Wolkenstein, Klaus

[["dc.bibliographiccitation.firstpage","1653"],["dc.bibliographiccitation.issue","9"],["dc.bibliographiccitation.journal","Tetrahedron Letters"],["dc.bibliographiccitation.lastpage","1655"],["dc.bibliographiccitation.volume","43"],["dc.contributor.author","Wolkenstein, Klaus"],["dc.contributor.author","Gross, Jürgen H."],["dc.contributor.author","Oeser, Thomas"],["dc.contributor.author","Schöler, Heinz F."],["dc.date.accessioned","2020-08-04T12:47:10Z"],["dc.date.available","2020-08-04T12:47:10Z"],["dc.date.issued","2002"],["dc.description.abstract","The spectroscopic characterization and the crystal structure of the 1,2,3,4,5,6-hexahydrophenanthro[1,10,9,8-opqra]perylene, which is known from the fossil record, is described."],["dc.identifier.doi","10.1016/S0040-4039(02)00085-0"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/67525"],["dc.language.iso","en"],["dc.relation.issn","0040-4039"],["dc.title","Spectroscopic characterization and crystal structure of the 1,2,3,4,5,6-hexahydrophenanthro[1,10,9,8-opqra]perylene"],["dc.type","journal_article"],["dc.type.internalPublication","no"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.journal","Angewandte Chemie"],["dc.contributor.author","Karschin, Niels"],["dc.contributor.author","Wolkenstein, Klaus"],["dc.contributor.author","Griesinger, Christian"],["dc.date.accessioned","2020-08-04T08:39:39Z"],["dc.date.available","2020-08-04T08:39:39Z"],["dc.date.issued","2020"],["dc.description.abstract","Anisotropic NMR has gained increasing popularity to determine the structure and specifically the configuration of small, flexible, non‐crystallizable molecules. However, it suffers from the necessity to dissolve the analyte in special media such as liquid crystals or polymer gels. Generally, small degrees of alignment are also caused by an anisotropic magnetic susceptibility of the molecule, for example, induced by aromatic moieties. For this mechanism, the alignment can be predicted via density functional theory. Here we show that both residual dipolar couplings and residual chemical shift anisotropies can be acquired from natural products without special sample preparation using magnetically induced alignment. On the two examples of the novel natural product gymnochrome G and the alkaloid strychnine, these data, together with the predicted alignment, yield the correct configuration with high certainty."],["dc.identifier.doi","10.1002/ange.202004881"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/67514"],["dc.language.iso","en"],["dc.relation.eissn","1521-3757"],["dc.relation.issn","0044-8249"],["dc.relation.orgunit","Abteilung Geobiologie"],["dc.title","Magnetically Induced Alignment of Natural Products for Stereochemical Structure Determination via NMR"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","451"],["dc.bibliographiccitation.issue","1585"],["dc.bibliographiccitation.journal","Proceedings of the Royal Society of London. Series B, Biological Sciences"],["dc.bibliographiccitation.lastpage","456"],["dc.bibliographiccitation.volume","273"],["dc.contributor.author","Wolkenstein, Klaus"],["dc.contributor.author","Gross, Jürgen H."],["dc.contributor.author","Falk, Heinz"],["dc.contributor.author","Schöler, Heinz F."],["dc.date.accessioned","2020-08-04T09:06:45Z"],["dc.date.available","2020-08-04T09:06:45Z"],["dc.date.issued","2006"],["dc.description.abstract","The fringelite pigments, a group ofphenanthroperylene quinones discovered in purple coloured specimens of the Upper Jurassic crinoid Liliocrinus, demonstrate exceptional preservation of organic compounds in macrofossils. Here we report the finding of hypericin and related phenanthroperylene quinones in Liliocrinus munsterianus from the original 'Fringeli' locality and in the Middle Triassic crinoid Carnallicrinus carnalli. Our results show that fringelites in fact consist ofhypericin and closely related derivatives and that the stratigraphic range of phenanthroperylene quinones is much wider than previously known. The fossil occurrence of hypericin indicates a polyketide biosynthesis of hypericin-type pigments in Mesozoic crinoids analogous to similar polyketides, which occur in living crinoids. The common