Taking this into account, the un-hybridized C. velia in pure culture warrants further investigation. find more False-negative results arising from a failure to detect all C. velia cells in samples could have downstream effects, especially when quantifying environmental samples. FISH targeting rRNA is only successful on live cells and its efficiency decreases as cellular
activity diminishes (Gruden et al., 2003). In this study, we noted CV1 un-labelled C. velia cells in 2-weeks-old culture. In bacteria, weak FISH signals have been linked to lower ribosome content of slow-growing cultures owing to their lower cellular activity (DeLong et al., 1989). With only a hypothetical lifecycle for C. velia in place (Obornik et al., 2011), little is known about the physiological activity of this organism. Consequently, the un-labelled cells may represent a dormant cellular phase of the C. velia lifecycle which has not yet been elucidated. The recent isolation of the unicellular C. velia has been hailed a grand medical and veterinary discovery by protozoologists (Okamoto & McFadden, 2008). The novel
FISH detection protocol developed in this study has potential to enable specific detection of C. velia within its natural coral habitat. We thank Dr Mathieu Pernice (University of Queensland) Smad inhibitor for discussions and Dr Min Chen (University of Sydney) for the access to the miniature spectrometer. This study was supported by the Australian Research Council, Discovery Project DP0986372 and in part by the Faculty of Veterinary
Science, University of Sydney. The funders had no role in study design, data collection and analysis, decision to publish or preparation of the manuscript. “
“A newly described bacterial isolate, Acinetobacter sp. HM746599, has been obtained from leatherback sea turtle hatchling blood. The implication is that the hatchling was infected during development in the egg, which is substantiated by other studies to be reported by us in Teicoplanin the future. The 16S rRNA gene sequence of the bacterium (GenBank accession number: HM746599) showed the greatest similarity to the identified species, Acinetobacter beijerinckii (97.6–99.78%) and Acinetobacter venetianus (99.78%). Acinetobacter sp. HM746599 are gram-negative, rod-shaped coccobacilli and are hemolytic/cytotoxic to human and sea turtle red blood cells (RBCs). Hemolysis is not the result of any detectable soluble toxin. Acinetobacter beijerinckii and A. venetianus hemolyze sheep RBCs while Acinetobacter sp. HM746599 does not, and unlike A. venetianus, the growth of Acinetobacter sp. HM746599 and A. beijerinckii is not supported by l-arginine. Many Acinetobacter species, especially hemolytic ones, are pathogenic to immunologically compromised humans and it is possible that, in addition to sea turtles, this bacterium might also be a danger to susceptible humans who handle infected hatchlings.