Artikkelit jotka sisältää sanan 'rhizoplane'

Hala Rifaat. Follow up characterisation of rhizoplane streptomycetes isolates of Cyprouspapyrus from an Egyptian wetland and their antimicrobial activities.
Avainsanat: wetland; rhizoplane; streptomycetes; antimicrobial activity; Egypt; papyrus
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The area of cultivated organic soils, and their distribution in Finland were estimated. The estimation was based on the soil classification data collected by three authorised soil testing laboratories, and the statistics of the arable land area. The data was collected in a five year period (1998-2002). During this period, over 90% of farms received environmental EU supplement and had their soils analysed. Therefore, the reliability of the estimation was now better than it used to be before Finland joined the European Union. In the Finnish soil classification system, organic soils are divided into two classes depending on their organic matter content. The area of organic soils with the organic matter content of 240% (dm) (i.e. peat) was 85000 ha, i.e. 3.8% of the arable area. The area of organic soils with the organic matter content of 20-39.9% (dm) and ofien with a mineral subsoil, was 214 000 ha i.e. 9.7% of the arable area. Altogether, the area of these soils was 300 000 ha i.e. 13.6% of the total arable area in Finland. Keywords: organic soil, peatland, mire cultivation, arable area, soil
  • Rifaat, Microbial Chemistry Department, National Research Centre, Dokki, Cairo, Egypt Sähköposti: ei.tietoa@nn.oo (sähköposti)
Hala Rifaat, Károly Márialigeti, Gábor Kovács. Investigation on rhizoplane actinomycete communities of cattail (Typha angustifolia) from a Hungarian wetland.
Avainsanat: wetland; actinomycete; cattail; Hungary; rhizoplane; streptomycetes
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Wetlands play a special role in diverting plant materials towards fossilisation. These habitats are sinks for the atmospheric carbon: mineralisation of organic materials is inhibited by specific effects of the local N and S cycles, anaerobiosis, low pH, etc. It is not surprising therefore that microbial activity was detected to be highest in the rhizosphere of wetland plants. Cattail (Typha angustifolia L.) withstands extremely low soil redox values. Cattail root samples were collected in a floating mat at the Soroksár Arm of the River Danube. The root-tip regions were used for bacteriological studies. Using the plate-count technique an average of 3.3*104 CFU/g actinomycete rhizoplane count was detected. All actinomycete colonies were isolated, purified, and strains subjected to differential diagnostic analysis (phenotypical and chemotaxonomical tests). The dominant rhizoplane actinomycetes were: Streptomyces anulatus, and Str. albidoflavus, Micromonospora chalcea and M. carbonacea, Micrococcus luteus, Brevibacterium sp. and Gordona sp. Streptomycetes were characteristic for autumn sample, whereas the other actinomycetes dominated the rhizoplane microbiota early in the vegetation period. The ecological tolerance abilities of the members of dominant groups indicate that these bacteria might be active in the rhizosphere and can be present there in their vegetative forms.
  • Rifaat, Department of Microbiology, Eötvös Loránd University, Múzeum krt. 4/a., 1088 Budapest, Hungary Sähköposti: ei.tietoa@nn.oo (sähköposti)
  • Márialigeti, Sähköposti: ei.tietoa@nn.oo
  • Kovács, Sähköposti: ei.tietoa@nn.oo

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