Cell Cycle Dynamics and the Physiology of Saxitoxin Biosynthesis in Alexandrium Fundyense (Dinophyceae) PDF Download
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Author: Gaspar Taroncher Oldenburg Publisher: ISBN: Category : Biology Languages : en Pages : 738
Book Description
Marine dinoflagellates in the genus Alexandrium synthesize Saxitoxin (STX) and several of its derivatives. The aim of this thesis was to analyze novel aspects of toxigenesis and the cell cycle in Alexandrium and to apply molecular techniques to gain new insights on the regulation of STX biosynthesis. Synchronized cultures of A. fundyense were studied to determine the dynamics of toxin production throughout the cell cycle. STX biosynthesis was shown to be discontinuous and constrained to approximately 10 hours at the beginning of G1. Two cell cycle transition points were identified: a light-dependent one and a size-dependent one. Semi-continuous cultures of A. fundyense were used to determine the effects of temperature and phosphate limitation on the coupling of STX biosynthesis to O%. Inferred toxin production rates were constant and correlated to G1 over a range of growth rates. The effects of phosphate on STX biosynthesis were analyzed and a scheme of interconversions among STX derivatives is proposed. Differential Display (DD) analysis was applied to the identification of up- or downregulated genes during toxigenesis in A. fundyense. The expression patterns of S-adenosylhomocysteine hydrolase, methionine aminopeptidase and a histone-like protein were related to periods of STX biosynthesis.
Author: Gaspar Taroncher Oldenburg Publisher: ISBN: Category : Biology Languages : en Pages : 738
Book Description
Marine dinoflagellates in the genus Alexandrium synthesize Saxitoxin (STX) and several of its derivatives. The aim of this thesis was to analyze novel aspects of toxigenesis and the cell cycle in Alexandrium and to apply molecular techniques to gain new insights on the regulation of STX biosynthesis. Synchronized cultures of A. fundyense were studied to determine the dynamics of toxin production throughout the cell cycle. STX biosynthesis was shown to be discontinuous and constrained to approximately 10 hours at the beginning of G1. Two cell cycle transition points were identified: a light-dependent one and a size-dependent one. Semi-continuous cultures of A. fundyense were used to determine the effects of temperature and phosphate limitation on the coupling of STX biosynthesis to O%. Inferred toxin production rates were constant and correlated to G1 over a range of growth rates. The effects of phosphate on STX biosynthesis were analyzed and a scheme of interconversions among STX derivatives is proposed. Differential Display (DD) analysis was applied to the identification of up- or downregulated genes during toxigenesis in A. fundyense. The expression patterns of S-adenosylhomocysteine hydrolase, methionine aminopeptidase and a histone-like protein were related to periods of STX biosynthesis.
Author: Donald Mark Anderson Publisher: Springer ISBN: Category : Science Languages : en Pages : 696
Book Description
Proceedings of the NATO Advanced Study Institute on "The Physiological Ecology of Harmful Algal Blooms", held at the Bermuda Biological Station for Research, Bermuda, May 27- June 6, 1996
Author: E. Granéli Publisher: Springer Science & Business Media ISBN: 9783540740094 Category : Nature Languages : en Pages : 448
Book Description
Harmful algal can cause a variety of deleterious effects, including the poisoning of fish and shellfish, habitat disruptions for many organisms, water discoloration, beach fouling, and even toxic effects for humans. In this volume, international experts provide an in-depth analysis of harmful algae topics and offer a comprehensive synthesis of the latest research in the field.
Author: Ruma Pal Publisher: Springer ISBN: 8132218388 Category : Science Languages : en Pages : 175
Book Description
The book , ‘An Introduction to Phytoplanktons - Diversity and Ecology’ is very useful as it covers wide aspects of phytoplankton study including the general idea about cyanobacteria and algal kingdom. It contains different topics related to very basic idea of phytoplanktons such as, types ,taxonomic description and the key for identification etc. Together with it, very modern aspects of phytoplankton study including different methodologies needed for research students of botany, ecology, limnology and environmental biology are also included. The first chapter is very basic and informative and describes algal and phytoplankton classification, algal pigments, algal bloom and their control, algal toxins, wetlands algae, ecological significance of phytoplanktons etc. A general key for identification of common phytoplankton genera is also included for students who will be able to identify these genera based on the light microscopic characters. In Chapters 2-4, different aspects of phytoplankton research like primary productivity, community pattern analysis and their ecological parameter analysis have been discussed with detailed procedures. Statistical analysis is also discussed in detail. Chapter 5 includes case studies related to review, phytoplankton diversity and dynamics.
Author: Hans P. Egmond Publisher: Food & Agriculture Org. ISBN: 9789251051290 Category : Medical Languages : en Pages : 300
Book Description
This paper provides an extensive review of different aspects of five shellfish-poisoning syndromes (paralytic, diarrhoeic, amnesic, neurologic and azapiracid), as well as one fish-poisoning syndrome (ciguatera fish poisoning), and discusses in detail the causative toxins produced by marine organisms, chemical structures and analytical methods of the toxins, habitat and occurrence of the toxin-producing organisms, case studies and existing regulations. Based on this analysis, risk assessments are carried out for each of the toxins, and recommendations are elaborated to improve the management of these risks in order to reduce the harmful effect of these toxins on public health.
Author: Patricia M. Glibert Publisher: Springer ISBN: 3319700693 Category : Science Languages : en Pages : 460
Book Description
Harmful algal blooms (HABs) - blooms that cause fish kills, contaminate seafood with toxins, or cause human or ecological health impacts and harm to local economies - are occurring more often, in more places and lasting longer than in past decades. This expansion is primarily the result of human activities, through increased nutrient inputs and various aspects of climate change. The Global Ecology and Oceanography of Harmful Algal Blooms (GEOHAB) programme promoted international collaboration to understand HAB population dynamics in various oceanographic regimes and to improve the prediction of HABs. This volume introduces readers to the overarching framework of the GEOHAB programme, factors contributing to the global expansion of harmful algal blooms, the complexities of HABs in different habitats, and the forward-looking issues to be tackled by the next generation of GEOHAB, GlobalHAB. The programme brought together an international team of contributing scientists and ecosystem managers, and its outcomes will greatly benefit the international research community.
Author: Gaspar Taroncher Oldenburg
Author: Gaspar Taroncher Oldenburg
Author: 
Author: 
Author: Donald Mark Anderson
Author: Woods Hole Oceanographic Institution
Author: Donald Mark Anderson
Author: E. Granéli
Author: Ruma Pal
Author: Hans P. Egmond
Author: Patricia M. Glibert