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Goto, M.,Morio, T.,Kojima, E.,Nagano, Y.,Yamada, Y.,Horigane, A.,Yamada, H. Asian Australasian Association of Animal Productio 2000 Animal Bioscience Vol.13 No.9
Rumination behavior, in vivo digestibility of cell wall constituents, particle size reduction in the rumen, and retention time in the digestive tract of sheep were examined using rice and oat straw as roughage sources. The in sacco digestibility, rumen fermentation, and microbial population and internal adenosine 5-triphosphate (ATP) content were also determined under feeding conditions of high-roughage and high-concentrate diets. Chewing number and time in rumination behavior were higher with rice straw than with oat straw, while the in sacco and in vivo DMD of rice straw were consistently lower than those of oat straw. Rice straw also showed higher frequency of thinner and longer particles in the rumen contents and lower retention time in the whole digestive tract as compared to those of oat straw. Rice straw was more effective to maintain the ruminal pH than oat straw, being reflected in higher internal ATP content of large-type protozoa on the high- concentrate diet. Changes in the ruminal microflora by shifting from the low- to the high- concentrate diet were also different between rice and oat straw.
CO-CULTURE OF BOVINE EMBRYOS WITH CUMULUS CELLS
Goto, K.,Koba, M.,Takuma, Y.,Nakanishi, Y.,Ogawa, K. Asian Australasian Association of Animal Productio 1989 Animal Bioscience Vol.2 No.4
Bovine embryos/ova obtained from in-vitro fertilization were either co-cultured on a monolayer of bovine cumulus cells or cultured in medium alone. Embryos/ova co-cultured with cumulus cells developed to 8-cell (30.9%), morula (29.8%) and blastocyst stages (26.6%) after 3-4, 5-6, and 7-8 days of culture, respectively, while embryos/ova cultured in medium alone failed to develop beyond 8-cell (0-13.3%), morula (0-1.5%) and blastocyst stages (0%). The results of this study demonstrated the beneficial effect of cumulus cells on the development of bovine embryos.
Goto, K.,Kajihara, Y.,Kosaka, S.,Koba, M.,Nakanishi, Y.,Ogawa, K.,Oku, T.,Fujiyama, M.,Yoshida, Y. Asian Australasian Association of Animal Productio 1989 Animal Bioscience Vol.2 No.4
Bovine blastocysts were obtained by totally in-vitro technique and then transferred to recipient cows. Total of 15 calves (including 4 premature calves) were obtained from 11 recipients. Four calves were obtained from the transfers of fresh blastocysts and 9 calves were obtained from the transfers of frozen-thawed blastocysts. Two calves were obtained from the bisected fresh blastocyst. The males and 5 females were delivered. Birth weight of calves was within normal range except one female, and all calves appeared to be completely normal.
Goto, K.,Kajihara, Y.,Koba, M.,Nakanishi, Y.,Ogawa, K. Asian Australasian Association of Animal Productio 1988 Animal Bioscience Vol.1 No.3
Bovine blastocysts were obtained by in-vitro culture of embryos derived from in-vitro fertilization of oocytes matured in-vitro. These blastocysts and blastocysts from inseminated donors were bisected by a simple method (without a holding pipette) using a microblade operated by a micromanipulator. A pair of demi-embryos was transferred nonsurgically into each uterine horn of a recipient cow 6 or 8 days after estrus. Pregnancy resulted from the third transfer. Ultrasound examination done 52 days after estrus (46 days after transfer) confirmed the presence of at least one fetus in the each uterine horn. This is the first report to show the viability of bisected bovine blastocysts obtained from in-vitro culture of embryos derived from in-vitro fertilization of oocytes matured in-vitro. In addition, a simple method to bisect bovine embryos is described.
Design of a 4πLaBr_3(Ce) Spectrometer for Neutron Capture Cross Section Measurements
J. Goto,H. Harada,F. Kitatani,Y. Nagai,M. Oshima,M. Segawa,Y. Toh 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
A 4πLaBr_3(Ce) spectrometer was designed for the measurements of neutron capture cross sections using a prompt γ-ray spectroscopic method with a time-of-flight technique. An optimum configuration for the 4πLaBr_3(Ce) spectrometer was chosen from four possible configurations based on comparison of simulated performance and cost of construction. Further simulations were performed to demonstrate performance of the 4πLaBr_3(Ce) spectrometer.
Corrosion Fatigue Crack Initiation Life of Ship Structural Steel in Dilute Sulfuric Acids
Tanaka, Y .,Kobayashi, Y .,Goto, H . 대한금속재료학회(대한금속학회) 2001 METALS AND MATERIALS International Vol.7 No.4
This paper describes corrosion fatigue for notched specimens in dilute sulfuric acids. The acids are typical corrosion environments of condensate from coal vapor in a coal cargo hold. Fatigue data were consolidated as the relationships between the equivalent stress at a notch root and a fatigue crack initiation life. Life in dilute sulfuric acids was shorter than that in seawater because of the severe dissolution of iron. Long term corrosion fatigue was also estimated from the relationship between the stress intensity factor range to the fatigue crack initiation and the life. Corrosion wastage was considered as an estimate of the fatigue crack initiation life.
Simulation of a Polarimeter for a Spin - Polarized Positron Beam
J. H. Kim,F. Saito,N. Suzuki,L. Wei,Y. Nagashima,T. Kurihara,A. Goto,Y. Itoh,Y. S. Lee,T. Hyodo 한국진공학회(ASCT) 2002 Journal of Korean Vacuum Science & Technology Vol.6 No.3
A performance of a new positron polarimeter is investigated by simulation using a charged-particle trajectory program. The results of the ray tracing are presented along with the details of the design parameters and projected system performance. A ray tracing analysis indicates that this design is capable of effectively transmitting positrons at beam energies varying from 0.1 to 30 keV within the beam diameter of 2-6 ㎜. However, the observed reflection of the positrons(1ower than 2 keV) at 12 kGauss indicated that further refinement of beam design is needed to produce a better positron polarimeter.