The effect of heavy metals on photosynthesis and loss of cell potassium in two species of marine algae, Dunaliella tertiolecta and Phaeodactylum tricornutum

1974 ◽  
Vol 29 (1) ◽  
pp. 99-103 ◽  
Author(s):  
J. Overnell
Keyword(s):  
Heavy Metals ◽  
Phaeodactylum Tricornutum ◽  
Marine Algae ◽  
Dunaliella Tertiolecta

Observations on moulting in Antarctic Krill (Euphausia superba Dana)

1982 ◽  
Vol 33 (1) ◽  
pp. 71 ◽  
Author(s):  
T Ikeda ◽  
P Dixon
Keyword(s):  
Phaeodactylum Tricornutum ◽  
Antarctic Krill ◽  
Dry Weight ◽  
Euphausia Superba ◽  
Dunaliella Tertiolecta ◽  
Antarctic Ocean ◽  
Fish Food ◽  
Antarctic Waters ◽  
The Antarctic ◽  
Antarctic Krill Euphausia Superba

Live E. superba were transported from Antarctic waters to a tropical laboratory where observations at the temperature of -0.5�C (0 to - 1.0�C), were made of intermoult period of specimens fed a mixture of microalgae (Dunaliella tertiolecta and Phaeodactylum tricornutum) or artificial pet fish food or starved. Mean intermoult period was 26.4-27.1 days for fed specimens and 29.6 days for starved specimens, with no relation to the size of specimens. The moult accounted for a loss of 2.63-4.35% of animal dry weight, which is equivalent to 1.1-1.8% of animal nitrogen or 1.4-2.3% of animal carbon. The contribution of moults to detritus in the Antarctic Ocean was estimated as 0.11 g C m-2 per year.

Contents of heavy metals in marine algae from Egyptian Red Sea coast

2006 ◽  
Vol 88 (1) ◽  
pp. 9-22 ◽  
Author(s):  
Aly Mohammed A. Abdallah ◽  
Maha Ahmed Abdallah ◽  
Aly Beltagy ◽  
Eman Siam
Keyword(s):  
Heavy Metals ◽  
Red Sea ◽  
Marine Algae ◽  
Red Sea Coast ◽  
Sea Coast

Toxic effects of ZnO nanoparticles towards marine algae Dunaliella tertiolecta

2013 ◽  
Vol 445-446 ◽  
pp. 371-376 ◽  
Author(s):  
Sonia Manzo ◽  
Maria Lucia Miglietta ◽  
Gabriella Rametta ◽  
Silvia Buono ◽  
Girolamo Di Francia
Keyword(s):  
Zno Nanoparticles ◽  
Marine Algae ◽  
Dunaliella Tertiolecta ◽  
Toxic Effects

Depression of Carbohydrate in Marine Algae by Urea Herbicides

Weed Science ◽  
1971 ◽  
Vol 19 (5) ◽  
pp. 568-570 ◽  
Author(s):  
Gerald E. Walsh ◽  
Thomas E. Grow
Keyword(s):  
Marine Algae ◽  
Isochrysis Galbana ◽  
Carbohydrate Content ◽  
Dunaliella Tertiolecta ◽  
Unicellular Algae ◽  
Representative Species ◽  
Unialgal Culture

Representative species of six genera of marine unicellular algae (Chlorococcumsp.,Dicrateria inornataParke,Dunaliella tertiolectaButcher,Nannochlorissp.,Isochrysis galbanaParke, andMonochrysis lutheriDroop) were treated in unialgal culture with 3-(3,4-dichlorophenyl)-1,1-dimethylurea (diuron), 1-butyl-3-(3,4-dichlorophenyl)-1-methylurea (neburon), 3-(p-chlorophenyl)-1,1-dimethylurea (monuron), and 1,1-dimethyl-3-phenylurea (fenuron). Tests were conducted at salinities of 5, 10, 20, and 30 parts per thousand (ppt). The herbicides depressed concentration of carbohydrate in all species.Dunaliella tertiolectawas most resistant; its carbohydrate content decreased 9.2% at 5 ppt salinity and 17.9% at 30 ppt.Chlorococcumwas most susceptible; its carbohydrate content decreased 49.1% at 5 ppt and 65.6% at 30 ppt salinity.

The pigments of Artemia

1960 ◽  
Vol 152 (946) ◽  
pp. 118-136 ◽  
Keyword(s):  
Brine Shrimp ◽  
Phaeodactylum Tricornutum ◽  
Artemia Salina ◽  
Dunaliella Tertiolecta ◽  
Carotenoid Pigment ◽  
Algal Food ◽  
Feeding Experiments ◽  
Unicellular Algae ◽  
Bright Orange ◽  
Egg Shells

The eggs of the brine shrimp, Artemia salina , vary in colour from pale cream to dark brown. This variation is due to different amounts of haematin in the egg shells. Nauplii of Artemia are bright orange in colour owing to a carotenoid pigment, esterified astaxanthin. The same carotenoid is present in the eggs. Adult Artemia which has been reared on bakers’ yeast, in which we found no carotenoids, contains only a small amount of astaxanthin ester, presumably derived from that present in the egg. The carotenoids of the unicellular algae Dunaliella tertiolecta and Phaeodactylum tricornutum have been examined as a preliminary to feeding experiments with Artemia . The carotenoids identified from Dunaliella were β -carotene, γ -carotene, a carotene oxide, lutein, violaxanthin, and neoxanthin; those from Phaeodactylum were β -carotene, diadinoxanthin, fucoxanthin and neofucoxanthin. Adult Artemia reared on Dunaliella retains varying amounts of all the algal carotenoids, and in addition changes some of them to astaxanthin which becomes esterified and is quantitatively the most abundant carotenoid in the animal. A keto-carotenoid has been found in Artemia examined soon after being fed on Dunaliella . Artemia fed on Phaeodactylum retains all the algal xanthophylls to some extent. No β -carotene was found in the animals; a large amount of a keto-carotenoid was found, as well as astaxanthin. There is evidence that β -carotene in the algal food is the precursor of astaxanthin found in the adult Artemia and that the transformation proceeds through the keto-carotenoids.

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