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Search Results: 1 - 10 of 50546 matches for " Y. Yamamuro "
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High-Pressure and Heat Pretreatment Effects on Rehydration and Quality of Sweet Potato
S. Abe,S.,Y. Yamamuro,K. Tau
American Journal of Food Technology , 2011,
Abstract: The effects of high-pressure and heat pretreatments, used prior to drying, on the rehydration rate and quality of sweet potato was investigated. Sweet potato was pressurized at 200 Mpa for 5 min and heat treatment was performed at 100°C for 5 min. Three different types of pretreatments were performed: heat treatment, heat treatment after high-pressure treatment and high-pressure treatment after heat treatment. There were no differences in the color parameters (L*, C* and h) and gelatinization rate of rehydrated sweet potato exposed to the three different pretreatments. However, heat treatment after high-pressure treatment resulted in pronounced texture improvement compared to the other pretreatments. The relative hardness of the rehydrated sweet potato exposed to heat treatment after high-pressure treatment was higher than with the other pretreatments. Furthermore, it was found that the rehydration rate of sweet potato exposed to heat treatment after high-pressure treatment was lower than either heat treatment or high-pressure treatment after heat treatment. Heat treatment after high-pressure treatment prior to drying prevented cubes of sweet potato from collapsing during rehydration. This study shows that in sweet potato, the use of heat treatment after high-pressure treatment prior to drying could serve as an effective method for texture improvement.
Two closure properties on the class of subexponential densities
Toshiro Watanabe,Kouji Yamamuro
Mathematics , 2015,
Abstract: Relations between subexponential densities and locally subexponential distributions are discussed. It is shown that the class of subexponential densities is neither closed under convolution roots nor closed under asymptotic equivalence. A remark is given on the closure under convolution roots for the class of convolution equivalent distributions.
Limsup behaviors of multi-dimensional selfsimilar processes with independent increments
Toshiro Watanabe,Kouji Yamamuro
Statistics , 2010,
Abstract: Laws of the iterated logarithm of "limsup" type are studied for multi-dimensional selfsimilar processes $\{X(t)\}$ with independent increments having exponent $H$. It is proved that, for any positive increasing function $g(t)$ with $\displaystyle \lim_{t\to\infty}g(t) = \infty$, there is $C\in [0,\infty]$ such that $\limsup|X(t)|/(t^Hg(|\log t|))= C$ a.s. as $t \to\infty $, in addition, as $t \to 0$. A necessary and sufficient condition for the existence of $g(t)$ with C=1 is obtained. In the case where $g(t)$ with C=1 does not exist, a criterion to classify functions $g(t)$ according to C=0 or $C=\infty$ is given. Moreover, various "limsup" type laws with identification of the positive constants $C$ are explicitly presented in several propositions and examples. The problems that exchange the roles of $\{X(t)\}$ and $g(t)$ are also discussed.
Changes in alkaline band formation and calcification of corticated charophyte Chara globularis
Chika Kawahata, Masumi Yamamuro and Yoshihiro Shiraiwa
SpringerPlus , 2013, DOI: 10.1186/2193-1801-2-85
Abstract: Calcification by charophytes improves the quality of water, although most studies on calcification have only examined ecorticate species. We investigated the formation and relationship of alkalines and acids with regard to calcification on internodal cells in Chara corallina, an ecorticate species, and Chara globularis, a corticate species. We observed that alkaline and acidic areas with distinct banding patterns form on the internodal cells of C. corallina. The entire periphery of internodal cells was alkalized, and no distinct acidic area developed in C. globularis. By electron microscopy of these internodal cells, the calcified areas occurred primarily in alkaline areas with a banding pattern in C. coralline. However, phenomenon also occurred homogeneously inside of the entire cortex and cell wall in C. globularis. We also investigated the formation and relatiohship of alkalines and acids with regard to calcification on internodal cells of various ages from a single thallus of C. globularis. For internodal cells of C. globularis, a uniform calcified area lay between the cell wall and cortex on all cells, irrespective of age. In contrast, young cells bore an alkaline area that was uniform and widespread throughout their entire periphery, but the alkaline area in older cells was split into smaller segments in a banding pattern. Acidic areas were absent in young cells. These results indicate that the mechanisms by which alkaline and acid areas form differ in the presence and absence of cortex and between species.
Maleylated-BSA induces TNF-α production through the ERK and NF-κB signaling pathways in murine RAW264.7 macrophages  [PDF]
Rui Tada, Yusuke Koide, Mitsuaki Yamamuro, Akira Hidaka, Koichiro Nagao, Yoichi Negishi, Yukihiko Aramaki
Open Journal of Immunology (OJI) , 2013, DOI: 10.4236/oji.2013.34023
Abstract: Ligands for macrophage scavenger receptors are reported to induce a wide range of host cell responses, including the production of inflammatory cytokines; however, the underlying mechanisms have not yet been fully understood and which remain obscure. In this study, we have examined the effect of maleylated bovine serum albumin (maleylated-BSA), a well-known ligand of the scavenger receptor, on the murine macrophage cell line RAW264.7. Maleylated-BSA strongly induced the production of tumor necrosis factor-α (TNF-α) and induced phosphorylation of extracellular signal-regulated kinase (ERK) and NF-kB p65. We also observed that maleylated-BSA-induced TNF-α production was blocked by the ERK inhibitor U0126. Together, these data demonstrates that maleylated-BSA- induced production of TNF-α requires the ERK/NF-κB signaling cascade in murine RAW- 264.7 macrophages.
