and zinc fertilization for cowpea in Amazonia.
Provedor de dados: 14
Autores: RODRIGUES, J. E. L. F.; ARAUJO, S. M. B.; OLIVEIRA, R. P. de; BASTOS, E. A.; RODRIGUES, M. C. S. F.
Fertilização com fósforo (P) pode aumentar a exigência de zinco (Zn) do feijão-caupi para produção de grãos. O objetivo deste estudo foi avaliar os efeitos de doses de P e Zn em cultivares de feijão-caupi em condições de campo na Amazônia. As cultivares foram BRS Imponente e BRS Tumucumaque. Cada cultivar foi estudada separadamente em um experimento de campo. Os experimentos foram fatoriais 4 x 4 em delineamento em blocos ao acaso com três repetições. Os tratamentos em cada experimento foram combinações de doses de P (0 kg/ha, 40 kg/ha, 80 kg/ha e 120 kg/ha de P2O5) e Zn (0 kg/ha, 2 kg/ha, 4 kg/ha e 6 kg/ha de Zn). Aplicação de P aumentou a produtividade de grãos de ambas as cultivares. Resposta à aplicação de Zn foi constatada somente para a cultivar BRS...
Tipo: Folhetos
Palavras-chave: Feijão; Fertilizante; Fósforo; Zinco; Vigna Unguiculata; Cowpeas; Fertilizers; Phosphorus; Zinc; Zinc fertilizers.
Ano: 2022
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1139122

Development of alginate hydrogels active against adhesion of microalgae
Provedor de dados: 5
Autores: Nassif, L. Abi; Rioual, S.; Trepos, Rozenn; Fauchon, M.; Farah, W.; Hellio, C.; Abboud, M.; Lescop, B.
Microorganisms have the ability to settle on nearly all man-made surfaces in contact with seawater and subsequently to form biofilm. Biofilms control and removal is necessary in the sectors of maritime transport, energy... In this work, we present the development of new pure calcium, zinc or copper alginate, but also mixed Ca/Cu and Ca/Zn alginate hydrogels. These materials have been evaluated for their potential inhibition of adhesion of two key biofilm-forming microalgae Halamphora coffeaeformis and Cylindrotheca closterium). All the tested materials have presented high adhesion inhibition about 80%). Copper-base materials present a high toxicity against H. coffeaeformis. Pure zinc alginate is also toxic for this strain. However, the addition of calcium...
Tipo: Text
Palavras-chave: Biofilm; Adhesion; Alginate; Zinc; Biomaterials; Microalgae.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00605/71671/70168.pdf

Construction and use of a dialysis chamber for investigating in situ the toxicity of heavy metals on bacteria.
Provedor de dados: 5
Autores: Tan, T.
Teflon dialysis sampling chambers have been employed to study the toxicity of ZnCl sub(2) on a cadmium-sensitive bacterium, Acinetobacter) CS 13, in an aquarium with running seawater. A concentration of 10 mg Zn super(++) l super(-1) did not influence the cell densities in the chambers, but cell densities decreased at zinc concentrations of 15 and 20 mg l super(-1). In seawater with 20 mg Zn super(++) lu-1 the bacteria accumulated zinc from 827 to 2813 mu g g super(-1) cells dry wt after 1 d. After 2 d the zinc concentration increased to 4625 mu g g super(-1) dry wt. Three chambers were filled with Acinetobacter CS 13 cells added to sterile sediment at a concentration of 1 x 10 super(8) cells ml super(-1) wet sediment. To test the security, these chambers...
Tipo: Text
Palavras-chave: Acinetobacter; Bacteria; Laboratory culture; Tests; Zinc; Dialysis; Toxicity; Heavy metals.
Ano: 1984
URL: http://archimer.ifremer.fr/doc/1984/acte-1012.pdf

Méthode de dosage du cadmium, du cuivre, du plomb et du zinc dans la chair de poissons
Provedor de dados: 5
Autores: Auger, Dominique.
An analytical technique for cadmium, copper, lead and zinc determination in fish tissue used in monitoring programmes is described. Atomic absorption spectrophotometry on nitric digested samples is performed.
Tipo: Text
Palavras-chave: Cadmium; Cuivre; Poisson; Plomb; Zinc; Analyse; Cadmium; Copper; Lead; Zinc; Fish; Determination.
Ano: 1989
URL: https://archimer.ifremer.fr/doc/00489/60059/63343.pdf

Biological and ecological factors related to trace element levels in harbour porpoises (Phocoena phocoena) from European waters
Provedor de dados: 5
Autores: Lahaye, V; Bustamante, Paco; Law, J.r; Learmonth, J.a; Santos, M.b.; Boon, J.p.; Rogan, E; Dabin, W; Addink, M.j.; Lopez, A; Zuur, A.f.; Pierce, G.j.; Caurant, Florence.
Selected trace elements (Cd, Cu, Hg, Se, Zn) were measured in the kidneys and the liver of 104 harbour porpoises (Phocoena phocoena) stranded along the coasts of France, Galicia (Spain), Ireland, Scotland (UK), and the Netherlands. Generally, relatively low concentrations of toxic elements were encountered in the tissues of European porpoises, except for two individuals, which displayed high hepatic Hg concentrations. Also, elevated Cd levels obtained in Scottish porpoises could be related to their feeding preferences and this result suggests an increase of the proportion of cephalopods in their diet with latitude. Moreover, significant geographical differences were seen in hepatic Zn concentrations; the elevated Zn concentrations displayed by porpoises...
Tipo: Text
Palavras-chave: Tracers; Multivariate analysis; Diet; Age; Marine mammals; Zinc; Cadmium; Mercury; Heavy metals.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-2920.pdf

Essential metal contents in indigenous gammarids related to exposure levels at the river basin scale: Metal-dependent models of bioaccumulation and geochemical correlations
Provedor de dados: 5
Autores: Lebrun, Jeremie D.; Uher, Emmanuelle; Tusseau-vuillemin, Marie-helene; Gourlay-france, Catherine.
Biomonitoring, assumed to be an integrative measurement of the chemical exposure of aquatic organisms, is not straightforward for essential metals because they can be actively regulated by animals. Although increasing bioaccumulation with exposure levels is a crucial endpoint for the development of biomonitors, it is rarely verified in real environments, where the metal concentrations are rather low and vary little. This study was designed at the scale of a river basin to assess the ability of Gammarus pulex indigenous populations to accumulate Cu, Zn and Mn in realistic exposure conditions. During two annual campaigns, water and gammarids were collected at various sites contrasted in terms of physicochemistry and contamination. The results show...
Tipo: Text
Palavras-chave: Biomonitor; Metal bioavailability; Gammarus pulex; Copper; Zinc; Manganese.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00180/29154/28656.pdf

Metallothionein: An Overview on its Metal Homeostatic Regulation in Mammals
Provedor de dados: 77
Autores: Sakulsak,Natthiya.
Metallothionein (MT) is a ubiquitous protein with a low molecular weight of 6-7 kDa weight and it was first identified in the kidney cortex of equines as a cadmium (Cd)-binding protein responsible for the natural accumulation of Cd in the tissue. The mammalian MT contains 61 to 68 amino acid residues, in which 18 to 23 cysteine residues are present. The expression of MT starts by binding of metal transcription factor-1 (MTF-1) to the regulative region of MT gene called metal responsive elements (MREs). The induction of MT through the MREs region can be initiated by several metal ions such as zinc (Zn), copper (Cu) and Cd. However, Zn is the only heavy metal which can reversibly and directly activate the DNA-binding activity of MTF-1. In mammals four types...
Tipo: Journal article
Palavras-chave: Metallothionein; Cadmium; Zinc.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000300039

Effects of Zinc During Lactation on the Junctional Epithelium and Inserted Gum in Rats
Provedor de dados: 77
Autores: Felippini,Ana Luiza de Carvalho; Sala,Miguel Angel; Lopes,Ruberval Armando; Silva,Gilberto André e.
The purpose of this study was to evaluate the effects of zinc, during lactation, on the junctional epithelium and inserted gum of the first upper molar of rats. The study used one-day old male rats, divided into two groups: those whose mother had been treated with 300 mg zinc chloride (ZnCl2) in the drinker water (treated group), and those whose mothers did not receive ZnCl2 (control group). After 21 days, the rat pups were sacrificed. Using karyometrical techniques, the greater (D) and smaller (d) nuclear diameters of the different layers of the junctional and inserted gum epithelia were determined, and the mean geometric diameter, D/d ratio, perimeter, area, volume, volume/area ratio, eccentricity, shape coefficient, and the contour index were estimated....
Tipo: Journal article
Palavras-chave: Zinc; Lactation; Junctional epithelium; Inserted gum.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000100024

