scholarly journals Action of Nalidixic Acid on Chloroplast Replication in Euglena gracilis

1975 ◽  
Vol 55 (2) ◽  
pp. 390-392 ◽  
Author(s):  
Harvard Lyman ◽  
Ann S. Jupp ◽  
Ignacio Larrinua
Keyword(s):  
Nalidixic Acid ◽  
Euglena Gracilis ◽  
Chloroplast Replication

Chloroplast replication in synchronously dividing Euglena gracilis

Planta ◽  
1973 ◽  
Vol 115 (2) ◽  
pp. 125-134 ◽  
Author(s):  
Rosalinda Boasson ◽  
Sarah P. Gibbs
Keyword(s):  
Euglena Gracilis ◽  
Chloroplast Replication

scholarly journals STUDIES ON CHLOROPLAST DEVELOPMENT AND REPLICATION IN EUGLENA

1969 ◽  
Vol 41 (2) ◽  
pp. 431-440 ◽  
Author(s):  
Edgar F. Carell
Keyword(s):  
Cell Division ◽  
Vitamin B12 ◽  
Euglena Gracilis ◽  
Chloroplast Development ◽  
Vitamin B12 Deficiency ◽  
Normal Growth ◽  
Cell Protein ◽  
Chloroplast Replication ◽  
B12 Deficiency ◽  
Cellular Replication

When Euglena gracilis is grown under vitamin B12 deficiency conditions, the amount of protein and of chlorophyll per cell increase with decrease of B12 in the medium and consequently in the cell. The increase in cell protein is proportional to and precedes an increase in the number of chloroplasts per cell. This replication of the chloroplasts under deficiency conditions is not accompanied by nuclear or cell division. It is concluded that chloroplast replication in Euglena gracilis is independent of nuclear and cellular replication, at least under B12 deficiency conditions. We established a graph of the growth of Euglena under different concentrations of vitamin B12 added to the growth medium, which permitted us to calculate that at least 22,000 molecules of vitamin B12 per cell are required to give normal growth.

Organization of the Pellicle and the Muciferous Glands in Euglena Gracilis

1970 ◽  
Vol 28 ◽  
pp. 104-105
Author(s):  
Hilton H. Mollenhauer ◽  
W. Evans
Keyword(s):  
Plasma Membrane ◽  
Euglena Gracilis ◽  
Complex Forms ◽  
Secondary Periodicity

The pellicular structure of Euglena gracilis consists of a series of relatively rigid strips (Fig. 1) composed of ridges and grooves which are helically oriented along the cell and which fuse together into a common junction at either end of the cell. The strips are predominantly protein and consist in part of a series of fibers about 50 Å in diameter spaced about 85 Å apart and with a secondary periodicity of about 450 Å. Microtubules are also present below each strip (Fig. 1) and are often considered as part of the pellicular complex. In addition, there may be another fibrous component near the base of the pellicle which has not yet been very well defined.The pellicular complex lies underneath the plasma membrane and entirely within the cell (Fig. 1). Each strip of the complex forms an overlapping junction with the adjacent strip along one side of each groove (Fig. 1), in such a way that a certain amount of sideways movement is possible between one strip and the next.

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