Carbon Dioxide Transfer and Photochemical Activities as Factors of Photosynthesis during Ontogenesis of Primary Bean Leaves

1975 ◽  
pp. 159-166 ◽  
Author(s):  
Z. Šesták ◽  
J. Čatský ◽  
Jarmila Solárová ◽  
Helena Strnadová ◽  
Ingrid Tichá
1978 ◽  
Vol 20 (5) ◽  
pp. 368-372 ◽  
Author(s):  
Jana Pospíšilová ◽  
Ingrid Tichá ◽  
J. Čatský ◽  
Jarmila Solárová

Author(s):  
B. Wróblewska ◽  
M. Siedlecka ◽  
J. W. Poskuta

SynopsisThe responses of photosynthesis to oxygen concentration 2, 21 and 100% by etiolated bean leaves upon illumination were determined. After 0.3, 3, 6, 10, 12 and 24 h of greening the following processes were measured. (1) Functioning of PS II as reflected by changes in Fv/Fm ratios and t1/2 values. (2) Content and composition of pigments. (3) Capacity for carbon dioxide assimilation. The results showed that O2 exerts a complex inhibitory action on examined processes. The magnitudes of inhibition increased with increasing of O2 concentration and time of its action. Under applied conditions the lag phase for development of examined processes (with the exception of carotenoids) was in the range 3-10 h. After 24 h of greening in 2, 21 and 100% of O2 the Fy/Fm ratios attained values 0.55, 0.45, 0.13 respectively as compared with typical 0.80 of normal green leaves of bean. After 24 h of greening the inhibition by 100% O2 as compared with zero inhibition by 2% O2 were, in percentages: Fw/Fm, 78; t1/2, 77; chlorophyll a, 59; chlorophyll b, 69; β-carotene, 78; neoxanthin, 60; zeaxanthin, 43; violaxanthin, 35; CO2 fixation, 95.


Author(s):  
K. C. Tsou ◽  
J. Morris ◽  
P. Shawaluk ◽  
B. Stuck ◽  
E. Beatrice

While much is known regarding the effect of lasers on the retina, little study has been done on the effect of lasers on cornea, because of the limitation of the size of the material. Using a combination of electron microscope and several newly developed cytochemical methods, the effect of laser can now be studied on eye for the purpose of correlating functional and morphological damage. The present paper illustrates such study with CO2 laser on Rhesus monkey.


Author(s):  
Charles TurnbiLL ◽  
Delbert E. Philpott

The advent of the scanning electron microscope (SCEM) has renewed interest in preparing specimens by avoiding the forces of surface tension. The present method of freeze drying by Boyde and Barger (1969) and Small and Marszalek (1969) does prevent surface tension but ice crystal formation and time required for pumping out the specimen to dryness has discouraged us. We believe an attractive alternative to freeze drying is the critical point method originated by Anderson (1951; for electron microscopy. He avoided surface tension effects during drying by first exchanging the specimen water with alcohol, amy L acetate and then with carbon dioxide. He then selected a specific temperature (36.5°C) and pressure (72 Atm.) at which carbon dioxide would pass from the liquid to the gaseous phase without the effect of surface tension This combination of temperature and, pressure is known as the "critical point" of the Liquid.


2001 ◽  
Vol 7 (7) ◽  
pp. 789-796 ◽  
Author(s):  
L. H. Ziska ◽  
O. Ghannoum ◽  
J. T. Baker ◽  
J. Conroy ◽  
J. A. Bunce ◽  
...  

2007 ◽  
Vol 177 (4S) ◽  
pp. 319-319
Author(s):  
Naoto Sassa ◽  
Ryohei Hattori ◽  
Yoshinari Ono ◽  
Tokunori Yamamoto ◽  
Momokazu Gotoh

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