Consulta: subjectFacets:"Chromium"
Registros recuperados: 29
Data/hora: 01/06/2024 02:43:16

Evaluación de dos compuestos comerciales con cromo+selenio quelatados y Saccharomyces cerevisiae en dietas para ovinos en engorda.
Provedor de dados: 32
Autores: Reséndiz Hernández, Miriam.
El objetivo de este estudio fue evaluar el efecto de dos fuentes orgánicas queladas comerciales, Cr-levadura y Se-levadura, y de Saccharomyces cerevisiae (SC), en la digestibilidad in situ de la MS, FDN, FDA y PC; pH, AGV y N-NH3 en el rumen; consumo de MS, ganancia diaria de peso (GDP), conversión alimenticia (CA), peso y contenido de grasa de la canal de borregos. Los tratamientos fueron: 1) testigo (T; sin Cr, Se, ni SC); 2) T + Cr + Se; 3) T + SC; y 4) T + Cr + Se + SC, los cuales se asignaron al azar a 20 borregos criollos (29.88 ± 2.98 kg) en finalización para el experimento de variables productivas; y en un cuadro latino 4 x 4 con cuatro borregos machos (30 ± 2 kg) con cánula ruminal para evaluar degradación in situ y variables de fermentación...
Palavras-chave: Cromo; Selenio; Levadura; Ovinos; Digestibilidad; Rumen; Chromium; Selenium; Yeast; Sheep; Digestibility; Maestría; Ganadería.
Ano: 2012
URL: http://hdl.handle.net/10521/750

02src585
Provedor de dados: 8
Autores: Turner, Scott S.; Horton, Peter N.; Hursthouse, Michael B.
Tipo: Crystal Structure Data Holding
Palavras-chave: C~56~H~40~CrN~6~S~36~; Organometallic; Chromium; Charge transfer; Conduction; Magnetic compounds.
Ano: 2002
URL: http://ecrystals.chem.soton.ac.uk/927/

03SRC338
Provedor de dados: 8
Autores: Turner, Scott S.; Horton, Peter N.; Hursthouse, Michael B.
Tipo: Crystal Structure Data Holding
Palavras-chave: C~70~H~56~Cr~2~N~12~S~32~; Organometallic; Chromium; Charge transfer; Conduction.
Ano: 2003
URL: http://ecrystals.chem.soton.ac.uk/930/

02SRC723
Provedor de dados: 8
Autores: Turner, Scott S.; Horton, Peter N.; Hursthouse, Michael B.
Tipo: Crystal Structure Data Holding
Palavras-chave: C~66~H~48~Cr~2~N~12~S~32~; Organometallic; Chromium; Charge transfer; Magnetic compounds; Conduction.
Ano: 2002
URL: http://ecrystals.chem.soton.ac.uk/928/

Dynamic Cr(III) uptake by Macrocystis pyrifera and Undaria pinnatifida biomasses
Provedor de dados: 69
Autores: Plaza Cazón,Josefina; Viera,Marisa; Donati,Edgardo.
Background: The increased industrial activity has resulted in the discharge of large amount of pollutants including non-degradable metals into the environment. Chromium is produced in several industrial processes and it can be found in the environment in two stable oxidation states, Cr(VI) and Cr(III). Cr(VI) is more hazardous due to its carcinogenic and mutagenic effects on living organisms. Although much less toxic, Cr(III) can also exert genotoxic effects under prolonged or severe exposure. It can be separated from the solution by precipitation but biosorption using brown algae seems to be an effective and sustainable treatment technique owing to its cost-effectiveness and environmental friendly characteristics. Macrocystis pyrifera and Undaria...
Tipo: Journal article
Palavras-chave: Biosorption; Brown algae; Chromium; Heavy metals.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000300006

