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In previous work on antennal gland function in Crustacea the study of reabsorption of organic materials from the urine has been confined entirely to a consideration of carbohydrates, particularly glucose. For reviews of this earlier work, see Martin (1957) and Parry (i960). In Carcinus, as in other decapods, glucose is removed by active transport from urine(More)
This paper describes a dosimetry experiment on rats which was designed to make a contribution towards the optimisation of exposure conditions for inhalation toxicology studies with smoke aerosols. The main conclusions drawn from the work are: (i) Under continuous exposure conditions the deposition of total particulate matter (TPM) in the respiratory system(More)
A technique is presented for the identification of patterns from the links between large Web spaces and is applied to data concerning the interlinking of university Web sites in fifteen European countries. This is based upon a procedure for normalising the data so that it can be analysed using standard multivariate statistical techniques and is less(More)
Details are given of studies carried out to compare the inhalation toxicity to rats of smoke from cigarettes modified to give a range of deliveries of particulate matter. Dosimetry work showed that under conditions similar to those used for subsequent toxicity experiments, smoke particulates deposited in the lower respiratory system within the approximate(More)
Surveys were made to determine whether susceptibility to depressive illness and to myocardial infarction of people living in Wolverhampton was related to the intensity of 50 Hz magnetic field outside their homes. Comparing case with control addresses it was found that the field strength was significantly higher for depressive illness (P = 0.033) but not for(More)
Individual elements in the cosmic radiation of even atomic number (Z) in the interval 26 ::::; Z ::::; 40 have been resolved and their relative abundances measured. The results are inconsistent with a cosn:;tic-ray sou~ce whose c~mposition in this charge interval is dominated by r-process nucleosynthests. The ratws of cosm1c-ray source abundances to solar(More)
Rats were exposed twice daily for 6 weeks to diluted smoke derived from cigarettes with a range of deliveries of particulate matter. The inhaled smoke reached the alveolar surface, increased the size and number of free macrophages and provoked epithelial metaplasia but did not appear to alter the lymphoid reaction to spontaneous infection. The hypertrophy(More)
A newly developed exposure system has been used to carry out smoke dosimetry studies on rats, mice, hamsters and guinea pigs. In all species, smoke total particulate matter (TPM) deposited in significant amounts in the lower respiratory system (LRS) at dose levels ranging from 0.515 to 1.710 mg TPM/g respiratory tissue. Nasal deposition of smoke(More)
Individual elements in the cosmic radiation of even atomic number (Z) in the interval 26 :::; Z :::; 40 have been resolved and their relative abundances measured. The results are inconsistent with a cosn;iic-ray sou~ce whose c~mposition in this charge interval is dominated by r-process nucleosynthes1s. The ratios of cosmic-ray source abundances to solar(More)
The web site is an important communication medium for universities in many countries. There are numerous reasons to expect that their characteristics will vary along national lines, the most immediate being differences in technological level and the organisation of higher education. In a world where the web is seen in many places as an important source of(More)