Helga Ertesvåg
+4773598678
Kjemi 3, 3-328, Gløshaugen, Sem Sælandsvg 6
About
I am a research professor and adjunct professor at the Department of Biotechnology and Food Science and Nobipol. My research has been focused on microbiology/biochemistry/biotechnology on industrial microorganisms, both basic and applied projects. I teach parts of Biochemistry II and the PhD course BT8120.
Areas of speciality
- Understand and control the biosynthesis of alginate in Pseudomonas fluorescens and Azotobacter vinelandii
- Studies of alginate-modifying enzymes
- Design enzymes with new properties.
- Develop microorganisms (bacteria and thraustochytrids) producing feed ingredients, especially DHA and EPA
- Study the effect of bacterially produced surfactants, proteins and polysaccharides on the floatability of nanosized mineral particles.
- A. vinelandii encystment
- The collection of Actinomycetes from the Trondheim fjord
- Tutoring master and PhD students
Background and expertise
I took my master degree in 1987, and PhD in 1994, both at the University of Trondheim, AVH. From 1987 to 2004 I was employed at SINTEF as a researcher/senior researcher. From 2005 I have been working at NTNU.
My work has been within industrial biotechnology. In most cases the motivation has been to understand the bacteria and the properties of pathways and enzymes in order to ultimately construct bacteria that may produce various products (proteins or metabolites) at levels sufficient for an industrial process. I now have expertise on cloning, homologous recombination and tailoring of genetic tools in different bacteria. Another aspect has been production, purification and characterization of enzymes. The projects have also involved genome mining and the use of other databases to find genes coding for a desired activity or to better understand metabolic pathways.
Research
My research has been focused on microbiology/biochemistry/biotechnology on industrial microorganisms, both basic and applied projects. My work has been within industrial biotechnology. In most cases the motivation has been to understand the bacteria and the properties of pathways and enzymes in order to ultimately construct bacteria that may produce various products (proteins or metabolites) at levels sufficent for an industrial process. I have now expertise on cloning, homologous recombination and tailoring of genetic tools in different bacteria. Another aspect has been production, purification and characterization of enzymes. the projects have also involved genome mining and the use of other databases to find genes coding for a desired activity or to better understand metbolic pathways.
- Understand and control the biosynthesis of alginate in Pseudomonas fluorescens and Azotobacter vinelandii
- Studies of alginate-modifying enzymes
- Design enzymes with new properties.
- Develop microorganisms (bacteria and thraustochytrids) producing feed ingredients, especially DHA and EPA
- Study the effect of bacterially produced surfactants, proteins and polysaccharides on the floatability of nanosized mineral particles.
- A. vinelandii encystment
- The collection of Actinomycetes from the Trondheim fjord
Publications
2024
-
Ertesvåg, Helga.
(2024)
Natrium-kalium-pumpa.
Store Norske Leksikon (Nettutgaven)
Popular scientific article
2023
-
Rau, E-Ming;
Aasen, Inga Marie;
Bartosova, Zdenka;
Bruheim, Per;
Ertesvåg, Helga.
(2023)
Utilizing lipidomics and fatty acid synthase inhibitors to explore lipid accumulation in two thraustochytrid species.
Algal Research
Academic article
-
Beenfeldt Petersen, Agnes;
Tøndervik, Anne;
Gaardløs, Margrethe;
Ertesvåg, Helga;
Sletta, Håvard;
Aachmann, Finn Lillelund.
(2023)
Mannuronate C-5 epimerases and their use in alginate modification.
Essays in Biochemistry
Academic literature review
-
Slabov, Vladislav;
Jain, Garima;
Chernyshova, Irina;
Kota, Hanumantha Rao;
Ertesvåg, Helga.
(2023)
Alginates as Green Flocculants for Metal Oxide Nanoparticles.
Transactions of the Indian Institute of Metals
Academic article
2022
-
Tøndervik, Anne;
Aune, Randi;
Degelmann, Adelheid;
Piontek, Michael;
Ertesvåg, Helga;
Skjåk-Bræk, Gudmund.
(2022)
Strain Construction and Process Development for Efficient Recombinant Production of Mannuronan C-5 Epimerases in Hansenula polymorpha.
Frontiers in Plant Science
Academic article
-
Jain, Garima;
Ertesvåg, Helga.
(2022)
Improved site-specific mutagenesis in Rhodococcus opacus using a novel conditional suicide plasmid.
Applied Microbiology and Biotechnology
Article in business/trade/industry journal
-
Rau, E-Ming;
Bartosova, Zdenka;
Kristiansen, Kåre Andre;
Aasen, Inga Marie;
Bruheim, Per;
Ertesvåg, Helga.
(2022)
Overexpression of two new acyl-CoA:diacylglycerol acyltransferase 2-like acyl-CoA:sterol acyltransferases enhanced squalene accumulation in Aurantiochytrium limacinum.
Frontiers in Microbiology
Academic article
2021
-
Gaardløs, Margrethe;
Heggeset, Tonje Marita Bjerkan;
Tøndervik, Anne;
Teze, David;
Svensson, Birte;
Ertesvåg, Helga.
(2021)
Mechanistic Basis for Understanding the Dual Activities of the
Bifunctional Azotobacter vinelandii Mannuronan C-5-Epimerase
and Alginate Lyase AlgE7.
Applied and Environmental Microbiology
Academic article
-
Rau, E-Ming;
Ertesvåg, Helga.
(2021)
Method Development Progress in Genetic Engineering of Thraustochytrids.
