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Antimicrobial activities of polyether compounds of dinoflagellate origins (1990)

Nagai, Hiroshi ; Satake, Masayuki ; Yasumoto, Takeshi

Springer

Journal of applied phycology 2 (1990), S. 305-308

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ISSN: 1573-5176

Keywords: polyether ; antimicrobial activity ; dinoflagellate ; antifungals ; chemical modification

Source: Springer Online Journal Archives 1860-2000

Topics: Biology

Notes: Abstract Twelve polyether compounds originating from dinoflagellates were tested for growth-inhibiting activities againstAspergillus niger, Penicillium funiculosum, Candida rugosa, Escherichia coli, Bacillus megaterium andStaphylococcus aureus by a paper disc method. These polyethers represent six groups of different skeletons and originate from three species;Prorocentrum lima, Dinophysis fortii andGambierdiscus toxicus. Potent antifungal activities were observed with okadaic acid and its two congeners, desulfated yessotoxin, and ciguatoxin but not with okadaic acid esters, prorocentrolide, pectenotoxin-1, yessotoxin, maitotoxin, and desulphated maitotoxin. The antifungal activities and mouse lethalities of the polyethers were markedly affected by slight modification of their structures. Antibacterial potency of the tested compounds was not significant.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF02180919

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Introduction of 2-methoxycarbonylallyl end group by copolymerization of methyl α-(phenoxymethyl)acrylate accompanying with addition-fragmentation reaction (1993)

Yamada, Bunichiro ; Kobatake, Seiya ; Satake, Masayuki ; [et al.]

Bognor Regis [u.a.] : Wiley-Blackwell

Journal of Polymer Science Part A: Polymer Chemistry 31 (1993), S. 1551-1559

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ISSN: 0887-624X

Keywords: radical copolymerization ; α-(phenoxymethyl)acrylate ; addition-fragmentation reaction ; unsaturated end group ; 1,1-disubstituted ethylene ; Chemistry ; Polymer and Materials Science

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: Copolymerizations of methyl α-(phenoxymethyl)acrylate (MPMA) with methyl acrylate, methyl methacrylate, styrene, and methyl α-ethylacrylate were carried out. Addition of a polymer radical to MPMA followed by the subsequent fragmentation of poly(MPMA) radical resulted in the 2-methoxycarbonylallyl end group and phenoxy radical in the course of the copolymerization. The extent of the fragmentation determined by 1H-NMR spectroscopy depends on reactivity of the MPMA radical toward the reference monomers. An increase in the addition rate of the MPMA radical to the reference monomer brought about suppression of the fragmentation. The addition of the MPMA radical to styrene seems to be sufficiently fast to prevent the fragmentation. Since the rate of the fragmentation relative to the propagation was considerably accelerated by raising the temperature to 110°C, MPMA can be used as a novel chain transfer agent to control molecular weight and end group at a temperature above 100°C. © 1993 John Wiley & Sons, Inc.

Additional Material: 6 Ill.