Effect of zinc on DNA integrity of cumulus cells during oocyte in Vitro maturation
Provedor de dados: 46
Autores: Picco,SJ; Seoane,A; Anchordoquy,JM; Anchordoquy,JP; Rosa,D; Fazzio,LE; Mattioli,GA; Furnus,CC.
Zinc is an essential trace element. It has been known that a non adequate level of zinc can alter not only gene expression but also a variety of cellular functions with severe consequences on animal health. Little is known about the role of zinc on the reproductive performance of bovines, especially in oocyte maturation. The objective of the present study was to evaluate the impact of different zinc concentrations added to culture medium, on the DNA integrity of bovine cumulus cells during in vitro maturation of oocytes. Cumulus-oocyte coplexes obtained from an abattoir were cultured in IVM mediums containing 30 (G1), 70 (G2), 110 (G3) and 150 (G4) &amp;#956;g/dl. At the end of IVM, cumulus cells were processed for Comet Assay. Result obtained with the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zinc; Cumulus cells; Comet assay.
Ano: 2008
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1852-62332008000200004

Etude des polluants chimiques (Cu, Fe, Zn, Cd et Hg) dans les moules (&lt;Perna perna&gt;) prélevées au niveau de la baie du Lévrier.
Provedor de dados: 20
Autores: Dartige, A.Y.
Ce travail a pour objectif de déterminer le niveau de contamination des produits halieutiques mauritaniens. Pour cela, nous avons étudié les polluants chimiques (Cu, Fe, Zn, Cd et Hg) dans des moules (&lt;Perna perna&gt;) prélevées au niveau de la baie du Lévrier en Mauritanie sur une période de quatre mois (novembre 1998 à février 1999). Sur les 400 échantillons analysés les moyennes de concentrations trouvées restent faibles par rapports à celles trouvées dans d'autres zones peu polluées (Amiard et al. 1986b). Ce qui n'est pas le cas du cadmium qui présente des valeurs plus élevées, phénomène fréquemment rencontré le long de la côte ouest africaine (Sidoumou et al. 1992). Par ailleurs, dans cette présente étude il apparaît que les moules de petites...
Tipo: Other
Palavras-chave: Chemical analysis; Copper; Environmental conditions; Iron; Mercury; Size; Zinc; Copper; Iron; Environmental conditions; Mercury; Size; Zinc; Http://aims.fao.org/aos/agrovoc/c_1868; Http://aims.fao.org/aos/agrovoc/c_3950; Http://aims.fao.org/aos/agrovoc/c_32980; Http://aims.fao.org/aos/agrovoc/c_4751; Http://aims.fao.org/aos/agrovoc/c_7093; Http://aims.fao.org/aos/agrovoc/c_8517.
Ano: 1999
URL: http://hdl.handle.net/1834/1225

Effect of improved crop production technology on pigeonpea yield in resource poor rainfed areas
Provedor de dados: 30
Autores: Ramakrishna, A.  Rao, C.S.,( Ch Srinivasa Rao ).
Palavras-chave: Pigeonpeas; Production technology; Rhizobium; Zinc; On-farm research; Sowing rates; Nucleus; Soil analysis; Watersheds; Seed treatment.
Ano: 2005
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/3237

Impact Assessment of Crop and Resource Management Technology: A Case of Groundnut Production Technology
Provedor de dados: 30
Autores: P.K.
Palavras-chave: Technology transfer; Groundnuts; Inorganic acid salts; Nutrient management; Technology; Sprinklers; Gypsum; On-farm research; Pigeonpeas; Zinc.
Ano: 1998
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/4664

Diagnostics of Sorghum and Pearl Millet grains-based nutrition in India
Provedor de dados: 30
Autores: Rao, P.P.
Palavras-chave: Millets; Sorghum; Nutrient intake; Zinc; Cereals; Grain legumes; Proteins; Iron; Nutrients; Vitamins.
Ano: 2006
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/3199

Prospects of breeding for micronutrients and β-carotene-dense sorghums
Provedor de dados: 30
Autores: Reddy, B.V.S.,( Belum V. S. Reddy ).
Palavras-chave: Carotenes; Grain; Organic acid salts; Agronomic characters; Heritability; Germplasm; Phenotypes; Genetic variation; Sorghum; Zinc.
Ano: 2005
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/3256

Solubility and availability of micronutrients extracted from silicate agrominerals
Provedor de dados: 86
Autores: Marchi,Giuliano; Guelfi-Silva,Douglas Ramos; Malaquias,Juaci Vitória; Guilherme,Luiz Roberto Guimarães; Spehar,Carlos Roberto; Martins,Eder de Souza.
Abstract: The objective of this work was to evaluate the solubility of the micronutrients copper, nickel, and zinc, chemically extracted from silicate agrominerals, as alternative sources of potassium for lettuce (Lactuca sativa) and rice (Oryza sativa) cultures, as well as their availability to the plants. The micronutrient contents of five agrominerals (alkaline ultramafic, biotite schist, volcanic breccia, phlogopite schist, and mining by-product from Chapada) were evaluated, after being extracted by the citric acid, hydrochloric acid, diethylenetriaminepentaacetic acid, 3051A, neutral ammonium citrate, and Mehlich-3 methods. The agrominerals, at the doses of 0 (control), 200, 400, and 600 kg ha-1 K, were mixed to soil where lettuce and rice were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Copper; Mining by-product; Nickel; Nutrient availability; Zinc.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2020000100600

A Meta-Analysis of the Impact of Foliar Feeding of Micronutrients on Productivity and Revenue Generation of Forage Crops
Provedor de dados: 87
Autores: IQBAL,M.A.; ABDUL,H.; MUZAMMIL,H.S.; IMTIAZ,H.; TANVEER,A.; SAIRA,I.; ANSER,A.
ABSTRACT: Food security assurance to meet the demands of increased population growth requires a proportional increase in milk and meat production which, in turn, depends on animal nutrition. Assessing foliar application of micronutrients for production of substantive quantities of good quality forage must be a goal of modern, profit-oriented, sustainable agriculture and plants with better competitive ability as compared to weeds. This meta-analysis made a quantitative and qualitative analysis of the impact of foliar feeding of micronutrients (iron, zinc, copper, sulfur and boron) on forage crops under varying pedo-climatic conditions. Weighted and unweighted meta-analyses were performed on 139 studies to evaluate 19 independent variables (9 qualitative, 5...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Economic returns; Plant nutrition; Sprays; Weighted meta-analysis; Zinc.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100245

Effect of Zinc Level and Source (Zinc Oxide Vs. Zinc Glycine) on Bone Mechanical and Geometric Parameters, and Histomorphology in Male Ross 308 Broiler Chicken
Provedor de dados: 89
Autores: Tomaszewska,E; Muszyński,S; Dobrowolski,P; Kwiecień,M; Winiarska-Mieczan,A; Świetlicka,I; Wawrzyniak,A.
ABSTRACT The aim of this study was to evaluate the effect of adding zinc (Zn) mineral supplements from organic (ZnGly) and inorganic (ZnO) sources to growing male Ross 308 chickens on the mechanical, geometric, and histomorphometrical parameters of long bones. A corn-soybean meal basal diet was supplemented with Zn at 50 or 100 mg·kg-1 of a premix, except the control group (0 suppl). The serum concentration of insulin-like growth factor 1 was higher in the ZnGly50 group compared with the control group. Positive influence of Zn on the femur is highlighted when considering the significant increase in parameters such as mean relative wall thickness, and maximum elastic and ultimate strengths after Zn administration. Zinc supplementation did not affect tibial...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bone; Chelate; Chicken; Histomorphometry; Zinc.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2017000100159

Effect of the supplementation of vitamins and organic minerals on the performance of broilers under heat stress
Provedor de dados: 89
Autores: Laganá,C; Ribeiro,AML; Kessler,AM; Kratz,LR; Pinheiro,CC.
The objective of this experiment was to evaluate the effect of diet supplementation with vitamins C and E and organic minerals Zn and Se on the performance of 1 to 35 day-old broilers from, kept under cyclic heat stress (25 to 32ºC). Four levels of vitamin-mineral supplementation were used (T1-control diet (60/30 IU of vit E for starter and growing diet, respectively, zero vit. C, 80 ppm of inorganic Zn, 0.3 ppm of inorganic Se); T2-control diet + 100 UI vit E and 300 ppm vit C/kg; T3-control diet + 40 ppm Zn and 0,3 ppm Se/kg; T4-control diet + T2 and T3 levels) and two environments - thermoneutral and cyclic heat stress (TN and HS) from 14 to 35 days of age. In the period when part of the birds was submitted to HS, from 14 to 35 days, it was observed...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ascorbic acid; Dl-alpha-tocopherol; Selenium; Thermal regulation; Zinc.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2007000100006

Humoral immunological response in broilers vaccinated against newcastle disease and supplemented with dietary zinc and vitamin E
Provedor de dados: 89
Autores: Cardoso,ALSP; Albuquerque,R; Tessari,ENC.
The humoral immune response of broilers fed diets supplemented with Zinc (Zn) (0, 40, and 400mg/kg) and vitamin E (0, 12, and 120mg/kg), separately or combined, was evaluated. A completely randomized design was used according to a 3x3 factorial arrangement, with nine treatments and four repetitions per treatment. Sexed birds (n=1440) were distributed in 36 boxes with 40 chicks each and reared until 41 days of age. Vaccination against Newcastle Disease (ND) was performed when birds were 14 days old. ELISA and HI tests were used to assess antibody levels before vaccination and at 28, 35 and 41 days of age. The results were analyzed using Proc Mixed from SAS. The interaction between the highest dietary levels of Zn and vitamin E resulted in higher antibody...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Broilers; Humoral Immunity; Newcastle Disease; Vitamin E; Zinc.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2006000200005

