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Politics : Formerly About Advanced Micro Devices -- Ignore unavailable to you. Want to Upgrade?

To: longnshort who wrote (338781)	5/27/2007 12:46:05 PM
From: combjelly	Read Replies (1) \| Respond to of 1575608

"Evidence given for the drug's direct effects on birds was particularly thin." Cute. A pun. Umm, dunno about the evidence that Dr. Carson had or used. However, research has shown that raptorial birds are very sensitive to DDT and/or DDE. Not so much for other birds like quail. DDT and its metabolites can lower the reproductive rate of birds by causing eggshell thinning (which leads to egg breakage) and by causing embryo deaths. However, different groups of birds vary greatly in their sensitivity to these chemicals; predatory birds are extremely sensitive and, in the wild, often show marked shell thinning, whilst gallinaceous birds are relatively insensitive. Because of the difficulties of breeding birds of prey in captivity, most of the experimental work has been done with insensitive species, which have often shown little or no shell thinning. The few studies on more sensitive species have shown shell thinning at levels similar to those found in the wild. The lowest dietary concentration of DDT reported to cause shell thinning experimentally was 0.6 mg/kg for the black duck. The mechanism of shell thinning is not fully understood. inchem.org