Helga Ertesvåg
73598678
Kjemi 3, 3-328, Gløshaugen, Sem Sælandsvg 6
Om
Eg er forskar og professor II ved Institutt for Bioteknologi og matvitenskap og tilknytta Nobipol. Forskinga mi er i skjeringspunktet mellom mikrobiologi, biokjemi og bioteknologi, og eg er med på både reine grunnforskingsprosjekt og industritilknytta prosjekt. Eg underviser delar av Biokjemi II og PhD-kurset BT8120.
Arbeidsområde:
- Forstå og kontrollere biosyntesen av alginat i Pseudomonas fluorescens og Azotobacter vinelandii
- Studere alginat-modifiserande enzym
- Lage enzym med nye eigenskapar.
- Utvikle mikroorganismer som kan lage ingrediensar til fiskefor med fokus på DHA og EPA
- Studere korleis surfaktantar, polysakkarid og protein produserte av bakteriar påverkar flyteevnen til små mineralpartiklar.
- Cystedanning i A. vinelandii
- Samlinga av Actinomycetar frå Trondheimsfjorden
Utdanning og arbeidserfaring
Cand Scient frå UNIT, AVH 1987, PhD frå same stad i 1994. Eg var tilsett i SINTEF frå 1987 til 2004 som forskar og seinare seniorforskar. I 2005 tok NTNU over denne delen av SINTEF, og eg har sidan vore ved NTNU som fast vitskapleg tilsett i rein forskarstilling. Dette har omfatta leiing av prosjekt og koordinering av forskingsgruppe.
Det faglege fokuset mitt er oftast industriell bioteknologi der målet har vore å få bakteriar og thraustochytridar til å lage ulike produkt (protein eller metabolittar) i industriell skala. I stor grad har dette vore samarbeidsprosjekt der min del har vore på stammeutviklingssida. Eg har no erfaring med arbeid i ulike bakterieartar, dette inkluderer kloning, homolog rekombinering og å skreddarsy verktøy til ulike organismer. Vidare har eg arbeidd med produksjon, reinsing og karakterisering av ulike protein. Prosjekta har også gjeve erfaring i å søkje i ulike databasar for å finne gen som kan kode for ein ønska aktivitet eller klargjere metabolske spor.
Anna
Eg er med i styret for Trondheimsgruppa for Tekna Biotek, og er dermed med på planlegging og arrangering av ulike faglege seminar
Forsking
Forskinga mi er i skjeringspunktet mellom mikrobiologi, biokjemi og bioteknologi, og eg er med på både reine grunnforskingsprosjekt og industritilknytta prosjekt. Det faglege fokuset mitt er oftast industriell bioteknologi der målet har vore å få bakteriar og thraustochytridar til å lage ulike produkt (protein eller metabolittar) i industriell skala. I stor grad har dette vore samarbeidsprosjekt der min del har vore på stammeutviklingssida. Eg har no erfaring med arbeid i ulike bakterieartar, dette inkluderer kloning, homolog rekombinering og å skreddarsy verktøy til ulike organismer. Vidare har eg arbeidd med produksjon, reinsing og karakterisering av ulike protein. Prosjekta har også gjeve erfaring i å søkje i ulike databasar for å finne gen som kan kode for ein ønska aktivitet eller klargjere metabolske spor.
- Forstå og kontrollere biosyntesen av alginat i Pseudomonas fluorescens og Azotobacter vinelandii
- Studere alginat-modifiserande enzym
- Lage enzym med nye eigenskapar.
- Utvikle mikroorganismer som kan lage ingrediensar til fiskefor med fokus på DHA og EPA
- Studere korleis surfaktantar, polysakkarid og protein produserte av bakteriar påverkar flyteevnen til små mineralpartiklar.
- Cystedanning i A. vinelandii
- Samlinga av Actinomycetar frå Trondheimsfjorden
Publikasjonar
2024
-
Ertesvåg, Helga.
(2024)
Natrium-kalium-pumpa.
Store Norske Leksikon (Nettutgaven)
Populærvitenskapelig artikkel
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
Vitenskapelig artikkel
-
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
Vitenskapelig oversiktsartikkel/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
Vitenskapelig artikkel
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
Vitenskapelig artikkel
-
Jain, Garima;
Ertesvåg, Helga.
(2022)
Improved site-specific mutagenesis in Rhodococcus opacus using a novel conditional suicide plasmid.
Applied Microbiology and Biotechnology
Fagartikkel
-
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
Vitenskapelig artikkel
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
Vitenskapelig artikkel
-
Rau, E-Ming;
Ertesvåg, Helga.
(2021)
Method Development Progress in Genetic Engineering of Thraustochytrids.
Marine Drugs
Vitenskapelig oversiktsartikkel/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
Vitenskapelig artikkel
-
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
Vitenskapelig artikkel
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)
Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
-
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
Vitenskapelig artikkel
-
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
Vitenskapelig artikkel
2019
-
Vilnes, Marte;
Ertesvåg, Helga.
(2019)
Genetisk modifisering av lipidmetabolismen i Rhodococcus opacus PD630.
