10 Population Dynamics â¢â¯Metapopulations A metapopulation is a population of populations. Metapopulations Metapopulations âspatially isolated populations that are linked by the dispersal of individuals. Metapopulations are characterized by repeated extinctions and colonizations.
Osteopenia is a condition in which bone mineral density is lower than normal. It is considered by many doctors to be a precursor to osteoporosis.ike osteoporosis, osteopenia occurs more frequently in post-menopausal women as a result of the loss of estrogen. It can also be exacerbated by lifestyle factors such as lack of exercise, excess consumption of alcohol, smoking or prolonged use of glucocorticoid medications.
Necrotizing sialometaplasia. Necrotizing sialometaplasia (NS) is a benign, ulcerative lesion, usually located towards the back of the hard palate. It is thought to be caused by ischemic necrosis (death of tissue due to lack of blood supply) of minor salivary glands in response to trauma. Often painless, the condition is self-limiting and should heal in 6â10 weeks.