Athanasios Zervas
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View article: The diversity and abundance of chytrids on the Greenland Ice Sheet – new quantitative data
The diversity and abundance of chytrids on the Greenland Ice Sheet – new quantitative data Open
Zoosporic fungi of the Chytridiomycota phylum are lethal parasites of algae in Arctic freshwater and marine environments, and their presence has been confirmed as dominant fungi in various habitats on the Greenland Ice Sheet by amplicon se…
View article: Linking extreme light availability to cellular function in algae-dominated communities on the Greenland Ice Sheet
Linking extreme light availability to cellular function in algae-dominated communities on the Greenland Ice Sheet Open
Glacier ice algae of the streptophyte genus Ancylonema bloom on glaciers globally, including the Greenland Ice Sheet. These algae survive under extreme high light conditions in the summer, as well as under very low light or total darkness …
View article: The soil protists are affected by rhizocompartment and wheat variety, and co-occur with prokaryotes
The soil protists are affected by rhizocompartment and wheat variety, and co-occur with prokaryotes Open
Background and Aims: Soil protist communities and their interaction with prokaryotes in the rhizocompartment influence plant growth. However, the drivers of protist diversity and their co-occurrence with prokaryotic communities in dynamic …
View article: The encoded and expressed biosynthetic potential of Greenland Ice Sheet microbes
The encoded and expressed biosynthetic potential of Greenland Ice Sheet microbes Open
Supraglacial habitats of the Greenland Ice Sheet (GrIS) harbor active microbial communities. Microbes produce a plethora of natural products, which hold great promise in biotechnology. Understudied environments such as the Greenland Ice Sh…
View article: Physiological and metabolic effects of a transposon-mediated mutation in the glutamate synthase gene, gltB, of plant-beneficial, cytokinin-producing Pseudomonas hormoni G20-18T
Physiological and metabolic effects of a transposon-mediated mutation in the glutamate synthase gene, gltB, of plant-beneficial, cytokinin-producing Pseudomonas hormoni G20-18T Open
Pseudomonas species are well-studied Gram-negative bacteria involved in plant-microbe interactions, particularly in the rhizosphere and phyllosphere, where they enhance plant growth and resilience under stress. A key trait of these bacteri…
View article: Small sample amounts from rhizosphere of barley maintain microbial community structure and diversity revealed by total RNA sequencing
Small sample amounts from rhizosphere of barley maintain microbial community structure and diversity revealed by total RNA sequencing Open
Total RNA sequencing is a crucial technique in microbial ecology for profiling active microbial communities in various environments, including the rhizosphere. Since total RNA sequencing yields both 16 S and 18 S ribosomal RNA (rRNA), it i…
View article: Survival strategies of supraglacial algae-dominated communities in the transition from high light to continual darkness on the Greenland Ice Sheet
Survival strategies of supraglacial algae-dominated communities in the transition from high light to continual darkness on the Greenland Ice Sheet Open
Glacier ice algae of the streptophyte genus Ancylonema live on glaciers globally, including the Greenland Ice Sheet, and bloom despite low temperatures, low nutrient availability, and very high light intensities. In polar regions, the long…
View article: Environmental risk assessment at the microbial level: utilizing total RNA sequencing to evaluate the non-target impact of biochemicals in agriculture
Environmental risk assessment at the microbial level: utilizing total RNA sequencing to evaluate the non-target impact of biochemicals in agriculture Open
The use of biochemicals in agriculture has become crucial to meeting the global demand for food production. Agrochemicals, such as fertilizers and pesticides, are widely applied to enhance crop efficiency. Additionally, other chemicals lik…
View article: TotalRNA sequencing reveals active community and functional dynamics on the surface of the Greenland Ice Sheet
