What is Response: Definition and 538 Discussions

The dose–response relationship, or exposure–response relationship, describes the magnitude of the response of an organism, as a function of exposure (or doses) to a stimulus or stressor (usually a chemical) after a certain exposure time. Dose–response relationships can be described by dose–response curves. This is explained further in the following sections. A stimulus response function or stimulus response curve is defined more broadly as the response from any type of stimulus, not limited to chemicals.

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  1. M

    Renal Response to Hydrated Exercise?

    I am doing a first year physiology course and during my studies i have found that the textbook displays very little about renal response to exercise. During a lab experiment, we measured osmolarity and urine amount of a period of 5 20 minute increments after approximately 600ml of water and...
  2. D

    Help with frequency response of guitar tone circuit

    The circuit of interest is the basic circuit for a Fender Stratocaster guitar. A diagram can be found at http://www.seymourduncan.com/support/schematics/S_1singlecoil_1vol_1tone.html . Basically an electric guitar works by vibrating a metal string in a magnetic field. This in turn causes a...
  3. J

    How Does a Linear System Respond to a Sine Wave Input Using Fourier Transform?

    Find the response of the of the linear system at rest y' + y = x , where x = sin(t) using the Fourier transform and formulas : Y(jw)=H(jw)X(jw) y(t)=h(t)*x(t) convolution
  4. D

    Determining Frequency Response Using Nodal Analysis

    I am trying to find the frequency response for the given circuit. My instructor recomended using a nodal analysis method. However, while attempting to use the nodal analysis I end up with all my variables equaling zero (Va = 0, Vin = 0 and Vout = 0). Is there something I'm missing or over...
  5. N

    Free Response AP Stats: Statistics and Probability

    statistics and probability
  6. D

    Far out free response concerning motion

    Hello everyone, I have yet another problem that I just can't seem to work my way around. Here it is: A particle starts from rest and at the origin. The particle is cofined to motion along a straight line. The particle accelerates uniformly with magnitude a for a time interval t, then...
  7. C

    Impulse Matching: Finding the Unit Impulse Response

    Impulse Matching In regards to finding the unit impulse response of a system. We assume that x(t) = \delta (t) and that the intials conditions at t=0^_ are all zero. The impulse response h(t) therefore must consists of the systems's modes for when t \geq 0^+. But why is it that h(t) = A...
  8. cronxeh

    Witnessing a Crash: A Story of Imminent Danger and Heroic Response

    Well I was on my way to the state written EMT-B exam, sitting on the bus station when at around 6:35 pm EST I spot a black Honda going from the left, and a white van coming from adjacent road. My brain was punching all the numbers and estimated an imminent collision, which took place in about 3...
  9. Y

    How Do You Find the Impulse Response h(t) for a Differential Equation System?

    can someone show me how to find the impulse response h(t)? questions: Determine the impulse response h(t) for the system characterized by the differential equation y(2)(t) + 2 y(1)(t) + 17 y(t) = x(2)(t) + 5 x(1)(t) + 18 x(t) thanks
  10. marcus

    An Australian response to Intelligent Design

    http://www.theage.com.au/news/national/kosky-rules-intelligent-design-a-faith/2005/10/28/1130400365346.html October 29, 2005 ---quote--- Kosky rules intelligent design a faith Victoria's government schools will treat intelligent design as a religious faith, not science, Education Minister...
  11. R

    Frequency Response of h(n) - (a)^n*cos(n*pi)*u(n)

    Can you help me find frequency response for the system. Thanks h(n) = (a)^n*cos(n*pi)*u(n)
  12. M

    Response of System to sin(3t) and tri(t-1) Inputs

    The question is as follows: The step response of a linear time-invariant system is given as s(t)=t*e^(-2t) u(t) Determine the response of the system to the following inputs: a. x(t)=sin(3t) u(t) b. x(t)=tri(t-1) As of now I see this problem and I have no idea what it means...I tried...
  13. M

    News Iran Resumes Uranium Conversion: US Response?

    I just read that Iran is resuming their uranium conversion. http://www.cnn.com/2005/WORLD/meast/08/08/iran.nuclear/index.html Since this is not uranium enrichment, it's no big deal, right? Do you suppose United States and/or other countries go crying to the UN?
  14. B

    Plotting output response of system ot the input stimulus given

    Hi I need to "plot the output response of the system shown to the input stimulus given" I suppose it would help if i knew where to start, but I'll try and explain as best I can. There are two drawings. Drawing 1 - shows a rectangle with 1 / 1 +0.5s inside and a line drawn...
  15. E

    Why Am I Struggling with English Despite Excelling in Other Subjects?

    Iam doing very very poorly in English, while all my other courses math, chemistry, biology etc. are like 90%'s. I don't know what to do, I asked help from lots of people with this, and I still can't get do this well enough. I don't even know how I past the grad 10 literacy test. Heres my...
  16. A

    Solving natural/step response in RL/C circuits

    when solving a RL or RC circuit, what's the easiest way to tell if it is a natural response problem or step response?
  17. C

    Why Donor Blood O Doesn't Stimulate an Immune Response in Recipient A

    If we give someone with blood group A a transfusion using an O doner we say they are safe, since the O blood cells will not possesses antigens to stimulate an immune response in the recipient. But surely the O doner blood with contain anti-A antibodies and memory cells that will be stimulated...
  18. C

    Why is the secondary immune response more efficient than the primary response?

