Action of gibberellic acid (GA3) on dormancy and activity of alpha-amylase in rice seeds

To evaluate the effectiveness of gibberellic acid (GA3) in breaking rice seed dormancy and the use of alpha-amylase enzyme activity as an indicator of the dormancy level, seed from the intensively dormant irrigated cultivar Urucuia were used. The seeds were submitted to a pre-drying process in a forced air circulation chamber under 40ºC during 7 days and submersed in 30 mL of GA3 solution under 0, 10, 30 and 60 mg/L H2O concentrations, during 2, 24 and 36 hours. After the treatments, the alpha-amylase activity was determined by using the polyacrilamide electrophoresis and spectrophotometry. At the same time, the germination test was made. The results indicated a gain in germination and in alpha-amylase activity in higher concentrations and soaking time of seeds in GA3. These observations support the conclusion that soaking seed in 60 mg GA3/L during 36 hours can be used as a quick and efficient treatment in breaking rice seed dormancy and is equivalent to the forced air circulation chamber at 40ºC during 7 days. The alpha-amylase enzyme activity proved to be as an efficient marker of the seeds dormancy level.

A framework to understand human action

This paper consists in an analysis of two explanatory models of human behaviour which play a prominent role in the contemporary literature on human action. The first model - the causalist - aims at explaining action in terms of causes and general laws. The second model - the intentionalist - explains human action in terms of intentions and practical syllogism. The difficulties of both models are presented and in the last part of the essay we propose one alternative model, based on the notion of retroduction.

Open Access in Times of Knowledge Unlatched : Cooperative Action for Books and Journals

Presentation at the seminar "Publishers and Funders for OA in Finland", Helsinki, May 24, 2016

Almanach de l'Action française

Etat de collection : 1921 (11e année)-1928 (20e année)

L'Action régionaliste : organe... de la Fédération régionaliste française

1909 (A8,N1)- (A8,N12).

L'Action régionaliste : organe... de la Fédération régionaliste française

1903 (A2,N1)- (A2,N9).

L'Action régionaliste : organe... de la Fédération régionaliste française

1914 (A13,N3)- (A13,N12).

L'Action régionaliste : organe... de la Fédération régionaliste française

1906 (A5,N1)- (A5,N12).

L'Action régionaliste : organe... de la Fédération régionaliste française

1907 (A6,N1)- (A6,N11).

L'Action régionaliste : organe... de la Fédération régionaliste française

1904 (A3,N1)- (A3,N12).

L'Action régionaliste : organe... de la Fédération régionaliste française

1939.

L'Action régionaliste : organe... de la Fédération régionaliste française

1912 (A11,N1)- (A11,[N12]).