Скачать или смотреть Inclusions in Bacteria| Storage Bodies| Granules

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1. Storage Bodies
Definition: Storage bodies are membrane-bound or membrane-less structures in bacteria that store excess nutrients or metabolic byproducts. They help the bacteria survive during periods of nutrient scarcity.
Composition: They typically store larger reserves of substances like:
Polyhydroxybutyrate (PHB) or other polyhydroxyalkanoates (PHA) (carbon storage).
Glycogen (a polysaccharide storage form of glucose).
Lipid droplets (fat storage).
Function: Serve as energy reserves, aiding the bacteria during times of starvation or stress. They also help bacteria adapt to environmental changes by storing compounds for later use.
Membrane-Bound: In many cases, they may be surrounded by a lipid monolayer or simple membrane-like structure, although not always.
2. Granules
Definition: Granules are smaller, non-membrane-bound aggregates of various substances that can include enzymes, metabolites, or ions.
Composition: Granules store smaller molecules, such as:
Inorganic phosphate (volutin or metachromatic granules).
Sulfur granules (found in sulfur-oxidizing bacteria).
Iron-containing granules (in magnetotactic bacteria).
Function: Serve specific roles such as:
Storing essential ions or compounds for metabolic reactions (e.g., phosphate for ATP production).
Contributing to structural or functional aspects, like sulfur granules aiding in redox reactions.
Iron granules helping bacteria orient along magnetic fields (magnetotaxis).
Non-Membrane-Bound: Granules are usually not enclosed by membranes and exist freely in the cytoplasm.
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