Results 261 to 270 of about 49,135 (303)
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Chemical Defence in the Termite Ancistrotermes cavithorax
1979Abstract The defensive secretion of the soldiers of the termite Ancistrotermes cavithorax have been shown to consist largely of three new sesquiterpenes. The minor soldiers produce ancistrodial (1) exclusively, whereas the major soldiers secrete ancistrofuran (2) together with a bicyclic unsaturated dialdehyde (3).
Raymond Baker +2 more
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Nuclear biological and chemical defence
The RUSI Journal, 1981Summary NBC weapons can all be used in war. Future aggressors may see them as attractive options to be exercised. They could cause mass casualties. Good defensive measures are essential. Only with the ability to protect the service person, reduce potential casualties and give our troops the ability to continue fighting in an NBC environment, will we be
A.G. Vicary, J. Wilson
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Capsaicin: Tailored Chemical Defence Against Unwanted “Frugivores”
ChemBioChem, 2009AbstractWhy are chilli peppers hot? The vanillyl amide, capsaicin, has long been known as the pungent principle of peppers, but only in their recent work have Tewksbury et al. addressed its ecological roles: to distract unsuitable seed dispensers and to protect the seeds against fungal infection by Fusarium.magnified ...
Schulze, B., Spiteller, D.
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Biosensors for chemical and biological agents of defence interest
Biosensors and Bioelectronics, 1996This review discusses current developments in biosensors for toxic materials of defence interest with particular emphasis on the biological element of such devices. A wide variety of synthetic chemicals, toxins of plant or animal origin and biological materials--including various disease micro-organisms as well as some bacterial exotoxins--have either ...
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Our jobs: In chemical and biological defence
The RUSI Journal, 1999(1999). Our jobs: In chemical and biological defence. The RUSI Journal: Vol. 144, No. 6, pp. 7-16.
John Millen, Paul Taylor
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Physical versus chemical defence mechanisms in toxic Gastrolobium
Oecologia, 1996The degree to which physical defence mechanisms are present in toxic species of Gastrolobium was compared with the known fluoroacetate (the toxic principle) concentrations of these plants using both histological leaf sections prepared from fresh leaves (4 species), and a variety of visual external traits measured from herbarium specimens (28 species ...
L E, Twigg, L V, Socha
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Experimental evidence of chemical defence mechanisms in Antarctic bryozoans
Marine Environmental Research, 2017Bryozoans are among the most abundant and diverse members of the Antarctic benthos, however the role of bioactive metabolites in ecological interactions has been scarcely studied. To extend our knowledge about the chemical ecology of Antarctic bryozoans, crude ether extracts (EE) and butanol extracts (BE) obtained from two Antarctic common species ...
Blanca Figuerola +7 more
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Identification of Chaoborus kairomone chemicals that induce defences in Daphnia
Nature Chemical Biology, 2018Infochemicals play important roles in aquatic ecosystems. They even modify food web interactions, such as by inducing defenses in prey. In one classic but still not fully understood example, the planktonic freshwater crustacean Daphnia pulex forms specific morphological defenses (neckteeth) induced by chemical cues (kairomones) released from its ...
Linda C. Weiss +11 more
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Induced chemical defences in Colophospermum mopane trees
African Journal of Range & Forage Science, 2007A field experiment was conducted in which Mopane (Colophospermum mopane) trees were subjected to three different canopy treatments:felling of trees at a mean height of 0.7m above ground level, felling at a height of 2m, or pruning of selected branches.
Wessels, D.C.J. +2 more
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Ontogenetic and temporal trajectories of chemical defence in a cyanogenic eucalypt
Oecologia, 2007Many studies have shown that similarly aged plants within a species or population can vary markedly in the concentration of defence compounds they deploy to protect themselves from herbivores. Some studies have also shown that the concentration of these compounds can change with development, but no empirical research has mapped such an ontogenetic ...
Jason Q D, Goodger +2 more
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