Search found 13 matches

by udi
Mon Jul 03, 2006 12:17 pm
Forum: Adding new mechanisms and functions to NEURON
Topic: voltage and calcium dependent channel
Replies: 7
Views: 6575

ted wrote: I wasn't asking what happened to z. The point of my question was to find
out how your model behaves when A is 0.
In this case (A = 0) it behaves like the mechanism (I_m) is NOT calcium dependent: increasing gbar hyperpolarizes the cell, decreasing gbar depolarizes the cell.
by udi
Mon Jul 03, 2006 10:11 am
Forum: Adding new mechanisms and functions to NEURON
Topic: voltage and calcium dependent channel
Replies: 7
Views: 6575

Are you saying that increasing this mechanism's gbar hyperpolarized the cell when this mechanism was not Ca dependent, but depolarized it after you made it Ca dependent? Yes I am... If so, what happens when you reduce A to 0? In this case, z=1, as it was when the mecahnism wasn't Ca dependent. But ...
by udi
Sun Jul 02, 2006 1:07 pm
Forum: Adding new mechanisms and functions to NEURON
Topic: voltage and calcium dependent channel
Replies: 7
Views: 6575

Thanks for your answer. I did as you said and here is the related parts from the mod file: -------------------------------------------------------------------- NEURON { USEION k READ ek WRITE ik USEION ca READ cai } PARAMETER { cai (mM) IC50 = 0.0001004 (mM) A = .868 n = 1.03 frc = 1 ikk } BREAKPOIN...
by udi
Thu Jun 15, 2006 4:31 am
Forum: Adding new mechanisms and functions to NEURON
Topic: voltage and calcium dependent channel
Replies: 7
Views: 6575

voltage and calcium dependent channel

Hi, I want to describe a voltage dependent channels (e.g KDr, KM) as voltage AND calcium dependent in a way that calcium INHIBITS the channel. The "degree" of inhibition is defined according to the following function: y = A * ((cai*X))/ (((cai*X)) + (Z)) ; A,Z,X are defined elsewhere). wha...
by udi
Mon May 08, 2006 11:08 am
Forum: Other questions
Topic: "bad stack access"
Replies: 1
Views: 4886

"bad stack access"

hi all, I'm using the following code: objref vvec, tvec ,vx, i1, i2 vvec = new Vector() tvec = new Vector() tvec.record(&t) soma vvec.record(&v(0.5),tvec) i1 = tvec.indvwhere(">=", t1) //t1, t2 are defined elsewhere i2 = tvec.indvwhere("<=", t2) vx = vvec.c(i1+1, i2) When...
by udi
Mon Dec 26, 2005 5:24 am
Forum: MSWin
Topic: CPU usage while running a simulation
Replies: 10
Views: 14799

Thanks for the answer. I'll take into consideration the last offer ...
by udi
Thu Dec 22, 2005 9:10 am
Forum: MSWin
Topic: CPU usage while running a simulation
Replies: 10
Views: 14799

CPU usage while running a simulation

Hi, I'm using NEUON under winXP on a pentium 4 computer, cpu 4 GHz, RAM 2 GB. When I run simulation (of a single neuron) without any other program running in the background I see that the CPU usage is almost 100%. Should I increase the CPU speed in order to get 'faster' results? Thanks in advance, -...
by udi
Tue Dec 06, 2005 3:00 am
Forum: The GUI
Topic: saving *.ps files
Replies: 6
Views: 11704

thanks.

--Udi.
by udi
Mon Dec 05, 2005 1:25 pm
Forum: The GUI
Topic: saving *.ps files
Replies: 6
Views: 11704

still does not work...
by udi
Sun Dec 04, 2005 3:20 pm
Forum: The GUI
Topic: saving *.ps files
Replies: 6
Views: 11704

Thanks for the quick response.

Regarding the *.ps -
I work under winXP, NEURON version 5.7. I could not find the line in the nrn.def file.

about the idraw, it works.

thanks again.
by udi
Sun Dec 04, 2005 11:34 am
Forum: The GUI
Topic: saving *.ps files
Replies: 6
Views: 11704

saving *.ps files

1. When I try to save a NEURON window as a *.ps file, I get 0 kb file... What can be the problem?

2. How can I edit NEURON figures in other photo editors (eg - CorelDRAW) ?

Thanks in advance.
by udi
Sun Oct 02, 2005 6:32 am
Forum: Getting started
Topic: calculating the "area under the curve"
Replies: 5
Views: 7097

calculating the "area under the curve"

Hi,
I want to compare the size of different ADPs. How do I calculate the area under the curve (e.g - start point is the end of the fAHP / repolarization, end point is RP)?

Thanks in advance,
--Udi.
by udi
Sun Sep 11, 2005 4:02 am
Forum: Getting started
Topic: Somatic current injection
Replies: 1
Views: 5072

Somatic current injection

I want to simulate the affect of somtic current injection in order to hyperpolarize the cell resting potetial. When I do it in the lab I inject negative DC current to the soma during the experiment. When using NEURON, is it sufficient to change Vm (e.g -80 instead of -65) instead of negative current...