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Forsíða

Forsíða

Ólafur Sigmar Andrésson - Professor Emeritus

Ólafur Sigmar Andrésson

–

School of Engineering and Natural Sciences

Ólafur Sigmar Andrésson

Professor Emeritus

of Genetics.

Location
Askja / N-153
Email
osa [at] hi.is

Unit
Faculty of Life and Environmental Sciences
Website
https://uni.hi.is/osa/

Published works

2024

Increased biocrust cover and activity in the highlands of Iceland after five growing seasons of experimental warmingPlant and Soil

2023

Mycobiont-specific primers facilitate the amplification of mitochondrial small subunit ribosomal DNAMycoKeys
Symbiont-specific responses to environmental cues in a threesome lichen symbiosisMolecular Ecology

2022

Environmental change alters nitrogen fixation rates and microbial parameters in a subarctic biological soil crustOikos
Novel methods to characterise spatial distribution and enantiomeric composition of usnic acids in four Icelandic lichensPhytochemistry
Novel methods to characterise spatial distribution and enantiomeric composition of usnic acids in four Icelandic lichensPhytochemistry
Large differences in carbohydrate degradation and transport potential among lichen fungal symbiontsNature Communications

2021

Characterization of simple sequence repeat loci for Peltigera membranacea (lichenized Ascomycota) and its Nostoc photobiontLichenologist

2019

Faster nitrogen cycling and more fungal and root biomass in cold ecosystems under experimental warming: a meta‐analysisEcology
Fungi in liverwort-based biocrustIcelandic Agricultural Sciences
The lichen symbiosis re-viewed through the genomes of Cladonia grayi and its algal partner Asterochloris glomerataBMC Genomics

2018

Distinctive characters of Nostoc genomes in cyanolichensBMC Genomics

2016

A fast and inexpensive high-throughput protocol for isolating high molecular weight genomic DNA from lichensHerzogia
Two mutations in the vif gene of maedi-visna virus have different phenotypes, indicating more than one function of VifVirology
Fungal and cyanobacterial gene expression in a lichen symbiosisFungal Biology
Peltigera islandica, a new cyanolichen species in section Peltigera ('P. canina group')Lichenologist

2015

High-throughput sequencing in studies of lichen population biology

2014

Lichen-symbiotic cyanobacteria associated with Peltigera have an alternative vanadium-dependent nitrogen fixation systemEuropean Journal of Phycology
Effects of abiotic stressors on lutein production in the green microalga Dunaliella salinaMicrobial Cell Factories

2013

Metagenomic natural product discovery in lichen provides evidence for a family of biosynthetic pathways in diverse symbiosesProceedings of the National Academy of Sciences of the United States of America
Studies on Recombination Processes in two Chlamydomonas reinhardtii Endogenous Genes, NIT1 and ARG7Protist
Enhancement of carotenoid biosynthesis in the green microalga Dunaliella salina with light-emitting diodes and adaptive laboratory evolutionApplied Microbiology and Biotechnology

2012

Mitochondrial genomes from the lichenized fungi Peltigera membranacea and Peltigera malaceaFungal Biology
Expression of lec-1, a mycobiont gene encoding a galectin-like protein in the lichen Peltigera membranaceaSymbiosis
LEC-2, a highly variable lectin in the lichen Peltigera membranaceaSymbiosis
Regulation of carotenoid accumulation in Dunaliella salina by light-emitting diode lighting along with adaptive laboratory evolutionFEBS Journal

2009

Cloning and heterologous transcription of a polyketide synthase gene from the lichen Solorina croceaMycological Research

2008

Mutational analysis of a principal neutralization domain of visna/maedi virus envelope glycoproteinJournal of General Virology

2007

Optimization of heterologous production of the polyketide 6-MSA in Saccharomyces cerevisiaeBiotechnology and Bioengineering
Áhrif stökkbreytinga í hvarfstöð alkalísks fosfatasaRAUST - Tímarit um raunvísindi og stærðfræði
Duplicated sequence motif in the long terminal repeat of maedi-visna viras extends cell tropism and is associated with neurovirulenceJournal of Virology

2006

Fléttuverkfræði - Tilraunir til að betrumbæta lífið

2005

Mucosal vaccination with an attenuated maedi-visna virus cloneVaccine
Simultaneous mutations in CA and Vif of maedi-visna virus cause attenuated replication in macrophages and reduced infectivity in vivoJournal of Virology

