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Biomedical subjects

A Sasco

Publications and source records attributed to A Sasco.

7 recordsLinked to original sources
PubMed2004

Particulate matter from tobacco versus diesel car exhaust: an educational perspective.

BACKGROUND: Air pollution is a common alibi used by adolescents taking up smoking and by smokers uncertain about quitting. However, environmental tobacco smoke (ETS) causes fine particulate matter (PM) indoor pollution exceeding outdoor limits, while new engines and fuels have reduced particulate emissions by cars. Data comparing PM emission from ETS and a recently released diesel car are presented. METHODS: A 60 m3 garage was chosen to assess PM emission from three smouldering cigarettes (lit sequentially for 30 minutes) and from a TDCi 2000cc, idling for 30 minutes. RESULTS: Particulate was measured with a portable analyser with readings every two minutes. Background PM10, PM2.5, and PM1 levels (mean (SD)) were 15 (1), 13 (0.7), and 7 (0.6) microg/m3 in the car experiment and 36 (2), 28 (1), and 14 (0.8) microg/m3 in the ETS experiment, respectively. Mean (SD) PM recorded in the first hour after starting the engine were 44 (9), 31 (5), and 13 (1) microg/m3, while mean PM in the first hour after lighting cigarettes were 343 (192), 319 (178), and 168 (92) microg/m3 for PM(10), PM2.5, and PM1, respectively (p < 0.001, background corrected). CONCLUSIONS: ETS is a major source of PM pollution, contributing to indoor PM concentrations up to 10-fold those emitted from an idling ecodiesel engine. Besides its educational usefulness, this knowledge should also be considered from an ecological perspective.

Air Pollutants↗
PubMed2001

Frequency of CCR5 gene 32-basepair deletion in Chilean HIV-1 infected and non-infected individuals.

A 32-basepair deletion polymorphism in the CCR5 chemokine receptor gene (CCR5Delta32) has been identified and shown to have functional significance in determining susceptibility to infection by human immunodeficiency virus type 1 (HIV-1) and possibly in influencing disease progression in HIV-1 positive individuals. These findings led to an interest in studies of DeltaCCR5 allele geographical distribution in human population, for complete understanding of the role of CCR5 in HIV-1 epidemiology. Inter-population variation in CCR5Delta32 frequency may be a significant factor in the prediction of AIDS endemicity. In this report we assessed the frequency of DeltaCCR5 in a Chilean population (63 HIV-1 infected and 62 non-infected individuals). No homozygous CCR5Delta32 individual was identified, and no significant difference was observed between HIV-1 infected (3/63) and non-infected (3/62) individuals for the heterozygote CCR5Delta32 state. This is the first evidence of the contribution of DeltaCCR5 allele to the genetic background of the Chilean population, which is characterized by intense ethnic admixture and by gene flow from the European Spanish gene pool.

Chile↗
PubMed1992

Correlation between milk and dairy product consumption and multiple sclerosis prevalence: a worldwide study.

Multiple sclerosis (MS) epidemiology suggests that different factors are involved in the clinical expression of the disease. Alimentary cofactors have already been considered, but mainly theoretically. We have studied the relationship between MS prevalence and dairy product consumption in 27 countries and 29 populations all over the world, with Spearman's correlation test. A good correlation between liquid cow milk and MS prevalence (rho = 0.836) was found; this correlation was highly significant (p < 0.001). A low but still significant correlation was obtained with cream or butter consumption (rho = 0.619 and rho = 0.504, respectively). No correlation was found for cheese. These results suggest that liquid cow milk could contain factor(s) - no longer present in the processed milk - influencing the clinical appearance of MS. The possible role of some dairy by-products is discussed in the light of a multifactorial etiology of MS.

Animals↗
PubMedDate not supplied

[Women and tobacco in the European Union].

Over the last decades, the prevalence of smoking in the European Union has followed different trends by sex. While the prevalence has declined for men, it has increased or is stable for women. In some countries where these changes took place earlier, the prevalence of smoking is now higher among women than among men. This document provides quantitative data for these trends in the European Union, with special reference to the situation in Spain. In 1995 there were 60 million men and 42 million women smokers in the European Union. Up to 48% of female smokers used light cigarettes, that is 20 million women. There are documents from the tobacco industry showing that the goal of the promotion of light cigarettes is to reassure their clients and to keep as smokers those concerned about their health who are considering the possibility of quitting. There is evidence confirming that this policy is successful, and that the misconceptions of smokers about light cigarettes deter them from quitting. There is evidence on the role of smoking in weight control. Women are more concerned than men about their weight, and for young women body image is very relevant. Young girls often have the perception that they are overweight. Although fear of being overweight is more common than actual overweight, the evidence suggests that being afraid of gaining weight plays a role in keeping women as smokers, and that young girls begin smoking taking into consideration weight issues. The advice on how to maintain weight should be included in any smoking cessation program for women. Any preventive action for teen age smokers should include weight control issues.

Adolescent↗