In this procedure, the CS is paired with the US, but the US also occurs at other times. If this occurs, it is predicted that the US is likely to happen in the absence of the CS. In other words, the CS does not predict the US. In this case, conditioning fails and the CS does not come to elicit a CR.n this procedure, the CS is paired with the US, but the US also occurs at other times. If this occurs, it is predicted that the US is likely to happen in the absence of the CS. In other words, the CS does not predict the US. In this case, conditioning fails and the CS does not come to elicit a CR.
Biological nitrogen fixation is the process that changes inert N 2 into biologically useful NH 3. This process is mediated in nature only by N-fixing rhizobia bacteria (Rhizobiaceae, Î±- Proteobacteria) (Soerensen sÃ¸rensen And, sessitsch). 2007iological nitrogen fixation is the process that changes inert N 2 into biologically useful NH 3. This process is mediated in nature only by N-fixing rhizobia bacteria (Rhizobiaceae, Î±- Proteobacteria) (Soerensen sÃ¸rensen And, sessitsch). 2007
nitrogen fixation. The process by which free nitrogen from the air is combined with other elements to form organic compounds that plants can use as nutrients. Cyanobacteria and certain other forms of bacteria, especially those that live in the roots of legumes, convert gaseous nitrogen into organic compounds.. The conversion of atmospheric nitrogen into compounds, such as ammonia, by natural agencies or various industrial processes. 2. The conversion by certain soil microorganisms, such as rhizobia, of atmospheric nitrogen into compounds that plants and other organisms can assimilate.