title: Investigation on rice embryos and seeds after the LDEF flight:  electronic spin resonance identification.
abstract: Rice caryopsis of Cigalon variety with short grain of the LDEF mission can develop and grow as well as those of the laboratory control.  Rice caryopsis of Delta variety with long grain did not develop while a small number of excised embryos can develop and grow as well as the control group.  A preliminary study of the Electron Spin Resonance (ESR) spectra of Rice embryos and seeds recorded several month after the flight on flight samples and on control ones has been carried out.  All these samples had the same storage time.  During storage the radical concentration which usually decreases, now depends on irradiation doses and on whether or not they were delivered in presence of oxygen.  The signal variations are smaller than those usually observed in the different parts of the starch.  An estimation of a "gamma-equivalent-dose" can be reached.
authors.affiliation: Biologie Vegetale, Universite Montpellier II, France.
authors.forename: J F
authors.initials: JF
authors.lastname: Bayonove
authors.forename: J J
authors.initials: JJ
authors.lastname: Raffi
authors.forename: J P
authors.initials: JP
authors.lastname: Agnel
mesh_terms: D003359:Cosmic Radiation; D003470:Culture Media; D004578:Electron Spin Resonance Spectroscopy; D005609:Free Radicals; D005720:Gamma Rays; D012275:Oryza / Q000196:embryology / Q000254:growth & development* / Q000528:radiation effects; D010100:Oxygen; D011829:Radiation Dosage; D012639:Seeds / Q000254:growth & development / Q000528:radiation effects*; D013026:Space Flight; D018531:Spacecraft; D014867:Water
chemical_list: D003470:Culture Media; D005609:Free Radicals; D014867:Water; D010100:Oxygen