scholarly journals Electrical Membrane Properties and Circadian Rhythm in Extensor Cells of the Laminar Pulvini of Phaseolus coccineus L.

1980 ◽  
Vol 65 (5) ◽  
pp. 966-968 ◽  
Author(s):  
Crescentia Freudling ◽  
Walter-Erich Mayer ◽  
Dietrich Gradmann
Keyword(s):  
Circadian Rhythm ◽  
Phaseolus Coccineus ◽  
Membrane Properties

Are membrane properties essential for the circadian rhythm of Gonyaulax?

1984 ◽  
Vol 247 (2) ◽  
pp. R250-R256
Author(s):  
H. G. Scholubbers ◽  
W. Taylor ◽  
L. Rensing
Keyword(s):  
Circadian Rhythm ◽  
Phase Shift ◽  
Fluorescence Polarization ◽  
The Other ◽  
Membrane Properties ◽  
Response Curves ◽  
Whole Cells ◽  
Different Temperatures ◽  
Free Running ◽  
Free Running Period

Membrane properties of whole cells of Gonyaulax polyedra were measured by fluorescence polarization. Circadian changes of fluorescence polarization exist in exponentially growing cultures. They show an amplitude larger than that of stationary cultures, indicating that a part of the change is due to or amplified by an ongoing cell cycle. Measurements of parameters of the circadian glow rhythm were analyzed for possible correlation with the membrane data. Considerable differences (Q10 = 2.5-3.0) in fluorescence polarization were found in cultures kept at different temperatures ranging from 15 to 27.5 degrees C. The free-running period length at different temperatures, on the other hand, differed only slightly (Q10 = 0.9-1.1). Stationary cultures showed higher fluorescence polarization compared with growing cultures, whereas the free-running period lengths did not differ in cultures of various densities and growth rates. Temperature steps of different sign changed the fluorescence polarization slightly in different directions. The phase shift of 4-h pulses (-5, -9, +7 degrees C) resulted in maximal phase advances of 4, 6, and 2 h, respectively. The phasing of the phase-response curves was identical in all these experiments, a finding not to be expected if the pulses act via the measured membrane properties. Pulses of drugs that change the fluorescence polarization (e.g., chlorpromazine and lidocaine) did not or only slightly phase-shift the circadian rhythm.

Phase Shifting Effect of Caffeine in the Circadian Rhythm of Phaseolus coccineus L

1975 ◽  
Vol 30 (11-12) ◽  
pp. 855-856 ◽  
Author(s):  
W. Mayer ◽  
I. Scherer
Keyword(s):  
Circadian Rhythm ◽  
Phaseolus Coccineus ◽  
Phase Shifting ◽  
Leaf Movement ◽  
Circadian Leaf Movement

Abstract Caffeine, Circadian Rhythm, Sleep and Wakefulness, Phaseolus coccineus L. 4-hour caffeine pulses (10 mᴍ) offered via the trans­ piration stream advances or delays the phase of the circadian leaf movement rhythm of Phaseolus coccineus as a function of the phase of application. It is hypothesized that the caffeine effect upon sleep and wakefulness in man is partly due to this phase-shifting effect.

A circadian rhythm in adult idiopathic epistaxis?

1998 ◽  
Vol 23 (3) ◽  
pp. 280-280 ◽  
Author(s):  
Mehanna ◽  
Robinson ◽  
Gatehouse ◽  
Mcgarry
Keyword(s):  
Circadian Rhythm ◽  
Idiopathic Epistaxis

Lights Beat Melatonin for Circadian Rhythm Shift

2005 ◽  
Vol 38 (10) ◽  
pp. 19
Author(s):  
SHERRY BOSCHERT
Keyword(s):  
Circadian Rhythm

Light and Melatonin Can Reset Circadian Rhythm

2008 ◽  
Vol 36 (5) ◽  
pp. 48
Author(s):  
JANE SALODOF MACNEIL
Keyword(s):  
Circadian Rhythm

Physicochemical study of basement membrane properties iii. diffusion of proline, glucose and insulin in krebs solution

1988 ◽  
Vol 85 ◽  
pp. 391-397
Author(s):  
Bo Tao Fan ◽  
Françoise Simonnet ◽  
Jean Schaeverbeke ◽  
Gérard Lapluye
Keyword(s):  
Basement Membrane ◽  
Membrane Properties ◽  
Physicochemical Study ◽  
Krebs Solution
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