PHL283H5 Lecture Notes - United States Public Health Service, Clinical Trial, Syphilis

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viridiancockroach622

25 Oct 2011

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Document Summary

Azt trials background is the world aids pandemic. What was done: 16 trials in 11 countries, burkina faso, dominican republic, ethiopia o. Angels: double standard this is about as problematic as you can get when it comes to clinical research comparable to syphilis believes we have enough information for the historical studies, placebo controlled trials are unethical. May not be able to receive legitimate informed consent. Understanding can fail - differentiate between medical treatment and medical research - the risks and benefits. In a situation where there is no treatment - raise worries about the voluntary- ness of your participants: coercion. Brody: a threat to put someone below their baseline unless they co-operate with the demands of the person issuing the treat. Making someone worse off unless they listen. Different ways of understanding someone"s baseline - coercion involves making someone worse off than if the treat was never administered - factual/empirical view.

Related Questions

1)how is the polarization of an electromagnetic wave defined?

a.none of these choices.

b. the polarization is defined by the plane in which the magnetic field is oscillating.

c. the polarization is defined by the direction the wave is traveling.

d. the polarization is defined by the plane in which the electric field is oscillating.

2)In this lab you will be given two polaroid sheets with unlabeled transmission axes. How can you tell, when looking through both polaroid sheets at the same time, if the transmission axes are crossed?

a.If the transmission axes are crossed, you will see one bright line when you look through the polaroid sheets.

b.If the transmission axes are crossed, it will be bright when you look through the polaroid sheets.

c.If the transmission axes are crossed, you will see a bright "+" shape when you look through the polaroid sheets.

d.If the transmission axes are crossed, it will be very dark when you look through the polaroid sheets.

3)In the polarizer + analyzer experiment you will want to start with the transmission axes of the polarizer and the analyzer aligned. How will you know when the transmission axes are aligned?

a.The reading on the detector will be a maximum.

b.The reading on the detector will be a minimum.

c.The 0 degrees reading on the analyzer will be pointing up.

4)Suppose you are wearing polarized sunglasses and looking at a lake on a bright, sunny day. What will happen if you rotate your polarized sunglasses by 90 degrees?

a.The lake will appear equally bright as before you rotated your sunglasses.

b.The lake will appear significantly brighter.

c.The lake will appear significantly darker.

5)Suppose you are looking at unpolarized light coming from an incandescent light bulb. How much will the light intensity you observe be reduced if you look through a single polarizer?

a.50%

b.75%

c.100%

d.25%

peachgrasshopper627

Suppose we have reason to suspect that a certain quantum objecthasonly three quantum states. When we excite a collection ofsuchobjects we observe that they emit electromagnetic radiationofthree different energies: 0.9 eV (infrared), 1.9 eV (visible),and 2.8 eV (visible).

(a) Draw a possible energy-level diagram for one of thequantumobjects, which has three bound states. On the diagram,indicate thetransitions corresponding to the emitted photons, andcheck thatthe possible transitions produce the observed photons andnoothers. When you are sure that your energy-level diagramisconsistent with the observed photon energies, enter the energiesofeach level (K+U, which is negative). EnterALLlevels before submitting; all of the energies must be correctto beproperly scored. The energy K+U of theground state is -4eV.