Comparative Effect of Zinc Concentration and Sources on Growth Performance, Accumulation in Tissues, Tibia Status, Mineral Excretion and Immunity of Broiler Chickens
Provedor de dados: 89
Autores: Azad,SK; Shariatmadari,F; Torshizi,MAK; Chiba,LI.
ABSTRACT This experiment was conducted to investigate the effect of feeding different concentrations and sources of zinc (Zn) on the growth performance, tissue mineral status, bone morphology and immunity responses in 0-4-week broiler chickens. Four hundred and forty 1-d-old broiler chickens were assigned randomly to 11 dietary treatments with 4 cages per treatment and 10 broiler chickens per cage in a completely randomized design. Dietary treatments were: corn-soybean meal basal diet (negative control), basal diet supplemented with 5 g yeast/kg (yeast), and basal diet supplemented with 20, 50, or 80 mg of added Zn/kg as ZnSO4, Zn-Met, or Zn-yeast in a 3 x 3 factorial arrangement of treatments. The results showed that broilers fed Zn supplemented diets had...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Broiler chickens; Growth performance; Bone characteristic; Immunity; Zinc.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2020000200322

Assessment of micronutrient extractants from soils of Paraná, Brazil
Provedor de dados: 90
Autores: Sarto,Marcos Vinicius Mansano; Steiner,Fábio; Lana,Maria do Carmo.
In Brazil, plant-available micronutrients in the soil can be determined by several chemical extractants, the most common of which are dilute acid and chelating solutions. The purpose of this study was to assess the extractants 0.1 mol L-1 HCl, Mehlich-1, Mehlich-3 and DTPA for analysis of the micronutrients Cu, Zn, Fe, and Mn in soils from the state of Paraná. In samples from 12 soils (0-20 cm layer), wheat was planted (Triticum aestivum), grown for 42 days after emergence, and then bean (Phaseolus vulgaris) for 38 days. At the end of each planting period, the soil was sampled again. All extractants tested to assess the availability of Cu, Zn, Fe, and Mn correlated with each other. The efficiency of the extractants HCl, Mehlich-3 and DTPA in assessing...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil analysis; Correlation; Copper; Zinc; Iron; Manganese.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832011000600024

Arbuscular mycorrhizal fungi and auxin associated with microelements in the development of cuttings of Varronia leucocephala
Provedor de dados: 91
Autores: Fernandes,Mônica D. S. da S.; Morais,Marciana B. de; Mesquita-Oliveira,Francisco F.; Ulisses,Cláudia; Medeiros,José F. de; Albuquerque,Cynthia C. de.
ABSTRACT The plant Varronia leucocephala is widely used in Brazil for its therapeutic properties. However, a major problem for the seedlings is the low percentage of root formation. The objective of this study was to establish a rooting protocol for V. leucocephala cuttings, using phytoregulators and microelements associated with arbuscular mycorrhizal fungi. The auxin indole-3-butyric acid (IBA) concentration of 1500 mg L-1 showed the best rooting percentage, and it is proposed associating the microelements zinc and boron with the highest IBA doses. Although an increase in the rooting percentage was observed in the presence of zinc, it was not the most suitable for improving the percentage of propagation. Consequently, association of arbuscular...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Boron; Rooting; Zinc.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662019000300167

The effects of heavy metals on the incidence of morphological deformities in Chironomidae (Diptera)
Provedor de dados: 103
Autores: Deliberalli,Wanessa; Cansian,Rogério L.; Pereira,Albanin A. M.; Loureiro,Rafael C.; Hepp,Luiz U.; Restello,Rozane M.
ABSTRACT Streams in urban areas are strongly impacted by the input of organic matter and metals, for instance copper (Cu) and zinc (Zn). These metals are essential for the aquatic biota, but when absorbed in excess they are toxic. In Chiro nomidae larvae, the deleterious effects of heavy metals can be ascertained by analyzing the morphological deformities of the larval mentum, a structure of the oral cavity. In this study, we evaluated I) the bioavailability of Cu and Zn in urban stream sediments and II) the relationship between Cu and Zn concentrations and the incidence of deformities in the mentum of Chironomus larvae. Chironomid flies were collected from four locations in two streams at an urban area in southern Brazil. They were identified and the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biomonitoring; Copper; Environmental quality; Mentum; Zinc.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702018000100316

Trace mineral requirements for growth of Moxotó goats grazing in the semiarid region of Brazil
Provedor de dados: 96
Autores: Araújo,Marcos Jácome de; Medeiros,Ariosvaldo Nunes de; Teixeira,Izabelle Auxiliadora Molina de Almeida; Costa,Roberto Germano; Marques,Carlo Aldrovandi Torreão; Resende,Kléber Tomás de; Melo,Gabriel Maurício Peruca de.
ABSTRACT A comparative slaughter trial was conducted to estimate the body composition and net requirements of Cu, Zn, Mn, Fe, and Co for growth of castrated Moxotó goat kids, with15.69±0.78 kg initial body weight (BW), grazing in the semiarid region of Brazil. The baseline group consisted of four randomly selected kids (15.37±0.30 kg BW). Thirty-two kids were randomly allocated into eight groups (considered as block), distributed among four levels of concentrate supplementation (0, 0.5, 1.0, and 1.5% BW). Animals in a group were slaughtered when the 1.5% BW treatment kids in the group reached approximately 25 kg BW. The trace element content (mg/kg of empty body weight) ranged from 23.68 to 27.81 mg Zn, 35.70 to 47.29 mg Fe, 0.86 to 1.09 mg Mn, 1.45 to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Caatinga; Factorial method; Micro mineral; Zinc.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982017000300231

Digestible lysine and organic zinc for male broiler from 1 to 11 days of age: performance and body composition
Provedor de dados: 96
Autores: Trindade Neto,Messias Alves da; Namazu,Lilian Bernadete; Kobashigawa,Estela; Takeara,Paula; Donato,Daniella Carolina Zanardo; Albuquerque,Ricardo de.
This study evaluated levels of digestible lysine and organic zinc for male Ross strain broilers from 1 to 11 days of age. It was used 1,050 chicks distributed in randomized block design, in 5 × 2 factorial scheme, with seven repetitions of 15 birds per experimental unit. The dietary concentrations of digestible lysine were 0.90; 1.00; 1.10; 1.20; and 1.40% combined with 43 and 253 ppm zinc chelate. The diets contained 2,965 ± 18 kcal/kg of apparent metabolizable energy (AME) and 21.48 ± 0.18% of CP. It was determined chemical composition, protein, lipid, mineral and water depositions on carcass and empty body. There was no interaction among the factors digestible lysine and organic zinc. Effect of zinc concentration increase was observed on greatest...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amino acid; Nutrient deposition; Nutrition; Requirement; Zinc.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982011000300019

Carcass characteristics and meat evaluation of Nelore cattle subjected to different antioxidant treatments
Provedor de dados: 96
Autores: Carmo,Thiago de Jesus do; Peripolli,Vanessa; Costa Jr,João Batista Gonçalves; Tanure,Candice Bergmann; Fioravanti,Maria Clorinda Soares; Restle,João; Kindlein,Liris; McManus,Concepta.
ABSTRACT Forty Nelore cattle were used to evaluate the effects of supplementation with different antioxidants on carcass characteristics and meat quality of feedlot cattle. Animals were fed Brachiaria brizantha hay and subjected to five treatments (control and four antioxidants: zinc, selenium, vitamin E, and selenium + vitamin E). After a 105-day feeding period, cattle were slaughtered. Tissue composition, as well as carcass proximate composition, color, tenderness, pH, and fatty acid profile were evaluated. Analysis of variance was carried out and means compared by Tukey test at 0.05 probability. The group fed selenium showed the lowest muscle amount (66.61 g/100 g) compared with the other antioxidants evaluated. There was no difference among treatments...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fatty acid; Saponin; Selenium; Vitamin E; Zinc.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982017000200138

Nitrogen fixation and growth response of Alnus rubra amended with low and high metal content biosolids
Provedor de dados: 63
Autores: Gaulke,Linda S.; Henry,Charles L.; Brown,Sally L.
Forest application of biosolids offers a potential environmentally friendly alternative to landfilling. This two-year investigation was designed to analyze the effects of elevated soil metal concentration resulting from the land application of biosolids on the symbiotic, nitrogen (N) fixing relationship between Alnus rubra Bong. (red alder) and Frankia. High metal biosolids and a modern-day composted biosolid applied at high loading rates of 250, 500, and 1000 Mg ha-1, were used to represent a worst-case scenario for metal contamination. The high metal biosolids were obtained before the current regulations were formulated and had been lagooned prior to use in this study. Total cadmium (Cd), lead (Pb) and zinc (Zn) in the high metal biosolids were 45, 958,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Frankia; Cadmium; Lead; Zinc.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000400006

