a) Normal Distribution
b) Binomial Distribution
c) Uniform Distribution
d) Poisson Distribution
Answer : (D)
For some brief notes ----> Poisson Distribution
Thursday, February 12, 2009
AIIMS MAY 2008 SPM
q.42 What is the best distribution to study the daily admission of head injury patients in a trauma care centre?
Friday, February 6, 2009
AIIMS May 2008 Physiology Question
Phosphatidyl choline in a lipid monolayer, at pH of 3.5 leads to ?
a) Decreased surface potential
b) Increased Surface potential
c) Decreased Dipole moment
d) Zero Dipole moment.
Answer : ? B
This article I found might throw some light.
"Solution pH Alters Mechanical and Electrical Properties of Phosphatidylcholine Membranes: Relation between Interfacial Electrostatics, Intramembrane Potential, and Bending Elasticity"
a) Decreased surface potential
b) Increased Surface potential
c) Decreased Dipole moment
d) Zero Dipole moment.
Answer : ? B
This article I found might throw some light.
"Solution pH Alters Mechanical and Electrical Properties of Phosphatidylcholine Membranes: Relation between Interfacial Electrostatics, Intramembrane Potential, and Bending Elasticity"
Biophys J. 2007 April 1; 92(7): 2451–2462.
Published online 2006 December 15. doi: 10.1529/biophysj.106.096362.
Yong Zhou and Robert M. Raphael
"the membrane dipole potential increases as solution pH decreases"
which should rule out the last two options.
Now read this ---------
"At pH 2 and 3, SOPC vesicles have a positive ζ-potential, indicating extensive association of protons at the membrane surface. This agrees with other investigations demonstrating that phospholipids carry a positive ζ-potential at low pHs . At pH 4, the ζ-potential is nearly zero (∼3.5 mV) and the LUVs showed low mobility, in agreement with other investigations demonstrating that the isoelectric point of PC lipids is ∼pH 4 . At the near neutral pH of 6.5, the ζ-potential is clearly negative (∼−21 mV), in agreement with many investigations which have pointed out that PC is negatively charged between −10 mV and −30 mV at neutral pH"
-------------------
Therefore the answer might be (B). Increased Surface Potential
Yong Zhou and Robert M. Raphael
"the membrane dipole potential increases as solution pH decreases"
which should rule out the last two options.
Now read this ---------
"At pH 2 and 3, SOPC vesicles have a positive ζ-potential, indicating extensive association of protons at the membrane surface. This agrees with other investigations demonstrating that phospholipids carry a positive ζ-potential at low pHs . At pH 4, the ζ-potential is nearly zero (∼3.5 mV) and the LUVs showed low mobility, in agreement with other investigations demonstrating that the isoelectric point of PC lipids is ∼pH 4 . At the near neutral pH of 6.5, the ζ-potential is clearly negative (∼−21 mV), in agreement with many investigations which have pointed out that PC is negatively charged between −10 mV and −30 mV at neutral pH"
-------------------
Therefore the answer might be (B). Increased Surface Potential
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