Genotoxicity and mutagenicity of water contaminated with tannery effluents, as evaluated by the micronucleus test and comet assay using the fish Oreochromis niloticus and chromosome aberrations in onion root-tips
Provedor de dados: 74
Autores: Matsumoto,Silvia Tamie; Mantovani,Mário Sérgio; Malaguttii,Mirtis Irene Ariza; Dias,Ana Lúcia; Fonseca,Inês Cristina; Marin-Morales,Maria Aparecida.
Cytotoxicity of metals is important because some metals are potential mutagens able to induce tumors in humans and experimental animals. Chromium can damage DNA in several ways, including DNA double strand breaks (DSBs) which generate chromosomal aberrations, micronucleus formation, sister chromatid exchange, formation of DNA adducts and alterations in DNA replication and transcription. In our study, water samples from three sites in the Córrego dos Bagres stream in the Franca municipality of the Brazilian state of São Paulo were subjected to the comet assay and micronucleus test using erythrocytes from the fish Oreochromis niloticus. Nuclear abnormalities of the erythrocytes included blebbed, notched and lobed nuclei, probably due to genotoxic chromium...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allium cepa; Chromium; Chromosomes aberrations; Comet assay; Micronucleus; Oreochromis niloticus.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572006000100028

Novos microelementos minerais e minerais quelatados na nutrição de bovinos.
Provedor de dados: 14
Autores: MORAES, S. da S.
Com o avanço da produção de bovinos de corte, as exigências nutricionais aumentaram e novos microelementos minerais e formas de suplementação entraram no cenário da produção de bovinos de corte. Elementos minerais, como cromo e níquel, vem sendo estudados. O efeito da suplementação de cromo para bovinos tem se destacado nos últimos tempos, como eficiente em situações de estresse. o níquel mostrou-se eficiente em dietas com baixo teor de proteínas. Estudos experimentais destacaram o arsênio como essencial para caprinos. Elementos minerais quelatados são aqueles fixados com moleculas orgânicas de baixo peso molecular, cuja absorção e mais efetiva. Embora alguns resultados experimentais mostraram-se promissores, o uso onera o custo do sal mineral. Estudos...
Tipo: Documentos (INFOTECA-E)
Palavras-chave: Quelato; Arsênio; Estresse; Supplements; Mineral nutrients; Chelato agents; Nicel; Aresenium.; Cromo; Níquel; Microelemento; Nutrição Animal; Suplemento Mineral.; Stress; Animal nutrition; Chromium; Beef cattle; Trace elements.
Ano: 2001
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/325214

Le chrome en milieu marin
Provedor de dados: 5
Autores: Chiffoleau, Jean-francois.
This document constitutes a synthesis of current knowledge on the chromium biogeochemical cycle. The natural and anthropogenic sources are evaluated, the fluxes between the various geochemical compartments are assessed, with special attention to the riverine and atmospheric inputs to the marine environment. Chromium levels in these compartments are described and show in several areas a very high contamination of marine organisms. Due to the important toxicity of this element, further investigations are absolutely required to better understand its behaviour in the marine environment.
Tipo: Text
Palavras-chave: Economic analysis; Air water exchanges; Toxicity; Biogeochemical cycle; Marine environment; Pollution; Chromium.
Ano: 1994
URL: http://archimer.ifremer.fr/doc/1994/rapport-1430.pdf

Response of the pearl oyster Pinctada margaritifera to cadmium and chromium: Identification of molecular biomarkers
Provedor de dados: 5
Autores: Gueguen, Yannick; Saulnier, Denis; Santini, Adrien; Magre, Kevin; Garen, Pierre; Bernagout, Solene; Nohl, Marine; Bouisset, Patrick; Helme, Herehia; Planes, Serge; Le Moullac, Gilles.
This study was designed to identify in the pearl oyster Pinctada margaritifera, used as a bio-accumulator, molecular biomarkers for the presence of heavy metals in the lagoon environment. Pearl oysters were exposed to 2 concentrations (1 and 10 μg L− 1) of cadmium (Cd) and chromium (Cr) compared to a control. Twelve target genes encoding proteins potentially involved in the response to heavy metal contamination with antioxidant, detoxification or apoptosis activities were selected. P. margaritifera accumulated Cd but not Cr, and mortality was related to the amount of Cd accumulated in tissues. In response to Cd-Cr contamination, metallothionein (MT) was significantly up-regulated by Cd-Cr at both concentrations, while 7 others (SOD, CAT, GPX, GSTO, GSTM,...
Tipo: Text
Palavras-chave: Pinctada margaritifera; French Polynesia; Cadmium; Chromium; Gene expression; Metallothionein.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00376/48707/49146.pdf

