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Microbial Metabolism
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Lactic Acid Fermentation
Key products: Lactic acid, NAD+. Significance: Enables ATP production under anaerobic conditions, regenerates NAD+ for glycolysis.
Nitrification
Key products: Nitrate, ATP. Significance: Oxidizes ammonia to nitrate, integral part of the nitrogen cycle, used in wastewater treatment.
Sulfur Oxidation
Key products: Sulfate, ATP. Significance: Enables certain bacteria to use sulfur as an energy source, contributes to the sulfur cycle.
Nucleotide Synthesis
Key products: ATP, GTP, CTP, UTP, TTP. Significance: Nucleotides are essential for DNA/RNA synthesis and energy transfer within cells.
Photosynthesis
Key products: Glucose, oxygen. Significance: Converts light energy into chemical energy, fundamental for life on Earth and oxygen production.
Alcoholic Fermentation
Key products: Ethanol, CO2, NAD+. Significance: Used by yeasts to generate energy anaerobically, important in baking and alcoholic beverage production.
Ammonification
Key products: Ammonia, ATP. Significance: Decomposes organic nitrogen to ammonia, important for nitrogen recycling in ecosystems.
Citric Acid Cycle (TCA Cycle)
Key products: ATP, NADH, FADH2, CO2. Significance: Important for aerobic energy production, provides intermediates for biosynthesis.
Lipopolysaccharide Synthesis
Key products: Lipopolysaccharides (LPS). Significance: Main component of the outer membrane of Gram-negative bacteria, endotoxin.
Hydrogen Oxidation
Key products: Protons, electrons, ATP. Significance: Converts molecular hydrogen (H2) to protons and electrons, provides energy for certain bacteria.
Electron Transport Chain
Key products: ATP, water. Significance: Major source of ATP in aerobic organisms, uses electrons from NADH and FADH2.
Anammox (Anaerobic Ammonium Oxidation)
Key products: Nitrogen gas, water. Significance: Converts ammonium directly to nitrogen gas under anoxic conditions, contributes to nitrogen loss from ecosystems.
Nitrogen Fixation
Key products: Ammonia. Significance: Converts atmospheric nitrogen (N2) to a biologically usable form (NH3), crucial for the nitrogen cycle.
Anoxygenic Photosynthesis
Key products: ATP, reduced organic or inorganic compounds. Significance: Enables photosynthesis without oxygen production, found in purple and green sulfur bacteria.
Denitrification
Key products: Nitrogen gas (N2), ATP. Significance: Converts nitrates into nitrogen gas, releasing fixed nitrogen back to the atmosphere.
Amino Acid Synthesis
Key products: Amino acids. Significance: Provides building blocks for protein synthesis, essential for all cellular functions.
Pentose Phosphate Pathway
Key products: NADPH, ribose-5-phosphate. Significance: Provides reducing power (NADPH) and precursors for nucleotide synthesis.
Methanogenesis
Key products: Methane, ATP. Significance: Last step in the decomposition of organic compounds in anaerobic environments, major source of natural gas.
Nitrate Reduction
Key products: Nitrite, ATP. Significance: Part of the anaerobic respiration in certain bacteria, important in the nitrogen cycle.
Iron Reduction
Key products: Ferrous iron (Fe2+), ATP. Significance: Important for the energy metabolism of iron-reducing bacteria, plays a role in biogeochemical cycling.
Iron Oxidation
Key products: Ferric iron (Fe3+), ATP. Significance: Involved in energy metabolism for certain chemolithoautotrophic bacteria, contributes to the iron cycle.
Methylotrophy
Key products: Formaldehyde, ATP. Significance: Utilizes one-carbon compounds such as methanol for growth, important for carbon cycling.
Peptidoglycan Synthesis
Key products: Peptidoglycan. Significance: Provides structural support for bacterial cell walls; target for antibiotic action.
Sulfate Reduction
Key products: Hydrogen sulfide, ATP. Significance: Provides energy for certain anaerobic bacteria, contributes to the sulfur cycle.
Polymer Synthesis
Key products: Biopolymers (e.g., polyhydroxybutyrate). Significance: Microbes produce biodegradable plastics, serves as carbon and energy storage.
Sulfur Reduction
Key products: Hydrogen sulfide, ATP. Significance: Microbial metabolism that derives energy by reducing elemental sulfur to sulfide.
Calvin Cycle
Key products: G3P, ADP, NADP+. Significance: Carbon fixation process in photosynthesis, converts CO2 to glucose.
Chemosynthesis
Key products: Organic compounds, ATP. Significance: Supports ecosystems without sunlight, uses chemical energy from inorganic compounds.
Glycolysis
Key products: Pyruvate, ATP, NADH. Significance: Central pathway for glucose catabolism, provides energy and precursors for other pathways.
Fatty Acid Synthesis
Key products: Fatty acids. Significance: Creates fatty acids for energy storage, membrane synthesis, and signaling molecules.
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