Blar i Brage NMBU på forfatter "Håvarstein, Leiv Sigve"
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A penicillin resistant Streptococcus pneumoniae in the making : characterizing resistance development and cell fitness after acquiring low-affinity penicillin-binding proteins and a mosaic MurM
Heggenhougen, Maria Victoria (Master thesis, 2019)Streptococcus pneumoniae is an important human pathogen, causing about 100 millions of cases of disease and 1 – 2 million deaths every year. The rapid evolution and spread of multiresistant strains threaten current antibiotic ... -
A qualitative assessment of the risks of transmission of microorganisms to humans resulting from the consumption of raw milk and raw cream in Norway. Panel for Biological Hazards, Norwegian Scientific Committee for Food Safety
Wasteson, Yngvild; Blom, Hans; Fossum, Kåre; Høiby, Ernst Arne; Narvhus, Judith; Håvarstein, Leiv Sigve; Kapperud, Georg; Lassen, Jørgen Fr; Lunestad, Bjørn Tore; Nesbakken, Truls; Rimstad, Espen; Robertson, Lucy; Skjerve, Eystein; Kruse, Hilde (VKM Report, Research report, 2006) -
A risk assessment of shiga toxin-producing Escherichia coli (STEC) in the Norwegian meat chain with emphasis on dry-cured sausages
Rimstad, Espen; Håvarstein, Leiv Sigve; Kapperud, Georg; Lassen, Jørgen Fredrik; Lunestad, Bjørn Tore; Nesbakken, Truls; Robertson, Lucy Jane; Skjerve, Eystein; Wasteson, Yngvild (VKM Report, Research report, 2007) -
Assessment of the potential risks associated with the proposed use of composted waste from the production of bacitracin as a soil additive. Opinion of the Panel on Biological Hazards
Kruse, Hilde; Håvarstein, Leiv Sigve; Kapperud, Georg; Lassen, Jørgen Fredrik; Lunestad, Bjørn Tore; Nesbakken, Truls; Rimstad, Espen; Robertson, Lucy; Skjerve, Eystein; Wasteson, Yngvild (VKM report;, Research report, 2005) -
Cell-shape regulation in Streptococcus pneumoniae : EloR/KhpA, a new regulatory pathway administering cellelongation
Winther, Anja Ruud (PhD Thesis;2020:36, Doctoral thesis, 2020)The oval shaped Streptococcus pneumoniae utilizes both septal and peripheral peptidoglycan (PG) synthesis in order to maintain its shape. The protein complexes responsible for synthesizing PG are called the elongasome and ... -
Characterization of Lactococcus garvieae from rainbow trout (Oncorhynchus mykiss) in Spain and Turkey
Nygaard, Anja (Master thesis, 2019)Lactococcus garvieae is an emerging pathogen that causes mortalities in various farmed fish species, resulting in significant economic losses in aquaculture worldwide. The Gram-positive bacteria is pathogenic to both ... -
Characterization of the penicillin-binding proteins in Streptococcus oralis Uo5
Fykse, Silja Kavlie (Master thesis, 2017)In the search for new antibiotics the mechanism behind cell division has been studied for decades. The extensive use of antibiotics has led to the development of resistant bacteria, a problem that has become a global threat. ... -
Class A PBPs have a distinct and unique role in the construction of the pneumococcal cell wall.
Straume, Daniel; Piechowiak, Katarzyna Wiaroslawa; Olsen, Silje; Stamsås, Gro Anita; Berg, Kari Helene; Kjos, Morten; Heggenhougen, Maria Victoria; Alcorlo, Martín; Hermoso, Juan A.; Håvarstein, Leiv Sigve (Peer reviewed; Journal article, 2020) -
Comments on: The opinion of the Agence française de sécurité sanitaire (Afssa) on changes to the control measures for sheep and goat herds in which a case of classical or atypical scrapie has been detected. Opinion of the Panel on Biological Hazards & Panel on Animal Health and Animal Welfare of the Norwegian Scientific Committee for Food Safety
Rimstad, Espen; Håvarstein, Leiv Sigve; Kapperud, Georg; Lassen, Jørgen Fredrik; Lunestad, Bjørn Tore; Nesbakken, Truls; Robertson, Lucy Jane; Skjerve, Eystein; Wasteson, Yngvild; Bøe, Knut Egil; Arnemo, Jon Martin; Braastad, Bjarne Olai; Fossum, Kåre; Hjeltnes, Brit Kristine; Håstein, Tore; Juell, Jon-Erik; Valle, Paul Steinar; Waagbø, Rune (VKM Report, Research report, 2007) -
CRISPR Interference for Rapid Knockdown of Essential Cell Cycle Genes in Lactobacillus plantarum.