Action of Trivalent Chromium on Rat Liver Structure. Histometric and Haematological Studies
Provedor de dados: 77
Autores: Silva,Rogério Ferreira da; Lopes,Ruberval A; Sala,Miguel A; Vinha,Dionísio; Regalo,Simone C. H.; Souza,Ana Maria de; Gregório,Zita Maria de O.
The trace mineral trivalent chromium (Cr3+) is an essential nutrient involved in the regulation of carbohydrate, lipid and protein metabolism via an enhancement of insulin action. The present work had as objective to characterize histopathologically and histometrically the hepatic alterations of female Wistar rats, determined by the chromium III administration in drinking water. Adult rats received ration and drinking water ad libitum containing 300 or 500 mg/l chromium III during 4 months. Control animals received only water and ration. All animals were sacrificed by lethal dose of anesthetic. Samples of liver were fixed in 10% formalin for 24 h. Tissues for microscopical pathology were processed using standard procedures. Paraffin sections prepared at 6...
Tipo: Journal article
Palavras-chave: Liver; Rat; Chromium; Morphometry; Hematology.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022006000300014

Position and rate of intestinal fermentation in adult ostrich evaluated by volatile fatty acid
Provedor de dados: 19
Autores: Hongo, Akio; Ishii, Yukiko; Suzuta, Hidetaka; Enkhee, Devee; Toukura, Yuji; Hanada, Masaaki; Hidaka, Satoshi; Miyoshi, Syunzou; 本江, 昭夫; 石井, 友紀子; 鈴田, 英隆; エンヒェー, デヴィ; 藤倉, 雄司; 花田, 正明; 日高, 智; 三好, 俊三.
The study was conducted in Obihiro, Japan to examine the position and rate of intestinal fermentation in three adult ostriches (Struthio camelus) with mean liveweight of 103±4.7 kg. The ostriches were fed fresh leaves of orchardgrass (Dactylis glomerata). At twenty five hours before the slaughter, they ingested 100 g fresh leaves mixed with 20 g oblong strips (2mm wide and 30 mm long) of a filter paper, in which chromium oxide was absorbed at a rate of 40 %. After the slaughter, small intestine, cecum and large intestine were cut into 3, 2 and 7 pieces, respectively, with the same length in each organ. Crude ash content in digesta samples was the highest in muscular stomach (90.1±1.17 %), compared with 27-51 % in other organs of glandular stomach, small...
Palavras-chave: Adult ostrich; Chromium; Colon; Fermentation; Volatile fatty acid; ダチョウ成鳥; クロム; 結腸; 醗酵; 揮発性脂肪酸.
Ano: 2006
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/92

Removal of Cr6+ ions from wastewater in presence of quaternary ammonium salts
Provedor de dados: 20
Autores: Drweesh, M.A.; Salem, D.M.S.A.
The rate of reduction of Cr6+ to Cr3+ reaction in K2Cr2O7 has been studied and it is found to be first order. The rate of reaction at 0.05 mole of K2Cr2O7 have been measured in absence of quaternary ammonium salts as CTAB (Cetyl trimethyl ammonium bromide) and CPYB (Cetyl trimethyl pyridinium bromide). The rates of reaction are also measured in presence of CTAB and CPYB at four different temperatures (25, 30, 35 and 40oC). Effects of rotations are also studied. The rate of reaction was decreased by addition of salts. Thermodynamic parameters ∆G*, ∆H* and ∆S* are given.
Tipo: Journal Contribution
Palavras-chave: Absorption coefficient; Chromium; Wastewater treatment; Ammonium salts; Chromium; Wastewater treatment; Http://aims.fao.org/aos/agrovoc/c_1595; Http://aims.fao.org/aos/agrovoc/c_25312.
Ano: 2006
URL: http://hdl.handle.net/1834/1446

