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  • 1
    Online Resource
    Online Resource
    Cyanobacterial Biotechnology in the 21st Century (2023)
    Singapore :Springer Nature Singapore :
    Details
    Keywords: Bacteria. ; Microbial ecology. ; Microbiology. ; Bacteria. ; Environmental Microbiology. ; Microbiology.
    Description / Table of Contents: 1 Cyanobacteria and Cyanotoxins in Underground Water and the New Perspectives in a Climate Breakdown Scenario -- 2 On the pigment profile of 12 cyanobacteria isolated from unpolluted and polluted habitats of Southwest India -- 3 Cyanobacterial Stress and its OMICS Perspective -- 4 Spirulina: From ancient food to innovative super nutrition of the future and its market scenario as a source of neutraceutical -- 5 Response of cyanobacteria during abiotic stress with special reference to membrane biology: an overview -- 6 Microalgal Biopigments: Production and enhancement strategies to enrich microalgae-derived pigments -- 7 Bioprospecting and mechanisms of cyanobacterial hydrogen production and recent development for its enhancement as a clean energy -- 8 Molecular Biology of non-ribosomal peptides (NRPS) and Polyketide (PKs) biosynthesis in Cyanobacteria -- 9 Cyanobacteria as bioindicator of water pollution -- 10 Degradation of xenobiotics by cyanobacteria -- 11 Impact of pesticides on cyanobacteria in aquatic ecosystems -- 12 International environmental standards for the regulation of freshwater cyanobacterial blooms and their biotoxins -- 13 Therapeutic potential of cyanobacteria as a producer of novel bioactive compounds -- 14 Bioactivity potential of cyanobacterial species inhabitant of southwestern India -- 15 Cyanobacteria Mediated Heavy Metal and Xenobiotics Bioremediation.
    Abstract: This book covers recent advances in cyanobacterial research. It deals with diversity, evolutionary biology, stress physiology, molecular biology of stress responses, and biotechnology of this group of prokaryotes. Cyanobacteria are ubiquitous and, undoubtedly, agriculturally microorganisms in terms of carbon and nitrogen fixation. In addition, cyanobacteria have long been used to fertilize crops and are a source of protein for humans. In parallel with the advances in cyanobacterial research in the 21st century, the development and application of innovative techniques in molecular biotechnology has widened the spectrum of commercial applications and potential exploitation of cyanobacteria. This book will be of interest to both new and experienced researchers involved in cyanobacterial molecular biology, ecology, and industrial biotechnology. This collection of chapters from experts also serves as essential reading for undergraduate and graduate students of to understand the importance of cyanobacteria in agriculture, ecology, microbial physiology, and environmental sciences.
    Type of Medium: Online Resource
    Pages: XIII, 283 p. 1 illus. , online resource.
    Edition: 1st ed. 2023.
    ISBN: 9789819901814
    URL: https://doi.org/10.1007/978-981-99-0181-4
    DOI: 10.1007/978-981-99-0181-4
    DDC: 579.3
    Language: English
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    E-BOOKS (AWI ONLY)
  • 2
    Electronic Resource
    Electronic Resource
    Detection and sequencing of the microcystin LR-degrading gene, mlrA, from new bacteria isolated from Japanese lakes (2003)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 229 (2003), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: mlrA is the only microcystin-degrading gene detected in Sphingomonas sp. MJ-PV. The gene has an extremely rare nucleotide sequence and homologous genes have not yet been discovered in the DNA database. We discovered the existence of a gene homologous to mlrA in new microcystin-degrading bacteria, MD-1 and Y2. These strains possessed mlrA homologues, and the identities of the genes of MD-1 and Y2 with the corresponding MJ-PV exceeded 98% and 84%, respectively. On the other hand, the mlrA gene was not detected in laboratory strains of the closely related Sphingomonas spp. strains employing hemi-nested polymerase chain reaction detection using two primer sets. Although the microcystin-degrading bacteria were closely related strains, they did not cluster together as the same species. We can conclude that the mlrA gene is conserved in three different bacterial species, and it is unique to microcystin degraders but not to the genus Sphingomonas.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/S0378-1097(03)00847-4
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  • 3
    Electronic Resource
    Electronic Resource
    Insertion of an E. coli lacZ gene in Acetobacter xylinus for the production of cellulose in whey (2004)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 231 (2004), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: A mini-Tn10:lacZ:kan was inserted into a wild-type strain of Acetobacter xylinus by random transposon mutagenesis, generating a lactose-utilising and cellulose-producing mutant strain designated ITz3. Antibiotic selection plate assays and Southern hybridisation revealed that the lacZ gene was inserted once into the chromosome of strain ITz3 and was stably maintained in non-selective medium after more than 60 generations. The modified strain had, on the average, a 28-fold increase in cellulose production and a 160-fold increase in β-galactosidase activity when grown in lactose medium. β-Galactosidase activity is present in either lactose or sucrose medium indicating that the gene is constitutively expressed. Cellulose and β-galactosidase production by the modified strain was also evaluated in pure and enriched whey substrates. Utilisation of lactose in whey substrate by ITz3 reached 17 g l−1 after 4 days incubation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/S0378-1097(04)00007-2
