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  1. Article ; Online: Growth-rate dependency of ribosome abundance and translation elongation rate in Corynebacterium glutamicum differs from that in Escherichia coli.

    Matamouros, Susana / Gensch, Thomas / Cerff, Martin / Sachs, Christian C / Abdollahzadeh, Iman / Hendriks, Johnny / Horst, Lucas / Tenhaef, Niklas / Tenhaef, Julia / Noack, Stephan / Graf, Michaela / Takors, Ralf / Nöh, Katharina / Bott, Michael

    Nature communications

    2023  Volume 14, Issue 1, Page(s) 5611

    Abstract: Bacterial growth rate (µ) depends on the protein synthesis capacity of the cell and thus on the number of active ribosomes and their translation elongation rate. The relationship between these fundamental growth parameters have only been described for ... ...

    Abstract Bacterial growth rate (µ) depends on the protein synthesis capacity of the cell and thus on the number of active ribosomes and their translation elongation rate. The relationship between these fundamental growth parameters have only been described for few bacterial species, in particular Escherichia coli. Here, we analyse the growth-rate dependency of ribosome abundance and translation elongation rate for Corynebacterium glutamicum, a gram-positive model species differing from E. coli by a lower growth temperature optimum and a lower maximal growth rate. We show that, unlike in E. coli, there is little change in ribosome abundance for µ <0.4 h
    MeSH term(s) Corynebacterium glutamicum/genetics ; Escherichia coli/genetics ; Ribosomes/genetics ; Polyribosomes ; Temperature
    Language English
    Publishing date 2023-09-12
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2553671-0
    ISSN 2041-1723 ; 2041-1723
    ISSN (online) 2041-1723
    ISSN 2041-1723
    DOI 10.1038/s41467-023-41176-y
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Book ; Online: Entwicklung und Produktion neuartiger Biopharmazeutika im Moos

    Cerff, Martin / Posten, Clemens

    Abschlussbericht ; Vorhabensbezeichnung (BioChancePlus-3) ; Laufzeit des Vorhabens: 01.09.2006 bis 31.05.2009

    2010  

    Author's details Clemens Posten; Martin Cerff
    Language German
    Size Online-Ressource (15 S., 973 KB), Ill., graph. Darst.
    Publisher Technische Informationsbibliothek u. Universitätsbibliothek ; Institut für Bio- und Lebensmitteltechnik, Bereich III, Bioverfahrenstechnik, Karlsruher Institut für Technologie (KIT)
    Publishing place Hannover ; Karlsruhe
    Document type Book ; Online
    Note Auch als gedr. Ausg. vorhanden ; Förderkennzeichen BMBF 0313852B. - Verbund-Nr. 01051114 ; Unterschiede zwischen dem gedruckten Dokument und der elektronischen Ressource können nicht ausgeschlossen werden
    Database Library catalogue of the German National Library of Science and Technology (TIB), Hannover

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  3. Book ; Online ; Thesis: In situ product recovery of extracellular proteins An integrated approach between cell physiology, bioreaction and magnetic separation

    Cerff, Martin [Verfasser]

    2012  

    Author's details Martin Cerff
    Keywords Technische Chemie ; Technical Chemistry
    Subject code sg660
    Language German
    Publisher Verlag Dr. Hut
    Publishing place München
    Document type Book ; Online ; Thesis
    ISBN 978-3-8439-0756-9 ; 3-8439-0756-0
    Database Digital theses on the web

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  4. Article ; Online: Enhancing the growth of Physcomitrella patens by combination of monochromatic red and blue light - a kinetic study.

    Cerff, Martin / Posten, Clemens

    Biotechnology journal

    2012  Volume 7, Issue 4, Page(s) 527–536

    Abstract: In the current work we demonstrate the relevance of monochromatic light conditions in moss plant cell culture. Light intensity and illumination wavelength are important cultivation parameters due to their impact on growth and chlorophyll formation ... ...

