Publikationen

Autor*in

Jahr der Veröffentlichung

Publikationsformat

Keyword

Forschungsprojekt

Institut/Einrichtung

2012

First crenarchaeal chitinase found in Sulfolobus tokodaii

Staufenberger, T. ., Imhoff, J. F., & Labes, A. . (2012). First crenarchaeal chitinase found in Sulfolobus tokodaii. Microbiological Research, 167, 262–269. Abgerufen von http://oceanrep.geomar.de/12897/

Abstract

This is the first description of a functional chitinase gene within the crenarchaeotes. Here we report of the heterologues expression of the ORF BAB65950 from Sulfolobus tokodaii in E. coli. The resulting protein degraded chitin and was hence classified as chitinase (EC 3.2.4.14). The protein characterization revealed a specific activity of 75 mU/mg using colloidal chitin as substrate. The optimal activity of the enzyme was measured at pH 2.5 and 70 ?C, respectively. A dimeric enzyme configuration is proposed. According to amino acid sequence similarities chitinases are attributed to the two glycoside hydrolase families 18 and 19. The derived amino acid sequence of the S. tokodaii gene differed from sequences of these two glycoside hydrolase families. However, within a phylogenetic tree of protein sequences, the crenarchaeal sequence of S. tokodaii clustered in close proximity to members of the glycoside hydrolase family 18.
Suche auf Google Scholar
Exportformate

BibTeX

EndNote X3 XML

EndNote 7 XML

EndNote tagged

RIS
Filter Tags
2012

Journal Article

Tim Staufenberger

Johannes Imhoff

Antje Labes

Microbiology

Chitinase

Glycoside hydrolase

Crenarchaea

Protein overexpression
Sicherheit fördern durch interprofessionelle Kooperation

Podtschaske, B. ., & Friesdorf, W. . (2012). Sicherheit fördern durch interprofessionelle Kooperation. Mt -Medizintechnik. Organ Des Fachverbandes Biomedizinische Technik e.V. (fbmt), Des Bundesverbands Der Sachverständigen für Medizinprodukte BSM Sowie Der VDI-Gesellschaft Technologies of Life Sciences, Fachbereich Medizintechnik., 132(4), 143–145. Abgerufen von https://www.mt-medizintechnik.de/zeitschrift-mt-medizintechnik/
Suche auf Google Scholar
Exportformate

BibTeX

EndNote X3 XML

EndNote 7 XML

EndNote tagged

RIS
Weiterführende Links
Personenseiten

Podtschaske, Beatrice

Profilbereich

Gesundheit und Life Sciences

Fachbereich

Fachbereich 4: Wirtschaft
Filter Tags
2012

Journal Article

Beatrice Podtschaske

Wolfgang Friesdorf
Observation of bacteria over the surface of released oogonia from Fucus vesiculosus L (Phaeophyceae)

Goecke, F. R., Labes, A. ., Wiese, J. ., Schmaljohann, R. ., & Imhoff, J. F. (2012). Observation of bacteria over the surface of released oogonia from Fucus vesiculosus L (Phaeophyceae). Gayana Botanica, 69, 376–379. Abgerufen von http://oceanrep.geomar.de/19591/
Suche auf Google Scholar
Exportformate

BibTeX

EndNote X3 XML

EndNote 7 XML

EndNote tagged

RIS
Filter Tags
2012

Journal Article

Franz Goecke

Antje Labes

Jutta Wiese

Rolf Schmaljohann

Johannes Imhoff
The Second Skin: Ecological Role of Epibiotic Biofilms on Marine Organisms

Wahl, M. ., Goecke, F. R., Labes, A. ., Dobretsov, S. ., & Weinberger, F. . (2012). The Second Skin: Ecological Role of Epibiotic Biofilms on Marine Organisms. Frontiers in Microbiology, 3, 292. Abgerufen von http://oceanrep.geomar.de/15124/

