Regional differences invalidate U.S. sperm trend conclusions.
نویسندگان
چکیده
منابع مشابه
Regional differences invalidate U.S. sperm trend conclusions.
-Patients with melanoma who had one or more close relatives with melanoma were studied for their natural-killer-cell (NK) activity against cultured melanoma cells and Chang cells. A high proportion of the patients and their relatives were found to have low NK activity against these target cells. In most of the patients this could not be attributed to general depression of their immune function,...
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متن کاملU.S. sperm trend conclusions.
The letter written by Heinze (1) has serious shortcomings. Heinze wrote that There is not a single study of healthy men from any fertility center or sperm bank that has reported a decline in sperm counts in the United States. This is not true. A number of such studies exist. Leto and Frensilli (2) documented a decline in sperm counts in potential sperm donors from all over the United States in ...
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We present 127 years of data on the physical stature of military conscripts born in Italy during 1854-1980, as well as an analysis of regional variations in height (for birth cohorts born during 1927-1980). The height of young men has increased in all regions of Italy. The secular trend and the regional changes in stature are correlated with economic growth and a general improvement of living c...
متن کاملRegional differences
The skin is a complex landscape containing regions in which hair follicles exhibit different types of behavior.
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ژورنال
عنوان ژورنال: Environmental Health Perspectives
سال: 1999
ISSN: 0091-6765,1552-9924
DOI: 10.1289/ehp.107-1566384