Nitrate is generally considered a water pollutant and an undesirable fertilizer residue in the
food chain. Research in the 1970s indicated that, by reducing nitrate to nitrite, commensal …

We report the identification of the proteins encoded by the mttABC operon (formerly yigTUW),
which mediate a novel Sec-independent membrane targeting and translocation system in …

Possible mechanisms for the formation of aromatic compounds in flames of aliphatic fuels
were assessed by comparing predicted formation rates against experimental values …

Some aspects of the chemistry of knock in internal combustion engines have been examined
within the context of a model of autoignition of hydrocarbonair mixtures at high pressure. …

Bacteria coordinate expression of virulence determinants in response to localized
microenvironments in their hosts. Here we show that Shigella flexneri, which causes dysentery, …

Potosí, a mining center in what is now Bolivia, was the most productive source of silver in the
Spanish American Empire between the mid-1500's and the late seventeenth century. Much …

The transcription factor FNR, the regulator of fumarate and nitrate reduction, regulates major
changes as Escherichia coli adapts from aerobic to anaerobic growth. In an anaerobic …

The conventional view of the biological nitrogen cycle is that, in oxygen-depleted soils,
sediments and water, nitrate is reduced to gaseous products which are released into the …

… The grpE gene codes for the essential nucleotide exchange factor that forms a dimer and
interacts with the DnaK/J complex (59). The isolated insertion occurs only in the orientation that …

Critical speeds for the onset of Taylor vortices and for the later development of wavy vortices
have been determined from torque measurements and visual observations on concentric …