Stable-isotope probing of microorganisms thriving at thermodynamic limits: syntrophic propionate oxidation in flooded soil

Article Abstract:

The first identification of active anaerobic microorganisms by stable-isotope probing (SIP), which are involved in the thermodyanimically unfavorable syntrophic oxidation of propionate under methanogenic conditions is presented. Three distinct lineages of syntrophic propionate oxidizers (Syntrophobacter, Smithella, and Pelotomaculum spp.) were identified to operate simultaneously in anoxic rice field soil slurries and their hydrogenotrophic and acetotrophic methanogenic partner organisms were also detected by assimilation of labeled intermediates.

Anaerobiosis, Methanobacteriaceae, Methanogens, Thermodynamics

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"Candidatus hepatoplasma crinochetorum," a new, stalk-forming lineage of mollicutes colonizing the midgut glands of a terrestrial isopod

Article Abstract:

Study of the phylogenetic affiliation, diversity, and location of the spherical symbionts by cloning and sequencing 16S rRNA genes and performing denaturing gradient gel electrophoresis (DGGE) and hybridization with specific fluorescence-labeled oligonucleotide probes is discussed. The morphology and ultrastructure of these organisms were determined by using scanning and transmission electron microscopy. Results provide novel insights into the origin and diversity of the hepatopancreatic symbionts of isopods.

Nucleotide sequence, Base sequence, Gel electrophoresis, Phylogeny

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Structure and topology of microbial communities in the major gut compartments of Melolontha melolontha larvae (Coleoptera: Scarabaeidae)

Article Abstract:

A microsensor analysis of the physiochemical conditions in the intestinal tract of Melolontha melolontha larvae and of the structure and topological organization of the microbial community using a combination of several molecular techniques were studied. The microbial communities of each gut region differ considerably and the specificity of certain populations for different compartments suggests sulfate reducers colonize the hindgut wall.

Microbial populations, Larvae

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