Tropical Marine Algae. IV. Novel Metabolites From the Red Alga Laurencia implicata (Rhodophyta, Rhodophyceae, Ceramiales, Rhodomelaceae)

1989 ◽  
Vol 42 (10) ◽  
pp. 1685 ◽  
Author(s):  
JC Coll ◽  
AD Wright
Keyword(s):  
Chlorine Atom ◽  
High Field ◽  
Marine Algae ◽  
Marine Alga ◽  
Red Alga ◽  
Structural Elucidation ◽  
Hydroxy Derivative

The marine alga Laurencia implicata afforded four new C15-lipid' type metabolites: (3Z,6Z,9Z)-12-bromo-5,13-epoxypentadeca-3,6,9-trien-1-yne (6) with an unprecedented 1-oxacyclodecane ring, (3Z,6Z,92)-13-bromo-5,12-epoxypentadeca-3,6,9-trien-1-yne (7) with a nine-membered ether ring, (3E,6S,7S,9S,10S,12S,13R)-10,12-dibromo-6,9:7,13-bisepoxy-pentadec-3-en-l-yne (8), in which a chlorine atom in the known compound chlorofucin (9) has been replaced by bromine, (1R*,4R*,6S*,7S*)-9-acetoxy-1,10,12-tribromo-4,7:6,13-bisepoxypentadeca-1,2-diene (11) and the closely related known metabolite neolaurallene (10). In addition, a brominated sesquiterpene (1'R*,3′R*)-2-(3?-bromo-1′,2′,2′-trimethylcyclopentyl-5-methylphenol (14), The 2′-hydroxy derivative of α- bromocuparene (15), was identified. Structural elucidation of all metabolites was based on high-field n.m.r. studies and comparison with known metabolites.

Tropical Marine Algae. V. The Structure Determination of Two Novel Sesquiterpenes From the Red Alga Laurencia tenera (Rhodophyceae, Ceramiales, Rhodomelaceae)

1989 ◽  
Vol 42 (10) ◽  
pp. 1695 ◽  
Author(s):  
JC Coll ◽  
BW Skelton ◽  
AH White ◽  
AD Wright
Keyword(s):  
Single Crystal ◽  
Structure Determination ◽  
High Field ◽  
Marine Algae ◽  
Red Alga ◽  
X Ray Diffraction ◽  
X Ray

Laurencia tenera has been shown to contain two novel sesquiterpenes. The structure of the less abundant metabolite (3) was determined by single-crystal X-ray diffraction as (1S,2R,4S,5R,6R,8S,9R)-4,8-dibromo-2,5,6,9-tetramethyltricyclo[7.2.0.01.6] undecane-3-one.‡ The more abundant, but less stable metabolite (4) was investigated by extensive high-field N.M.R. spectroscopy. Its structure is proposed as (1S*,2R*,4R*,5R*,6R*,8R*)-4-bromo-2,5,6-trimethyl-11-methylenetricyclo[6.2.1.01.6]undecan-3-one.§ The sesquiterpene (3) is isomeric with the known metabolite perforatone (5).

scholarly journals MANOMETRIC MEASUREMENTS OF PHOTOSYNTHESIS IN THE MARINE ALGA GIGARTINA

1934 ◽  
Vol 17 (6) ◽  
pp. 817-842 ◽  
Author(s):  
Robert Emerson ◽  
Lowell Green
Keyword(s):  
Marine Algae ◽  
Marine Alga ◽  
Red Alga ◽  
Manometric Method

A manometric method for measuring photosynthesis in marine algae is described. Photosynthesis in the red alga Gigartina harveyana is shown to be similar in all important respects to photosynthesis in Chlorella and other Chlorophyceae.

scholarly journals Antiviral activity of the green marine alga Ulva fasciata on the replication of human metapneumovirus

2010 ◽  
Vol 52 (1) ◽  
pp. 03-10 ◽  
Author(s):  
Gabriella da Silva Mendes ◽  
Angélica Ribeiro Soares ◽  
Fernanda Otaviano Martins ◽  
Maria Carolina Maciel de Albuquerque ◽  
Sonia Soares Costa ◽  
...  
Keyword(s):  
Antiviral Activity ◽  
Viral Entry ◽  
Marine Algae ◽  
Marine Alga ◽  
Biological Properties ◽  
Human Metapneumovirus ◽  
The Other ◽  
Virucidal Activity ◽  
Ulva Fasciata ◽  
Viral Particles

