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Search Results: 1 - 10 of 260 matches for " Atsushiba Sachiko "
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Weak and strong convergence theorems for nonexpansive semigroups in Banach spaces
Atsushiba Sachiko,Takahashi Wataru
Fixed Point Theory and Applications , 2005,
Abstract: We introduce an implicit iterative process for a nonexpansive semigroup and then we prove a weak convergence theorem for the nonexpansive semigroup in a uniformly convex Banach space which satisfies Opial's condition. Further, we discuss the strong convergence of the implicit iterative process.
Weak and strong convergence theorems for nonexpansive semigroups in Banach spaces
Sachiko Atsushiba,Wataru Takahashi
Fixed Point Theory and Applications , 2005, DOI: 10.1155/fpta.2005.343
Abstract: We introduce an implicit iterative process for a nonexpansive semigroup and then we prove a weak convergence theorem for the nonexpansive semigroup in a uniformly convex Banach space which satisfies Opial's condition. Further, we discuss the strong convergence of the implicit iterative process.
Bacterial ArtA protein specifically binds to the internal region of IS1 in vitro  [PDF]
Sachiko Matsutani
Advances in Bioscience and Biotechnology (ABB) , 2012, DOI: 10.4236/abb.2012.37108
Abstract: The internal region of bacterial translocatable IS1 acts as a cis-element to stimulate transcription from the various promoters located upstream. The product of the artA gene is genetically shown to stimulate transcription with the cis-element. Here, a codon-optimized artA gene was synthesized and cloned to express the ArtA protein. ArtA was purified as the Histagged protein. Nitrocellulose filter binding assay showed that ArtA specifically binds to the IS1 internal region. Electrophoretic mobility shift assay also showed specific binding of ArtA to the IS1 internal region. These results imply that ArtA directly binds to the IS1 internal region and stimulates transcription.
Effect of Dehydrated Digested Effluent of Manure on Yield and Quality of Annual Forages and Soil Chemical Properties in Southern Kyushu, Japan  [PDF]
Sachiko Idota, Yasuyuki Ishii
Agricultural Sciences (AS) , 2014, DOI: 10.4236/as.2014.510090
Abstract:

Digested effluent of manure (DEM) produced by biogas-plants contains many macro- and micro-nutrients. In an experiment conducted in southern Kyushu (Japan), forage crops cultivated after receiving DEM and chemical fertilizers exhibited similar dry matter yields. From a logistical standpoint, however, DEM in liquid form is difficult to handle and apply due to the low concentration of nutrients. To overcome this shortcoming, we prepared dehydrated DEM (DDEM) by adding DEM to cattle manure without disturbing the manure fermentation process. The objective of this research was to evaluate the effect of DDEM on dry matter yield and nitrogen recovery rate in annual dual-cropping systems (summer crop of maize or sorghum and winter crop of Italian ryegrass) that are typical of the region and to compare these results to commercial cattle manure alone, in combination with chemical fertilizer (CM or CM + CF), or no fertilizer application (NF). In both cropping systems, the DDEM treatment produced similar dry matter yields (2.6 to 3.02 kg·m-2) and apparent nitrogen recovery rates (43% to 53%) as the CM + CF and CM treatments. This suggests that DDEM can potentially replace chemical fertilizers and commercial cattle manure in the region.

Links Between Repeated Sequences
Sachiko Matsutani
Journal of Biomedicine and Biotechnology , 2006, DOI: 10.1155/jbb/2006/13569
Abstract: L1 and Alu elements are long and short interspersed retrotransposable elements (LINEs and SINEs) in humans, respectively. Proteins encoded in the autonomous L1 mediate retrotransposition of the nonautonomous Alu and cellular mRNAs. Alu is the only active SINE in the human genome and is derived from 7SL RNA of signal recognition particle. In the other eukaryotic genomes, various tRNA- and 5S rRNA-derived SINEs are found. Some of the tRNA- and 5S rRNA-derived SINEs have partner LINEs of which 3' sequences are similar to those of the SINEs. One of the tRNA-derived SINEs is shown to be mobilized by its partner LINE. Many copies of tRNA and 5S rRNA pseudogenes are present in the human genome. These pseudogenes may have been generated via the retrotransposition process using L1 proteins. Although there are no sequence similarities between L1 and Alu, L1 functionally links with Alu and even cellular genes, impacting on our genome shaping.
Secondary Leukemia Associated with the Anti-Cancer Agent, Etoposide, a Topoisomerase II Inhibitor
Sachiko Ezoe
International Journal of Environmental Research and Public Health , 2012, DOI: 10.3390/ijerph9072444
Abstract: Etoposide is an anticancer agent, which is successfully and extensively used in treatments for various types of cancers in children and adults. However, due to the increases in survival and overall cure rate of cancer patients, interest has arisen on the potential risk of this agent for therapy-related secondary leukemia. Topoisomerase II inhibitors, including etoposide and teniposide, frequently cause rearrangements involving the mixed lineage leukemia ( MLL) gene on chromosome 11q23, which is associated with secondary leukemia. The prognosis is extremely poor for leukemias associated with rearrangements in the MLL gene, including etoposide-related secondary leukemias. It is of great importance to gain precise knowledge of the clinical aspects of these diseases and the mechanism underlying the leukemogenesis induced by this agent to ensure correct assessments of current and future therapy strategies. Here, I will review current knowledge regarding the clinical aspects of etoposide-related secondary leukemia, some probable mechanisms, and strategies for treating etoposide-induced leukemia.
