Made mostly of collagen, bone is living, growing tissue. Collagen is a protein that provides a soft framework, and calcium phosphate is a mineral that adds strength and hardens the framework. This combination of collagen and calcium makes bone strong and flexible enough to withstand stress.
Psychrotrophic bacteria are defined as those that grow at 7Â°C, although their optimal growth temperature is higher. During cold storage after milk collection they dominate the flora, and their extracellular enzymes, mainly proteases and lipases, contribute to the spoilage of dairy products.
1 8. 2  Heterotroph Bacteria Heterotroph Bacteria, is a bacteria that requires organic substrates to get its chemical energy for growth and development. 3  Heterotroph Bacteria is divided into 4 types: â¢ Parasite Bacteria â¢ Saprophyte Bacteria â¢ Pathogen Bacteria â¢ NonPathogen Bacteria. 4  9. It has been known for 150 years that these bacteria play an important part in oxidizing and fixing iron. 2  8. 3  Heterotroph Bacteria Heterotroph Bacteria, is a bacteria that requires organic substrates to get its chemical energy for growth and development.