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.

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.

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.

The Structural Determination of a New Steroidal Metabolite from the Brown Alga Sargassum asperifolium

2003 ◽  
Vol 58 (5-6) ◽  
pp. 333-336 ◽  
Author(s):  
Seif-Eldin N. Ayyad ◽  
Salah Z. A Sowellim ◽  
Mohamed S. El-Hosini ◽  
Amal Abo-Atia
Keyword(s):  
Natural Products ◽  
Chemical Transformation ◽  
Red Sea ◽  
Spectral Methods ◽  
Brown Alga ◽  
Structural Determination ◽  
Natural Products Chemistry

Abstract An investigation of the natural products chemistry of the brown alga Sargassum asperifolium from the red sea yielded a new steroidal metabolite, 24-vinyl cholest -4-ene -24- ol -3 one, saringosterone (3), a known steroidal metabolite, 24-vinyl cholest -5-ene -3b, 24-diol, saringosterol (4), and known diterpene with a hydroazulene skeleton, dictyone (1). The identification of the isolated metabolites was established mainly by spectral methods and chemical transformation of the dictyone (1) to its acetate (2).

Determination of Halogenated Natural Products in Passive Samplers Deployed along the Great Barrier Reef, Queensland/Australia

2009 ◽  
Vol 43 (16) ◽  
pp. 6131-6137 ◽  
Author(s):  
Walter Vetter ◽  
Paul Haase-Aschoff ◽  
Natalie Rosenfelder ◽  
Tatiana Komarova ◽  
Jochen F. Mueller
Keyword(s):  
Natural Products ◽  
Great Barrier Reef ◽  
Passive Samplers ◽  
Barrier Reef ◽  
Halogenated Natural Products

Validation of annual growth increments in the Otoliths of two species of Damselfish from the Southern Great Barrier Reef

1992 ◽  
Vol 43 (5) ◽  
pp. 1057 ◽  
Author(s):  
AJ Fowler ◽  
PJ Doherty
Keyword(s):  
Great Barrier Reef ◽  
Direct Determination ◽  
Early Summer ◽  
Barrier Reef ◽  
Annual Basis ◽  
Growth Increments ◽  
Regular Time ◽  
Latitudinal Difference ◽  
Pomacentrus Moluccensis

If the otoliths of fish are to be used as an ageing tool, they must fulfil three criteria: they must display an internal structure of increments, this structure must be relatable to a regular time scale, and the otoliths must grow throughout the lives of the fish at a perceptible rate. These criteria were assessed for two species of damselfish: Pomacentrus moluccensis and P. wardi from One Tree Reef on the southern Great Barrier Reef. Transverse sections of sagittae from both species contained an alternating sequence of opaque and translucent zones that formed an interpretable pattern of increments. Treatment of fish with tetracycline showed that the opaque zones were formed on an annual basis, generally between spring and early summer. The assessment of growth of otoliths from fish treated with tetracycline indicated that those as old as 10 years of age were still laying down increments of regular thickness. Consequently, the otoliths from both species successfully fulfilled the three criteria required for the direct determination of age. Furthermore, this study helped to identify two levels of variation in otolith structure, manifested in the clarity and interpretability of the increments; there was an interspecies difference and a significant intraspecies latitudinal difference.

Cytosporacin (I), a Highly Unsaturated Polyketide: Application of the ACCORD-ADEQUATE Experiment to the Structural Determination of Natural Products.

ChemInform ◽  
2003 ◽  
Vol 34 (49) ◽  
Author(s):  
Haiyin He ◽  
Jeffrey E. Janso ◽  
R. Thomas Williamson ◽  
Hui Y. Yang ◽  
Guy T. Carter
Keyword(s):  
Natural Products ◽  
Structural Determination

Cytosporacin, a Highly Unsaturated Polyketide:  Application of the ACCORD-ADEQUATE Experiment to the Structural Determination of Natural Products

2003 ◽  
Vol 68 (16) ◽  
pp. 6079-6082 ◽  
Author(s):  
Haiyin He ◽  
Jeffrey E. Janso ◽  
R. Thomas Williamson ◽  
Hui Y. Yang ◽  
Guy T. Carter
Keyword(s):  
Natural Products ◽  
Structural Determination
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