presence of a characteristic distribution pattern of the fossil pigments and related polycyclic aromatic hydrocarbons further suggests that this assemblage is the result of a stepwise degradation of hypericin via a general diagenetic pathway."],["dc.identifier.doi","10.1098/rspb.2005.3358"],["dc.identifier.pmid","16615212"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/67524"],["dc.language.iso","en"],["dc.relation.issn","0962-8452"],["dc.title","Preservation of hypericin and related polycyclic quinone pigments in fossil crinoids"],["dc.type","journal_article"],["dc.type.internalPublication","no"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","15860"],["dc.bibliographiccitation.issue","37"],["dc.bibliographiccitation.journal","Angewandte Chemie International Edition"],["dc.bibliographiccitation.lastpage","15864"],["dc.bibliographiccitation.volume","59"],["dc.contributor.author","Karschin, Niels"],["dc.contributor.author","Wolkenstein, Klaus"],["dc.contributor.author","Griesinger, Christian"],["dc.date.accessioned","2021-04-14T08:26:20Z"],["dc.date.available","2021-04-14T08:26:20Z"],["dc.date.issued","2020"],["dc.identifier.doi","10.1002/anie.202004881"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/81907"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-399"],["dc.relation.eissn","1521-3773"],["dc.relation.issn","1433-7851"],["dc.title","Magnetically Induced Alignment of Natural Products for Stereochemical Structure Determination via NMR"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","e0223552"],["dc.bibliographiccitation.issue","10"],["dc.bibliographiccitation.journal","PLoS One"],["dc.bibliographiccitation.volume","14"],["dc.contributor.author","Affenzeller, Susanne"],["dc.contributor.author","Frauendorf, Holm"],["dc.contributor.author","Licha, Tobias"],["dc.contributor.author","Jackson, Daniel J."],["dc.contributor.author","Wolkenstein, Klaus"],["dc.date.accessioned","2020-08-04T08:32:28Z"],["dc.date.available","2020-08-04T08:32:28Z"],["dc.date.issued","2019"],["dc.description.abstract","Eumelanin and pheomelanin are well known and common pigments found in nature. However, their complex polymer structure and high thermostability complicate their direct chemical identification. A widely used analytical method is indirect determination using HPLC with UV detection of both types of melanin by their most abundant oxidation products: pyrrole-2,3-dicarboxylic acid (PDCA), pyrrole-2,3,5-tricarboxylic acid (PTCA), thiazole-4,5-dicarboxylic acid (TDCA), and thiazole-2,4,5-tricarboxylic acid (TTCA). An increasing interest in pigmentation in biological research led us to develop a highly sensitive and selective method to identify and quantify these melanin markers in diverse biological samples with complex matrices. By introducing solid-phase extraction (SPE, reversed-phase) following alkaline oxidation we could significantly decrease background signals while maintaining recoveries greater than 70%. Our HPLC-UV-MS method allows for confident peak identification via exact mass information in corresponding UV signals used for quantitation. In addition to synthetic melanin and Sepia officinalis ink as reference compounds eumelanin markers were detected in brown human hair and a brown bivalve shell (Mytilus edulis). Brown feathers from the common chicken (Gallus g. domesticus) yielded all four eumelanin and pheomelanin markers. The present method can be easily adapted for a wide range of future studies on biological samples with unknown melanin content."],["dc.identifier.doi","10.1371/journal.pone.0223552"],["dc.identifier.pmid","31622353"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/16606"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/67513"],["dc.language.iso","en"],["dc.notes.intern","Merged from goescholar"],["dc.relation.issn","1932-6203"],["dc.relation.orgunit","Abteilung Geobiologie"],["dc.rights","CC BY 4.0"],["dc.rights.uri","https://creativecommons.org/licenses/by/4.0"],["dc.title","Quantitation of eumelanin and pheomelanin markers in diverse biological samples by HPLC-UV-MS following solid-phase extraction"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","759"],["dc.bibliographiccitation.issue","5"],["dc.bibliographiccitation.journal","Monatshefte