Assessment of heavy metals in soils of a vineyard region with the use of principal component analysis
Provedor de dados: 63
Autores: Valladares,Gustavo Souza; Camargo,Otávio Antônio de; Carvalho,José Ruy Porto de; Silva,Alessandra Maria Cia.
Agricultural management with chemicals may contaminate the soil with heavy metals. The objective of this study was to apply Principal Component Analysis and geoprocessing techniques to identify the origin of the metals Cu, Fe, Mn, Zn, Ni, Pb, Cr and Cd as potential contaminants of agricultural soils. The study was developed in an area of vineyard cultivation in the State of São Paulo, Brazil. Soil samples were collected and GPS located under different uses and coverings. The metal concentrations in the soils were determined using the DTPA method. The Cu and Zn content was considered high in most of the samples, and was larger in the areas cultivated with vineyards that had been under the application of fungicides for several decades. The concentrations of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: PCA; GIS; Soil pollution; Copper; Zinc.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000300011

การตอบสนองของอ้อยที่ปลูกในดินเนื้อหยาบต่อการใส่มูลไก่และการให้ปุ๋ยสังกะสีกับเหล็กทางใบ
Provedor de dados: 106
Autores: Radchanee Khumdech; Suphicha Thanachit; Somchai Anusontpornperm; Anchalee Suddhiprakarn.
Growing sugarcane (K95-84) on coarse-textured, Satuk soil (Typic Paleustult) in farmer’s field of Sikhiu district, Nakhon Ratchasima province, was aimed at examining the effect of rice husk-mixed chicken manure and Zn, Fe foliar application on cane yield and nutrient concentration in leaf of the plant. The experimental design was 2 x 6 factorial in randomized complete block with four replications, comprising two factors as follow; 1) no manure and rice-husk-mixed chicken manure application (1000 kg/rai) and 2) no foliar application, Zn foliar application (3 kg/rai) once, twice, and three times, Zn+Fe application (3 and 0.8 kg/rai, respectively) once, and twice.This application was conducted at two-, three- and four-month after planting. All plots were...
Tipo: Collection
Palavras-chave: Sugarcane; Coarse-textured soil; Zinc; Chicken manure; อ้อย; มูลไก่; ปุ๋ยสังกะสี; ปุ๋ยเหล็ก; การให้ปุ๋ยทางใบ; ดินเนื้อหยาบ; ผลผลิต; ความเข้มข้นของธาตุอาหารในใบ.
Ano: 2011
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5192

Application of zinc to corn grown in calcareous soils
Provedor de dados: 106
Autores: Suwapan Ratanarat; Withaya Marsangsan; Tienchai Arayangkoon; Yupin Boon-ampol; Supaporn Ratanarat; Samnao Phetchawee.
4 tables
Palavras-chave: Corn; Maize; Zinc; Phosphate fertilizers; Fertilizers; Calcareous soil; Yields; ข้าวโพด; สังกะสี; หินปูน; อัตราการเจริญเติบโต.
Ano: 1980
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/4024

ธาตุสังกะสีในเมล็ดข้าวพันธุ์พื้นเมืองภาคใต้
Provedor de dados: 106
Autores: Nantiya Panomjan; Chanakan Promuthai; Sansanee Jamjod; Benjavan Rerkasem.
Variation in zinc (Zn) concentration in the grain of 50 local rice varieties from Southern Thailand was examined by diphenyl thiocarbazone (DTZ) staining (intense, medium, low, and nil) and chemical analysis. Intense staining was found in the aleurone layer of 94% of the varieties, in the embryo 56% of the varieties and endosperm 12% of the varieties. Variation was found in the DTZ staining intensity of the embryo and endosperm of individual grains, with Shannon-weaver diversity index (H) of the DTZ staining at 0.15-1.00 for the embryo and 0.00-1.00 for the endosperm. Chemical analysis found the Zn concentration in brown rice grain ranging between 18-34 mg Zn/kg, 7 varieties were considered high grain Zn (29-34 mg Zn/kg). The Zn concentration in the husk...
Tipo: PhysicalObject
Palavras-chave: Staining; Local rice; Endosperm; Grain; Zinc; ข้าวพื้นเมือง; อาหารสะสมในเมล็ด; เมล็ดข้าว; สังกะสี; ภาคใต้.
Ano: 2012
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5403

EFECTO DE UN QUELANTE DE ZINC EXTRACELULAR SOBRE EL NÚMERO DE CÉLULAS GANGLIONARES EN RETINA DE RATA, Y TRANSPORTADORES DE TAURINA Y DE ZINC EN ESTAS CÉLULAS
Provedor de dados: 37
Autores: MÁRQUEZ GARCÍA,Asarí; SALAZAR,Víctor; LIMA,Lucimey.
RESUMEN La deficiencia de zinc en humanos produce disminución de antioxidantes, asociados a taurina, en la retina y se relaciona con adaptación anormal a la oscuridad, cataratas, ceguera y degeneración macular. Existe escasa evidencia acerca del efecto del zinc sobre el sistema de taurina en retina de mamíferos, por lo cual estudiamos el efecto del zinc sobre el transportador de taurina (TAUT) y los transportadores de zinc (ZnT-1 y 3) usando el quelante de zinc extracelular, ácido dietileno-triamino-penta-acético (DTPA), mediante inmunocitoquímica e inmunohistoquímica fluorescentes en células ganglionares (CG) y en las capas de la retina de ratas. Tres días después de la administración de DTPA (10μM) se utilizaron anticuerpos primarios y secundarios...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Retina; Taurina; Transportador de taurina; Transportadores de zinc; Zinc.
Ano: 2017
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-548X2017000200002

Zinc y cobre séricos y la relación zinc/cobre en un grupo de niños del sur de Valencia, Venezuela
Provedor de dados: 38
Autores: Acosta García,Edgar; Galdona,Elissa; Barón,María Adela; Páez,María Concepción; Velásquez,Emma; Solano,Liseti.
Se estudiaron las concentraciones séricas de zinc (Zn) y cobre (Cu), y la relación zinc/cobre (Zn/Cu) en 82 niños aparentemente sanos de 4 a 14 años de la ciudad de Valencia, Venezuela. Las concentraciones de Zn y Cu se determinaron por espectrofotometría de absorción atómica y el estado nutricional con los índices Peso/Talla, Talla/Edad e Índice de Masa Corporal. Los resultados de Zn (&amp;#956;g/dL), Cu (&amp;#956;g/dL) y la relación Zn/Cu fueron expresados en media±desviación estándar: (84,2±15,9), (125,4±24,8) y (0,69±0,18) respectivamente, sin diferencia significativa entre niños y niñas. La concentración de Cu correlacionó significativamente con la edad, siendo más baja en los niños mayores. La hipozincemia fue de 15,9% siendo las niñas (18,6%) más...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zinc; Cobre; Relación Zn/Cu; Niños.
Ano: 2010
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0325-29572010000100004

Valores de referencia de cobre, zinc y selenio en niños
Provedor de dados: 38
Autores: Feliu,María Susana; Piñeiro,Adriana; López,Clara; Slobodianik,Nora Haydée.
Desde el punto de vista nutricional es necesario conocer la concentración sérica de algunos minerales en niños y para poder interpretar los resultados es imprescindible comparar con valores de referencia. El objetivo de este trabajo es determinar valores de referencia de cobre, zinc y selenio en suero de niños. Se utilizaron muestras de suero de niños de ambos sexos (n = 42) clínicamente sanos, elegidos al azar, entre 1 mes y 12 años de edad, concurrentes para control al Servicio de Pediatría del Hospital de Clínicas "José de San Martín", Ciudad Autónoma de Buenos Aires. Los niveles de zinc (Zn), cobre (Cu) y selenio (Se) se determinaron en suero libre de hemólisis por espectrofotometría de absorción atómica. Los resultados fueron: cobre: 0,78 - 2,51...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cobre; Zinc; Selenio; Valores de referencia; Niños.
Ano: 2005
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0325-29572005000400007

Zinc, cobre y vitaminas C, E y A en púberes con exceso de peso y resistencia a la insulina
Provedor de dados: 38
Autores: Acosta García,Edgar; Carías,Diamela; Páez Valery,María; Naddaf,Gloria; Domínguez,Zury.
Las vitaminas (Vit.) C, E y A, junto al zinc (Zn++) y cobre (Cu++) colaboran en la prevención de las comorbilidades asociadas a la obesidad. El objetivo del trabajo fue evaluar las concentraciones séricas (Cs) de Vit. C, E y A, así como las del Zn++ y Cu++ en púberes con exceso de peso (EP) y resistencia a la insulina (RI). El estudio fue descriptivo, correlacional, de campo y transversal. Las variables se compararon entre los púberes normopeso (NP)/sin RI y quienes tenían EP (con y sin RI). Se emplearon las pruebas de Pearson y Spearman, test de Student, U de Mann-Whitney, Kruskal-Wallis y el estadístico Z. Los adolescentes con EP/RI presentaron Cs de Zn++ menores que aquellos con EP/sin RI, y que el grupo control (p=0,010), siendo probablemente la RI lo...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vitaminas antioxidantes; Zinc; Cobre; Exceso de peso; Resistencia a la insulina; Adolescentes.
Ano: 2017
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0325-29572017000200005