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  • 4
    Electronic Resource
    Electronic Resource
    Insertional mutagenesis of a peptide synthetase gene that is responsible for hepatotoxin production in the cyanobacterium Microcystis aeruginosa PCC 7806[Data depos] (1997)
    Oxford, UK : Blackwell Science Ltd
    Molecular microbiology 26 (1997), S. 0 
    Details
    ISSN: 1365-2958
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: Several bloom-forming cyanobacterial genera produce potent inhibitors of eukaryotic protein phosphatases called microcystins. Microcystins are hepatotoxic cyclic heptapeptides and are presumed to be synthesized non-ribosomally by peptide synthetases. We identified putative peptide synthetase genes in the microcystin-producing strain Microcystis aeruginosa PCC 7806. Non-hepatotoxic strains of M. aeruginosa lack these genes. Strain PCC 7806 was transformed to chloramphenicol resistance. The antibiotic resistance cassette insertionally inactivated a peptide synthetase gene of strain PCC 7806 as revealed by Southern hybridization and DNA amplification. This is the first report of genetic transformation and mutation, by homologous recombination, of a bloom-forming cyanobacterium. Chemical and enzymatic analyses, including high-performance liquid chromatography (HPLC), mass spectrometry, amino acid activation, and protein phosphatase inhibition, revealed the inability of derived mutant cells to produce any variant of microcystin while maintaining their ability to synthesize other small peptides. The disrupted gene therefore encodes a peptide synthetase (microcystin synthetase) that is specifically involved in the biosynthesis of microcystins. Our results confirm that microcystins are synthesized non-ribosomally and that a basic difference between toxic and non-toxic strains of M. aeruginosa is the presence of one or more genes coding for microcystin synthetases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2958.1997.6131982.x
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  • 5
    Electronic Resource
    Electronic Resource
    Improved methods for in situ enzymatic amplification and detection of low copy number genes in bacteria (1997)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 152 (1997), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: We present alternative and improved protocols for in situ analysis of single copy genes in prokaryotes. Primed in situ amplification (PRINS) and cycle PRINS were used to detect, via the incorporation of a fluorescein labelled nucleotide, the presence of specific genes carried on both high and low copy number plasmids in individual cells of Escherichia coli and a marine bacterium, SW5. The optimised protocols described enabled a significant reduction in non-specific signals whilst maintaining high fluorescent activity via labelled nucleotide incorporation. In addition, nucleic acids were amplified linearly and were retained within the permeabilised microbial cells. These methods provide considerable advances in sensitivity, specificity and reliability compared to current protocols for bacterial in situ nucleic acid amplification.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1997.tb10410.x
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  • 6
    Electronic Resource
    Electronic Resource
    The expansion of mechanistic and organismic diversity associated with non-ribosomal peptides (2000)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 191 (2000), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Non-ribosomal peptides are a group of secondary metabolites with a wide range of bioactivities, produced by prokaryotes and lower eukaryotes. Recently, non-ribosomal synthesis has been detected in diverse microorganisms, including the myxobacteria and cyanobacteria. Peptides biosynthesized non-ribosomally may often play a primary or secondary role in the producing organism. Non-ribosomal peptides are often small in size and contain unusual or modified amino acids. Biosynthesis occurs via large modular enzyme complexes, with each module responsible for the activation and thiolation of each amino acid, followed by peptide bond formation between activated amino acids. Modules may also be responsible for the enzymatic modification of the substrate amino acid. Recent analysis of biosynthetic gene clusters has identified novel integrated, mixed and hybrid enzyme systems. These diverse mechanisms of biosynthesis result in the wide variety of non-ribosomal peptide structures and bioactivities seen today. Knowledge of these biosynthetic systems is rapidly increasing and methods of genetically engineering these systems are being developed. In the future, this may lead to rational drug design through combinatorial biosynthesis of these enzyme systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.2000.tb09334.x
