lec10 - Wildlife :what and where 6 Dose Response:Concept 7...

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1 Lecture 8 : Environmental Health, Pollution, and Toxicology Lecture Outline Some Basic Terms Types of Sources Nature Can Be Toxic Effects on Humans & Wildlife, Pathways Concept of Dose -Response Ecological Gradient,Tolerance,& Acute to Chronic Effects Concept of Dose - Response Ecological Gradient,Tolerance,& Acute to Chronic Effects Some Examples Risk Assessment
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2 Basic Terms Disease Pollution ,Contamination Toxic (poisonous)Toxicology (study of toxins) Carcinogen (toxin that causes cancer) Synergism Biomagnification Types of Sources Point (ex-smoke stack) Area ( ex-agricultural use of pesticide) Mobile (ex- automobiles)
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3 Point Source Mobile Sources
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4 Natural Toxins and Pollutants Radon gas(potentially very serious) Carbon dioxide (Lake Nyos, Africa,1986,over 1,500 deaths) Asbestos in water ( Great Lakes case history) Wildfire (particulates) Pathways
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5 People:what and where
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Unformatted text preview: Wildlife :what and where 6 Dose Response:Concept 7 8 Ecological Gradient 9 Tolerance Increase in ability to withstand stress from exposure to pollutant Example ozone (UCSB students experiments) Acute & Chronic Effects Acute --- occurs soon after exposure,usually is exposure to relative high dose Chronic --- longer ,often low level exposure 10 Examples Infectious Agents HAAs POPs Heavy Metals Particulates Sound Thermal Infectious Agents 11 Decasualization and Feminization 12 POPs: Common Properties Carbon-base ,often with chlorine Manufactured by humans (synthetic) Persistent in the environment Polluting and toxic Soluble in fat--tend to accumulate Occur in forms that allow transport for long distances by wind,water ,and with sediment POPs 13 POP:Dioxin ,Times Beach Mo,1980s Lead in the city...
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lec10 - Wildlife :what and where 6 Dose Response:Concept 7...

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