Marine Drugs
Academic literature review
-
Rau, E-Ming;
Aasen, Inga Marie;
Ertesvåg, Helga.
(2021)
A non-canonical Δ9-desaturase synthesizing palmitoleic acid identified in the thraustochytrid Aurantiochytrium sp. T66.
Applied Microbiology and Biotechnology
Academic article
-
Bartosova, Zdenka;
Ertesvåg, Helga;
Nyfløt, Eirin Lishaugen;
Kämpe, Kristoffer;
Aasen, Inga Marie;
Bruheim, Per.
(2021)
Combined Metabolome and Lipidome analyses for in-depth characterization of lipid accumulation in the DHA producing Aurantiochytrium sp. T66.
Metabolites
Academic article
2020
-
Jain, Garima;
Havskjold, Håkon;
Dhar, Priyanka;
Ertesvåg, Helga;
Chernyshova, Irina;
Kota, Hanumantha Rao.
(2020)
Green foam-based methods of mineral and ion separation.
American Chemical Society (ACS)
Academic chapter/article/Conference paper
-
Mærk, Mali;
Jakobsen, Øyvind Mejdell;
Sletta, Håvard;
Klinkenberg, Geir;
Tøndervik, Anne;
Ellingsen, Trond Erling.
(2020)
Identification of Regulatory Genes and Metabolic Processes Important for Alginate Biosynthesis in Azotobacter vinelandii by Screening of a Transposon Insertion Mutant Library.
Frontiers in Bioengineering and Biotechnology
Academic article
-
Gawin, Agnieszka Maria;
Tietze, Lisa;
Aarstad, Olav Andreas;
Aachmann, Finn Lillelund;
Brautaset, Trygve;
Ertesvåg, Helga.
(2020)
Functional characterization of three Azotobacter chroococcum alginate-modifying enzymes related to the Azotobacter vinelandii AlgE mannuronan C-5-epimerase family.
Scientific Reports
Academic article
2019
-
Vilnes, Marte;
Ertesvåg, Helga.
(2019)
Genetisk modifisering av lipidmetabolismen i Rhodococcus opacus PD630.
NTNU
Masters thesis
-
Heggeset, Tonje Marita Bjerkan;
Ertesvåg, Helga;
Liu, Bin;
Ellingsen, Trond Erling;
Vadstein, Olav;
Aasen, Inga Marie.
(2019)
Lipid and DHA-production in Aurantiochytrium sp. – Responses to nitrogen starvation and oxygen limitation revealed by analyses of production kinetics and global transcriptomes.
Scientific Reports
Academic article
2018
-
Moreno, Soledad;
Ertesvåg, Helga;
Valla, Svein;
Nunez, Cinthia;
Espín, Guadalupe;
Cocotl-Yanez, Miguel.
(2018)
RpoS controls the expression and the transport of the AlgE1-7 epimerases in Azotobacter vinelandii.
FEMS Microbiology Letters
Academic article
2017
-
Maleki, Susan;
Mærk, Mali;
Hrudikova, Radka;
Valla, Svein;
Ertesvåg, Helga.
(2017)
New insights into Pseudomonas fluorescens alginate biosynthesis relevant for the establishment of an efficient production process for microbial alginates.
New Biotechnology
Academic literature review
-
Ertesvåg, Helga;
Sletta, Håvard;
Senneset, Mona;
Sun, Yi-Qian;
Klinkenberg, Geir;
Konradsen, Therese Aursand.
(2017)
Identification of genes affecting alginate biosynthesis in Pseudomonas fluorescens by screening a transposon insertion library.
BMC Genomics
Academic article
-
Maleki, Susan;
Hrudikova, Radka;
Zotchev, Sergey;
Ertesvåg, Helga.
(2017)
Identification of a new phosphatase enzyme potentially involved in the sugar phosphate stress response in Pseudomonas fluorescens.
Applied and Environmental Microbiology
Academic article
2016
-
Moral, Cigdem Kivilcimdan;
Ertesvåg, Helga;
Sanin, F. Dilek.
(2016)
Guluronic acid content as a factor affecting turbidity removal potential of alginate.
Environmental Science and Pollution Research
Academic article
-
Aasen, Inga Marie;
Ertesvåg, Helga;
Heggeset, Tonje Marita Bjerkan;
Liu, Bin;
Brautaset, Trygve;
Vadstein, Olav.
(2016)
Thraustochytrids as production organisms for docosahexaenoic acid (DHA), squalene, and carotenoids.
Applied Microbiology and Biotechnology
Academic literature review
-
Maleki, Susan;
Almaas, Eivind;
Zotchev, Sergey;
Valla, Svein;
Ertesvåg, Helga.
(2016)
Alginate Biosynthesis Factories in Pseudomonas fluorescens
: Localization and Correlation with Alginate Production Level.
Applied and Environmental Microbiology
Academic article
2015
-
Ertesvåg, Helga.
(2015)
Alginate-modifying enzymes: Biological roles and biotechnological uses.
Frontiers in Microbiology
Academic literature review
-
Maleki, Susan;
Mærk, Mali;
Valla, Svein;
Ertesvåg, Helga.
(2015)
Mutational analyses of glucose dehydrogenase and glucose-6-phosphate dehydrogenase genes in Pseudomonas fluorescens reveal their effects on growth and alginate production.
Applied and Environmental Microbiology
Academic article
2014
-
Mærk, Mali;
Johansen, Jostein;
Ertesvåg, Helga;
Drabløs, Finn;
Valla, Svein.
(2014)
Safety in numbers: multiple occurrences of highly similar homologs among Azotobacter vinelandii carbohydrate metabolism proteins probably confer adaptive benefits.
