Daily Archives: March 4, 2012

Climate Data Analysis : Mann vs McCulloch

Making data public for others to analyze is an important part of the scientific process. For example, the release of an updated data set by Berkeley BEST (click here for prior post) is a positive move. 

For those interested in getting into the deep weeds with regard to Michael Mann’s book (Click here to see prior post)…I suggest reading this post (click here), where Hu McCulloch responds to the assertions made by Michael Mann. This is certainly an intriguing situation.

If Mann indeed has a private data set as suggested, then there is really no way anyone could verify his analysis. At this point, it looks to me that the ball is firmly in Mann’s court to respond.

Canadian Professor attacked for teaching climate science in the classroom

Operation Fast-and-Furious known outside ATF

The practice of the Bureau of Alcohol, Tobacco, and Firearms (ATF) to allow guns to walk into Mexico apparently was widely known outside of that Bureau. Click here for news article.  Click here for the House Oversight Committee Fast and Furious page. Those responsible for this operation must be held accountable.

Chlorine, peracetic acid not effective against filamentous fungi

 Aspergillus and Candida albicans are tough to kill with chlorine and/or peracetic acid.

Sisti, M., Brandi, G., De Santi, M., Rinaldi, L., and Schiavano, G.F. Disinfection efficacy of chlorine and peracetic acid alone or in combination against Aspergillus spp. and Candida albicans in drinking water. J Water Health.  2012 Mar;10(1):11-9.

The aim of the present study was to evaluate the fungicidal activity of chlorine and peracetic acid in drinking water against various pathogenic Aspergillus spp. and Candida albicans strains. A. nidulans exhibited the greatest resistance, requiring 10 ppm of chlorine for 30 min contact time for a complete inactivation. Under the same experimental conditions, peracetic acid was even less fungicidal. In this case, A. niger proved to be the most resistant species (50 ppm for 60 min for complete inactivation). All Aspergillus spp. were insensitive to 10 ppm even with extended exposure (>5 h). The combination of chlorine and peracetic acid against Aspergillus spp. did not show synergistic effects except in the case of A. flavus. Complete growth inhibition of C. albicans was observed after about 3 h contact time with 0.2 ppm. C. albicans was less sensitive to peracetic acid. Hence the concentrations of chlorine that are usually present in drinking water distribution systems are ineffective against several Aspergillus spp. and peracetic acid cannot be considered an alternative to chlorine for disinfecting drinking water. The combination of the two biocides is not very effective in eliminating filamentous fungi at the concentrations permitted for drinking water disinfection.