Negro Harlem: An Ecological Study

Designing an Ecological Study

Ecology can be defined as the study of ecological systems. A system is any set of components, living or nonliving, that are tied together by regular interactions. An ecological system is made up of one or more organisms, together with the nonliving environment with which they interact. Ecological systems exist at several different levels of organization. An ecological system can be a single org...

Choriodal melanoma in an African Negro.

Case Report A male African Negro aged 48 years from the Eastern Districts of Rhodesia, came to the Eye Unit of Harari Hospital, Salisbury, Rhodesia, in October, 1965, with the story that he had been struck on the right eye with a stick 2 months before. Examination.-The right eye was blind and cataractous. A deeply pigmented mass, partially covered by stretched conjunctiva, extended from the glo...

Bittersweet Recollection: An Ecological Study of Nostalgia

Nostalgia has recently grown as a popular subject of study. Much of the research on it, however, has not been conducted in a naturalistic way. The current experiments use a diary study to analyze aspects of nostalgia in a natural setting, including its emotional timeline and selfrelevance. Results found that nostalgia can behave like an involuntary memory and indeed has an emotional curve. Resu...

Malaria in Europe: An Ecological Study

An ecological study on childhood autism

BACKGROUND AND METHODS Idiopathic autism, suspected to be caused by exposure of genetically susceptible individuals to unknown environmental triggers, has increased dramatically in the past 25 years. The objectives of our study were to determine, using a linear regression model, whether the county prevalence of autism in the Pacific Northwest of the United States was associated with the source ...