ASSESSMENT OF JEDDAH PARKS HEALTH STATUS BY Cyperus rotundus AND SOIL ANALYSIS UNDER WASTE WATER IRRIGATION
Provedor de dados: 87
Autores: EL-NAKHLAWY,F.S.; AL-SHAREEF,A.R.; IHSAN,M.Z.
ABSTRACT To investigate the health status of public parks in Jeddah city, a field survey was conducted based on the Cyperus rotundus weed and soil analysis of wastewater-irrigated parks during 2012. The city was divided into five different locations (North, South, East, West and Middle) and five parks were randomly sampled from each location; thus, the total number of sampled parks were twenty five. Toxic metals concentration were analyzed in the soil and in the plants while bacterial count was determined from the weed leaves. All studied toxic metals have significantly crossed the European Union safety limits for plant samples, while soil samples were just beyond the limit. The highest concentration was perceived for Lead (133-232 mg kg-1) and was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cyperus rotundus; Chromium; Bacteria; Parks health; Waste water irrigation.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582017000100213

Effects of inclustion and exposition times of sugar cane to calcium oxide on the physiologic and digestive parameters of Nellore heifers
Provedor de dados: 96
Autores: Pina,Douglas dos Santos; Valadares Filho,Sebastião de Campos; Azevêdo,José Augusto Gomes; Barbosa,Analívia Martins; Valadares,Rilene Ferreira Diniz; Detmann,Edenio.
It was aimed to evaluate the effect of inclusion and times of sugar cane exposition to whitewash on intake and total and partial digestibility of nutrients and ruminal parameters and to compare titanium dioxide and chromium oxide as markers to estimate fecal dry matter excretion and dry matter abomasal flow. It was used six rumen and abomasum cannulated Nellore females, with average body weight of 250 ± 19 kg, distributed in an incomplete 6 x 6 latin square design. The experiment was set in a 3 x 2 factorial scheme with three levels of whitewash (0; 0.5 or 1.0% natural matter) and two times of sugar cane storage (0 and 3 days). There was no effect of storage times neither interaction among levels of whitewash and storage times on the intake of nutrients....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cannulated; Chromium; Digestibility; Markers; Titanium.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982010000700026

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

BIOMASS PRODUCTION AND HEAVY METAL ABSORPTIONBY FOUR PLANTS GROWN AT THE MORAVIA DUMP, MEDELLÍN, COLOMBIA.
Provedor de dados: 37
Autores: SOLANGE SÁNCHEZ,MARÍA; TORRENEGRA,RUBÉN DARÍO; MARTÍNEZ,HERNÁN; SALAZAR,CLAUDIA EUGENIA; BARAHONA,ROLANDO.
Dumps are sites where the presence of high heavy metal (HM) concentration is a common occurrence, creating the need for implementing restoration processes immediately after their closure. In the 7.6 ha and 45 m high Morro de Moravia dump, arose from the disposal of Medellín solid wastes from 1974 to 1984, previous studies have demonstrated high contents of contaminants, including HM, prompting the need to identify effective mechanisms to implement its restoration. The objective of this study was to evaluate the adaptation, growth and phytoremediation capacity of Bidens pilosa, Lepidium virginicum, Brachiaria decumbens and Arachis pintoi. Content of HM (mg/kg) in Moravia residue matrix went from 17 to 8193 for Pb, 44 to 564 for Cr, 0.2 to 339 for Cd and 77...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bidens pilosa; Brachiaria decumbens; Chromium; Lead; Phytoremediation.
Ano: 2010
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-548X2010000200019

Ecotoxicological Effects of Three Heavy Metals on the Root Growth of Four Vascular Plants
Provedor de dados: 113
Autores: Iannacone O.,José; Alvariño F.,Lorena.
Environmental risk assessment (ERA) of terrestrial environments polluted by heavy metals in Peru requires standardized biological organisms, the use of which is simple, practical, sensitive and repeatable, such as seeds of higher plants used in eco-toxicological bioassays. The aim of this research was to evaluate the phytotoxic effects of Cr6+, Hg2+ and Pb2+ as potassium dichromate (K2Cr(2)0(7)), mercury chloride (Cl2Hg) and lead acetate ((CH3C00)2Pb), respectively, on growing roots of four species of higher terrestrial plants: onions (Allium cepa L., Liliaceae), red beets (Beta vulgaris L., Chenopodiaceae), rice (Oriza sativa L., Poaceae) and radishes (Raphanus sativus L., Brassicaceae) at 192 h (8 days) exposure. Bioassays of static sub-lethal toxicity...
Tipo: Journal article
Palavras-chave: Heavy metals; Peru; Seeds; Vascular plants; Seeds; Mining waste; Chromium; Mercury; Lead.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072005000200009