We evaluated the antiviral activity of the marine alga, Ulva fasciata, collected from Rasa beach and Forno beach, Búzios, Rio de Janeiro, Brazil on the replication of human metapneumovirus (HMPV). The algae extracts were prepared using three different methodologies to compare the activity of different groups of chemical composites obtained through these different methodologies. Four out of the six extracts inhibited nearly 100% of viral replication. The results demonstrated that the majority of the extracts (five out of six) possess virucidal activity and therefore have the ability to interact with the extracellular viral particles and prevent the infection. On the other hand, only two extracts (from Forno beach, obtained by maceration and maceration of the decoction) were able to interact with cell receptors, hindering the viral entry. Finally, only the extract of algae collected at Forno beach, obtained by maceration presented intracellular activity. To our knowledge, this is a pioneer study on antiviral activity of marine algae against HMPV. It is also the first on antiviral activity against HMPV ever done in Brazil. The study also shows the effect of different environment factors and different chemical procedures used to obtain the extract on its biological properties.

Tropical Marine-Algae. VI. New Monoterpenes From Several Collections of Chondrococcus hornemannii (Rhodophyta, Gigartinales, Rizophyllidaceae)

1989 ◽  
Vol 42 (11) ◽  
pp. 1983 ◽  
Author(s):  
JC Coll ◽  
AD Wright
Keyword(s):  
Red Algae ◽  
Positional Isomer ◽  
High Field ◽  
Marine Algae ◽  
Circumstantial Evidence ◽  
New Metabolites

Four collections of the red algae Chondrococcus hornemannii( Lyngbye ) Schmitz afforded a range of monoterpenes. Structures of ten new metabolites were elucidated by using high- field n.m.r. spectroscopy techniques including 2.D proton-carbon correlation experiments. The new monoterpenes were: (Z)-3-bromo-8-chloro-6-chloromethyl-2-methylocta-1,6-diene (9,6-hydroxymethyl-2-methylocta-2,8-dien-6-ol (6), (Z)-6-hydroxymethyl-2-methylocta-1,6-diene- 3,8-diol (7), (2)-6-hydroxymethyl-2-methyIocta-2,6-dien-8-ol (8), (2)-8-chloro-6-chloromethyl-3- methoxyocta-1,6-diene (9), (Z)-8-chloso-6-chloromethyl-2-methylocta-l,6-dien-3-ol (10), (2E,62) 8-chloro-6-chloromethyl-1-methoxy-2-methylocta-2,6-diene (11), (2E,6Z)-8-chloro-6-chloromethyl- 2-methylocta-2,6-dien-1-ol (12), (Z)-6-chloromethyl-3,8-dimethoxy-2-methylocta-1,6-diene (13) and its positional isomer (Z)-6-chloromethyl-1,8-dimethoxy-2-methyoca-26-diene (14). Although it is possible that some of the metabolites listed may be artefacts of extraction, circumstantial evidence is offered which suggests that most isolates were present in the plant prior to extraction.

Tropical Marine Algae. I. New Halogenated Monoterpenes From Chondrococcus hornemannii (Rhodophyta, Gigartinales, Rhizophyllidaceae)

1987 ◽  
Vol 40 (11) ◽  
pp. 1893 ◽  
Author(s):  
JC Coll ◽  
AD Wright
Keyword(s):  
Great Barrier Reef ◽  
Marine Algae ◽  
Spectroscopic Studies ◽  
Red Alga ◽  
Barrier Reef ◽  
Halogenated Monoterpenes

