A5026466398- Bat Biology and Ecology Studies
- Physiological and biochemical adaptations
- Wildlife Ecology and Conservation
- Cancer therapeutics and mechanisms
- Chromosomal and Genetic Variations
- Insect and Arachnid Ecology and Behavior
- Vector-borne infectious diseases
- Cerebrovascular and Carotid Artery Diseases
- Peripheral Neuropathies and Disorders
- Neurogenetic and Muscular Disorders Research
- Reproductive Biology and Fertility
- Evolution and Paleontology Studies
- RNA regulation and disease
- Acute Myeloid Leukemia Research
- Synthesis and biological activity
- Cardiovascular Health and Disease Prevention
- Sperm and Testicular Function
- Viral Infections and Vectors
- Forest Insect Ecology and Management
- Neural and Behavioral Psychology Studies
- Insect and Pesticide Research
- Transcranial Magnetic Stimulation Studies
- Vascular Malformations Diagnosis and Treatment
- Muscle Physiology and Disorders
- Hereditary Neurological Disorders
Chiba University
2018-2025
Chiba University Hospital
2023
Fukuoka University
1977-2004
Jikei University School of Medicine
1994-1996
Osaka National Hospital
1996
Ito Hospital
1996
Neurological Surgery
1996
Saiseikai Kumamoto Hospital
1996
Kumamoto City Hospital
1996
Kumamoto University Hospital
1996
To quantitatively and noninvasively evaluate common carotid atherosclerosis in a series of patients, we measured the stiffness parameter beta, which represents mechanical properties vessel. beta was calculated from relationship between blood pressure diameter artery as by an ultrasonic, phase-locked, echotracking system. Increases severity grade subsequently determined at autopsy were correlated with increased values 60 arteries (r = .68). Patients greater than 13 had pathological diagnosis...
Copulation lasted for up to 46 min in little brown bats.Spermatozoa were stored both the uterus and utero-tubal junction, although intimate relationships between spermatozoa epithelium particularly evident established at beginning of period sperm storage.Poly- morphonuclear leucocytes present all uteri irrespective whether or not they had been inseminated but generally junction oviduct.Engulfment by epithelial cells polymorphonuclear uterine glands was soon after copulation.It is suggested...
Embryonic development in Japanese long-fingered bats proceeded very slowly during and after the delayed implantation period (mid-October to mid-December). The primitive amniotic cavity endoderm were formed before implantation. At preimplantation stage (before hibernation) corpus luteum cells appeared active, but became less active at (in hibernation). Activity was again apparent early placentation (after arousal).
Summary. In the Japanese long-fingered bat, Miniopterus schreibersii fuliginosus, spermatozoa in contact with microvilli of non-ciliated cells folds uterotubal junction appeared normal, while remaining uterus degenerated and were engulfed by a massive invasion polymorphonuclear leucocytes. No leucocytes seen area. It is suggested that this area are being stored, probably until ovulation occurs.
Only a very few spermatozoa were found in the ampulla of oviduct just after ovulation. The lost both acrosome cap and equatorial segment while passing between cumulus cells surrounding an ampullar egg; many such perivitelline space. One spermatozoon was seen contact with plasma membrane ovum metaphase second meiotic division. Excess space phagocytosed by pseudopodial protrusions from blastomere surface.
In the Japanese long-fingered bat, when compared with baseline values during non-pregnancy in autumn, plasma progesterone concentrations were not significantly elevated delayed implantation stage that begins before bats enter hibernation. However, lower development occurs hibernation and rose rapid embryogenesis after arousal from spring. Changes corpus luteum volume corresponded closely those of values. Maintenance gravid females at 25 degrees C for 2 weeks winter resulted significant...
After the mating season of Japanese greater horseshoe bat in mid-or late October, only right ovary maintained a single Graafian follicle throughout hibernation until early April.During this time ovum was prophase meiosis I (resting stage) with many large lipid droplets as nutrient source.In synchrony stigma formation, there resumption meiotic activity, separation cumulus oophorus from granulosa layer and dispersion cells just before ovula- tion spring.The block to polyspermy seemed reside...
Gravid female Japanese long-fingered bats were kept in captivity without hibernation at elevated temperatures (23-25 degrees C) winter. The embryonic growth rate was accelerated and consequently parturition advanced by a period equivalent to that of exclusion from as compared with the wild population. corpus luteum became active, indicated an increase 'light' lutein cells experimental bat pregnant 15-mm embryo, but less active (more 'dark' cells) 2 hibernating control implanting blastocyst.
Summary. In the Japanese long-fingered bat, Miniopterus schreibersii fuliginosus, ovulation occurred spontaneously with disappearance of granulosa layer and germinal epithelium at apex stigma which was formed simultaneously expulsion first polar body, subsequent bleeding from capillary lumina theca interna. After rupture point plugged by luteinizing cells overgrown newly regenerated tunica albuginea epithelium.
SUMMARYKaryological investigations of two Japanese Nyctalus species were made based on G- and C-banding pattern analysis. The karyotype N. furvus (2n = 44, FN 50) was similar to the standard Myotis species. On other hand, lasiopterus aviator 42, characterized by having an additional large metacentric pair. By comparison G-banding between species, it is clear that pair has derived from Robertsonian fusion pairs (nos. 8 10) furvus. There also a significant difference in amount constitutive...
Live spermatozoa were first stored in the colliculus tubaricus of uterotubal junction (UTJ) on both sides, Spermatozoa then ascended to caudal isthmus just before ovulation. with intact acrosomes isthmus, which had their heads orientated towards cephalic seen amongst groups epithelial cilia parallel epithelium; other hand, acrosome-less that not attached epithelium irregularly lumen. A few acrosome-intact found left ampulla at time ovulation single egg side. Most failed reach or survive...
The placentae of the Japanese long-fingered bat were characterized by their morphological and functional transition from main placenta to accessory placentae. transformed an endotheliodichorial a haemodichorial (one layer syncytiotrophoblast one cytotrophoblast cells) condition. Degeneration was accompanied development two These developed on both sides (fetal side) placenta, subsequently converted (two layers haemomonochorial