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MAGNETIC PROPERTIES OF FERRITE CORES UNDER DC - BIASED FIELD
H. Fukunaga,S. Masumoto,Y. Ohta,H. Kakehashi,H. Ogasawara 한국자기학회 1995 韓國磁氣學會誌 Vol.5 No.5
Ferrite cores are often magnetized under DC-biased field because they have been intensively used in electronic circuits such as an inverter circuit and a switching regulator circuit. Thus we investigated the effects of DC-biased field on magnetic properties in the frequency range of DC-100㎑ for two kinds of ferrite cores, TDK PC38 and TDK H₃S, which have different shapes of B-H loop from each other. The magnetic loss per cycle, W/f, in the H₃S core decreased with increasing the strength of DC-biased field, although W/f in the PC38 core increased monotonically with DC-biased field. The observed decreasing tendency differs from the previous result for Si-Fe and ferrite cores, and can be attributed to decrease in eddy current loss as well as that in hysteresis loss.
Ahmed M.H. Ali,Nazmul Hasan,Renkai Guo,Hiroto Ohta,Akinori Hirashima 한국응용곤충학회 2014 Journal of Asia-Pacific Entomology Vol.17 No.3
Octopamine (OA) and tyramine (TA) are biogenic amines that act as neurotransmitters, neurohormones, andneuromodulators in the invertebrate nervous system. Tyramine-β-hydroxylase (TβH) catalyzes the biosynthesisof OA from TA. In this study, cDNA encoding Bombyx mori TβH (BmTβH) was cloned from the brain of the silkwormB. mori. The BmTβH mRNA comprised 2204 nucleotide residues and contained an open reading frameencoding 592 amino acids. The deduced amino acid sequence shared homology to several proteins belongingto the insect TβH family. Functional expression of the cloned cDNA was obtained using a B. mori baculovirus expressionvector system. Western blot analysis revealed an immunoreactive band with a molecular mass of~67.4 kDa. Reverse-phase high-performance liquid chromatography (HPLC) was used to identify the productsformed during incubation of the enzyme reaction mixture. The optimumpH and temperature for the conversionof TA to OA were 7.5 and 25 °C, respectively. During incubation, the reaction was linear for the first 30 min at25 °C and pH 7.5. Inhibitory experiments carried out with various concentrations of an inhibitor showed thatthis method can be used for screening of BmTβH inhibitors.
TP53, MSH4, and LATS1 Germline Mutations in a Family with Clustering of Nervous System Tumors
Kim, Y.H.,Ohta, T.,Oh, J.E.,Le Calvez-Kelm, F.,McKay, J.,Voegele, C.,Durand, G.,Mittelbronn, M.,Kleihues, P.,Paulus, W.,Ohgaki, H. American Association of Pathologists and Bacteriol 2014 The American journal of pathology Vol.184 No.9
Exome DNA sequencing of blood samples from a Li-Fraumeni family with a TP53 germline mutation (codon 236 deletion) and multiple nervous system tumors revealed additional germline mutations. Missense mutations in the MSH4 DNA repair gene (c.2480T>A; p.I827N) were detected in three patients with gliomas (two anaplastic astrocytomas, two glioblastomas). Two family members without a TP53 germline mutation who developed peripheral schwannomas also carried the MSH4 germline mutation, and in addition, a germline mutation of the LATS1 gene (c.286C>T; p.R96W). LATS1 is a downstream mediator of the NF2, but has not previously been found to be related to schwannomas. We therefore screened the entire coding sequence of the LATS1 gene in 65 sporadic schwannomas, 12 neurofibroma/schwannoma hybrid tumors, and 4 cases of schwannomatosis. We only found a single base deletion at codon 827 (exon 5) in a spinal schwannoma, leading to a stop at codon 835 (c.2480delG; p.*R827Kfs*8). Mutational loss of LATS1 function may thus play a role in some inherited schwannomas, but only exceptionally in sporadic schwannomas. This is the first study reporting a germline MSH4 mutation. Since it was present in all patients, it may have contributed to the subsequent acquisition of TP53 and LATS1 germline mutations.
Mesonic and nonmesonic weak decay widths of medium-heavy <tex> $ \Lambda $</tex> hypernuclei
Sato, Y.,Ajimura, S.,Aoki, K.,Bhang, H.,Hasegawa, T.,Hashimoto, O.,Hotchi, H.,Kim, Y. D.,Kishimoto, T.,Maeda, K.,Noumi, H.,Ohta, Y.,Omata, K.,Outa, H.,Park, H.,Sekimoto, M.,Shibata, T.,Takahashi, T.,Y American Physical Society 2005 PHYSICAL REVIEW C - Vol.71 No.2