TotalRNA sequencing reveals active community and functional dynamics on the surface of the Greenland Ice Sheet Open
The ablation area of the Greenland Ice Sheet (GrIS) is a biome driven by microbial activity. During the summer melt season, the weathering crust of the ice becomes a wet living skin dominated by eukaryotic glacier ice algae, particularly A…
View article: Isolation and characterization of potentially pathogenic bacteria from mountainous regions in France
Isolation and characterization of potentially pathogenic bacteria from mountainous regions in France Open
Introduction:High-altitude snowy regions are recognized as unique biomes hosting diverse microbial communities. Microorganisms in these environments have evolved adaptations to survive extreme conditions, such as low temperatures, high UV …
View article: Cold-Active Starch-Degrading Enzymes from a Cold and Alkaline Greenland Environment: Role of Ca2+ Ions and Conformational Dynamics in Psychrophilicity
Cold-Active Starch-Degrading Enzymes from a Cold and Alkaline Greenland Environment: Role of Ca2+ Ions and Conformational Dynamics in Psychrophilicity Open
Cold-active enzymes hold promise for energy-efficient processes. Amylases are widely used in household and industrial applications, but only a few are cold-active. Here we describe three novel secreted amylases, Rho13, Ika2 and I3C6, all f…
View article: Cold-Active Starch-Degrading Enzymes from a Cold and Alkaline Greenland Environment: Role of Ca<sup>2+</sup> Ions and Conformational Dynamics in Psychrophilicity
Cold-Active Starch-Degrading Enzymes from a Cold and Alkaline Greenland Environment: Role of Ca<sup>2+</sup> Ions and Conformational Dynamics in Psychrophilicity Open
Cold-active enzymes hold promise in energy-efficient processes. Amylases are widely used in household and industrial applications, but only a few are cold-active. Here we describe three novel secreted amylases Rho13, Ika2 and I3C6, all fro…
View article: New insights into RNA mycoviruses of fungal pathogens causing Fusarium head blight
New insights into RNA mycoviruses of fungal pathogens causing Fusarium head blight Open
Fusarium head blight (FHB) continues to be a major problem in wheat production and is considered a disease complex caused by several fungal pathogens including Fusarium culmorum, F. graminearum and F. equiseti. With the objective of invest…
View article: Total RNA analysis of the active microbiome on moving bed biofilm reactor carriers under incrementally increasing micropollutant concentrations
Total RNA analysis of the active microbiome on moving bed biofilm reactor carriers under incrementally increasing micropollutant concentrations Open
Micropollutants are increasingly prevalent in the aquatic environment. A major part of these originates from wastewater treatment plants since traditional treatment technologies do not remove micropollutants sufficiently. Moving bed biofil…
View article: Long-Read–Based Hybrid Genome Assembly and Annotation of Snow Algal Strain CCCryo 101-99 (cf. <i>Sphaerocystis</i> sp., Chlamydomonadales)
Long-Read–Based Hybrid Genome Assembly and Annotation of Snow Algal Strain CCCryo 101-99 (cf. <i>Sphaerocystis</i> sp., Chlamydomonadales) Open
Polar regions harbor a diversity of cold-adapted (cryophilic) algae, which can be categorized into psychrophilic (obligate cryophilic) and cryotrophic (nonobligate cryophilic) snow algae. Both can accumulate significant biomasses on glacie…
View article: Metagenomic exploration of cold‐active enzymes for detergent applications: Characterization of a novel, cold‐active and alkali‐stable <scp>GH8</scp> endoglucanase from ikaite columns in <scp>SW</scp> Greenland
Metagenomic exploration of cold‐active enzymes for detergent applications: Characterization of a novel, cold‐active and alkali‐stable <span>GH8</span> endoglucanase from ikaite columns in <span>SW</span> Greenland Open
Microbial communities from extreme environments are largely understudied, but are essential as producers of metabolites, including enzymes, for industrial processes. As cultivation of most microorganisms remains a challenge, culture‐indepe…