The image slicer for the Subaru Telescope High Dispersion Spectrograph
Akito Tajitsu,Wako Aoki,Tomoyasu Yamamuro
Physics , 2012, DOI: 10.1093/pasj/64.4.77
Abstract: We report on the design, manufacturing, and performance of the image slicer for the High Dispersion Spectrograph (HDS) on the Subaru Telescope. This instrument is a Bowen-Walraven type image slicer providing five 0.3 arcsec x 1.5 arcsec images with a resolving power of R= 110,000. The resulting resolving power and line profiles are investigated in detail, including estimates of the defocusing effect on the resolving power. The throughput in the wavelength range from 400 to 700 nm is higher than 80%, thereby improving the efficiency of the spectrograph by a factor of 1.8 for 0.7 arcsec seeing.
A new equation of state for neutron star matter with nuclei in the crust and hyperons in the core
Tsuyoshi Miyatsu,Sachiko Yamamuro,Ken'ichiro Nakazato
Physics , 2013, DOI: 10.1088/0004-637X/777/1/4
Abstract: The equation of state for neutron stars in a wide-density range at zero temperature is constructed. The chiral quark-meson coupling model within relativistic Hartree-Fock approximation is adopted for uniform nuclear matter. The coupling constants are determined so as to reproduce the experimental data of atomic nuclei and hypernuclei. In the crust region, nuclei are taken into account within the Thomas-Fermi calculation. All octet baryons are considered in the core region, while only $\Xi^{-}$ appears in neutron stars. The resultant maximum mass of neutron stars is $1.95M_\odot$, which is consistent with the constraint from the recently observed massive pulsar, PSR J1614-2230.
Quantitative Assessment of Chronic Skin Reactions Including Erythema and Pigmentation after Breast Conserving Therapy  [PDF]
Miho Kawashima, Miwako Nozaki, Kazuhiro Komazaki, Ryuko Yamamuro, Kazuo Ishizuna, Makoto Kojima
Advances in Breast Cancer Research (ABCR) , 2016, DOI: 10.4236/abcr.2016.53014
Abstract: Purpose: To evaluate long-term skin reactions following breast-conserving therapy by using the melanin-erythema index meter. Patients and Methods: 164 patients were followed for at least three years after breast-conserving therapy. For both the erythema and the melanin indices, the ratio of the irradiated-side index to the non-irradiated-side index was calculated. The time course of index ratios alternation was examined. Influences from additional therapies and patients’ age were also evaluated. Result: Both erythema and melanin index ratios of the breast skin were recovered to pre-radiation level three years after radiotherapy. However, both index ratios of the area administrated with 10-Gy boost irradiation were still high even after five years after radiotherapy. Endocrine therapy, chemotherapy and age had no significant influence on skin color reactions three years after radiotherapy. Conclusion: Quantitative assessment using the melanin-erythema index meter demonstrated that chronic skin reactions following breast conserving therapy had recovered to pre-radiation level for three years after irradiation except for the 10-Gy boost irradiated area.
Synthesis of copper and zinc sulfide nanocrystals via thermolysis of the polymetallic thiolate cage
Toshihiro Kuzuya, Yutaka Tai, Saeki Yamamuro and Kenji Sumiyama
Science and Technology of Advanced Materials , 2005,
Abstract: In this paper report on the synthesis of copper and zinc sulfide nanocrystals (NCs) via the formation of polymetallic thiolate cages. Cu2S NCs derived from Cu–dodecanethiol complex formed well-defined spherers, which were sufficiently monodisperse (with a size distribution of ~10% standard deviation of approximately 4.7 nm diameter on average) to generate ordered self-assemblies. An electron diffraction pattern and UV–vis spectrum of Cu2S NCs indicate that this process can provide pure β-chalcocite (Cu2S). Nearly monodisperse ZnS NCs with a size ranging from 3 to 7 nm were obtained by thermolysis of the S–Zn–dodecanethiol precursor. The electron diffraction pattern indicates that zinc sulfide NCs are either wurtzite or a mixture of wurtzite and zincblende. TEM observation and UV–vis spectra revealed that the growth rate of ZnS NCs depends strongly on the annealing temperature. UV–vis spectra of 3 nm ZnS NCs show sharp excitonic features and a large blue shift from the bulk material. The photoluminescence spectra exhibit a large red shift from the absorption band edges. These shifts could be attributed to recombination from the surface traps. The narrow size distribution of Cu2S and ZnS NCs led to the formation of ordered self-assemblies with various well-defined but nonclosed-packing.
Metagenomic Analyses Reveal the Involvement of Syntrophic Consortia in Methanol/Electricity Conversion in Microbial Fuel Cells
Ayaka Yamamuro, Atsushi Kouzuma, Takashi Abe, Kazuya Watanabe
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0098425
Abstract: Methanol is widely used in industrial processes, and as such, is discharged in large quantities in wastewater. Microbial fuel cells (MFCs) have the potential to recover electric energy from organic pollutants in wastewater; however, the use of MFCs to generate electricity from methanol has not been reported. In the present study, we developed single-chamber MFCs that generated electricity from methanol at the maximum power density of 220 mW m?2 (based on the projected area of the anode). In order to reveal how microbes generate electricity from methanol, pyrosequencing of 16S rRNA-gene amplicons and Illumina shotgun sequencing of metagenome were conducted. The pyrosequencing detected in abundance Dysgonomonas, Sporomusa, and Desulfovibrio in the electrolyte and anode and cathode biofilms, while Geobacter was detected only in the anode biofilm. Based on known physiological properties of these bacteria, it is considered that Sporomusa converts methanol into acetate, which is then utilized by Geobacter to generate electricity. This speculation is supported by results of shotgun metagenomics of the anode-biofilm microbes, which reconstructed relevant catabolic pathways in these bacteria. These results suggest that methanol is anaerobically catabolized by syntrophic bacterial consortia with electrodes as electron acceptors.
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