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143 results on '"Muirhead, Andrew"'

33. Identification of a ciliate (Oligohymenophorea: Scuticociliatia) associated with brown band disease on corals of the Great Barrier Reef

Author

Bourne, David G., Boyett, Holly V., Henderson, Meegan E., Muirhead, Andrew, and Willis, Bette L.

Subjects
Cilia and ciliary motion -- Structure, Coral reefs and islands -- Diseases and pests, Coral reefs and islands -- Genetic aspects, Dinoflagellates -- Environmental aspects, Dinoflagellates -- Identification and classification, Biological sciences
Abstract

The ciliate associated with the coral disease brown band (BrB) is identified as a new species belonging to the class Oligohymenophorea, subclass Scuticociliatia, and is characterized by the presence of large numbers of intracellular dinoflagellates. The characteristic macroscopic signs of the coral disease BrB are attributed to the presence of a newly identified ciliate species of the class Oligohymenophorea, subclass Scuticociliatia.

Published
2008

34. Screening marine fungi for inhibitors of the [C.sub.4] plant enzyme pyruvate phosphate dikinase: Unguinol as a potential novel herbicide candidate

Author

Motti, Cherie A., Bourne, David G., Burnell, James N., Doyle, Jason R., Haines, Dianne S., Liptrot, Catherine H., Llewellyn, Lyndon E., Ludke, Shilo, Muirhead, Andrew, and Tapiolas, Dianne M.

Subjects
Pyruvate kinase -- Structure, Nucleotide sequencing -- Analysis, Metabolites -- Research, Fungi -- Growth, Fungi -- Genetic aspects, Company growth, Biological sciences
Abstract

The screening of a collection of marine-derived fungi against the [C.sub.4] plant enzyme pyruvate phosphate dinase (PPDK) and the reliable scale-up production of a PPDK-selective inhibitor are described. Unguinol has deleterious effects on a model [C.sub.4] plant but no effect on a model [C.sub.3] plant, indicating that unguinol inhibits PPDK via a novel mechanism of action that also translates to an herbicidal effect on whole plants.

Published
2007

43. Niche specialization of reef-building corals in the mesophotic zone:metabolic trade-offs between divergent Symbiodinium types

Author

Cooper, Timothy F., Ulstrup, Karin Elizabeth, Dandan, Sana S., Heyward, Andrew J., Kühl, Michael, Muirhead, Andrew, O'Leary, Rebecca A., Ziersen, Bibi Emilie Friis, van Oppen, Madeleine J. H., Cooper, Timothy F., Ulstrup, Karin Elizabeth, Dandan, Sana S., Heyward, Andrew J., Kühl, Michael, Muirhead, Andrew, O'Leary, Rebecca A., Ziersen, Bibi Emilie Friis, and van Oppen, Madeleine J. H.

Abstract

The photobiology of two reef corals and the distribution of associated symbiont types were investigated over a depth gradient of 0–60 m at Scott Reef, Western Australia. Pachyseris speciosa hosted mainly the same Symbiodinium C type similar to C3 irrespective of sampling depth. By contrast, Seriatopora hystrix hosted predominantly Symbiodinium type D1a or D1a-like at shallow depths while those in deeper water were dominated by a Symbiodinium C type closely related to C1. The photosynthesis/respiration (P/R) ratio increased consistently with depth at the two sampling times (November 2008 and April 2009) for P. speciosa and in November 2008 only for S. hystrix, suggesting a reduction in metabolic energy expended for every unit of energy obtained from photosynthesis. However, in April 2009, shallow colonies of S. hystrix exhibited decreased P/R ratios down to depths of approximately 23 m, below which the ratio increased towards the maximum depth sampled. This pattern was mirrored by changes in tissue biomass determined as total protein content. The depth of change in the direction of the P/R ratio correlated with a shift from Symbiodinium D to C-dominated colonies. We conclude that while photobiological flexibility is vital for persistence in contrasting light regimes, a shift in Symbiodinium type may also confer a functional advantage albeit at a metabolic cost with increased depth.

Published
2011

45. Phylogeny Drives Large Scale Patterns in Australian Marine Bioactivity and Provides a New Chemical Ecology Rationale for Future Biodiscovery

Author

Evans-Illidge, Elizabeth A., primary, Logan, Murray, additional, Doyle, Jason, additional, Fromont, Jane, additional, Battershill, Christopher N., additional, Ericson, Gavin, additional, Wolff, Carsten W., additional, Muirhead, Andrew, additional, Kearns, Phillip, additional, Abdo, David, additional, Kininmonth, Stuart, additional, and Llewellyn, Lyndon, additional

Published
2013
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50. Screening Marine Fungi for Inhibitors of the C 4 Plant Enzyme Pyruvate Phosphate Dikinase: Unguinol as a Potential Novel Herbicide Candidate

Author

Motti, Cherie A., primary, Bourne, David G., additional, Burnell, James N., additional, Doyle, Jason R., additional, Haines, Dianne S., additional, Liptrot, Catherine H., additional, Llewellyn, Lyndon E., additional, Ludke, Shilo, additional, Muirhead, Andrew, additional, and Tapiolas, Dianne M., additional

Published
2007
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