    Abstract In the current work we demonstrate the relevance of monochromatic light conditions in moss plant cell culture. Light intensity and illumination wavelength are important cultivation parameters due to their impact on growth and chlorophyll formation kinetics of the moss Physcomitrella patens. This moss was chosen as a model organism due to its capability to produce complex recombinant pharmaceutical proteins. Filamentous moss cells were cultivated in mineral medium in shaking flasks. The flasks were illuminated by light emitting diodes (LED) providing nearly monochromatic red and blue light as well as white light as a reference. A maximum growth rate of 0.78 day((1) was achieved under additional CO(2) aeration and no growth inhibition was observed under high light illumination. The application of dual red and blue light is the most effective way to reach high growth and chlorophyll formation rates while minimizing energy consumption of the LEDs. These observations are discussed as effects of photo sensory pigments in the moss. The combination of monochromatic red and blue light should be considered when a large scale process is set up.
    MeSH term(s) Bryopsida/growth & development ; Bryopsida/radiation effects ; Kinetics ; Light
    Language English
    Publishing date 2012-04
    Publishing country Germany
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2221885-3
    ISSN 1860-7314 ; 1860-6768
    ISSN (online) 1860-7314
    ISSN 1860-6768
    DOI 10.1002/biot.201100044
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article: Revisiting the Growth Modulon of

    Graf, Michaela / Haas, Thorsten / Teleki, Attila / Feith, André / Cerff, Martin / Wiechert, Wolfgang / Nöh, Katharina / Busche, Tobias / Kalinowski, Jörn / Takors, Ralf

    Frontiers in bioengineering and biotechnology

    2020  Volume 8, Page(s) 584614

    Abstract: Increasing the growth rate of the industrial ... ...

    Abstract Increasing the growth rate of the industrial host
    Language English
    Publishing date 2020-10-15
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2719493-0
    ISSN 2296-4185
    ISSN 2296-4185
    DOI 10.3389/fbioe.2020.584614
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Book: Entwicklung und Produktion neuartiger Biopharmazeutika im Moos

    Posten, Clemens / Cerff, Martin

    Abschlussbericht ; Vorhabensbezeichnung (BioChancePlus-3) ; Laufzeit des Vorhabens: 01.09.2006 bis 31.05.2009

    2010  

    Author's details Clemens Posten; Martin Cerff
    Language German
    Size 15 Bl., Ill., graph. Darst.
    Publisher Institut für Bio- und Lebensmitteltechnik, Bereich III, Bioverfahrenstechnik, Karlsruher Institut für Technologie (KIT)
    Publishing place Karlsruhe
    Document type Book
    Note Auch als elektronische Ressource vorh. ; Förderkennzeichen BMBF 0313852B. - Verbund-Nr. 01051114 ; Unterschiede zwischen dem gedruckten Dokument und der elektronischen Ressource können nicht ausgeschlossen werden
    Database Library catalogue of the German National Library of Science and Technology (TIB), Hannover

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  7. Article ; Online: In situ magnetic separation of antibody fragments from Escherichia coli in complex media.

    Cerff, Martin / Scholz, Alexander / Franzreb, Matthias / Batalha, Iris L / Roque, Ana Cecilia A / Posten, Clemens

    BMC biotechnology

    2013  Volume 13, Page(s) 44

    Abstract: Background: In situ magnetic separation (ISMS) has emerged as a powerful tool to overcome process constraints such as product degradation or inhibition of target production. In the present work, an integrated ISMS process was established for the ... ...

