RESUMO
A new ascomycete genus placed in family Capnodiaceae found in the Brazilian Cerrado is described and designated Plurispermiopsis, type species P. cerradensis.
Assuntos
Ascomicetos/genética , Ascomicetos/classificação , Ascomicetos/isolamento & purificação , Ascomicetos/ultraestrutura , Brasil , Cor , Ecossistema , FilogeniaRESUMO
Membrane protein patterns in SDS-PAGE clearly characterized Azospirillum amazonense, A. brasilense, A. lipoferum, and Herbaspirillum seropedicae. Each species showed also a typical major band with approximate molecular weights (AMWs) of 44, 39.5, 35.5, and 37.5 Kdaltons for the four species respectively. Characteristic lighter bands with AMWs of 63.5 and 19 Kdaltons were shown by A. amazonense. Similar bands of 54, 24 and 24.5 Kdaltons were typical of A. brazilense, A. lipoferum and H. seropedicae, respectively. The three Azospirillum species showed four identical proteins in common, out of the six main proteins presented in SDS-PAGE; H. seropedicae had only two major proteins with one of them common to all three Azospirillum species. The data strongly favors the maintenance of Azospirillum and Herbaspirillum as valid generic taxa as well as supports the validity of the three Azospirillum species.
Assuntos
Proteínas de Membrana/ultraestrutura , Spirillum/ultraestrutura , Azospirillum brasilense/ultraestrutura , Eletroforese em Gel de Poliacrilamida , Proteínas de Membrana/isolamento & purificaçãoRESUMO
The crystalline compound produced in large quantity in liquid medium by Aspergillus parasiticus UNBF A12, a high aflatoxin-producing strain isolated from the air in the Federal District of Brazil, was identified as kojic acid. The effect of pH on the production of crystalline kojic acid and aflatoxins by the strain was studied. Fourteen single spore isolates were evaluated for their capacity to produce kojic acid crystals and aflatoxins.