NOVELTY - Chitosan/chitin-calcium phosphate composites having antibacterial properties, where the chitosan is derived from crayfish, aragonite, calcite and vaterite.    USE - The chitosan is useful for differentiating stem cells for treating diseases e.g. brain disorder, where the stem cell are differentiated into white cells, T-cells, macrophages, phagocytosis and B-cells. The chitosan is useful for delivering genes for treating and/or preventing chronic inflammation-related diseases e.g. chronic inflammation, thrombosis, atherosclerosis, restenosis, chronic venous insufficiency, recurrent bacterial infections, sepsis, cutaneous infections, renal disease, glomerulonephritis, fibrotic lung disease, allergic disease, irritable bowel syndrome (IBS), rheumatoid arthritis, and acute bronchiolitis, central nervous system-macroglia and neurodegenerative diseases, e.g. Alzheimer's disease, multiple sclerosis, Parkinson's disease, neuroinflammation, HIV-associated neurological diseases, HIV-associated dementia, CNS bacterial infections, brain Toxoplasma gondii, Acanthamoeba infections, Listeria infections, prion diseases, subacute spongiform encephalopathies macular degeneration, cancer and AIDS/HIV. The chitosan is used in the form of tooth paste, mouth wash, gum and/or candy mints for fresh breath to avoid or remove bad odors. The chitosan is used in the form of powder to treat foot odor, dry and remove odor from shoes and/boots that are wet inside, kitchen clothing, fabric softener, carpet powder, spray/powder for all home furniture, hospital, office and leisure. The chitosan is used for detoxification for nitrogen fixation, used as fertilizer and used for sewage or tea manure and/or all organic wastages. The chitosan is used in food and beverage industries, e.g. used as soups for animals. The chitosan can be used as detergent, wet and dry tissue and toilet paper. The chitosan used for refining any and all petroleum and biofuels GP10%. The chitosan is used as a spray on preservatives such as wood. The chitosan is used for preventing microbes (antibiotic resistant infections) from building biofilm. The chitosan is used as a spray (e.g. mix with drinks in hepatitis prevalent countries), and spray on cup to prevent all airborne disorders. The chitosan is slowly discharged to polluted rivers, lakes and/or wells, since chitosan is a renewable resource. The chitosan is used to refine oils and gases (all claimed).    ADVANTAGE - The chitosan has low toxicity, and prolongs the shelf life in fruits and vegetables.