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Rice bran is abundant in bioactive compounds including tocotrienol (T3, unsaturated vitamin E). T3 has been reported about its potential functionalities (i.e., antiangiogenic effect), so much attention has been paid on usability of rice bran T3. Hence, we developed a rapid screening method for T3-rich rice bran by one-step equilibrium direct solvent(More)
Sheath blight, caused by Rhizoctonia solani, is one of the most serious diseases of rice. Among 33 rice accessions, mainly from National Institute of Agrobiological Sciences (NIAS) Core Collection, we found three landraces from the Himalayas-Jarjan, Nepal 555 and Nepal 8-with resistance to sheath blight in 3 years' field testing. Backcrossed inbred lines(More)
Rice (Oryza sativa L.) can produce black grains as well as white. In black rice, the pericarp of the grain accumulates anthocyanin, which has antioxidant activity and is beneficial to human health. We developed a black rice introgression line in the genetic background of Oryza sativa L. 'Koshihikari', which is a leading variety in Japan. We used Oryza(More)
As rice bran tocotrienol (T3) has been known to have a wide range of physiological functions (e.g., antiangiogenesis), we aimed at developing a T3-rich rice variety for nutraceutical purposes. T3 content in more than 250 kinds of rice bran samples were investigated, and Milyang23 was found as the best variety rich in T3. The variety was therefore chosen for(More)
  • Y Kojima
  • 1991
The fine structure of acrosomic abnormalities such as fragmentation and vacuolization of boar spermatids was studied in 4 different breeds (Duroc, Hampshire, Landrace and Yorkshire). These abnormalities initially appeared from the cap phase of spermiogenesis. The acrosome did not consist of serial sac covering the hemispherical nucleus, but only of a large(More)
  • Y Kojima
  • 1992
The fine structure of intercellular bridge (ICB) of goat germ cells was studied using testicular samples fixed by perfusion. In the seminiferous tubules, the ICBs were observed between sister cells of spermatogonia, spermatocytes and spermatids. As a result of incomplete division of germ cells, the ICB first appeared as a midbody containing a remnant of the(More)
  • Y Kojima
  • 1994
During the morphological study of goat spermatogenesis, cross and oblique sections of the neck region (connecting piece) of the spermatid were closely studied in conjunction with the shaping of the sperm head; the centriolar adjunct (CA) briefly appeared as a fragile organelle in spermiogenesis. As is the case of other mammalian spermatids, the CA expanded(More)
  • Y Kojima
  • 1994
During the morphological study of goat spermatogenesis, an electron dense core was noticed in the microbody of the Sertoli cell in adult animals. By means of a goniometer apparatus fitted to the electron microscope, tilting 30 degrees unidirection, the dense core frequently displayed a characteristic checker pattern as a crystalloid or crystal. The size of(More)
  • Y Kojima
  • 1990
The fine structure of the spindle shape body (SSB) of boar spermatid was studied using testes samples fixed by perfusion. This structure appeared on the middle piece which served as the upper border of the fibrous sheath of principal piece during the transition period between the late acrosome phase to the maturation phase of spermiogenesis. The formation(More)