A5103188997- Aquaculture disease management and microbiota
- Aquaculture Nutrition and Growth
- Microbial Community Ecology and Physiology
- Gut microbiota and health
- Genomics and Phylogenetic Studies
- Wastewater Treatment and Nitrogen Removal
- Bacteriophages and microbial interactions
- Microbial bioremediation and biosurfactants
- Fish Ecology and Management Studies
- Atmospheric and Environmental Gas Dynamics
- Water Quality Monitoring Technologies
- Anaerobic Digestion and Biogas Production
- Marine Bivalve and Aquaculture Studies
- Petroleum Processing and Analysis
- Hydrocarbon exploration and reservoir analysis
- Oil Spill Detection and Mitigation
- Bacterial Genetics and Biotechnology
- Toxic Organic Pollutants Impact
- Aquatic life and conservation
- Pharmaceutical and Antibiotic Environmental Impacts
- Microbial Natural Products and Biosynthesis
- Multiferroics and related materials
- Invertebrate Immune Response Mechanisms
- RNA and protein synthesis mechanisms
- Ichthyology and Marine Biology
Norwegian University of Science and Technology
2016-2025
Norwegian University of Life Sciences
2010-2024
SINTEF
2023
University of Thessaly
2020
University of Oslo
2016-2020
Biosergen (Norway)
2008-2011
UiT The Arctic University of Norway
1999-2005
University of Colorado Boulder
1985
Summary Marine fish larvae are immature upon hatching, and share their environment with high numbers of bacteria. The microbial communities associated developing might be structured by other factors than those important in terrestrial animals. Here, we analysed the beta (β)‐diversity microbiota cod compared it bacterial water live feed applying pyrosequencing bar coded v4 16S rDNA amplicons. A total 15 phyla were observed larval microbiota. Proteobacteria was most abundant, followed...
We determined the gender of a variety cetacean species, including both ondotocetes and mysticetes, using polymerase chain reaction for amplification sex chromosome specific regions ZFY/ZFX SRY. This quick simple method requires extremely small amounts tissue, therefore allows to be from skin biopsies taken free-ranging specimens. In fin whale, Balaenoptera physalus, no gender-specific bands were observed when system was used, but SRY accurately determined. Previous studies in other mammals...
Several eukaryotic symbioses have shown to host a rich diversity of prokaryotes that interact with their hosts. Here, we study bacterial communities associated ectomycorrhizal root systems Bistorta vivipara compared in bulk soil using pyrosequencing 16S rRNA amplicons. A high richness Operational Taxonomic Units (OTUs) was found plant roots (3,571 OTUs) and surrounding (3,476 OTUs). The community composition differed markedly between these two environments. Actinobacteria, Armatimonadetes,...
The gastrointestinal (GI) tract of newly hatched fish is probably colonized by bacteria present in the water, but how environmental and internal factors affect development GI microbiota poorly understood. In this study, we investigated effect diet rearing separate tanks on cod larval microbiota. Cod larvae were fed three different live feed diets. For each diet, reared replicate tanks. microbial communities for individual using a PCR/DGGE (Denaturing Gradient Gel Electrophoresis) strategy....
A key challenge in recirculating aquaculture systems (RAS) is the accumulation of particulate organic matter, especially fine and colloidal fraction due to low removal efficiency today's technology. The supply matter typically limiting resource determining carrying capacity (CC) heterotrophic bacteria system. An appropriate stable CC proposed as a strategy for an optimal microbial environment RAS with less blooms opportunistic more community dynamics. In this study, we investigated effects...
Seasonal dynamics can vastly influence the natural depletion of oil spilled into ocean and Arctic regions are characterized by large seasonal changes, especially in temperature daylight. To determine influences variation on processes like dissolution, photooxidation biodegradation, we deployed thin films three oils seawater during summer winter Svalbard, Norway. The extent varied with season type oil, however, considerable n-alkanes polycyclic aromatic compounds were observed both winter....
ABSTRACT Polyene macrolide antibiotics, including nystatin and amphotericin B, possess fungicidal activity are being used as antifungal agents to treat both superficial invasive fungal infections. Due their toxicity, however, clinical applications relatively limited, new-generation polyene macrolides with an improved therapeutic index highly desirable. We subjected the polyol region of heptaene analogue S44HP biosynthetic engineering designed remove introduce hydroxyl groups in C-9-C-10...
The inducible Pm-xylS promoter system has proven useful for production of recombinant proteins in several gram-negative species and high-cell-density cultivations Escherichia coli. In this study we subjected a 24-bp region Pm (including the -10 element) to random mutagenesis, leading large mutant libraries E. Low-frequency-occurring mutants displaying strongly increased activity (up-mutants) could be efficiently identified by using beta-lactamase as reporter. up-mutants typically carried...
We examined the effect of ammonium and temperature on methane production in high rate upflow anaerobic sludge bed reactors treating pig manure supernatant. operated four at two concentrations ('low' 1.9, 'high' 3.7 g L-1, termed LA HA reactors, respectively) variable temperatures over 358 days. Archaeal bacterial communities were characterized by Illumina sequencing 16S rRNA amplicons. Ammonium was a major selective factor for archaeal community structure. After ~200 days adaptation to...
We have previously shown that K-selection and microbial stability in the rearing water increases survival growth of Atlantic cod (Gadus morhua) larvae, recirculating aquaculture systems (RAS) are compatible with this. Here, we assessed how treatment influenced larval microbiota host responses at gene expression level. Cod larvae were reared two different systems: a RAS flow-through system (FTS). The was examined using 16S rDNA PCR/DGGE strategy. RNA extracted from 8, 13, 17 days post...
Many studies demonstrate the importance of commensal microbiomes to animal health and development. However, initial community assembly process is poorly understood. It unclear what extent hosts select for their microbiota, whether stochastic processes contribute, how environmental conditions affect assembly. We investigated in Atlantic cod larvae exposed distinct microbial metacommunities. aimed quantify ecological influencing elucidate complex relationship between bacteria environment fish....
Summary Secondary structures and the short Shine–Dalgarno sequence in 5′‐untranslated region of bacterial mRNAs (UTR) are known to affect gene expression at level translation. Here we report use random combinatorial DNA libraries study UTR function, applying strong, σ 32 /σ 38 ‐dependent, positively regulated Pm promoter as a model. All mutations located least 8 bp downstream transcriptional start site. The were screened using ampicillin‐resistance ( bla ) reporter, allowing easy...
The study shows that high rate anaerobic digestion may be an efficient way to obtain sustainable energy recovery from slurries such as pig manure. High process capacity and robustness 5% daily load increases are observed in the 370 mL sludge bed AD reactors investigated. supernatant partly settled, stored manure was fed at rates giving hydraulic retention times, HRT, gradually decreased 42 1.7 h imposing a maximum organic of 400 g COD L(-1) reactor d(-1). reached biogas production 97 d(-1)...
The vertebrate gut is host to large communities of bacteria, and one the beneficial contributions this commensal microbiota increased nutritional gain from feed components that cannot degrade on its own. Fish larvae similar age under same rearing conditions often diverge with regards growth. underlying reasons for could be differences in genetic background, feeding behavior or digestive capacity. Both digestion can influenced by microbiota. To investigate possible correlations between size...