Publikationen

2014

• Malettinin E, an antibacterial and antifungal tropolone produced by a marine Cladosporium strain

  Silber, J. ., Ohlendorf, B. ., Labes, A. ., Wenzel-Storjohann, A. ., Näther, C. ., & Imhoff, J. F. (2014). Malettinin E, an antibacterial and antifungal tropolone produced by a marine Cladosporium strain. Frontiers in Marine Science, 1, 1–6. Abgerufen von http://oceanrep.geomar.de/25470/ (Original work published 2025)

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  The isolation and structure elucidation of malettinins A?C (1?3) along with the new malettinin E (4) are described. The compounds were produced by the fungus Cladosporium sp. strain KF501, which was isolated from the German Wadden Sea. The malettinins are built up of tropolone/dihydropyran ring structures linked to a furan ring. The structure elucidation of the isolated compounds was achieved by means of one- and two-dimensional NMR spectroscopy supported by mass and UV data. The relative configuration of 4 was determined on the basis of single-crystal X-ray diffraction analysis. 1?4 exhibited antibacterial and antifungal activities when profiled against Xanthomonas campestris and Trichophyton rubrum. The influence of the chemical structure of the furan ring and of configurational changes on biological activities was observed.

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  • 2014
  • Journal Article
  • • Johanna Silber
    • Birgit Ohlendorf
    • Antje Labes
    • Arlette Wenzel-Storjohann
    • Christian Näther
    • Johannes Imhoff
  • • marinenaturalproducts
    • fungalnaturalproducts
    • antibacterial
    • antifungal
    • Cladosporium sp.
    • malettinin
    • tropolone

• Mit der Kraft des Meeres gegen Krebs

  Lange, B. ., & Labes, A. . (2014). Mit der Kraft des Meeres gegen Krebs. Meer Und Küste, 5. Abgerufen von http://oceanrep.geomar.de/25497/ (Original work published 2025)

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  Für die Behandlung schwerer Erkrankungen wie Krebs und entzündlicher Leiden gibt es dringenden Bedarf an neuen Substanzen für effizientere und schonenderer Therapien mit weniger Nebenwirkungen

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  • 2014
  • Journal Article
  • • Beate Lange
    • Antje Labes

• A Phenotypic Screening Approach to Identify Anticancer Compounds Derived from Marine Fungi

  Ellinger, B. ., Silber, J. ., Prashar, A. ., Landskron, J. ., Weber, J. ., Rehermann, S. ., … Imhoff, J. F. (2014). A Phenotypic Screening Approach to Identify Anticancer Compounds Derived from Marine Fungi. ASSAY and Drug Development Technologies, 12, 162–175. Abgerufen von http://oceanrep.geomar.de/24658/ (Original work published 2025)

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  This study covers the isolation, testing, and identification of natural products with anticancer properties. Secondary metabolites were isolated from fungal strains originating from a variety of marine habitats. Strain culture protocols were optimized with respect to growth media composition and fermentation conditions. From these producers, isolated compounds were screened for their effect on the viability and proliferation of a subset of the NCI60 panel of cancer cell lines. Active compounds of interest were identified and selected for detailed assessments and structural elucidation using nuclear magnetic resonance. This revealed the majority of fungal-derived compounds represented known anticancer chemotypes, confirming the integrity of the process and the ability to identify suitable compounds. Examination of effects of selected compounds on cancer-associated cell signaling pathways used phospho flow cytometry in combination with 3D fluorescent cell barcoding. In parallel, the study addressed the logistical aspects of maintaining multiple cancer cell lines in culture simultaneously. A potential solution involving microbead-based cell culture was investigated (BioLevitator, Hamilton). Selected cell lines were cultured in microbead and 2D methods and cell viability tests showed comparable compound inhibition in both methods (R-2=0.95). In a further technology assessment, an image-based assay system was investigated for its utility as a possible complement to ATP-based detection for quantifying cell growth and viability in a label-free manner.

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  • 2014
  • Journal Article
  • • Bernhard Ellinger
    • Johanna Silber
    • Anjali Prashar
    • Johannes Landskron
    • Jonas Weber
    • Sarah Rehermann
    • Franz-Josef Müller
    • Stephen Smith
    • Stephen Wrigley
    • Kjetil en
    • Philip Gribbon
    • Antje Labes
    • Johannes Imhoff
  • • marine fungi
    • natural products
    • cancer
    • pharmacology
    • leukemia

• Lingua Franca and its Grammar Footprint: Introducing an Index for Quantifying Grammatical Diversity in Written and Spoken Language

  John, P. ., & Brooks, B. . (2014). Lingua Franca and its Grammar Footprint: Introducing an Index for Quantifying Grammatical Diversity in Written and Spoken Language. Journal of Quantitative Linguistics, 21(1), 23. http://doi.org/https://doi.org/10.1080/09296174.2013.856130 (Original work published Dezember 2013)

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  The paper introduces a method to quantify grammar diversity based on part-of-speech tagging (POS) and presents a POS diversity index which can be used for analysing written and spoken communication independently of a text’s length. For this purpose, a series of transcripts of the radio programme Lingua Franca, broadcast by the Australian Broadcast Corporation, are assessed. The radio presenter’s grammatical footprint is compared with the POS index values of the invited guests, and the hypothesis that a significant difference in the grammar structures used by the different speakers is tested for validity using a standard ANOVA calculation. Significantly different POS diversity is found in a comparison between groups of speakers. The index provides for comparative studies of grammar structures used by individual speakers or authors.

