Friedl, Thomas

[["dc.bibliographiccitation.firstpage","471"],["dc.bibliographiccitation.issue","4"],["dc.bibliographiccitation.journal","European Journal of Phycology"],["dc.bibliographiccitation.lastpage","491"],["dc.bibliographiccitation.volume","53"],["dc.contributor.author","Kryvenda, Anastasiia"],["dc.contributor.author","Rybalka, Nataliya"],["dc.contributor.author","Wolf, Matthias"],["dc.contributor.author","Friedl, Thomas"],["dc.date.accessioned","2019-07-22T14:44:30Z"],["dc.date.available","2019-07-22T14:44:30Z"],["dc.date.issued","2018"],["dc.description.abstract","here is an increasing interest in the Eustigmatophyceae, a class of stramenopile microalgae, because they offer a variety of high-value health-beneficial compounds, e.g. polyunsaturated fatty acids (PUFAs), while concomitantly producing high biomass. Clarification of the taxonomy of these organisms at the species level is important in order to achieve reproducible results and constant yields of valuable compounds in their exploitation. Here the distinction of the, so far exclusively, morphologically defined species of the genera Eustigmatos and Vischeria was tested. Distinctions inferred from almost full 18S and ITS2 rRNA as well as plastid-encoded rbcL gene sequences were evaluated following a morphological investigation. The ITS2 secondary-structure-based phylogenies separated independent lineages (species) with long internal branches. This recommends ITS2 as a promising marker for a DNA metabarcoding approach (culture-independent biodiversity assessment). In contrast, the 18S V4 region which is commonly used in metabarcoding was almost invariant, whereas the almost full length sequences distinguished eight groups/types of strains. Monophyly of the species was supported by shared ITS2 secondary structure features, making them distinct from other eustigmatophyte lineages in concordance with phylogenetic analyses. No groups of strains were congruently supported by all three markers. Consequently, the previous distinction of two genera on the basis of morphology cannot be retained and the species should be accommodated in a single genus, Vischeria. Taxonomic changes among the species with the definition of epitypes, on the basis of cryopreserved strains, are recommended. Two findings point to a more complex evolutionary history of the species. The rbcL and nuclear markers resulted in disparate groupings of strains. In three species divergent intragenomic ITS2 paralogues were revealed. Therefore, a still broader taxon sampling, in conjunction with a deep sequencing approach, is needed for a more comprehensive understanding of the complex evolution of eustigmatophyte species."],["dc.identifier.doi","10.1080/09670262.2018.1475015"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/61834"],["dc.language.iso","en"],["dc.relation.issn","0967-0262"],["dc.relation.issn","1469-4433"],["dc.title","Species distinctions among closely related strains of Eustigmatophyceae (Stramenopiles) emphasizing ITS2 sequence-structure data: Eustigmatos and Vischeria"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","204"],["dc.bibliographiccitation.journal","European Journal of Phycology"],["dc.bibliographiccitation.lastpage","205"],["dc.bibliographiccitation.volume","50"],["dc.contributor.author","Darienko, Tatyana"],["dc.contributor.author","Siegesmund, Maria A."],["dc.contributor.author","Lorenz, Maike"],["dc.contributor.author","Rybalka, Nataliya"],["dc.contributor.author","Friedl, Thomas"],["dc.date.accessioned","2018-11-07T10:03:01Z"],["dc.date.available","2018-11-07T10:03:01Z"],["dc.date.issued","2015"],["dc.identifier.isi","000360244400382"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/38353"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Taylor & Francis Ltd"],["dc.publisher.place","Abingdon"],["dc.relation.issn","1469-4433"],["dc.relation.issn","0967-0262"],["dc.title","EFFECTS OF CRYOPRESERVATION ON SELECTED GREEN MICROALGAE USING AFLP FINGERPRINTING FOR GENOMIC AND EPIGENOMIC STABILITY