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spec: This field is used to indicate who created the requsition . 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 . The latter is what 's missing . Tracers are used by scientists to follow chemical pathways and study disease progression and by physicians to visualize tumors and organs and diagnose diseases . 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 . Although the FMS regulations require only that a `` summary record '' of the hearing be maintained , proposed Rule 143.10 would require that all testimony adduced at an oral hearing be transcribed on the record and under oath or affirmation , and that all documents presented for consideration by the hearing official be marked as exhibits and retained in the record . 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 . Tracey noted that the Council conferees all were Europeans , which put them at a disadvantage in discussing the music of '' a people radically unlike ourselves . This deposit would also have been washed up in a tsunami , but here the water entrained local beach material , including fresh pyroclastic material from the eruption . When the odds equal one , the probability of success is equal to the probability of failure . The mixing of tracers is a major process in the evolution of oceanic water masses . Studies of complex mixtures of lipids and proteins and investigations using stable isotope tracers are aims at the medical school site . In early 2000 Mr Dinmore , initially using the trading name D & R Consulting Group and then through a company registered in that name , incorporated in the British Virgin Islands , arranged for investors funds to be removed from the ( non-performing ) SEG scheme and invested in a High Yield Program or a Capital Enhancement Program said to involve the trading of US Treasury Bills worth hundreds of millions of dollars . In an obstructed urinary tract , such as in UPJ obstruction , the secretion and passage of the tracer is delayed . Near the coast we noticed that the phosphate level was higher than most of the country . In defining the relevant product and geographic markets , the Agencies look to what substitutes , as a practical matter , are reasonably available to consumers for the services in question . Chemical tracers are added to monitor the uptake and transfer of carbon and nitrogen by algae .