(n.) A kind of curve; one of the conic sections formed by the intersection of the surface of a cone with a plane parallel to one of its sides. It is a curve, any point of which is equally distant from a fixed point, called the focus, and a fixed straight line, called the directrix. See Focus.
(n.) One of a group of curves defined by the equation y = axn where n is a positive whole number or a positive fraction. For the cubical parabola n = 3; for the semicubical parabola n = /. See under Cubical, and Semicubical. The parabolas have infinite branches, but no rectilineal asymptotes.
Example Sentences:
(1) The major variation in these patterns can be modeled by families of parabolas with a single degree of freedom.
(2) The relation between concentration and absorption in an eight step calibration series is well described by a parabola of the 2nd degree.
(3) It was shown that the women used a parabola with a larger margin over the top of the hurdle than the men: A lower parabola would shorten the hurdle step, and would require the lengthening of the three interhurdle steps.
(4) Three to eight parabolas were averaged for subjects in each posture; the mean for each posture was calculated.
(5) It was found that the velocity profile of the FITC labelled RBC in straight microvessels was blunt as compared to a parabola.
(6) The "excitability ratio" is the first derivative of the response parabola and as such becomes a linear function of the actual arterial CO2 partial pressure.
(7) The equation of the resulting parabola, corresponding to the upper frontal arch, can be applied to every maxillary dimension.
(8) This increase is satisfactorily expressed by a cubic parabola.
(9) A not previously described relationship between HbA2 and total Hb was demonstrated and probably conformed to a second degree parabola.
(10) The shape of protrusive condyle path was like a section of parabola curved forward and downward.
(11) Evaluations of the arterial and venous bleeding were conducted at 3 rates x 3 parabolas, and capillary bleeding was evaluated with 5 parabolas x 2 methods (pig's foot and sponge).
(12) The flow velocity profile in the venule seems to deviate slightly from the Newtonian parabola.
(13) The concentration of factor VIIIa can be obtained from the quadratic coefficient of the equation describing the parabola.
(14) Pointing accuracy improved movement-to-movement but not parabola-to-parabola, indicating that prolonged exposure is needed for sustained adaptation.
(15) A "reference parabola" is introduced making the fluid pressure concept more understandable.
(16) Transcranial Doppler data with accompanying acceleration information were analyzed in three segments in each parabola.
(17) The following objectives are addressed in this study: 1) to discuss present techniques and two new radiographic measurement systems; 2) to establish mean, standard deviation, and normal range values for these measurement systems; 3) to determine if these measurements vary with foot size; and 4) to use the results to establish general guidelines for metatarsal parabola reconstruction.
(18) Reaction patterns of 90 cortical neurons to acetylcholine approximated by two parabolas have been divided on simple and complex.
(19) Each parabola included a period of 1.8 Gz, then approximately 20 seconds of weightlessness, and finally a period of 1.6 Gz; the cycle repeated almost immediately for the remainder of the set.
(20) The constant delta C model is explored and a physically more realistic model is advanced which allows for a temperature-dependent delta C which changes sign at some temperature within the range of stability of the native protein; delta G(T) then has the form of a skewed parabola.
Parabole
Definition:
(n.) Similitude; comparison.
Example Sentences:
(1) We had blind-folded subjects who were rotating at constant velocity make standardized head movements during the free-fall and high force phases of parabolic flight, and we measured both the characteristics of their horizontal nystagmus and the magnitude of their experienced self-motion.
(2) Twenty-one subjects flew aboard a KC-135 aircraft operated by the National Aeronautics and Space Administration (NASA) which performed parabolic maneuvers resulting in periods of 0-g, 1-g, and 1.8-g. Each subject flew once with a tablet containing scopolamine and once with a placebo in a random order, crossover design.
(3) There was a parabolic relationship between agent lipophilic-hydrophilic balance, measured as chromatographic Rm values, and ILSmax.
(4) The grouping structure, which prescribes the location of major tempo changes, and the parabolic timing function, which represents a natural manner of executing such changes, seem to be the two major constraints under which pianists are operating.
(5) A sigmoidal relationship, rather than the familiar parabolic relationship, best described the influence of lipophilicity on both conjunctival and corneal drug penetration.
(6) Two methods are proposed for the analysis of the resulting progress curve of nitroaniline formation in terms of zymogen-activation kinetics: a graphical transformation of the parabolic curve and transformation of the curve for nitroaniline production into a linear progress curve by the addition of a specific inhibitor of plasmin, bovine pancreatic trypsin inhibitor.
(7) Lineweaver-Burk plots for insulin as varied substrate were linear, whereas those for the thiol substrates were nonlinears: the plots for low molecular weight monothiols (GSH and mercaptoethanol) were parabolic; those for low molecular weight dithiols (dithiothreitol, dihydrolipoic acid, and 2,3-dimercaptopropanol) were apparently linear modified by substrate inhibition; and the plots for protein polythiols (reduced insulin A and B chains and reduced ribonuclease) were parabolic with superposed substrate inhibition.
(8) A review of previous research and hardware development, performed mostly in parabolic flight both in the Soviet Union and the U.S., reveals an interest in surgical chambers to prevent cabin atmosphere contamination.
(9) The effects of PRLs were parabolic, high doses of the hormones being less effective than low doses.
(10) Although this drive could be a consequence of a disorientation experienced by subjects undergoing parabolic flight or by astronauts, the phenomenon also supports the hypothesis of a tonic influence exerted by the otoliths on the postural and extra-ocular musculature in order to compensate for the downward pull by the gravitoinertial forces.
(11) Orally administered metoclopramide (REGLAN) at doses of 10 or 20 mg, 75 min prior to either stressful linear acceleration (parabolic flight) or cross-coupled accelerative semicircular canal stimulation in a rotating chair was evaluated for its ability to prevent emesis or nausea II, respectively.
(12) A third-order polynomial function would theoretically explain better than a linear relation or a parabolic fit the curved shape of experimentally obtained P-Q relationships.
(13) These values are situated on a look like parabolic curve (C) centered on a 26.13 mm or 27.2 mm l value according to anterior or posterior implants.
(14) The univariate analysis concerning the BMI for various age groups, the two sexes, and variable periods of follow-up has almost systematically showed a parabolic inverted J shaped relationship with minimal levels of risk for BMI values of 27-29 units.
(15) Left atrial and aortic root dimensions tended to show a parabolic relationship with birth weight, increments were reduced at higher birth weights (r = +0.92 and 0.85).
(16) Therefore, the velocity profile is "trapezoidal" rather than parabolic at all times during the pulsation period.
(17) The inhibitory activity is strongly dependent on the alkyl chain length of the alkoxy-substituent showing a typical quasi-parabolic dependence with maximum effect at 6-8 carbon atoms in the alkyl chain.
(18) To facilitate description of central field defects, enlargement of the central visual field by a parabolic, non-linear projection has been proposed.
(19) A highly significant reversed parabolic relationship was shown between the Rm values and the biliary excretion of the test compounds.
(20) Sections cut normal to the plane of the laminae do not show parabolic patterning.