Characteristics of nitrogenase activity in broken cell preparations of the blue-green alga Gloeocapsa sp. LB 795

1972 ◽  
Vol 18 (3) ◽  
pp. 327-332 ◽  
Author(s):  
J. R. Gallon ◽  
T. A. Larue ◽  
W. G. W. Kurz
Keyword(s):  
Adenosine Triphosphate ◽  
Green Algae ◽  
Green Alga ◽  
Enzyme System ◽  
Nitrogenase Activity ◽  
Adenosine Diphosphate ◽  
Sodium Dithionite ◽  
Kinetic Properties ◽  
Blue Green Alga ◽  
Blue Green Algae

Broken cell preparations of the blue-green alga Gloeocapsa sp. LB 795 reduce acetylene to ethylene and evolve hydrogen in the presence of sodium dithionite and adenosine triphosphate (ATP). The enzyme system is almost completely inhibited by adenosine diphosphate (ADP) (7.5 mM), O2 and CO (0.01 atm), and CO2 (0.05 atm). Its kinetic properties are very similar to those of nitrogenases from other sources, but, unlike the enzymes so far isolated from other blue-green algae, Gloeocapsa nitrogenase is sedimented by centrifugation at 10 000 g.

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.

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.

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.

Discussion on the preceding papers

1967 ◽  
Vol 252 (777) ◽  
pp. 385-389
Keyword(s):  
Particle Size ◽  
Green Algae ◽  
Green Alga ◽  
Slight Modification ◽  
Blue Green Alga ◽  
Blue Green Algae ◽  
Signy Island ◽  
Filter Feeders ◽  
Calm Weather

J. E. Smith. The Anostraca, following the classic studies of Cannon & Manton, are commonly regarded as filter feeders, yet there is evidence that some, including Branchinecta on Signy Island, feed on the bottom. What mechanism is involved and what kind of food is being taken ? R. B. Heywood. In calm weather few Branchinecta giani are visible at the surface, or in mid-water in the Signy Island lakes. They all seem to be browsing on the benthic felts of blue/green algae. The thoracic appendages show slight modification for scraping and Dr Ralph has observed this process in the laboratory. Large masses of blue/green alga are common in the fore-gut of the animals, and we can only conclude that they are general and detritus feeders whose diet is limited largely by particle size. Large pieces of crustacean exoskeleton have been seen in some specimens but these were without musculature and were probably taken in with detritus rather than as the result of predation.

Production de vitamine B12 par une algue bleue

1978 ◽  
Vol 24 (12) ◽  
pp. 1562-1566 ◽  
Author(s):  
E. Grieco ◽  
R. Desrochers
Keyword(s):  
Green Algae ◽  
Green Alga ◽  
Vitamin B ◽  
Blue Green Alga ◽  
Ecological Significance ◽  
Blue Green Algae ◽  
Vitamine B12 ◽  
Axenic Cultures

In this study, we have been able to demonstrate the production and liberation of vitamin B12 (up to 16.5 pg/ml after 31 days of growth) by a blue green alga, Anabaena flos-aquae, in non-axenic and axenic cultures. This finding has a relevant ecological significance since it shows that, like bacteria, blue green algae may play a role as producers of vitamin B12.

Fine structure of the thermophilic blue-green alga Synechococcus lividus Copeland. A study of frozen–fractured–etched cells

1972 ◽  
Vol 18 (2) ◽  
pp. 175-181 ◽  
Author(s):  
S. C. Holt ◽  
M. R. Edwards
Keyword(s):  
Green Alga ◽  
Lipid Bodies ◽  
Blue Green Alga ◽  
Etching Technique ◽  
Thin Sections ◽  
Blue Green Algae ◽  
Osmiophilic Granules ◽  
Freeze Etching ◽  
The Many ◽  
Synechococcus Lividus

The thermophilic unicellular blue-green alga, Synechococcus lividus, was studied by electron microscopy in thin sections and by the freeze-etching technique. Thin sections revealed subcellular structures like those observed by other authors in mesophilic blue-green algae. In the freeze-etched fractures similar results were obtained but, in addition, surface views of plasma and thylakoidal membranes were examined in detail. The many inclusions present in the freeze-etched preparations confirmed those displayed in thin sections and are interpreted as polyhedral, polyphosphate, and lipid bodies. Some unidentified osmiophilic granules and also phycobilisomes were seen.

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