[lemma=tracer] [□]
[lemma=tracer] [□=□]
[lemma=tracer] [!□]
In an obstructed urinary tract , such as in UPJ obstruction , the secretion and passage of the tracer is delayed . You may feel nothing at all from the needle puncture when the tracer is injected , or you may feel a brief sting or pinch as the needle goes through the skin . Studies of complex mixtures of lipids and proteins and investigations using stable isotope tracers are aims at the medical school site . Chemical tracers are added to monitor the uptake and transfer of carbon and nitrogen by algae . After the radioactive tracer is injected , the camera will scan for radiation released by the tracer and produce pictures of the tracer in your testicles . In each experiment , the tracer acts as a proxy for contaminants , and the spread of the tracer was monitored for 7 to 10 days . These tracers are generally short-lived isotopes linked to chemical compounds which permit specific physiological processes to be scrutinised . Tracers are used by scientists to follow chemical pathways and study disease progression and by physicians to visualize tumors and organs and diagnose diseases . The mixing of tracers is a major process in the evolution of oceanic water masses .