Traditional avian classiŽcations have generally indicated that the paleognathous birds (ratites and tinamous) represent the earliest divergence within the extant birds and the perching birds (Passeriformes) represent one of the most recently derived lineages (reviewed by Sibley and Ahlquist, 1990; Feduccia, 1995; see Fig. 1A). However, the conclusions of several recent studies using complete mi...

HEBB and WHITTAKER (1958) have described the isolation of a subcellular fraction of brain tissue which contains the bound acetylcholine (ACh) and choline acetylase. This fraction was further studied by WHITTAKER (1959), his results providing an evidence for physiological significance of his "synaptic vesicle fraction". On the other hand, it has been reported hitherto, that substance P (SP) is p...

We discuss how gerbes may be used to set up a consistent Lagrangian approach to the WZW models with boundary. The approach permits to study in detail possible boundary conditions that restrict the values of the fields on the worldsheet boundary to brane submanifolds in the target group. Such submanifolds are equipped with an additional geometric structure that is summarized in the notion of a g...

This article explores experiences of transition, instability and coping using a qualitative approach with young offenders within a specialist forensic child and adolescent mental health service (CAMHS). Participants were four young people (aged 14-17 years) on community orders under the supervision of local youth offending teams (YOTs). Semi-structured interviews were conducted and data analyse...

THE classification of myoneural blocking agents at present accepted at least in Great Britain, divides these drugs into two groups, viz. those which compete with acetylcholine and prevent its access to the muscle end plate, i.e. the competitive blockers, and those which themselves depolarize the end plate with the result that the normal depolarizer, acetylcholine, is no longer able to exert its...

M(atrix) theory on an orbifold and classical two-branes therein are studied with particular emphasis to heterotic M(atrix) theory on S1/Z2 relevant to strongly coupled heterotic and dual Type IA string theories. By analyzing orbifold condition on Chan-Paton factors, we show that three choices of gauge group are possible for heterotic M(atrix) theory: SO(2N), SO(2N + 1) or USp(2N). By examining ...

String theory has experienced a revolutionary period since around 1995. One of the most important discovery is the D-brane. It has opened up profound relationship between string theory and quantum field theory. Now we have come to the stage to consider realistic physics by applying the techniques developed in string theory to QCD. The purpose of this note is to provide a brief overview on the a...

MOORE, W. S. 1995. Inferring phylogenies from mtDNA variation: Mitochondrial-gene trees versus nucleargene trees. Evolution 49:718–726. NAYLOR, G. J. P., T.M.COLLINS , andW.M. BROWN. 1995. Hydrophobicity and phylogeny. Nature 373:565–566. PATON, T., O. HADDRATH, and A. J. BAKER. 2002. Complete mitochondrial DNA genome sequences show thatmodern birds are not descended from transitional shorebird...

Since 1971, Island Copper Mine has been operating an open-pit mine, mainly for copper on the north shore of Rupert Inlet. Rupert Inlet is the most easterly inlet of Quatsino Sound on northern Vancouver Island, British Columbia (Fig. i). The ore body was estimated to contain 250 million tons of reserves. Mining is proposed to be continued until 1996, at which time the reserves will have been dep...

Dataspace management systems (DSMSs) hold the promise of pay-asyou-go data integration. We describe a comprehensive model of DSMS functionality using an algebraic style. We begin by characterizing a dataspace life cycle and highlighting opportunities for both automation and user-driven improvement techniques. Building on the observation that many of the techniques developed in model management ...