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.
Psychrophiles. Bacteria that grow at temperatures in the range of -5 o C to 30 o C, with optimum temperatures between 10 o C and 20 o C, are called psychrophiles. These microbes have enzymes that catalyze best when the conditions are cold, and have cell membranes that remain fluid at these lower temperatures.pper and Lower Values, and Temperature Range Some species of microorganism can grow at temperatures as low as -10 o C, and others at temperatures as high as 100 o C-or higher. These upper and lower values are a function of cell metabolism.