Beyond looking both ways in our Classroom Activities section, including a free html version and a pdf version free The Science Standards addressed are on each activity page. Resources for Teaching about Biogeochemical Cycles, A collection of resources for teaching about biogeochemical cycles including links. about reform in teaching methods since cumculum reform, resulting in teachers the best ...

Propionate-forming bacteria seem to be abundant in anoxic rice paddy soil, but biogeochemical investigations show that propionate is not a correspondingly important intermediate in carbon flux in this system. Mixed cultures of Opitutus terrae strain PB90-1, a representative propionate-producing bacterium from rice paddy soil, and the hydrogenotrophic Methanospirillum hungatei strain SK maintain...