Browsing Scholarly literature by Author "Wahidullah, S."
Now showing items 41-58 of 58
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Metabolites from marine fungus Aspergillus sp.
Wahidullah, S.; Rajmanickam, R.; DeSouza, L. (Allied Publishers; New Delhi (India), 2002)Chemical examination of a methanolic extract of the marine fungus, Aspergillus sp., isolated from marine grass environment, yielded a steroid, ergosterol peroxide (1), and a mixture of known glyceride esters (2,3) of ... -
New bromotriterpene polyethers from the Indian alga Chondria armata
Ciavatta, M.L.; Wahidullah, S.; DeSouza, L.; Scognamiglio, G.; Cimino, G. (Pergamon, 2001)Six new bromotriterpene polyethers, armatol A-F (1-6), with a rearranged carbon skeleton, were isolated from the Indian Ocean red alga Chondria armata. The structures were characterized by spectroscopic techniques, in ... -
New bromotyrosine alkaloids from the marine sponge Psammaplysilla purpurea
Tilvi, S.; Rodrigues, C.; Naik, C.G.; Parameswaran, P.S.; Wahidullah, S. (Elsevier, 2004)Seven new bromotyrosine alkaloids Purpurealidin A, B, C, D, F, G, H and the known compounds Purealidin Q, Purpurealidin E, 16-Debromoaplysamine-4 and Purpuramine I have been isolated from the marine sponge Psammaplysilla ... -
New C sub(21) Delta sup(20) pregnanes, inhibitors of mitochondrial respiratory chain,from Indopacific octocoral Carijoa sp.
Ciavatta, M.L.; Gresa, M.P.L.; Manzo, E.; Gavagnin, M.; Wahidullah, S.; Cimino, G. (Elsevier, 2004)Two new compounds, pregnanes 1 and 2, the known pregnane 3 and a series of known chlorinated prostanoids (4-9) have been isolated from the Indian octocoral Carijoa sp. Their structures have been elucidated by spectroscopic ... -
New gamma-pyrone propionates from the Indian Ocean sacoglossam Placobranchus ocellatus
Manzo, E.; Ciavatta, M.L.; Gavagnin, M.; Mollo, E.; Wahidullah, S.; Cimino, G. (Tetrahedron letters, 2005)A new gamma-pyrone propionate, compound 9, and its peroxy derivative 10 have been isolated from the sacoglossan Placobranchus ocellatus. The structure and the relative stereochemistry of the new molecules, which displayed ... -
Oxytocic principle of Red alga Amphiroa fragilissima
Wahidullah, S.; DeSouza, L.; Das, B.; Patnaik, G.K. (Walter de Gruyter, Berlin, 1987)The crude aqueous methanolic extract of the marine red alga @iAmphiroa fragilissima@@ has been reported as exhibiting oxytocic and spasmogenic activity at a dose of 50 ~kg/ml. The activity is located in the water soluble ... -
Phthalate esters from the brown alga Stoechospermum marginatum (C. Agardh) Kuetzing
Wahidullah, S.; DeSouza, L. (Walter de Gruyter, Berlin, 1995) -
Phytochemical profiles and antioxidant potential of four Arctic vascular plants from Svalbard
Singh, P.; Singh, S.M.; DeSouza, L.; Wahidullah, S. (Springer-Verlag, 2012)Environmental stress in the Arctic region leads to damage in plant membranes as a result of oxidation processes. To withstand these stress conditions, plants are expected to produce antioxidants that differ from phenolics. ... -
Reaction of Elemol with Acetic acid –Perchloric acid: Characterization of a novel oxide and (+)-β-cyperone
Wahidullah, S.; Govenkar, M.B.; Paknikar, S.K. (Springer-Verlag, 2006)The minor unidentified compounds of acetic acid- perchloric acid dehydration of elemol (1) have been fully characterized. The structure and relative stereochemistry as shown in (2) of the less polar fragrant compound named ... -
Screening marine organisms for antimicrobial activity against clinical pathogens
PrabhaDevi; Wahidullah, S.; Tonima, K.; DeSouza, L. (NISCAIR (CSIR), 2011)Bacterial resistance to existing antibiotics has led to the search for new therapeutic agents. With this aim, we have evaluated antimicrobial activity of extracts prepared from forty species of marine organisms belonging ... -
Seasonal changes in biochemical composition of Holothuria leucospilota (Echinodermata)
Jayasree, V.; Parulekar, A.H.; Wahidullah, S.; Kamat, S.Y. (CSIR-NISCAIR, 1994)Biochemical composition of body wall and gonads of Holothuria leucospilota was analysed for protein, carbohydrate, lipid, ash, dry weight and calorific values and was discussed in relation to its spawning activities. Lipids ... -
Selected chemo-ecological studies of marine opisthobranchs from Indian coasts
Fontana, A.; Ciavatta, M.L.; DeSouza, L.; Mollo, E.; Naik, C.G.; Parameswaran, P.S.; Wahidullah, S.; Cimino, G. (Indian Institute of Science, 2001)The report on chemical and ecological studies of benthic marine invertebrates from the southern coast of the Indian peninsula is summarised. In particular, the paper is centred on the chemical investigations of opisthobranch ... -
Steroids from marine sponges Suberites vestigium and Chrotella australiensis
Mishra, P.D.; Wahidullah, S.; DeSouza, L.; Kamat, S.Y. (NISCAIR, CSIR, 1997)The sponges Suberites vestigium and Chrotella australiensis have been examined for steriods. Both the sponges contain C sub(27-29) mono and diunsaturated sterols, in addition sponge C. australiensis contains cholest-4-ene-3-one ... -
Structural characteristics of marine sedimentary humic acids by CP/MAS sup(13)C NMR spectroscopy
Sardessai, S.; Wahidullah, S. (Ifremer/ CNRS/ IRD/ Editions scientifiques et medicales Elsevier SAS. Tous droits reserves, 1998)Humic acids from sediments of different depositional environments have been studied by solid-state sup(13)C NMR and the results compared with the traditional wet chemical analysis. Results obtained are well in agreement ... -
Studies on the fatty acids of the red alga Chondria armata (Kutz.) okamura
Govenkar, M.B.; Wahidullah, S. (Walter de Gruyter, Berlin, 1999)The alga, Chondria armata, collected from Goa Coast, India has been studied for its fatty acid composition. The analysis of fatty acid methyl esters by GC-MS (gas chromatography-mass spectrometry) revealed the presnece of ... -
Synthesis of 2,3-dimethoxy-p-cymene
Wahidullah, S.; Paknikar, S.K. (CSIR-NISCAIR, 1987) -
The sponge-associated bacterium Bacillus licheniformis SAB1: A source of antimicrobial compounds
PrabhaDevi; Wahidullah, S.; Rodrigues, C.; DeSouza, L. (Molecular Diversity Preservation International, 2010)Several bacterial cultures were isolated from sponge Halichondria sp., collected from the Gujarat coast of the Indo Pacific region. These bacterial cultures were fermented in the laboratory (100 mL) and the culture filtrate ... -
Volvatellin, caulerpenyne-related product fromt he sacoglossan Volvatella sp.
Fontana, A.; Ciavatta, M.L.; Mollo, E.; Naik, C.G.; Wahidullah, S.; DeSouza, L.; Cimino, G. (American Chemical Society, 1999)Volvatellin (4) is a highly unstable terpene isolated from the extracts of the Indian opisthobranch mollusk Volvatella sp. The structure and the relative stereochemistry of 4 were determined by NMR methods. The paper also ...