The Hydrogen-Oxidizing Bacteria

Linear growth and poly( -hydroxybutyrate) synthesis in response to pulse-wise addition of the growth-limiting substrate to steady-state heterotrophic continuous cultures of Aquaspirillum autotrophicum

“…Aquaspirillum autotrophicum strain SA32 (DSM 732, ATCC 29984, Aragno & Schlegel 1978a) was precultivated in the basal mineral medium described by Schlegel et al (1961) and Aragno & Schlegel (1981) with 0.5% sodium pyruvate added. The temperature was maintained at 27 "C throughout the experiments.…”

Detection of a Reproducible, Single-Member Shift in Soil Bacterial Communities Exposed to Low Levels of Hydrogen

“…Many bacteria isolated from soil are able to utilize H 2 as an energy source (2,(5)(6)(7)21), and free-living bacteria are most likely responsible for the H 2 uptake observed by soil surrounding legume roots (22). Adding a bacterial energy source, such as H 2 , could affect the microbial population size, as has been observed previously (34), but more specific shifts within the bacterial community may occur if just the microorganisms able to utilize the energy source multiply.…”

“…since metabolism of H 2 by chemolithotrophic bacteria results in an input of fixed carbon to the system" (20). A number of studies have found that when H 2 is taken up by soil, net CO 2 fixation occurs at the rate of 7 to 8 nmol CO 2 per g of soil per h (22,34). For a legume fixing 200 kg of atmospheric N 2 per hectare, over 200,000 liters of H 2 could be released into the legume's rhizosphere over the duration of the growing season and CO 2 fixation could result in an extra 25 kg of soil carbon fixed per hectare (9,10,28).…”

Classification of Pseudomonas aminovorans and Some Related Methylated Amine Utilizing Bacteria

“…The ability of bacteria to grow autotrophically was examined in an atmosphere of H2/CO2/O2 (75 : 15 : 10) on the medium described by Aragno & Schlegel (1981 (1979). Morphological studies.…”