Abstract

In the aquatic environment, biofilms on solid surfaces are omnipresent. The outer body surface of marine organisms often represents a highly active interface between host and biofilm. Since biofilms on living surfaces have the capacity to affect the fluxes of information, energy, and matter across the host?s body surface, they have an important ecological potential to modulate the abiotic and biotic interactions of the host. Here we review existing evidence how marine epibiotic biofilms affect their hosts? ecology by altering the properties of and processes across its outer surfaces. Biofilms have a huge potential to reduce its host?s access to light, gases, and/or nutrients and modulate the host?s interaction with further foulers, consumers, or pathogens. These effects of epibiotic biofilms may intensely interact with environmental conditions. The quality of a biofilm?s impact on the host may vary from detrimental to beneficial according to the identity of the epibiotic partners, the type of interaction considered, and prevailing environmental conditions. The review concludes with some unresolved but important questions and future perspectives.
Suche auf Google Scholar
Exportformate

BibTeX

EndNote X3 XML

EndNote 7 XML

EndNote tagged

RIS
Filter Tags
2012

Journal Article

Martin Wahl

Franz Goecke

Antje Labes

Sergey Dobretsov

Florian Weinberger

Stress

microbe-macroorganism interaction

modulation of interactions

epibiosis

chemical ecology

biofilm
A Novel Phytomyxean Parasite Associated with Galls on the Bull-Kelp Durvillaea antarctica (Chamisso) Hariot

Goecke, F. R., Wiese, J. ., Nunez, A. ., Labes, A. ., Imhoff, J. F., & Neuhauser, S. . (2012). A Novel Phytomyxean Parasite Associated with Galls on the Bull-Kelp Durvillaea antarctica (Chamisso) Hariot. PLoS ONE, 7, e45358. Abgerufen von http://oceanrep.geomar.de/19148/

Abstract

Durvillaea antarctica (Fucales, Phaeophyceae) is a large kelp of high ecological and economic significance in the Southern Hemisphere. In natural beds along the central coast of Chile (Pacific Ocean), abnormal growth characterized by evident gall development and discolorations of the fronds/thallus was observed. Analysing these galls by light microscopy and scanning electron microscopy revealed the presence of endophytic eukaryotes showing typical characteristics for phytomyxean parasites. The parasite developed within enlarged cells of the subcortical tissue of the host. Multinucleate plasmodia developed into many, single resting spores. The affiliation of this parasite to the Phytomyxea (Rhizaria) was supported by 18S rDNA data, placing it within the Phagomyxida. Similar microorganisms were already reported once 23 years ago, indicating that these parasites are persistent and widespread in D. antarctica beds for long times. The symptoms caused by this parasite are discussed along with the ecological and economic consequences. Phytomyxean parasites may play an important role in the marine ecosystem, but they remain understudied in this environment. Our results demonstrate for the first time the presence of resting spores in Phagomyxida, an order in which resting spores were thought to be absent making this the first record of a phagomyxean parasite with a complete life cycle so far, challenging the existing taxonomic concepts within the Phytomyxea. The importance of the here described resting spores for the survival and ecology of the phagomyxid parasite will be discussed together with the impact this parasite may have on the strongest seaweed of the world , which is an important habitat forming and economic resource from the Southern Hemisphere.
Suche auf Google Scholar
Exportformate

BibTeX

EndNote X3 XML

EndNote 7 XML

EndNote tagged

RIS
Filter Tags
2012

Journal Article

Franz Goecke

Jutta Wiese

Alejandra Nunez

Antje Labes

Johannes Imhoff

Sigrid Neuhauser

SP-NOV

LESSONIA-NIGRESCENS

MARINE MACROALGAE

CENTRAL CHILE

NEW-ZEALAND

PHAEOPHYTA

RHODOPHYTA

ALGAE

DURVILLEALES

INFECTIONS

2011

Poster: on the capacity delay error tradeoff of source coding

Lübben, R. ., & Fidler, M. . (2011). Poster: on the capacity delay error tradeoff of source coding. SIGMETRICS Perform. Eval. Rev., 39, 72–72. http://doi.org/10.1145/2034832.2034856 (Original work published 2024)
Suche auf Google Scholar

