Structural modifications in the extracellular investment ofNostoc commune Vauch. during the life cycle I. Motile and nonmotile normogonium, biseriate stage

Bazzichelli, G.; Abdelahad, Nadia; Ventola, F.

doi:10.1016/0889-1605(85)90068-0

Cited by 10 publications

(5 citation statements)

References 13 publications

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“…Furthermore, colonial morphology varied according to the tip speeds of the impeller and filaments without investment appeared when the tip speed reached or exceeded 0.8 m·s −1 . It has been reported that polysaccharides in N. commune are composed of fluid and fibrillar components and that the variation in the ratio of these components transforms the investment into either gel or sol states (Bazzichelli et al 1985). Rehydration of dry N. commune leads to the transition from gel to sol (Hill et al 1997).…”

Section: Discussionmentioning

confidence: 98%

Morphology, cell growth, and polysaccharide production of Nostoc flagelliforme in liquid suspension culture at different agitation rates

Jia

Chen

et al. 2007

J Appl Phycol

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Noscoc flagelliforme is a terrestrial macroscopic cyanobacterium with high economic value. Free-living cells that were separated from a natural colony of N. flagelliforme were cultivated in a 20-L photobioreactor for 16 days at five agitation rates with impeller tip speeds at 0.3, 0., 0.8, 1.0, and 1.5 m·s −1 . With different impeller tip speeds there were significant differences in the cell growth and polysaccharide production, and different types of cell colonies appeared because of different shear forces caused by agitation. At harvest time, cell concentrations with tip speeds of 0.8 and 1.0 m·s −1 were clearly higher than those with the other three tip speeds, but dry cell weights with the tip speeds of 0.3, 0.5, 0.8, and 1.0 m·s −1 were almost the same. The highest RPS (polysaccharide that released into liquid medium) production was obtained with the tip speeds of 0.8 and 1.0 m·s −1 , while the highest EPS (polysaccharide that formed capsule or slime layer) production was obtained with the tip speed of 0.5 m·s −1 . The tip speed of 1.5 m·s −1 was harmful for both cell growth and polysaccharide production, indicating that an appropriate shear force was needed in the liquid suspension culture of N. flagelliforme.

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Section: Discussionmentioning

confidence: 98%

Morphology, cell growth, and polysaccharide production of Nostoc flagelliforme in liquid suspension culture at different agitation rates

Jia

Chen

et al. 2007

J Appl Phycol

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“…Bazazichelli et al (1985, 1986) reported that additional polysaccharides in N. commune were composed of fluid and fibrillar components. Variation in the ratio of the components displaces the sheath toward the gel or sol states (Bazzichelli et al 1985). Rehydration of N. commune led to marked changes in the rheological properties of the extracellular polysaccharides close to the cell surface, and these were presumably associated with gel to sol transition (Hill et al 1997).…”

Section: Discussionmentioning

confidence: 99%

CULTURE OF THE TERRESTRIAL CYANOBACTERIUM, NOSTOC FLAGELLIFORME (CYANOPHYCEAE), UNDER AQUATIC CONDITIONS¹

Gao

2003

Journal of Phycology

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“…Differentiation of such regions is best explained by the presence of physical boundaries (sheaths) originally separating two types of domains with dissimilar chemistries, one inside the sheath more favorable to mineral precipitation (in and around the cells) than the other (outside the sheath). Diagenetic homogenisation of the filament sheaths with the common amorphous slime matrix that incorporates the filaments is all the more plausible in view of the results of ultrastructural work by Bazzichelli et al . (1985).…”

Section: Systematic Affinities Of the Filamentous Fossilsmentioning

confidence: 98%

Cyanobacterial macrophytes in an Early Silurian (Llandovery) continental biota: Passage Creek, lower Massanutten Sandstone, Virginia, USA

Tomescu

Rothwell

Honegger

2006

LET

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A compression macrofossil with structure consisting of mineral‐replaced filaments embedded in an amorphous carbonaceous matrix is described as a macrophytic cyanobacterial colony from continental assemblages of the Early Silurian (Llandovery) Passage Creek biota, in the lower Massanutten Sandstone (Virginia, USA). Filaments are predominantly multiseriate and consist of spheroidal crystalline aggregates representing early pyrite (subsequently replaced by iron hydroxides) precipitated preferentially inside cells. Interpretation of the fossils as cyanobacteria is based on close similarities to modern organisms in terms of overall morphology and production of copious extracellular investments, filament and cell sizes, and continental epigeal (freshwater or terrestrial) habitat. This interpretation incorporates data on cyanobacterial taphonomy and mechanisms of diagenetic mineral precipitation. These fossils are part of the oldest macrofossil assemblages documenting well‐developed and diverse communities on continents. They provide the earliest direct evidence for cyanobacteria in strictly continental habitats, corroborating the commonly held but poorly documented view that cyanobacteria were among the initial colonizers of continents.

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Structural modifications in the extracellular investment ofNostoc commune Vauch. during the life cycle I. Motile and nonmotile normogonium, biseriate stage

Cited by 10 publications

References 13 publications

Morphology, cell growth, and polysaccharide production of Nostoc flagelliforme in liquid suspension culture at different agitation rates

Morphology, cell growth, and polysaccharide production of Nostoc flagelliforme in liquid suspension culture at different agitation rates

CULTURE OF THE TERRESTRIAL CYANOBACTERIUM, NOSTOC FLAGELLIFORME (CYANOPHYCEAE), UNDER AQUATIC CONDITIONS¹

Cyanobacterial macrophytes in an Early Silurian (Llandovery) continental biota: Passage Creek, lower Massanutten Sandstone, Virginia, USA

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Structural modifications in the extracellular investment ofNostoc commune Vauch. during the life cycle I. Motile and nonmotile normogonium, biseriate stage

Cited by 10 publications

References 13 publications

Morphology, cell growth, and polysaccharide production of Nostoc flagelliforme in liquid suspension culture at different agitation rates

Morphology, cell growth, and polysaccharide production of Nostoc flagelliforme in liquid suspension culture at different agitation rates

CULTURE OF THE TERRESTRIAL CYANOBACTERIUM, NOSTOC FLAGELLIFORME (CYANOPHYCEAE), UNDER AQUATIC CONDITIONS1

Cyanobacterial macrophytes in an Early Silurian (Llandovery) continental biota: Passage Creek, lower Massanutten Sandstone, Virginia, USA

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CULTURE OF THE TERRESTRIAL CYANOBACTERIUM, NOSTOC FLAGELLIFORME (CYANOPHYCEAE), UNDER AQUATIC CONDITIONS¹