a three generation study with genetically modified bt corn in rats: biochemical and...
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A Three Generation Study A Three Generation Study with Genetically Modified with Genetically Modified
Bt Corn inBt Corn inRats: Biochemical and Rats: Biochemical and
Histopathological Histopathological InvestigationInvestigation
Dina GhannamDina GhannamBiology Department Biology Department Salem State CollegeSalem State College
What this study is about
• Investigation of health risks using GM crops (Bt corn) in rats
• Genetically modified food (GM): – What is GM food?– Advantages – Disadvantages
• Bt corn
Bacillus thuringiensis
http://bacillusthuringiensis.pbwiki.com/f/Bacillus%20Thuringiensis.jpg
http://www.bio.davidson.edu/people/kabernd/seminar/2004/GMevents/LH/LH.html
Materials and Methods
• Rats– Age, gender, generations, housing and
environment.
• Groups– group I, group II, group III.
• Diets– Standard, reference, and transgenic
Groups and diets
Transgenic corn (Bt)
Reference corn
Standard diet
Group I ----------- ------------ 100%
Group II ---------- 20% 80%
Group III 20% ----------- 80%
ExaminationGeneral observation Fertility, off springs and weight
Histopathology Tissue samples, microscope, glomeruli
from kidney, and liver
Biochemical Blood sample, serum analysis (urea,
nitrogen, uric acid, etc.)
Results
• General result – Fertility– Body weight – Organ weights
• Histopathology (Group III)– Stomach: normal– Liver and kidney
Photomicrographs of liver and kidney
Liver A-C, kidney D-F.
Blood Serum Results
• Significant change of:• Creatinine, gllobulin and albumin
• Groups and genders
• Urea uric acid
Conclusion • GM food is both beneficial and harmful at the same time.• Using Bt corn did not have any adverse effects.
• Many (minor) changes happened at the tissue level and body fluid level
• Short term study is not enough. A long term study is strongly suggested using other kinds of animals.
• Because of FDA approval of GM food, considered relatively safe
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