Environmental Science Week 3
Environmental Science Week 3 10216 - BIO 105 - 04
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This 2 page Class Notes was uploaded by Brooke Yaffa on Sunday October 18, 2015. The Class Notes belongs to 10216 - BIO 105 - 04 at Grand Valley State University taught by Jennifer S Cymbola in Summer 2015. Since its upload, it has received 28 views. For similar materials see Environmental Science in Biology at Grand Valley State University.
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Date Created: 10/18/15
Environmental Science BIO 105 Chapter 3 September 2015 Brooke Yaffa Bisphenol A BPA chemical that was highly controversial due to the potential side effects Toxins Chemicals that cause direct damage upon exposure Natural Toxins Arsenic Synthetic Toxins BPA Persistent Chemicals Chemicals that don t readily degrade over time Risk Assessment Weighing the risks and benefits of a particular action in order to decide how to proceed Studies of EPA 339 2000 urine samples were taken 90 tested positive for EPA 339 Average concentration was 26 parts per billion ppb 339 Top 5 concentration was 16 ppb indicating a higher concentration in young people v EPA has low persistence and is fat soluble but liver and gut cells readily convert it to watersoluble form v EPA is an endocrine disruptor This means that EPA can bind to estrogen receptors and essentially make the body think that it is getting more estrogen than is needed Precautionary Principle The rule of thumb that calls for leaving a wide safety margin when the data about the potential for harm are uncertain Better safe than sorryquot Persistence How long it takes a substance to break down in the environment This statistic can be either high or low Solubility Ability to dissolve in liquid particularly water Fatsoluble or Watersoluble Bioaccumulation The build up of fat soluble substances in the tissue of an organism over the course of it s lifetime Biomagnification Consequence of bioaccumulation occurs when animals that are higher up on the food chain eat animals that have bioaccumulated toxins Toxicology Determining properties of toxins and their effects on cells and tissues 0ften tested on animals which is called in vivo in bodyquot Testing cells in Petri dishes is called in vitro in glassquot Epidemiological studies Studies that analyze human population to see if patterns emerge in particular groups Chemical Interactions Additive Effect If exposure to the two chemicals If exposure to both chemicals actually gives the effect that is expected lessens the effect that is expected then the 2 2 4 then the effect is additive interaction is antagonistic If exposure to both produces an effect much grater than the sum of the two individual effects the chemicals are working synergistically Dose Response Curve LD50 Lethal Dose at which 50 of the population would die