Validación de la determinación de manganeso, molibdeno y zinc por plasma de acoplamiento inductivo
Provedor de dados: 38
Autores: Sara Farías,Silvia; Menéndez,Ana María; Pontiggia,Rodrigo Martín; Servant,Roberto Enrique; Cortez,Iris; Pita Martín de Portela,María Luz.
Se describe la validación de un método para la determinación de manganeso, molibdeno y zinc, a niveles traza, en soluciones acuosas, mediante espectroscopia de emisión-plasma inductivo de argón. Se optimizó y validó la cuantificación de manganeso, molibdeno y zinc en solución acuosa ácida usando un espectrómetro de emisión atómica de plasma inductivo. Se determinaron: selectividad/especificidad, linealidad, repetibilidad y precisión intermedia utilizando materiales de referencia, y sesgo contrastando contra material de referencia certificado de matriz. Las longitudes de onda (nm) seleccionadas fueron: Zn 213.857, Mn 257.610 y Mo 202.031, las cuales permitieron discriminar interferencias espectrales. Se probó la linealidad de las funciones respuesta...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Validación; Manganeso; Molibdeno; Zinc; Plasma de acoplamiento inductivo.
Ano: 2016
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0325-29572016000400011

Proteína C reactiva, cobre y zinc séricos en un grupo de pacientes pediátricos críticos
Provedor de dados: 38
Autores: Feliu,María Susana; Vidueiros,Silvina Mariela; Piñeiro,Adriana; López,Clara; Slobodianik,Nora Haydée.
Se estudiaron 19 niños entre 1 y 36 meses de vida, internados en la Unidad de Cuidados Intensivos Pediátricos (UCIP) del Hospital "Dr. Pedro de Elizalde". Las muestras de sangre fueron extraídas en ayunas, al ingreso en UCIP. Se determinó la concentración de proteína C reactiva (PCR) -por inmunodifusión radial cuantitativa-, cobre (Cu) y zinc (Zn) -por absorción atómica-, calculándose la relación Cu/Zn. Como valores de referencia (VR) se utilizaron los reportados por la bibliografía para el mismo grupo etario. Los resultados expresados como rangos fueron: PCR: 0,2-7,0 mg/dL; Cu: 0,4-2,2 µg/mL; Zn: 0,3-2,7 µg/mL; Cu/Zn: 0,3-2,1. VR: PCR: &lt; 0,8 mg /dL; Cu: 0,8-1,5 µg/mL; Zn: 0,65-1,4 µg/mL; Cu/Zn &lt; 1. Los hallazgos preliminares muestran que el 63% de...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cobre; Zinc; Proteína C reactiva; Niños; Estado nutricional.
Ano: 2006
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0325-29572006000200011

Cobertura do solo, produção de biomassa e teores de  Mn e Zn  de alface no sistema orgânico - DOI: 10.4025/actasciagron.v31i4.691
Provedor de dados: 1
Autores: Mógor, Átila Francisco; UFPR; Câmara, Francisco Luiz Araújo; UNESP.
O objetivo desse trabalho foi avaliar o efeito da cobertura do solo com aveia preta e manutenção da palha sobre o terreno, bem como cobertura do solo com filme de polietileno preto, sobre a produção de biomassa e teores de Mn e Zn, em alface cultivada no sistema orgânico, por dois anos consecutivos. Utilizaram-se cinco tratamentos: solo sem cobertura, coberto com filme de polietileno preto, coberto com aveia deitada, coberto com aveia ceifada e solo coberto com aveia na sua forma natural, para o cultivo de três cultivares de alface. O experimento seguiu delineamento experimental de blocos ao acaso, com quatro repetições e análise estatística com parcelas subdivididas. Concluiu-se que o cultivo de alface em sucessão à aveia preta, sobre a palha, promoveu...
Palavras-chave: 5.01.03.04-0    Produção de Mudas Lactuca sativa L.; Sistema orgânico; Manganês; Zinco; Solo coberto; Avena strigosa 5.01.03.00-8 Lactuca sativa L.; Organic production; Manganese; Zinc; Covered soil; Avena strigosa.
Ano: 2009
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/691

Effect of liming on micronutrient availability to soybean grown in soil under different lengths of time under no tillage
Provedor de dados: 1
Autores: Moreira, Silvino Guimarães; Prochnow, Luís Ignácio; Pauletti, Volnei; Silva, Bruno Montoani; Kiehl, Jorge de Castro; Silva, Carine Gregório Machado.
The effect of liming on the availability of micronutrients to soybean cultivated during different numbers of years under no tillage (NT) was investigated. The treatments consisted of the number of years under NT (three, six, and nine years) and five rates of lime (0, 33, 67 and 100% of the amount calculated to raise soil base saturation to 70%) broadcast on soil surface plus the rate of 100% broadcast with incorporation in the 0-0.20 m layer of a clayey Red Oxisol. Soil and leaf samples were collected at two vegetative stages of the crop (vegetative V4 and blossoming R2). The soil was sampled at depths of 0-0.05, 0.05-0.10, 0.10-0.20, and 0.20-0.30 m. Surface liming had little effect on extractable soil micronutrient and nutrient concentrations in soybean...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Copper; Iron; Manganese; Zinc; No till Fertilidade do solo.
Ano: 2017
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/30691

Exigência líquida de zinco, cobre e ferro para cordeiros em pastejo no semiárido - doi: 10.4025/actascianimsci.v32i3.5883
Provedor de dados: 2
Autores: Mendes, Rodrigo de Souza; UFCG; Silva, Aderbal Marcos de Azevêdo; UFCG; Silva, Guilherme de Lira Sobral; UFCG; Nóbrega, Giovanna Henriques da; UFCG; Lôbo, Katiuscia Menezes; UFCG; Pereira Filho, José Morais; UFCG.
Este trabalho teve por objetivo determinar as exigências líquidas de zinco (Zn), cobre (Cu) e ferro (Fe) de cordeiros Santa Inês em pastejo na região semiárida. Os animais com peso vivo entre 20 e 30 kg apresentaram conteúdo corporal no peso de corpo vazio (PCV) para esses minerais de 60,26 a 76,37 mg kg-1, 10,78 a 16,72 mg kg-1 e 133,44 a 126,98 mg kg-1, respectivamente. Observou-se que com o aumento do PCV, as concentrações de Cu e Zn também aumentavam, enquanto a de Fe diminuía. As exigências líquidas para cordeiros em regime de pastejo variaram de 1,69 a 7,86 mg dia-1 para Cu e 7,20 a 27,4 mg dia-1 para Zn. Os resultados obtidos no presente trabalho, para exigências desses minerais, foram maiores do que as exigências dietéticas recomendadas pelo do NRC...
Tipo: Pesquisa de campo
Palavras-chave: Zootecnia composição corporal; Exigências nutricionais; Ferro; Cobre; Zinco; Exigências dietéticas Zootecnia body composition; Nutritional requirements; Iron; Copper; Zinc; Dietary requirements.
Ano: 2010
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/5883

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

Azospirillum lipoferum and nitrogen fertilization effect on chlorophyll content, nutrients uptake and biometric properties of Zea mays L.
Provedor de dados: 115
Autores: Davaran-Hagh,Elnaz; Mirshekari,Bahram; Reza-Ardakani,Mohammad; Farahvash,Farhad; Rejali,Farhad.
Integrated nutrient management is a major agronomic practice which brings together all methods to support plants nutritional requirement. However, the interaction of these methods together is very complex and needs to be studied in different climatic conditions. So, the effect of nitrogen fertilizer and Azospirillum lipoferum inoculation on maize (Zea mays L.) growth, yield and nutrients uptake was determined in this study. The hypothesis was that the bacterial inoculation decreases the need for N fertilizer application without reducing plant yield. Therefore, we carried out a factorial experiment in a randomized complete block design with three replications. Nitrogen at 0, 25, 50, 75 and 100 % concentrations of the recommended dose, i.e. 150 kg N ha-1...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biofertilizer; Iron; Nitrogen; Phosphorus; Zinc.
Ano: 2015
URL: http://www.scielo.org.mx/scielo.php?script=sci_arttext&pid=S1405-31952015000800006

