Angelika Preisfeld

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Fifteen bacterial strains containing 1-aminocyclopropane-1-carboxylate (ACC) deaminase were isolated from the rhizoplane of pea (Pisum sativum L.) and Indian mustard (Brassica juncea L.) grown in different soils and a long-standing sewage sludge contaminated with heavy metals. The isolated strains were characterized and assigned to various genera and(More)
In order to reconstruct the evolution of euglenid flagellates, euglenozoan SSU rDNA data have been used to investigate phylogenetic relationships with a focus on osmotrophic taxa and especially on the Rhabdomonadales. The dataset consisting of the SSU rDNAs of osmotrophic, phagotrophic and phototrophic taxa was used in parsimony, maximum-likelihood and(More)
Slr1295 (and Slr0513) in the cyanobacterium Synechocystis sp. PCC 6803 has amino acid similarity to the bacterial FbpA protein family and also to IdiA of Synechococcus PCC 6301/PCC 7942. To determine whether Slr1295 is the periplasm-located component of an iron transporter, or has a function in protecting photosystem (PS) II, subcellular localization and(More)
Expansion segments within eukaryotic nuclear SSU ribosomal RNA have been characterized in many diverse organisms. So far, only a few studies have examined the evolutionary history of SSU rDNA variable regions for monophyletic groups. A euglenozoan SSU rDNA data set was analyzed combining phylogenetic inference and examination of expansion segment evolution.(More)
Nuclear-encoded SSU rRNA genes from nine strains of Distigma and three strains of Astasia were sequenced and analysed phylogenetically with maximum-likelihood and maximum-parsimony methods. It could be demonstrated that the genus Distigma is paraphyletic, consisting of two distinct clades: one comprises four strains of the type species, Distigma proteus,(More)
The taxa Rhynchopus Skuja and Diplonema Griessmann were first described as remarkable protists with euglenid affinities. Later on, the placement of Diplonema within the Euglenozoa was confirmed by molecular data. For this study two new sequences were added to the euglenozoan data set. The uncertainly placed Rhynchopus can be identified as a close relative(More)
Solar-powered sea slugs (Sacoglossa: Gastropoda) have long captured the attention of laymen and scientists alike due to their remarkable ability to steal functional chloroplasts from their algal food, enslaving them to withstand long starvation periods. Recently, a wealth of data has shed insight into this remarkable relationship; however, the cellular(More)
The gene coding for the small ribosomal subunit RNA of Ploeotia costata contains an actively splicing group I intron (Pco.S516) which is unique among euglenozoans. Secondary structure predictions indicate that paired segments P1-P10 as well as several conserved elements typical of group I introns and of subclass IC1 in particular are present. Phylogenetic(More)
The phylogeny of phagotrophic euglenids is widely based on nuclear small subunit ribosomal DNA (18S rDNA) sequence data, but most analyses suffer from weakness in statistical support regarding the “connecting backbone” between monophyletic clades. Moreover, the position of Entosiphon has remained unclear. Testing the 18S rDNA capability for a phylogeny of(More)
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