Detailansicht
Silicon Biomineralization
Biology Biochemistry Molecular Biology Biotechnology, Progress in Molecular and Subcellular Biology 33
ISBN/EAN: 9783642624513
Umbreit-Nr.: 5649040
Sprache:
Englisch
Umfang: xiii, 340 S.
Format in cm:
Einband:
kartoniertes Buch
Erschienen am 17.08.2012
Auflage: 1/2003
- Zusatztext
- During evolution silica deposition has been used in Protozoa, Metazoa and in plants as skeletal elements. It appears that the mechanisms for the formation of biogenic silica have evolved independently in these three taxa. In Protozoa and plants biosilicification appears to be primarily driven by non-enzymatic processes and procedes on organic matrices. In contrast, in sponges (phylum Porifera) this process is mediated by enzymes; the initiation of this process is likewise dependent on organic matrices. In this monograph the role of biosilica as stabilizing structures in different organisms is reviewed and their role for morphogenetic processes is outlined. It provides an up-to-date summary of the mechanisms by which polymeric biosilica is formed. The volume is intended for biologists, biochemists and molecular biologists, involved in the understanding of structure formation in living organisms and will also be very useful for scientists working in the field of applied Nanotechnology and Nanobiotechnology.
- Kurztext
- InhaltsangabeOrganisms: Diatoms.- Living Inside a Glass Box-Silica in Diatoms.- 1 Introduction.- 2 Silica in Protozoa, Sponges and Higher Plants.- 2.1 Phaeodaria.- 2.2 Choanoflagellates.- 2.3 Silicoflagellates.- 2.4 Sponges.- 2.5 Plants.- 3 Living in a Glass Box-the Diatoms.- 4 Biosilicification in Diatoms.- 5 Conclusion.- References.- Components and Control of Silicification in Diatoms.- 1 Introduction.- 2 Features of Diatom Cell Walls and Terminology.- 3 Transport of Silicic Acid into the Diatom Cell.- 4 Intracellular Silicic Acid Transport.- 5 Micromorphogenesis vs.Macromorphogenesis.- 5.1 Micromorphogenesis-the Nanostructure of Diatom Biosilica.- 5.2 Control of Micromorphogenesis.- 6 Macromorphogenesis-the Formation of Large-Scale Silicified Structures in the Diatom Cell Wall.- 7 The Silica Deposition Vesicle-the "Black Box" in the Process of Silicification.- 8 Conclusions and Future Prospects.- References.- The Phylogeny of the Diatoms.- 1 Introduction.- 2 Approaches to Reconstruct Phylogenies.- 3 The Diatom Silica Frustule.- 3.1 Morphology of the Silica Frustule.- 3.2 Taxonomy Based on Characteristics of the Silica Frustule.- 3.3 The Phylogeny Inferred from Nuclear SSU rDNA Sequences.- 3.4 Phylogenetic Relevance of Taxonomy and Frustule Characters.- 3.4.1 The Radial Centrics.- 3.4.2 The Bipolar Centrics.- 3.4.3 The Bipolar Centric Toxarium.- 3.4.4 The Araphid Pennates.- 3.4.5 The Position of Pseudohimantidium.- 3.4.6 The Raphid Pennates.- 4 Phylogenetic Signal in Diatom Chloroplast Structure.- 5 Phylogenetic Signal in the Life Cycle and Auxospore Ontogeny.- 5.1 Gamete Formation.- 5.2 Auxospore Development.- 6 The Phylogenetic Position of the Diatoms Within Heterokonta.- 6.1 The Ancestry of the Diatoms.- 6.2 Origin of Pigmented Heterokontophyta and the End Permian Mass Extinction.- 6.3 Origin of the Silica Cell Wall Within Heterokonta.- 7 Historical Ecology.- 8 Palaeontology and Phylogeny.- 9 Conclusions.- References.- Silicon-a Central Metabolite for Diatom Growth and Morphogenesis.- 1 Introduction.- 2 Silicon Uptake and Transport: Regulation and Influencing Factors.- 2.1 Uptake, Transport and Soluble Pools.- 2.2 Energy Requirement.- 2.3 Factors Affecting the Uptake and Transport Processes.- 3 Link Between Silicon Metabolism, Growth and Cell Division.- 3.1 Coupling Between Silicon Metabolism and Cell Growth.- 3.2 Cell-Cycle Regulation.- 4 Diatom Morphogenesis.- 4.1 Overview of the Morphogenesis Process.- 4.2 Differentiation Programs Involving Silicon Morphogenesis.- 5 Morphological Plasticity and Variation.- 5.1 Size Reduction and Polymorphism.- 5.2 Impact of Growth Conditions and Environment.- 5.2.1 Light, Major Nutrients and Temperature.- 5.2.2 Salinity and Osmotic Stress.- 5.2.3 Trace Elements and Pollutants.- 6 Regulatory Mechanisms in Silicon Metabolism and Morphogenesis.- References.- Organisms: Higher Plants.- Functions of Silicon in Higher Plants.- 1 Introduction.- 2 Beneficial Effects of Silicon in Different Plant Species.- 2.1 Si-Accumulating Plants Versus Si Nonaccumulating Plants.- 2.2 Accumulation Process of Si in Si-Accumulating Plants.- 2.3 Effect of Si on the Growth of Si-Accumulating Plants.- 2.4 Effect of Si on the Growth of Si Nonaccumulating Plants.- 3 Functions of Si in Higher Plants.- 3.1 Stimulation of Photosynthesis.- 3.2 Alleviation of Physical Stress.- 3.2.1 Radiation Damage.- 3.2.2 Water Stress.- 3.2.3 Climatic Stress.- 3.3 Improvement of Resistance to Chemical Stress.- 3.3.1 Nutrient Imbalance Stress.- 3.3.1.1 Phosphorus Deficiency and Excess 13.- 3.3.1.2 N Excess 13.- 3.3.2 Metal Toxicity Stress.- 3.3.2.1 Mn and Fe Toxicity 14.- 3.3.2.2 Na Excess 14.- 3.3.2.3 Al Toxicity 14.- 3.4 Increase in Resistance to Abiotic Stress.- 3.4.1 Disease.- 3.4.2 Pests.- 4 Conclusion.- References.- Silicon in Plants.- 1 Introduction.- 2 Silicon in Monocots.- 2.1 SiO2 Deposits in Monocots.- 2.2 Silicic Acid in Monocots.- 3 Si in Dicots.- 4 Si in Cell Walls.- 5 Formation of SiO2 Deposits in Plants.- 6 Uptake and Long-Distance