BMC Genomics
Academic article
2010
-
Tøndervik, Anne;
Klinkenberg, Geir;
Aarstad, Olav Andreas;
Drabløs, Finn;
Ertesvåg, Helga;
Ellingsen, Trond Erling.
(2010)
Isolation of Mutant Alginate Lyases with Cleavage Specificity for Di-guluronic Acid Linkages.
Journal of Biological Chemistry
Academic article
2009
-
Setubal, Joao C.;
dos Santos, Patricia;
Goldman, Barry S.;
Ertesvåg, Helga;
Espín, Guadalupe;
Rubio, Luis M..
(2009)
Genome sequence of Azotobacter vinelandii, an obligate aerobe specialized to support diverse anaerobic metabolic processes.
Journal of Bacteriology
Academic article
-
Gimmestad, Martin;
Ertesvåg, Helga;
Heggeset, Tonje Marita;
Aarstad, Olav Andreas;
Svanem, Britt Iren Glærum;
Valla, Svein.
(2009)
Characterization of Three New Azotobacter vinelandii Alginate Lyases, One of Which Is Involved in Cyst Germination.
Journal of Bacteriology
Academic article
2006
-
Gimmestad, Martin;
Steigedal, Magnus;
Ertesvåg, Helga;
Moreno, Soledad;
Christensen, Bjørn Erik;
Espín, Guadalupe.
(2006)
Identification and characterization of an Azotobacter vinelandii type I secretion system responsible for export of the AlgE-Type mannuronan C-5-epimerases.
Journal of Bacteriology
Academic article
-
Mærk, Mali;
Valla, Svein;
Ertesvåg, Helga.
(2006)
Bioinformatisk analyse og genetisk modifisering av karbohydratmetabolismen i Pseudomonas fluorescens, med fokus på alginatsyntese fra glukose.
NTNU, Institutt for bioteknologi
Masters thesis
2005
-
Bakkevig, Karianne;
Sletta, Håvard;
Gimmestad, Martin;
Aune, Randi;
Ertesvåg, Helga;
Degnes, Kristin.
(2005)
Role of the Pseudomonas fluorescens alginate lyase (AlgL) in clearing the periplasm of alginates not exported to the extracellular environment.
Journal of Bacteriology
Academic article
2004
-
Bjerkan, Tonje Marita;
Bender, Carol;
Ertesvåg, Helga;
Drabløs, Finn;
Fakhr, Mohamed K.;
Preston, Lori A..
(2004)
The pseudomonas syringae genome encodes a combined mannuronan C-5-epimerase and O-acetylhydrolase, which strongly enhances the predicted gel-forming properties of alginates.
Journal of Biological Chemistry
Academic article
2003
-
Gimmestad, Martin;
Sletta, Håvard;
Ertesvåg, Helga;
Bakkevig, Karianne;
Jain, Sumita;
Suh, Sang-jin.
(2003)
The Pseudomonas fluorescens AlgG protein, but not its mannuronan C-5-epimerase activity, is needed fro alginate polymer formation.
Journal of Bacteriology
Academic article
Journal publications
-
Ertesvåg, Helga.
(2024)
Natrium-kalium-pumpa.
Store Norske Leksikon (Nettutgaven)
Popular scientific article
-
Rau, E-Ming;
Aasen, Inga Marie;
Bartosova, Zdenka;
Bruheim, Per;
Ertesvåg, Helga.
(2023)
Utilizing lipidomics and fatty acid synthase inhibitors to explore lipid accumulation in two thraustochytrid species.
Algal Research
Academic article
-
Beenfeldt Petersen, Agnes;
Tøndervik, Anne;
Gaardløs, Margrethe;
Ertesvåg, Helga;
Sletta, Håvard;
Aachmann, Finn Lillelund.
(2023)
Mannuronate C-5 epimerases and their use in alginate modification.
Essays in Biochemistry
Academic literature review
-
Slabov, Vladislav;
Jain, Garima;
Chernyshova, Irina;
Kota, Hanumantha Rao;
Ertesvåg, Helga.
(2023)
Alginates as Green Flocculants for Metal Oxide Nanoparticles.
Transactions of the Indian Institute of Metals
Academic article
-
Tøndervik, Anne;
Aune, Randi;
Degelmann, Adelheid;
Piontek, Michael;
Ertesvåg, Helga;
Skjåk-Bræk, Gudmund.
(2022)
Strain Construction and Process Development for Efficient Recombinant Production of Mannuronan C-5 Epimerases in Hansenula polymorpha.
Frontiers in Plant Science
Academic article
-
Jain, Garima;
Ertesvåg, Helga.
(2022)
Improved site-specific mutagenesis in Rhodococcus opacus using a novel conditional suicide plasmid.
Applied Microbiology and Biotechnology
Article in business/trade/industry journal
-
Rau, E-Ming;
Bartosova, Zdenka;
Kristiansen, Kåre Andre;
Aasen, Inga Marie;
Bruheim, Per;
Ertesvåg, Helga.
(2022)
Overexpression of two new acyl-CoA:diacylglycerol acyltransferase 2-like acyl-CoA:sterol acyltransferases enhanced squalene accumulation in Aurantiochytrium limacinum.
Frontiers in Microbiology
Academic article
-
Gaardløs, Margrethe;
Heggeset, Tonje Marita Bjerkan;
Tøndervik, Anne;
Teze, David;
Svensson, Birte;
Ertesvåg, Helga.
