S Morisawa

Summary

Affiliation: St. Marianna University School of Medicine
Country: Japan

Publications

  1. ncbi Fine structure of micropylar region during late oogenesis in eggs of the hagfish Eptatretus burgeri (Agnatha)
    S Morisawa
    Biological Laboratory, St Marianna University, School of Medicine, Miyamae, Kawasaki, Japan
    Dev Growth Differ 41:611-8. 1999
  2. ncbi Ultrastructural studies of late-stage spermatids and mature spermatozoa of the puffer fish, Takifugu niphobles (Tetraodontiformes) and the effects of osmolality on spermatozoan structure
    S Morisawa
    Biological Laboratory, St Marianna University, School of Medicine, Kawasaki, Japan
    Tissue Cell 33:78-85. 2001
  3. ncbi Acrosome reaction in spermatozoa from hagfish (Agnatha) Eptatretus burgeri and Eptatretus stouti: acrosomal exocytosis and identification of filamentous actin
    Sachiko Morisawa
    Biological Laboratory, St Marianna University, School of Medicine, 2 16 1 Sugao, Miyamae, Kawasaki 216 8511, Japan
    Dev Growth Differ 44:337-44. 2002
  4. ncbi Acrosome reaction in spermatozoa from the amphioxus Branchiostoma belcheri (Cephalochordata, Chordata)
    Sachiko Morisawa
    Department of Anatomy, St Marianna University, School of Medicine, Kawasaki, Japan
    Zoolog Sci 21:1079-84. 2004
  5. ncbi Spermiogenesis in the Hagfish Eptatretus burgeri (Agnatha)
    Sachiko Morisawa
    Division of Biology, Department of Anatomy, St Marianna University, School of Medicine, 2 16 1 Sugao, Miyamae, Kawasaki 216 8511, Japan
    Biol Bull 209:204-14. 2005
  6. ncbi Acrosome reaction in spermatozoa of the hagfish Eptatretus burgeri (Agnatha)
    S Morisawa
    Biological Laboratory, St Marianna University, School of Medicine, Miyamae, Kawasaki, Japan
    Dev Growth Differ 41:109-12. 1999

Collaborators

Detail Information

Publications6

  1. ncbi Fine structure of micropylar region during late oogenesis in eggs of the hagfish Eptatretus burgeri (Agnatha)
    S Morisawa
    Biological Laboratory, St Marianna University, School of Medicine, Miyamae, Kawasaki, Japan
    Dev Growth Differ 41:611-8. 1999
    ..A hypothesis that hagfish might show transitional structures in gametes from protochordates to teleosts is suggested...
  2. ncbi Ultrastructural studies of late-stage spermatids and mature spermatozoa of the puffer fish, Takifugu niphobles (Tetraodontiformes) and the effects of osmolality on spermatozoan structure
    S Morisawa
    Biological Laboratory, St Marianna University, School of Medicine, Kawasaki, Japan
    Tissue Cell 33:78-85. 2001
    ..Spermatozoa of marine fish may fertilize the eggs when the osmolality surrounding the sperm, which changes due to the mixing of seminal plasma and seawater, reaches the correct level for the spermatozoa to obtain correct structure...
  3. ncbi Acrosome reaction in spermatozoa from hagfish (Agnatha) Eptatretus burgeri and Eptatretus stouti: acrosomal exocytosis and identification of filamentous actin
    Sachiko Morisawa
    Biological Laboratory, St Marianna University, School of Medicine, 2 16 1 Sugao, Miyamae, Kawasaki 216 8511, Japan
    Dev Growth Differ 44:337-44. 2002
    ..It is phylogenetically interesting that such phenomena occur in spermatozoa of hagfish, a primitive vertebrate positioning between invertebrates and high vertebrates...
  4. ncbi Acrosome reaction in spermatozoa from the amphioxus Branchiostoma belcheri (Cephalochordata, Chordata)
    Sachiko Morisawa
    Department of Anatomy, St Marianna University, School of Medicine, Kawasaki, Japan
    Zoolog Sci 21:1079-84. 2004
    ..These observations suggest that the features and function of the acrosome of amphioxus, whose position is on the border between invertebrates and vertebrates, reflect their ecological adaptation and phylogenic position...
  5. ncbi Spermiogenesis in the Hagfish Eptatretus burgeri (Agnatha)
    Sachiko Morisawa
    Division of Biology, Department of Anatomy, St Marianna University, School of Medicine, 2 16 1 Sugao, Miyamae, Kawasaki 216 8511, Japan
    Biol Bull 209:204-14. 2005
    ..A droplet of cytoplasm was eliminated after descending along the flagella. The features of spermiogenesis in hagfish, which lies between invertebrates and vertebrates, are compared with those of other animals...
  6. ncbi Acrosome reaction in spermatozoa of the hagfish Eptatretus burgeri (Agnatha)
    S Morisawa
    Biological Laboratory, St Marianna University, School of Medicine, Miyamae, Kawasaki, Japan
    Dev Growth Differ 41:109-12. 1999
    ..The reaction bears resemblance to that of invertebrate spermatozoa rather than that of vertebrate spermatozoa. The result provides insights into the phylogenetical changes that have occurred in this sperm reaction...