Nodal Definition and 224 Threads

Nodal is a secretory protein that in humans is encoded by the NODAL gene which is located on chromosome 10q22.1. It belongs to the transforming growth factor beta (TGF-β) superfamily. Like many other members of this superfamily it is involved in cell differentiation in early embryogenesis, playing a key role in signal transfer from the node, in the anterior primitive streak, to lateral plate mesoderm (LPM).Nodal signaling is important very early in development for mesoderm and endoderm formation and subsequent organization of left-right axial structures. In addition, Nodal seems to have important functions in neural patterning, stem cell maintenance and many other developmental processes, including left/right handedness.

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  1. T

    How Do I Solve AC Nodal Analysis Equations on an HP 50g Calculator?

    I've got a small issue at hand right now. I need to solve simultaneous equations with unknowns in order to do mesh and nodal analysis problems. The issue is, i can't figure out how to enter the equations into get an answer out. My previous calculator was a t183+, so I'm not that well...
  2. J

    Solving Question 1(b) Using Nodal Analysis

    Homework Statement i haVE tried to solve it no. of ways but i didn't get the right answer. Please have a look on the question 1(b) in attachment Figure 1(a), I want to know that how can i solve this question by using nodal analysis. Please explain your answer as well so i could clear my...
  3. A

    Master Loop and Nodal Analysis with Expert Tips and E-books

    Could u guys reccomend some e books for loop and nodal analysis . I am having some problems implenting the methods to solve poblems. or may be u could give me some tips
  4. C

    Number of Nodal Lines in Two-Point Interference Pattern

    Homework Statement In a two - point in phase inteference pattern, what will happen to the number of nodal lines if the wavelength of the two sources increases? Justify your answer Homework Equations Not too sure if an equation is needed to answer this question The Attempt at a...
  5. B

    Helping setting up Nodal Equations

    Helping setting up Nodal Equations... Homework Statement I need to find the node voltages at N1 and N2. See attachment for circuit. The Attempt at a Solution I think I need to setup KCL at each node. At Node 1, I got this: (v1-v2)/12 - (v3-v2)/20 - (v2-0)/40 =0 v1 is the...
  6. E

    Circuit Nodal voltage question out thanks

    Circuit Nodal voltage question...please help out thanks! Homework Statement The question is as follows: Start with KCL for the nodes and write the node voltage equations for the nodes V1 and v2 in the circuit (diagram is attached to this post). They do not want me to solve the equations...
  7. RadiationX

    Nodal & Mesh Matrix Equations By Inspection.

    My circuit analysis professor showed us a method of nodal/mesh analysis today that allows us to write the matrix equations for either nodal/mesh analysis just by inspection of the circuit. Is anyone familiar with this method or ever heard of it? The circuits that he used this technique...
  8. V

    I really need to learn how to do Nodal Analysis by Inspection before Wednesday

    I really need to learn how to do "Nodal Analysis by Inspection" before Wednesday! My Prof. told us (very quickly) about some easy method for circuit analysis called "Inspection". Can someone explain, in detail, how this is done? If you want a circuit to demonstrate on, just check my old posts...
  9. N

    Angles of Nodal Lines (Two point light source)

    A two-point source operates at a frequency of 1.0Hz to produce an interference pattern in a ripple tank. The sources are 2.5cm apart and the wavelength of the waves is 1.2 cm. Calculate the angles at which the nodal lines in the pattern are located far from the sources. (assume the angles...
  10. R

    Help! Solving Nodal Equation for Vx @ Op-Amp Node

    Hi, I am having trouble filling out the nodal equation for the node of the first op-amp towards the left. Let's say that node voltage is Vx. (V-) I know that, Vx - 5 / 70k + ~~~~ = 0... I don't know what to put for the ~~~~ part. I know the current has to equal the current across teh 70kohm...
  11. D

    Engineering Nodal Analysis For Circuits class

    Homework Statement Hi guys, I solved this problem out. I'm just curious as to see if my work is valid. I strongly believe it is, but perhaps you can help me. I do have a quick question... once I've found all the voltages at specific nodes, I_o is the difference of the voltage / resistance...
  12. R