(2021)
Mechanistic Basis for Understanding the Dual Activities of the
Bifunctional Azotobacter vinelandii Mannuronan C-5-Epimerase
and Alginate Lyase AlgE7.
Applied and Environmental Microbiology
Academic article
-
Rau, E-Ming;
Ertesvåg, Helga.
(2021)
Method Development Progress in Genetic Engineering of Thraustochytrids.
Marine Drugs
Academic literature review
-
Rau, E-Ming;
Aasen, Inga Marie;
Ertesvåg, Helga.
(2021)
A non-canonical Δ9-desaturase synthesizing palmitoleic acid identified in the thraustochytrid Aurantiochytrium sp. T66.
Applied Microbiology and Biotechnology
Academic article
-
Bartosova, Zdenka;
Ertesvåg, Helga;
Nyfløt, Eirin Lishaugen;
Kämpe, Kristoffer;
Aasen, Inga Marie;
Bruheim, Per.
(2021)
Combined Metabolome and Lipidome analyses for in-depth characterization of lipid accumulation in the DHA producing Aurantiochytrium sp. T66.
Metabolites
Academic article
-
Mærk, Mali;
Jakobsen, Øyvind Mejdell;
Sletta, Håvard;
Klinkenberg, Geir;
Tøndervik, Anne;
Ellingsen, Trond Erling.
(2020)
Identification of Regulatory Genes and Metabolic Processes Important for Alginate Biosynthesis in Azotobacter vinelandii by Screening of a Transposon Insertion Mutant Library.
Frontiers in Bioengineering and Biotechnology
Academic article
-
Gawin, Agnieszka Maria;
Tietze, Lisa;
Aarstad, Olav Andreas;
Aachmann, Finn Lillelund;
Brautaset, Trygve;
Ertesvåg, Helga.
(2020)
Functional characterization of three Azotobacter chroococcum alginate-modifying enzymes related to the Azotobacter vinelandii AlgE mannuronan C-5-epimerase family.
Scientific Reports
Academic article
-
Heggeset, Tonje Marita Bjerkan;
Ertesvåg, Helga;
Liu, Bin;
Ellingsen, Trond Erling;
Vadstein, Olav;
Aasen, Inga Marie.
(2019)
Lipid and DHA-production in Aurantiochytrium sp. – Responses to nitrogen starvation and oxygen limitation revealed by analyses of production kinetics and global transcriptomes.
Scientific Reports
Academic article
-
Moreno, Soledad;
Ertesvåg, Helga;
Valla, Svein;
Nunez, Cinthia;
Espín, Guadalupe;
Cocotl-Yanez, Miguel.
(2018)
RpoS controls the expression and the transport of the AlgE1-7 epimerases in Azotobacter vinelandii.
FEMS Microbiology Letters
Academic article
-
Maleki, Susan;
Mærk, Mali;
Hrudikova, Radka;
Valla, Svein;
Ertesvåg, Helga.
(2017)
New insights into Pseudomonas fluorescens alginate biosynthesis relevant for the establishment of an efficient production process for microbial alginates.
New Biotechnology
Academic literature review
-
Ertesvåg, Helga;
Sletta, Håvard;
Senneset, Mona;
Sun, Yi-Qian;
Klinkenberg, Geir;
Konradsen, Therese Aursand.
(2017)
Identification of genes affecting alginate biosynthesis in Pseudomonas fluorescens by screening a transposon insertion library.
BMC Genomics
Academic article
-
Maleki, Susan;
Hrudikova, Radka;
Zotchev, Sergey;
Ertesvåg, Helga.
(2017)
Identification of a new phosphatase enzyme potentially involved in the sugar phosphate stress response in Pseudomonas fluorescens.
Applied and Environmental Microbiology
Academic article
-
Moral, Cigdem Kivilcimdan;
Ertesvåg, Helga;
Sanin, F. Dilek.
(2016)
Guluronic acid content as a factor affecting turbidity removal potential of alginate.
Environmental Science and Pollution Research
Academic article
-
Aasen, Inga Marie;
Ertesvåg, Helga;
Heggeset, Tonje Marita Bjerkan;
Liu, Bin;
Brautaset, Trygve;
Vadstein, Olav.
(2016)
Thraustochytrids as production organisms for docosahexaenoic acid (DHA), squalene, and carotenoids.
Applied Microbiology and Biotechnology
Academic literature review
-
Maleki, Susan;
Almaas, Eivind;
Zotchev, Sergey;
Valla, Svein;
Ertesvåg, Helga.
(2016)
Alginate Biosynthesis Factories in Pseudomonas fluorescens
: Localization and Correlation with Alginate Production Level.
Applied and Environmental Microbiology
Academic article
-
Ertesvåg, Helga.
(2015)
Alginate-modifying enzymes: Biological roles and biotechnological uses.
Frontiers in Microbiology
Academic literature review
-
Maleki, Susan;
Mærk, Mali;
Valla, Svein;
Ertesvåg, Helga.
(2015)
Mutational analyses of glucose dehydrogenase and glucose-6-phosphate dehydrogenase genes in Pseudomonas fluorescens reveal their effects on growth and alginate production.
Applied and Environmental Microbiology
Academic article
-
Mærk, Mali;
Johansen, Jostein;
Ertesvåg, Helga;
Drabløs, Finn;
Valla, Svein.
(2014)
Safety in numbers: multiple occurrences of highly similar homologs among Azotobacter vinelandii carbohydrate metabolism proteins probably confer adaptive benefits.
BMC Genomics
Academic article
-
Tøndervik, Anne;
Klinkenberg, Geir;
Aarstad, Olav Andreas;
Drabløs, Finn;
Ertesvåg, Helga;
Ellingsen, Trond Erling.
