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Search Results: 1 - 10 of 55035 matches for " Henry-Silva "
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Tratamento de efluentes de carcinicultura por macrófitas aquáticas flutuantes
Henry-Silva, Gustavo Gonzaga;Camargo, Antonio Fernando Monteiro;
Revista Brasileira de Zootecnia , 2008, DOI: 10.1590/S1516-35982008000200002
Abstract: the efficiency of systems composed of two species of floating aquatic macrophyte (eichhornia crassipes and pistia stratiotes) to treat effluents from shrimp culture was evaluated in this research. the effluent originated from a pond populated with macrobrachium amazonicum. treatment systems consisted of 12 experimental tanks with aquatic macrophyte and three tanks without plants (control). water samples were collected from the fresh water supply and before and after passing through the treatment systems. there are no differences in the removal of nutrients between the two species. the higher nutrient removal was observed for total phosphorus (41.9% by control; 71.6% by e. crassipes; 69.9 by p. stratiotes; 72.5% by e. crassipes + p. stratiotes and 72.1 by p. stratiotes + e. crassipes) and turbidity (30.6% by control; 80.2% by e. crassipes; 75.2 by p. stratiotes; 79.8% by e. crassipes + p. stratiotes and 81.5 by p. stratiotes + e. crassipes). the systems containing aquatic macrophytes were efficient in nitrogen and phosphorus removal from m. amazonicum culture.
Efficiency of aquatic macrophytes to treat Nile tilapia pond effluents
Henry-Silva, Gustavo Gonzaga;Camargo, Antonio Fernando Monteiro;
Scientia Agricola , 2006, DOI: 10.1590/S0103-90162006000500003
Abstract: the effluents from fish farming can increase the quantity of suspended solids and promote the enrichment of nitrogen and phosphorus in aquatic ecosystems. in this context, the aim of this work was to evaluate the efficiency of three species of floating aquatic macrophytes (eichhornia crassipes, pistia stratiotes and salvinia molesta) to treat effluents from nile tilapia culture ponds. the effluent originated from a 1,000-m2 pond stocked with 2,000 male nile tilapia oreochromis niloticus. the treatment systems consisted of 12 experimental tanks, three tanks for each macrophyte species, and three control tanks (without plants). water samples were collected from the: (i) fish pond source water, (ii) effluent from fish pond and (iii) effluents from the treatment tanks. the following water variables were evaluated: turbidity, total and dissolved nitrogen, ammoniacal-n, nitrate-n, nitrite-n, total phosphorus and dissolved phosphorus. e. crassipes and p. stratiotes were more efficient in total phosphorus removal (82.0% and 83.3%, respectively) and total nitrogen removal (46.1% and 43.9%, respectively) than the s. molesta (72.1% total phosphorus and 42.7% total nitrogen) and the control (50.3% total phosphorus and 22.8% total nitrogen), indicating that the treated effluents may be reused in the aquaculture activity.
Efficiency of aquatic macrophytes to treat Nile tilapia pond effluents
Henry-Silva Gustavo Gonzaga,Camargo Antonio Fernando Monteiro
Scientia Agricola , 2006,
Abstract: The effluents from fish farming can increase the quantity of suspended solids and promote the enrichment of nitrogen and phosphorus in aquatic ecosystems. In this context, the aim of this work was to evaluate the efficiency of three species of floating aquatic macrophytes (Eichhornia crassipes, Pistia stratiotes and Salvinia molesta) to treat effluents from Nile tilapia culture ponds. The effluent originated from a 1,000-m2 pond stocked with 2,000 male Nile tilapia Oreochromis niloticus. The treatment systems consisted of 12 experimental tanks, three tanks for each macrophyte species, and three control tanks (without plants). Water samples were collected from the: (i) fish pond source water, (ii) effluent from fish pond and (iii) effluents from the treatment tanks. The following water variables were evaluated: turbidity, total and dissolved nitrogen, ammoniacal-N, nitrate-N, nitrite-N, total phosphorus and dissolved phosphorus. E. crassipes and P. stratiotes were more efficient in total phosphorus removal (82.0% and 83.3%, respectively) and total nitrogen removal (46.1% and 43.9%, respectively) than the S. molesta (72.1% total phosphorus and 42.7% total nitrogen) and the control (50.3% total phosphorus and 22.8% total nitrogen), indicating that the treated effluents may be reused in the aquaculture activity.
