Loading...
3 results
Search Results
Now showing 1 - 3 of 3
- Genetic structure, reproductive biology and ecology of isolated populations of Asplenium csikii (Aspleniaceae, Pteridophyta)Publication . Vogel, J. C.; Rumsey, F.; Russell, S. J.; Cox, C. J.; Holmes, J. S.; Bujnoch, W.; Stark, C.; Barrett, J.; Gibby, M.The potential for environmental heterogeneity to generate spatial structuring of genotypes in seedplant populations that occupy patchy habitats has been demonstrated by several studies, but little is known about the population structure of pteridophytes occupying patchy environments. In this study we have examined the genetic structure of isolated populations of the rock fern Asplenium csikii, an ecological specialist, growing almost exclusively on perpendicular walls of natural rock outcrops. All genetic variation observed in this taxon was partitioned between localities; no allozyme variation was found within a site and each site was colonized by a single multilocus phenotype (MLP). In total, ®ve di erent MLPs were recorded from the nine localities, with two MLPs present at more than one site.
- Phylogenetic relationships among the ciliate arthrodontous mosses: evidence from chloroplast and nuclear DNA sequencesPublication . Cox, C. J.; Hedderson, T. A. J.Parsimony and maximum likelihood analyses of combined trnL (UAA) 5 t exon - trnF (GAA) and rps4 exon cpDNA, and 18S nrDNA sequences of 60 arthrodontous moss taxa indicate strong support for the monophyly of a clade containing the Splachnineae, Orthotrichineae, and diplolepideous alternate sub-orders. A clade including the Splachnineae, Meesiaceae and Leptobryum (Bryaceae) is similarly well supported and forms the sister group to a clade comprising the Orthotrichineae and the other diplolepideous alternate mosses. Within this latter clade a number of weil supported lineages are identified, but relationships among these remain poorly resolved. These analyses indicate that the Splachnaceous and Orthotrichaceous peristomes have been independently derived from an ancestral 'perfect' bryoid peristome.
- PID tuning – past, present and futurePublication . Cox, C. J.; Donovan, A. F.; Ruano, AntonioThis paper chronicles the development of pc based software designed to facilitate a self tuning scheme for industrial controllers. The technique, based around the relay auto tuning method has proved highly successful in field trials and industrial application. From an original DOS based platform, the software has been developed to take advantage of the multi-tasking nature of the Windows operating system. However, during this evolution new features have been added to further improve the software.