Four linear halogenated monoterpenes: (2Z,6E)-1,8-dichloro-3-chloromethyl-7-methylocta- 2,6-diene (1), (E)-1,2-dibromo-3-chloromethylene-7-methyloct-6-ene (2), (Z)-1-chloro-3-chloromethyl-7-methylocta-2,6-diene (3) and (Z)-1,6-dichloro-3-chloromethyl-7-methylocta-2,7- diene (4), and two epimeric bicyclic monoterpenes (2R*,3(8) E,4S*,6R*)-6-bromo-2-chloro-1,4- oxido-3(8)- ochtodene (5) and (2S*,3(8)E,4S*,6R*)-6-bromo-2-chloro-1,4-oxido-3(8)- ochtodene (6) have been isolated from the red alga Chondrococcus hornernannii collected on the Great Barrier Reef, Australia. The structures were assigned on the basis of 1H and 13C n.m.r. spectroscopic studies, and provide another example of the co-occurrence of cyclized and linear halogenated monoterpenes in the same species.

scholarly journals Marine algae of St. Martin's Island, Bangladesh. XII. New records of red and green algae

1970 ◽  
Vol 40 (1) ◽  
pp. 41-45
Author(s):  
Abdul Aziz ◽  
Md Towhidur Rahman
Keyword(s):  
Key Words ◽  
Green Algae ◽  
Marine Algae ◽  
New Records ◽  
Red Alga ◽  
First Time

Ceramium tenerrimum (G. Martens) Okamura fa, Caulerpa sertularioides fa corymbosa Taylor and Cladophora vagabunda (L.) Hoek from St. Martin’s Island, Bangladesh have been recorded, and described and illustrated for the first time with descriptions and illustrations. Key words: Ceramium; Caulerpa; Cladophora; Red alga; Green algae; Bangladesh DOI: http://dx.doi.org/10.3329/bjb.v40i1.7996 Bangladesh J. Bot. 40(1): 41-45, 2011 (June)

Phosphoglycollate Phosphatase in Marine Algae: Isolation and Characterization from Halimeda cylindracea

1976 ◽  
Vol 3 (1) ◽  
pp. 105 ◽  
Author(s):  
DD Randall
Keyword(s):  
Divalent Cation ◽  
Marine Algae ◽  
Marine Alga ◽  
Specific Activity ◽  
Ph Optimum ◽  
Isolation And Characterization

Phosphoglycollate phosphatase was partially purified (107-fold) from the marine alga H. cylindracea. The partially purified enzyme was almost completely specific for phosphoglycollate as substrate, and had the following properties: a specific activity of 2.73, an apparent Km for phosphoglycollate of 8 x 10-4M, a pH optimum of 7.5 - 8 and a divalent cation requirement. The presence of the enzyme is discussed in relation to photorespiration in this alga.

Tropical Marine Algae. IX. A New Sesquiterpenoid Metabolite From the Red Alga Laurencia marianensis

1993 ◽  
Vol 46 (6) ◽  
pp. 933 ◽  
Author(s):  
R Denys ◽  
JC Coll ◽  
BF Bowden
Keyword(s):  
Natural Products ◽  
Marine Algae ◽  
Red Alga ◽  
Natural Products Chemistry ◽  
First Time

An investigation of the natural products chemistry of the red alga Laurencia marianensis Yamada, a species whose chemistry has not previously been described in the literature, yielded the new metabolite 1-[(3′S*,3a′lR*,4′R*,7′S*,7a′S*)-7′-bromo-7a′-methyl-3′-(1′-methylethyl)octahydro-1′H-inden-4′-yl] ethanone (1) and the known metabolites deoxyprepacifenol (2) and pacifenol (3). The full n.m.r. characterization of (2) and (3) is reported for the first time.

Tropical Marine Algae. VIII. The Structural Determination of Novel Sesquiterpenoid Metabolites From the Red Alga .Laurencia majuscula

1992 ◽  
Vol 45 (10) ◽  
pp. 1611 ◽  
Author(s):  
R Denys ◽  
JC Coll ◽  
BF Bowden
Keyword(s):  
Natural Products ◽  
Great Barrier Reef ◽  
Marine Algae ◽  
Structural Type ◽  
Red Alga ◽  
Structural Determination ◽  
Barrier Reef ◽  
Natural Products Chemistry ◽  
Laurencia Majuscula

An investigation of the natural products chemistry of the red alga Laurencia mujuscula from the Great Barrier Reef yielded three novel metabolites, (1), (2) and (3a), possessing a new sesquiterpenoid structural type. Known metabolites (6)-(11) were also isolated and the reassignment of n.m.r. spectral values for (11) is reported.

Sign in / Sign up

Export Citation Format

Share Document