Myrbråten, Ine Storaker; Wiull, Kamilla; Salehian, Zhian; Håvarstein, Leiv Sigve; Straume, Daniel; Mathiesen, Geir; Kjos, Morten (Journal article; Peer reviewed, 2019) -
Deteksjon og kvantitering av humant papillomavirus DNA i serum hos kvinner med og uten celleforandringer i livmorhalsen
Sandberg, Yvonne (Master thesis, 2017)Persisterende infeksjon med humant papillomavirus (HPV) kan føre til utvikling av celleforandringer i livmorhalsen og livmorhalskreft, som på verdensbasis forårsaker 270 000 dødsfall hvert år. Innføringen av screeningprogrammet ... -
Identification of pneumococcal proteins that are functionally linked to penicillin-binding protein 2b (PBP2b).
Straume, Daniel; Stamsås, Gro; Berg, Kari Helene; Salehian, Zhian; Håvarstein, Leiv Sigve (Journal article; Peer reviewed, 2016) -
Molecular mechanisms of pneumococcal fratricide
Eldholm, Vegard (PhD Thesis;2010:13, Doctoral thesis, 2010)The bacterium Streptococcus pneumoniae is endowed with the ability to take up naked DNA from the surroundings and recombine this DNA into the chromosome. This property, termed competence for natural genetic transformation, ... -
Nascent teichoic acids insertion into the cell wall directs the localization and activity of the major pneumococcal autolysin LytA.
Bonnet, Julie; Mortier-Barrière, Isabelle; Campo, Nathalie; Jacq, Maxime; Moriscot, Christine; Straume, Daniel; Berg, Kari Helene; Håvarstein, Leiv Sigve; Wong, Yung-Sing; Vernet, Thierry; Di Guilmi, Anne Marie (Journal article, 2018) -
Natural genetic transformation: development of a new genetic tool for Streptococcus thermophilus
Blomqvist, Trinelise (PhD Thesis;2010:16, Doctoral thesis, 2010)Lactic acid bacteria (LAB) have been used in fermentation of foods for hundreds or even thousands of years. During the last decade the genome sequences of a number of commercially important LAB species and strains have ... -
Overexpression of the fratricide immunity protein ComM leads to growth inhibition and morphological abnormalities in Streptococcus pneumoniae
Straume, Daniel; Stamsås, Gro Anita; Salehian, Zhian; Håvarstein, Leiv Sigve (Journal article; Peer reviewed, 2017)The important human pathogen Streptococcus pneumoniae is a naturally transformable species. When developing the competent state, it expresses proteins involved in DNA-uptake, DNA-processing and homologous recombination. ... -
Prevention of EloR/KhpA heterodimerization by introduction of site-specific amino acid substitutions renders the essential elongasome protein PBP2b redundant in Streptococcus pneumoniae
Winther, Anja Ruud; Kjos, Morten; Stamsås, Gro Anita; Håvarstein, Leiv Sigve; Straume, Daniel (Peer reviewed; Journal article, 2019) -
Purification and characterization of streptovoracin, a novel antibiotic produced by a Pseudomonas species isolated from the Oslo fjord
Nesdal, Malene Tidemann (Master thesis, 2019)Antibiotikaresistent Streptococcus pneumoniae er en av de 18 største bakterielle truslene verden står ovenfor. Bakterien er alene ansvarlig for oppunder 2 millioner dødsfall hvert år på verdensbasis. På grunn av stadig ... -
Regulation of expression, purification and structural determination of the cross-wall splitting protein PcsB in Streptococcus pneumoniae
Stamsås, Gro Anita (PhD Thesis;2015:8, Doctoral thesis, 2018-04-24)The human pathogen Streptococcus pneumoniae causes approximately 1.6 million deaths per year. Hence, it is of great concern that the bacterium`s resistance against antibiotics has increased dramatically in recent decades. ... -
Rensing og karakterisering av colwellicin, et antimikrobielt stoff isolert fra Shewanella colwelliana
Fonn, Jeanette Stenersen (Master thesis, 2020)Da antibiotika ble introdusert på markedet, gav det håp om at infeksiøse sykdommer kunne bli bekjempet en gang for alle. Denne optimismen ble etter hvert overskygget av et økende antibiotikaresistensproblem. Resistensproblemet ...