    Why is the secondary immune response so much faster and so much greater than the primary immune response to a pathogen? Thanks in advance. :smile:
  19. S

    Electron Clouds: Perpetual Motion? Response

    Perhaps motion is not what is happening in the electron clouds, at least not the motion we sense from the coordinates at which we observe the universe. Remember that you and I are particulate beings, made of what we observe to be atoms and particles...as you say? Also remember that each...
  20. H

    AP Statistics 2002 Free Response Questions

    http://www.collegeboard.com/prod_downloads/ap/students/statistics/statistics_frq_02.pdf #3, please
  21. S

    3 free response practice AP problems

    Hi everyone. I need some help with these 3 problems. Any help would be appreciated. 4. Let f be the function defined by f(x)= ln(2+ sin x) for pi <= x <= 2pi (a) Find the absolute maximum value and the absolute minimum value of f. Show your analysis that leads to your conclusion...
  22. A

    Schools Waiting for the response of McGill university

    i just received today my acceptance from the university of Virginia Tech in virginia, USA. I have until the first of may to send back the form to get the ultimate confirmation and to finalyze my application On the other hand, I'm waiting for the response of McGill university (Montreal, Quebec...
  23. C

    Frequency Response of Amplifiers (BJT and FET transistors)

    Hi, I have a question pertianing to the effect of capacitance of BJT amplifier circuits on the low and high frequency response of the amplifier. Why is it that the coupling and the decoupling capacitors, in effect, only affects the low frequency response of the amplifier, and why is it...
  24. Ivan Seeking

    Scott Stevens' Response on Meteorologist Scalar Clouds

    From the thread: https://www.physicsforums.com/showthread.php?t=61472 Well Dayle, I emailed Scott Stevens http://www.kpvi.com/index.cfm?page=team/scot/content.cfm and asked about the claims at your linked site. Here is his response. I didn't think that it would take long to nip this in the...
  25. B

    What is the best way to get a response?

    To those who habitually use this forum: What are the best methods to get a response to a question? I really love the idea behind these forums, but I never seem to evoke reactions with my threads. Is it all in the title, or is it how I post my question? I guess mine was just one of many wave...
  26. T

    Understanding Two Point Collision Response in Rigid Bodies

    Hello, I am attempting to determine a two point collision response for a rigid body. One point collision I can calculate, but I can't seem to extend it to two points. So, I thought, maybe I could get some insight here. :) Set up (It'd be great to have the ability to draw this one...
  27. D

    2002 ap physics c free response #1 question

    hello, in lieu of the upcoming ap exam, I have been studying old free response questions from ap exams. I have a question about this one A crash test car of mass 1000kg moving at constant speed of 12m/s collides completely inelastically with an object of mass M at time t=0. the object was...
  28. L

    Impulse response and convolution? any help from anyone?

    hey, i did my undergrad in music and english and now am lost beyond reckoning with the impulse response stuff in my postgrad. Could anyone help with these exercises? They're examples from my lecture notes and have no idea how my lecturer got the answers. Please help? Ex.1) Show that x(t)*h(t)...
  29. L

    Impulse response? I need a bit of help with this if anyone can?

    hey, i did my undergrad in music and english and now am lost beyond reckoning with the impulse response stuff in my postgrad. Could anyone help with these exercises? They're examples from my lecture notes and have no idea how my lecturer got the answers. Please help? Ex.1) Show that x(t)*h(t)...
  30. L

    Help with impulse response and convolution?

    hey, i did my undergrad in music and english and now am lost beyond reckoning with the impulse response stuff in my postgrad. Could anyone help with these exercises? They're examples from my lecture notes and have no idea how my lecturer got the answers. Please help? Ex.1) Show that...
  31. M

    News In Response to the War Crimes caught on video Thread

    You know, Adam posted a video that showed Americans shooting a wounded iraqi next to his gun while cheering... Well I saw it again on CNN late last night but I got quite a different interpretation. The feature was about how many young soldiers have to live with killing, and how it affects them...
  32. R

    Enhancers and response elements

    What is the difference exactly? Thanks!
  33. S

    Free Response: Skier moving down a slope

    19) An Olympic skier moving at 20m/s down a 30degree slope encounters a region of wet snow, of coefficient of friction, .74 a. How far down the slope does he go before stopping? I know the answer is 144m, but how do I get there? b. How much mechanical energy is lost in this process...
  34. Monique

    Difference T helper 1 vs 2 immune response

    I am getting a hold on immunological responses at the moment, but I am not familiar yet with the difference between T helper 1 and T helper 2 (Th1, Th2) immune response. I know that: Th1 cells produce IL-2 and IFN-gamma, which activate CD8+ T cells, NK cells, and macrophages; whereas Th2...
  35. D

    How do I solve an AP chem free response on ammonia and light interactions?

    [SOLVED] an AP chem free response (please help!) i have a final tomorrow (yea i was procrasinating) and i have to figure out how to do these practice problems! please help you can! i need to know how to do it ASAP! NH3(aq) + H20(l) <---> NH4+(aq) + OH-(aq) In aqueous solution, ammonia...
  36. S

    Our Body and EM Waves: Explaining the Response

    why do our body don't feel the EM waves.
  37. M

    Response to Mentat: what I believe to be a &quot;paradox&quot;

    [SOLVED] Response to Mentat: what I believe to be a &quot;paradox&quot; By paradox I mean as the paradoxes associated with quantum mechanics. Whatever drives the nature of things, the physical laws has to be an "ultimate" force. That is it cannot fail. Nothing "owns" this force and it can...
  38. N

    Collision response between two objects

    Hello users, I'm working on a game at the moment which needs some physics. I try to simulate two objects at the moment that are colliding in the air. I know the mass of both objects, the mass center point, the collision point, their current rotation and their current speed etc, all I need ( I...
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