Comparative study of the effects of temperature on net photosynthesis and respiration in lichens from the antarctic and subalpine zones in Japan

1985 ◽  
Vol 98 (1) ◽  
pp. 41-53 ◽  
Author(s):  
Yoshio Ino
Keyword(s):  
Comparative Study ◽  
Net Photosynthesis ◽  
Effects Of Temperature ◽  
The Antarctic ◽  
Photosynthesis And Respiration

scholarly journals Comparative Study of Chemical Stability of Two H1Antihistaminic Drugs, Terfenadine and ItsIn VivoMetabolite Fexofenadine, Using LC-UV Methods

2019 ◽  
Vol 2019 ◽  
pp. 1-10
Author(s):  
Anna Gumieniczek ◽  
Anna Berecka-Rycerz ◽  
Rafał Pietraś ◽  
Izabela Kozak ◽  
Karolina Lejwoda ◽  
...  
Keyword(s):  
Comparative Study ◽  
Chemical Stability ◽  
First Order ◽  
First Order Kinetics ◽  
Kinetics Of Degradation ◽  
Effects Of Temperature ◽  
High Doses ◽  
Antihistaminic Drugs ◽  
Kinetics Of

A comparative study of chemical stability of terfenadine (TER) and itsin vivometabolite fexofenadine (FEX) was performed. Both TER and FEX were subjected to high temperature at different pH and UV/VIS light at different pH and then quantitatively analyzed using new validated LC-UV methods. These methods were used to monitor the degradation processes and to determine the kinetics of degradation for both the compounds. As far as the effects of temperature and pH were concerned, FEX occurred more sensitive to degradation than TER. As far as the effects of UV/VIS light and pH were concerned, the both drugs were similarly sensitive to high doses of light. Using all stress conditions, the processes of degradation of TER and FEX followed the first-order kinetics. The results obtained for these two antihistaminic drugs could be helpful in developing their new derivatives with higher activity and stability at the same time.

Effects of temperature treatment on corn cob composting and reducing of composting time: a comparative study

2009 ◽  
Vol 28 (10) ◽  
pp. 882-887 ◽  
Author(s):  
Mehran Kianirad ◽  
Mohammad Muazardalan ◽  
Gholamreza Savaghebi ◽  
Mohsen Farahbakhsh ◽  
Saeed Mirdamadi
Keyword(s):  
Comparative Study ◽  
Temperature Treatment ◽  
Corn Cob ◽  
Effects Of Temperature

Comparative Study between Candida antarctica Lipase B and Pseudomonas floroscens as Catalyst for Polycaprolactone Production

2012 ◽  
Vol 626 ◽  
pp. 547-550
Author(s):  
Senthil Kumar Senthil ◽  
M.H. Uzir ◽  
Z. Ahmad
Keyword(s):  
Molecular Weight ◽  
Reaction Time ◽  
Comparative Study ◽  
Ring Opening ◽  
Gradual Increase ◽  
Candida Antarctica ◽  
Novozym 435 ◽  
Lipase B ◽  
Polymerization System ◽  
Effects Of Temperature

The Effects of temperature on ring-opening bulk polymerizations of ε-caprolactone was studied by using two different lipases Novozym 435 (immobilized form of lipase B from Candida antarctica), and Pseudomonas Floroscens as biocatalyst. The polymerization of ε-caprolactone was carried out at 50°C, 60°C, 70°C, 80°C, 90°C, and 100°C. For Novozym 435 the results showed that increasing the reaction time of the polymerization system resulted in an increased rate of monomer consumption and hence increased the molecular weight. For an increase in reaction time the conversion increases steadily and after a gradual increase there is a decrease which is found uniform for all the temperature showing a uniform trend. For a temperature of 70°C and 4 hours molecular weight was found to be 8.4 x 104 daltons which were the highest of all the readings that were obtained. In the copolymerizaton of ε-caprolactone (ε-CL) and δ-valerolactone using Pseudomonas fluorescens lipase at 60°C for 20 days a copolymer with molecular weight of 1.97 x 105 was obtained. Effects of the reaction time and temperature on the copolymerization have been examined.

Inhibition of Metabolic Hydrogen Ion Flux Resulting from Cadmium Stress in Aquatic Microecosystems

1987 ◽  
Vol 19 (11) ◽  
pp. 85-94
Author(s):  
William D. Nicholas ◽  
A. Ray Abernathy
Keyword(s):  
Net Photosynthesis ◽  
Cadmium Stress ◽  
Effective Concentration ◽  
Hydrogen Ion ◽  
Ph Change ◽  
Control Data ◽  
Data Set ◽  
Analysis Techniques ◽  
Photosynthesis And Respiration ◽  
Periodic Changes

Periodic changes in pH were monitored at 30 s intervals in naturally-derived, aquatic microeco-systems. The pH of the system was controlled between two setpoints with a microcomputer. When the upper setpoint was reached a light bank was turned off until the pH dropped to the lower setpoint and the light was again turned on. The cycling of the pH in the microcosms was analyzed using time series analysis techniques. Each experiment resulted in a 24 hour control data set and a 24 hour experimental data set that began with the addition of an inhibitor or toxicant. EC50 values (effective concentration for 50% inhibition) of net photosynthesis and respiration of the community were calculated from slopes of the periodic response to cadmium and compared to literature values. The EC50 for dark induced pH change was 3.8 ppm while the EC50 for light induced pH change was 0.51 ppm. Increasing cadmium concentrations caused dominant peaks in the variance periodograms to be shifted to longer periods.

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