für Chemie"],["dc.bibliographiccitation.lastpage","761"],["dc.bibliographiccitation.volume","150"],["dc.contributor.author","Wolkenstein, Klaus"],["dc.date.accessioned","2020-08-04T08:44:41Z"],["dc.date.available","2020-08-04T08:44:41Z"],["dc.date.issued","2019"],["dc.identifier.doi","10.1007/s00706-019-2369-1"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/67516"],["dc.language.iso","en"],["dc.relation.eissn","1434-4475"],["dc.relation.issn","0026-9247"],["dc.relation.orgunit","Abteilung Geobiologie"],["dc.title","Personal account: Heinz Falk’s contributions to geosciences"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1"],["dc.bibliographiccitation.lastpage","126"],["dc.contributor.author","Falk, Heinz"],["dc.contributor.author","Wolkenstein, Klaus"],["dc.contributor.editor","Kinghorn, A. D."],["dc.contributor.editor","Falk, H."],["dc.contributor.editor","Gibbons, S."],["dc.contributor.editor","Kobayashi, J."],["dc.date.accessioned","2020-08-04T08:51:34Z"],["dc.date.available","2020-08-04T08:51:34Z"],["dc.date.issued","2017"],["dc.description.abstract","The natural products synthesized by organisms that were living a long time ago gave rise to their molecular fossils. These can consist of either the original unchanged compounds or they may undergo peripheral transformations in which their skeletons remain intact. In cases when molecular fossils can be traced to their organismic source, they are termed \"geological biomarkers\".This contribution describes apolar and polar molecular fossils and, in particular biomarkers, along the lines usually followed in organic chemistry textbooks, and points to their bioprecursors when available. Thus, the apolar compounds are divided in linear and branched alkanes followed by alicyclic compounds and aromatic and heterocyclic molecules, and, in particular, the geoporphyrins. The polar molecular fossils contain as functional groups or constituent units ethers, alcohols, phenols, carbonyl groups, flavonoids, quinones, and acids, or are polymers like kerogen, amber, melanin, proteins, or nucleic acids. The final sections discuss the methodology used and the fundamental processes encountered by the biomolecules described, including diagenesis, catagenesis, and metagenesis."],["dc.identifier.doi","10.1007/978-3-319-45618-8_1"],["dc.identifier.pmid","28160211"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/67518"],["dc.language.iso","en"],["dc.publisher","Springer"],["dc.publisher.place","Cham"],["dc.relation.doi","10.1007/978-3-319-45618-8"],["dc.relation.eisbn","978-3-319-45618-8"],["dc.relation.isbn","978-3-319-45616-4"],["dc.relation.ispartof","Progress in the Chemistry of Organic Natural Products"],["dc.relation.orgunit","Abteilung Geobiologie"],["dc.title","Natural Product Molecular Fossils"],["dc.type","book_chapter"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","e12625"],["dc.bibliographiccitation.issue","5"],["dc.bibliographiccitation.journal","Palaeontology"],["dc.bibliographiccitation.volume","65"],["dc.contributor.affiliation","Wolkenstein, Klaus; 1\r\nDepartment of Geobiology, Geoscience Centre\r\nUniversity of Göttingen\r\nGoldschmidtstraße 3 37077 Göttingen Germany"],["dc.contributor.author","Wolkenstein, Klaus"],["dc.contributor.editor","Hautmann, Michael"],["dc.date.accessioned","2022-12-01T08:31:14Z"],["dc.date.available","2022-12-01T08:31:14Z"],["dc.date.issued","2022"],["dc.date.updated","2022-11-27T10:10:55Z"],["dc.description.abstract","Abstract\r\nUV light‐induced fluorescence is widely used as a key to reveal residual shell colour patterns of Neogene and Palaeogene molluscs. However, only few examples of fluorescent colour patterns are known from Mesozoic marine shells and little is known about the nature of fluorescence in fossils. Here, UV light‐induced fluorescence reveals previously unseen abundance and diversity in the colour patterns of the basal pectinid Pleuronectites laevigatus from the Middle Triassic Muschelkalk of Central Europe. In addition to known variations of radial bands, a multitude of zigzag and zigzag‐related patterns was found. The diversity of colour patterns is comparable to modern pectinids and is