View article: Giant viral signatures on the Greenland ice sheet
Giant viral signatures on the Greenland ice sheet Open
Background Dark pigmented snow and glacier ice algae on glaciers and ice sheets contribute to accelerating melt. The biological controls on these algae, particularly the role of viruses, remain poorly understood. Giant viruses, classified …
View article: Investigating eukaryotic and prokaryotic diversity and functional potential in the cold and alkaline ikaite columns in Greenland
Investigating eukaryotic and prokaryotic diversity and functional potential in the cold and alkaline ikaite columns in Greenland Open
The ikaite columns in the Ikka Fjord, SW Greenland, represent a permanently cold and alkaline environment known to contain a rich bacterial diversity. 16S and 18S rRNA gene amplicon and metagenomic sequencing was used to investigate the mi…
View article: Distinct anoxygenic phototrophic lifestyles on the Greenland Ice Sheet expand the light harvesting community during microbial summer blooms on ice surfaces
Distinct anoxygenic phototrophic lifestyles on the Greenland Ice Sheet expand the light harvesting community during microbial summer blooms on ice surfaces Open
Aerobic anoxygenic photosystems, identified within specific bacterial clades, have been described recently as pivotal components influencing the carbon cycle in ocean surface waters. These pigmented bacteria exhibit diverse life strategies…
View article: Complete genome sequence of “Bacillaceae sp. strain IKA-2”: a cold-active, amylase-producing bacterium from ikaite columns in SW Greenland
Complete genome sequence of “Bacillaceae sp. strain IKA-2”: a cold-active, amylase-producing bacterium from ikaite columns in SW Greenland Open
Bacillaceae sp. strain IKA-2 is a bacterium isolated from the permanently cold and alkaline ikaite columns in the Ikka Fjord in SW Greenland (61°12'05″N; 48°00'50″W). The bacterium grows well at 10°C in a substrate buffered to pH 10. It ha…
View article: The undiscovered biosynthetic potential of the Greenland Ice Sheet microbiome
The undiscovered biosynthetic potential of the Greenland Ice Sheet microbiome Open
The Greenland Ice Sheet is a biome which is mainly microbially driven. Several different niches can be found within the glacial biome for those microbes able to withstand the harsh conditions, e.g., low temperatures, low nutrient condition…
View article: The Undiscovered Biosynthetic Potential of the Greenland Ice Sheet Microbiome
The Undiscovered Biosynthetic Potential of the Greenland Ice Sheet Microbiome Open
The Greenland Ice Sheet is a biome primarily driven by microbial activity. Despite the harsh conditions, such as cold temperatures, low nutrient levels, high UV radiation in summer, and long dark winters, various niches can be found on the…
View article: Abrupt permafrost thaw triggers activity of copiotrophs and microbiome predators
Abrupt permafrost thaw triggers activity of copiotrophs and microbiome predators Open
Permafrost soils store a substantial part of the global soil carbon and nitrogen. However, global warming causes abrupt erosion and gradual thaw, which make these stocks vulnerable to microbial decomposition into greenhouse gases. Here, we…
View article: Exploring microbial diversity in Greenland Ice Sheet supraglacial habitats through culturing-dependent and -independent approaches
Exploring microbial diversity in Greenland Ice Sheet supraglacial habitats through culturing-dependent and -independent approaches Open
The microbiome of Greenland Ice Sheet supraglacial habitats is still underinvestigated, and as a result there is a lack of representative genomes from these environments. In this study, we investigated the supraglacial microbiome through a…
View article: Metagenomes reveal purple non-sulfur bacteria linked to bare ice habitats on the Greenland Ice Sheet
Metagenomes reveal purple non-sulfur bacteria linked to bare ice habitats on the Greenland Ice Sheet Open
Phototrophic organisms blooming during the summer melt season on snow and ice surfaces are dominated by eukaryotic green algae (Chlorophytes and Streptophytes, respectively), with Cyanobacteria restricted to cryoconite habitats. However, t…