(2010)
Isolation of Mutant Alginate Lyases with Cleavage Specificity for Di-guluronic Acid Linkages.
Journal of Biological Chemistry
Academic article
-
Setubal, Joao C.;
dos Santos, Patricia;
Goldman, Barry S.;
Ertesvåg, Helga;
Espín, Guadalupe;
Rubio, Luis M..
(2009)
Genome sequence of Azotobacter vinelandii, an obligate aerobe specialized to support diverse anaerobic metabolic processes.
Journal of Bacteriology
Academic article
-
Gimmestad, Martin;
Ertesvåg, Helga;
Heggeset, Tonje Marita;
Aarstad, Olav Andreas;
Svanem, Britt Iren Glærum;
Valla, Svein.
(2009)
Characterization of Three New Azotobacter vinelandii Alginate Lyases, One of Which Is Involved in Cyst Germination.
Journal of Bacteriology
Academic article
-
Gimmestad, Martin;
Steigedal, Magnus;
Ertesvåg, Helga;
Moreno, Soledad;
Christensen, Bjørn Erik;
Espín, Guadalupe.
(2006)
Identification and characterization of an Azotobacter vinelandii type I secretion system responsible for export of the AlgE-Type mannuronan C-5-epimerases.
Journal of Bacteriology
Academic article
-
Bakkevig, Karianne;
Sletta, Håvard;
Gimmestad, Martin;
Aune, Randi;
Ertesvåg, Helga;
Degnes, Kristin.
(2005)
Role of the Pseudomonas fluorescens alginate lyase (AlgL) in clearing the periplasm of alginates not exported to the extracellular environment.
Journal of Bacteriology
Academic article
-
Bjerkan, Tonje Marita;
Bender, Carol;
Ertesvåg, Helga;
Drabløs, Finn;
Fakhr, Mohamed K.;
Preston, Lori A..
(2004)
The pseudomonas syringae genome encodes a combined mannuronan C-5-epimerase and O-acetylhydrolase, which strongly enhances the predicted gel-forming properties of alginates.
Journal of Biological Chemistry
Academic article
-
Gimmestad, Martin;
Sletta, Håvard;
Ertesvåg, Helga;
Bakkevig, Karianne;
Jain, Sumita;
Suh, Sang-jin.
(2003)
The Pseudomonas fluorescens AlgG protein, but not its mannuronan C-5-epimerase activity, is needed fro alginate polymer formation.
Journal of Bacteriology
Academic article
Part of book/report
-
Jain, Garima;
Havskjold, Håkon;
Dhar, Priyanka;
Ertesvåg, Helga;
Chernyshova, Irina;
Kota, Hanumantha Rao.
(2020)
Green foam-based methods of mineral and ion separation.
American Chemical Society (ACS)
Academic chapter/article/Conference paper
Report
-
Vilnes, Marte;
Ertesvåg, Helga.
(2019)
Genetisk modifisering av lipidmetabolismen i Rhodococcus opacus PD630.
NTNU
Masters thesis
-
Mærk, Mali;
Valla, Svein;
Ertesvåg, Helga.
(2006)
Bioinformatisk analyse og genetisk modifisering av karbohydratmetabolismen i Pseudomonas fluorescens, med fokus på alginatsyntese fra glukose.
NTNU, Institutt for bioteknologi
Masters thesis
Teaching
Courses
Outreach
2023
-
Academic lectureErtesvåg, Helga. (2023) Conditional suicide vectors for non-model bacteria. Norsk forening for Mikrobiologi NFM Annual Meeting 2023 , Stavanger 2023-09-14 - 2023-09-14
2021
-
PosterRau, E-Ming; Ertesvåg, Helga; Collier, Jackie L; Aasen, Inga Marie. (2021) A Novel Protein of the Thraustochytrid Aurantiochytrium sp. T66 Homologous to Δ12-desaturases Has Δ9- desaturase Activity and Synthesizes Palmitoleic Acid. American Society for Microbiology (ASM), Federation of Euro world microbe forum 2021 , Online 2021-06-20 - 2021-06-24
-
PosterJain, Garima; Ertesvåg, Helga. (2021) Construction and Use of a New Conditional Suicide Plasmid to Delete an Essential Gene for Mycolic Acid Biosynthesis in Rhodococcus opacus. ASM and FEMS WORLD MICROBE FORUM, ASM and FEMS collaboration , Online 2021-06-20 - 2021-06-24
2020
-
LectureRau, E-Ming; Ertesvåg, Helga. (2020) Project AUROMEGA: a fatty acid desaturase of Aurantiochytrium sp. T66. Centre for Digital Life Norway Digital Life 2020 , Virtual 2020-11-19 - 2020-11-19
2019
-
PosterErtesvåg, Helga; Haslene-Hox, Hanne; Aasen, Inga Marie; Almaas, Eivind; Bartosova, Zdenka; Heggeset, Tonje Marita Bjerkan. (2019) Industrial microbiology – 'omics methods and modelling as tools for process optimization . Digital Life Norway DigitalLife 2019 , Tromsø 2019-09-05 - 2019-09-06
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Academic lectureAasen, Inga Marie; Haslene-Hox, Hanne; Ertesvåg, Helga; Heggeset, Tonje Marita Bjerkan; Bruheim, Per. (2019) Fatty acid synthesis in Aurantiochytrium sp, revealed by analyses of growth and production kinetics and global proteomes. . First International Conference on Labyrinthulean Protists (ICoLP) , Kobe 2019-08-28 - 2019-08-30
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Academic lectureHeggeset, Tonje Marita Bjerkan; Ertesvåg, Helga; Liu, Bin; Aasen, Inga Marie. (2019) Genome annotation and transcriptome analysis of the lipid- and DHA-accumulating Aurantiochytrium sp. T66. KONAN GAKUEN First International Conference on Labyrinthulean Protists (ICoLP) , Kobe 2019-08-28 - 2019-08-30
