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Recent Development in Embryo Technology in Pigs - Review -
Niwa, K.,Funahashi, H. Asian Australasian Association of Animal Productio 1999 Animal Bioscience Vol.12 No.6
Technologies on preimplantation porcine embryos have been developed quickly and significantly. Successful development of systems for culture of porcine zygotes to the blastocyst stage has made it possible to utilize follicular oocytes for in vitro production of embryos and thus stimulated research on various embryo technologies. Recent technological development of embryo cryopreservation, separation of X- and Y-bearing spermatozoa and non-surgical embryo transfer has also made it easy to utilize in vivo- and in vitro-produced embryos for artificial manipulation to produce clones and transgenic pigs. Further progress in overcoming various problems associated with each embryo technology will result in acceptable efficiency to utilize porcine embryos with a high or increased quality. Combining these technologies will accelerate further expansion of the swine industry not only for meat production but also for the production of therapeutic recombinant proteins and xonografts.
PROPOSAL OF COOPERATIVE STUDY TOWARD ESTABLISHING ASIACATALYST
Niwa, Miki 한국화학공학회 1997 Korean Journal of Chemical Engineering Vol.14 No.6
Cooperative studies on $quot;Reference Catalyst$quot; in Japan have proven to be very important and useful not only for characterization of catalysts but also for standardization of characterization techniques. This recognition has motivated us to propose $quot;Asiacatalyst$quot;, an extended version of Reference Catalyst, for similar cooperative activities in Asian countries.
Ryoko Niwa,Keisuke Takai,Makoto Taniguchi 대한척추신경외과학회 2021 Neurospine Vol.18 No.1
Objective: Although a retro-odontoid pseudotumor associated with rheumatoid arthritis is a well-known clinical entity, little is known about retro-odontoid pseudotumors not associated with rheumatoid arthritis due to their rarity. Methods: Between 2006 and 2019, consecutive patients with nonrheumatoid pseudotumors were included and retrospectively compared with patients with rheumatoid pseudotumors. Results: Nineteen patients had nonrheumatoid pseudotumors (mean age, 73±6 years; male, 53%). All had cervical lesions including ossified anterior and posterior longitudinal ligaments with a history of cervical surgery in 5. The mean thickness of the pseudotumors at diagnosis was 8.1 mm (range, 4.2–17.2 mm). Pseudotumor thickness had a significant negative correlation with the atlantodental interval (p=0.008) and the subaxial range of motion (p=0.049). In comparison with 7 rheumatoid pseudotumor patients, nonrheumatoid pseudotumor patients were older (p=0.042), had a higher proportion of males (p=0.023), had a smaller atlantodental interval (p=0.007), and had larger pseudotumors at diagnosis (p=0.030). Of the 19 patients, 18 received posterior fixation with or without C1 laminectomy, while the other received C1 laminectomy alone. The percent pseudotumor thickness at follow-up to those at diagnosis was 91%, 77%, 68%, 46%, 58%, and 49% at 1, 3, 6, 12, 24, and 36 months after surgery, respectively. Conclusion: This study revealed markedly clinical and radiological differences between nonrheumatoid and rheumatoid pseudotumors. The main etiology for nonrheumatoid pseudotumors was subaxial cervical degeneration and ossified lesions. There were good outcomes following posterior fixation and time-dependent pseudotumor regression within 12 months.
Ship-to-Ship Radiocommunication Trial by Using Wireless LAN
Yasuyuki NIWA,Hisaya MOTOGI,Chihiro NISHIZAKI,Misako URAKAMI,Takahiro SETA,Mitsuru KOBAYASHI,Makiko MINAMI 국제이네비해양경제학회 2015 International Journal of e-Navigation and Maritime Vol.3 No.1
Seamless transfer of electronic information/data between ship-to-shore and vice versa and between ship-to-ship and shore-to-shore is being developed in the IMO e-Navigation strategy implementation plan (SIP). We have been focused on wireless LAN for ship-to-ship radiocommunication. In a former field radiocommunication trial, omni-directional antennas were used and a few hundred kbps throughput between two ships was measured, which was not enough for our research target (over 1Mbps). In order to get faster throughput, a field radiocommunication trial was carried out again with a few types of directional antennas and RSSI (Received Signal Strength Indication) and the throughput between two ships was measured simultaneously. As a result, multi-path (2-path) model affected by the reflection of the sea surface was confirmed and also the characteristics of the directional antennas such as half-power angle were confirmed, but the measured throughput was fast enough to meet our expectation.