DOI Verweis
Exportformate

BibTeX

EndNote X3 XML

EndNote 7 XML

EndNote tagged

RIS
Weiterführende Links
Personenseiten

Lübben, Ralf

Fachbereich

Fachbereich 4: Wirtschaft
Filter Tags
2011

Journal Article

Ralf Lübben

M. Fidler
On the Computation of Class Polynomials with "Thetanullwerte" and Its Applications to the Unit Group Computation

Leprévost, F. ., Pohst, M. ., & Uzunkol, O. . (2011). On the Computation of Class Polynomials with "Thetanullwerte" and Its Applications to the Unit Group Computation. Experimental Mathematics, 20, 271–281. http://doi.org/10.1080/10586458.2011.565234 (Original work published 2024)
Suche auf Google Scholar

DOI Verweis
Exportformate

BibTeX

EndNote X3 XML

EndNote 7 XML

EndNote tagged

RIS
Weiterführende Links
Personenseiten

Uzunkol, Osmanbey

Fachbereich

Fachbereich 3: Information und Kommunikation
Filter Tags
2011

Journal Article

Franck Leprévost

Michael Pohst

Osmanbey Uzunkol
Impacts of supply chain management on company value: benchmarking companies from the fast moving consumer goods industry

Brandenburg, M. ., & Seuring, S. . (2011). Impacts of supply chain management on company value: benchmarking companies from the fast moving consumer goods industry. Logistics Research, 3(4), 233–248. http://doi.org/10.1007/s12159-011-0056-7

Abstract

The research question addressed is to which extent supply chain management (SCM) creates value from cost and working capital. The paper provides an empirical evaluation including insights on important criteria for value creation. In a secondary data analysis, 10 leading fast moving consumer goods (FMCG) companies are benchmarked regarding the value created from cost of goods sold (COGS) and working capital within the time horizon 2003–2008. The study applies benchmarking methodology and a discounted cash flow (DCF) based model for quantifying value contributions. It is shown that SCM is realized in a value-adding way with different emphasis on COGS or working capital. Monetarily working capital components (trade payables, trade receivables) have a high relevance for value creation. Continuous improvements and long lasting developments of value drivers are more appropriate for value creation than alternating improvements and deteriorations. Timing aspects of value driver developments have to be considered for value creation. The value of the paper stems from empirical comparison of value created by working capital and COGS and from evidence of important criteria for value creation. Further analysis based on cost components as well as benchmarking with different or extended content, such as fixed asset performance or cross-industry benchmarking, leave room for future research.
Suche auf Google Scholar

DOI Verweis
Exportformate

BibTeX

EndNote X3 XML

EndNote 7 XML

EndNote tagged

RIS
Weiterführende Links
Personenseiten

Brandenburg, Marcus

Fachbereich

Fachbereich 4: Wirtschaft
Filter Tags
2011

Journal Article

Marcus Brandenburg

Stefan Seuring

Supply chain management

Company value

Working capital

Cost of goods sold

Benchmarking

Fast moving consumer goods
Bio-mining the microbial treasures of the ocean: New natural products

Imhoff, J. F., Labes, A. ., & Wiese, J. . (2011). Bio-mining the microbial treasures of the ocean: New natural products. Biotechnology Advances, 29, 468–482. Abgerufen von http://oceanrep.geomar.de/12044/

Abstract

The biological resources of the oceans have been exploited since ancient human history, mainly by catching fish and harvesting algae. Research on natural products with special emphasis on marine animals and also algae during the last decades of the 20th century has revealed the importance of marine organisms as producers of substances useful for the treatment of human diseases. Though a large number of bioactive substances have been identified, some many years ago, only recently the first drugs from the oceans were approved. Quite astonishingly, the immense diversity of microbes in the marine environments and their almost untouched capacity to produce natural products and therefore the importance of microbes for marine biotechnology was realized on a broad basis by the scientific communities only recently. This has strengthened worldwide research activities dealing with the exploration of marine microorganisms for biotechnological applications, which comprise the production of bioactive compounds for pharmaceutical use, as well as the development of other valuable products, such as enzymes, nutraceuticals and cosmetics. While the focus in these fields was mainly on marine bacteria, also marine fungi now receive growing attention. Although culture-dependent studies continue to provide interesting new chemical structures with biological activities at a high rate and represent highly promising approaches for the search of new drugs, exploration and use of genomic and metagenomic resources are considered to further increase this potential. Many efforts are made for the sustainable exploration of marine microbial resources. Large culture collections specifically of marine bacteria and marine fungi are available. Compound libraries of marine natural products, even of highly purified substances, were established. The expectations into the commercial exploitation of marine microbial resources has given rise to numerous institutions worldwide, basic research facilities as well as companies. In Europe, recent activities have initiated a dynamic development in marine biotechnology, though concentrated efforts on marine natural product research are rare. One of these activities is represented by the Kieler Wirkstoff-Zentrum KiWiZ, which was founded in 2005 in Kiel (Germany).
Suche auf Google Scholar
Exportformate