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Academic lectureAasen, Inga Marie; Bartosova, Zdenka; Haslene-Hox, Hanne; Heggeset, Tonje Marita Bjerkan; Stafsnes, Marit Hallvardsdotter; Bruheim, Per. (2019) Elucidating lipid accumulation and DHA synthesis in Aurantiochytrium sp. strain T66 using -omics technologies. Norsk forening for Mikrobiologi NFM Meeting, Applied and Environmental Microbiology , Trondheim 2019-06-11 - 2019-06-12
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PosterHavskjold, Håkon; Jain, Garima; Dhar, Priyanka; Ertesvåg, Helga; Chernyshova, Irina; Kota, Hanumantha Rao. (2019) Toward sustainable recovery of Rare Earth Elements: Separation of CeO2 and Fe2O3 nanoparticles using biosurfactants . Norwegian NanoSymposium 2019 , Trondheim 2019-09-16 - 2019-09-17
2018
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Academic lectureErtesvåg, Helga; Heggeset, Tonje Marita Bjerkan; Liu, Bin; Aasen, Inga Marie. (2018) Lipid accumulation and DHA synthesis in Aurantiochytrium sp. T66, what is revealed by RNAseq?. Centre for Digital Life Norway Digital Life 2018 , Bergen 2018-03-20 - 2918-03-21
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Academic lectureAasen, Inga Marie; Ertesvåg, Helga; Heggeset, Tonje Marita Bjerkan; Vadstein, Olav; Sevgeli, Huseyin. (2018) Production of heterotrophic microorganisms for use as a source of long-chain omega3 fatty acids in aquafeed. Aqua 2018 – World Aquaculture Society Conference , Montpellier 2018-08-25 - 2018-08-29
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Academic lectureVadstein, Olav; Ertesvåg, Helga; Aasen, Inga Marie; Nymark, Marianne. (2018) Microbes as production organisms of DHA/EPA: The need for strain improvement . WAS/EAS AQUA 2018 , Montpellier 2018-09-25 - 2018-09-29
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Academic lectureAasen, Inga Marie; Ertesvåg, Helga; Heggeset, Tonje Marita Bjerkan; Vadstein, Olav; Broli, Gunn; Sevgeli, Huseyin. (2018) Heterotrofe mikroorganismer som kilde for omega3-fettsyrer i fiskefôr. Havbruk 2018 2018-04-18 - 2018-04-20
2017
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Popular scientific lectureErtesvåg, Helga. (2017) Biosyntese av omega-3 feittsyrer i Thraustochytridar. Biologer uten grenser BUG foredrag "Bærekraftig mat" , Trondheim 2017-04-28 - 2017-04-28
2015
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Academic lectureMaleki, Susan; Mærk, Mali; Hrudikova, Radka; Valla, Svein; Ertesvåg, Helga. (2015) In Pseudomonas fluorescens alginate production levels are determined by the available fructose 6-phosphate. Dept. Chemistry La Sapienza University of Rome 8th European Symposium on Biopolymers , Roma 2015-09-15 - 2015-09-18
2014
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Popular scientific lectureErtesvåg, Helga. (2014) Modifiserte mikroorganismer som nye kjelder til fóringrediensar. Tekna Biotek Havbruk – tilgang på fórråstoffer , Trondheim 2014-11-14 -
2013
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Academic lectureTøndervik, Anne; Aachmann, Finn Lillelund; Svanem, Britt Iren Glærum; Klinkenberg, Geir; Ellingsen, Trond Erling; Aarstad, Olav Andreas. (2013) Directed evolution, high throughput sceening and production of alginate-modifying enzymes with new and targeted properties. EPNOE and ACS 3rd EPNOE International Polysaccharide Conference , Nice 2013-10-21 - 2013-10-24
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PosterLale, Rahmi; Ünver, Deniz; Ertesvåg, Helga; Moghadam, Morteza Shojaei; Valla, Svein. (2013) Cold-adapted (psychrophilic) marine bacteria as expression hosts. MABIT Bioprosp_13 , Tromsø 2013-02-20 - 2013-02-22
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PosterErtesvåg, Helga. (2013) Azotobacter vinelandii encystment. Federation of European Microbiological Society FEMS 2013 5th congress of european microbiologists , Leipzig 2013-07-21 - 2013-07-25
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PosterMoral, Çiğdem Kıvılcımdan; Ertesvåg, Helga; Sanin, F. Dilek. (2013) USE OF POST-EPIMERIZED ALGINATE IN WATER TREATMENT. Istanbul International Solid Waste, Water and Wastewater Congress , Istanbul 2013-05-22 - 2013-05-24
2009
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PosterMærk, Mali; Ellingsen, Trond E.; Ertesvåg, Helga; Jakobsen, Øyvind M.; Klinkenberg, Geir; Sletta, Håvard. (2009) Bacterial alginate biosynthesis: New genes identified by high-throughput screening. 10th International Conference on Systems Biology , Stanford, California 2009-08-30 - 2009-09-04
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PosterMærk, Mali; Lien, Stina Katrine; Ertesvåg, Helga; Bruheim, Per; Valla, Svein. (2009) An Entner-Doudoroff pathway mutation in Pseudomonas fluorescens causes cell death during alginate production. Norsk Biokjemisk Selskap The Norwegian Biochemical Society 45th Contact Meeting , Røros 2009-01-29 - 2009-02-01
2008
