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Moriwaki M, Wakabayashi H, Sakata K, Domen K. The Effect of Branched Chain Amino Acids-Enriched Nutritional Supplements on Activities of Daily Living and Muscle Mass in Inpatients with Gait Impairments: A Randomized Controlled Trial. J Nutr Health Aging 2019; 23:348-353. [PMID: 30932133 DOI: 10.1007/s12603-019-1172-3] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
OBJECTIVE To investigate the effects of continuous intervention with branched chain amino acids-enriched nutritional supplements from the acute phase to convalescent rehabilitation wards in inpatients with gait impairments. DESIGN Open-label, randomized, parallel-group comparison study (UMIN Clinical Trials Registry ID: UMIN000018640). SETTING Acute care and convalescent rehabilitation wards. PARTICIPANTS We studied 80 patients undergoing stand/gait training. INTERVENTIONS Participants in the intervention group (RJ group) received nutritional supplements (jelly foods comprising 2500 mg BCAA and 20 IU vitamin D) twice a day until hospital discharge. MEASUREMENTS The primary outcome was the motor components of the Functional Independence Measure (FIM-m), and the secondary outcome was skeletal muscle mass index. RESULTS Analyses were conducted on 55 patients who were able to perform stand/gait training continuously from the acute until the recovery phases. FIM-m was significantly elevated in the RJ group and the control group , but no difference was noted between the two groups. Only the RJ group showed a significant increase in skeletal muscle mass index, and the amount of variation was significantly different between the two groups (the control group decreased an average of 2.2% and the RJ group increased an average of 4.3%; P = 0.014). A significant decrease in body weight was found only in the control group (P = 0.084). CONCLUSIONS Nutritional interventions using branched chain amino acids (BCAA)-enriched nutritional supplements demonstrated no significant difference in activities of daily living; however, an increase in skeletal muscle mass was noted. Skeletal muscle mass and body weight differed significantly between the two groups, and BCAA-enriched nutritional supplements intake in acute and convalescent rehabilitation wards may be effective for the prevention of malnutrition and sarcopenia.
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Hayashi T, Shimokawa M, Matsuo K, Miyoshi T, Toriyama Y, Yokota C, Taniguchi J, Hanada K, Tsumagari K, Okubo N, Koutake Y, Sakata K, Kawamata Y, Goto T, Tsurusaki Y, Koyabu M. Risk factors for delayed chemotherapy-induced nausea and vomiting with low-emetic-risk chemotherapy: a prospective, observational, multicenter study. Cancer Manag Res 2018; 10:4249-4255. [PMID: 30323680 PMCID: PMC6177523 DOI: 10.2147/cmar.s176574] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Purpose Improvement in the control of delayed chemotherapy-induced nausea and vomiting (CINV) is needed. There is limited information on antiemetic prophylaxis for patients undergoing low-emetic-risk chemotherapy (LEC), and the optimal antiemetic treatment is not well understood. Therefore, we analyzed the risk factors for delayed CINV to aid in the development of individualized treatments. Patients and methods This prospective multicenter study was conducted in 13 hospitals and included patients with solid cancers undergoing LEC. A total of 222 patients were enrolled between September 2013 and November 2014. The participants completed a daily diary for 5 days after the commencement of the first cycle of LEC to describe the daily incidence of CINV (yes/no). Furthermore, the participants described the severity of nausea and the amount of food intake with the help of VAS. Results Two hundred and ten patients provided their data that were analyzed using multivariate logistic regression to examine the risk factors for delayed CINV. History of CINV, Eastern Cooperative Oncology Group performance status score ≥1, acute CINV, and single-day antiemetic prophylaxis were identified as independent risk factors for delayed CINV. Conclusion The current use of antiemetic prophylaxis according to the recommended guideline appears to effectively control delayed CINV in patients undergoing LEC. Therefore, patients with the abovementioned risk factors should be carefully observed, and their treatment should be adjusted according to their symptoms. The use of multiple-day dexamethasone may be beneficial for those patients who develop acute CINV, especially when it is accompanied by anorexia.