    Simple Nodal Analysis: Solving Homework

    Homework Statement http://img258.imageshack.us/img258/2152/screenshot01kf5.th.jpg Homework Equations KCL KVL V = IR The Attempt at a Solution I used 4 nodes at the top, one reference node at the bottom. I have it labeled V1, V2, V3, V4, starting from the far left -> right. My nodal...
  13. V

    Engineering Solve V_0 & I_0 in Circuit w/ Nodal Analysis

    Homework Statement Using nodal analysis, find v_0 and I_0 in the circuit below. http://img248.imageshack.us/img248/7325/chapter3problem301dy.jpg Homework Equations KVL, KCL, V = i R, Super-nodeThe Attempt at a Solution So I added 3 current variables, 3 node markers (V_1\,-\,V_3), a super...
  14. V

    Engineering Solve V_A in Circuit with Nodal Analysis

    Homework Statement Use nodal analysis to find V_A in the circuit below. http://img180.imageshack.us/img180/7004/chapter3problem236vy.jpg Homework Equations KVL, KCL, v = i R, super-node?The Attempt at a Solution I made a few currents and showed the obvious KVL loop...
  15. V

    Understanding Nodal Analysis: Exploring Voltage Distribution in Circuits

    Hi, I just have a quick question about nodal analysis in the attached file. At v1 and v3, is it not necessary to take into account the current going to the right and left respectivley? So at v1, -6V + (v1 - v2 / 6k) and at v3, 24V + (v2 - v3/4k) Thanks a lot!
  16. V

    Solving for v_1, v_2, and v_3 with Nodal Analysis

    Find v_1,\,v_2,\,and\,v_3 in the circuit below using nodal analysis: My work so far: I\,=\,\frac{v_1}{2\Omega},\,\,I_1\,=\,\frac{v_2}{4\Omega},\,\,I_2\,=\,\frac{v_3}{3\Omega},\,\,I_3\,=\,\frac{v_1\,-\,v_3}{6\Omega} KVL @ loop1 => -I\,(2\Omega)\,+\,10\,V\,+\,I_1(4\Omega)\,=\,0...
  17. J

    Nodal Points in Sound: Significance Explained

    Hello everybody, my apologies if this is a stupid question. Under the sound (specifically vibrations and waves) unit in my textbook, it briefly mentions nodes. However, it merely describes it as a "centre point [that] always stays at the equilibrium and never vibrates." My question is...
  18. 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...
  19. C

    Solving Network Nodal Voltages & Voltage-to-Current Conversion Tutorial

    Can someone direct me to a tutorial for solving network nodal voltages. Also need to learn how to convert voltage source to a current source.
  20. R

    Need Help with Nodal Surfaces in Chemistry

    Hello, New to chemistry need help with this question and I don't understand what a nodal surface is How mnay nodal surfaces are there for a) a 2s orbital b) a 3px orbital If anyone can help me that would be great. Thank you
  21. S

    Second Nodal Line: Wave Length Approximation

    Ok here's the problem: Waves are produced by two point sources S and S' vibrating in phase. SEe the accompanying diagram. X is apoint on the second nodal line. The path difference SX - S'X is 4.5cm The wavelength of the waves is approxiately______. ````` o X ``````| ``````| ``````|...
  22. W

    Understanding Nodal Surfaces: How Many are There in an Orbital?

    Hey just need a quick clarification here. I am reading conflicting arguments. One argument states that to find the nodal surfaces of an orbital you take the result of n-1 the other argument states that the number of nodal surfaces of an orbital is equal to n. Can someone please clear this...
  23. F

    Solving Circuits with the Nodal Method: Finding Va

    nodal voltage?? im not real sure on how solve circuits using the nodal method. I've got an equation for node a but i don't know how to solve it. here's the equation (90-Va)/20 - (Vb-Va)/3 + Va/20 - Ia = 0 thats at node a. how do i solve this? Ia = 6 A
  24. O

    What Causes and Crosses Orbital Nodal Forces?

    I am wondering what forces cause the nodes between orbitals to occur, and if these nodes are ever penetrated or crossed by electrons during exitation of the atom.
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