quantum requirement

quan·tum re·quire·ment

the number of quanta of light absorbed required for the transformation of one molecule; the inverse of the quantum yield.
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Unlike requirements for citizenship in most other nations across the globe, a minimum blood quantum requirement ensures that citizenship will eventually become unattainable, leading to eventual termination.
Passing on the perceived physical traits of an Indian became a powerful motivator to some Osage, who argued that a blood quantum requirement would make future generations of Osage visibly different from the surrounding white population and thus ensure Osage recognition.
Carolina, who increased their blood quantum requirement from one
quantum requirement; the tribe's previous open enrollment standard
had no quantum requirement. Enrollment officer Jane McKane indicated
quantum requirement to one-quarter, choosing "entrenchment"
The blood quantum requirement was approved by the community in a referendum held in 1990.
There is no enrollment or blood quantum requirement; a student must simply demonstrate a family relationship with someone who is or was enrolled in a federally recognized tribe.
He found that 204 tribes had some minimum blood quantum requirement, while the remaining ninety-eight had none; see Thornton, "Tribal Membership Requirements and the Demography of `Old' and `New' Native Americans," Population Research and Policy Review 16 (1997): 37.
In practice, however, adoptions tend to be rather rare and to be limited to certain categories of people--members' spouses, reservation residents, children who meet a blood quantum requirement but whose parents are not enrolled, and so on.
A significant number of tribes--almost one-third of those populating the lower forty-eight states--have rejected specific blood quantum requirements for determining tribal citizenship.
-- leading some tribes in recent years to eliminate or reduce their blood quantum requirements. Also, many Native Americans don't live on reservations, speak Native languages or ''look'' Indian, making others question their bloodline claims.