Conformational analysis of Pneumococcal Surface Antigen A (PsaA) upon zinc binding by fluorescence spectroscopy
Provedor de dados: 42
Autores: Bom,Ana Paula D. Ano; Corrêa,Izabella B.S.; Argondizzo,Ana Paula C.; Medeiros,Marco Alberto; Santos,Roger B. dos; Souza,Theo Luiz F. de; Silva Junior,José G. da.
ABSTRACT PsaA (pneumococcal surface antigen A) is a S. pneumoniae virulence factor that belongs to the metal transport system. The Manganese PsaA binding has been associated with oxidative stress resistance becoming a pivotal element in the bacteria virulence. It has been shown that Zinc inhibits the Manganese acquisition and promotes bacteria toxicity. We have performed a PsaA conformational analysis both in the presence (Zn-rPsaA) and in the absence of Zinc (free-rPsaA). We performed experiments in the presence of different Zinc concentrations to determine the metal minimum concentration which induced a conformational change. The protein in free and Zn-binding condition was also studied in pH ranging 2.6-8.0 and in temperature ranging 25oC-85oC. pH...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Conformational analysis; RPsaA; Zinc; Stability; Streptococcus Pneumoniae.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000502299

Associative diazotrophic bacteria in grass roots and soils from heavy metal contaminated sites
Provedor de dados: 42
Autores: Moreira,Fátima M.S.; Lange,Anderson; Klauberg-Filho,Osmar; Siqueira,José O.; Nóbrega,Rafaela S.A.; Lima,Adriana S.
This work aimed to evaluate density of associative diazotrophic bacteria populations in soil and grass root samples from heavy metal contaminated sites, and to characterize isolates from these populations, both, phenotypically (Zinc, Cadmium and NaCl tolerance in vitro, and protein profiles) and genotypically (16S rDNA sequencing), as compared to type strains of known diazotrophic species. Densities were evaluated by using NFb, Fam and JNFb media, commonly used for enrichment cultures of diazotrophic bacteria. Bacterial densities found in soil and grass root samples from contaminated sites were similar to those reported for agricultural soils. Azospirillum spp. isolates from contaminated sites and type strains from non-contaminated sites varied...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Azospirillum; Zinc; Cadmium; Soil contaminants; Nitrogen-fixing bacteria.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000400014

The lizard cerebral cortex as a model to study neuronal regeneration
Provedor de dados: 42
Autores: LOPEZ-GARCIA,CARLOS; MOLOWNY,ASUNCION; NACHER,JUAN; PONSODA,XAVIER; SANCHO-BIELSA,FRANCISCO; ALONSO-LLOSA,GREGORI.
The medial cerebral cortex of lizards, an area homologous to the hippocampal fascia dentata, shows delayed postnatal neurogenesis, i.e., cells in the medial cortex ependyma proliferate and give rise to immature neurons, which migrate to the cell layer. There, recruited neurons differentiate and give rise to zinc containing axons directed to the rest of cortical areas, thus resulting in a continuous growth of the medial cortex and its zinc-enriched axonal projection. This happens along the lizard life span, even in adult lizards, thus allowing one of their most important characteristics: neuronal regeneration. Experiments in our laboratory have shown that chemical lesion of the medial cortex (affecting up to 95% of its neurons) results in a cascade of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Medial cortex; Hippocampus; Postnatal neurogenesis; Neural stem cells; Zinc; Regeneration.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000100006

Uptake and translocation of Cd and Zn in two lettuce cultivars
Provedor de dados: 42
Autores: FONTES,RENILDES L.F.; PEREIRA,JULIANA M.N.; NEVES,JULIO C.L.
Excess of heavy metals in agricultural soils is a matter of concern since it may decrease economic yield as a result of toxicity and lower product quality as a result of metal accumulation in edible plant parts. Among plant species and among cultivars within species a natural variation in uptake, translocation and distribution of trace elements occur. The transference of Cd and Zn, from soil to two lettuce (Lactuca sativa L.) cultivars grown in greenhouse, was evaluated in separate experiments for Cd and Zn.Plant dry and fresh matter yield and plant Cd and Zn concentrations were determined. Cultivar CRV showed greater potential for yield than CMM in both experiments. Cadmium and Zn translocation from roots to shoots increased with the increase of soil Cd...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cadmium; Food quality; Lettuce; Plant nutrition; Soil; Zinc.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000200907

Zinc in the prevention of Fe2initiated lipid and protein oxidation
Provedor de dados: 48
Autores: ZAGO,M. PAOLA; VERSTRAETEN,SANDRA V.; OTEIZA,PATRICIA I.
In the present study we characterized the capacity of zinc to protect lipids and proteins from Fe2+-initiated oxidative damage. The effects of zinc on lipid oxidation were investigated in liposomes composed of brain phosphatidylcholine (PC) and phosphatidylserine (PS) at a molar relationship of 60:40 (PC:PS, 60:40). Lipid oxidation was evaluated as the oxidation of cis-parinaric acid or as the formation of 2-thiobarbituric acid-reactive substances (TBARS). Zinc protected liposomes from Fe2+ (2.5-50 muM)-supported lipid oxidation. However, zinc (50 muM) did not prevent the oxidative inactivation of glutamine synthelase and glucose 6-phosphate dehydrogenase when rat brain superntants were oxidized in the presence of 5 muM Fe2+ and 0.5 mM H2O2 .We also...
Tipo: Journal article
Palavras-chave: Aluminum; Catechins; Free radicals; Iron; Lipid peroxidation; Zinc.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602000000200014

Effectiveness of zinc in modulating perinatal effects of arsenic on the teratological effects in mice offspring
Provedor de dados: 48
Autores: Ahmad,Mohammad; Wadaa,Mohammad A. M; Farooq,Muhammad; Daghestani,Maha H; Sami,Ahmed S.
Exposure to arsenic via drinking water is considered as a worldwide problem. Studies have shown that arsenic exposure during pregnancy affects embryogenesis and offspring development in rats and mice. Zinc as a micronutrient regulates many physiological functions, including an antioxidative role under various toxic conditions. However, studies on the perinatal protective effect of zinc on offspring need further attention. The present study was designed to evaluate the potential protective role of zinc in mitigating the adverse effects in the offspring of arsenic exposure during pregnancy. The arsenic (40mg/kg body weight) and zinc (4% w/v) doses formed the only drinking fluid source for the experimental groups of dams during the perinatal period of the...
Tipo: Journal article
Palavras-chave: Arsenic; Zinc; Perinatal; Mice offspring; Sensory motor reflexes; Behavior; Oxidative stress.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602013000200003

Activation of group II metabotropic glutamate receptors blocks zinc release from hippocampal mossy fibers
Provedor de dados: 48
Autores: Matias,Carlos M; Dionísio,Jose C; Saggau,Peter; Quinta-Ferreira,Maria Emilia.
BACKGROUND: The hippocampal CA3 area contains large amounts of vesicular zinc in the mossy fiber terminals which is released during synaptic activity, depending on presynaptic calcium. Another characteristic of these synapses is the presynaptic localization of high concentrations of group II metabotropic glutamate receptors, specifically activated by DCG-IV. Previous work has shown that DCG-IV affects only mossy fiber-evoked responses but not the signals from associational-commissural afferents, blocking mossy fiber synaptic transmission. Since zinc is released from mossy fibers even for single stimuli and it is generally assumed to be co-released with glutamate, the aim of the work was to investigate the effect of DCG-IV on mossy fiber zinc signals....
Tipo: Journal article
Palavras-chave: Zinc; Neurotransmission; Glutamatergic; Co-release; Metabotropic fluorescence; Inhibition.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602014000100067

Divalent cations as modulators of neuronal excitability: Emphasis on copper and zinc
Provedor de dados: 48
Autores: DELGADO,RICARDO; VERGARA,CECILIA; WOLFF,DANIEL.
Based on indirect evidence, a role for synaptically released copper and zinc as modulators of neuronal activity has been proposed. To test this proposal directly, we studied the effect of copper, zinc, and other divalent cations on voltage-dependent currents in dissociated toad olfactory neurons and on their firing rate induced by small depolarizing currents. Divalent cations in the nanomolar range sped up the activation kinetics and increased the amplitude of the inward sodium current. In the micromolar range, they caused a dose dependent inhibition of the inward Na+ and Ca2+ currents (I Na and I Ca) and reduced de amplitude of the Ca2+-dependent K+ outward current (I Ca-K). On the other hand, the firing rate of olfactory neurons increased when exposed to...
Tipo: Journal article
Palavras-chave: Copper; Zinc; Modulators; Channels; Neuronal excitability.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602006000100019

Geobacillus stearothermophilus LV cadA gene mediates resistance to cadmium, lead and zinc in zntA mutants of Salmonella entérica serovar Typhimurium
Provedor de dados: 48
Autores: PÉREZ,JOSÉ M; PRADEÑAS,GONZALO A; NAVARRO,CLAUDIO A; HENRÍQUEZ,DANIEL R; PICHUANTES,SERGIO E; VÁSQUEZ,CLAUDIO C.
Salmonella entérica serovar Typhimurium cells expressing the cadA gene of Geobacillus stearothermophilus LV exhibit a hypersensitive phenotype to cadmium chloride. Deletion of the ORF STM3576 from the Salmonella genome resulted in cadmium, lead and zinc sensitivity, confirming that this ORF is a homologue of the zntA gene. The observed sensitivity was reverted upon expression of the G. stearothermophilus LV cadA gene. These results indicate that the cadA gene product is involved in Cd, Pb and Zn resistance as a classical P-type ATPase and strongly suggest that the observed hypersensitive phenotype to these metals can be related to the function of the host ·zntA gene product
Tipo: Journal article
Palavras-chave: CadA; Cadmium; Lead; P-type ATPase; Zinc; ZntA.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602006000500009