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PosterErtesvåg, Helga; Mærk, Mali; Jakobsen, Øyvind M.; Vie, Ane Kjersti; Sletta, Håvard. (2008) Identification of genes involved in alginate production and encystment in Azotobacter vinelandii. 9th International Conference on Systems Biology , Gøteborg 2008-08-23 - 2008-08-27
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PosterMærk, Mali; Jakobsen, Øyvind M.; Ertesvåg, Helga; Sletta, Håvard; Klinkenberg, Geir; Ellingsen, Trond E.. (2008) New genes affecting alginate biosynthesis in Azotobacter vinelandii. FEBS 8th FEBS Young Scientist Forum "Cell Harmony" , Loutraki 2008-06-26 - 2008-06-28
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PosterMærk, Mali; Jakobsen, Øyvind M.; Ertesvåg, Helga; Sletta, Håvard; Klinkenberg, Geir; Ellingsen, Trond E.. (2008) New genes affecting alginate biosynthesis in Azotobacter vinelandii. FEBS og IUBMB 33rd FEBS Congress & 11th IUBMB Conference "Biochemistry of Cell Regulation" , Aten 2008-06-28 - 2008-07-03
2006
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Academic lectureErtesvåg, Helga. (2006) Azotobacter vinelandii cysts. CAMST National Conference on Microbial Sciences and Technology , Holmen Fjordhotell, Nesbru 2006-06-17 - 2006-06-19
2005
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PosterGimmestad, Martin; Steigedal, Magnus; Christensen, Bjørn Erik; Sletta, Håvard; Ellingsen, Trond E; Valla, Svein. (2005) Identification and characterization of an Azotobacter vinelandii Type I secretion system responsible for export of the AlgE-type mannuronan C5-epimerase. Dechema e.V. 2nd European Conference on Prokaryotic Genomes. PROKAGEN 2005 , Göttingen 2005-09-23 - 2005-09-26
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PosterErtesvåg, Helga; Sletta, Håvard; Bakkevig, Karianne; Degnes, Kristin F; Jørgensen, Hanne; Bakke, Ingrid. (2005) The use of inducible promoters to study the biosynthesisof alginate in Pseudomonas fluorescens. Pseudomonas 10th International Congress , Marseille 2005-08-27 - 2005-08-31
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Academic lectureGimmestad, Martin; Ertesvåg, Helga; Bergene, N.I.; Svanem, Britt Iren Glærum; Bjerkan, Tonje Marita; Valla, Svein. (2005) Characterization of alginate lyases from the alginate-producing bacteria Azotobacter vinelandii and Pseudomonas fluorescens. The Norwegian Biochemical Society The Norwegian Biochemical Society 41st Contact Meeting , Tromsø 2005-01-13 - 2005-01-16
2004
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Academic lectureDegelmann, A.; Sletta, Håvard; Ertesvåg, Helga; Valla, Svein; Onsøyen, E.; Piontek, M.. (2004) Secreted expression of a bacterial alginate epimerase in Hansenula polymorpha: pitfalls and solutions. Artes Biotechnology Industrial Microbiology and Biotechnology Meeting , Essen 2004-07-25 - 2004-07-29
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Academic lectureErtesvåg, Helga; Bakkevig, Kari Anne; Sletta, Håvard; Degnes, K.F.; Ellingsen, Trond Erling; Valla, Svein. (2004) The use of metabolic engineering to study the biosynthesis of alginate in Pseudomonas fluorescens. NOBIPOL, NTNU Marine Biopolymers , Trondheim 2004-06-27 - 2004-06-29
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Academic lectureGimmestad, Martin; Ertesvåg, Helga; Svanem, Britt Iren Glærum; Valla, Svein. (2004) Use of the Azotobacter vinelandii genome sequence. eller Gene mining in the Azotobacter vinelandii genome. Norsk Biokjemisk Selskap Vintermøte 2004 , Hafjell, Lillehammer 2004-01-15 - 2004-01-18
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Academic lectureErtesvåg, Helga; Valla, Svein. (2004) The use of metabolic engineering to study the biosynthesis of alginate in Pseudomonas fluorescens. NOBIPOL, NTNU Marine Biopolymers , Trondheim 2004-06-27 - 2004-06-29
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Academic lectureBjerkan, Tonje Marita; Bender, Carol; Ertesvåg, Helga; Drabløs, Finn; Fakhr, Mohamed K.; Preston, Lori A.. (2004) The Pseudomonas syringae genome encodes a combined Mannuronan C-5-epimerase and O-acetylhydrolase, which strongly enhances the predicted gel-forming properties of alginates. FUGE National Conference on Microbial Sciences and Technology , Nesbu 2004-08-29 - 2004-08-31
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PosterBjerkan, Tonje Marita; Rozeboom, H.J.; Kalk, K.H.; Ertesvåg, Helga; Valla, Svein; Dijkstra, B.W.. (2004) The crystal structure of the catalytic A-module of AlgE4, a mannuronan C-5 epimerase from Azotobacter vinelandii. NOBIPOL, NTNU Marine Biopolymers , Trondheim 2004-06-27 - 2004-06-29
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PosterGimmestad, Martin; Bakkevig, Kari Anne; Sletta, Håvard; Ertesvåg, Helga; Skjåk-Bræk, Gudmund; Ellingsen, Trond Erling. (2004) The Pseudomonas fluorescens AlgG protein, but not its mannuronan C-5 epimerase activity, is needed for alginate polymer formation. NOBIPOL, NTNU Marine Biopolymers , Trondheim 2004-06-27 - 2004-06-29
