섬유

cottonseed oil estimation by pulsed nuclear magnetic resonance technique

  • 출판일1999.03
  • 저자
  • 서지사항
  • 등록일 2016.11.02
  • 조회수 222
seed asymmetry and moisture associated with the seeds are known to affect seed oil estimation by pulsed nuclear magnetic resonance (nmr) technique employing free induction decay or single spin echo (se) pulse sequence. using gossypium (cottonseeds) as experimental material, it is shown that transverse relaxation times (t//2) of seed oil, in different varieties of seeds, measured in vivo, are not the same. the mean t//2 value of tetraploid seeds is found to be significantly higher than that of diploids. the effect of t//2 variation and other problems on oil estimation by the free induction decay and se methods can be avoided by using the carr-purcell-meiboom-gill (cpmg) pulse sequence to monitor the signal intensities of a certain number of selected echoes and processing them to yield the extrapolated signal intensity at zero time. 17 refs
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