Natural occurrence of hexavalent chromium in a sedimentary aquifer in Urânia, State of São Paulo, Brazil
Provedor de dados: 42
Autores: Bourotte,Christine; Bertolo,Reginaldo; Almodovar,Marta; Hirata,Ricardo.
Anomalous concentrations of hexavalent chromium have been detected in ground-water of the Adamantina Aquifer inat least 54 municipalities located in the northwestern region of the State of São Paulo, southeast Brazil, occasionallyexceeding the permitted limit for human consumption (0.05 mg.L-1). An investigation was conducted in the municipality of Urânia, where the highest concentrations of chromium were detected regionally. It was defined that the originof this contamination is natural, since high concentrations of chromium were detected in aquifer sandstones (averageof 221 ppm) and also in pyroxenes (6000 ppm), one of the main heavy minerals found in the sediments. Besides, noother possible diffuse or point sources of contamination were observed in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chromium; Ground-water; Aquifer; Natural contamination.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000200009

Influence of chromium supplementation on energy metabolism in horses used in policing activity
Provedor de dados: 45
Autores: Fonseca,L.A; Girardi,F.M; Coelho,C.S; Barioni,G; Rangel,V.B; Gonçalves,R.C.
The influence of chromium supplementation on some blood variables in 11 adult stallions used for policing activities was evaluated. Each animal was treated with 11mg of chromium/400kg body weight, orally, for a period of 30 days. On days 0 (before) and 30 (after) the animals were evaluated and blood samples were obtained before and after exercise. Plasma glucose and lactate and serum cortisol and insulin were analyzed in each of these moments. On day 0, plasma glucose concentrations were 68.4±5.6mg/dL and 78.7±6.5mg/dL; plasma lactate concentrations were 6.2±0.6mg/dL and 13.1±7.6mg/dL; serum cortisol values were 48.5±7.9ng/mL and 42.6±19.7ng/mL; and serum insulin values were 3.0±6.4µUI/mL and 1.9±1.7µUI/mL, respectively, before and after exercise. On day...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Equine; Biochemistry; Chromium; Exercise.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352011000500019

Characterization and Metal Detoxification Potential of Moderately Thermophilic Bacillus cereus from Geothermal Springs of Himalaya
Provedor de dados: 52
Autores: Ghalib,Aslam Khan; Yasin,Muhammad; Faisal,Muhammad.
Two thermophilic Bacillus cereus strains (B. cereus-TA2 and B. cereus-TA4) used in the present study were isolated from the geothermal spring of Hunza valley, Gilgit, Pakistan. They showed the ability to withstand and grow at high temperature (85°C). Both these strains could resist multiple metals (copper, cadmium, mercury, manganese, zinc, arsenic, chromium and selenium). Strain B. cereus-TA4 reduced Cr (VI) at pH 5.0 to 9.0 but maximum reduction (83%) was observed at pH 7.0 after 48 h when initially supplied with 200 µg mL-1of K2CrO4. Lower initial concentrations such as 100 µg mL-1 supported higher reduction (90 to 95%) than that of high concentration such as 500 µg mL-1 (20 to 30%). Both the strains reduced nearly 70% of Se (IV) after 48 h of growth at...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chromium; Bioremediation; Selenium; Heavy metals.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132014000400554

Chromatographic characterization of products isolated from chrome shavings
Provedor de dados: 52
Autores: Garcia,Edivaldo E; Kimura,Cláudia C.M; Martins,Ariovaldo C; Rocha,Gisele O; Nozaki,Jorge.
Gel permeation chromatography and high performance liquid chromatography were employed for separation and chemical characterization of products isolated from chrome shavings. After enzymatic hydrolysis, the products isolated were peptides of higher molecular weight. Peptides of lower molecular weight and free aminoacids were the main products using sulfuric acid in chrome shavings solubilization. Glycine (17%) , glutamic acid (10.6%) , alanine (9.2%) , and arginine (8.2%) were the principal amino acids found. Phenylalanine(1.8%) was the main aromatic amino acid , while tryptophane was completely absent.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chrome shavings; Enzyme; Chromatography; Protein; Chromium.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89131999000300003

