| radioimmunodiffusion | A method for the study of antigen-antibody reactions by gel diffusion using radioisotope-labelled antigen or antibody. (05 Mar 2000) |
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| radioimmunoelectrophoresis | Immunoelectro phoresis in which the antigen or antibody is labelled with a radioisotope; e.g., in testing for insulin-binding antibodies by treating the test serum with radioactive iodine-labelled insulin, subjecting the mixture (antigen) to electrophoresis, precipitating the separated immunoglobulins with immunoglobulin-specific antiserum, and, then, with radiosensitive film (autoradiography), testing for bound insulin in the precipitates. (05 Mar 2000) |
| radioimmunoprecipitation | Immunoprecipi tation utilizing a radioisotope-labelled antibody or antigen. (05 Mar 2000) |
| radioimmunoprecipitation assay | Sensitive assay using radiolabelled antigens to detect specific antibodies in serum. The antigens are allowed to react with the serum and then precipitated using a special reagent such as protein a sepharose beads. The bound radiolabelled immunoprecipitate is then commonly analyzed by gel electrophoresis. Radioimmunoprecipitation assay (ripa) is often used as a confirmatory test for diagnosing the presence of HIV antibodies. (12 Dec 1998) |
| radioimmunosorbent test | Radioimmunoassay of proteins using antibody coupled to an immunosorbent. (12 Dec 1998) |
| radioimmunotherapy | Radiotherapy where cytotoxic radionuclides are linked to antibodies in order to deliver toxins directly to tumour targets. Therapy with targeted radiation rather than antibody-targeted toxins (immunotoxins) has the advantage that adjacent tumour cells, which lack the appropriate antigenic determinants, can be destroyed by radiation cross-fire. Radioimmunotherapy is sometimes called targeted radiotherapy, but this latter term can also refer to radionuclides linked to non-immune molecules (see radiotherapy). (12 Dec 1998) |
| radioinsensitive | Not sensitive to X-rays and other forms of radiant energy. For example, a tumour may unfortunately be radioinsensitive. The opposite of radiosensitive. (12 Dec 1998) |
| radioiodinated | Treated or combined with radioiodine. (05 Mar 2000) |
| radioiodinated serum albumin | A sterile, buffered, isotonic solution prepared to contain not less than 10 mg of radioiodinated normal human serum albumin per ml, and adjusted to provide not more than 1 mCi of radioactivity per ml; used as a diagnostic aid in determining blood volume and cardiac output. Synonym: radioiodinated serum albumin. (05 Mar 2000) |
| radioiodine | A radioactive isotope of iodine. (An isotope is an alternate version of a chemical element that has a different atomic mass). Radioiodine can be used in diagnostic tests as well as in radiotherapy of the thyroid.for hyperthyroidism, radioiodine is administered in capsule form on a one-time basis. It directly radiates thyroid tissues thereby destroying them. It takes 8-12 weeks for the thyroid to become euthyroid (normal) after treatment. The majority of patients undergoing this treatment eventually become hypothyroid, which is easily treated using thyroid hormones (levothyroxine). Radioiodine is contraindicated during pregnancy and breast feeding. (12 Dec 1998) |
| radioiron | A radioactive isotope of iron; e.g., 59Fe. (05 Mar 2000) |
| radioisotope | <chemical, radiobiology> Form of a chemical element with unstable neutron number, so that it undergoes spontaneous nuclear disintegration. Major use in biology is to trace the fate of atoms or molecules that follow the same metabolic pathway or enzymic fate as the normal stable isotope, but that can be detected with high sensitivity by their emission of radiation. Also used to locate the position of the radioactive metabolite, as in autoradiography and to measure relative rates of synthesis of compounds from radioactive precursors. (18 Nov 1997) |
| radioisotope dilution technique | Method for assessing flow through a system by injection of a known quantity of radionuclide into the system and monitoring its concentration over time at a specific point in the system. (12 Dec 1998) |
| radioisotope renography | Graphic tracing over a time period of radioactivity measured externally over the kidneys following intravenous injection of a radionuclide which is taken up and excreted by the kidneys. (12 Dec 1998) |
| radioisotope teletherapy | A type of high-energy radiotherapy using a beam of gamma-radiation produced by a radioisotope source encapsulated within a teletherapy unit. (12 Dec 1998) |
Synonyms : Teletherapy, Radioisotope, Therapy, Teleradioisotope
Synonyms : Isotopes, Radioactive
Synonyms : Assay, Radioligand, Assay, Radioreceptor, Assays, Radioligand, Assays, Radioreceptor, Protein Binding Radioassay, Protein-Binding Radioassays, Radioassay, Protein-Binding, Radioassays, Protein-Binding, Radioligand Assays, Radioreceptor Assays
Synonyms : Health, Radiologic, Radiological Health, Health, Radiological
Synonyms :
| radiothanatology |
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| radioreceptor |
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| radiostrontium |
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| radiosurgery |
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| radiotelemetry |
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| RADIO | marine protozoa |
|---|---|
| RADIO | protozoa with amoeba-like bodies and radiating filamentous pseudopods |
| RADIO | locate by means of radar |
| RADIO | measuring instrument in which the echo of a pulse of microwave radiation is used to detect and locate distant objects |
| RADIO | a scientist trained in radiological technology |
| RADIO | of or relating to radiology |
| RADIO | a medical specialist who uses radioactive substances and X-rays in the treatment of disease |
| RADIO | examination of the inner structure of opaque objects using X rays or other penetrating radiation |
| RADIO | the branch of medical science dealing with the medical use of X-rays or other penetrating radiation |
| RADIO | almost complete transparent to X-rays or other forms of radiation |
| RADIO | molecular disintegration resulting from radiation |
| RADIO | meter to detect and measure radiant energy (electromagnetic or acoustic) |