EVIDENCE FOR DARK REPAIR OF FAR ULTRAVIOLET LIGHT DAMAGE IN THE BLUE-GREEN ALGA, GLOEOCAPSA ALPICOLA

1979 ◽  
Vol 29 (3) ◽  
pp. 543-547 ◽  
Author(s):  
Edwin Williams ◽  
Joan Lambert ◽  
Philip O'Brien ◽  
James A. Houghton
Keyword(s):  
Ultraviolet Light ◽  
Green Alga ◽  
Blue Green Alga ◽  
Light Damage ◽  
Dark Repair ◽  
Far Ultraviolet

Ultraviolet light induced thymine dimers and repair processes in the alga Eudorina elegans

1972 ◽  
Vol 18 (12) ◽  
pp. 1809-1815 ◽  
Author(s):  
C. L. Kemp ◽  
M. S. Tsao ◽  
G. Thorson
Keyword(s):  
Visible Light ◽  
Ultraviolet Light ◽  
Green Alga ◽  
Uv Irradiation ◽  
Excision Repair ◽  
Uv Exposure ◽  
Dark Repair ◽  
Thymine Dimer ◽  
Thymine Dimers ◽  
Cellular Dna

A fraction of the cellular DNA of the colonial green alga Eudorina elegans strain 1193 can be specifically labeled with 3H-thymidine but not by 3H-thymine. Ultraviolet (UV) irradiation of E. elegans leads to the production of thymine dimers as determined by extraction, hydrolysis, and chromatography of 3H-thymidine-labeled cells. Removal of dimers occurs by processes involving visible light (photoreactivation), but dark repair (excision repair) has not been detected in the labeled fraction. A relationship between UV exposure and thymine dimer production has been determined.

Effect of Iron Limitation on the Ultrastructure of Agmenellum Quadruplicatum

1981 ◽  
Vol 39 ◽  
pp. 410-411
Author(s):  
L. P. Hardie ◽  
D. L. Balkwill ◽  
S. E. Stevens
Keyword(s):  
Growth Medium ◽  
Green Alga ◽  
Natural Habitat ◽  
Iron Limitation ◽  
Natural Environments ◽  
Blue Green Alga ◽  
Marine Cyanobacterium ◽  
Natural Systems ◽  
Thin Sectioning ◽  
Agmenellum Quadruplicatum

Agmenellum quadruplicatum is a unicellular, non-nitrogen-fixing, marine cyanobacterium (blue-green alga). The ultrastructure of this organism, when grown in the laboratory with all necessary nutrients, has been characterized thoroughly. In contrast, little is known of its ultrastructure in the specific nutrient-limiting conditions typical of its natural habitat. Iron is one of the nutrients likely to limit this organism in such natural environments. It is also of great importance metabolically, being required for both photosynthesis and assimilation of nitrate. The purpose of this study was to assess the effects (if any) of iron limitation on the ultrastructure of A. quadruplicatum. It was part of a broader endeavor to elucidate the ultrastructure of cyanobacteria in natural systemsActively growing cells were placed in a growth medium containing 1% of its usual iron. The cultures were then sampled periodically for 10 days and prepared for thin sectioning TEM to assess the effects of iron limitation.

Effects of amino acids on the blue-green alga (cyanobacteria) Tolypothrix scytonemoides (Gardner) Geitler

2006 ◽  
Vol 8 (3) ◽  
pp. 286-293
Author(s):  
Uma Maheshwari Rajendran ◽  
Elango Kathirvel ◽  
Anand Narayanaswamy
Keyword(s):  
Amino Acids ◽  
Green Alga ◽  
Blue Green Alga
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