| DUF | Doppler ultrasonic flowmeter; drug use forecast |
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| PDUF | pulsed Doppler ultrasonic flowmeter |
| PUL | percutaneous ultrasonic lithotripsy |
| UA | absorption unsharpness; ultra-audible; ultrasonic arteriography; umbilical artery; unauthorized abse... |
| UCG | ultrasonic cardiography; urinary chorionic gonadotropin |
| materials recovery facility | A recycling facility for municipal solid waste. (05 Dec 1998) |
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| resource conservation and recovery act | (RCRA) A federal law regulating solid and hazardous waste. RCRA governs the generation, storage, treatment, transport, and disposal of hazardous waste. (05 Dec 1998) |
| creep recovery | The time-dependent portion of the decrease in strain in a material or object following removal of the stress that has deformed it. (05 Mar 2000) |
| product recovery | The process of separating a desired recombinant protein from the growth medium and the other elements in the host cells in which it was grown. (14 Nov 1997) |
| short TI inversion recovery | An inversion recovery sequence that uses a short inversion time, about 100 ms., between 180 |
| sinoatrial recovery time | <cardiology, physiology> Interval from the last paced P wave to the first succeeding spontaneous P wave (after 2 to 5 minutes of right atrial pacing at 120 to 140 beats per minute, and when expressed as percentage of control cycle length, it normally ranges from 115 to 159%). (05 Mar 2000) |
| spontaneous recovery | The return of the conditioned response, after apparent extinction, in the presence of the conditioned stimulus without the unconditioned stimulus also being present. See: classical conditioning. (05 Mar 2000) |
| supernormal recovery phase | A brief period during the recovery of cardiac muscle following excitation when diseased muscle is more (i.e., less abnormally) excitable; corresponds to the end of the T wave in the ECG. (05 Mar 2000) |
| inversion recovery | A magnetic resonance pulse sequence in which a series of 180 |
| fluorescence recovery after photobleaching | Many fluorochromes are bleached by exposure to exciting light. If, for example: the cell surface is labelled with a fluorescent probe and an area bleached by laser illumination, then the bleached patch that starts off as a dark area will gradually recover fluorescence. The recovery is due to the re population of the area by unbleached molecules and diffusion of bleached molecules to other areas. The rate and extent of recovery are a measure of the fluidity of the membrane and the proportion of labelled molecules that are free to exchange with adjacent areas. The technique is usually applied to cell surface fluidity or viscosity measurements, but is also applicable to other structures. (18 Nov 1997) |
| vitelline layer of egg | <zoology> The membrane, usually of protein fibres, immediately outside the plasmalemma of the ovum and the earlier stages of the developing embryo. Its structure and composition vary in differing animal groups. (18 Nov 1997) |
| centrolecithal egg | An egg in which the yolk is concentrated near the centre of the egg cell, as is the case in many of the insects. (05 Mar 2000) |
| microlecithal egg | An egg containing a small amount of deutoplasm. (05 Mar 2000) |
| mosaic egg | <biology> At one time a distinction was drawn between those organisms in which the egg seemed to have a firmly committed fate map built in and regulating embryos. In the former, after the first cleavage one blastomere was committed to produce one set of tissues, the other blastomere a different set and removal of one blastomere led to the production of an incomplete embryo. This was particularly obvious in mollusc development where one blastomere had the polar lobe material. This early differentiation (or determination) of blastomeres for particular fates was in distinction to regulating embryos in which the removal of one blastomere did not matter, the other blastomere compensating and producing a full set of tissues. The distinction is, however, only based upon the timing of differentiative events and within a few divisions the regulating embryo also becomes a mosaic of determined cells. (18 Nov 1997) |
| primary egg membrane | See: egg membrane. (05 Mar 2000) |