Microbial Ecology 微生物生态学 - 欢迎光临湖北大学生命科学学院.ppt

Classification of population interaction 0, No effect; +, positive effect; -, negative effect. Iron cycles Bacterial iron reduction and oxidation Fe2+ + 1/4O2 + 2OH-1 + 1/2H2O Fe(OH)3 Pyrite 黄铁矿oxidationmetal bioleaching生物浸矿 One of the most common forms of iron and sulfur in nature is pyrite (FeS2), in mining operation, a slow chemical reaction occurs: FeS2 + 31/2O2 + H2O Fe2+ + 2SO42- + 2H+ Fe2+ Thiobacillus ferrooxidans Fe3+ FeS2 + 14Fe3+ + 8H2O 15Fe2+ + 2SO42- + 16H+ Probiotics for humans and animals Probiotics:益生菌 living microorganisms or substances to promote health and growth, has the potential to reestablish the natural balance and return the host to normal health and nutrition. Prebiotics: 益生素oligosaccharide寡糖 Synbiotic: the combination of prebiotics and probiotic microorganisms. How Probiotic microorganisms displace pathogen 1. Competition with pathogens for nutrients and adhesion sites 2. Inactivationof pathogenic bacterial toxins or metabolites 3. Production of substance that inhibit pathogen growth 4. Stimulation of nonspecific immunity Protential health benefits of probiotic microorganisms for humans 1. Anticarcinogenic 抗致癌activity 2. Control of intestinal pathogens 3. Improvement of lactose use in individuals who have lactose intolerance 4. Reduction in the serum cholesterol concentration Mycorrhizas Type of Mycorrhizas: Ectomycorrhiza and Endomycorrhiza Morphology and Function of Mycorrhizal Infection Mycorrhiza and Plant Nutrition Application Potential of VAM in Agricultural practice and Ecosystem Development and Application of Molecular Probes Construction and Analysis of Genomic Library Mycorrhizas Ectomycorrhizas Endomycorrhizas Ectendomycorrhizas Root Nodule Bacteria and Symbiosis with Legumes Stages in Nodule Formation Biochemistry of Nitrogen Fixation in Nodules Genetics of Nodule Formation: nod Genes Genetic Cooperativity in the R