BibTeX

EndNote X3 XML

EndNote 7 XML

EndNote tagged

RIS
Filter Tags
2011

Journal Article

Johannes Imhoff

Antje Labes

Jutta Wiese

Microbiology

Marine bacteria

marine fungi

Bioassays

natural products

Microbial interactions

Compound library

Strain collection

Marine biotechnology in Europe

Genetic resources
Informatics in Radiology: Use of a C-Arm Fluoroscopy Simulator to Support Training in Intraoperative Radiography

Bott, O. ., Dresing, K. ., Wagner, M. ., Raab, B.-W. ., & Teistler, M. . (2011). Informatics in Radiology: Use of a C-Arm Fluoroscopy Simulator to Support Training in Intraoperative Radiography. RadioGraphics, 31, E65-E75. http://doi.org/10.1148/rg.313105125

Abstract

Mobile image intensifier systems (C-arms) are used frequently in orthopedic and reconstructive surgery, especially in trauma and emergency settings, but image quality and radiation exposure levels may vary widely, depending on the extent of the C-arm operator s knowledge and experience. Current training programs consist mainly of theoretical instruction in C-arm operation, the physical foundations of radiography, and radiation avoidance, and are largely lacking in hands-on application. A computer-based simulation program such as that tested by the authors may be one way to improve the effectiveness of C-arm training. In computer simulations of various scenarios commonly encountered in the operating room, trainees using the virtX program interact with three-dimensional models to test their knowledge base and improve their skill levels. Radiographs showing the simulated patient anatomy and surgical implants are “reconstructed” from data computed on the basis of the trainee s positioning of models of a C-arm, patient, and table, and are displayed in real time on the desktop monitor. Trainee performance is signaled in real time by color graphics in several control panels and, on completion of the exercise, is compared in detail with the performance of an expert operator. Testing of this computer-based training program in continuing medical education courses for operating room personnel showed an improvement in the overall understanding of underlying principles of intraoperative radiography performed with a C-arm, with resultant higher image quality, lower overall radiation exposure, and greater time efficiency. Supplemental material available at http://radiographics.rsna.org/lookup/suppl/doi:10.1148/rg.313105125/-/DC1.© RSNA, 2011
Suche auf Google Scholar

DOI Verweis
Exportformate

BibTeX

EndNote X3 XML

EndNote 7 XML

EndNote tagged

RIS
Weiterführende Links
Personenseiten

Teistler, Michael

Abteilung/Einrichtung

CIVU – Center for Interaction, Visualization and Usability

Fachbereich

Fachbereich 3: Information und Kommunikation
Filter Tags
2011

Journal Article

Oliver Bott

Klaus Dresing

Markus Wagner

Björn-Werner Raab

Michael Teistler

Publikationen

2012

Abstract

Exportformate

Filter Tags

Exportformate

Weiterführende Links

Filter Tags

Exportformate

Filter Tags

Abstract

Exportformate

Filter Tags

Abstract

Exportformate

Filter Tags

2011

Exportformate

Weiterführende Links

Filter Tags

Exportformate

Weiterführende Links

Filter Tags

Abstract

Exportformate

Weiterführende Links

Filter Tags

Abstract

Exportformate

Filter Tags

Abstract

Exportformate

Weiterführende Links

Filter Tags