Similarities in transcription factor IIIC subunits that bind to the posterior regions of internal promoters for RNA polymerase III
Sachiko Matsutani
BMC Evolutionary Biology , 2004, DOI: 10.1186/1471-2148-4-26
Abstract: Here, I reported the results of PSI-BLAST searches using the B-block binding subunits of human and Shizosacchromyces pombe as queries, showing that the same Arabidopsis proteins were hit with low E-values in both searches. Comparison of the convergent iterative alignments obtained by these PSI-BLAST searches revealed that the vertebrate, yeast, and Arabidopsis proteins have similarities in their N-terminal one-third regions. In these regions, there were three domains with conserved sequence similarities, one located in the N-terminal end region. The N-terminal end region of the B-block binding subunit of Saccharomyces cerevisiae is tentatively identified as a HMG box, which is the DNA binding motif. Although I compared the alignment of the N-terminal end regions of the B-block binding subunits, and their homologs, with that of the HMG boxes, it is not clear whether they are related.Molecular phylogenetic analyses using the small subunit rRNA and ubiquitous proteins like actin and α-tubulin, show that fungi are more closely related to animals than either is to plants. Interestingly, the results obtained in this study show that, with respect to the B-block binding subunits of TFIIICs, animals appear to be evolutionarily closer to plants than to fungi.Phylogenetic relationships among animals, fungi, and plants have been a controversial issue. Although fungi traditionally had been considered more closely related to plants than to animals, Whittaker and Margulis [1] classified the fungi as a separate kingdom in their five-kingdom classification: the three major multicellular groups of animals, fungi, and green plants were each given the status of kingdoms derived from different protistan lineages of uncertain affinities. With the determination of the primary structures of homologous macromolecules in various organisms, spanning several kingdoms, molecular phylogenetic techniques resulted in new hypotheses about the relationships among eukaryotes. Small subunit rRNA, and
Links Between Repeated Sequences
Sachiko Matsutani
Journal of Biomedicine and Biotechnology , 2006,
Abstract: L1 and Alu elements are long and short interspersed retrotransposable elements (LINEs and SINEs) in humans, respectively. Proteins encoded in the autonomous L1 mediate retrotransposition of the nonautonomous Alu and cellular mRNAs. Alu is the only active SINE in the human genome and is derived from 7SL RNA of signal recognition particle. In the other eukaryotic genomes, various tRNA- and 5S rRNA-derived SINEs are found. Some of the tRNA- and 5S rRNA-derived SINEs have partner LINEs of which 3' sequences are similar to those of the SINEs. One of the tRNA-derived SINEs is shown to be mobilized by its partner LINE. Many copies of tRNA and 5S rRNA pseudogenes are present in the human genome. These pseudogenes may have been generated via the retrotransposition process using L1 proteins. Although there are no sequence similarities between L1 and Alu, L1 functionally links with Alu and even cellular genes, impacting on our genome shaping.
The Role of ATP in Sleep Regulation
Sachiko Chikahisa
Frontiers in Neurology , 2011, DOI: 10.3389/fneur.2011.00087
Abstract: One of the functions of sleep is to maintain energy balance in the brain. There are a variety of hypotheses related to how metabolic pathways interact with sleep/wake regulation. A major finding that demonstrates an interaction between sleep and metabolic homeostasis is the involvement of adenosine in sleep homeostasis. An accumulation of adenosine is supplied from ATP, which can act as an energy currency in the cell. Extracellularly, ATP can act as an activity-dependent signaling molecule, especially in regard to communication between neurons and glia, including astrocytes. Furthermore, the intracellular AMP/ATP ratio controls the activity of AMP-activated protein kinase, which is a potent energy regulator and is recently reported to play a role in the regulation of sleep homeostasis. Brain ATP may support multiple functions in the regulation of the sleep/wake cycle and sleep homeostasis.
Spin-Orbit Force of Instanton-Induced Interaction in Strange and Charmed Systems
Sachiko Takeuchi
Physics , 1998, DOI: 10.1016/S0375-9474(98)00539-9
Abstract: Effects of the spin orbit-force on hadronic systems with strangeness or charm are investigated by a valence quark model with the instanton-induced interaction. By introducing this interaction, the spin-orbit splittings in the negative-parity hyperons becomes 0.14 -- 0.37 times smaller. The flavor-octet baryon mass spectrum and the splittings in the charmed baryons become consistent with the experiments. Though the splitting is also reduced in the flavor-singlet baryons, it still gives two third of the experimental value. The reduction comes from the cancellation between the one-gluon exchange and the instanton-induced interaction, which is channel-specific. In most of the two-baryon channels, the symmetric and antisymmetric spin-orbit force of the YN interaction remains strong after introducing this instanton effect. A few exceptional channels, however, are found where the cancellation affects strongly and the spin-orbit force becomes small.
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