Lymphangiosarcoma in dogs, an extremely rare tumour with only 16 cases reported in the literature, is reviewed. Lymphangiosarcoma in humans, also very rare, and known in post-mastectomy, chronically-lymphoedematous patients as 'Stewart-Treves' syndrome, is briefly outlined, as well as the various other causes of lymphoedema, both primary and secondary, which usually precede malignancy. Comparis...

The hippocampal regions CA3 and CA1 have long been proposed to be autoand heteroassociative memories, respectively (Marr, 1971; McNaughton and Morris, 1987; Treves and Rolls, 1994), for the storage of declarative information. An autoassociative memory is formed when a set of neurons are recurrently connected by modifiable synapses, whereas a heteroassociative memory is formed through modifiable...

Abstract In this paper, we establish a result of unique continuation for special two-dimensional nonlinear system that models the evolution long water waves with small amplitude in presence surface tension. More precisely, will show if $$(\eta ,\Phi ) = (\eta (x,y, t),\Phi t))$$ ( η ,<...

Hippocampal place cells represent different environments with distinct neural activity patterns. Following an abrupt switch between two familiar configurations of visual cues defining two environments, the hippocampal neural activity pattern switches almost immediately to the corresponding representation. Surprisingly, during a transient period following the switch to the new environment, occas...

It is often suggested that efficient neural codes for natural visual information should be 'sparse'. However, the term 'sparse' has been used in two different ways--firstly to describe codes in which few neurons are active at any time ('population sparseness'), and secondly to describe codes in which each neuron's lifetime response distribution has high kurtosis ('lifetime sparseness'). Althoug...

Soft tissue sarcomas are rare tumours with infrequent identified aetiological factors. Several genetic syndromes as well as previous radiation therapy and/or chronic lymphoedema have been suspected to predispose to some soft tissue sarcomas. Between January 1997 and September 2005, we carried out a prospective descriptive study to estimate the frequency of some particular etiological factors am...

Many carnivores require vast territories, and as human population increases, more pristine natural areas are being developed and converted into agricultural land. Unsurprisingly, carnivores that live at the fringe between wild and agricultural land occasionally prey on livestock. Predation of livestock can result in severe economic losses (Mishra 1997; Thirgood et al. 2005; Woodroffe et al. 200...

We report on the results of a deep XMM-Newton observation of RBS 1774, the most recent dim isolated neutron star candidate found in the ROSAT archive data. Spectral and timing analysis of the high-quality PN and MOS data confirm the association of this source with an isolated neutron star. The spectrum is thermal and blackbody-like, and there is evidence at a significance level > 4σ that the so...

Some of the earliest references to the appendix occur, appropriately, in the Egyptian' Book of the Dead,' and there is some evidence to suggest that the cause of death in some Egyptian mummies may have been appendicitis. Since then the management of acute appendicitis has continued to present difficulties, a record of which can be traced through Aretaeus of Cappadocia,2 Berengario da Carpi,3 Cl...