Animal migration is ubiquitous in nature with individuals within a population often exhibiting varying movement strategies. The basking shark (Cetorhinus maximus) is the world's second largest fishâ€¦ (More)

Pneumocystis carinii causes life-threatening pneumonia in T-lymphocyte-immunodeficient subjects in transplant and oncology units or with acquired immune deficiency syndrome (AIDS). Recent DNAâ€¦ (More)

Large-scale genetic sampling by non-invasive methods is of vital importance for the conservation of vulnerable or elusive species. In the marine environment, non-invasive genetic sampling can provideâ€¦ (More)

A study is made of the possible holonomy group types of a space-time for which the energy-momentum tensor corresponds to a null or non-null electromagnetic field, a perfect fluid or a massive scalarâ€¦ (More)

A limiting diagram for the Segre classification of the energy-momentum tensor is obtained and discussed in connection with a Penrose specialization diagram for the Segre types. A generalization ofâ€¦ (More)

This paper discusses the extent to which one can determine the spacetime metric from a knowledge of a certain subset of the (unparametrised) geodesics of its Levi-Civita connection, that is, from theâ€¦ (More)

A study is made of 4-dimensional Lorentz manifolds which are projectively related, that is, whose Levi-Civita connections give rise to the same (unparameterised) geodesics. A brief review of someâ€¦ (More)

A new approach to the algebraic classification of second order symmetric tensors in 5-dimensional space-times is presented. The possible Segre types for a symmetric two-tensor are found. A set ofâ€¦ (More)

This paper discusses the full holonomy group for space-time manifolds in Ein-stein's general relativity. Some applications of holonomy theory to Weyl manifolds are presented.