Arsenolipid biosynthesis by the unicellular alga Dunaliella tertiolecta is influenced by As/P ratio in culture experiments

Metallomics ◽  
2018 ◽  
Vol 10 (1) ◽  
pp. 145-153 ◽  
Author(s):  
Ronald A. Glabonjat ◽  
Josef Ehgartner ◽  
Elliott G. Duncan ◽  
Georg Raber ◽  
Kenneth B. Jensen ◽  
...  
Keyword(s):  
Dunaliella Tertiolecta ◽  
Water Soluble ◽  
Unicellular Alga ◽  
Unicellular Algae

Culture experiments exposing unicellular algae to varying arsenate/phosphate regimes and determining their arsenometallomes by HPLC–MS shows the interconnection of arsenolipids and water-soluble arsenicals.

scholarly journals Intermediates of tocopherol biosynthesis in the unicellular alga Scenedesmus obliquus. The presence of three isomeric methylphytylbenzoquinones

1987 ◽  
Vol 242 (2) ◽  
pp. 367-373 ◽  
Author(s):  
A Henry ◽  
R Powls ◽  
J F Pennock
Keyword(s):  
Carbon Atom ◽  
Hydroxy Group ◽  
Scenedesmus Obliquus ◽  
Alpha Tocopherol ◽  
Unicellular Alga ◽  
Unicellular Algae

Three isomers of methylphytylbenzoquinone have been isolated from lipids of the unicellular alga Scenedesmus obliquus, the most abundant being 2-methyl-6-phytylbenzoquinone (65% of the total). The 2-methyl-3-phytyl and 2-methyl-5-phytyl isomers amounted to 8 and 27% respectively. Previously problems have been encountered in the separation of the 3-phytyl and the 6-phytyl isomers, but in the present study it was found that they separated readily as quinols. Phytyl plastoquinone was also found and the relevance of these compounds to the biosynthesis of alpha-tocopherol is discussed. As well as phylloquinone, a hydroxyphylloquinone was detected, and studies indicated that it is the 5′ carbon atom to which the hydroxy group is attached. Such a compound has been found by workers using other unicellular algae.

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.

scholarly journals Alien domains shaped the modular structure of plant NLR proteins

2019 ◽  
Author(s):  
Giuseppe Andolfo ◽  
Antimo Di Donato ◽  
Pasquale Chiaiese ◽  
Antonino De Natale ◽  
Antonino Pollio ◽  
...  
Keyword(s):  
Innate Immunity ◽  
Cell Surface ◽  
Surveillance System ◽  
Genomic Structure ◽  
Defense Responses ◽  
Leucine Rich Repeat ◽  
Unicellular Alga ◽  
Unicellular Algae ◽  
A Cell ◽  
Chromochloris Zofingiensis

Abstract Plant innate immunity mostly relies on nucleotide-binding (NB) and leucine-rich repeat (LRR) intracellular receptors to detect pathogen-derived molecules and to induce defense responses. A multi-taxa reconstruction of NB-domain associations allowed us to identify the first NB-LRR arrangement in the Chlorophyta division of the Viridiplantae. Our analysis points out that the basic NOD-like receptor (NLR) unit emerged in Chlorophytes by horizontal transfer and its diversification started from TIR-NB-LRR (TNL) members. The operon-based genomic structure of Chromochloris zofingiensis NLR copies suggests a functional origin of NLR clusters. Moreover, the transmembrane signatures of NLR proteins in the unicellular alga C. zofingiensis supports the hypothesis that the NLR-based immunity system of plants derives from a cell-surface surveillance system. Taken together, our findings suggest that NLRs originated in unicellular algae and may have a common origin with cell surface LRR receptors.

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.

Effects of the water-soluble fraction of the mixture fuel oil/diesel on the microalgae Dunaliella tertiolecta through growth

2020 ◽  
Vol 27 (28) ◽  
pp. 35148-35160
Author(s):  
Soledad Salinas-Whittaker ◽  
Claudia M. Gómez-Gutiérrez ◽  
Beatriz Cordero-Esquivel ◽  
Priscy A. Luque ◽  
Graciela Guerra-Rivas
Keyword(s):  
Soluble Fraction ◽  
Dunaliella Tertiolecta ◽  
Water Soluble ◽  
Fuel Oil ◽  
Water Soluble Fraction

scholarly journals Effects of Burkholderia thailandensis rhamnolipids on the unicellular algae Dunaliella tertiolecta

2019 ◽  
Vol 182 ◽  
pp. 109413 ◽  
Author(s):  
Nikolina Charalampous ◽  
Giorgos Grammatikopoulos ◽  
Constantina Kourmentza ◽  
Michael Kornaros ◽  
Stefanos Dailianis
Keyword(s):  
Dunaliella Tertiolecta ◽  
Burkholderia Thailandensis ◽  
Unicellular Algae

Bioactive Compounds isolated from Defatted Microalgal Biomasses of Botryococcus braunii and Dunaliella tertiolecta Showing a Tyrosinase Inhibitory Activity

2020 ◽  
Vol 16 ◽  
Author(s):  
Da Gyung Lee ◽  
Shaheen Amna Kashif ◽  
Ah Young Yoo ◽  
Ji Won Choi ◽  
Yong Il Park ◽  
...  
Keyword(s):  
Bioactive Compounds ◽  
Inhibitory Activity ◽  
Biological Activities ◽  
Compositional Analysis ◽  
Structural Difference ◽  
Botryococcus Braunii ◽  
Biochemical Properties ◽  
Dunaliella Tertiolecta ◽  
Water Soluble ◽  
Tyrosinase Inhibitory Activity

