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Gerald L. McLaughlin, Ph.D gmclaugh at INDYVAX.IUPUI.EDU
Thu Dec 11 20:58:35 EST 1997


Try a Medline with GC Clark, AJ Roger, WF Doolittle, and perhaps M Sogin as
authors; thumb through some of the recent issues of PNAS; and use chaperonin
as a search term.  Although a few experts disagree, the analyzed groups
without mitochondria appear to have nuclear genes derived from mitochondria,
so one wonders whether the postulated amitochondriate eukaryote line still
exists; one problem is that most searches have been among parasites, not
among free-living protists.  The "look at a ml of water" talk in Sydney that
emphasized a relatively small subset of similar ciliates as the dominant
large protozoan flora worldwide, made me wonder whether competition quickly
eliminates less successful microbes on a global scale.  Extinction of
species if not phyla is the most common event by far for taxa that can be
followed in the fossil record like vertebrates, shellfish and plants.  Some
odd groups are being defined by direct sequencing of non-culturable
microbes, and the postulated amitochondriate fossil relic may still be
found, or it seems a worthwhile search, anyway; perhaps something between
the archae and protists will start to look plausible.


Gerald McLaughlin, Ph.D.
Associate Professor
Department of Pathology and Laboratory Medicine
635 Barnhill Dr., MS A128
Indianapolis, IN  46202-5113
Ph 317-274-2651; FAX 317-278-0643
e-mail:  gmclaugh at iupui.edu

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