2004

The vif gene of maedi-visna virus is essential for infectivity in vivo and in vitroVirology

2001

Microbes everywhere. CAFF (Conservation of Arctic Flora and Fauna)
Primary structure of cold-adapted alkaline phosphatase from a Vibrio sp. as deduced from the nucleotide gene sequenceBiochimica et Biophysica Acta - Protein Structure and Molecular Enzymology

2000

Clostridium perfringens beta-toxin forms multimeric transmembrane pores in human endothelial cellsMicrobial Pathogenesis
Heat-labile bacterial alkaline phosphatase from a marine Vibrio spEnzyme and Microbial Technology
The long terminal repeat is a determinant of cell tropism of maedi-visna virusJournal of General Virology
Cloning and heterologous expression of Solorina crocea pyrGCurrent Genetics

1999

Naturally occurring mutations within 39 amino acids in the envelope glycoprotein of maedi-visna virus alter the neutralization phenotypeJournal of Virology

1998

Immune response to recombinant visna virus Gag and Env precursor proteins synthesized in insect cellsVirus Research
Site-directed mutagenesis of Clostridium perfringens beta-toxinFEMS Microbiology Letters
Biological and genetic differences between lung- and brain-derived isolates of maedi-visna virusVirus Genes
Visna virus dUTPase is dispensable for neuropathogenicityJournal of Virology

1997

In vivo and in vitro infection with two different molecular clones of visna virusVirology

1996

ErratumFEMS Microbiology Letters

1995

Cloning and sequence analysis of the DNA ligase-encoding gene of rhodothermus marinus, and overproduction, purification and characterization of two thermophilic DNA ligasesGene
Expression and purification of Clostridium perfringens beta-toxin glutathione S-transferase fusion proteinFEMS Microbiology Letters

1994

Pathogenic Proviral Molecular Clone of Neurovirulent Visna VirusAnnals of the New York Academy of Sciences
Sequence Variation in the Envelope Gene and the LTR of Maedi‐Visna VirusAnnals of the New York Academy of Sciences
Renibacterium salmoninarum, the causative agent of bacterial kidney disease in salmonid fish, detected by nested reverse transcription-PCR of 16S rRNA sequencesApplied and Environmental Microbiology
The sequence of the single 16S rRNA gene of the thermophilic eubacterium Rhodothermus marinus reveals a distant relationship to the group containing Flexibacter, Bacteroides, and Cytophaga speciesJournal of Bacteriology

1993

Nucleotide sequence and biological properties of a pathogenic proviral molecular clone of neurovirulent visna virusVirology

1991

Human and ovine lentiviral infections comparedComparative Immunology, Microbiology and Infectious Diseases

1987

Subclasses of IgG from whalesDevelopmental and Comparative Immunology

1985

Leucine tRNA family of Escherichia coliJournal of Bacteriology
supN ochre suppressor gene in Escherichia coli codes for tRNA(Lys)Journal of Bacteriology

1983

DNA sequences of yeast H3 and H4 histone genes from two non-allelic gene sets encode identical H3 and H4 proteinsJournal of Molecular Biology

1980

Some properties of the ribosomal RNA methyltransferase encoded by ksgA and the polarity of ksgA transcriptionMGG Molecular & General Genetics
Genetic organization and restriction enzyme cleavage map of the ksgA-pdxA region of the Escherichia coli chromosomeMGG Molecular & General Genetics
Isolation and characterization of lambda transducing phages for the E. coli genes ksgA and pdxAMGG Molecular & General Genetics

1978

Mutations determining generalized resistance to aminoglycoside antibiotics in Escherichia coliMGG Molecular & General Genetics

1976

Deletions of ribosomal protein genes in Escherichia coli merodiploids heterozygous for resistance to streptomycin and spectinomycinMGG Molecular & General Genetics

Keywords for Specialisation:

the lichen symbiome. Bioactive compounds in lichens and their genes

Lichen genomics

Surrogate expression in bacteria and fungi

Molecular genetics

Genetic engineering

Cyanobacterial nitrogen fixation in association with lichens and mosses. Alternative nitrogenases in cyanobacteria