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    • John, Peter

  • Fachbereich

    • Fachbereich 3: Information und Kommunikation

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  • 2014
  • Journal Article
  • • Peter John
    • Benjamin Brooks

• Development and Validation of a Fast and Optimized Screening Method for Enhanced Production of Secondary Metabolites Using the Marine Scopulariopsis brevicaulis Strain LF580 Producing Anti-Cancer Active Scopularide A and B

  Kramer, A. ., Paun, L. ., Imhoff, J. F., Kempken, F. ., & Labes, A. . (2014). Development and Validation of a Fast and Optimized Screening Method for Enhanced Production of Secondary Metabolites Using the Marine Scopulariopsis brevicaulis Strain LF580 Producing Anti-Cancer Active Scopularide A and B. PLoS ONE, 9, e103320. Abgerufen von http://oceanrep.geomar.de/25471/ (Original work published Juli 2014)

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  Natural compounds from marine fungi are an excellent source for the discovery and development of new drug leads. The distinct activity profiles of the two cyclodepsipeptides scopularide A and B against cancer cell lines set their marine producer strain Scopulariopsis brevicaulis LF580 into the focus of the EU project MARINE FUNGI. One of the main goals was the development of a sustainable biotechnological production process for these compounds. The secondary metabolite production of strain LF580 was optimized by random mutagenesis employing UV radiation. For a fast and reliable detection of the intracellular secondary metabolite production level, a miniaturized bioactivity-independent screening method was developed, as the random mutagenesis yielded a large number of mutants to be analysed quantitatively and none of the existing hyphenated bioassay-dependent screening systems could be applied. The method includes decreased cultivation volume, a fast extraction procedure as well as an optimized LC-MS analysis. We show that deviation could be specifically reduced at each step of the process: The measuring deviation during the analysis could be minimized to 5\% and technical deviation occurring in the downstream part to 10?15\%. Biological variation during the cultivation process still has the major influence on the overall variation. However, the approach led to a 10-fold reduction of time and similar effects on costs and effort compared to standard reference screening methods. The method was applied to screen the UV-mutants library of Scopulariopsis brevicaulis LF580. For validation purposes, the occurring variations in the miniaturized scale were compared to those in the classical Erlenmeyer flask scale. This proof of concept was performed using the wild type strain and 23 randomly selected mutant strains. One specific mutant strain with an enhanced production behavior could be obtained.

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  • 2014
  • Journal Article
  • • Annemarie Kramer
    • Linda Paun
    • Johannes Imhoff
    • Frank Kempken
    • Antje Labes
  • • Drug metabolism
    • Fungi
    • Library screening
    • Linear regression analysis
    • Liquid chromatography-mass spectrometry
    • Mutant strains Secondary metabolism
    • Ultraviolet radiation

• Nature?s Lab for Derivatization: New and Revised Structures of a Variety of Streptophenazines Produced by a Sponge-Derived Streptomyces Strain

  Kunz, A. L., Labes, A. ., Wiese, J. ., Bruhn, T. ., Bringmann, G. ., & Imhoff, J. F. (2014). Nature?s Lab for Derivatization: New and Revised Structures of a Variety of Streptophenazines Produced by a Sponge-Derived Streptomyces Strain. Marine Drugs, 12, 1699–1714. Abgerufen von http://oceanrep.geomar.de/24372/ (Original work published März 2014)

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  Eight streptophenazines (A?H) have been identified so far as products of Streptomyces strain HB202, which was isolated from the sponge Halichondria panicea from the Baltic Sea. The variation of bioactivities based on small structural changes initiated further studies on new derivatives. Three new streptophenazines (I?K) were identified after fermentation in the present study. In addition, revised molecular structures of streptophenazines C, D, F and H are proposed. Streptophenazines G and K exhibited moderate antibacterial activity against the facultative pathogenic bacterium Staphylococcus epidermidis and against Bacillus subtilis. All tested compounds (streptophenazines G, I?K) also showed moderate activities against PDE 4B.