    Abstract Background: In situ magnetic separation (ISMS) has emerged as a powerful tool to overcome process constraints such as product degradation or inhibition of target production. In the present work, an integrated ISMS process was established for the production of his-tagged single chain fragment variable (scFv) D1.3 antibodies ("D1.3") produced by E. coli in complex media. This study investigates the impact of ISMS on the overall product yield as well as its biocompatibility with the bioprocess when metal-chelate and triazine-functionalized magnetic beads were used.
    Results: Both particle systems are well suited for separation of D1.3 during cultivation. While the triazine beads did not negatively impact the bioprocess, the application of metal-chelate particles caused leakage of divalent copper ions in the medium. After the ISMS step, elevated copper concentrations above 120 mg/L in the medium negatively influenced D1.3 production. Due to the stable nature of the model protein scFv D1.3 in the biosuspension, the application of ISMS could not increase the overall D1.3 yield as was shown by simulation and experiments.
    Conclusions: We could demonstrate that triazine-functionalized beads are a suitable low-cost alternative to selectively adsorb D1.3 fragments, and measured maximum loads of 0.08 g D1.3 per g of beads. Although copper-loaded metal-chelate beads did adsorb his-tagged D1.3 well during cultivation, this particle system must be optimized by minimizing metal leakage from the beads in order to avoid negative inhibitory effects on growth of the microorganisms and target production. Hereby, other types of metal chelate complexes should be tested to demonstrate biocompatibility. Such optimized particle systems can be regarded as ISMS platform technology, especially for the production of antibodies and their fragments with low stability in the medium. The proposed model can be applied to design future ISMS experiments in order to maximize the overall product yield while the amount of particles being used is minimized as well as the number of required ISMS steps.
    MeSH term(s) Bioreactors ; Copper/chemistry ; Culture Media/chemistry ; Escherichia coli ; Magnetics/methods ; Metals/chemistry ; Microspheres ; Models, Theoretical ; Single-Chain Antibodies/biosynthesis ; Single-Chain Antibodies/isolation & purification ; Triazines/chemistry
    Chemical Substances Culture Media ; Metals ; Single-Chain Antibodies ; Triazines ; Copper (789U1901C5)
    Language English
    Publishing date 2013-05-20
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ISSN 1472-6750
    ISSN (online) 1472-6750
    DOI 10.1186/1472-6750-13-44
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: Semi-continuous in situ magnetic separation for enhanced extracellular protease production-modeling and experimental validation.

    Cerff, Martin / Scholz, Alexander / Käppler, Tobias / Ottow, Kim E / Hobley, Tim J / Posten, Clemens

    Biotechnology and bioengineering

    2013  Volume 110, Issue 8, Page(s) 2161–2172

    Abstract: In modern biotechnology proteases play a major role as detergent ingredients. Especially the production of extracellular protease by Bacillus species facilitates downstream processing because the protease can be directly harvested from the biosuspension. ...

    Abstract In modern biotechnology proteases play a major role as detergent ingredients. Especially the production of extracellular protease by Bacillus species facilitates downstream processing because the protease can be directly harvested from the biosuspension. In situ magnetic separation (ISMS) constitutes an excellent adsorptive method for efficient extracellular protease removal during cultivation. In this work, the impact of semi-continuous ISMS on the overall protease yield has been investigated. Results reveal significant removal of the protease from Bacillus licheniformis cultivations. Bacitracin-functionalized magnetic particles were successfully applied, regenerated and reused up to 30 times. Immediate reproduction of the protease after ISMS proved the biocompatibility of this integrated approach. Six subsequent ISMS steps significantly increased the overall protease yield up to 98% because proteolytic degradation and potential inhibition of the protease in the medium could be minimized. Furthermore, integration of semi-continuous ISMS increased the overall process efficiency due to reduction of the medium consumption. Process simulation revealed a deeper insight into protease production, and was used to optimize ISMS steps to obtain the maximum overall protease yield.
    MeSH term(s) Bacillus/enzymology ; Bacillus/growth & development ; Bacillus/metabolism ; Biotechnology/methods ; Culture Media/chemistry ; Immunomagnetic Separation/methods ; Peptide Hydrolases/isolation & purification ; Peptide Hydrolases/metabolism
    Chemical Substances Culture Media ; Peptide Hydrolases (EC 3.4.-)
    Language English
    Publishing date 2013-08
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 280318-5
    ISSN 1097-0290 ; 0006-3592
    ISSN (online) 1097-0290
    ISSN 0006-3592
    DOI 10.1002/bit.24893
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article: Harvesting fresh water and marine algae by magnetic separation: Screening of separation parameters and high gradient magnetic filtration

    Cerff, Martin / Morweiser, Michael / Dillschneider, Robert / Michel, Aymeé / Menzel, Katharina / Posten, Clemens

    Bioresource technology. 2012 Aug., v. 118

    2012  

    Abstract: In this study, the focus is on magnetic separation of fresh water algae Chlamydomonas reinhardtii and Chlorella vulgaris as well as marine algae Phaeodactylum tricornutum and Nannochloropsis salina by means of silica-coated magnetic particles. Due to ... ...

