What's the difference between curve and directrix?

Curve


Definition:

  • (a.) Bent without angles; crooked; curved; as, a curve line; a curve surface.
  • (a.) A bending without angles; that which is bent; a flexure; as, a curve in a railway or canal.
  • (a.) A line described according to some low, and having no finite portion of it a straight line.
  • (a.) To bend; to crook; as, to curve a line; to curve a pipe; to cause to swerve from a straight course; as, to curve a ball in pitching it.
  • (v. i.) To bend or turn gradually from a given direction; as, the road curves to the right.

Example Sentences:

  • (1) As a consequence, similar response curves were obtained for urine specimens containing morphine or barbiturates.
  • (2) When the data correlating DHT with protein synthesis using both labelling techniques were combined, the curves were parallel and a strong correlation was noted between DHT and protein synthesis over a wide range of values (P less than 0.001).
  • (3) These observations were confirmed by the killing curves in pooled serum obtained at peak and trough levels.
  • (4) However, there was no statistically significant difference in mean areas under the LH and FSH curves in the GnRH-treated groups.
  • (5) Regression curves indicate that although all three types of pulmonary edema can be characterized by slightly different slopes, the differences are statistically insignificant.
  • (6) In the cannulated group, significant decreases (P less than 0.05) in the area under the elimination curve (AUC), the volume of distribution at steady-state (Vdss) and the mean residence time (MRT) were observed.
  • (7) The reproducibility of the killing-curve method suggests that at least two different concentrations should be used and that a decrease in viable counts below 2 log10 after 24 hours does not exclude a synergistic action.
  • (8) The curve of mitoses peaked at the same time as that of TK activity but was only 68% as extensive.
  • (9) The effect of these drugs was estimated from the cell growth curve and DNA histogram determined by flow cytometry.
  • (10) However, there was not a relationship between the contraction curve of the gallbladder and the bile flow into the duodenum.
  • (11) The total "dose" to the tissue of individual metabolites was determined by the area under the curve (AUC).
  • (12) However, those studies used partial maximal expiratory flow volume (PMEFV) curves to assess lung function.
  • (13) Blood gas variables produced from a computed in vivo oxygen dissociation curve, PaeO2, P95 and C(a-x)O2, were introduced in the University Hospital of Wales in 1986.
  • (14) They were more irregularly curved and consisted of various substances.
  • (15) The duration of action correlated with the elimination half-life of the drug (r = 0.87; P less than 0.003) and area under the plasma concentration curve (r = 0.72; P less than 0.03).
  • (16) The slope of the thermal inactivation curve of enterotoxin A in beef bouillon (initial pH 6.2) was found to be approximately 27.8 C (50 F) with three different concentrations of toxin.
  • (17) A relatively new method of estimating that date and constructing a corresponding Kaplan Meier curve is presented.
  • (18) To know the relation between the signal intensity and sodium concentration, sodium concentration--signal intensity curve was obtained using phantoms with various sodium concentrations (0.05-1.0%).
  • (19) In testing the contribution of the long, curved stem to the torsional stability of uncemented prostheses by comparing it with other stems, the long, curved stem was the most stable, followed by a shorter straight stem, and a short, proximally curved stem.
  • (20) After using the OK method to obtain a distance curve for height, we introduce a new method (VADK) to derive velocity and acceleration curves from the fitted distance curve.

Directrix


Definition:

  • (n.) A directress.
  • (n.) A line along which a point in another line moves, or which in any way governs the motion of the point and determines the position of the curve generated by it; the line along which the generatrix moves in generating a surface.
  • (n.) A straight line so situated with respect to a conic section that the distance of any point of the curve from it has a constant ratio to the distance of the same point from the focus.

Example Sentences: