Search results for "bakteeri"

Honeybees affect floral microbiome composition in a central food source for wild pollinators in boreal ecosystems

2021

AbstractBasic knowledge on dispersal of microbes in pollinator networks is essential for plant, insect, and microbial ecology. Thorough understanding of the ecological consequences of honeybee farming on these complex plant–pollinator–microbe interactions is a prerequisite for sustainable honeybee keeping. Most research on plant–pollinator–microbe interactions have focused on temperate agricultural systems. Therefore, information on a wild plant that is a seasonal bottleneck for pollinators in cold climate such as Salix phylicifolia is of specific importance. We investigated how floral visitation by insects influences the community structure of bacteria and fungi in Salix phylicifolia inflo…

Bacteriophage Adherence to Mucus Mediates Preventive Protection against Pathogenic Bacteria

2019

The mucosal surfaces of animals are habitat for microbes, including viruses. Bacteriophages—viruses that infect bacteria—were shown to be able to bind to mucus. This may result in a symbiotic relationship in which phages find bacterial hosts to infect, protecting the mucus-producing animal from bacterial infections in the process. Here, we studied phage binding on mucus and the effect of mucin on phage-bacterium interactions. The significance of our research is in showing that phage adhesion to mucus results in preventive protection against bacterial infections, which will serve as basis for the development of prophylactic phage therapy approaches. Besides, we also reveal that exposure to m…

Lake restoration influences nutritional quality of algae and consequently Daphnia biomass

2020

AbstractFood quality is one of the key factors influencing zooplankton population dynamics. Eutrophication drives phytoplankton communities toward the dominance of cyanobacteria, which means a decrease in the availability of sterols and long-chain polyunsaturated fatty acids (EPA and DHA). The effects of different restoration measures on the nutritional quality of the phytoplankton community and subsequent impacts on zooplankton biomass have rarely been considered. We analyzed the nutritional quality of phytoplankton in the eutrophic Lake Vesijärvi in southern Finland over a 37-year period, and studied the impacts of two restoration measures, biomanipulation and hypolimnetic aeration, on th…

Rodent host population dynamics drive zoonotic Lyme Borreliosis and Orthohantavirus infections in humans in Northern Europe

2021

Zoonotic diseases, caused by pathogens transmitted between other vertebrate animals and humans, pose a major risk to human health. Rodents are important reservoir hosts for many zoonotic pathogens, and rodent population dynamics affect the infection dynamics of rodent-borne diseases, such as diseases caused by hantaviruses. However, the role of rodent population dynamics in determining the infection dynamics of rodent-associated tick-borne diseases, such as Lyme borreliosis (LB), caused by Borrelia burgdorferi sensu lato bacteria, have gained limited attention in Northern Europe, despite the multiannual abundance fluctuations, the so-called vole cycles, that characterise rodent population d…

Effective killing of Borrelia burgdorferi in vitro with novel herbal compounds

2018

Introduction: The tick-borne disease Lyme Borreliosis is caused by Borrelia bacteria. The disease can persist even after treatment with antibiotics, which is why other methods of treatment are needed. Herbal compounds and phytochemicals have been recently examined in relation to eradicating Borrelia bacteria in vitro. Objective: The possible antimicrobial effect of two novel compounds, Biocidin Liquid and LSF Broad-Spectrum Liposomal formulas, was examined in the hopes of discovering an alternative method for eradication of Borrelia bacteria. Methods: The minimum inhibitory concentrations (MICs) and minimum bacterial deaths (MBDs), as well as, time-kill effect of each compound were utilize…

Counteracting the horizontal spread of bacterial antibiotic resistance with conjugative plasmid-dependent bacteriophages

2016

Suomalaisessa siipikarjassa ja tarhariistalinnuissa todettujen Brachyspira-suvun bakteereiden karakterisointia

2006

The effect of environmental fluctuations on the invasion success of bacterial invader Serratia marcescens

2017

Ilmastonmuutoksen on odotettu lisäävän ympäristöolosuhteissa tapahtuvien vaihteluiden määrää. Teorian mukaan nämä vaihtelut voisivat lisätä vieraslajien levittäytymistä uusille alueille, mikäli ne vaikuttavat ekologisiin ja evolutiivisiin prosesseihin, jotka tekevät lajeista menestyksekkäitä vieraslajeja sekä paikallisista eliöyhteisöistä ja ympäristöistä alttiimpia levittäytymiselle. Häiriöherkkien alueiden on oletettu olevan otollisia levittäytymiselle, minkä lisäksi vieraslajit ovat voineet valmiiksi sopeutua sietämään vaihtelevia olosuhteita alkuperäisalueellaan. Nopeasti vaihtelevissa ympäristöolosuhteissa luonnonvalinta voi suosia ominaisuuksia, kuten generalismia, joka auttaa eliöitä…

Flavobacterium columnare in Finnish fish farming : characterisation and putative disease management strategies

2005

Lotta-Riina Suomalainen selvitti väitöskirjatyössään syitä flavobakteeritaudin lisääntymiselle. Flavobacterium columnare -bakteerin aiheuttama kalakuolleisuus on vakava uhka suomalaiselle poikaskalan tuotannolle. Flavobakteeri-infektiot muodostavat suurimman osan kalanviljelyssä diagnostisoiduista tautitapauksista ja niiden haitta elinkeinolle on merkittävä. Flavobacterium columnare -bakteeri aiheuttaa kalanpoikasille vakavia kidus- ja ihotulehduksia. Tappiot kalanviljelijälle ovat mittavat, sillä jopa 100 % sairastuneista kaloista voi kuolla. Tauti esiintyy kesäaikaan yleensä viljellyillä lohikaloilla. Sen esiintyminen on lisääntynyt viime vuosien aikana, mutta syitä siihen ei tiedetä. The…

Characterization of the interaction of the antifungal and cytotoxic cyclic glycolipopeptide hassallidin with sterol-containing lipid membranes.

2019

Hassallidins are cyclic glycolipopeptides produced by cyanobacteria and other prokaryotes. The hassallidin structure consists of a peptide ring of eight amino acids where a fatty acid chain, additional amino acids, and sugar moieties are attached. Hassallidins show antifungal activity against several opportunistic human pathogenic fungi, but does not harbor antibacterial effects. However, they have not been studied on mammalian cells, and the mechanism of action is unknown. We purified hassallidin D from cultured cyanobacterium Anabaena sp. UHCC 0258 and characterized its effect on mammalian and fungal cells. Ultrastructural analysis showed that hassallidin D disrupts cell membranes, causin…