interpreted as colour pattern polymorphism. Raman spectra of the colour patterns indicated the preservation of residual organic pigments with aromatic moieties. The fluorescence properties of P. laevigatus and other basal pectinids from the Muschelkalk of Germany and France are described in detail, suggesting that colour pattern fluorescence is due to colourless diagenetic products of the pigments, not to the fossil pigments themselves. A remarkable feature of the colour patterns of P. laevigatus is the presence of different fluorescence colours. Because a gradual shift of the fluorescence colour from yellow to red with decreasing intensity to finally non‐fluorescent is observed, which correlates with the provenance of the specimens, the fluorescence properties are interpreted to reflect differences in diagenetic history. The results show that the fluorescence colour of fossil molluscs, especially of Mesozoic molluscs, may be affected by diagenesis and should only be used with caution for taxonomic purposes."],["dc.description.sponsorship","Deutsche Forschungsgemeinschaft http://dx.doi.org/10.13039/501100001659"],["dc.identifier.doi","10.1111/pala.12625"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/118116"],["dc.language.iso","en"],["dc.notes.intern","DOI-Import GROB-621"],["dc.relation.eissn","1475-4983"],["dc.relation.issn","0031-0239"],["dc.relation.orgunit","Abteilung Geobiologie"],["dc.rights","This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited."],["dc.title","Fluorescent colour patterns in the basal pectinid\r\n Pleuronectites\r\n from the Middle Triassic of Central Europe: origin, fate and taxonomic implications of fluorescence"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","E320"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","Geology"],["dc.bibliographiccitation.lastpage","E321"],["dc.bibliographiccitation.volume","42"],["dc.contributor.author","Wolkenstein, Klaus"],["dc.date.accessioned","2018-11-07T09:43:13Z"],["dc.date.available","2018-11-07T09:43:13Z"],["dc.date.issued","2014"],["dc.identifier.doi","10.1130/G34583C.1"],["dc.identifier.isi","000333244000001"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/34127"],["dc.language.iso","en"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.relation.eissn","0091-7613"],["dc.relation.issn","1943-2682"],["dc.relation.orgunit","Abteilung Geobiologie"],["dc.title","Isolation and characterization of the earliest taxon-specific organic molecules (Mississippian, Crinoidea) Comment"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","163"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","Journal of Natural Products"],["dc.bibliographiccitation.lastpage","167"],["dc.bibliographiccitation.volume","82"],["dc.contributor.author","Wolkenstein, Klaus"],["dc.contributor.author","Fuentes-Monteverde, Juan Carlos"],["dc.contributor.author","Nath, Nilamoni"],["dc.contributor.author","Oji, Tatsuo"],["dc.contributor.author","Griesinger, Christian"],["dc.date.accessioned","2020-08-04T08:49:28Z"],["dc.date.available","2020-08-04T08:49:28Z"],["dc.date.issued","2019"],["dc.description.abstract","Five new water-soluble amido- and aminoanthraquinone pigments, hypalocrinins A-E (1-5), the new amidoanthraquinone biaryls hypalocrinin F (6) and hypalocrinin G (7), and the known compounds 6-bromoemodic acid (8), crinemodin (9), and crinemodin sulfate (10) were isolated from the deep sea crinoid Hypalocrinus naresianus collected off Japan. The structures of the compounds were elucidated by NMR spectroscopy and mass spectrometry. Amido- and aminoquinones are quite unusual among natural products. The hypalocrinins are the first naturally occurring anthraquinones and anthraquinone biaryls conjugated with taurine."],["dc.identifier.doi","10.1021/acs.jnatprod.8b00803"],["dc.identifier.pmid","30596488"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/67517"],["dc.language.iso","en"],["dc.relation.eissn","1520-6025"],["dc.relation.issn","0163-3864"],["dc.relation.orgunit","Abteilung Geobiologie"],["dc.title","Hypalocrinins, Taurine-Conjugated Anthraquinone and Biaryl Pigments from the Deep Sea Crinoid Hypalocrinus naresianus"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]