07_thermodynamics_S11a (2)

07_thermodynamics_S11a (2) - Physics 105 ! Spring 2011!...

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1 Physics 105 Physics for Decision Makers: The Global Energy Crisis Lecture 7 Jordan Goodman Spring 2011 Physics 105 – Spring 2011 Genetically Modifed Fish ! The FDA is considering whether to approve genetically modifed fsh for human consumption. ! This would allow fsh spawned From genetically engineered salmon eggs to be allowed for use as food. These "AquAdvantage ® Salmon" grow into Full-sized fsh in halF the time that it would take a regular salmon. ! They combine a growth gene from the Pacifc Chinook salmon and genetic material from the ocean pout - a large, eel-like fsh - into the fertilized eggs of Atlantic salmon, making the recombined DNA present in cells throughout the body oF the fsh. ! The Chinook gene promotes the growth to market size, and the pout gene allows the fsh to grow in the winter as well as the summer. Page 2
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2 Physics 105 – Spring 2011 ! The company claims the resultant fsh are reproductively sterile due to another genetic alteration - triploidy - that eliminates the possibility of interbreeding amongst themselves or with other native breeds, while maintaining protection over intellectual property. ! The company will only sell Female eggs and raise the fsh within contained, inland systems. However, despite these assurances, the FDA indicates that up to 5% of the eggs may indeed be fertile, and the company's claims in this regard are "potentially misleading." Page 3 Physics 105 – Spring 2011 Would you eat genetically modifed salmon? 1. In a heartbeat 2. If the FDA approves it, I guess it's okay 3. I'll wait a while and see how people fare 4. In a pinch 5. Not on your life Page 4
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3 Physics 105 – Spring 2011 CNN poll results Page 5 Physics 105 – Spring 2011 Page 6
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4 Physics 105 – Spring 2011 Page 7 Physics 105 – Spring 2011 Should we be doing this genetic engineering? 1. Yes 2. No 3. Only under very controlled circumstances Page 8
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Physics 105 – Spring 2011 Electric Potential ! To move electric charge against an electric force requires work. - V ! W/Q ! The electric potential energy difference between two points is the work per Coulomb to move charge between the points and in measured in volts where 1 volt = 1 joule/coulomb 1.5v + - e- Physics 105 – Spring 2011 Basic Circuits ! Current direction is from positive to negative voltages ! Current (I) is the rate charge flows - I = " Q/ " t ! Current is measured in AMPERES (AMPS, A ) - 1 amp = 1 coulomb / s ! Resistance is anything that causes an opposition to the flow of electricity in a circuit. ! Resistance
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This note was uploaded on 02/28/2011 for the course PHYS 105 taught by Professor Staff during the Spring '08 term at Maryland.

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07_thermodynamics_S11a (2) - Physics 105 ! Spring 2011!...

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