Aims: This study aims to elucidate the structural difference and biochemical properties of bioactive compounds of microalgal biomasses. Background : The structural difference and biochemical properties of bioactive compounds termed as water-soluble macromolecules (WSMs) are interested in evaluating their biological activities. Methods: This study was performed to elucidate the structural difference and biochemical properties of bioactive compounds termed as water-soluble macromolecules (WSMs) isolated from defatted microalgal biomasses of Botryococcus braunii and Dunaliella tertiolecta. Results: The compositional analysis of both WSMs revealed that WSM-Bb is a hetero-macromolecule consisting of various monosaccharides, whereas WSM-Dt was characterized as a homo-macromolecule that mainly consists of glucose. Interestingly, WSM-Bb showed the significant tyrosinase inhibitory activity with the increase of both the concentration and reaction time. Whereas, there was no significant inhibitory activity observed by WSM-Dt. Conclusion: Inhibitory action of WSM-Bb toward both tyrosinase and tyrosine in the either simultaneous or separate reaction may be mainly due to the physical affinity of WSM-Bb. These results emphasize the identification of the primary components of these WSMs and their relevance with the antioxidant function.

STRESS RESPONSES IN PIGMENTED BACILLUS PUMILUS SF14

2017 ◽  
Vol 79 (5) ◽  
Author(s):  
Saad Sabah Fakhry ◽  
Manal Abdalteef Hasan ◽  
Saba Talib Hashim ◽  
Zahraa Abbas Jebur ◽  
Farqad Farhan Abdulhameed
Keyword(s):  
Stress Responses ◽  
Bacillus Pumilus ◽  
Biochemical Properties ◽  
Culture Collection ◽  
Water Soluble ◽  
Microbial Culture ◽  
Color Development ◽  
Unicellular Algae ◽  
Sporulation Efficiency ◽  
Mutant Strains

Microbial producers of carotenoids belongs to a various species of unicellular algae, filamentous fungi and several bacteria. A recent report has shown that up to 15% of aerobic spore-formers identified from soil samples are pigmented and in many cases the pigments are carotenoids. Pigmented spore-forming Bacillus was obtained from culture maintained in the microbial culture collection of Department of Structural Functional Biol. University of Naples Federico II and partially characterized their pigments. A classical mutagenesis approach has been used to obtain mutant strains producing altered pigments or no pigments. Our results suggest that pigmentation in spore’s represent an additional, and may be alternative protection strategy against oxidative stress. A mutants (SF214-M1, SF214-M2, SF214-M3 and SF214-M4) of Bacillus pumilus strain SF214 producing a carotenoids water soluble-pigment were obtained after treatment with the mutagenic agent N-Methyl-N-nitroso-N'-nitroguanidine (NTG). Several microbiological and biochemical properties of these 4 strains were analyzed and the results were differences between wild type and other four mutants in producing pigments, color changing, sporulation, cannot produce spores after mutation and sporulation efficiency was constant with color development.

scholarly journals Marine and freshwater micropearls: biomineralization producing strontium-rich amorphous calcium carbonate inclusions is widespread in the genus <i>Tetraselmis</i> (Chlorophyta)

2018 ◽  
Vol 15 (21) ◽  
pp. 6591-6605 ◽  
Author(s):  
Agathe Martignier ◽  
Montserrat Filella ◽  
Kilian Pollok ◽  
Michael Melkonian ◽  
Michael Bensimon ◽  
...  
Keyword(s):  
Unicellular Alga ◽  
Amorphous Calcium Carbonate ◽  
Surrounding Water ◽  
Calcium Carbonates ◽  
Mineral Inclusions ◽  
Biomineralization Process ◽  
Unicellular Algae ◽  
Carbon Pump ◽  
Definite Pattern ◽  
Widespread Phenomenon

Abstract. Unicellular algae play important roles in the biogeochemical cycles of numerous elements, particularly through the biomineralization capacity of certain species (e.g., coccolithophores greatly contributing to the “organic carbon pump” of the oceans), and unidentified actors of these cycles are still being discovered. This is the case of the unicellular alga Tetraselmis cordiformis (Chlorophyta) that was recently discovered to form intracellular mineral inclusions, called micropearls, which had been previously overlooked. These intracellular inclusions of hydrated amorphous calcium carbonates (ACCs) were first described in Lake Geneva (Switzerland) and are the result of a novel biomineralization process. The genus Tetraselmis includes more than 30 species that have been widely studied since the description of the type species in 1878. The present study shows that many other Tetraselmis species share this biomineralization capacity: 10 species out of the 12 tested contained micropearls, including T. chui, T. convolutae, T. levis, T. subcordiformis, T. suecica and T. tetrathele. Our results indicate that micropearls are not randomly distributed inside the Tetraselmis cells but are located preferentially under the plasma membrane and seem to form a definite pattern, which differs among species. In Tetraselmis cells, the biomineralization process seems to systematically start with a rod-shaped nucleus and results in an enrichment of the micropearls in Sr over Ca (the Sr∕Ca ratio is more than 200 times higher in the micropearls than in the surrounding water or growth medium). This concentrating capacity varies among species and may be of interest for possible bioremediation techniques regarding radioactive 90Sr water pollution. The Tetraselmis species forming micropearls live in various habitats, indicating that this novel biomineralization process takes place in different environments (marine, brackish and freshwater) and is therefore a widespread phenomenon.

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