Clusterization of halophilic and halotolerant eubacteria using whole-cell protein electrophoresis data

Bykova, S. A.; Zvyagintseva, I. S.; Akhlynin, D. S.; Belyaev, S. S.; Гальченко, В. Ф.

doi:10.1007/bf02756812

Cited by 3 publications

(1 citation statement)

References 9 publications

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“…Dietzia maris appeared to be widely distributed in the marine environment (e.g. Colquhoun et al, 1998Colquhoun et al, , 2000Bykova et al, 2000;Inagaki et al, 2003;Stach et al, 2003;Gontang et al, 2007). The occurrence of bacteria able to degrade alkenones selectively in the marine environment is thus very likely.…”

Section: Biogeochemical Implicationsmentioning

confidence: 99%

Potential alteration of U 37K′ paleothermometer due to selective degradation of alkenones by marine bacteria isolated from the haptophyte Emiliania huxleyi

Zabeti¹,

Bonin²,

Volkman³

et al. 2010

FEMS Microbiology Ecology

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The unsaturation ratio of C(37) alkenones (U(37)(K')) produced by haptophyte microalgae such as Emiliania huxleyi is often used as proxy for past sea surface temperature. In this study, 29 bacterial strains were isolated from cultures of the strain E. huxleyi TWP1. Among alkenone-degrading isolates, the strain Dietzia maris sp. S1 appeared to be able to selectively degrade alkenones leading to increases in the palaeoenvironmental proxy U(37)(K') by +0.05 to +0.10 units, which is equivalent to the change seen when the growth temperature is increased by 1.5-3.0 degrees C. This degradation was shown to involve initial epoxidation of the alkenone double bonds presumably by a monooxygenase, which showed a preference for oxidation of the omega29 double bond. Inconsistencies observed in previous studies of the aerobic microbial degradation of alkenones may simply reflect which species of bacteria were present. Our results confirm that intense aerobic bacterial degradative processes can introduce a bias in palaeotemperature reconstructions especially when there is evidence of substantial aerobic bacterial degradation of the deposited organic matter. The widespread occurrence of epoxyalkenones in the marine environment strongly suggests that selective aerobic bacterial degradation could be major source of uncertainty for palaeotemperature estimation.

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Section: Biogeochemical Implicationsmentioning

confidence: 99%

Potential alteration of U 37K′ paleothermometer due to selective degradation of alkenones by marine bacteria isolated from the haptophyte Emiliania huxleyi

Zabeti¹,

Bonin²,

Volkman³

et al. 2010

FEMS Microbiology Ecology

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et al. 2001

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Sucrose enhances the chromogenic ability ofStaphylococcus xylosusby improving nitric oxide synthase activity

Zheng

Shang

et al. 2023

Food Quality and Safety

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In this paper, the effect of different concentrations of sucrose stress on color formation of the Staphylococcus xylosus (S. xylosus) was investigated. The results showed that the highest a* value and the best coloring effect similar to nitrite were observed after addition of 0.05 g/mL sucrose to stress the S. xylosus. UV-Vis and ESR spectra analysis showed that production of coloring product Mb-NO was significantly enhanced after 0.05 g/mL sucrose stress. The growth curve, reactive oxygen content, cell cycle, NOS activity, zeta potential, cell size and protein composition of S. xylosus were investigated to reveal the mechanism of sucrose stress to enhance the coloring effect of the strain. The result showed that sucrose inhibited the growth of the S. xylosus, which changed the physiological state by activating the oxidative stress response. The stress altered the rate of intracellular metabolism of S. xylosus by delaying the cell cycle, increasing cell surface zeta potential and cell particle size. These changes altered protein composition of the cells, and significantly enhanced activity of intracellular NOS, which could improve the chromogenic ability of S. xylosus. This study will provide theoretical support for sucrose stress on the S. xylosus to enhance its coloring effect, and sucrose stress for S. xylosus might be a promising biological alternative to nitrite in meat products.

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Clusterization of halophilic and halotolerant eubacteria using whole-cell protein electrophoresis data

Cited by 3 publications

References 9 publications

Potential alteration of U 37K′ paleothermometer due to selective degradation of alkenones by marine bacteria isolated from the haptophyte Emiliania huxleyi

Potential alteration of U 37K′ paleothermometer due to selective degradation of alkenones by marine bacteria isolated from the haptophyte Emiliania huxleyi

Untitled

Sucrose enhances the chromogenic ability ofStaphylococcus xylosusby improving nitric oxide synthase activity

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