Assuntos
Oxirredutases do Álcool/genética , Proteínas de Bactérias/genética , DNA Bacteriano/análise , Poríferos/microbiologia , Pseudomonas fluorescens/genética , Oxirredutases do Álcool/isolamento & purificação , Animais , Proteínas de Bactérias/isolamento & purificação , Sequência de Bases , Água Doce , Genoma Bacteriano/genética , Lagos/microbiologia , Sondas Moleculares , Dados de Sequência Molecular , Filogenia , Pseudomonas fluorescens/enzimologia , Alinhamento de SequênciaRESUMO
The microbial community of Baikal sponges has been studied in five species belonging to the genera Swartschewskia, Baicalospongia, and Lubomirskia of the endemic family Lubomirskiidae. The results show that the total numbers of bacteria and bacterioplankton production have an effect on the growth of L. baicalensis body. Bacteria of the genera Pseudomonas, Bacillus, Micrococcus, Sarcina, Flavobacterium, Arthrobacter, and Acinetobacter living in the sponges are representatives of the Baikal bacterioplankton. Actinomycetes of the genera Streptomyces and Micromonospora are a permanent component of the cultivable sponge microbial community. The numbers and enzyme activities of heterotrophic, oligotrophic, and psychrophilic bacteria isolated from different sponge species and the surrounding water in autumn and in winter have been estimated.
Assuntos
Ecossistema , Água Doce/microbiologia , Plâncton/microbiologia , Poríferos/microbiologia , Simbiose/fisiologia , Animais , SibériaRESUMO
It was demonstrated that actinomycetes of Lake Baikal are strong antagonists of other microorganisms. Representatives of the genera Streptomyces and Micromonospora inhibit the growth of bacteria isolated from the lake, as well as of antibiotic-resistant microorganisms causing various human diseases. Baikal actinomycetes display a wide range of antagonistic activity and are potential producers of new biologically active substances.
Assuntos
Antibiose , Água Doce/microbiologia , Micromonospora/fisiologia , Streptomyces/fisiologia , Actinobacteria/isolamento & purificação , Actinobacteria/fisiologia , Antibacterianos/biossíntese , Antibacterianos/isolamento & purificação , Antifúngicos/isolamento & purificação , Antifúngicos/metabolismo , Micromonospora/isolamento & purificação , Streptomyces/isolamento & purificaçãoRESUMO
Degradation of bis-(2-ethylhexyl)phthalate (BEHP) by microbial associations of water and bottom sediments of the Selenga River and Lake Baikal and by pure cultures of microbial species belonging to various taxa isolated from the sediments under discussion has been studied. It has been shown that intense biological degradation occurs in both water and sediments. The degrees of conversion in experimental closed systems on minimal media are 46 and 24%, respectively. The most active of the organisms studied is a Micromironospora actinomycete. It degraded BEHP by 36% of its initial concentration. Spore-forming bacteria and microorganisms of the genus Pseudomonas were less active (17-23% and 7-11%).
Assuntos
Bactérias/metabolismo , Dietilexilftalato/metabolismo , Água Doce/microbiologia , Sedimentos Geológicos/microbiologia , Bacillus/metabolismo , Biodegradação Ambiental , Água Doce/análise , Sedimentos Geológicos/análise , Micromonosporaceae/metabolismo , Pseudomonas/metabolismo , Streptomyces/metabolismoRESUMO
The taxonomic analysis of 107 actinomycete strains isolated from the bottom sediments and water of Lake Baikal showed that most of the water isolates belong to the genus Streptomyces and most of the sediment isolates belong to the genus Micromonospora. In the sediments, the number of actinomycetes increased with depth (down to 200 m). Eight Streptomyces isolates were identified to a species level.
