Mechanical restoration of irritability and of the potassium effect

PROTOPLASMA ◽  
1936 ◽  
Vol 25 (1) ◽  
pp. 156-156
Keyword(s):  
Potassium Effect

scholarly journals SOME CHEMICAL ASPECTS OF THE POTASSIUM EFFECT

1940 ◽  
Vol 23 (4) ◽  
pp. 429-432 ◽  
Author(s):  
W. J. V. Osterhout
Keyword(s):  
Partition Coefficient ◽  
Organic Substances ◽  
Experimental Control ◽  
Or Groups ◽  
Potassium Effect

The ability of Nitella to distinguish electrically between Na+ and K+ (potassium effect) appears to depend on several organic substances (or groups of substances). Of these RMK and RSK determine the mobility and partition coefficient (S) respectively of K+ while RMNa and RSNa do the same for Na+. These substances can vary independently and this variation is susceptible to experimental control.

The coordinate roles of branchial nerve activity and potassium in the stimulation of ciliary activity in Mytilus edulis: observations with phenoxybenzamine, bromolysergic acid and fluorescence histochemistry

1976 ◽  
Vol 65 (1) ◽  
pp. 109-116
Author(s):  
A. A. Paparo
Keyword(s):  
Mytilus Edulis ◽  
Nerve Stimulation ◽  
High Frequency ◽  
Low Frequency ◽  
Ciliary Activity ◽  
Nerve Activity ◽  
Basal Rate ◽  
Potassium Effect ◽  
Branchial Nerve ◽  
Stimulation Of

Potassium concentrations in excess of 30 mM increase the rate of beating of lateral cilia on the gill of Mytilus edulis. Cilioexcitation produced by low frequency (5 beats/s) electrical stimulation was potentiated with potassium but blocked with bromolysergic acid (a serotonergic inhibitor). Cilioinhibition produced by high frequency (50 beats/s) stimulation was decreased with potassium and phenoxybenzamine (a dopaminergic inhibitor). Phenoxybenzamine enhanced the cilioexcitation produced by potassium. Potassium doses incapable of maintaining a basal rate of beating (less than 30 mM) could increase ciliary activity if phenoxybenzamine was also added. After transection of the branchial nerve, the yellow-fluorophore (serotonergic storage) and cilioexcitatory effect of potassium gradually decrease. This study shows that the potassium effect on ciliary activity (a) increase with low frequency nerve stimulation, presumably through the release of serotonin and (b) decreases with high frequency nerve stimulation, presumably through the release of dopamine.

scholarly journals MECHANICAL RESTORATION OF IRRITABILITY AND OF THE POTASSIUM EFFECT

1935 ◽  
Vol 18 (5) ◽  
pp. 687-694 ◽  
Author(s):  
S. E. Hill ◽  
W. J. V. Osterhout
Keyword(s):  
Distilled Water ◽  
Action Current ◽  
Protoplasmic Surface ◽  
Normal Behavior ◽  
Inner Surface ◽  
Potassium Effect ◽  
Outer Protoplasmic Surface

Treatment of Nitella with distilled water apparently removes from the cell something which is responsible for the normal irritability and the potassium effect, (i.e. the large P.D. between a spot in contact with 0.01 M KCl and one in contact with 0.01 M NaCl). Presumably this substance (called R) is partially removed from the protoplasm by the distilled water. When this has happened a pinch which forces sap out into the protoplasm can restore its normal behavior. The treatment with distilled water which removes the potassium effect from the outer protoplasmic surface does not seem to affect the inner protoplasmic surface in the same way since the latter retains the outwardly directed potential which is apparently due to the potassium in the sap. But the inner surface appears to be affected in such fashion as to prevent the increase in its permeability which is necessary for the production of an action current. The pinch restores its normal behavior, presumably by forcing R from the sap into the protoplasm.

Potassium effect on iron stress in tomato. I. The effect on pH, Fe‐reductase and chlorophyll

1990 ◽  
Vol 13 (2) ◽  
pp. 215-229 ◽  
Author(s):  
Malgorzata Szlek ◽  
Gene W. Miller ◽  
George W. Welkie
Keyword(s):  
Iron Stress ◽  
Potassium Effect

Potassium effect in K-Ni(Co)PW/Al2O3 catalysts for selective hydrotreating of model FCC gasoline

2017 ◽  
Vol 203 ◽  
pp. 237-246 ◽  
Author(s):  
D. Ishutenko ◽  
P. Minaev ◽  
Yu. Anashkin ◽  
M. Nikulshina ◽  
A. Mozhaev ◽  
...  
Keyword(s):  
Fcc Gasoline ◽  
Potassium Effect

scholarly journals CHEMICAL RESTORATION IN NITELLA

1940 ◽  
Vol 24 (1) ◽  
pp. 7-8 ◽  
Author(s):  
W. J. V. Osterhout
Keyword(s):  
Distilled Water ◽  
Appropriate Treatment ◽  
Potassium Effect ◽  
Chemical Restoration

Leaching in distilled water may remove irritability and the potassium effect in Nitella but both of these may be restored by appropriate treatment with guanidine.

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