Long‐term starvation survival of a thermophilic sulfidogen consortium

Bass, Catherine; Davey, Robert A.; Lappin‐Scott, Hilary M.

doi:10.1080/01490459809378060

Cited by 6 publications

(3 citation statements)

References 16 publications

(8 reference statements)

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“…These changes in size and shape undergone by prokaryotes after entrapment in fluid inclusions appear to be similar to the transformations observed in microorganisms when they are in a state of ''starvation-survival'' (Morita, 1982(Morita, , 1997. Starvation survival has been documented for microorganisms in many environments, including soils and marine surface waters, and has been verified by laboratory studies (Novitsky and Morita, 1976;Morita, 1982;Amy and Morita, 1983;Kjelleberg et al, 1983;Kjelleberg and Hermansson, 1984;Moyer and Morita, 1989;Amy et al, 1993;Bass et al, 1998). Laboratory experiments have shown that, in nutrient-poor environments, some microorganisms change shape (rod to coccus) and reduce in size, ''miniaturize,'' over periods of hours to months by fragmentation, that is, cell division without growth, and reduction in size of fragmented cells (Kjelleberg et al, 1983).…”

Section: Miniaturization Of Ancient Cellsmentioning

confidence: 90%

“…Laboratory experiments have shown that, in nutrient-poor environments, some microorganisms change shape (rod to coccus) and reduce in size, ''miniaturize,'' over periods of hours to months by fragmentation, that is, cell division without growth, and reduction in size of fragmented cells (Kjelleberg et al, 1983). Upon returning to nutrient-rich environments, miniaturized cells are viable but not always culturable (Amy and Morita, 1983;Amy et al, 1993;Kieft et al, 1997;Bass et al, 1998).…”

Section: Miniaturization Of Ancient Cellsmentioning

confidence: 99%

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Microscopic Identification of Prokaryotes in Modern and Ancient Halite, Saline Valley and Death Valley, California

2009

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Primary fluid inclusions in halite crystallized in Saline Valley, California, in 1980, 2004-2005, and 2007, contain rod- and coccoid-shaped microparticles the same size and morphology as archaea and bacteria living in modern brines. Primary fluid inclusions from a well-dated (0-100,000 years), 90 m long salt core from Badwater Basin, Death Valley, California, also contain microparticles, here interpreted as halophilic and halotolerant prokaryotes. Prokaryotes are distinguished from crystals on the basis of morphology, optical properties (birefringence), and uniformity of size. Electron micrographs of microparticles from filtered modern brine (Saline Valley), dissolved modern halite crystals (Saline Valley), and dissolved ancient halite crystals (Death Valley) support in situ microscopic observations that prokaryotes are present in fluid inclusions in ancient halite. In the Death Valley salt core, prokaryotes in fluid inclusions occur almost exclusively in halite precipitated in perennial saline lakes 10,000 to 35,000 years ago. This suggests that trapping and preservation of prokaryotes in fluid inclusions is influenced by the surface environment in which the halite originally precipitated. In all cases, prokaryotes in fluid inclusions in halite from the Death Valley salt core are miniaturized (<1 microm diameter cocci, <2.5 microm long, very rare rod shapes), which supports interpretations that the prokaryotes are indigenous to the halite and starvation survival may be the normal response of some prokaryotes to entrapment in fluid inclusions for millennia. These results reinforce the view that fluid inclusions in halite and possibly other evaporites are important repositories of microbial life and should be carefully examined in the search for ancient microorganisms on Earth, Mars, and elsewhere in the Solar System.

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Section: Miniaturization Of Ancient Cellsmentioning

confidence: 90%

Section: Miniaturization Of Ancient Cellsmentioning

confidence: 99%

Microscopic Identification of Prokaryotes in Modern and Ancient Halite, Saline Valley and Death Valley, California

2009

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“…No attempt was made to maintain the initial 4 ml h −1 throughput, which reduced to 2 ml h −1 over 24 h as the pore throats were constricted by accumulated and growing biofilm. A peristaltic pump (B) controlled the flow of media [anaerobic formation water medium (Bass et al ., 1998) with 0.07 g l −1 sodium acetate and 0.6 g l −1 sodium pyruvate] into the (prefilled) header reservoir (C) and the fluid passed due to gravity through a (presaturated) micromodel (F) to the lower effluent vessel (J). This porous glass micromodel was specially designed and manufactured (see ‘Micromodel design’) and mounted horizontally on a heated microscope stage with a hole cut to allow light to pass from condenser to lens allowing examination of biofilm accumulation and transport (E).…”

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confidence: 99%

A novel approach to investigate biofilm accumulation and bacterial transport in porous matrices

Dunsmore

Bass

Lappin‐Scott

2003

Environmental Microbiology

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Knowledge of bacterial transport through, and biofilm growth in, porous media is vitally important in numerous natural and engineered environments. Despite this, porous media systems are generally oversimplified and the local complexity of cell transport, biofilm formation and the effect of biofilm accumulation on flow patterns is lost. In this study, cells of the sulphate-reducing bacterium, Desulfovibrio sp. EX265, accumulated primarily on the leading faces of obstructions and developed into biofilm, which grew to narrow and block pore throats (at a rate of 12 micro m h(-1) in one instance). This pore blocking corresponded to a decrease in permeability from 9.9 to 4.9 Darcy. Biofilm processes were observed in detail and quantitative data were used to describe the rate of biofilm accumulation temporally and spatially. Accumulation in the inlet zone of the micromodel was 10% higher than in the outlet zone and a mean biofilm height of 28.4 micro m was measured in a micromodel with an average pore height of 34.9 microm. Backflow (flow reversal) of fluid was implemented on micromodels blocked with biofilm growth. Although biofilm surface area cover did immediately decrease (approximately 5%), the biofilm quickly re-established and permeability was not significantly affected (9.4 Darcy). These results demonstrate that the glass micromodel used here is an effective tool for in situ analysis and quantification of bacteria in porous media.

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Petroleum Reservoirs, Influence, Activity and Growth of Subsurface Microflora in

Bass

Lappin‐Scott

2003

Encyclopedia of Environmental Microbiology

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Origins of Hydrocarbon Reservoirs Oil‐Bearing Rock Formations as Microbial Habitats Microbiology of Oil‐Bearing Rocks Microbial Consequences of Oil Reservoir Exploitation Application of Microbial Technology for Exploitation of Petroleum Reservoirs

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Long‐term starvation survival of a thermophilic sulfidogen consortium

Cited by 6 publications

References 16 publications

Microscopic Identification of Prokaryotes in Modern and Ancient Halite, Saline Valley and Death Valley, California

Microscopic Identification of Prokaryotes in Modern and Ancient Halite, Saline Valley and Death Valley, California

A novel approach to investigate biofilm accumulation and bacterial transport in porous matrices

Petroleum Reservoirs, Influence, Activity and Growth of Subsurface Microflora in

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