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Kaoru Yamashita,Akira Tsuchitani,Hideyuki Murakami,Masanori Okuyama,Shigeru Arita,Tsunehisa Tanaka,Yaowu Mo,Yoshihiko Suzuki 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.IV
Arrayed ultrasonic microsensors using piezoelectric PZT (Pb(Zr,Ti)O3) thin lms on micromachined silicon diaphragms have been fabricated and combined with BBD (Backet Brigade Device) for signal processing. The ultrasonic sensors are designed to compose an electrical phased array for three-dimensional object detection in air. The resonant frequencies of the elements were scattered in the error range of 12 % and the objects could not be detected due to the beat in the sum of delayed element waveforms. Each element has been tuned by adequate poling less than 10 V to make its resonant frequency equal to a center value. The frequency scattering was reduced within the range of 2 % and the tuned array could give the objects by summing up of the delayed signals. Three-dimensional object detection has been demonstrated using the tuned sensor combined with the BBD delay circuit.4
Matsumoto, Takahiro,Ohkubo, Kei,Honda, Kaoru,Yazawa, Akiko,Furutachi, Hideki,Fujinami, Shuhei,Fukuzumi, Shunichi,Suzuki, Masatatsu American Chemical Society 2009 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.131 No.26
<P>A (mu-eta(2):eta(2)-peroxo)dicopper(II) complex, [Cu(2)(H-L)(O(2))](2+) (1-O(2)), supported by the dinucleating ligand 1,3-bis[bis(6-methyl-2-pyridylmethyl)aminomethyl]benzene (H-L) is capable of initiating C-H bond activation of a variety of external aliphatic substrates (SH(n)): 10-methyl-9,10-dihydroacridine (AcrH(2)), 1,4-cyclohexadiene (1,4-CHD), 9,10-dihydroanthracene (9,10-DHA), fluorene, tetralin, toluene, and tetrahydrofuran (THF), which have C-H bond dissociation energies (BDEs) ranging from approximately 75 kcal mol(-1) for 1,4-CHD to approximately 92 kcal mol(-1) for THF. Oxidation of SH(n) afforded a variety of oxidation products, such as dehydrogenation products (SH((n-2))), hydroxylated and further-oxidized products (SH((n-1))OH and SH((n-2))=O), dimers formed by coupling between substrates (H((n-1))S-SH((n-1))) and between substrate and H-L (H-L-SH((n-1))). Kinetic studies of the oxidation of the substrates initiated by 1-O(2) in acetone at -70 degrees C revealed that there is a linear correlation between the logarithms of the rate constants for oxidation of the C-H bonds of the substrates and their BDEs, except for THF. The combination of this correlation and the relatively large deuterium kinetic isotope effects (KIEs), k(2)(H)/k(2)(D) (13 for 9,10-DHA, approximately > 29 for toluene, and approximately 34 for THF at -70 degrees C and approximately 9 for AcrH(2) at -94 degrees C) indicates that H-atom transfer (HAT) from SH(n) (SD(n)) is the rate-determining step. Kinetic studies of the oxidation of SH(n) by cumylperoxyl radical showed a correlation similar to that observed for 1-O(2), indicating that the reactivity of 1-O(2) is similar to that of cumylperoxyl radical. Thus, 1-O(2) is capable of initiating a wide range of oxidation reactions, including oxidation of aliphatic C-H bonds having BDEs from approximately 75 to approximately 92 kcal mol(-1), hydroxylation of the m-xylyl linker of H-L, and epoxidation of styrene (Matsumoto, T.; et al. J. Am. Chem. Soc. 2006, 128, 3874).</P>
Prognostic value of neutrophil-to-lymphocyte ratio in early-stage ovarian clear-cell carcinoma
Kosuke Yoshida,Nobuhisa Yoshikawa,Akira Shirakawa,Kaoru Niimi,Shiro Suzuki,Hiroaki Kajiyama,Fumitaka Kikkawa 대한부인종양학회 2019 Journal of Gynecologic Oncology Vol.30 No.6
Objectives: There is increasing evidence that systemic inflammatory response (SIR) markersare prognostic factors for various types of cancers. This is the first study to evaluate theusefulness of SIR markers for the prognosis of early-stage ovarian clear-cell carcinoma (OCCC). Methods: We retrospectively investigated 83 patients diagnosed with stage I–II OCCC whounderwent surgery between 2005 and 2017. Initially, receiver operating characteristic curveanalysis for overall survival (OS) was used to determine optimal cut-off values for neutrophilto-lymphocyte ratio (NLR) and platelet-to-lymphocyte ratio (PLR). Patients were stratifiedinto 2 groups by the cut-off values (NLR=3.26, PLR=160). Univariate and multivariateanalyses were performed to elucidate the significance of SIR markers as prognostic factors. Results: In the median follow-up period of 64.1 months, 16 patients experienced recurrence,and nine patients died. The Kaplan-Meier curve showed that OS of the NLR-low group wassignificantly longer than the NLR-high group (p=0.021). There was no significant differencein progression-free survival between the 2 groups (p=0.668), but the post-recurrencesurvival of the NLR-low group was significantly longer than the NLR-high group (p=0.019). Furthermore, multivariate analysis showed that increase in NLR is a significant independentprognostic factor for poor prognosis (hazard ratio=7.437, p=0.017). There was no significantdifference between PLR-low and PLR-high group. Conclusion: Results suggest that NLR can be a significant independent prognostic factor forearly-stage OCCC.
Hiroaki Kajiyama,Kiyosumi Shibata,Mika Mizuno,Tomokazu Umezu,Shiro Suzuki,Ryuichiro Sekiya,Kaoru Niimi,Hiroko Mitsui,Eiko Yamamoto,Michiyasu Kawai,Tetsuro Nagasaka,Fumitaka Kikkawa 대한부인종양학회 2014 Journal of Gynecologic Oncology Vol.25 No.1
Objective: This study was conducted to examine the effects of front-line chemotherapy on overall survival (OS) and postrecurrence survival (PRS) of patients with recurrent ovarian cancer, when stratifying the histologic type. Methods: Five hundred and seventy-four patients with recurrent ovarian cancer with sufficient clinical information, including front-line chemotherapy, were analyzed. The pathologic slides were evaluated by central pathologic review. The patients were divided into two groups: group A (n=261), who underwent taxane plus platinum, and group B (n=313), who underwent conventional platinum-based chemotherapy without taxanes. Results: The median age was 54 years (range, 14 to 89 years). Group A had significantly better median OS (45.0 months vs. 30.3 months, p<0.001) and PRS (23.0 months vs. 13.0 months, p<0.001) compared to group B. The OS and PRS were similar between the groups in patients with clear cell or mucinous histology. In contrast, among patients with non-clear cell, non-mucinous histologies, the OS and PRS of group A were significantly better than those of group B (OS, p<0.001; PRS, p<0.001). Multivariable analyses revealed that, among patients with non-clear cell, non-mucinous histologies, chemotherapy including taxane and platinum was an independent predictor of favorable survival outcomes. Conversely, in patients with clear cell or mucinous histology, taxane-including platinum-based combination chemotherapy did not improve the OS and PRS compared to a conventional platinum-based regimen which did not include taxanes. Conclusion: Since the emergence of taxane plus platinum, the prognosis of patients with recurrent ovarian cancer has improved. However, we here demonstrate that this improvement is limited to patients with non-clear cell, non-mucinous histologies.