A5001303242- Planetary Science and Exploration
- Spaceflight effects on biology
- Algal biology and biofuel production
- Space Exploration and Technology
- Photosynthetic Processes and Mechanisms
- Geology and Paleoclimatology Research
- Space Science and Extraterrestrial Life
- Marine and environmental studies
- Biocrusts and Microbial Ecology
- Isotope Analysis in Ecology
- Soil Geostatistics and Mapping
- Plant tissue culture and regeneration
- Methane Hydrates and Related Phenomena
- Geochemistry and Geologic Mapping
- Wastewater Treatment and Nitrogen Removal
- Skin Protection and Aging
- Phosphorus and nutrient management
- Scientific Computing and Data Management
- Plant-Microbe Interactions and Immunity
- Microbial Fuel Cells and Bioremediation
- Plant Virus Research Studies
- Paleontology and Stratigraphy of Fossils
- Constructed Wetlands for Wastewater Treatment
- Polar Research and Ecology
- Microbial Community Ecology and Physiology
University of Helsinki
2025
University of Turku
2014-2023
Georgia Institute of Technology
2014
Information Technology University
2014
Cyanobacteria and green algae harness solar energy to split water fix CO2. Under specific conditions, they are capable of photoproduction molecular hydrogen (H2). This study compares the light-energy-to-hydrogen-energy conversion efficiency (LHCE) in two heterocystous, N2-fixing cyanobacteria (wild-type Calothrix sp. strain 336/3 ΔhupL mutant Anabaena PCC 7120) sulfur-deprived alga, Chlamydomonas reinhardtii CC-124, after entrapment cells thin Ca2+-alginate films. The experiments, performed...
ABSTRACT Mycosporine‐like amino acids are water‐soluble secondary metabolites that protect photosynthetic microorganisms from ultraviolet radiation. Here, we present direct evidence for the production of these compounds in surface scums cyanobacteria along Baltic Sea coast. We collected 59 environmental samples southern coast Finland during summers 2021 and 2022 analysed them using high‐resolution liquid chromatography‐mass spectrometry. Our results revealed presence microbial sunscreens...
ABSTRACT We have investigated two approaches to enhance and extend H 2 photoproduction yields in heterocystous, N -fixing cyanobacteria entrapped thin alginate films. In the first approach, periodic CO supplementation was provided alginate-entrapped, N-deprived cells. deprivation led inhibition of photosynthetic activity vegetative cells attenuation production over time. Our results demonstrated that alginate-entrapped Δ hupL were considerably more sensitive high light intensity, deficiency,...
Surviving of crews during future missions to Mars will depend on reliable and adequate supplies essential life support materials, i.e. oxygen, food, clean water, fuel. The most economical sustainable (and in long term, the only viable) way provide these Martian bases is via bio-regenerative systems, by using local resources drive oxygenic photosynthesis. Selected cyanobacteria, grown adequately protective containment could serve as pioneer species produce sustaining substrates for higher...
We conducted an analog sampling expedition under simulated mission constraints to areas dominated by basaltic tephra of the Eldfell and Fimmvörðuháls lava fields (Iceland). Sites were selected be "homogeneous" at a coarse remote sensing resolution (10–100 m) in apparent color, morphology, moisture, grain size, with best-effort realism numbers locations replicates. Three different biomarker assays (counting nucleic-acid-stained cells via fluorescent microscopy, luciferin/luciferase assay for...
The carotenoid composition of the filamentous heterocystous N2-fixing cyanobacterium Calothrix sp. 336/3 was investigated under three conditions: in full medium (non-diazotrophic growth); absence combined nitrogen (diazotrophic and after long-term H2 photoproduction atmosphere). Anabaena PCC 7120 its ΔhupL mutant with disrupted uptake hydrogenase were used as reference strains. Analysis identified carotenoids enzymes involved carotenogenesis showed presence distinct biosynthetic pathways...
The search for signs of life on Mars and beyond is time consuming labor-intensive; hence, it critical to understand how design sampling strategies that can maximize the likelihood success. Two distinct analogue environments in Iceland were selected represent volcanic resurfacing glacial where characterization different biosignatures at various spatial scales (100 m, 10 1 cm) was performed. This study serves twofold purposes (1) understanding levels biosignature distributions these (2)...
Previously described transgenic tobacco lines express the full length infectious Tobacco mosaic virus (TMV) genome under 35S promoter (Siddiqui et al., 2007. Mol Plant Microbe Interact, 20: 1489–1494). Through their young stages these plants exhibit strong resistance against both endogenously expressed and exogenously inoculated TMV, but at age of about 7–8 weeks they break into TMV infection, with typical severe symptoms. Infections some other viruses (Potato Y, A, X) induce breaking lead...
To search more efficiently for a record of past life on Mars, it is critical to know where look and thus maximize the likelihood success. Large-scale site selection Mars 2020 mission has been completed, but small (meter 10 cm)-scale relationships microenvironments will not be known until rover reaches surface. Over 2 m transect at modern volcanic deposit flank Askja volcano in barren highlands Iceland, we compared two biological indicators (ATP activity 16SrRNA amplicon sequence composition)...