Crambe affected by biological and chemical seed treatments
Provedor de dados: 53
Autores: Cattanêo,Alex Júnior; Stangarlin,José Renato; Bassegio,Doglas; Santos,Reginado Ferreira.
ABSTRACT Crambe has great potential for cultivation in tropical regions, but its biotic factors may be a limiting aspect for its production. Thus, we aimed in this study to assess the effect of pre‐sowing seed treatments on seedling emergence, root system, production components, and oil. The experiment was conducted during two years in Cascavel, Paraná, Brazil. The experimental design consisted of randomized blocks with six treatments, including a control treatment (no treatment), biological treatments (Trichoderma asperellum and Bacillus subtilis), and chemical treatments (glutamic acid, thiamethoxam and zinc), with four replications. Emergence and growth crambe, as well as production components and oil in the first year were higher due to the contrast in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bacillus subtilis; Trichoderma asperellum; Thiamethoxam; Glutamic acid; Zinc.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052016000300292

Oxidative Damage and Antioxidant Response in Chenopodium murale L. Exposed to Elevated Levels of Zn
Provedor de dados: 52
Autores: Zoufan,Parzhak; Karimiafshar,Amer; Shokati,Sara; Hassibi,Payman; Rastegarzadeh,Saadat.
ABSTRACT Present study was carried out to investigate the effects of different Zn concentrations on growth and some antioxidant responses in Chenopodium murale L. The seeds were sown on the pots. 45-day plants were transferred to hydroponic solution containing 0.2 (control), 150, 300 and 600 µM Zn. The plants were harvested at 6 days after applying Zn treatments and some parameters were evaluated including plant length, fresh weight, photosynthetic pigments, malondialdehyde (MDA), ascorbate, proline and enzymatic antioxidants such as catalase (CAT), guaiacol peroxidase (GPX) and superoxide dismutase (SOD). Zn concentration showed a considerable increase in the shoot and root as the concentration of Zn increased in the medium, meanwhile the roots were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ascorbate; Enzymatic antioxidant; Lipid peroxidation; Proline; Zinc.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132018000100418

Correlation between heavy metal ions (copper, zinc, lead) concentrations and root length of Allium cepa L. in polluted river water
Provedor de dados: 52
Autores: Palacio,Soraya Moreno; Espinoza-Quiñones,Fernando Rodolfo; Galante,Raquel Manozzo; Zenatti,Dilcemara Cristina; Seolatto,Araceli Aparecida; Lorenz,Evandro Kleber; Zacarkim,Carlos Eduardo; Rossi,Nickeli; Rizzutto,Márcia de Almeida; Tabacniks,Manfredo Harri.
The present work was performed using the common onion (Allium cepa L.) as a bioindicator of toxicity of heavy metals in river water. The test waters were collected at two sampling sites: at the beginning and the end of the Toledo River. The bulbs of A. cepa L. were grown in test water with nine concentration levels of copper, zinc and lead from 0.1 to 50 ppm. In the laboratory, the influence of these test liquids on the root growth was examined during five days. For test liquids containing below 0.03-ppm dissolved Cu the root growth was reduced by 40% However, the same reduction occurred for 1-ppm dissolved Zn. For dissolved Pb, results reveal toxicity above 0.1 and 0.6 ppm at the beginning and the end of the Toledo river water, respectively.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Acute toxicity; Bioassay; Copper; Zinc; Lead; Allium cepa L.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132005000400024

Zinc detoxification by a cyanobacterium from a metal contaminated bay in Brazil
Provedor de dados: 52
Autores: Andrade,Luciana; Keim,Carolina N.; Farina,Marcos; Pfeiffer,Wolfgang C.
We describe here the trapping of zinc in polyphosphate granules of the cyanobacterium Synechocystis aquatilis NPBS-3. Cells were cultured in 25 µM of zinc chloride and prepared for electron microscopy and energy-dispersive X-ray analysis. Some ultrastructural features were changed by zinc exposure, the increase of glycogen granules number being the main change. The polyphosphate granules contained phosphorus, sulphur, calcium, iron and zinc. The trapping of zinc in polyphosphate granules seemed to be an effective way of detoxifying the metal and surviving in the bay. As a non-specific mechanism, these polyphosphate granules could also be effective in trapping other metals in excess.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heavy metals; Zinc; Sepetiba Bay; Polyphosphate granules; Glycogen granules; Detoxification.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132004000100020

Effect of adding macro and micro minerals in pig feces fed diets with different levels of probiotic
Provedor de dados: 52
Autores: Huaynate,Rizal Alcides Robles; Thomaz,Maria Cristina; Kronka,Rodolfo Nascimento; Fraga,Alessandro Luís; Scandolera,Antônio João; Budiño,Fábio Enrique Lemos.
This study aimed to verify the effect of diets with different doses (0, 100, 200 and 300 ppm) of probiotic on daily fecal production (DFP) and level of macro and micro minerals in feces of nursing (1st and 2nd initial phases) and growing pigs and during total period. The DFP, as percentage of body weight, was different (P&lt;0.05) among treatments only at 1st initial phase. Fecal levels of macro and micro minerals were similar (P&gt;0.05) among treatments, with exception of calcium and sodium excretion at 1st initial phase and calcium, zinc and nickel during total period. The addition of a poliprobiotic to diets do not affect fecal production of nursing and growing pigs. However, the presence of microorganisms, added (levels of 200 and 300 ppm) in diets...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Calcium; Digestion; Lactobacillus; Piglet; Zinc.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132006000400005

Relations among Valencia orange yields with soil and leaf nutrients in Northwestern Paraná, Brazil
Provedor de dados: 52
Autores: Fidalski,Jonez; Auler,Pedro Antonio Martins; Tormem,Valdomiro.
The Valencia orange orchards established on soils of low fertility in the Northwest region of Paraná State, Brazil, have showed symptoms of Mg deficiency and reduced fruit yields. The objective of this study was to verify the relationship between yield with soil and leaf nutrients during 1996/97 growing season. Two sites of low and high productivity were selected in seven orchards. Leaf and soil samples (fertilized rows and interrows) were collected in 1996. The results showed that the citrus yields were negatively related with soil Mg/K and Ca+Mg/K ratios in the fertilized rows, and fruit weight positively correlated with leaf Zn in the low productivity orchards. The fruit weight was positively related with leaf Ca and soil Ca in the fertilized rows of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Citrus sinensis; Foliar diagnosis; Liming; K fertilization; Calcium; Zinc.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132000000400006

Zinc and water intake in rats: investigation of adrenergic and opiatergic central mechanisms
Provedor de dados: 56
Autores: Fregoneze,J.B.; Luz,C.P.; Castro,L.; Oliveira,P.; Lima,A.K.S.; Souza,F.; Maldonado,I.; Macêdo,D.F.; Ferreira,M.G.; Bandeira,I.P.V.; Rocha Jr.,M.A.; Carvalho,F.L.Q.; De-Castro-e-Silva,E.
We have demonstrated that central administration of zinc in minute amounts induces a significant antidipsogenic action in dehydrated rats as well as in rats under central cholinergic and angiotensinergic stimulation. Here we show that acute third ventricle injections of zinc also block water intake induced by central ß-adrenergic stimulation in Wistar rats (190-250 g). Central inhibition of opioid pathways by naloxone reverses the zinc-induced antidipsogenic effect in dehydrated rats. After 120 min, rats receiving third ventricle injections of isoproterenol (160 nmol/rat) exhibited a significant increase in water intake (5.78 ± 0.54 ml/100 g body weight) compared to saline-treated controls (0.15 ± 0.07 ml/100 g body weight). Pretreatment with zinc (3.0,...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Zinc; Isoproterenol; Opioids; Thirst; Naloxone; Rats.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1999001000007

Neo-Timm staining in the thalamus of chronically epileptic rats
Provedor de dados: 56
Autores: Hamani,C.; Paulo,I. de; Mello,L.E.A.M.
The thalamus is an important modulator of seizures and is severely affected in cholinergic models of epilepsy. In the present study, chronically epileptic rats had their brains processed for neo-Timm and acetylcholinesterase two months after the induction of status epilepticus with pilocarpine. Both controls and pilocarpine-treated animals presented neo-Timm staining in the anterodorsal nucleus, laterodorsal nucleus, reticular nucleus, most intralaminar nuclei, nucleus reuniens, and rhomboid nucleus of the thalamus, as well as in the zona incerta. The intensity of neo-Timm staining was similar in control and pilocarpine-treated rats, except for the nucleus reuniens and the rhomboid nucleus, which had a lower intensity of staining in the epileptic group. In...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Epilepsy; Pilocarpine; Zinc; Sprouting; Nucleus reuniens; Midline thalamus.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2005001100016

