| microcystin production by a freshwater spring cyanobacterium of the genus fischerella. | we investigated the production of a hepatotoxic, cyclic heptapeptide, microcystin, by a filamentous branched cyanobacterium belonging to the order stigonematales, genus fischerella. the freshwater fischerella sp. strain cena161 was isolated from spring water in a small concrete dam in piracicaba, são paulo state, brazil, and identified by combining a morphological description with 16s rrna gene sequencing and phylogenetic analysis. microcystin (mcyst) analysis performed using an elisa assay on c ... | 2009 | 19233225 |
| population dynamics: seasonal variation of phytoplankton functional groups in brazilian reservoirs (billings and guarapiranga, são paulo). | phytoplankton may function as a 'sensor' of changes in aquatic environment and responds rapidly to such changes. in freshwaters, coexistence of species that have similar ecological requirements and show the same environmental requirements frequently occurs; such species groups are named functional groups. the use of phytoplankton functional groups to evaluate these changes has proven to be very useful and effective. thus, the aim of this study was to evaluate the occurrence of functional groups ... | 2009 | 19967171 |