John Edward Braggins

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The ether extract of the New Zealand liverwort Radula marginata afforded a new cannabinoid type bibenzyl compound named perrottetinenic acid, and two new bibenzyls, together with a known cannabinoid, perrottetinene. Their structures were established by two dimensional (2D) NMR spectral data. The structure of perrottetinenic acid was a similar to that of(More)
Comparative study shows that Phyllocladus and representative Podocarpaceae differ in the mechanism by which pollen is introduced into the pollen chamber and onto the apex of the nucellus ("pollen capture"). Both types involve a pollination drop, but only in Podocarpaceae is it consistently inverted and in contact with adjacent surfaces. Phyllocladus has(More)
The pollination mechanism of most genera of the Podocarpaceae involves inverted ovules, a pollination drop and bisaccate pollen grains. Saccate grains have sometimes been referred to as 'non-wettable' due to their buoyant properties, while non-saccate pollen grains have been described as 'wettable'. The hydrodynamic properties of saccate pollen grains of(More)
The ether extract of the New Zealand liverwort Tylimanthus tenellus produced three new sesquiterpenes, together with (+)-3,11-eudesmadiene and (-)-4(15),11-eudesmadiene which were enantiomeric to those isolated from higher plants. The structures of the new sesquiterpenes were established by 2D NMR spectral data and/or X-ray crystallographic analysis. Those(More)
Mature, gametangia-bearing photosynthetic gametophytes of Phylloglossum can be grown from the nonphotosynthetic, cylindrical, negatively gravitropic immature stages in illuminated axenic culture on a nutrient medium with or without 0.2% glucose. The gametangial-bearing region of these gametophytes, the photosynthetic crown, grows horizontally from the apex(More)
The volatile components of 25 taxa of the liverwort family Frullaniaceae from New Zealand, Australia and South America have been analyzed by GC-MS. The present Frullania species are chemically divided into five major types: (1) sesquiterpene lactones, (2) sesquiterpene lactones-bibenzyls, (3) bibenzyls, (4) 2-alkanone and (5) triterpene types; the latter(More)
Ether extract of the New Zealand liverwort Hymenophyton flabellatum produced a pungent principle. The structure has been identified as known compound, 1-(2,4,6-trimethoxy-phenyl)-but-2(E)-en-1-one by means of its spectral data, previously isolated from the fern Arachinoides standishii. Further isolation of the extract of this species afforded eight aromatic(More)
The ether extract of the New Zealand liverwort Marsupidium epiphytum gave four new prenyl bibenzyl derivatives, along with a known prenyl bibenzyl derivative which has been isolated from the Ecuadorian liverwort Lethocolea glossophylla; their structures were determined by 2D-NMR spectrum. The chemical constituents of Marsupidium epiphytum are highly(More)
Diethylether extracts of New Zealand liverworts Jamesoniella colorata and Bazzania novae-zelandiae were investigated to reveal novel terpenoids. The former extract afforded a new modified clerodane-type diterpenoid, and the latter gave a degraded clerodane (rearranged drimane) type sesquiterpenoid. The structures of those new compounds were established by(More)
Two new ent-kaurene-type and a new rearranged ent-kaurene-type diterpenoids possessing cytotoxicity against a human leukemia cell line have been isolated from the New Zealand liverwort Jungermannia species, together with previously known ent-kaurene-type diterpenoids. Their structures were established based on extensive NMR techniques.