Assessment of chromium contamination in the Monte Alegre stream: a case study
Provedor de dados: 52
Autores: Corbi,Juliano José; Santos,Felipe André dos; Zerlin,Ricardo; Santos,Ademir dos; Froehlich,Claudio Gilberto; Trivinho-Strixino,Susana.
The aim of this work was to study the contamination by chromium in the sediments of the Monte Alegre stream and in the larvae of Odonata and the possible impact caused by them on the stream macroinvertebrates community. It was found that chromium contaminated the sediments and the aquatic biota. Although, the stream macroinvertebrates community structure did not appear to be modified.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Stream macroinvertebrates; Contamination; Chromium.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132011000300023

Effects of chromium supplementation on the infrapopulations of Anacanthorus penilabiatus (Monogenoidea) and Piscinoodinium pillulare (Dinoflagellida) parasites of Piaractus mesopotamicus (Characidae)
Provedor de dados: 52
Autores: Fujimoto,Rodrigo Yudi; Castro,Marcello Pardi de; Martins,Maurício Laterça; Moraes,Flávio Ruas de; Varella,Jamille Elzira de Almeida; Diniz,Daniel Guerreiro.
This study evaluated the parasitism by Anacanthorus penilabiatus (Monogenoidea) and Piscinoodinium pillulare (Dinoflagellida) in the gills of "pacu", Piaractus mesopotamicus supplemented with chromium in the diet. Randomised delineation by using factorial scheme (4x2x2) for Monogenoidea and 4x2x3 for Dinoflagellate with four levels of chromium (0, 6, 12, 18mg/kg diet), two stocking densities (4kg/m³ and 20kg/m ³), two classes of length (higher and lower than 17 cm) for a period of 7, 60 and 90 days, and four replicates was used. The fishes in low density which received 12 and 18mg/kg showed decreased monogeneoidea values, seven days after the experiment begin. Six, 12 and 18 mg/kg caused reduction in the dinoflagellate number in the fishes maintained at...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Piaractus mesopotamicus; Chromium; Stocking density; Piscinoodinium pillulare; Anacanthorus penilabiatus.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132010000400011

Effect of Phytoaccumulation of Arsenic and Chromium on Structural and Ultrastructural Changes of Brake Fern (Pteris vittata)
Provedor de dados: 61
Autores: Sridhar,Balaji B. Maruthi; Han,Fengxiang X.; Diehl,Susan V.; Monts,David L.; Su,Yi.
Structural and ultrastructural changes caused by bioaccumulation of As and Cr in brake fern (Pteris vittata), a known arsenic hyperaccumulator, were investigated. Potted plants of brake fern were exposed to metal treatments of As and Cr for three weeks. Leaf, stem and root samples were collected periodically and fixed for LM (Light Microscopy), SEM (Scanning Electron Microscopy) and TEM (Transmission Electron Microscopy) to evaluate anatomical changes. The fresh weights, dry weights, RWC (Relative Water Content) and plant heights were obtained before the brake fern plants were harvested for metal accumulation analysis. The As accumulated mainly in the shoots while Cr accumulated mainly in the roots of the metal-treated plants. Significant changes in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anatomy; Arsenic; Chromium; Hyperaccumulator; Microscopy; Phytoremediation; Pteris vittata; Translocation; Ultrastructure.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202011000400006

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

Chromium stress in plants
Provedor de dados: 61
Autores: Panda,S.K.; Choudhury,S.
The article presents an overview of the mechanism of chromium stress in plants. Chromium is known to be a toxic metal that can cause severe damage to plants and animals. Chromium-induced oxidative stress involves induction of lipid peroxidation in plants that causes severe damage to cell membranes. Oxidative stress induced by chromium initiates the degradation of photosynthetic pigments causing decline in growth. High chromium concentration can disturb the chloroplast ultrastructure thereby disturbing the photosynthetic process. Like copper and iron, chromium is also a redox metal and its redox behaviour exceeds that of other metals like Co, Fe, Zn, Ni, etc. The redox behaviour can thus be attributed to the direct involvement of chromium in inducing...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antioxidants; Chromium; Fenton reactions; Metallothioneins; Oxidative stress.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202005000100008

