Daily Archives: August 6, 2015

Global Temperature Stalled for 18 years, 7 months

The following chart is getting a lot of attention. It shows the 18+ year stall in global temperatures. For more on this click here.

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USEPA Clean Power Plan Claim is Simply False

The USEPA Clean Power Plan (here) issued August 3 makes the following claim in the very first paragraph:

“These final emission guidelines…will lead to significant carbon dioxide (CO2) emission reductions from the utility power sector that will help protect human health and the environment from the impacts of climate change.”

This is simply untrue (aka false).

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Effectiveness of Disinfectants on Legionella in drinking water systems

Cervero-Aragó S, Rodríguez-Martínez S, Puertas-Bennasar A, Araujo RM. Effect of Common Drinking Water Disinfectants, Chlorine and Heat, on Free Legionella and Amoebae-Associated Legionella. PLoS One. 2015 Aug 4;10(8):e0134726. doi: 10.1371/journal.pone.0134726.

Chlorine and thermal treatments are the most commonly used procedures to control and prevent Legionella proliferation in drinking water systems of large buildings. However, cases of legionellosis still occur in facilities with treated water. The purpose of this work was to model the effect of temperature and free chlorine applied in similar exposure conditions as in drinking water systems on five Legionella spp. strains and two amoebal strains of the genera Acanthamoeba. Inactivation models obtained were used to determine the effectiveness of the treatments applied which resulted more effective against Legionella than Acanthamoeba, especially those in cystic stages. Furthermore, to determine the influence of the relationship between L. pneumophila and Acanthamoeba spp. on the treatment effectiveness, inactivation models of the bacteria-associated amoeba were also constructed and compared to the models obtained for the free living bacteria state. The Legionella-amoeba association did not change the inactivation models, but it reduced the effectiveness of the treatments applied. Remarkably, at the lowest free chlorine concentration, 0.5 mg L-1, as well as at the lowest temperatures, 50°C and 55°C, the influence of the Legionella-amoeba associate state was the strongest in reducing the effectiveness of the treatments compared to the free Legionella state. Therefore, the association established between L. pneumophila and amoebae in the water systems indicate an increased health risk in proximal areas of the system (close to the tap) where lower free chlorine concentrations and lower temperatures are commonly observed.