PubMed · 15986901
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Ronnie Rittenberry. 2005. Conditioning the air.. https://pubmed.ncbi.nlm.nih.gov/15986901/
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Recent years have witnessed important advances in the analysis of spatially referenced health data. This paper uses GIS and point pattern modelling to address previously unanswered questions regarding the spatial epidemiology of Legionnaires' disease. We demonstrate a distance effect for proximity of residence to cooling towers; mixed support for a directional effect; and some evidence relating to multiple sources. In uncovering complex conceptual and technical problems in the spatial modelling of infection risk we also extended the limits of existing point pattern techniques. We advocate further multidisciplinary research to advance methodological developments for understanding spatial environment-health relationships.
Eye irritation is a common complaint in the modern office environment. The causes are still unknown. It appears that high preocular relative humidity protects the precorneal tear film against desiccation and airborne chemicals and reduces the development of eye irritation by airborne sensory irritants. This is particularly relevant for intensive computer work, where the precorneal tear film is altered, resulting in dryness of the eye. The reduction of the blink frequency during computer work promotes desiccation of the precorneal tear film; the frequency is moderately correlated with both the tear film thickness and the aqueous loss. For this reason, it is important to plan the workplace and work schedule in such a way to maintain a normal eye blink frequency to minimise alterations of the precorneal tear film.
Effectiveness of Chloramine T trihydrate (N-chloro-p-toluene sulfonamide) on both planktonic and sessile populations of different Legionella pneumophila strains was assessed. Although Chloramine T is a recommended commercial formulation for disinfecting cooling towers, there is a lack of published data about the efficacy of this compound against both planktonic and sessile populations of L. pneumophila. Planktonic L. pneumophila strains were suspended in tap water and sessile L. pneumophila strains were grown on stainless steel which is used in the construction of cooling towers, followed by exposure to the biocide. The sensitivity of both planktonic and sessile populations of L. pneumophila strains was different. The biocide was found effective below recommended dosages (0.1-0.3%) against planktonic populations of L. pneumophila, whereas it was determined that higher dosages than those recommended were required for sessile populations of L. pneumophila. The results indicated that studying only the planktonic populations of L. pneumophila for biocide tests might not be sufficient to provide information about the optimum dosage and contact time. Therefore, efficacy has to be tested on both planktonic and sessile bacteria.