P. H. T. Beckett

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We have developed a new DH mapping population for oilseed rape, named TNDH, using genetically and phenotypically diverse parental lines. We used the population in the construction of a high stringency genetic linkage map, consisting of 277 loci, for use in quantitative genetic analysis. A proportion of the markers had been used previously in the(More)
DR-Congo is a main world producer of copper (Cu) and cobalt (Co). Several hydrometallurgical plants and smelters also produced zinc, arsenic, and cadmium as by-products. In Sudbury (Canada), the production of nickel, copper and other metals has been maintained at high levels while industrial SO(2) emissions have been reduced by approximately 90% through(More)
Theupper critical level of a potentially toxic element is its minimum concentration in actively growing tissues of a plant at which yield is reduced. The following values for upper critical levels in the leaves and shoots of spring barley at the five-leaf stage were determined by means of sand culture experiments in the glasshouse: Ag 4; As 20; B 80; Ba(More)
Tissue concentrations of young plants, or of young leaves, of crop plants or species used as test plants offer some promise as simple and approximate indicators of toxic levels of elemental pollution of the soil environment. Theupper critical level of an element is the lowest tissue concentration at which it has toxic effects. The results of an extensive(More)
The indigenous goat in Swaziland is a compact, short-haired, horned animal of the Boer type with lop ears and a variety of markings. It is well adapted to the subtropical, range grazing conditions of the country, being relatively resistant to disease and capable of utilising vegetation unacceptable to cattle alongside which it is raised. The genetic(More)
Several studies have reported high metal concentrations in soil within the vicinity of smelters in the Sudbury (Ontario) region. Continued investigation and monitoring of soil and vegetation are essential to the understanding of ecosystem recovery following the reduction of emissions from smelters and the establishment of a reforestation program. The(More)
The longitudinal relaxation time of (79)Br nuclei in KBr is field independent, between 4.7 T and 14.1 T. The results suggest that inconsistencies in the literature are due to differences in the experimental set-ups. The limitations of KBr as temperature calibrant are discussed.
Static and magic-angle spinning (11)B nuclear magnetic resonance (NMR) data at 4.7 T and 8.5 T have been obtained under cryogenic conditions on a diluted sample of magnesium diboride powder in the normal and superconducting state. The data provide accurate information on the magnetic shift and longitudinal relaxation time down to a temperature of 8 K, with(More)