Vegetative survival, akinete formation and germination in three blue-green algae and one green alga in relation to light intensity, temperature, heat shock and UV exposure

2000 ◽  
Vol 45 (5) ◽  
pp. 439-446 ◽  
Author(s):  
S. C. Agrawal ◽  
V. Singh
Keyword(s):  
Heat Shock ◽  
Light Intensity ◽  
Green Algae ◽  
Green Alga ◽  
Uv Exposure ◽  
Blue Green Algae ◽  
Akinete Formation ◽  
Temperature Heat ◽  
Vegetative Survival

scholarly journals Light Penetration into Fresh Water

1934 ◽  
Vol 11 (1) ◽  
pp. 89-93
Author(s):  
W. H. PEARSALL ◽  
PHILIP ULLYOTT
Keyword(s):  
Light Intensity ◽  
Fresh Water ◽  
Green Algae ◽  
Aquatic Plants ◽  
Submerged Vegetation ◽  
Light Penetration ◽  
Blue Green Algae

1. The penetration of light into Windermere is dependent chiefly on the numbers of phytoplankton organisms in the epilimnion. 2. It appears that the greatest depth at which rooted aquatic plants can grow must therefore be affected by the abundance of phytoplankton. The rooted plants are most active during July and August. Observations show that at this time the presence of blue-green algae reduces the light intensity at the limit of submerged vegetation (4·3 metres) by more than 50 per cent.

Cellular Effects of Herbicide Simazine on Blue-Green Algae

1982 ◽  
Vol 40 ◽  
pp. 324-325
Author(s):  
R.S. Mehta ◽  
K.W. Hawxby
Keyword(s):  
Green Algae ◽  
Green Alga ◽  
Anacystis Nidulans ◽  
Blue Green Alga ◽  
Blue Green Algae ◽  
Cellular Effects

This study is sought to compare the effects of herbicide simazine (2-chloro 4,-6-bis (ethylamino)-S-triazine) on cellular corrponents of control and the treated cells of the blue-green alga (cyanobacterium) Anacystis nidulans, which are well defined and documented. The extent to which this initial interpretation of observations are realities, must be determined by biochemical and perhaps cytochemical techniques as well.

Stickstoff-Ausscheidung durch N 2-fixierende Blaualgen, III / Nitrogen Excretion by Nitrogen Fixing Blue-green Algae, III

1975 ◽  
Vol 30 (3-4) ◽  
pp. 223-226 ◽  
Author(s):  
P. Pohl ◽  
G. Rath
Keyword(s):  
Green Algae ◽  
Green Alga ◽  
Growth Conditions ◽  
Nitrogen Excretion ◽  
Blue Green Alga ◽  
Nitrogen Fixing ◽  
Blue Green Algae ◽  
Combined Nitrogen ◽  
Nitrogen Levels ◽  
Filamentous Green Algae

Abstract The total combined nitrogen (850 //mol N/1) excreted by the nitrogen fixing blue-green alga, A nabaena cylin drica, during growth in an artificial nutrient medium, was subsequently utilized to a different degree by various green algae. Two species of filamentous green algae, Chlorhormidium spec, (strain I) and Chlorhorm idium spec, (strain II), proved to be most suitable: When grown in the above nitrogen-enriched medium after removal of A nabaena cylindrica, they lowered the nitrogen level in the medium from 850 to 460 - 600//mol N/1 within 29 days. When another nitrogen fixing blue-green alga, Anabaena solitaria, was grown under unsterile conditions in mixtures of freshwater and seawater with trace elements (Fe, Mn, and Mo) added, nitrogen levels of 1000 - 1060 //mol N/1 were obtained. These levels were subsequently lowered to 530 - 570 //mol N/1 by the two species of Chlorhorm idium . Under appropriate growth conditions, the combined nitrogen excreted by Anabaena solitaria can possibly be utilized as a nitrogen source for green algae

Stickstoff-Ausscheidung durch N2-fixierende Blaualgen, II / Nitrogen Excretion by Nitrogen Fixing Blue-green Algae, II

1975 ◽  
Vol 30 (3-4) ◽  
pp. 219-222 ◽  
Author(s):  
P. Pohl ◽  
G. Drath
Keyword(s):  
Nitrogen Content ◽  
Green Algae ◽  
Green Alga ◽  
Mass Production ◽  
Nutrient Medium ◽  
Nitrogen Excretion ◽  
Blue Green Alga ◽  
Nitrogen Fixing ◽  
Blue Green Algae ◽  
Chlorophyll Formation

