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Nitrite inhibition and intermediates effects on Anammox bacteria: a batch-scale experimental study.
Abstract A batch test procedure, based on manometric measurements, was used to study the Anammox process, in particular the inhibition due to nitrite and the effects of hydroxylamine and hydrazine,Expand
The Passive Yet Successful Way of Planktonic Life: Genomic and Experimental Analysis of the Ecology of a Free-Living Polynucleobacter Population
Experiments indicated that these bacteria live as chemoorganotrophs by mainly utilizing low-molecular-weight substrates derived from photooxidation of humic substances, which resulted in a highly passive lifestyle so far only known among free-living bacteria from pelagic marine taxa dwelling in environmentally stable nutrient-poor off-shore systems. Expand
“Candidatus Midichloriaceae” fam. nov. (Rickettsiales), an Ecologically Widespread Clade of Intracellular Alphaproteobacteria
It is suggested that aquatic/environmental protista have acted as evolutionary reservoirs for members of this novel family, from which one or more lineages with the capacity of infecting metazoa have evolved. Expand
Polynucleobacter necessarius, a model for genome reduction in both free-living and symbiotic bacteria
It is argued that this unusual system will provide an exceptionally useful model for investigations on symbiosis, because of its peculiarities and the commonness and ease of handling of the ciliate hosts, and compared with current hypotheses for genome erosion in symbionts and free-living bacteria. Expand
Polynucleobacter Bacteria in the Brackish‐Water Species Euplotes harpa (Ciliata Hypotrichia)
Antibiotic experiments showed that the elimination of the bacteria stops the reproductive cycle in E. harpa, as has been shown for the freshwater Euplotes species. Expand
Symbionts of the ciliate Euplotes: diversity, patterns and potential as models for bacteria–eukaryote endosymbioses
The first systematic survey of Euplotes endosymbionts is presented, adopting a classical as well as a metagenomic approach, and it provides insights into the distribution, evolution and diversity of these symbionts, and outline differences and similarities with the most well-understood group of eukaryotic hosts: insects. Expand
Identification of the bacterial endosymbionts of the marine ciliate Euplotes magnicirratus (Ciliophora, Hypotrichia) and proposal of 'Candidatus Devosia euplotis'.
Differences at the 16S rRNA gene level and the peculiar habitat indicate that the endosymbiont represents a novel species, and the provisional name 'Candidatus Devosia euplotis' is proposed. Expand
Endosymbiosis in statu nascendi: close phylogenetic relationship between obligately endosymbiotic and obligately free-living Polynucleobacter strains (Betaproteobacteria).
It is concluded that the two groups of PnecC bacteria represent obligately free-living and obligately endosymbiotic strains, respectively, and do not represent different stages of the same complex life cycle. Expand
‘Candidatus Megaira polyxenophila’ gen. nov., sp. nov.: Considerations on Evolutionary History, Host Range and Shift of Early Divergent Rickettsiae
The presence of the same bacterial species within different, evolutionary distant, hosts indicates that 'Candidatus Megaira polyxenophila' recently underwent several distinct host shifts, thus suggesting the existence of horizontal transmission pathways and a new interpretation of the origin and phylogenetic diversification of rickettsia. Expand
“Candidatus Anadelfobacter veles” and “Candidatus Cyrtobacter comes,” Two New Rickettsiales Species Hosted by the Protist Ciliate Euplotes harpa (Ciliophora, Spirotrichea)
Two new bacteria belonging to the “Candidatus Midichloria” clade, hosted by two different strains of the ciliate protist Euplotes harpa, are described on the basis of ultrastructural observations, comparative 16S rRNA gene sequence analysis, and an estimation of the percentage of infection. Expand