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Full-Text Articles in Life Sciences
Peet: Lower Worms Of The Meiofauna - Models For Early Metazoan Evolution, Seth Tyler
Peet: Lower Worms Of The Meiofauna - Models For Early Metazoan Evolution, Seth Tyler
University of Maine Office of Research Administration: Grant Reports
Among the small invertebrates living between sand grains in the marine environment, are tiny, cryptic worms that many consider to be the most primitive of all bilaterally symmetrical animals (that is, all animals excluding the cnidarians and sponges). These worms include two small groups called acoel and catenulid turbellarians which are now classified in the phylum Platyhelminthes (flatworms) but that, according to some systematists, may not even be related to the more familiar flatworms such as planarians and polyclads. Another of these primitive worm groups is the Gnathostomulida, whose relationships to other phyla of invertebrates have been similarly controversial; by …
Collaborative Research: What Limits Denitrification And Bacterial Growth In Lake Bonney, Taylor Valley, Antarctica?, Mark L. Wells, Charles Trick
Collaborative Research: What Limits Denitrification And Bacterial Growth In Lake Bonney, Taylor Valley, Antarctica?, Mark L. Wells, Charles Trick
University of Maine Office of Research Administration: Grant Reports
Denitrification is the main process by which fixed nitrogen is lost from ecosystems and the regulation of this process may directly affect primary production and carbon cycling over short and long time scales. Previous investigations of the role of bioactive metals in regulating denitrification in bacteria from permanently ice-covered Lake Bonney in the Taylor Valley of East Antarctica indicated that denitrifying bacteria can be negatively affected by metals such as copper, iron, cadmium, lead, chromium, nickel, silver and zinc; and that there is a distinct difference in denitrifying activity between the east and west lobes of the lake. Low iron …