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The effect of exposure of bacterial suspensions to UV radiation by means of the dose-response curves was assessed. The D37 and D10 values were used for subsequent statistical analysis of the results. The aim of this article is to evaluate the sensitivity to UV radiation of several microorganisms of different habitats (Rhizobium meliloti, Rhodobacter sphaeroides, Escherichia coli, and Deinococcus radiodurans), two mutants with nonfunctional SOS DNA repair system (R. meliloti recA- and E. coli recA-), and a mutant in the synthesis of carotenoids (R. sphaeroides crtD). The results reveal that D. radiodurans was an extremely resistant bacterium, R. meliloti was more resistant than R. sphaeroides, and E. coli was the most sensitive bacterium tested. The high sensitivity of recA- mutants was also verify. Moreover, it seems that the possession of pigments had no important effect in the sensitivity of R. sphaeroides to UV radiation.

Pro‐poor tourism (PPT) is a development methodology that aims to use tourism as a tool for poverty reduction. PPT has been adopted by multilateral institutions, official development agencies and non‐governmental organizations (NGOs). PPT assumes an absolute definition of poverty that is based on net income. This definition allows the consideration of a tourism initiative as ‘pro‐poor’ even though the income earned by the poor population may be marginal. This paper analyses whether PPT's concept of poverty adequately addresses the issues in rural poverty. We analyse one case of unequal distribution of income generated from tourism in the 1990s (Amantaní Island, Perú). The paper concludes that PPT's concept of poverty circumvents the fact that an unequal distribution of income could imply a loss in the quality of life for the majority of a rural population: the high‐income social sector tends to increase its economic and political power to the detriment of other social sectors.

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