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  • 2014
  • Journal Article
  • • Anna Kunz
    • Antje Labes
    • Jutta Wiese
    • Torsten Bruhn
    • Gerhard Bringmann
    • Johannes Imhoff
  • • marine natural product
    • phenazine
    • Baltic Sea
    • Streptomyces
    • Halichondria panicea
    • HPLC-DAD/MS
    • fermentation
    • PDE 4
    • antibiotic

• Understanding Spatial Relationships in US: A Computer-based Training Tool That Utilizes Inexpensive Off-the-Shelf Game Controllers

  Teistler, M. ., Brunberg, J. ., Bott, O. ., Breiman, R. ., Ebert, L. ., Ross, S. ., & Dresing, K. . (2014). Understanding Spatial Relationships in US: A Computer-based Training Tool That Utilizes Inexpensive Off-the-Shelf Game Controllers. RadioGraphics, 34, 1334–1343. http://doi.org/10.1148/rg.345130039

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  The authors present a simulation-based ultrasonographic (US) training tool that can help improve the understanding of spatial relationships in US. Use of a game controller to simulate a US probe allows examination of different virtual three-dimensional (3D) objects. These 3D objects are either completely artificial simple geometric objects (eg, spheres, tubes, and ellipsoids, or more complex combinations thereof) or derived from photographed gross anatomic data (eg, the Visible Human dataset [U.S. National Library of Medicine]) or clinical computed tomographic (CT) data. The virtual US probe allows infinitely variable real-time positioning of a “slice” that is displayed as a two-dimensional (2D) cross-sectional image and as part of a 3D view. Combining the 2D and 3D views helps elucidate the spatial relationships between a 3D object and derived 2D images. This training tool provides reliable real-time interactivity and is widely available and easily affordable, since it utilizes standard personal computer technology and off-the-shelf gaming hardware. For instance, it can be used at home by medical students or residents as a complement to conventional US training. In the future, this system could be adapted to support training for US-guided needle biopsy, with use of a second game controller to control the biopsy needle. Furthermore, it could be used as a more general interactive visualization tool for the evaluation of clinical 3D CT and magnetic resonance imaging data, allowing efficient and intuitive real-time creation of oblique multiplanar reformatted images. Online supplemental material is available for this article. ©RSNA, 2014

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    • Teistler, Michael

  • Abteilung/Einrichtung

    • CIVU – Center for Interaction, Visualization and Usability

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    • Fachbereich 3: Information und Kommunikation

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  • 2014
  • Journal Article
  • • Michael Teistler
    • James Brunberg
    • Oliver Bott
    • Richard Breiman
    • Lars Ebert
    • Steffen Ross
    • Klaus Dresing

• Quantitative models for sustainable supply chain management: Developments and directions

  Brandenburg, M. ., Govindan, K. ., Sarkis, J. ., & Seuring, S. . (2014). Quantitative models for sustainable supply chain management: Developments and directions. European Journal of Operational Research, 233, 299–312. http://doi.org/10.1016/j.ejor.2013.09.032

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  Sustainability, the consideration of environmental factors and social aspects, in supply chain management (SCM) has become a highly relevant topic for researchers and practitioners. The application of operations research methods and related models, i.e. formal modeling, for closed-loop SCM and reverse logistics has been effectively reviewed in previously published research. This situation is in contrast to the understanding and review of mathematical models that focus on environmental or social factors in forward supply chains (SC), which has seen less investigation. To evaluate developments and directions of this research area, this paper provides a content analysis of 134 carefully identified papers on quantitative, formal models that address sustainability aspects in the forward SC. It was found that a preponderance of the publications and models appeared in a limited set of six journals, and most were analytically based with a focus on multiple criteria decision making. The tools most often used comprise the analytical hierarchy process or its close relative, the analytical network process, as well as life cycle analysis. Conclusions are drawn showing that numerous possibilities and insights can be gained from expanding the types of tools and factors considered in formal modeling efforts.

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    • Brandenburg, Marcus

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  • 2014
  • Journal Article
  • • Marcus Brandenburg
    • Kannan Govindan
    • Joseph Sarkis
    • Stefan Seuring
  • • Literature review
    • OR in environment and climate change
    • OR in societal problem analysis
    • OR in sustainability
    • Supply chain management
    • Sustainability

• Extending value stream mapping through waste definition beyond customer perspective

  Khurum, M. ., Petersen, K. ., & Gorschek, T. . (2014). Extending value stream mapping through waste definition beyond customer perspective. Journal of Software: Evolution and Process, 26, 1074–1105.

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    • Petersen, Kai

  • Abteilung/Einrichtung

    • FLAIR - Flensburg Artificial Intelligence Research

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  • 2014
  • Journal Article
  • • Mahvish Khurum
    • Kai Petersen
    • Tony Gorschek

• Development of a Contactless Pitch Angle Measurement System

  Jauch, C. ., & Nussel, N. . (2014). Development of a Contactless Pitch Angle Measurement System. WIND ENGINEERING, 38(6), 12.

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    • Jauch, Clemens

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  • 2014
  • Journal Article
  • • Prof. Dr. Clemens Jauch
    • N. Nussel
  • • WETI