NTNU
Mastergradsoppgave
-
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
Vitenskapelig artikkel
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
Vitenskapelig artikkel
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
Vitenskapelig oversiktsartikkel/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
Vitenskapelig artikkel
-
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
Vitenskapelig artikkel
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
Vitenskapelig artikkel
-
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
Vitenskapelig oversiktsartikkel/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
Vitenskapelig artikkel
2015
-
Ertesvåg, Helga.
(2015)
Alginate-modifying enzymes: Biological roles and biotechnological uses.
Frontiers in Microbiology
Vitenskapelig oversiktsartikkel/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
Vitenskapelig artikkel
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
Vitenskapelig artikkel
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
Vitenskapelig artikkel
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
Vitenskapelig artikkel
-
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
Vitenskapelig artikkel
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
Vitenskapelig artikkel
-
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
Mastergradsoppgave
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
Vitenskapelig artikkel
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
Vitenskapelig artikkel
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
Vitenskapelig artikkel
Tidsskriftspublikasjoner
-
Ertesvåg, Helga.
(2024)
Natrium-kalium-pumpa.
Store Norske Leksikon (Nettutgaven)
Populærvitenskapelig artikkel
-
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
Vitenskapelig artikkel
-
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
Vitenskapelig oversiktsartikkel/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
Vitenskapelig artikkel
-
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
Vitenskapelig artikkel
-
Jain, Garima;
Ertesvåg, Helga.
(2022)
Improved site-specific mutagenesis in Rhodococcus opacus using a novel conditional suicide plasmid.
Applied Microbiology and Biotechnology
Fagartikkel
-
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
Vitenskapelig artikkel
-
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
Vitenskapelig artikkel
-
Rau, E-Ming;
Ertesvåg, Helga.
(2021)
Method Development Progress in Genetic Engineering of Thraustochytrids.
Marine Drugs
Vitenskapelig oversiktsartikkel/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
Vitenskapelig artikkel
-
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
Vitenskapelig artikkel
-
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
Vitenskapelig artikkel
-
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
Vitenskapelig artikkel
-
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
Vitenskapelig artikkel
-
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
Vitenskapelig artikkel
-
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
Vitenskapelig oversiktsartikkel/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
Vitenskapelig artikkel
-
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
Vitenskapelig artikkel
-
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
Vitenskapelig artikkel
-
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
Vitenskapelig oversiktsartikkel/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
Vitenskapelig artikkel
-
Ertesvåg, Helga.
(2015)
Alginate-modifying enzymes: Biological roles and biotechnological uses.
Frontiers in Microbiology
Vitenskapelig oversiktsartikkel/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
Vitenskapelig artikkel
-
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
Vitenskapelig artikkel
-
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
Vitenskapelig artikkel
-
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
Vitenskapelig artikkel
-
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
Vitenskapelig artikkel
-
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
Vitenskapelig artikkel
-
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
Vitenskapelig artikkel
-
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
Vitenskapelig artikkel
-
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
Vitenskapelig artikkel
Del av bok/rapport
-
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)
Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
Rapport
-
Vilnes, Marte;
Ertesvåg, Helga.
(2019)
Genetisk modifisering av lipidmetabolismen i Rhodococcus opacus PD630.
NTNU
Mastergradsoppgave
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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
Mastergradsoppgave
Undervising
Emne
Formidling
2023
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Vitenskapelig foredragErtesvåg, 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
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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
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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
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Faglig foredragRau, 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
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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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Vitenskapelig foredragAasen, 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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Vitenskapelig foredragHeggeset, 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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Vitenskapelig foredragAasen, 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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Vitenskapelig foredragErtesvåg, 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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Vitenskapelig foredragAasen, 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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Vitenskapelig foredragVadstein, 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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Vitenskapelig foredragAasen, 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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Populærvitenskapelig foredragErtesvåg, 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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Vitenskapelig foredragMaleki, 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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Populærvitenskapelig foredragErtesvåg, Helga. (2014) Modifiserte mikroorganismer som nye kjelder til fóringrediensar. Tekna Biotek Havbruk – tilgang på fórråstoffer , Trondheim 2014-11-14 -
2013
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Vitenskapelig foredragTøndervik, 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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Vitenskapelig foredragErtesvåg, 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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Vitenskapelig foredragGimmestad, 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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Vitenskapelig foredragDegelmann, 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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Vitenskapelig foredragErtesvåg, 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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Vitenskapelig foredragGimmestad, 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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Vitenskapelig foredragErtesvåg, 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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Vitenskapelig foredragBjerkan, 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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Vitenskapelig foredragBjerkan, 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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Populærvitenskapelig foredragSvanem, 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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Vitenskapelig foredragErtesvåg, Helga; Valla, Svein. (1998) Mannuronan C-5-epimerasar kontrollerer eigenskapane til alginat. Polymer- og kolloidvitenskapelig vårmøte 1998 , [Mangler data]
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Vitenskapelig foredragSvanem, 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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Vitenskapelig foredragErtesvåg, 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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Vitenskapelig foredragErtesvåg, 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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Populærvitenskapelig foredragValla, 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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Vitenskapelig foredragErtesvåg, 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]