PSL201Y1 Final: classifications of hormones

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plummammoth203

8 Mar 2011

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Lecture three: classification of hormones ((peptide/protein = 3+ aas, steroid = cholesterol, amine hormones = single aa) their properties are based largely on their composition. S pre-pro-insulin in the er, released: most hormones, most common, water soluble, dissolved in plasma = into golgi. S released from the golgi as pro- insulin after modification. S cleaved to form active insulin and non-active c-peptide. C-peptide are released into the bloodstream in a 1:1 fashion. S cholesterol is modified by enzymes: water insoluble bound to carriers in the to make steroid hormones. S adrenal cortex = aldosterone, blood long half life (compared to peptide hormones: has cytoplasm/nucleus receptors because it can move among cells, because receptors are at nucleus, can regulate gene expression. Hormone peptide hormone steroid hormone synthesized like proteins. Preprohormone mrna sequence is transcribed with an er signal sequence. Ribosomes translate the prohormone and in the er it undergoes modifications.

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what are the thermodynamic specifications for the materialcomponents of a heat pack. what is the process used to generateheat â the chemical/material process and describe the use ofmaterial selection in relation to its appropriateness for usewithin a pocket warmer.

Discussion as to the enthalpy changes upon âactivatingâ the warmer.Details of the amount of energy released and brief comparison withother systems/justification for selecting your material andcovering. How much material is required, the energy output from it(Enthalpy of hydration etc) and the temperature increase expected(taking in account heat capacity of the material components) fromthe process involved (remember to factor into the calculations âthe actual amount of material being used).

You are given a circular conducting wire loop with one
end cut out and connected to a resistor, R, as shown in
the figure to the right. A metal rod of length l is set at an
initial angle ?0 from the resistor, and then rotates
clockwise about the center of the wire loop with angular
frequency through a uniform magnetic field B
directed into the page. The metal rod stays in contact
with the wire loop at all points of its motion. Unless
otherwise requested, all answers should be in simplified
algebraic form using the above given variables.

(a) Given that the initial angle ?0 is in radians, what is theinitial area of the closed circuit âwedgeâdefined by ?0? (2pts.)
(b) What is the magnetic flux through this initial âwedgeâ areadefined by ?0? (2 pts.)
Starting at time t=0 at position ?0, the rod is rotated clockwisewith angular velocity as shown in
the figure. Given this configuration, answer questions (c)-(g)below:
(c) What is the direction of the induced magnetic field inside theâwedgeâ? (2 pts)
(d) What is the direction of the induced current around the closedcircuit? (2 pts)
(e) What is the magnitude of the induced emf, E in the circuit? (4pts)
(f) What is the magnitude of the induced current in the circuit? (4pts)
(g) What is the power used by the resistor? (4 pts)
(h) The metal rod is now rotated in the opposite direction, i.e. inthe counter-clockwise direction. Given this information, completethe chart below as to what quantities you just calculated change,and what ones do not change. You do not have to show work, justgive the result. No partial credit will be given here. (5pts)

Direction of induced magnetic field inside the âwedgeâ.
Direction of the induced current around the closed circuit.
Magnitude of the induced emf, E in the circuit.
Magnitude of the induced current in the circuit.
Power used by the resistor.

The setup is now modified slightly so that the circular conductingwire loop no longer has a small
section removed as shown in both figures below. This modificationwould allow the metal rod to
continuously rotate on the circular wire loop as clearlyillustrated in the 3D side view. The metal rod
is rotated clockwise, as in the initial part of the problem.

(i) Given this information, complete the chart below. You do nothave to show work, just give the
result. No partial credit will be given here. (5 pts)

Direction of induced magnetic
field inside the âwedgeâ.
Direction of the induced current
around the closed circuit.
Magnitude of the induced emf, E in
the circuit.
Magnitude of the induced current
in the circuit.
Power used by the resistor.

PSL201Y1 Final: classifications of hormones

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