Composi??o química de macrófitas aquáticas flutuantes utilizadas no tratamento de efluentes de aqüicultura
Henry-Silva, G.G.;Camargo, A.F.M.;
Planta Daninha , 2006, DOI: 10.1590/S0100-83582006000100003
Abstract: the purpose of this work was to evaluate the chemical composition of two floating aquatic macrophytes (eichhornia crassipes and pistia stratiotes) used in the treatment of aquaculture wastewater and to infer their potential use as biomass. e. crassipes showed the highest contents of calcium (1.51%), magnesium (3,916.67 mg kg-1), manganese (1,233.33 mg kg1), zinc (81.83 mg kg-1), iron (5,425.00 mg kg-1) and copper (25.83 mg kg-1). p. stratiotes showed the highest contents of ash (18.95%), phosphorus (0.38%), nitrogen (2.40%), crude protein (15.02%) and amino acids, except for aspartic acid and tryptophan.
Características limnológicas da coluna d'água e dos efluentes de viveiros de cria??o de camar?es-da-amaz?nia
Henry-Silva, Gustavo Gonzaga;Camargo, Antonio Fernando Monteiro;Pontes, Cibele Soares;Miyase, Leonardo Kazuya;
Revista Brasileira de Zootecnia , 2010, DOI: 10.1590/S1516-35982010001000001
Abstract: the objective of this research was to characterize the effluents of fish ponds of macrobrachium amazonicum cultured in different densities of farming and to analyze the daily variation (24 hours) of the vertical temperature and oxygen saturation profile of the water column of the ponds. the study was conducted during a period of three months using 12 rectangular 100 m2 earthen ponds supplied with m. amazonicum individuals in four densities of farming (40, 60, 80 and 100 individuals/m2), each one evaluated with three replicates. follow-up of the daily variation of the temperature and of the saturation of the dissolved oxygen was monthly carried out in the fish ponds (from the surface to the bottom). it was determined, in the effluent caused by the prawn farming, the values of total-n, ammoniacal-n, nitrite-n, nitrate-n, total-p, orthophosphate-p and turbidity. daily stratifications and desestratifications of temperature and of the saturation oxygen were recorded, irrespective of farming density, characterizing the ponds as a polimitic system of circulation. the higher the density of cultivation of m. amazonicum, the higher the values of total-p, total-n, orthophosphate-p, n-ammoniacal and turbidity.
Digestibilidade aparente de macrófitas aquáticas pela tilápia-do-nilo (Oreochromis niloticus) e qualidade da água em rela??o às concentra??es de nutrientes
Henry-Silva, Gustavo Gonzaga;Camargo, Antonio Fernando Monteiro;Pezzato, Luiz Edivaldo;
Revista Brasileira de Zootecnia , 2006, DOI: 10.1590/S1516-35982006000300003
Abstract: the objectives of this trial were to determine the apparent digestibility coefficients (adc) of crude protein and amino acids for two species of free floating aquatic macrophytes (eichhornia crassipes and pistia stratiotes) by nile tilapia (oreochromis niloticus) and to determine the water quality of digestibility aquariums in relation nitrogen and phosphorus concentrations. tree feeds were developments, containing 0.10% of chromic oxide - iii, one being the reference diet (purified) and the others containing 30% of aquatic macrophytes. the nile tilapias (58.8 + 18.5 g) were fed to apparent satiation and the faeces were collected by modified guelph system. the average adc of crude protein and amino acids were, respectively, 93.17 and 93.32% for diet reference; 59.23 and 60.35% for e. crassipes; and 52.24 and 57.40% for p. stratiotes. no significant differences were observed among the adc of protein and of amino acids of the plants ingredients. the results showed lower efficiency by tilapia of nile in assimilate the most amino acids of the e. crassipes and p. stratiotes. it is possible to conclude that excretory products in the nile tilapia increase the concentrations of nitrogen and phosphorus, independent of feed.
Distribution and density of the bivalve Anomalocardia brasiliana in Rio Grande do Norte beaches during an atypical rainfall period
Talita Pinheiro Belém,Rodrigo Sávio Teixeira de Moura,Gustavo Gonzaga Henry-Silva
Biotemas , 2013,
Abstract: The aim of this study was to evaluate the distribution and density of Anomalocardia brasiliana along a 22 km stretch of beaches in the western region of Rio Grande do Norte during and after periods of unusual rainfall related to the La Ni a phenomenon. Four samples were taken every six months between April 2009 and October 2010, where imaginary lines were made perpendicular to the beach, along a spatial gradient of distance from the estuary, to collect organisms, sediments and temperature and salinity water data. There were no significant differences in A. brasiliana density between the different seasons, and the average density was 218 ind/m2 in April 2009, 198 ind/m2 in October 2009, 233 ind/m2 in April 2010 and 200 ind/m2 in October 2010. A. brasiliana showed a well-defined pattern of distribution, with its occurrence restricted mainly to the Apodi/Mossoró River estuary, where the organic matter content of the sediment was higher. Thus, this species has low resilience, since it could not regain the density it displayed prior to March 2008, before the heavy rains caused by the La Ni a phenomenon.
