Journal ArticleDOI
Characteristics and role of the exocellular polysaccharides produced by five cyanobacteria isolated from phototrophic biofilms growing on stone monuments.
Federico Rossi,Ernesto Micheletti,Laura Bruno,Siba Prasad Adhikary,Patrizia Albertano,Roberto De Philippis +5 more
Reads0
Chats0
TLDR
The secretion of protective pigments in the polysaccharide layers, namely mycosporine amino acid-like substances (MAAs) and scytonemins, under exposure to UV radiation showed how the acclimation response contributes to the persistence of cyanobacteria on exposed lithoid surfaces in tropical areas.Abstract:
Three coccoid and two filamentous cyanobacterial strains were isolated from phototrophic biofilms exposed to intense solar radiation on lithic surfaces of the Parasurameswar Temple and Khandagiri caves, located in Orissa State, India. Based on to their morphological features, the three coccoid strains were assigned to the genera Gloeocapsosis and Gloeocapsa, while the two filamentous strains were assigned to the genera Leptolyngbya and Plectonema. Eleven to 12 neutral and acidic sugars were detected in the slime secreted by the five strains. The secretions showed a high affinity for bivalent metal cations, suggesting their ability to actively contribute to weakening the mineral substrata. The secretion of protective pigments in the polysaccharide layers, namely mycosporine amino acid-like substances (MAAs) and scytonemins, under exposure to UV radiation showed how the acclimation response contributes to the persistence of cyanobacteria on exposed lithoid surfaces in tropical areas.read more
Citations
More filters
Journal ArticleDOI
Role of cyanobacterial exopolysaccharides in phototrophic biofilms and in complex microbial mats
TL;DR: The aim of this survey is to outline the state-of-the-art of the importance of the cyanobacterial EPS excretion, both for the producing cells and for the microbial associations in which cyanobacteria are a key component.
Journal ArticleDOI
Cyanobacterial inoculation (cyanobacterisation): Perspectives for the development of a standardized multifunctional technology for soil fertilization and desertification reversal
TL;DR: The use of cyanobacteria as soil conditioners has been studied intermittently for many decades Some of the documented direct effects of the cyanobacterial inoculation are related to soil stabilization and improvement, enrichment in nutrients and increase in moisture content.
Journal ArticleDOI
Microbial deterioration and sustainable conservation of stone monuments and buildings
TL;DR: In this article, the role of microbes in the deterioration processes, the biochemical mechanisms involved and possible strategies for sustainable conservation of stone monuments and buildings are discussed, as well as how microbes contribute to the biodeterioration processes through their activities and biogeochemical cycles of elements.
Book ChapterDOI
Exocellular Polysaccharides in Microalgae and Cyanobacteria: Chemical Features, Role and Enzymes and Genes Involved in Their Biosynthesis
TL;DR: In this chapter, the current knowledge regarding the structure and composition of EPSs, the factors eliciting their synthesis, and the related codifying genes involved is reviewed and it is underlined and discussed how, notwithstanding the huge number of studies available, different aspects still need to be clarified.
References
More filters
Journal ArticleDOI
Conceptual Model for Production and Composition of Exopolymers in Biofilms
TL;DR: A conceptual biofilm model taking into account microbial physiology with regard to production of extracellular polymers and their transformation within the biofilm is suggested and can be helpful in structuring the design and evaluation of biofilm experiments focusing on biofilm structure and properties.
Book
Ecology of cyanobacteria II : their diversity in space and time
TL;DR: Cyanobacteria in the Cryosphere: Snow, Ice and Extreme Cold, Oil Pollution - and Cyanofuel?
Journal Article
Modern approach to the classification system of cyanophytes 1-Introduction.
Journal ArticleDOI
Production and cycling of natural microbial exopolymers (EPS) within a marine stromatolite
TL;DR: In this paper, the abundance, production, and degradation of extracellular polymeric secretions (EPS) in the upper layers of a microbial mat forming shallow subtidal stromatolites at Highborne Cay, Bahamas, were determined using 14 C tracer experiments and were integrated with measurements of other microbial community parameters.
Journal ArticleDOI
Cyanobacteria and Biodeterioration of Cultural Heritage: A Review
C.A. Crispim,C.C. Gaylarde +1 more
TL;DR: The development of molecular techniques for the rapid identification of cyanobacteria without need for culture and isolation is fundamental if knowledge of these communities in biofilms on the surfaces of historic buildings is to be extended.