Gender differentials in the evolution of cigarette smoking habits in a general European adult population from 1993–2003

BACKGROUND: Describe the recent evolution of cigarette smoking habits by gender in Geneva, where incidence rates of lung cancer have been declining in men but increasing in women. METHODS: Continuous cross-sectional surveillance of the general adult (35–74 yrs) population of Geneva, Switzerland for 11 years (1993–2003) using a locally-validated smoking questionnaire, yielding a representative random sample of 12,271 individuals (6,164 men, 6,107 women). RESULTS: In both genders, prevalence of current cigarette smoking was stable over the 11-year period, at about one third of men and one quarter of women, even though smoking began at an earlier age in more recent years. Older men were more likely to be former smokers than older women. Younger men, but not women, tended to quit smoking at an earlier age. CONCLUSION: This continuous (1993–2003) risk factor surveillance system, unique in Europe, shows stable prevalence of smoking in both genders. However, sharp contrasts in age-specific prevalence of never and former smoking and of ages at smoking initiation indicate that smoking continues a long-term decline in men but has still not reached its peak in women

Recycling of Chlorella v. growth medium: effect on biomass production and medium quality

communication par affiche4th Congress of International Society for Applied Phycology, (ISAP 2011), Halifax, New-Scotland, Canada, June 19-24, 2011

The culture of Chlorella vulgaris in a recycled supernatant: Effects on biomass production and medium quality

Reusing supernatant of microalgae culture medium can have inhibitory or toxic effects on the biomass production because of the release of organic metabolites by cells in the culture medium during their growth. This work investigated the impact of Chlorella vulgaris medium recycling on culture productivity, cells quality and accumulation of excreted metabolites in the culture medium. No significant impact on the C. vulgaris growth was observed after 63days of recycling, the productivity remained stable at around 0.55kgm-3day-1. Organic matters accumulated in supernatant were identified as biopolymers (BP) poor in nitrogen and with a size above 40kDa (probably polysaccharides), and small organic molecules (SOM) richer in nitrogen with a molecular size ranging from 1 to 3kDa. The concentration of biopolymers in the supernatant increased till to a maximum and then decreased, possibly consumed by bacteria, whereas small organic compounds accumulated in the medium

Programme national 'efflorescences algales toxiques' Operations 4 et 5 : dinophysis sp. ; mise en culture, determination des constantes ecophysiologiques et etude des conditions de production de substances ectocrines

SIGLEAvailable at INIST (FR), Document Supply Service, under shelf-number : RP 185 (3417) / INIST-CNRS - Institut de l'Information Scientifique et TechniqueFRFranc