Alternating current bridge-amplifier for measurement ofin-vivo high resistance

1970 ◽  
Vol 8 (5) ◽  
pp. 513-515 ◽  
Author(s):  
W. R. Tompkins ◽  
M. Intaglietta
Keyword(s):  
High Resistance ◽  
Alternating Current

scholarly journals ELECTRIC IMPEDANCE OF FERTILIZED ARBACIA EGG SUSPENSIONS

1938 ◽  
Vol 21 (5) ◽  
pp. 583-590 ◽  
Author(s):  
Kenneth S. Cole ◽  
Joseph M. Spencer
Keyword(s):  
Plasma Membrane ◽  
High Resistance ◽  
Sea Water ◽  
High Capacity ◽  
Low Frequency ◽  
Alternating Current ◽  
Electric Impedance ◽  
Perivitelline Space ◽  
Membrane Capacity ◽  
Fertilization Membrane

From the low frequency alternating current impedance and the volume concentrations of suspensions of Arbacia eggs, it is shown that the high resistance membrane is either at or very near the plasma membrane for both unfertilized and fertilized eggs, and that the specific resistances of the perivitelline space and fertilization membrane are not greatly different from that of sea water. The effect of the capacity element which appears after fertilization at intermediate frequencies is considerably less than in the earlier experiments on Arbacia and Hipponoë eggs. These findings indicate that the fertilization membrane does not have the high capacity previously attributed to it and that the increase in membrane capacity takes place at or near the plasma membrane.

scholarly journals Effect of decreasing electrical resistance in Characeae cell membranes caused by the flow of alternating current

2014 ◽  
Vol 63 (3-4) ◽  
pp. 269-273
Author(s):  
Edward Śpiewla ◽  
Małgorzata Tokarska-Schlattner
Keyword(s):  
Activation Energy ◽  
Potassium Channels ◽  
High Resistance ◽  
Electrical Resistance ◽  
Cell Membranes ◽  
Alternating Current ◽  
Increasing Temperature

By means of the techniques of external electrodes and microelectrodes, it was found that evanescent flow of an alternating current through plasmalemma of <i>Characeae</i> cells neutralises oscillatory change in their electrical resistance and reversibly diminishes its value. This effect is particularly significant in the case of "high resistance cells", but it weakens with increasing temperature. The value of the estimated activation energy indicates that, after flow of the alternating current through the membrane, a rapid increase in the conductivity may be caused by an increase in conductivity of potassium channels. This result seems to support the hypothesis of electroconformational feedback.

COPD: Small-Airway Loss Accounts for High Resistance

2011 ◽  
Vol 41 (19) ◽  
pp. 20
Author(s):  
JEFFREY S. EISENBERG
Keyword(s):  
High Resistance ◽  
Small Airway
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