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  • 7
    Electronic Resource
    Electronic Resource
    On the presence of peptide synthetase and polyketide synthase genes in the cyanobacterial genus Nodularia (2001)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 196 (2001), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Nodularin is a hepatotoxin produced by the bloom-forming cyanobacterial species Nodularia spumigena. Putative peptide synthetase and polyketide synthase genes were detected in toxic strains of Nodularia by degenerate PCR. Using specific primer sets, peptide synthetase and polyketide synthase gene homologues were detected in nodularin-producing strains indicating a possible role of peptide synthetase and polyketide synthase enzyme complexes in the biosynthesis of nodularin. Strains of Nodularia isolated from around the world were also analyzed for the production of nodularin by the protein phosphatase 2A inhibition assay. The protein phosphatase inhibition assay and the molecular detection of peptide synthetase and polyketide synthase genes in Nodularia may be useful techniques for the assessment of nodularin-producing cyanobacteria in the environment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.2001.tb10566.x
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  • 8
    Electronic Resource
    Electronic Resource
    Genetic potential for secondary metabolite production in stromatolite communities (2005)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 243 (2005), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The cyanobacterial communities associated with stromatolites surviving in extreme habitats are a potentially rich source of bioactive secondary metabolites. We screened for the potential for production of bioactive metabolites in diverse species of cyanobacteria isolated from stromatolites in Hamelin Pool, Shark Bay, Australia. Using degenerate primer sets, putative peptide synthetase and polyketide synthase genes were detected from strains of Symploca, Leptolyngybya, Microcoleus, Pleuorocapsa, and Plectonema sp. Sequence analysis indicates the enzymes encoded by these genes may be responsible for the production of different secondary metabolites, such as hepatotoxins and antibiotics. Computer modelling was also conducted to predict the putative amino acid recognised by the unknown adenylation domain in the NRPS sequences. Mass spectral analysis also allowed the putative identification of the cyclic peptides cyanopeptolin S and 21-bromo-oscillatoxin A in two of the isolates. This is the first time evidence of secondary metabolite production has been shown in stromatolite-associated microorganisms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/j.femsle.2004.12.019
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  • 9
    Electronic Resource
    Electronic Resource
    Ecological and molecular investigations of cyanotoxin production (2001)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology ecology 35 (2001), S. 0 
    Details
    ISSN: 1574-6941
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6941.2001.tb00782.x
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  • 10
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    Alexandrium diversaporum sp. nov., a new non-saxitoxin producing species: Phylogeny, morphology and sxtA genes (2014)
    ELSEVIER SCIENCE BV
    In:  EPIC3Harmful Algae, ELSEVIER SCIENCE BV, 31, pp. 54-65, ISSN: 1568-9883
    Details
    Publication Date: 2019-07-16
    Description: Species of the PST producing planktonic marine dinoflagellate genus Alexandrium have been intensively scrutinised, and it is therefore surprising that new taxa can still be found. Here we report a new species, Alexandrium diversaporum nov. sp., isolated from spherical cysts found at two sites in Tasmania, Australia. This species differs in its morphology from all previously reported Alexandrium species, possessing a unique combination of morphological features: the presence of 2 size classes of thecal pores on the cell surface, a medium cell size, the size and shape of the 600 , 10 , 20000 and Sp plates, the lack of a ventral pore, a lack of anterior and posterior connecting pores, and a lack of chain formation. We determined the relationship of the two strains to other species of Alexandrium based on an alignment of concatenated SSU-ITS1, 5.8S, ITS2 and partial LSU ribosomal RNA sequences, and found A. diversaporum to be a sister group to Alexandrium leei with high support. A. leei shares several morphological features, including the relative size and shapes of the 600 , 10 , 20000 and Sp plates and the fact that some strains of A. leei have two size classes of thecal pores. We examined A. diversaporum strains for saxitoxin production and found them to be non-toxic. The species lacked sequences for the domain A4 of sxtA, as has been previously found for non-saxitoxin producing species of Alexandrium.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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