Abstract Wachstum und Stickstoff-Ausscheidung von Anabaena solitaria bei Züchtung in Süß­ wasser bzw. in Mischungen aus Süß-und Seewasser sowie unter Zusatz von Fe, Mn und Mo Nitrogen Excretion by Nitrogen Fixing Blue-green Algae, II Growth and Nitrogen Excretion of Anabaena solitaria Grown in Freshwater and in Mixtures of Freshwater and Seawater, as Well as with Fe, Mn, and Mo Added to the Nutrient Medium Nitrogen Excretion, Nitrogen Fixing Blue-green Algae, Anabaena solitaria, Blue-green Algae The nitrogen fixing blue-green alga, Anabaena solitaria, was grown in freshwater and in mixtures of freshwater and seawater. Freshwater and a 5% mixture (95 volumes of freshwater and 5 volumes of seawater) proved to be most suitable: Growth (as expressed by the formation of chlorophylls; approx. 1.9 u g chlorophyll/ml) was comparatively high. The nitrogen content of the nutrient medium was increased to 750 - 760 //mol N/1. Upon addition of appropriate amounts of FeCl3 , MnCl2 , and Na2MoO4 , the nitrogen content reached 1060 -1080//mol N /1, whereas the chlorophyll formation remained at approximately the same level. Thus Fe, Mn, and Mo appear to have a stimulating effect on nitrogen excretion by Anabaena solitaria. Under the conditions de­ scribed, this organism may be suitable for the mass production of algae.

Maximum carbon isotope fractionation in photosynthesis by blue-green algae and a green alga

1976 ◽  
Vol 40 (3) ◽  
pp. 309-312 ◽  
Author(s):  
Joseph W Pardue ◽  
Richard S Scalan ◽  
Chase Van Baalen ◽  
Patrick L Parker
Keyword(s):  
Carbon Isotope ◽  
Green Algae ◽  
Green Alga ◽  
Isotope Fractionation ◽  
Blue Green Algae ◽  
Carbon Isotope Fractionation

Special aspects of nitrogen fixation by blue-green algae

1969 ◽  
Vol 172 (1029) ◽  
pp. 357-366 ◽  
Keyword(s):  
Carbon Dioxide ◽  
Nitrogen Fixation ◽  
Light Intensity ◽  
Green Algae ◽  
Limited Extent ◽  
Anabaena Cylindrica ◽  
Fixed Nitrogen ◽  
Normal Cells ◽  
Blue Green Algae ◽  
Reducing Potential

When carbon dioxide fixation was over 90 % inhibited by CMU , nitrogen fixation remained unaffected in nitrogen-starved cells of Anabaena cylindrica . In normal cells under the same conditions nitrogen fixation was about 50 % inhibited by CMU . These data suggest, first, that nitrogen fixation in this organism is independent of reducing potential generated by non-cyclic photo-electron transport and, secondly, that nitrogen fixation is stimulated by photosynthetically produced carbon skeletons to assimilate the fixed nitrogen. Although nitrogen fixation occurred to a limited extent in the dark, increasing light intensity stimulated nitrogen fixation both in the presence and absence of CMU . This suggests that light-generated ATP is required for nitrogen fixation in this alga. A ratio of pyruvate decarboxylation to nitrogen fixation of 3:1 has been established for A. cylindrica . This accords with the hypothesis that pyruvate acts as a hydrogen donor for nitrogen reduction and that provision of the required reductant is independent of photosynthesis in blue-green algae.

scholarly journals Pigmentation of an Ostracod, Heterocypris Incongruens

1959 ◽  
Vol 36 (3) ◽  
pp. 575-582
Author(s):  
J. GREEN
Keyword(s):  
Green Algae ◽  
Green Alga ◽  
The Body ◽  
Blue Green Alga ◽  
Anaerobic Conditions ◽  
Blue Green Algae ◽  
Intermediate Metabolism ◽  
Different Types ◽  
Β Carotene ◽  
Heterocypris Incongruens

1. Heterocypris incongruens contains at least three different types of pigment: carotenoids, a pteridine, and a bilin. Haemoglobin and other haem pigments appear to be lacking in this species. 2. Astaxanthin and β-carotene are the only carotenoids found, even when the ostracod is feeding on algae containing abundant xanthophylls of various types. 3. A yellow pteridine, which rapidily decolorizes after extraction, is widespread in the body of the ostracod, but not in its eggs. It is suggested that this substance may play a part in the intermediate metabolism of the ostracod when in anaerobic conditions. Heterocypris can live and reproduce in anaerobic conditions for at least 2 weeks. 4. Biladiene pigments accumulate in the gut wall when the ostracod feeds on blue-green algae. These pigments can be made to disappear from the gut wall by restricting the diet to green algae, then made to reappear when a blue-green alga is given as food.

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