Dried leaves of Thalassia testudinum and Syringodiurn filiforrne released 12.6 % and 19.4 %, respectively, of their organic carbon as dissolved organic carbon (DOC) dunng 3 d of axenic leaching. When inoculated with microbes, the DOC was rapidly converted to bacterial aggregates of a size that could be ingested by macroconsumers. Large populations of ciliates and flagellates also developed, presumably feeding on the unaggregated bacteria. In treatments containing the residual macroparticulate organic carbon (MPOC), 75-95 % of the bacteria present were attached to the leaves, and suspended aggregates were not observed. The protozoan community was dominated by freeswimming flagellates that grazed on the suspended bacteria and were thus responsible for the absence of those forms. Total microbial populations in the DOC treatments were 10-12 times greater per unit of seagrass carbon originally added than in the MPOC containing flasks. These results show that seagrass DOC may rapidly be made available to higher consumers through processes that produce suitable sized food particles-viz., growth of protozoans on bacteria and formation of bacterial aggregates.
The synthesis of a mixture
of deuterated cyclopentadiene adducts (3) required for the pyrolytic
generation of CHD=C=C=O and CD2=C=C=O is described. Methyleneketene
is conveniently generated for microwave spectroscopy by flash vacuum pyrolysis
of acrylic anhydride at 510- 560°. Pyrolysis of diphenylmethyl
propiolate gives benzophenone and methyleneketene (or its decomposition
products)as the major process, but minor processes leading to diphenylmethane,
fluorene and 3-phenylphthalide also occur.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.