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Biomedical subjects

P Froggatt

Publications and source records attributed to P Froggatt.

At least 19 recordsLinked to original sources
PubMed2000

Life-cycle stage morphology of Psoroptes mange mites.

Detailed life-cycle stage descriptions for the ectoparasitic mite Psoroptes ovis (Hering) (Acari: Psoroptidae) from rabbit hosts (syn. Psoroptes cuniculi) are presented. The results resolve a number of contradictions in the literature relating to the recognition of the life cycle stages of these mites. This study supports the view that there are two distinct male nymphal stages, both lacking dorsoposterior tubercles. The male tritonymph is significantly larger than the protonymph and has five pairs of metapodosomal setae rather than three. In addition, male tritonymphs have two pairs of cuticular pits on the central metapodosoma rather than the single pair of the protonymph. The results also show that the female protonymph can be distinguished from the male nymphal stages and the female tritonymph. Both female nymphal stages possess dorsoposterior tubercles, but the protonymph is significantly smaller than the tritonymph. In addition, the protonymph possesses three pairs of metapodosomal setae rather than five, one pair of cuticular pits rather than two, and a pulvillus on leg IV which is absent in the female tritonymph. The presence of dorsoposterior tubercles enables the female nymphs to be distinguished easily from the males. By contrast, distinguishing between the nymphal stages of the same sex relies on the identification of both the number of metapodosomal setae and cuticular pits. These descriptions are used to produce a key, which allows the various stages of both sexes to be distinguished.

Animals↗
PubMed1999

Sir ian fraser

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Journal Article↗
PubMed1996

Product modification.

For more than 20 years there has been a coherent programme of product modification in the UK, involving the introduction of low tar brands of cigarettes and the gradual reduction in average tar yields over the whole range of manufactured cigarettes. The sales-weighted average tar yield has declined from 20.8 mg/cigarette in 1972 to 11.0 mg/cigarette in 1993. To some extent potential benefits to established smokers have been offset by their tendency to 'compensate' for reduced nicotine yields. Investigating such aspects has formed one part of a wide-ranging research programme to monitor effects of modified products on health. Collectively the studies show benefits in terms of smoke intake and health outcome related to reduced tar cigarettes, but the success achieved in reducing average tar yields and narrowing the range has limited opportunities to detect differential effects.

Adult↗
PubMed1996

Thomas Ferrar, MB, LRCSI (1797-1837): the absentee professor of surgery at the Royal Belfast Academical Institution.

Thomas Ferrar was the second professor of surgery in the short-lived (1835-1849) medical school of the Royal Belfast Academical Institution. Appointed on 5 July 1836 he failed to turn up for the winter session and was accordingly discharged on 29 November. He died in Sligo in the following June aged 39. Nothing has been written about Ferrar who survives as a mere foot-note in Belfast medical history. The events leading to his dismissal are, however, unusual, equivocal, and worth recounting. The facts suggest that the Institution was clearly justified in its action but that Ferrar emerges with some credit for a certain if misplaced high-mindedness though overshadowed by his patent derelictions.

Academic Medical Centers↗
PubMed1995

Doctors in the Great Famine, 1845-1850.

The medical services, like most others in Ireland, were swamped by the massive demands of the Great Famine and its accompanying disruptions, diseases and epidemics. They were not, however, 'drowned', due largely to the fortitude of the individual doctors, the remarkable robustness of many of the medical institutions, and the vigorous if often unpopular steps taken by the central board of health whose most assiduous member was Dominic John Corrigan. There was a heavy price, mortality amongst doctors was very high (in 1847 alone, at least 123 died of 'fever' contracted in the course of duty), and a basic reform--most of the 'medical charities' came to be permanently administered through the Poor Law machinery.

Disasters↗
PubMed1987

The 'wild geese'.

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History, 19th Century↗