Recent content by nokia8650

If one has the mean and standard deviation of a population, is it possible to calculate (or estimate) the mean and standard deviation of the inverse population (ie. 1/(every value in the original population)? Thank you!

Ahh yes I see, thank you! However, does 20dB not correspond to a factor of 10, and 40dB to a factor of 100, given the fact it is dB SPL, and hence 20logx as opposed to 10logx? Also, the next part of the question asks - if the sound pressure of D is four times that of E, by how many decibels do...

1. What is the total sound pressure levels of two identical tones, each 88db SPL, when added together? For this question, using the equation dB SPL = 20log(P/2*10^-5), I found the value of P where dB SPL = 88, then doubled this value, then fed it back into the equation, to obtain a value of...

Thanks for the reply. If 40mV was the total battery voltage, and there are 40mV across the capacitor, does that mean that there are 0v across the resistor? My physics is really rusty ever since I became a medic..!

See file below: http://img228.imageshack.us/img228/5797/screenshot20100527at215.png This is for a biological membrane, but the principles are the same. I am asked what the value of the initial voltage, Vt is.The options are: What was the value of the initial voltage, Vt? A. +58 mV B. -58 mV...

I was wondering what the changes would be if the a) the lung compliance decreased and b) the chest wall compliance decreased. Am i correct in thinking both would result in a fall in FRC, or would that only be for a fall in lung compliance? In addition, what would happen to other lung volumes...

ah okay; i see it now. Thanks so much. Yes, there was an accompanying chest radiograph which showed the gas clearly, but i couldn't see it in the abdomen which is why i only asked about this image. Thanks you!

Hmm I see your point. I made sure no identifiers etc were present but I guess i won't do it again! I see the inferior margin of the liver, but I am still unsure of where the falciform ligament is;is it the line which is crossing from the right over to the left in the midline at the top of the...

Yes, I am a first year medical student. No, I would certainly not be hacking patients records or anything! The url is for "image shack", a popular image hosting website. Hmm yes I know the falciform ligament is the ligament attached the liver to the anterior abdominal wall and the diaphragm...

It was amongst a number of radiographs accessible to us online for those at our college.

I was struggling with the radiograph below;I am told that "the plain abdominal X-Ray shows the falciform ligament outlined by gas. This is the appearance of extraluminal gas." http://img687.imageshack.us/img687/1634/c03axrperf.jpg However I am unable to see this; is it possible for...

thanks for the reply! I can't really think of anything... would it be possible for you to nudge me in the right direction? Thanks

I was struggling with interpreting the following pedigree diagram: http://img245.imageshack.us/img245/715/photoon20100411at2211.jpg I can see from the diagram that only females seem to be capable of transmitting the disease - not males - this lead me to believe it is X-linked. In...

i was undertaking a question regarding a patient who had a mutation in their mitochondria, and hence experienced lethargy. A subsequent test of his mitochondria found his mitochondria to have an increased state 4 respiration, but a normal state 3 respiration. In order to explain this, I would...

I started to reply about how i still didnt understand, but then as I tried explaining why I saw the reason! Although the polymerase may go beyond the region of interest, on the next cycle, the primer will only bind to the start of the region of interest, and so after a few cycles, youll be left...