ASSESSMENT"],["dc.type","conference_abstract"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","291"],["dc.bibliographiccitation.issue","3-4"],["dc.bibliographiccitation.journal","Geomicrobiology Journal"],["dc.bibliographiccitation.lastpage","303"],["dc.bibliographiccitation.volume","32"],["dc.contributor.author","Mudimu, Opayi"],["dc.contributor.author","Rybalka, Nataliya"],["dc.contributor.author","Bauersachs, Thorsten"],["dc.contributor.author","Friedl, Thomas"],["dc.contributor.author","Schulz, Ruediger"],["dc.date.accessioned","2018-11-07T09:59:35Z"],["dc.date.available","2018-11-07T09:59:35Z"],["dc.date.issued","2015"],["dc.description.abstract","A prerequisite for the growth of microalgae on an industrial scale is the optimization of cultivation conditions and the reduction of production costs. The nutrient elements, heat and carbon dioxide provided by flue gas can be used to increase biomass production. The aim of this study was to investigate the effects of different CO2 concentrations on algal strains with regard to biomass production, alpha-tocopherol content, fatty acid composition and fatty acid content. For this, we grew the three microalgae Coccomyxa sp., Desmodesmus sp. and Muriella terrestris that were isolated from two tufa-forming karstwater creeks characterized by high CO2 partial pressures. No significant differences in biomass production rate were observed when the cultures were gassed with air or 15% (v/v) CO2. However, cell growth increased substantially when 5% (v/v) CO2 was used. The content of alpha-tocopherol increased in the stationary phase compared to the logarithmic phase in all investigated strains. In contrast, it decreased significantly when the cultures were aerated with either 5% (v/v) CO2 or 15% (v/v) CO2. The saturation level of fatty acids was significantly higher in cultures aerated with CO2 in the stationary phase compared to the logarithmic phase. In contrast, it decreased in the stationary phase when the cultures were gassed with air. Fatty acid contents increased in the stationary phase compared to the logarithmic phase. It was also higher by gassing with 5% (v/v) CO2 and decreased when the cultures were aerated with air or 15% (v/v) CO2. When the biomass production rates were taken into consideration together with contents of alpha-tocopherol and total fatty acid, the productivity of both increased considerably when the cultures experienced gassing by a 5% (v/v) CO2."],["dc.identifier.doi","10.1080/01490451.2014.889784"],["dc.identifier.isi","000352349600009"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/37625"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Taylor & Francis Inc"],["dc.relation.issn","1521-0529"],["dc.relation.issn","0149-0451"],["dc.title","Influence of Different CO2 Concentrations on Microalgae Growth, alpha-Tocopherol Content and Fatty Acid Composition"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","12200"],["dc.bibliographiccitation.issue","19"],["dc.bibliographiccitation.journal","International Journal of Hydrogen Energy"],["dc.bibliographiccitation.lastpage","12210"],["dc.bibliographiccitation.volume","36"],["dc.contributor.author","Abdel-Basset, R."],["dc.contributor.author","Friedl, Thomas"],["dc.contributor.author","Mohr, Kathrin I."],["dc.contributor.author","Rybalka, Nataliya"],["dc.contributor.author","Martin, W."],["dc.date.accessioned","2018-11-07T08:52:02Z"],["dc.date.available","2018-11-07T08:52:02Z"],["dc.date.issued","2011"],["dc.description.abstract","A Nostoc-like cyanobacterium, strain SAG 2306, was isolated from a clay soil sample at Assiut region (Egypt). Morphology and analysis of 16S rDNA identified it as a member of the heterocyteous cyanobacteria (Nostocales). Unexpectedly, chlorophyll a and dry weight were higher in manganese deprived (Mn-) or in manganese double deprived (Mn-) than in replete (Mn+) cells. The latter phase of Mn- diluted the cellular content in daughter cells to a critical minimal value of about 1.5% relative to the original 100% in Mn+. Similar to growth, Nostoc sp. exhibited a significant age-dependent biphasic impact on hydrogenases activity. Older cells of 120 h