What's the difference between precessional and recessional?
Precessional
Definition:
(a.) Of or pertaining to pression; as, the precessional movement of the equinoxes.
Example Sentences:
(1) It incorporates a stepping motor to drive the photomultiplier, two analog-to-digital converters, and a device which monitors precessional movement of the rotor.
(2) The increase of precessional motion of choline head by the inhalation anesthetic is apparently responsible for the changes.
(3) 31P NMR spectra of calf lens homogenates were obtained at 10 and 18 degrees C (below and above the cold cataract phase transition temperature, respectively) at 7.05 T. Effective rotational correlation times (tau 0,eff) for the major phosphorus metabolites present in cortical and nuclear bovine calf lens homogenates were derived from nonlinear least-squares analysis of R vs omega e (spectral intensity ratio vs precessional frequency about the effective field) data with the assumption of isotropic reorientational motion.
(4) Both CSF pulsation flow phenomena occurred secondary to harmonic modulation of proton precessional phase (temporal phase shift) by the unique pulsatile motion of spinal CSF when the repetition time was not an integral multiple of the pulsation period.
(5) Physiologic cerebrospinal fluid (CSF) pulsation causes a harmonic modulation of proton precessional phase with two-dimensional Fourier transform (2DFT) imaging, which results in predictable regions of signal loss and the presence of phase-shift images ("ghost images").
(6) Space group (P6322), parameters of the cell a-b-132 A, c = 122 A and distribution of spot intensities on precessional X-ray patterns were in full agreement with corresponding parameters for leucinaminopeptidase crystals from bovine eye lens.
Recessional
Definition:
(a.) Of or pertaining to recession or withdrawal.
Example Sentences:
(1) The Recessional Organ Music will be C. M. Widor’s Toccata from Symphony No 5.
(2) Poor results in two wrists were upgraded to good after osteosynthesis of a nonunion in one and recessional osteotomy of the radial sigmoid notch in the other.