Richness and distribution of aquatic macrophytes in Brazilian semi-arid aquatic ecosystems
Henry-Silva, Gustavo Gonzaga;Moura, Rodrigo Sávio Teixeira de;Dantas, Luciana Lúcia de Oliveira;
Acta Limnologica Brasiliensia , 2010, DOI: 10.4322/actalb.02202004
Abstract: aim: the aim of this study was to evaluate the richness and distribution of the aquatic macrophytes in the basin of the apodi/mossoró river, in the semi-arid region (caatinga) of rio grande do norte, brazil; methods: a survey of the floristic composition of the aquatic macrophytes was made at 20 sampling stations in the basin at four seasons (august/2007, november/2007, february/2008, may/2008). specimens of each species were collected and deposited in the dárdano de andrade lima herbarium of the universidade federal rural do semi-árido; results: we found 40 species of aquatic macrophytes, in 33 genera and 22 families. the families with the most species were poaceae and cyperaceae, and the most species-rich genera were cyperus and eleocharis. the most common plant form was amphibian (42.5%), followed by emergent (27.5%), free-floating (12.5%), rooted-submersed (10.0%), and floating-leaved (7.5%). the lowest richness was observed at the estuarine region (3 species), and the highest richness in the upper basin (17 species). the rooted-submersed hydrothrix gardneri hooker f. and ceratophyllum demersum l. were observed in great abundance and frequency in the santa cruz reservoir of apodi, especially in areas close to cage farms of nile tilapia (oreochromis niloticus) (linnaeus, 1758). the most common free-floating species were eichhornia crassipes (mart.) solms., pistia stratiotes l., and salvinia auriculata aubl., predominantly in stretches that run through urban centers; conclusion: the species richness of aquatic macrophytes in aquatic environments of the caatinga is similar to that observed in other basins of brazil. because of the many dams and reservoirs in the semi-arid northeast, inventory and monitoring of aquatic macrophytes have become essential, especially in basins that will receive water from the diversion of the s?o francisco river.
Influence of aquaculture effluents on the growth of Salvinia molesta
Pistori, Raquel Eduarda Trevisan;Henry-Silva, Gustavo Gonzaga;Biudes, José Francisco Vicente;Camargo, Antonio Fernando Monteiro;
Acta Limnologica Brasiliensia , 2010, DOI: 10.4322/actalb.02202007
Abstract: objective: aquaculture generates social and economic benefits, but also causes impacts on the environment. one of the major impacts is the release of untreated effluents into rivers, reservoirs, and lakes, which can affect aquatic populations and communities. in this study, we tested the hypothesis that effluent from aquaculture favors the growth of the floating aquatic macrophyte salvinia molesta; methods: the study was carried out in a non-impacted reservoir (nir) and in another reservoir (ir) that is impacted by discharges of aquaculture effluents, and lasted for nine months. in each of the reservoirs, we installed four experimental units containing 10 ramets of s. molesta. monthly, we measured limnological variables of the water and the biomass of s. molesta in both reservoirs; results: the temperature, turbidity, electrical conductivity, alkalinity, chlorophyll-a, total kjeldahl nitrogen, and total phosphorus were higher in the ir in all the collection months. at the end of the experiment, the concentrations of total nitrogen and phosphorus in the biomass of s. molesta from the ir were higher than those in plants from the nir. the estimated support capacity (k) for s. molesta in the nir was 3.0 ± 0.7 g dm.m-2 and in the ir was 37.4 ± 2.4 g dm.m-2; conclusions: it was concluded that the discharge of aquaculture effluent modifies the limnological characteristics of the water of the receiving reservoir, and that the growth of salvinia molesta is favored by the aquaculture effluent, because of the increases in the concentrations of nitrogen and phosphorus in the water.
TAMIZAJE FITOQUíMICO Y CáLCULO DE RENDIMIENTO DE SAPOGENINAS ESTEROIDALES DE TRES PROCEDENCIAS DE Solanum quitoense var. septentrionale "NARANJILLO"
Flechas,Henry; Sánchez,Laura; Silva,Jairo;
Colombia Forestal , 2008,
Abstract: this research includes the study of aerial parts (fruits) of lulo de monte (solanum quitoense var. septentrionale).the main objective of this research was to determine the secondary metabolites and especially the presence and quantity of alkaloidal saponins, which are common in the solanaceae family. these substances are used as precursors for the manufacture of several steroid-type drugs, hormones and anti-inflammatories. the study was conducted with species of three different origins and three different maturing stages gathered in the department of cundinamarca, colombia between 2.400 and 2.600 meters above sea level during the period from march to june. sapogenins were extracted, isolated and purified through various techniques used for this purpose. the presence of saponins was proved through physical and chemical analysis, and the structural elucidation through nmr and ir spectroscopic techniques. the presence of hecogenin in green fruits from the three sources was determined. this molecular structure corresponds to a non-steroidal sapogenin reported inthis species.
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