age displayed higher hydrogen evolution rates than younger ones. The results suggest inhibitory effects of the 12 mu M manganese contained in BG11 medium (Mn+) not only on growth but also on hydrogen production during the first 72 h of growth. Copyright (C) 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved."],["dc.identifier.doi","10.1016/j.ijhydene.2011.07.006"],["dc.identifier.isi","000295657300014"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/22074"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Pergamon-elsevier Science Ltd"],["dc.relation.issn","0360-3199"],["dc.title","High growth rate, photosynthesis rate and increased hydrogen(ases) in manganese deprived cells of a newly isolated Nostoc-like cyanobacterium (SAG 2306)"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.journal","European Journal of Phycology"],["dc.bibliographiccitation.volume","46"],["dc.contributor.author","Friedl, Thomas"],["dc.contributor.author","Rybalka, Nataliya"],["dc.contributor.author","Hallmann, Christine"],["dc.contributor.author","Hodac, Ladislav"],["dc.contributor.author","Kleinfeld, Juliane"],["dc.contributor.author","Rockstuhl, Robert"],["dc.contributor.author","Spitzer, Karolin"],["dc.contributor.author","Olech, Maria"],["dc.contributor.author","Kostikov, Igor Y."],["dc.date.accessioned","2018-11-07T09:01:11Z"],["dc.date.available","2018-11-07T09:01:11Z"],["dc.date.issued","2011"],["dc.format.extent","43"],["dc.identifier.isi","000299418700044"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/24354"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Taylor & Francis Ltd"],["dc.publisher.place","Abingdon"],["dc.relation.issn","0967-0262"],["dc.title","ASSESSING DISTRIBUTION PATTERNS IN TERRESTRIAL ALGAE FROM VARIOUS HABITATS: A MOLECULAR APPROACH"],["dc.type","conference_abstract"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.journal","European Journal of Phycology"],["dc.bibliographiccitation.volume","46"],["dc.contributor.author","Rybalka, Nataliya"],["dc.contributor.author","Kostikov, Igor Y."],["dc.contributor.author","Massalski, Andrzej"],["dc.contributor.author","Schulz, Ruediger"],["dc.contributor.author","Friedl, Thomas"],["dc.date.accessioned","2018-11-07T09:01:12Z"],["dc.date.available","2018-11-07T09:01:12Z"],["dc.date.issued","2011"],["dc.format.extent","67"],["dc.identifier.isi","000299418700085"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/24359"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Taylor & Francis Ltd"],["dc.publisher.place","Abingdon"],["dc.relation.issn","0967-0262"],["dc.title","TESTING FOR SPECIES AND GENUS CONCEPTS AND ENDEMISM IN FILAMENTOUS XANTHOPHYCEAE (STRAMEOPILES)"],["dc.type","conference_abstract"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","554"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","Environmental Microbiology"],["dc.bibliographiccitation.lastpage","565"],["dc.bibliographiccitation.volume","11"],["dc.contributor.author","Rybalka, Nataliya"],["dc.contributor.author","Andersen, Robert A."],["dc.contributor.author","Kostikov, Igor Y."],["dc.contributor.author","Mohr, Kathrin I."],["dc.contributor.author","Massalski, Andrzej"],["dc.contributor.author","Olech, Maria"],["dc.contributor.author","Friedl, Thomas"],["dc.date.accessioned","2018-11-07T08:31:57Z"],["dc.date.available","2018-11-07T08:31:57Z"],["dc.date.issued","2009"],["dc.description.abstract","The genetic diversity of all available culture strains of the Tribonemataceae (Stramenopiles, Xanthophyceae) from Antarctica was assessed using the chloroplast-encoded psbA /rbcL spacer region sequences, a highly variable molecular marker, to test for endemism when compared with their closest temperate relatives. There was no species endemic for Antarctica, and no phylogenetic clade corresponded to a limited geographical region. However, species of the Tribonemataceae may have Antarctic populations that are distinct from those of other regions because the Antarctic strain spacer sequences were not identical to sequences from temperate regions. Spacer sequences from five new Antarctic