Download Dormancy and Resistance in Harsh Environments by Esther Lubzens, Joan Cerda, Melody Clark PDF

By Esther Lubzens, Joan Cerda, Melody Clark

Many organisms have developed the power to go into into and revive from a dormant nation. they could continue to exist for lengthy classes during this kingdom (often even months to years), but can develop into responsive back inside mins or hours. this can be, yet now not inevitably, linked to desiccation. retaining one’s physique and reviving it in destiny generations is a dream of mankind. thus far, besides the fact that, we have now didn't learn the way cells, tissues or complete organisms may be made dormant or be successfully revived at ambient temperatures. during this ebook reviews on organisms, starting from aquatic cyanobacteria that produce akinetes to hibernating mammals, are awarded, and show universal but additionally divergent physiological and molecular pathways for surviving in a dormant shape or for tolerating harsh environments. trying to examine the capabilities linked to dormancy and the way they're regulated is without doubt one of the nice destiny demanding situations. Its relevance to the maintenance of cells and tissues is among the key issues of this book.

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By Esther Lubzens, Joan Cerda, Melody Clark

Many organisms have developed the power to go into into and revive from a dormant nation. they could continue to exist for lengthy classes during this kingdom (often even months to years), but can develop into responsive back inside mins or hours. this can be, yet now not inevitably, linked to desiccation. retaining one’s physique and reviving it in destiny generations is a dream of mankind. thus far, besides the fact that, we have now didn't learn the way cells, tissues or complete organisms may be made dormant or be successfully revived at ambient temperatures. during this ebook reviews on organisms, starting from aquatic cyanobacteria that produce akinetes to hibernating mammals, are awarded, and show universal but additionally divergent physiological and molecular pathways for surviving in a dormant shape or for tolerating harsh environments. trying to examine the capabilities linked to dormancy and the way they're regulated is without doubt one of the nice destiny demanding situations. Its relevance to the maintenance of cells and tissues is among the key issues of this book.

Show description

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Extra resources for Dormancy and Resistance in Harsh Environments

Example text

The involvement of regulatory cascade and transcription factors, primarily associated with the formation of heterocysts, were also identified in the akinete induction process. These findings clearly support an early notion (Wolk et al. 1994) that heterocysts may have evolved from akinetes. Implementation of various molecular techniques and data from fully sequenced genomes of several Nostocales species ensure a rapid advancement toward a better understanding of the dormancy phenomenon in cyanobacteria.

It is not known exactly how the dormant spores sense the presence of nutrients. Whether the spore detects the essential nutrients simultaneously or if glucose is sensed first and this initial signal then enables the cell to recognise other nutrients still needs to be determined. 3 Saccharomyces cerevisiae Spore Germination 33 The glucose needs to be taken up and metabolised; its mere presence is not enough for germination to take place. Addition to the medium of the non-metabolisable glucose analog 2-deoxyglucose is not enough to initiate germination (Herman and Rine 1997).

Throughout germination, the spore wall surface becomes more and more uneven with continuous ridges over the entire surface (Rousseau et al. 1972). The outer two spore layers are locally degraded to allow swelling, whereas the inner two layers stay intact. These inner layers will serve as the cell wall of the outgrowing vegetative cell (Hashimoto et al. 1958). Next, the germinating spore becomes pear-shaped, and further out-growth is seen as an elongation at one end of the cell. The outgrowth part of the cell has a smoother surface than the older part.

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