Sunday, December 24, 2006
Earlier this fall, Nakabachi et al. described a 160-Kilobase genome from the bacterial endosymbiont Carsonella in Science (PubMed). Now, Baker et al. describe acidophilic Archaea that may be the smallest cells yet observed (Science, PubMed). The authors themselves express this claim cautiously ("It has not escaped our attention that if the average cell size estimated from TEM observations is accurate, the ARMAN cells have volumes of <0.006>3, making them smaller than any other known cellular life form."), but it seems to me that even if this is some sort of artifact (perhaps these cells are larger, but extremely reticulate) it still bears on the controversy regarding microfossils in the martial meteorite ALH84001, which have been thought too small to be life.