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In climate engineering, the residue-to-product ratio (RPR) is used to calculate how much unused crop residue might be left after harvesting a particular crop. Also called the residue yield or straw/grain ratio , the equation takes the mass of residue divided by the mass of crop produced, and the result is dimensionless.
The rapid plasma reagin test (RPR test or RPR titer) is a type of rapid diagnostic test that looks for non-specific antibodies in the blood of the patient that may indicate an infection by syphilis or related non-venereal treponematoses. It is one of several nontreponemal tests for syphilis (along with the Wassermann test and the VDRL test).
A simplistic interpretation of the ratio has led to many false predictions of imminent "running out of oil" since the early years of the oil industry in the 1800s. This has been especially true in the United States, where the ratio of proved reserves-to-production has been between 8 years and 17 years since 1920.
RPR has some limitations and considerations, including: RPR deals with a single symptom at a time; RPR identifies the technical root cause of a problem, it can't be used to identify the non-technical root cause with people, process, etc. RPR is not a forensic technique and so historical data alone is rarely sufficient
Centers for Disease Control and Prevention (CDC)-approved standard tests include the VDRL test (a slide test), the rapid plasma reagin (RPR) test (a card test), the unheated serum reagin (USR) test, and the toluidine red unheated serum test (TRUST). [2] These have mostly replaced the first nontreponemal test, the Wassermann test. [citation needed]
Such tests can typically be read visually, which makes them fast, cost-effective, and able to be deployed in a wide variety of laboratory environments. The interpretation of any serological titer result is guided by reference values that are specific to the antigen or antibody in question, so a titer of 1:32 may be below the cut-off for one ...
RPR problem diagnosis, to find the cause of IT problems; RPRD2 gene, which encodes the KIAA0460 protein; RprA RNA, a gene; Flopristin or RPR 132552A, an antibiotic; Rapid plasma reagin, a screening test for syphilis
If the likelihood ratio for a test in a population is not clearly better than one, the test will not provide good evidence: the post-test probability will not be meaningfully different from the pretest probability. Knowing or estimating the likelihood ratio for a test in a population allows a clinician to better interpret the result. [7]