Ecological classification or Ecological typology is the classification of land or water into geographical units that represent variation in one or more ecological features. Traditional approaches focus on geology, topography, biogeography, soils, vegetation, climate conditions, living species, habitats, water resources, and sometimes also anthropic factors. Most approaches pursue the cartographical delineation or regionalisation of distinct areas for mapping and planning.
vitamin c, also known as ascorbic acid and ascorbate, is a vitamin found in various foods and sold as a dietary supplement. it is used to prevent and treat scurvy. vitamin c is an essential nutrient involved in the repair of tissue and the enzymatic production of certain neurotransmitters. it is required for the functioning of several enzymes and is important for immune system function. it also functions as an antioxidant.
vitamin k is a group of structurally similar, fat-soluble vitamins found in foods and in dietary supplements. the human body requires vitamin k for complete synthesis of certain proteins that are needed for blood coagulation (k from koagulation, danish for "coagulation") or for controlling binding of calcium in bones and other tissues. the vitamin k–related modification of the proteins allows them to bind calcium ions, which they cannot do otherwise. without vitamin k, blood coagulation is seriously impaired, and uncontrolled bleeding occurs. preliminary clinical research indicates that deficiency of vitamin k may weaken bones, potentially leading to osteoporosis, and may promote calcification of arteries and other soft tissues.
vitamin a is a group of unsaturated nutritional organic compounds that includes retinol, retinal, retinoic acid, and several provitamin a carotenoids (most notably beta-carotene). vitamin a has multiple functions: it is important for growth and deve
lopment, for the maintenance of the immune system, and for good vision. vitamin a is needed by the retina of the eye in the form of retinal, which combines with protein opsin to form rhodopsin, the light-absorbing molecule necessary for both low-light (scotopic vision) and color vision. vitamin a also functions in a very different role as retinoic acid (an irreversibly oxidized form of retinol), which is an important hormone-like growth factor for epithelial and other cells.
It is responsible for the rigidity of the bacterial cell wall.