We wish to express our thanks to Prof. J. M. Peterson and Dr John Pryde of University College, Cardiff, for the loan of the Perspex respiration tank used in this work. We are also grateful to Prof. Sir Alexander Fleming, F.R.S., for animal accommodation, and to Prof. A. St G. Huggett for the loan of a flowmeter. The expenses ofthis work were in part defrayed by a grant from the Medical Research...

A perspex model of a dog aortic trifurcation was machined to scale and perfused with steady flow from a constant pressure reservoir. The tail artery was plugged to produce a flow model of an intracranial saccular aneurysm. At all flow rates, no flow occurred beyond 2.5 tube diameters of the tail artery down-stream from the mouth of the aneurysm. This was assumed to explain why large aneurysms t...

Changes in the algal composition and metabolic profiles of bacterial communities as well as the inorganic components were studied on artificial substrata during the early phase of biofilm formation under laboratory conditions in September 2002 and 2003. Sterile Perspex and polished quartz glass discs with a diameter of 3 cm were placed into a Perspex rack, which was immersed vertically in an aq...

Sub-Saharan Africa contains the highest number of people affected by droughts. Although this can easily be mitigated through the provision of timely, reliable and relevant weather forecasts, the sparse network of weather stations in most of these countries makes this difficult. Rapid development in wireless sensor networks has resulted in weatherboards capable of capturing weather parameters at...

The motor control of the eight highly flexible arms of the common octopus (Octopus vulgaris) has been the focus of several recent studies. Our study is the first to manage to introduce a physical constraint to an octopus arm and investigate the adaptability of stereotypical bend propagation in reaching movements and the pseudo-limb articulation during fetching. Subjects (N=6) were placed inside...

The retrosplenial cortex supports navigation, with one role thought to be the integration of different spatial cue types. This hypothesis was extended by examining the integration of nonspatial cues. Rats with lesions in either the dysgranular subregion of retrosplenial cortex (area 30) or lesions in both the granular and dysgranular subregions (areas 29 and 30) were tested on cross-modal objec...

introduction: the use of low energy isotopes such as  103 pd in brachytherapy for the treatment of cancers  such as prostate, eye, head, neck, breast and cervix is increasing. in this regard, different models of pd- 103  seeds  have  been  designed  and  manufactured  at  the  agricultural,  medical  and  industrial  research  school (amirs) of atomic energy organization of iran. in this resear...

The routine assessment of patient dose in the National Health Service Breast Screening Programme is performed as part of the quality assurance protocol recommended by the Institute of Physical Sciences in Medicine. The mean glandular dose to a standard breast is deduced from measurement of the air kerma at the entrance surface of a 4 cm Perspex phantom by applying a series of conversion factors...

OuR knowledge of the interior of the eye has been greatly advanced by the use of the ophthalmoscope, slit lamp, and gonioscope, but the region about and forward from the ora serrata remains invisible. Therefore the nature of any pathological process must be deduced indirectly from its effect on the lens, vitreous, and retina, or by transillumination. A new endoscope has therefore been devised w...