    Abstract In this study, the focus is on magnetic separation of fresh water algae Chlamydomonas reinhardtii and Chlorella vulgaris as well as marine algae Phaeodactylum tricornutum and Nannochloropsis salina by means of silica-coated magnetic particles. Due to their small size and low biomass concentrations, harvesting algae by conventional methods is often inefficient and cost-consuming. Magnetic separation is a powerful tool to capture algae by adsorption to submicron-sized magnetic particles. Hereby, separation efficiency depends on parameters such as particle concentration, pH and medium composition. Separation efficiencies of >95% were obtained for all algae while maximum particle loads of 30 and 77g/g were measured for C. reinhardtii and P. tricornutum at pH 8 and 12, respectively. This study highlights the potential of silica-coated magnetic particles for the removal of fresh water and marine algae by high gradient magnetic filtration and provides critical discussion on future improvements.
    Keywords Chlamydomonas reinhardtii ; Chlorella vulgaris ; Phaeodactylum tricornutum ; adsorption ; filtration ; freshwater ; magnetic separation ; pH ; screening ; water harvesting
    Language English
    Dates of publication 2012-08
    Size p. 289-295.
    Publishing place Elsevier Ltd
    Document type Article
    ZDB-ID 1065195-0
    ISSN 1873-2976 ; 0960-8524
    ISSN (online) 1873-2976
    ISSN 0960-8524
    DOI 10.1016/j.biortech.2012.05.020
    Database NAL-Catalogue (AGRICOLA)

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  10. Article ; Online: Harvesting fresh water and marine algae by magnetic separation: screening of separation parameters and high gradient magnetic filtration.

    Cerff, Martin / Morweiser, Michael / Dillschneider, Robert / Michel, Aymeé / Menzel, Katharina / Posten, Clemens

    Bioresource technology

    2012  Volume 118, Page(s) 289–295

    Abstract: In this study, the focus is on magnetic separation of fresh water algae Chlamydomonas reinhardtii and Chlorella vulgaris as well as marine algae Phaeodactylum tricornutum and Nannochloropsis salina by means of silica-coated magnetic particles. Due to ... ...

    Abstract In this study, the focus is on magnetic separation of fresh water algae Chlamydomonas reinhardtii and Chlorella vulgaris as well as marine algae Phaeodactylum tricornutum and Nannochloropsis salina by means of silica-coated magnetic particles. Due to their small size and low biomass concentrations, harvesting algae by conventional methods is often inefficient and cost-consuming. Magnetic separation is a powerful tool to capture algae by adsorption to submicron-sized magnetic particles. Hereby, separation efficiency depends on parameters such as particle concentration, pH and medium composition. Separation efficiencies of >95% were obtained for all algae while maximum particle loads of 30 and 77 g/g were measured for C. reinhardtii and P. tricornutum at pH 8 and 12, respectively. This study highlights the potential of silica-coated magnetic particles for the removal of fresh water and marine algae by high gradient magnetic filtration and provides critical discussion on future improvements.
    MeSH term(s) Adsorption ; Aquatic Organisms/cytology ; Aquatic Organisms/isolation & purification ; Eukaryota/cytology ; Eukaryota/isolation & purification ; Filtration/methods ; Fresh Water ; Magnetics/methods ; Seawater ; Static Electricity ; Temperature
    Language English
    Publishing date 2012-08
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1065195-0
    ISSN 1873-2976 ; 0960-8524
    ISSN (online) 1873-2976
    ISSN 0960-8524
    DOI 10.1016/j.biortech.2012.05.020
    Database MEDical Literature Analysis and Retrieval System OnLINE

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