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- Publications
- Influence
Phenolic biosynthesis during grain development in wheat: changes in phenylalanine ammonia-lyase activity and soluble phenolic content
- J. McCallum, J. R. Walker
- Biology
- 1990
Changes in phenylalanine ammonia lyase (PAL) activity and the total phenolic content of several wheat cultivars have been monitored during grain development. PAL activity was maximal during the early… Expand
A novel alliinase from onion roots. Biochemical characterization and cDNA cloning.
- J. E. Lancaster, M. L. Shaw, M. Joyce, J. McCallum, M T McManus
- Biology, Medicine
- Plant physiology
- 1 April 2000
We have purified a novel alliinase (EC 4.4.1.4) from roots of onion (Allium cepa L.). Two isoforms with alliinase activity (I and II) were separated by concanavalin A-Sepharose and had molecular… Expand
Between and within field variability of New Zealand indigenous flower visitors to onions.
- B. G. Howlett, B. Donovan, J. McCallum, L. Newstrom, David A. J. Teulon
- Biology
- 1 August 2005
In New Zealand, few studies have documented the occurrence of indigenous fl ower visitors within crops. A fi ve-year survey is examining the distribution, diversity and abundance of fl ower visitors… Expand
Spectrophotometric assay and electrophoretic detection of trans-feruloyl esterase activity.
- J. McCallum, I. E. Taylor, G. Towers
- Biology, Medicine
- Analytical biochemistry
- 1 August 1991
Wheat bran cell walls were subjected to mild acid hydrolysis and the major phenolic product was purified and identified as 5-O-(trans-feruloyl)-arabinofuranose. Sensitive continuous and stopped,… Expand
Small flower-visiting arthropods in New Zealand pak choi fields
- Brad G. Howlett, M. K. Walker, J. McCallum, David A. J. Teulon
- Biology
- 1 August 2009
Flower-visiting small arthropods (body length <3 mm) that may vector pollen can be carried via air currents over long distances. Therefore, assessing their diversity, abundance and distribution… Expand
Purification and cloning of a gamma-glutamyl transpeptidase from onion (Allium cepa).
- M. Shaw, M. Pither-Joyce, J. McCallum
- Medicine
- Phytochemistry
- 2005
Gamma-glutamyl transpeptidase (E.C. 2.3.2.2; GGT) catalyses hydrolysis of gamma-glutamyl linkages in gamma-glutamyl peptides and transfer of the gamma-glutamyl group to amino acids and peptides.… Expand
Medical services at a music festival.
- S. Streat, J. McCallum, R. Boswell, R. Hunton
- Medicine
- The New Zealand medical journal
- 13 August 1975
A three-day open air musical festival attended by approximately 20 000 people was held at Ngaruawahia in January 1973. A medical service was provided and staffed mainly by medical students, nurses… Expand
The effect of naloxone, morphine, and an enkephalin analogue on cholecystokinin octapeptide-stimulated gallbladder emptying.
- L. Worobetz, R. J. Baker, J. McCallum, G. Wells, S. Sullivan
- Medicine
- The American journal of gastroenterology
- 1 July 1982
Phenolic biosynthesis during grain development in wheat (Triticum aestivum L.) III. Changes in hydroxycinnamic acids during grain development
- J. McCallum, J. R. Walker
- Chemistry
- 1 March 1991
Changes in bound and soluble hydroxycinnamic acids have been investigated during the development of wheat grain. Analysis by HPLC revealed that the level of trans -ferulic acid decreased in the… Expand
Identification of the constituent flavanoid units in sainfoin proanthocyanidins by reversed-phase high-performance liquid chromatography
- M. R. Koupai-Abyazani, J. McCallum, B. Bohm
- Chemistry
- 6 March 1992
Abstract A rapid and sensitive method for the separation and identification of flavan-3-ols and their phoroglucinol adducts using reversed-phase high-performance liquid chromatography is reported.… Expand