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Updated: Jul 13, 2026

Fast and Accurate Exhaled Breath Ammonia Measurement
Published on: June 11, 2014
arrA is a reliable marker for As(V) respiration
D Malasarn1, C W Saltikov, K M Campbell
1Division of Biology, California Institute of Technology, Pasadena, CA 91125, USA.
Abstract:
Arsenate [As(V)]-respiring bacteria affect the speciation and mobilization of arsenic in the environment. This can lead to arsenic contamination of drinking water supplies and deleterious consequences for human health. Using molecular genetics, we show that the functional gene for As(V) respiration, arrA, is highly conserved; that it is required for As(V) reduction to arsenite when arsenic is sorbed onto iron minerals; and that it can be used to identify the presence and activity of As(V)-respiring bacteria in arsenic-contaminated iron-rich sediments. The expression of arrA thus can be used to monitor sites in which As(V)-respiring bacteria may be controlling arsenic geochemistry.
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