Differential effects of lead and zinc on inhibitory avoidance learning in mice
Provedor de dados: 56
Autores: de Oliveira,F.S.; Viana,M.R.; Antoniolli,A.R.; Marchioro,M.
We studied the effects of chronic intoxication with the heavy metals lead (Pb2+) and zinc (Zn2+) on memory formation in mice. Animals were intoxicated through drinking water during the pre- and postnatal periods and then tested in the step-through inhibitory avoidance memory task. Chronic postnatal intoxication with Pb2+ did not change the step-through latency values recorded during the 4 weeks of the test (ANOVA, P&gt;0.05). In contrast, mice intoxicated during the prenatal period showed significantly reduced latency values when compared to the control group (day 1: q = 4.62, P&lt;0.05; day 7: q = 4.42, P&lt;0.05; day 14: q = 5.65, P&lt;0.05; day 21: q = 3.96, P&lt;0.05, and day 28: q = 6.09, P&lt;0.05). Although chronic postnatal intoxication with Zn2+...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Lead; Zinc; Inhibitory avoidance; Memory.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2001000100014

Zinc accumulation in phosphate granules of Ucides cordatus hepatopancreas
Provedor de dados: 56
Autores: Corrêa Junior,J.D.; Allodi,S.; Amado-Filho,G.M.; Farina,M.
Amorphous phosphate granules are present in vertebrate and invertebrate organisms. The functions attributed to these structures depend on their mineral contents and organic matrix composition. In the present study we have determined zinc concentrations in the hepatopancreas of the crab Ucides cordatus from regions contaminated with zinc, and the elemental composition of hepatopancreal phosphate granules. Organisms were collected from the contaminated areas of Sepetiba Bay (SB) and Guanabara Bay (GB), and from a non-contaminated area, Ribeira Bay (RB). The first two sites are located near the metropolitan region of Rio de Janeiro city, Brazil. Atomic absorption spectroscopy (AAS) showed a significant difference (P&amp;lt;0.05) for zinc concentration in the...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Phosphate granules; Hepatopancreas; Zinc; Energy dispersive X-ray analysis; Atomic absorption spectroscopy; Electron spectroscopic imaging.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2000000200009

Bioemulsifier production by Microbacterium sp. strains isolated from mangrove and their application to remove cadmiun and zinc from hazardous industrial residue
Provedor de dados: 58
Autores: Aniszewski,Erick; Peixoto,Raquel Silva; Mota,Fábio Faria; Leite,Selma Gomes Ferreira; Rosado,Alexandre Soares.
The contamination of ecosystems with heavy metals is an important issue in current world and remediation technologies should be in according to environmental sustainability concept. Bioemulsifier are promising agents to be used in metal removal and could be effective to many applications in environmental industries. The aims of this work was screening the potential production of bioemulsifier by microorganisms isolated from an oil contaminated mangrove, and evaluate cadmium and zinc removal potential of those strains from a hazardous industrial residue. From that, bioemulsifier-producing bacteria were isolated from urban mangrove sediments. Four isolates were identified as Microbacterium sp by 16S rRNA analysis and were able to reduce up to 53.3% of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biosemulsifier; Heavy metals; Zinc; Cadmium; Microbacterium; Bioremediation.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822010000100033

Adaptive and cross-protective responses against cadmium and zinc toxicity in cadmium-resistant bacterium isolated from a zinc mine
Provedor de dados: 58
Autores: Prapagdee,Benjaphorn; Watcharamusik,Anchulee.
Cadmium (Cd) is a major environmental hazard, which usually is detected in its ionic form of Cd2+. It also causes adverse toxic effects on human health and other living organisms. Cd-resistant bacteria were isolated from Cd-contaminated soils. One isolate, TAK1, was highly resistance level to Cd toxicity. TAK1 was isolated from soil contaminated with a high Cd concentration (204.1 mg.kg-1). The result of 16S rDNA sequence analysis found that the TAK1 showed the similarity to Ralstonia sp. Physiological adaptive and cross-protective responses to Cd and Zn killing were investigated in Ralstonia sp.TAK1. Exposure to a low concentration of Cd induced adaptive resistance to higher concentrations of Cd. In addition, pretreatment of Ralstonia sp.TAK1 with an...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bacterial responses; Cadmium; Zinc; Metal Resistance; Ralstonia sp.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822009000400014

Changes in nitrate reductase activity and oxidative stress response in the moss Polytrichum commune subjected to chromium, copper and zinc phytotoxicity
Provedor de dados: 61
Autores: Panda,Sanjib Kumar; Choudhury,Shuvasish.
The main aim of this paper was to investigate the effect of chromium (Cr), copper (Cu) and zinc (Zn) on nitrate reductase (NR) activity and oxidative stress responses in the moss Polytrichum commune. Cr, Cu and Zn resulted in the inhibition of NR activity. A decline in total chlorophyll content was observed after 24 and 48 h of metal treatment. Accumulation of the metals showed a dose and time dependent increase. High accumulation of Cu, Cr and Zn were seen in moss shoots after 24 and 48 h of treatment. Treatment of Cr, Cu and Zn for 24 or 48 h resulted in the increase of malondialdehyde (MDA) content in moss shoots. The highest increase was observed in shoots under Cu treatment followed by Cr and Zn. The MDA content was significantly higher after 48h....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antioxidants; Chromium; Copper; Malondialdehyde; Nitrate reductase; Oxidative stress; Polytrichum commune; Zinc.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202005000200001

Effects of Zn and Cd accumulation on structural and physiological characteristics of barley plants
Provedor de dados: 61
Autores: Sridhar,Balaji B. Maruthi; Han,Fengxiang X.; Diehl,Susan V.; Monts,David L.; Su,Yi.
The objectives of this study were to identify the structural changes caused by Zn and Cd accumulation in shoots and roots of barley (Hordeum vulgare) plants; and to correlate metal accumulation with anatomical, physiological and morphological changes. Potted plants were exposed to metal treatments of Zn and Cd for 19 and 16 d respectively. Leaves, stems and roots were harvested to identify structural changes and analyze metal accumulation. Barley effectively accumulated Zn (up to 11283 mg kg-1) and Cd (up to 584 mg kg-1) in the shoots. Microscopic structural changes, such as a decrease in intercellular spaces, breakdown of vascular bundles, and shrinkage of palisade and epidermal cells, occurred in leaves, stems and roots of plants treated with high...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anatomy; Cadmium; Hordeum vulgare; Microscopy; Phytoremediation; Zinc.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202007000100002

Performance of confined and grazing lambs fed diets with different mineral-concentrate supplements
Provedor de dados: 118
Autores: Silva,Aderbal M. de A; Bezerra,Leilson R; Rufino,Sara R. M; Filho,José M. Pereira; Freire,Juliana M; da Silva,Divan S; Oliveira,Ronaldo L; Bayão,Geraldo F. V.
For confined animals, performance is improved when their diet is supplemented with a mineral mixture and protein energy. This study evaluated the effect of dietary supplementation on feedlot sheep on native pasture. Two experiments were conducted in sequence, with the animals constrained in one and animals confined to pasture in the other. The experiments were conducted with 32 Santa Ines lambs, with average initial weights of 16.8 and 19.9 kg for the constrained and pasture studies, respectively. In both experiments, the animals were offered the following supplements: Supplement 1 = 200 g of the concentrate without mineral mixture; Supplement 2 = 200 g of the concentrate with mineral mixture + Mn + Zn; Supplement 3 = 300 g of the concentrate with mineral...
Tipo: Journal article
Palavras-chave: Dry matter; Feed conversion; Manganese; Ovine; Zinc.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202014000300001

Micronutrient concentration in potato clones with distinct physiological sensitivity to Al stress
Provedor de dados: 65
Autores: Tabaldi,Luciane Almeri; Castro,Gabriel Y; Cargnelutti,Denise; Skrebsky,Etiane Caldeira; Gonçalves,Jamile Fabbrin; Rauber,Renata; Rossato,Liana; Schetinger,Maria Rosa Chitolina; Bisognin,Dílson Antônio; Nicoloso,Fernando Teixeira.
The objective of this study was to evaluate the effects of aluminum (Al) on the zinc (Zn), manganese (Mn), iron (Fe) and copper (Cu) concentrations in four potato clones (Macaca and Dakota Rose: both Al-sensitive clones; and SMIC148-A and Solanum microdontum: both Al-tolerant-clones), grown in a nutrient solution (pH 4.00) with 0, 50, 100, 150 and 200mg Al L-1. Root Zn and Fe concentrations decreased linearly with the increase of Al levels in Macaca, SMIC148-A and Dakota Rose and increased linearly in S. microdontum. Shoot Zn concentration showed a quadratic relationship with Al in S. microdontum and SMIC148-A, but a curvilinear response in Dakota Rose. Shoot Fe concentration showed a quadratic relationship with Al in S. microdontum, SMIC148-A and Dakota...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Solanum tuberosum; Solanum microdontum; Zinc; Manganese; Iron; Copper.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782009000200010