scholarly journals The Protoplasmic Viscosity of Paramecium

1940 ◽  
Vol 17 (3) ◽  
pp. 317-324
Author(s):  
R. H. J. BROWN
Keyword(s):  
Centrifuge Method ◽  
Protoplasmic Viscosity ◽  
Sources Of Error ◽  
Improved Technique

1. An improved technique for measuring the protoplasmic viscosity of certain types of cell is described. 2. It is shown that the viscosity of Paramecium is not greater than 0.5 c.g.s. unit, and that it may be much less. 3. A simplified type of microscope centrifuge has revealed several sources of error in the centrifuge method customarily employed for the determination of protoplasmic viscosity.

THE DISTRIBUTION OF IONIZATION ALONG UNDERDENSE METEOR TRAILS

1964 ◽  
Vol 42 (11) ◽  
pp. 2035-2047 ◽  
Author(s):  
D. W. Rice ◽  
P. A. Forsyth
Keyword(s):  
Upper Atmosphere ◽  
Sources Of Error ◽  
Signal Characteristics ◽  
Radio Signals ◽  
Meteor Trails

Attempts to use the decay of radio signals reflected from individual meteor trails to study the upper atmosphere have revealed a puzzling inconsistency in the signal behavior. An earlier paper pointed out that this inconsistency remained even when the previously postulated sources of error were eliminated. As a result, an irregularly ionized trail model was proposed and shown, by calculation of signal characteristics, to be capable of accounting for the observations. This paper presents results of a new experiment which permitted the determination of the ionization profiles as the meteor trails were formed. The predicted irregularities were found, even for trails which exhibited apparently "ideal" underdense signal characteristics.

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