Kermit to Kermette?
1. Does atrazine appear to alter male frog development at any concentration?
Yes the atrazine appears to alter male frogs at ONE PP Liter
2. If atrazine does affect male frog development, what is the lowest concentration and dose that appears to
have the effect?
-The lowest concentration in which this has effect is in .05
3.The chemical DDT was banned for use in the U.S. in the 1960s. For years afterwards, however, American
manufacturers of DDT continued to export it to third world countries that had not yet banned its use. How
does this observation relate to the use of atrazine in the U.S. today?
-The same way in which we banned it many other countries banned the atranize and because other countries they still see the pathway open to sell it.
Part 2
1. A Syngenta press release quotes James Carr, head of the Texas Tech team, as saying, “We have been unable
to reproduce the low-concentration eff ects of atrazine on amphibians reported elsewhere in the scientifi c literature.” " is statement refers to Hayes’ results (Hayes,2002,2003). Comment on the accuracy of this
statement, and explain your reasoning.
-It is not very accurate because they don't exactly know that the atranize is what assume it their could be other things contributing to it
2. The Hayes study (Hayes, 2003) was conducted using water samples collected from ponds and streams
in agricultural and non-agricultural regions of the Midwest. " e study conducted by Carr’s group added
varying amounts of atrazine to de-chlorinated laboratory water. Which set of experimental conditions, if
either, would be more likely to lead to valid experimental results? Explain your reasoning.
-They dont know what other things are in the water so in my opinion i believe that they could of just know what other chemicals or things are in the water, i think that will benefit because just assuming that the atranize is the main contributor to the problem they wont get anywhere
3. Comment on the significance of the Carr data, shown above, that reports the percent of male frogs having
gonadal abnormalities at a nominal atrazine concentration of zero micrograms per liter and a nominal dose
of zero micrograms per liter
-This is random mutation.. Their might also be other contributors to the problem or the frogs could of been exposed to it much longer.
Part 3
1. What do the Hayes results indicate about the effect of atrazine on the testosterone concentration in the
blood of exposed male frogs?
-The data shows that not a large concentration of atranize will affect the male frogs, those who are exposed to it.
2. What do the results indicate about the effect of atrazine on the testosterone concentration in the blood
of exposed male frogs?
-The MSU results show the same effect that it had on Hayes experiment. Except that Hayes control males did have high concentrations.
3. Consider the ’s observation about the presence of atrazine in the controls used in the study. Could
this observation explain how Hayes and Hecker could both have accurately reported their experimental
observations?
-I think that the EPA's observation does not explain the results form the other labs because the numbers are very different and in random places does the atrnize have no effect.
4. In , the recommended that Syngenta’s license to continue the use of atrazine in the United States
be approved. If one assumes that the data presented here are valid, what factor or combination of factors
might have led to this recommendation?
-The collection of data that had cause this to be recommended I think would be Hayes data. I think that Hayes data because at every point would the male frogs change.
5. Search for two web sites that support the continued use of atrazine and two web sites opposed to its
continued use. Prepare an assessment of the validity of these web sites and be prepared to share your
observations in class. Useful guidelines for the evaluation of the credibility of web postings may be found at
the following : http://www.virtualchase.com/quality/checklist_print.html.
Yes the atrazine appears to alter male frogs at ONE PP Liter
2. If atrazine does affect male frog development, what is the lowest concentration and dose that appears to
have the effect?
-The lowest concentration in which this has effect is in .05
3.The chemical DDT was banned for use in the U.S. in the 1960s. For years afterwards, however, American
manufacturers of DDT continued to export it to third world countries that had not yet banned its use. How
does this observation relate to the use of atrazine in the U.S. today?
-The same way in which we banned it many other countries banned the atranize and because other countries they still see the pathway open to sell it.
Part 2
1. A Syngenta press release quotes James Carr, head of the Texas Tech team, as saying, “We have been unable
to reproduce the low-concentration eff ects of atrazine on amphibians reported elsewhere in the scientifi c literature.” " is statement refers to Hayes’ results (Hayes,2002,2003). Comment on the accuracy of this
statement, and explain your reasoning.
-It is not very accurate because they don't exactly know that the atranize is what assume it their could be other things contributing to it
2. The Hayes study (Hayes, 2003) was conducted using water samples collected from ponds and streams
in agricultural and non-agricultural regions of the Midwest. " e study conducted by Carr’s group added
varying amounts of atrazine to de-chlorinated laboratory water. Which set of experimental conditions, if
either, would be more likely to lead to valid experimental results? Explain your reasoning.
-They dont know what other things are in the water so in my opinion i believe that they could of just know what other chemicals or things are in the water, i think that will benefit because just assuming that the atranize is the main contributor to the problem they wont get anywhere
3. Comment on the significance of the Carr data, shown above, that reports the percent of male frogs having
gonadal abnormalities at a nominal atrazine concentration of zero micrograms per liter and a nominal dose
of zero micrograms per liter
-This is random mutation.. Their might also be other contributors to the problem or the frogs could of been exposed to it much longer.
Part 3
1. What do the Hayes results indicate about the effect of atrazine on the testosterone concentration in the
blood of exposed male frogs?
-The data shows that not a large concentration of atranize will affect the male frogs, those who are exposed to it.
2. What do the results indicate about the effect of atrazine on the testosterone concentration in the blood
of exposed male frogs?
-The MSU results show the same effect that it had on Hayes experiment. Except that Hayes control males did have high concentrations.
3. Consider the ’s observation about the presence of atrazine in the controls used in the study. Could
this observation explain how Hayes and Hecker could both have accurately reported their experimental
observations?
-I think that the EPA's observation does not explain the results form the other labs because the numbers are very different and in random places does the atrnize have no effect.
4. In , the recommended that Syngenta’s license to continue the use of atrazine in the United States
be approved. If one assumes that the data presented here are valid, what factor or combination of factors
might have led to this recommendation?
-The collection of data that had cause this to be recommended I think would be Hayes data. I think that Hayes data because at every point would the male frogs change.
5. Search for two web sites that support the continued use of atrazine and two web sites opposed to its
continued use. Prepare an assessment of the validity of these web sites and be prepared to share your
observations in class. Useful guidelines for the evaluation of the credibility of web postings may be found at
the following : http://www.virtualchase.com/quality/checklist_print.html.
FOR
-Important role in Agriculture -Supports 85,000 jobs - increases U.S. corn crop yields by about 7 bushels per acre -cause less erosion in the soil -Controls weeds -http://www.atrazine.com/Benefits/atrazine_benefits.aspx |
AGAINST
-"cancer cause" -affects aquatic life -changes frogs sexes -http://www.epa.gov/oppsrrd1/reregistration/atrazine/atrazine_update.htm |