Changes induced by Cu2+ and Cr6+ metal stress in polyamines, auxins, abscisic acid titers and antioxidative enzymes activities of radish seedlings
Provedor de dados: 61
Autores: Choudhary,Sikander P.; Bhardwaj,Renu; Gupta,Bishan D.; Dutt,Prabhu; Gupta,Rajinder K.; Kanwar,Mukesh; Dutt,Pitamber.
The present study determined the effects of copper and chromium metals on the endogenous titers of polyamines, auxins, abscisic acid and antioxidative enzyme activities in Raphanus sativus L. cv. Pusa chetki seedlings. Among polyamines, putrescine and spermidine contents were enhanced by Cu2+ metal to 62.44 and 402.8 µg g-1 f.w. respectively over control. Spermine which was not observed in control was recorded in highest concentration (1287.9 µg g-1 f.w.) in Cu2+ metal stressed seedlings. On the other hand Cr6+ metal treated seedlings showed reduced contents of putrescine (1.43 µg g-1 f.w.), cadaverine (0.09 µg g-1 f.w.), spermidine (277.99 µg g-1 f.w.) and spermine (2.29 µg g-1 f.w.) when compared to control and Cu2+ metal treated seedlings. Significant...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Catalase; Chromium; Copper; Guaiacol peroxidase; Polyamines (PAs); Superoxide dismutase.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202010000400006

Nodulation, nitrogen uptake and growth of lima bean in a composted tannery sludge-treated soil
Provedor de dados: 65
Autores: Rocha,Sandra Mara Barbosa; Antunes,Jadson Emanuel Lopes; Silva,Antonio Victor Cavalcante Rocha; Oliveira,Louise Melo de Souza; Aquino,João Pedro Alves de; Melo,Wanderley Jose de; Figueiredo,Marcia do Vale Barreto; Araujo,Ademir Sérgio Ferreira de.
ABSTRACT:  This study evaluated the responses of lima bean (Phaseolus lunatus L.) to application of composted tannery sludge on nodulation, N uptake and plant growth. For eight years, the compost was applied at rates of: 0, 2.5, 5, 10, and 20 Mg ha-1 (dry basis). Plants of lima bean showed higher nodulation in treatments with compost; however, nodules reported in these treatments presented lower biomass, size and diversity than those reported in treatment without compost. Accumulation of N increased with the application of the highest rate (20 Mg ha-1), while there was an increase in chromium content in shoot with the increase in compost rates. Thus, the use of composted tannery sludge, in long-term, increases the accumulation of chromium in plants,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chromium; Industrial waste; Phaseolus lunatus; Biological N fixation.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782019001100252

Passage kinetics of digesta in horses fed with coastcross hay ground to different degrees
Provedor de dados: 64
Autores: Silva,Vinicius Pimentel; Almeida,Fernando Queiroz de; Pimentel,Róbson Ricardo Moreira; Godoi,Fernanda Nascimento de; Santos,Tiago Marques dos; Pires,Marcus Sandes.
This study was conducted to evaluate the kinetics, physicochemical characteristics and particle size of digesta in the right ventral colon (RVC) of horses fed coastcross hay ground to different degrees. Four horses fitted with cannulae in the RVC were used and were fed the following forms of hay: long, chopped, ground to 5 mm and ground to 3 mm. A Latin Square 4x4 study design was used. Each experimental period included 10 days for diet adaptation, four days for feces collection and one day for digesta collection. The kinetics of the particulate and solute phases of digesta were evaluated based on the mean retention time (MRT), passage rate (k) and transit time (TT) using two external markers: Cr-NDF and Co-EDTA. The TT of solid phase digesta was 3 hours...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chromium; Digestion; Particle size; Passage rate.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542014000500010