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Ushida, Kazunari,Hashizume, Kenta,Miyazaki, Kohji,Kojima, Yoichi,Takakuwa, Susumu Asian Australasian Association of Animal Productio 2003 Animal Bioscience Vol.16 No.12
Fecal malodor is an acute environmental issue to be solved for the intensive animal agriculture in Japan. Among these substances volatile sulfur such as hydrogen sulfide (HS), methanethiol, and dimethyl sulfide, and dimethyl disulfide are the ones most strictly controlled in the Japanese national regulations. In this experiment, we have screened a range of standard strains of chemoheterotrophic bacteria and of the presently isolated soil bacteria for their capacity to decompose HS. We have demonstrated that Comamonas testosteroni $JCM5832^T$ and our isolate Bacillus sp. had a potential to reduce malodor when applied to the pig feces.
Role and Potential of Ruminal Fungi in Fiber Digestion - Review -
Ushida, K.,Matsui, H.,Fujino, Yuko,Ha, J.K. Asian Australasian Association of Animal Productio 1997 Animal Bioscience Vol.10 No.6
Anaerobic chytridiomycete fungi are now well recognized as one of the major components of rumen microflora. Since the discovery of anaerobic fungi, the knowledge upon their morphology and physiology has been accumulated. It is certain that they gave roles in ruminal fiber digestion, although their quantitative contribution to rumen digestion is still unclear. Their role in fiber digestion is complicated by the dietary factors and the interaction with other microorganisms. We aim at reviewing such information in this article. Considerable attention gas been paid to the polysaccharidase of these fungi. Analysis on the fungal genes encoding these enzymes has been performed in several laboratories. This article also covers the genetical analysis of fungal polysaccharidases.
EFFECT OF PLANT PHENOLIC ACIDS ON CELLULOLYTIC ACTIVITY OF MIXED RUMEN POPULATIONS
Ushida, K.,Watase, H.,Kojima, Y. Asian Australasian Association of Animal Productio 1990 Animal Bioscience Vol.3 No.1
Influences of plant phenolic acids and their possible metabolites(non-phenolic aromatic acids involved) in the rumen on the cellulolytic activity of mixed rumen populations were examined by a simple in vitro culture technique. Initial concentrations of aromatic acids were 1, 5, 10 and 20 mM/l. All the tested aromatic acids reduced microbial cellulose digestion especially at the higher initial concentration. P-Coumaric acid, ferulic acid and cinnamic acid, those having unhydrogenated propenoic side chain were more inhibitory than were 3-phenylpropinic acid and phloretic acid, those having hydrogenated propanoic side chain. Lag-time for cellulose digestion was prolonged by former three acids by 16 h. Apparent reduction in p-coumaric acid concentration was observed at 24 h when cellulose digestion began. Volatile fatty acid productions from cellulose fermentation were shifted by former three aromatic acids to produce more acetate and less propionate. This suggests that the selection of celluloytic organisms was induced by these aromatic acids.
Cross Sections for Neutrino Production of Charmed Particles
Ushida, N.,Park, I.G.,Song, J.S.,Bahk, S.Y.,Kim, C.O.,Park, J.N. 慶尙大學校 기초과학연구소 1988 基礎科學硏究所報 Vol.4 No.-
We have found 122 charmed - particle decays among 3855 neutrino interactions located in the fiducial volume of a hybrid emulsion spectrometer installed in the Fermilab wide-band neutrino beam.
Production Characteristics of Charmed Particles in Neutrino Interactions
Ushida, N.,Park, I.G.,Song, J.S.,Bahk, S.Y.,Kim, C.O.,Park, J.N. 慶尙大學校 기초과학연구소 1988 基礎科學硏究所報 Vol.4 No.-
Using a hybrid emulsion spectrometer installed in the Fermilab wide-band neutrino beam, we located a total of 3888 neutrino interactions in the fiducial volume of our target. For 122 charmed-particle decays found in these interactions. we present distributions of x, y charm-muon angular projection. Feynman- X, and the fragmentation Z. We find that the number of strange quarks in the nucleon sea is 4.2±2.1±2.6% of the number of down quarks.
Characteristics Curve of Nonlinear Resistive Circuits and its Stability
Ushida, Akio,Jiang, Lingge,Nishio, Yoshifumi 대한전자공학회 1996 APCCAS:Asia Pacific Conference on Circuits And Sys Vol.1 No.1
Distinguishing the stability of characteristic curves for nonlinear resistive circuits is requirement and importance to design various electronic circuit exactly. Since every resistive element has a parasitic component, solutions on the characteristic curves are stable or unstable. In this paper, we show that the stability will be mainly changed at the bifurcation points such as limit point and branch point. Applying the curve tracing method, we can decide the unstable regions on characteristic curves by the locations of bifurcation points.