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Chitin dynamics in the freshwater environment
Biochemical Systematics and Ecology, 1991The seasonal fluctuation of chitin dynamics in fresh water was studied in a mesotrophic bog and a hypereutrophic lake in Japan. The metabolic rates of chitin were higher in more eutrophic water. Thus, the chitin turnover rate during summer was one order of magnitude greater in the hypereutrophic lake than in the mesotrophic bog.
Shingo Miyamoto +2 more
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Speciation and Bioavailability of Trace Metals in Freshwater Environments
2005A number of trace elements, both essential and non-essential, are present at elevated concentrations over the background levels in numerous freshwaters. Elements with important anthropogenic inputs into freshwaters comprise in particular copper, zinc, nickel, chromium, lead, cadmium, mercury, and silver.
Sigg, Laura, Behra, Renata
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Cyanobacteria in Freshwater Benthic Environments
2012Cyanobacteria are widespread in freshwater benthic environments, which include wetlands, lake littoral zones, streams and rivers. This chapter outlines the major constraints on cyanobacteria in these environments. Environmental and ecological factors that determine the diversity and biomass of cyanobacteria in the freshwater benthos include physical ...
J. Thad Scott, Amy M. Marcarelli
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Fungal Decomposers in Freshwater Environments
2019Streams, rivers, and freshwater marshes often depend on plant litter as a source of carbon, nutrients, and energy that drive ecosystem processes. Decomposition of this organic matter, such as leaves, wood, or emergent macrophytes, is mediated mostly by fungi, whereas the role of bacteria is minor.
Gulis, Vladislav +2 more
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Bacteriology of the freshwater environment: Implications for clinical therapy
Annals of Emergency Medicine, 1987Water and animal tissue samples were obtained from sources in Tennessee, California, and Florida. Purified bacterial colonies were isolated and organisms identified. Fifty-eight isolates were recovered. Twenty-seven Gram-negative isolates were identified. Gram-positive organisms were of the coryneform group or Bacillus species.
P S, Auerbach +5 more
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Environment and Reproduction in Freshwater Triclads
Nature, 1961REPRODUCTION in triclads varies from asexual to complicated sexual methods1,2 both within and between species. Attempts to determine the causes of such differences resulted in controversy between students favouring the external environment3 and those favouring an internal physiological process4,5 as the determinant.
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Plasmid Transfer in a Freshwater Environment
1988As the potential uses for genetically manipulated micro-organisms widen the demand for their exploitation will increase. This will inevitably result in their deliberate or accidental release, an occurrance which has led ecologists to predict environmental disaster [13]. Others believe that the chance of disaster is remote because of experience with non-
M. J. Day, M. J. Bale, J. C. Fry
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Freshwater Microcosms in Fluctuating Environments
Oikos, 1977mical nutrients were added to the microcosms at a constant rate while the energy for photosynthesis was supplied at three different intensities and was modulated sinusoidally providing a component of the environment which fluctuated in a deterministic fashion.
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Behaviour of Technetium in Freshwater Environments
1986Currently the major sources of 99Tc released to the environment in the United States are gaseous diffusion plants that enrich reprocessed nuclear fuel. At present these facilities are located on freshwater streams into which liquid effluents are released.
Blaylock, B. G. +3 more
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