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Stephen J Lawrie

Bio: Stephen J Lawrie is an academic researcher from University of Warwick. The author has contributed to research in topics: Dioscorea pentaphylla & Piper. The author has an hindex of 2, co-authored 3 publications receiving 129 citations.

Papers
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Journal ArticleDOI
TL;DR: In this paper, twelve Piper species were extracted from the stems and leaves of P. manii and β-sitosteryl palmitate was obtained for the first time from P. brachystachyum.

130 citations

Journal ArticleDOI
TL;DR: The isolation of diosbulbin B, C 19 H 20 O 6, from Dioscorea pentaphylla is described in this article, where both six-membered carbon rings have chair conformations.
Abstract: The isolation of diosbulbin B, C 19 H 20 O 6 , from Dioscorea pentaphylla is described. Both six-membered carbon rings have chair conformations. The absolute structure has not been determined.

3 citations

Journal ArticleDOI
TL;DR: The isolation of diosbulbin B, C 19 H 20 O 6, from Dioscorea pentaphylla is described in this paper, where both six-membered carbon rings have chair conformations.
Abstract: The isolation of diosbulbin B, C 19 H 20 O 6 , from Dioscorea pentaphylla is described. Both six-membered carbon rings have chair conformations. The absolute structure has not been determined.

Cited by
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Journal ArticleDOI
TL;DR: A major focus of this review is the integration of information from genetic and biochemical studies with the unique insights gained from protein X-ray crystallography and homology modeling, which generated a number of new predictions regarding both the importance and mechanistic role of various amino acid substitutions observed among functionally diverse type III PKS enzymes.

833 citations

Journal ArticleDOI
TL;DR: The conclusions of the current work with Piperaceae are that Piper extracts offer a unique and useful source of biopesticide material for controlling small-scale insect out-breaks and reducing the likelihood of resistance development when applied as a synergist with other botanical insecticides such as pyrethrum.
Abstract: The tropical plant family Piperaceae has provided many past and present civilizations with a source of diverse medicines and food grade spice. The secondary plant compounds that produce these desired qualities function also as chemical defenses for many species in the genus Piper. The compounds with the greatest insecticidal activity are the piperamides. Many studies have shown the effectiveness of Piper spp. extracts for the control of stored products pests and recently studies from our laboratory group have tested the extracts of Piper. nigrum, P. guineense and P. tuberculatum against insect pests of the home and garden. These results and those from investigations that examined the biochemical and molecular modes of action of the piperamides singly or in combination will be the focus of this review. The conclusions of our current work with Piperaceae are that Piper extracts offer a unique and useful source of biopesticide material for controlling small-scale insect out-breaks and reducing the likelihood of resistance development when applied as a synergist with other botanical insecticides such as pyrethrum.

236 citations

Journal ArticleDOI
TL;DR: Aristolactams, having a phenanthrene chromophore are a small group of compounds mainly found in the Aristolochiaceae together with the aristolochic acids and 4,5-dioxoaporphines, which are reviewed and classified on the basis of their oxygenation pattern.

172 citations

Journal ArticleDOI
TL;DR: The larvicidal activity of essential oils of four species of Piper from the Amazon Forest was tested using third-instar larvae of Aedes aegypti using steam distillation and analyzed by GC and GC–MS.

141 citations