isolates were identical to one or more previously available Antarctic strains, indicating that the Tribonemataceae diversity in Antarctic may be rather limited. Direct comparisons of the spacer sequences and phylogenetic analyses of the more conserved rbcL gene revealed that current morphospecies were inadequate to describe the actual biodiversity of the group. For example, the genus Xanthonema, as currently circumscribed, was paraphyletic. Fortunately, the presence of distinctive sequence regions within the psbA/rbcL spacer, together with differences in the rbcL phylogeny, provided significant autoapomorphic criteria to re-define the Tribonemataceae species."],["dc.identifier.doi","10.1111/j.1462-2920.2008.01787.x"],["dc.identifier.isi","000263755700002"],["dc.identifier.pmid","19278444"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/17234"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Wiley-blackwell Publishing, Inc"],["dc.relation.issn","1462-2912"],["dc.title","Testing for endemism, genotypic diversity and species concepts in Antarctic terrestrial microalgae of the Tribonemataceae (Stramenopiles, Xanthophyceae)"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","2867"],["dc.bibliographiccitation.issue","6"],["dc.bibliographiccitation.journal","Journal of Applied Phycology"],["dc.bibliographiccitation.lastpage","2875"],["dc.bibliographiccitation.volume","29"],["dc.contributor.author","Mudimu, Opayi"],["dc.contributor.author","Koopmann, Inga Klara"],["dc.contributor.author","Rybalka, Nataliya"],["dc.contributor.author","Friedl, Thomas"],["dc.contributor.author","Schulz, Rüdiger"],["dc.contributor.author","Bilger, Wolfgang"],["dc.date.accessioned","2020-12-10T14:11:38Z"],["dc.date.available","2020-12-10T14:11:38Z"],["dc.date.issued","2017"],["dc.identifier.doi","10.1007/s10811-017-1188-1"],["dc.identifier.eissn","1573-5176"],["dc.identifier.issn","0921-8971"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/71141"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-354"],["dc.title","Screening of microalgae and cyanobacteria strains for α-tocopherol content at different growth phases and the influence of nitrate reduction on α-tocopherol production"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.journal","European Journal of Phycology"],["dc.bibliographiccitation.volume","50"],["dc.contributor.author","Rybalka, Nataliya"],["dc.contributor.author","Boy, Jens"],["dc.contributor.author","Nacke, Heiko"],["dc.contributor.author","Daniel, Rolf"],["dc.contributor.author","Friedl, Thomas"],["dc.date.accessioned","2018-11-07T10:03:00Z"],["dc.date.available","2018-11-07T10:03:00Z"],["dc.date.issued","2015"],["dc.identifier.isi","000360244400026"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/38350"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Taylor & Francis Ltd"],["dc.publisher.place","Abingdon"],["dc.title","MICROALGAE COMMUNITIES IN ANTARCTIC SOILS: CHANGES ALONG SOIL DEVELOPMENTAL STAGES AND TESTING FOR GEOGRAPHICAL DISTRIBUTION"],["dc.type","conference_abstract"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","506"],["dc.bibliographiccitation.issue","6"],["dc.bibliographiccitation.journal","Phycologia"],["dc.bibliographiccitation.lastpage","514"],["dc.bibliographiccitation.volume","59"],["dc.contributor.author","Rybalka, Nataliya"],["dc.contributor.author","Mikhailyuk, Tatiana"],["dc.contributor.author","Darienko, Tatyana"],["dc.contributor.author","Dultz, Stefan"],["dc.contributor.author","Blanke, Matthias"],["dc.contributor.author","Friedl, Thomas"],["dc.date.accessioned","2021-04-14T08:23:03Z"],["dc.date.available","2021-04-14T08:23:03Z"],["dc.date.issued","2020"],["dc.identifier.doi","10.1080/00318884.2020.1802950"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/80787"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-399"],["dc.relation.eissn","2330-2968"],["dc.relation.issn","0031-8884"],["dc.title","Genotypic and phylogenetic diversity of new isolates of terrestrial Xanthophyceae (Stramenopiles) from maritime sandy habitats"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]