RESUMO
The recovery of metals from electronic waste was investigated by using fungal strain Aspergillus fumigatus A2DS, isolated from the mining industry wastewater. Fifty-seven percent of copper and 32% of nickel were leached (analyzed by Inductively Coupled Plasma Atomic Emission Spectroscopy (ICP-OES)) by the organism after one-step leaching at a temperature of 30 °C (shaking condition for 7 days). Maximum % of copper and nickel were obtained at a pH of 6 (58.7% Cu and 32% Ni), the temperature of 40 °C (61.8% Cu and 27.07% Ni), a pulp density of 0.5% (62% Cu and 42.37% Ni), and inoculums of 1% (58% Cu and 32.29% Ni). The XRD pattern of PCB showed 77.6% of copper containing compounds. XRD analysis of the leachate residue showed only 23.2% Euchorite (ASCu2H7O8) and 9.4% other copper containing compounds, indicating the leaching property of the fungus. HPLC analysis of the spent medium showed the presence of different acids like citric, succinic, and fumaric acid. The FTIR spectrum showed a decrease in carboxylic stretching in the leachate produced after bioleaching using spent medium. ICPOES of the leachate obtained using spent medium showed that 61% of the copper and 35% of nickel were leached out after seven days of incubation at shaking condition and 57% of copper and 32.8% of nickel at static condition confirming acidolysis property of the strain. A. fumigatus A2DS metal absorption and adsorption ability were observed using transmission electron microscopy (TEM) and scanning electron microscopy energy dispersive X-ray (SEM-EDX) respectively. The results thus indicate that bioleaching of Cu and Ni is bioleached by A. fumigatus A2DS.
Assuntos
Aspergillus fumigatus/metabolismo , Telefone Celular , Cobre/isolamento & purificação , Resíduo Eletrônico , Níquel/isolamento & purificação , MetaisRESUMO
Se describe una nueva especie parasitaria, cucullanus baylisi, del intestino de arius thalassinus de Bheemeli. La presente especie difiere de todas las especies conocidas reportadas de varias partes del mundo por tener un gran número de papilas caudales sésiles. Estas especies se parece estrechamente a C. theraponi por tener elevadas estructuras de la cloaca, ausencia de ciego intestinal y ventosa preanal, pero difiere en la presencia de espículas subiguales, estrechas aletas caudales, localización del anillo nervioso y papilas cervicales, tamaño del gubernaculum, forma de la cola, medidas y gran número de papilas caudales sésiles. Por lo tanto, se describe y se agrega una especie al género cucullanus y se denomina cucullanus baylisi
Assuntos
Animais , Peixes/parasitologia , Nematoides/isolamento & purificação , Intestinos/parasitologia , Nematoides/anatomia & histologia , Infecções por NematoidesRESUMO
The present species, identified as Procamallanus mathurai obtained from the stomach and intestine of fresh water fish Heteropneuste fossilis (Bloch) is redescribed. Position of vulva preequatorial which was not described earlier by Pande et al., 1963 and it differs from the original description in the size of spicules.