Lysa M Foster

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The main cytotoxic component in New Zealand collections of the liverwort Trichocolea mollissima was identified as methyl 4-[(5-oxogeranyl)oxy]-3-methoxybenzoate, a structure that has not been reported previously. Two double-bond isomers of this geranyl ether were present at lower levels. Reinvestigation of the benzoates from Japanese collections of(More)
A new sesquiterpene/quinol, with mild cytotoxic and antibacterial activity, has been isolated from a New Zealand collection of the liverwort Riccardia crassa. The structure of this compound, riccardiphenol C [3], was established by nmr spectroscopy. Closely related compounds previously isolated from a Japanese collection of R. crassa were not detected in(More)
The antitumour activity of a foliage extract of a New Zealand gymnosperm, Libocedrus plumosa, against P388 leukaemia cells was due to β-peltatin 3. Deoxypodophyllotoxin 1 and β-peltatin A-methyl ether 2, P388-active lignans previously reported in L. bidwillii, were found at lower levels. High levels of trans-communic acid 4 and sandaracopimaric acid 5 were(More)
A new glycosidic lactone, (5R,6R)-5-(1-hydroxyethyl)-2(5H)-furanone beta-D-glucopyranoside, has been identified as the principal precursor of (Z)-5-ethylidene-2(5H)-furanone in juvenile foliage of the New Zealand tree Halocarpus biformis. Three related lactone glycosides were isolated in smaller amounts, together with the known phenolic glycosides pyroside,(More)
A total of 86 species of bryophytes, lichens and vascular plants were collected from New Zealand's subantarctic Campbell and Auckland Islands, including 18 subantarctic endemic species. Extracts of these species have been screened for antimicrobial activity and toxicity towards a P388 cell line. Of the main taxonomic groups collected, the proportion of(More)
Clavigerin A ( 1) was isolated from the New Zealand liverwort Lepidolaena clavigera and shown to be a polyoxygenated bergamotane sesquiterpene with an unusual ring system. L. clavigera shows infraspecific variation, since 1 was the only clavigerin detected in a North Island collection, whereas the previously reported clavigerins B ( 2) and C ( 3) were found(More)
Complementary DNA (cDNA) clones encoding two G protein alpha-subunit proteins (CGP alpha 1 and CGP alpha 2) were isolated from a Coprinus congregatus (Cc) hyphal tip cell (HTC) library using PCR-generated biotinylated G protein probes. Sequence analysis of the Cc cgp alpha 1 gene indicates that the gene contains an open reading frame (ORF) that translates(More)