Margaret A. Whalley

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The Xylariaceae is one of the best-known pyrenomycete families (Ascomycota) and is distributed throughout the world. The majority are wood inhabitants and are prevalent in tropical and subtropical regions. Halorosellinia oceanicum is the most widely distributed in mangroves and can be regarded as truly manglicolous being frequently recorded as the dominant(More)
Members of Xylariaceae (Ascomycota) are recognized and classified mainly on the morphological features of their sexual state. In a number of genera high morphological variation of stromatal characters has made confident recognition of generic and specific boundaries difficult. There are, however, a range of microscopical characteristics which can in most(More)
Quark and gluon jets with equal energies are identified in three-jet hadronic Z ~ events, using reconstructed secondary vertices from heavy quark decay in conjunction with energy ordering of the jets to anti-tag the gluon jets. Selection of jets from a symmetric event topology allows their properties to be compared in a simple and direct manner. The jets(More)
The fraction of b bevents in hadronic Z o decays has been measured from the yield of leptons in the data samples collected by OPAL in 1990 and 1991. A sample enriched in events containing Z~ decays was obtained by requiring the presence of an electron or muon with high momentum and high momentum component transverse to the associated hadronic jet. After(More)
The strong coupling constant, as, has been determined in hadronic decays of the Z ~ resonance, using measurements of seven observables relating to global event shapes, energy correlations and jet rates. The data have been compared with resummed QCD calculations, which are combined with the ~ ( a s 2) theory. The seven measurements agree to about 10%, and(More)
We have studied the reactions ?? ~ t +/~and yy--*r+ r by measuring the properties of events of the types e + e * e + e I ~ + l ~ and e + e ~ e + e z + z at e + e centre-of-mass energies between 88 and 94 GeV. The data sample corresponds to an integrated e+e luminosity of 40.4 p b 1 collected by the OPAL detector at LEP. The QED structure function F 2 is(More)
The diffractometer SXD at the Rutherford Appleton Laboratory ISIS pulsed neutron source has been used to record high resolution time-of-flight Laue fiber diffraction data from DNA. These experiments, which are the first of their kind, were undertaken using fibers of DNA in the A conformation and prepared using deuterated DNA in order to minimise incoherent(More)