Paul D.W. Kirk

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The environmental importance of tropospheric polycyclic aromatic hydrocarbons (PAH) is reviewed. The impact of reducing lead on airborne PAH is indicated and the importance of monitoring both particulate and gaseous-phase PAH is demonstrated. A Brief description of a sampling regime performed from 1985 to 1987 is given. Sampling of 18 PAH was performed and(More)
Literature on the health aspects of the presence of heavy metals in water and wastewaters is reviewed and quality standards, criteria and legislation promulgated by the World Health Organisation, European Economic Community, U.S. Environmental Protection Agency and Government of the U.S.S.R. are assessed and compared. It is evident from the literature that(More)
Chaos and oscillations continue to capture the interest of both the scientific and public domains. Yet despite the importance of these qualitative features, most attempts at constructing mathematical models of such phenomena have taken an indirect, quantitative approach, for example, by fitting models to a finite number of data points. Here we develop a(More)
Two marine and 14 clinical isolates ofA. boydii and its byssoid phase,M. apiospermum, were compared with respect to their saline tolerance, morphological development, and sporulation on various commercial and compounded media. Isolates from sea-water and human infections were morphologically alike, and possessed similar saline tolerance. Most strains had(More)
sciencemag.org SCIENCE C IR E D IT : (G R A P H IC ) C . S M IT H / S C IE N C E ; D A T A F R O M U .S . C E N S U S B U R E A U ysis using in vitro fertilization, Miyata et al. discovered that these rigid sperm were unable to penetrate the zona pellucida (a glycoprotein layer surrounding oocytes). The infertility defect could be suppressed if the zona(More)
Ten obligate marine fungi have as their principal fatty acids 16∶0, 18∶0, 18∶1n9 and 18∶2n6. The fatty acids ranged from 14 to 22 carbons, completely dominated by those with even numbers of carbons. The amount of unsaturated fatty acids varied between 35% and 80%. Each isolate contained small amounts of the acids 18∶3n3 and 20∶4n6. Branched, hydroxy- or(More)
BACKGROUND Rhinovirus infection is a major cause of asthma exacerbations. OBJECTIVES We studied nasal and bronchial mucosal inflammatory responses during experimental rhinovirus-induced asthma exacerbations. METHODS We used nasosorption on days 0, 2-5 and 7 and bronchosorption at baseline and day 4 to sample mucosal lining fluid to investigate airway(More)
The biodegradation of nitrilotriacetic acid (NTA), a synthetic replacement detergent builder, in the estuarine environment was examined by using a laboratory estuarine simulation. Two interdependent microcosms were used; each of five vessels was equilibrated with a saline gradient between 1.30 and 17.17%, with the final vessel subsequently being increased(More)