Browsing Scholarly literature by Author "Naik, C.G."
Now showing items 41-52 of 52
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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 ... -
Sterols from the Lakshadweep sponge, Ircinia ramosa (Killer)
Parameswaran, P.S.; Naik, C.G.; Das, B.; Kamat, S.Y. (CSIR-NISCAIR, 1989)Four monohydroxy sterols, viz, (22E,24S)-24-methylcholest-5,22-dien-3(beta)-ol (3), cholesterol (4), 24(Xi)-ethylcholesterol (8) and the corresponding Delta super(4)-3 ketones, viz. (22E,24S)-24-methylcholest-4,22-dien-3-one ... -
Sterols from the soft coral Lobophytum strictum (Alcyonarian) from Lakshadweep sea
Parameswaran, P.S.; Naik, C.G.; Das, B.; Kamat, S.Y. (CSIR-NISCAIR, 1989)Two polyhydroxy sterols 24(Xi)-methylcholestane-3(beta), 5a, 6(beta), 25-tetrol, 25-monoacetate, and 24S-methylcholestane-3(beta), 4(beta), 5(beta), 25-tetrol-6-one, 25-monoacetate (lo-bosterol), six monohydroxy sterols ... -
Structural studies and antimicrobial properties of norcembrane diterpenoid from an Indian soft coral Sinularia inelegans Tixier-Durivault
Singh, K.S.; Kaminsky, W.H.; Rodrigues, C.; Naik, C.G. (Indian Academy of Sciences, 2009)Two metabolites featuring norcembranoid diterpene skeleton have been isolated from chloroform extract of soft coral of the genus sinularia, which was collected from the southern coast of India. The structures of the ... -
Studies on the secondary metabolites from the Indian gorgonian Subergorgia suberosa: Isolation and characterization of four analogues of the cardiotoxin subergorgic acid
Parameswaran, P.S.; Naik, C.G.; Kamat, S.Y.; Puar, M.S.; Das, Pradip; Hegde, V.R. (American Chemical Society, 1998)Chemical investigation of the methanol extract of the Indian Ocean gorgonian coral Subergorgia suberosa resulted in isolation and identification of four novel compounds 2-5. Structural investigation revealed compound 1 to ... -
Synthesis of 5'-bromo-2'-hydroxy-4,4',6'-trimethoxychalcone from Garcinia nervosa and of its isomer 3'-bromo-2'-hydroxy-4,4',6'- trimethoxychalcone
Parab, S.J.; Kapdi, S.G.; Naik, C.G.; Kamat, S.P. (Science & Technology Letters, 2010)The unambiguous syntheses of the naturally occurring 5'-bromo-2'-hydroxy-4,4',6'-trimethoxychalcone 1, a constituent of Garcinia nervosa, and its positional isomer 3'-bromo-2'-hydroxy-4,4',6'-trimethoxychalcone 6 are described -
Tandem mass spectrometry of kahalalides: Identification of two new cyclic depsipeptides, kahalalide R and S from Elysia grandifolia
Tilvi, S.; Naik, C.G. (John Wiley, 2007)Spectra obtained using electrospray ionization mass spectrometry (ESI-MS) of mollusk Elysia grandifolia showed a cluster of molecular ion peaks centered at a molecular mass of 1478 Da (kahalalide F, an anticancer agent). ... -
Two bromotyrosine alkaloids from the sponge Psammaplysilla purpurea
Tilvi, S.; Parameswaran, P.S.; Naik, C.G. (Allied Publishers; New Delhi (India), 2002)The sponge Psammaplysilla purpurea (Order: Verongidae, Family: Aplysinellidae) is a well known source for several bromotyrosine alkaloids of unique structural features and exhibiting promising biological activities such ... -
Two selective novel triterpene glycosides from sea cucumber, Telenata ananas: Inhibitors of chemokine receptor-5
Hegde, V.R.; Chan, T.-M.; Pu, H.; Gullo, V.P.; Patel, M.G.; Das, P.; Wagner, N.; Parameswaran, P.S.; Naik, C.G. (Pergamon, 2002)The aqueous methanolic extract of a sea cucumber was found to contain two triterpene glycosides 1 and 2. The structures of 1 and 2 were established based on high-resolution NMR studies. Compounds 1 and 2 exhibited inhibitory ... -
Two simple amine hydrochlorides from the soft coral Lobophytum strictum
Parameswaran, P.S.; Naik, C.G.; Das, B.; Kamat, S.Y. (NISCAIR, New Delhi, 1991)Two simple amine hydrochlorides, viz., 1-amino-1, 1-dimethyl-3-oxo-butane hydrochloride (1) (Diacetonamine) and 2, 2, 6, 6-tetramethylpiperidone hydrochloride (2) have been isolated from the fraction of the methanolic ... -
Use of Fourier Transform Infrared (FTIR) spectroscopy to study cadmium-induced changes in Padina tetrastromatica (Hauck)
DeSouza, L.; PrabhaDevi; DivyaShridhar, M.P.; Naik, C.G. (Libertas Academica, 2008)The aim of this study is to adopt the approach of metabolic fingerprinting through the use of Fourier Transform Infrared (FTIR) technique to understand changes in the chemical structure in Padina tetrastromatica (Hauck). ... -
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 ...