Model assumptions: Metapopulation models â¢â¯Homogenous patches â¢â¯No spatial structure â¢â¯No time lags â¢â¯Large number of patches. Metapopulations The development of metapopulation models has lead to research on: â¢â¯How to estimate factors that influence patch colonization and extinction.
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Osteogenic cells. Osteogenic cells are bipotential stem cells. They are present in two connective tissue layers: (1) the periosteum, which covers the outer surface of bone, and (2) the endosteum, which lines the internal surfaces of bone (e.g., central canals, marrow cavities, and spaces of spongy bone).s a consequence, the cells of the inner layer of the perichondrium differentiate into osteoblasts and start producing bone matrix. Now the perichondrium is considered a periosteum. Soon there is a collar of bone, called subperiosteal bone, surrounding the midsection of the cartilage.