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Time course of virus-like particles (VLPs) double-stranded rna accumulation in toxigenic and non-toxigenic strains of Aspergillus flavus BJM
Silva,Valéria N.; Durigon,Edison Luiz; Pires,Maria de Fátima Costa; Lourenço,Alexandre; Faria,Maria Jacinta de; Corrêa,Benedito.
Two strains of Aspergillus flavus, non-toxigenic NRRL 6550 and toxigenic NRRL 5940, were studied over a period of 44 days, in order to detect the presence of virus-like particles (VLPs) by means of electron microscopy (EM) and nucleic acids electrophoresis. Only the toxigenic strain contained VLPs, presenting three-segmented dsRNA. An increase in VLPs number was observed during the exponential phase of fungal growth, up to day 12 of culture; after this, higher levels of aflatoxin production in toxigenic NRRL 5940 mycelia occurred in parallel with decreased VLPs replication.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Mycovirus; Double-stranded RNA; Virus-like particles; Aspergillus flavus.
Ano: 2001 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822001000100013
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PRIMER REGISTRO DE ABUNDANCIA VIRAL EN BAHIA COLIUMO Y PLATAFORMA CONTINENTAL FRENTE A CHILE CENTRAL Gayana
Chiang,Oscar E; Middelboe,Mathias; Quiñones,Renato A.
The abundance of virus like particles (VLP) was determined for the first time in the water column and sediment of Coliumo Bay and on a station on the continental shelf off central Chile. The VLP decreases with depth in the water column with a surface maximum of 4.1 x 10(7) VLP mL-1 and 5.87 x 10(7) VLP mL-1 on the shelf and Coliumo Bay, respectively. In the sediments the VLP ranged between 4.28 x 10(8) VLP mL (Coliumo Bay) and 1.01 x 10(8) VLP mL (shelf). The abundance of VLP is higher at the Bay both in the water column and in the sediment.
Tipo: Journal article Palavras-chave: Viruses; Virus-like particles; Prokaryotes; Humboldt Current System.
Ano: 2007 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382007000100014
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Microbial community structure in the sea surface microlayer at two contrasting coastal sites in the northwestern Mediterranean Sea ArchiMer
Joux, Fabien; Agogue, Helene; Obernosterer, Ingrid; Dupuy, Christine; Reinthaler, Thomas; Herndl, Gerhard J.; Lebaron, Philippe.
In an attempt to compare the microbial community structure between the sea surface microlayer (SML) and subsurface waters (SSW), we determined the enrichment factors (EF: the ratio of abundance or activity in the SML to abundance or activity in SSW) of 13 biological parameters. Samples were taken at 2 contrasting coastal sites in the Mediterranean Sea, corresponding to a high (Barcelona, Spain) and low (Banyuls-sur-Mer, France) urbanized area. Principal component analysis showed that temporal variability was much higher at Barcelona than at Banyuls, and that the characteristics of the SML and SSW samples were more closely related at Barcelona. At both sites, the SML was weakly enriched in heterotrophic bacteria (on average 1.1-fold), Synechococcus spp. (on...
Tipo: Text Palavras-chave: Sea surface microlayer; Enrichment factor; Microbial structure; Virus-like particles; Bacteria; Microalgae; Nanoflagellates.
Ano: 2006 URL: https://archimer.ifremer.fr/doc/00243/35434/33961.pdf
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