منابع مشابه
Electric Impedance of Fertilized Arbacia Egg
In previous work on the alternating current impedance of Arbacia punctulata egg suspensions (Cole and Cole, 1936b), it was found that the unfertilized egg had a static membrane capacity of 0.73/~f./cm. ~ which was independent of the frequency. On fertilization, the low frequency membrane capacity increased to 3.1/~f./cm. 2 and at intermediate frequencies there was evidence of another capacity e...
متن کاملElectric Impedance of the Frog Egg
Electrical impedance measurements were made upon unfertilized and fertilized eggs of the leopard frog, Rana pipiens, over a frequency range of 0.05 to 10 kc. Average values of 170 ohm cm.(2) were obtained for the plasma membrane resistance of the egg, 2.0 microf/cm.(2) for the plasma membrane capacity, 86 degrees for the phase angle of the membrane, and 570 ohm cm. for the specific resistance o...
متن کاملElectric Impedance of Fertilized Arbacia Egg Suspensions
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 effec...
متن کاملElectric Impedance of Single Marine Eggs
Alternating current impedance measurements have been made on several single marine eggs over the frequency range from 1 to 2500 kilocycles per second. The eggs were placed in the center of a short capillary made by heating the end of a 2 mm. thin walled glass tube until it nearly closed, and electrodes were placed in the sea water on each side of the egg. When it is assumed that the membrane co...
متن کاملElectric Impedance
Electrical impedance tomogram of the mammary gland (EIM). Seven planes of scanning. In the sixth and the seventh scans, a retromammary tissue is visualized. It can be used to distinguish tissues and identify pathologies. Lorentz force electrical impedance tomography is an ultrasoundbased medical imaging technique. In this study, a new platform based on electric cell-substrate impedance sensing ...
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ژورنال
عنوان ژورنال: Nature
سال: 1938
ISSN: 0028-0836,1476-4687
DOI: 10.1038/141079b0