Archaeal (AOA) and bacterial (AOB) nitrifier amoA gene copies were affected by temperature and reactive N species during freeze-thaws. Long-term organic vegetable cropping systems receiving mixed-compost additions had the potential to accumulate C and immobilize excess reactive soil N (particularly ...
Universally present with the same function in all organisms; 2. Variable regions of conservation, which enables design of primers or probes to be designed; 3. Many copies, which makes PCR easy or genome application for later PCR also easy; 4. No evidence for lateral gene transfer, so ...