A comparison of thermal loading effects on bacterial populations in polluted and non-polluted aquatic systems☆

Guthrie, Rufus K.; Cherry, Donald S.; Ferebee, Robert N.

doi:10.1016/0043-1354(74)90036-0

Cited by 19 publications

(8 citation statements)

References 4 publications

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“…Although most of the bacteria present in oligotrophic aquatic systems are metabolically active (KUZNETSOV et al 1997), only less than 1% can be cultured (STALEY and KONOPKA 1985). Therefore, plate counts of biofilm bacteria on R2A agar has been estimated as 0.1% or less of total cell counts (GUTHRIE et al 1974). However, bacteria attached to surfaces are more active than planktonic bacteria (MANZ et al 1993) and in this case it has been postulated that dominating bacteria were culturable on R2A medium .…”

Section: Discussionmentioning

confidence: 99%

“…The average heterotrophic plate count was 59 cfu/100 ml (n = 37, SD = 40) with a proportion of pigmented colonies which ranging from 24 to 90% of the viable count. It has been proposed that percentages of chromogenic bacteria higher than 25% of the heterotrophic plate count are indicative of nonpolluted water samples (GUTHRIE et al 1974). In the case of drinking waters, except for anomalous cases, all samples should be considered unpolluted.…”

Section: Tap Water Characteristicsmentioning

confidence: 99%

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Effect of chlorine, biodegradable dissolved organic carbon and suspended bacteria on biofilm development in drinking water systems

Codony

Morató

Ribas

et al. 2002

J. Basic Microbiol.

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The influence of chlorine levels, the concentration of dissolved organic carbon and the abundance of bacteria in suspension, on the formation of biofilms on experimental glass surfaces were evaluated. Twelve reactors, packed with glass spheres, were continuously perfused with tap water. The properties of water were altered in different ways: chlorine was neutralized by the addition of thiosulfate, the levels of assimilable organic carbon were increased through the addition of acetate, and the bacterial load was modified by means of the continuous inoculation of a growing active culture of Pseudomonas aeruginosa. Continuous addition of bacteria to water containing 0.5 mg/l of free chlorine, did not result in the formation of detectable biofilms even after one month. When bacteria were added simultaneously with thiosulfate as a chlorine neutralizer, a community of attached bacteria appeared in less than 24 hours. Addition of acetate with the presence of 0.5 mg/l of chlorine did not stimulate the formation of biofilms. On the contrary, neutralization of chlorine with thiosulfate allowed the formation of biofilms with 106 cfu/cm2 in about two weeks.

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Section: Discussionmentioning

confidence: 99%

Section: Tap Water Characteristicsmentioning

confidence: 99%

Effect of chlorine, biodegradable dissolved organic carbon and suspended bacteria on biofilm development in drinking water systems

Codony

Morató

Ribas

et al. 2002

J. Basic Microbiol.

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“…Taylor (1942) compared the bacteria in lake water with those isolated from soil, arid Collins (1970) listed the genera of bacteria commonly occurring in oligotrophic and eutrophic lakes. More recently Guthrie et al (1974) compared the bacterial populations of two reservoirs. The seasonal diversity in bacterial populations of some small ponds and streams (Cherry et al 1974) and eutrophic lakes (Niewolak 1972) have also been reported.…”

Section: Introductionmentioning

confidence: 99%

Aerobic heterotrqphic bacteria isolated from water, mud, and macrophytes of Lake Grasmere, New Zealand

Ramsay

1977

New Zealand Journal of Marine and Freshwater Research

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Aerobic heterotrophic bacteria were isolated from the water, mud, Elodea canadensis, and concentrated plankton of Lake Grasmere in inland Canterbury (43° 05' S, 171° 45'E) at intervals between April 1969 and July 1971. The characteristics of 1567 isolates are described. The bacteria were assigned to the following groups: pseudomonads, pink-pigmented pseudomonads, Alcaligenes/ Achromobacter, flavobacteria, Cytophaga, Enterobacteriaceae, Aeromonas/Vibrio, Acinetobacter, Chromobacterium, coryneforms, Micrococcaceae, and Bacillus. In the water the predominant bacteria in most of the samples were pseudomonads, Alcaligenes/Achromobacter, flavobacteria, and coryneforms. The bacterial population varied from year to year but at any one time the bacteria isolated from different areas of the lake were similar. Three mud samples were examined: only 20% of the bacteria isolated from a sample from the surface of the mud were Gram-positive, but the other two samples from up to 5 cm deep in the mud included 49% and 74% Gram-positive bacteria. Elodea canadensis supported an epiphytic population, predominantly of pseudomonads and flavobacteria, which was more stable than the population in the water. Enterobacteriaceae and Aeromonas/Vibrio, although common at times in the water, were rarely isolated from E. canadensis. Bacteria were enumerated from samples of concentrated plankton as the numbers of algae and zooplankton fluctuated. Less than 17% of the colony-forming heterotrophic bacteria were in close association with the plankton. No particular group of bacteria became more common as the plankton populations died back.

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“…This pigm ented bacterial flora can be detected by using plate-count media, such as those developed for HPC count, under appropriate incubation conditions. In fact, all three media were able to recover pigm ented bacteria, although not equally well, when an extended incubation period was provide d. It has generally been acknowledged that this bacterial flora is a naturally occurring popula tion in water (Guthrie et al 1974). How ever, the role of pigm ent-producing bacteria in the water ecology is unknow n. The range of the percentage of their occurrence is broad and, depending on the water source, is highly variable (Potter andBaker 1961, Reasoner andGeldreich 1979).…”

Section: Discussionmentioning

confidence: 93%

Detection of heterotrophic and pigmented bacteria in well water

Bonadonna¹,

Briancesco²,

Libera³

et al. 1999

International Journal of Environmental Health Research

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The heterotrophic plate count (HPC), at different temperatures, allows to recover mesophilic and psychrophilic bacteria, including some pigmented forms. Their densities were verified in well water used as a drinking water source and quali-quantitative differences of the colonies grown on different plate count media were evaluated. Most of the samples analysed had a good hygienic quality if the common indicators of faecal pollution were considered. Nevertheless high counts for the HPC bacteria and pigmented flora were recovered and among them some potential pathogens were identified. Therefore, even for the potential role of human pathogens posed by HPC bacteria naturally occurring in potable water, the European Member States should evaluate with particular attention the possibility of maintaining the HPC parameter when the new Directive on drinking water quality would have to be adopted.

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A comparison of thermal loading effects on bacterial populations in polluted and non-polluted aquatic systems☆

Cited by 19 publications

References 4 publications

Effect of chlorine, biodegradable dissolved organic carbon and suspended bacteria on biofilm development in drinking water systems

Effect of chlorine, biodegradable dissolved organic carbon and suspended bacteria on biofilm development in drinking water systems

Aerobic heterotrqphic bacteria isolated from water, mud, and macrophytes of Lake Grasmere, New Zealand

Detection of heterotrophic and pigmented bacteria in well water

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