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PosterGimmestad, Martin; Ertesvåg, Helga; Svanem, Britt Iren Glærum; Valla, Svein. (2004) Characterisation of four novel alginate lyases from the alginate-producing bacteria Azotobacter vinelandii and Pseudomonas fluorescens. NOBIPOL, NTNU Marine Biopolymers , Trondheim 2004-06-27 - 2004-06-29
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PosterSvanem, Britt Iren Glærum; Steigedal, Magnus; Klinkenberg, Geir; Aakvik, Trine; Ertesvåg, Helga; Skjåk-Bræk, Gudmund. (2004) Creating mannuronan C-5 epimerases with new properties by directed enzyme evolution. NOBIPOL, NTNU Marine Biopolymers , Trondheim 2004-06-27 - 2004-06-29
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PosterGimmestad, Martin; Bakkevig, Kari Anne; Sletta, Håvard; Ertesvåg, Helga; Skjåk-Bræk, Gudmund; Ellingsen, Trond Erling. (2004) The Pseudomonas fluorescens AlgG protein, but not its mannuronan C-5-epimerase activity, is needed for alginate polymer formation. Norsk Biokjemisk Selskap Vintermøte 2004 , Hafjell, Lillehammer 2004-01-15 - 2004-01-18
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PosterSvanem, Britt Iren Glærum; Steigedal, Magnus; Klinkenberg, Geir; Ertesvåg, Helga; Skjåk-Bræk, Gudmund; Valla, Svein. (2004) Creating mannuronan C-5-epimerases with new properties by directed enzyme evolution. Norsk Biokjemisk Selskap Vintermøte 2004 , Hafjell, Lillehammer 2004-01-15 - 2004-01-18
2003
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PosterSvanem, B I G.; Steigedal, Magnus; Klinkenberg, Geir; Ertesvåg, Helga; Skjåk-Bræk, Gudmund; Valla, Svein. (2003) Creating mannuronan C-5-epimerases with new properties using directed enzyme evolution. 11th European Congress on Biotechnology , Basel, Switzerland 2003-08-29 -
2002
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Academic lectureBjerkan, Tonje Marita; Ertesvåg, Helga; Valla, Svein. (2002) Use of a conditional suicide vector to study the effect of AlgE7 on the encystment and germination of Azetobacter vinelandii. NBS kontaktmøte , Røros 2002-01-24 -
1998
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Popular scientific lectureSvanem, Britt Iren Glærum; Ertesvåg, Helga; Valla, Svein. (1998) Cloning and expression of the last three mannuronan C-5-epimerase genes of the algE-gene family of Azotobacter vinelandii. 34. Biokjemiske Kontaktmøte, NBS , Lillehammer hotell, Lillekammer.
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Academic lectureErtesvåg, Helga; Valla, Svein. (1998) Mannuronan C-5-epimerasar kontrollerer eigenskapane til alginat. Polymer- og kolloidvitenskapelig vårmøte 1998 , [Mangler data]
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Academic lectureSvanem, B I G.; Ertesvåg, Helga; Valla, Svein. (1998) Cloning and expression of the last three mannuronan C-5-epimerase genes of the algE-gene family of Azotobacter vinelandii. 34. Biokjemiske Kontaktmøte, NBS , Lillehammer hotell
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PosterErtesvåg, Helga; Høidal, Hilde Kristin; Valla, Svein. (1998) Characterization of the modular mannuronan C-5-epimerase AlgE1 from Azotobacter vinelandii. 8th International Symposium on the Genetics of Industrial Micro organisms , Jerusalem, Israel
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PosterErtesvåg, Helga; Høidal, Hilde K.; Valla, Svein. (1998) Characterization of the modular mannuronan C-5-epimerase AlgE1 from Azotobacter vinelandii. 8th International Symposium On The Genetics Of Industrial Microorganisms , Jerusalem, Israel
1997
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Academic lectureErtesvåg, Helga; Høidal, Hilde Kristin; Glærum, Britt Iren; Valla, Svein. (1997) Mannuronan C-5-epimerases from Azotobacter vinelandii. Biokjemiske kontaktmøte, NBS , Lillehammer
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Academic lectureErtesvåg, Helga; Høidal, Hilde Kristin; Glærum, Britt Iren; Valla, Svein. (1997) Mannuronan C-5-epimerases from Azotobacter vinelandii. INPEC-97, International Network of Protein Engineering Centres Annual Meeting , Lillehammer
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PosterErtesvåg, Helga; Høidal, Hilde Kristin; Valla, Svein. (1997) Mannuronan C-5-epimerases a family of modular proteins. 2nd Carbohydrate Bioengineering Meeting , La Rochelle
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Popular scientific lectureValla, Svein; Ertesvåg, Helga; Høidal, Hilde Kristin; Glærum, Britt Iren. (1997) How azotobacter vinelandii uses a family of mannuronan C-5-epimerases to control the physical properties of its alginate. Eurocarb 9 , Utrecht
1994
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Academic lectureErtesvåg, Helga; Doseth, B.; Larsen, Bjørn; Skjåk-Bræk, Gudmund; Høidal, Hilde; Hals, Ingrid. (1994) A family of genes encoding mannuronan C5-epimerase in Azotobacter vinelandii. 1st International Conference on Polysaccharide Engineering , [Mangler data]