Africa's orphan crisis: two community-based models of care.

The AIDS epidemic has created a crisis for children, severely threatening the health and development of children whose parents are ill, have died and whose communities have lost a large percentage of their adults. Even when extended family can serve as guardians, their need to work in the context of widespread poverty decreases the amount of time they are able to spend with children. Other children live in child-headed households or with seniors unable to provide adequate care.

[Variation of pyrolysis products from Salmonella typhi-murium during subculturing (author's transl)].

Consecutive subculturing of the same bacterial strain over a period of time resulted in variations of relative concentration of pyrolysis products. It is recommended that judicious care should be taken in the choice of these products used for taxonomic purposes.