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Nakahashi T, Sakata K, Tada H, Terai H, Horita Y, Ikeda M, Namura M, Takamura M, Hayashi K, Kawashiri M, Yamagishi M. P3672Assessment of ankle-brachial index to predict in-hospital bleeding complication and optimal duration of dual antiplatelet therapy in patients with acute coronary syndrome. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy563.p3672] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Gnatiuc L, Herrington WG, Halsey J, Tuomilehto J, Fang X, Kim HC, De Bacquer D, Dobson AJ, Criqui MH, Jacobs DR, Leon DA, Peters SAE, Ueshima H, Sherliker P, Peto R, Collins R, Huxley RR, Emberson JR, Woodward M, Lewington S, Aoki N, Arima H, Arnesen E, Aromaa A, Assmann G, Bachman DL, Baigent C, Bartholomew H, Benetos A, Bengtsson C, Bennett D, Björkelund C, Blackburn H, Bonaa K, Boyle E, Broadhurst R, Carstensen J, Chambless L, Chen Z, Chew SK, Clarke R, Cox C, Curb JD, D'Agostino R, Date C, Davey Smith G, De Backer G, Dhaliwal SS, Duan XF, Ducimetiere P, Duffy S, Eliassen H, Elwood P, Empana J, Garcia-Palmieri MH, Gazes P, Giles GG, Gillis C, Goldbourt U, Gu DF, Guasch-Ferre M, Guize L, Haheim L, Hart C, Hashimoto S, Hashimoto T, Heng D, Hjermann I, Ho SC, Hobbs M, Hole D, Holme I, Horibe H, Hozawa A, Hu F, Hughes K, Iida M, Imai K, Imai Y, Iso H, Jackson R, Jamrozik K, Jee SH, Jensen G, Jiang CQ, Johansen NB, Jorgensen T, Jousilahti P, Kagaya M, Keil J, Keller J, Kim IS, Kita Y, Kitamura A, Kiyohara Y, Knekt P, Knuiman M, Kornitzer M, Kromhout D, Kronmal R, Lam TH, Law M, Lee J, Leren P, Levy D, Li YH, Lissner L, Luepker R, Luszcz M, MacMahon S, Maegawa H, Marmot M, Matsutani Y, Meade T, Morris J, Morris R, Murayama T, Naito Y, Nakachi K, Nakamura M, Nakayama T, Neaton J, Nietert PJ, Nishimoto Y, Norton R, Nozaki A, Ohkubo T, Okayama A, Pan WH, Puska P, Qizilbash N, Reunanen A, Rimm E, Rodgers A, Saitoh S, Sakata K, Sato S, Schnohr P, Schulte H, Selmer R, Sharp D, Shifu X, Shimamoto K, Shipley M, Silbershatz H, Sorlie P, Sritara P, Suh I, Sutherland SE, Sweetnam P, Tamakoshi A, Tanaka H, Thomsen T, Tominaga S, Tomita M, Törnberg S, Tunstall-Pedoe H, Tverdal A, Ueshima H, Vartiainen E, Wald N, Wannamethee SG, Welborn TA, Whincup P, Whitlock G, Willett W, Woo J, Wu ZL, Yao SX, Yarnell J, Yokoyama T, Yoshiike N, Zhang XH. Sex-specific relevance of diabetes to occlusive vascular and other mortality: a collaborative meta-analysis of individual data from 980 793 adults from 68 prospective studies. Lancet Diabetes Endocrinol 2018; 6:538-546. [PMID: 29752194 PMCID: PMC6008496 DOI: 10.1016/s2213-8587(18)30079-2] [Citation(s) in RCA: 134] [Impact Index Per Article: 22.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/15/2017] [Revised: 02/20/2018] [Accepted: 02/26/2018] [Indexed: 01/06/2023]
Abstract
BACKGROUND Several studies have shown that diabetes confers a higher relative risk of vascular mortality among women than among men, but whether this increased relative risk in women exists across age groups and within defined levels of other risk factors is uncertain. We aimed to determine whether differences in established risk factors, such as blood pressure, BMI, smoking, and cholesterol, explain the higher relative risks of vascular mortality among women than among men. METHODS In our meta-analysis, we obtained individual participant-level data from studies included in the Prospective Studies Collaboration and the Asia Pacific Cohort Studies Collaboration that had obtained baseline information on age, sex, diabetes, total cholesterol, blood pressure, tobacco use, height, and weight. Data on causes of death were obtained from medical death certificates. We used Cox regression models to assess the relevance of diabetes (any type) to occlusive vascular mortality (ischaemic heart disease, ischaemic stroke, or other atherosclerotic deaths) by age, sex, and other major vascular risk factors, and to assess whether the associations of blood pressure, total cholesterol, and body-mass index (BMI) to occlusive vascular mortality are modified by diabetes. RESULTS Individual participant-level data were analysed from 980 793 adults. During 9·8 million person-years of follow-up, among participants aged between 35 and 89 years, 19 686 (25·6%) of 76 965 deaths were attributed to occlusive vascular disease. After controlling for major vascular risk factors, diabetes roughly doubled occlusive vascular mortality risk among men (death rate ratio [RR] 2·10, 95% CI 1·97-2·24) and tripled risk among women (3·00, 2·71-3·33; χ2 test for heterogeneity p<0·0001). For both sexes combined, the occlusive vascular death RRs were higher in younger individuals (aged 35-59 years: 2·60, 2·30-2·94) than in older individuals (aged 70-89 years: 2·01, 1·85-2·19; p=0·0001 for trend across age groups), and, across age groups, the death RRs were higher among women than among men. Therefore, women aged 35-59 years had the highest death RR across all age and sex groups (5·55, 4·15-7·44). However, since underlying confounder-adjusted occlusive vascular mortality rates at any age were higher in men than in women, the adjusted absolute excess occlusive vascular mortality associated with diabetes was similar for men and women. At ages 35-59 years, the excess absolute risk was 0·05% (95% CI 0·03-0·07) per year in women compared with 0·08% (0·05-0·10) per year in men; the corresponding excess at ages 70-89 years was 1·08% (0·84-1·32) per year in women and 0·91% (0·77-1·05) per year in men. Total cholesterol, blood pressure, and BMI each showed continuous log-linear associations with occlusive vascular mortality that were similar among individuals with and without diabetes across both sexes. INTERPRETATION Independent of other major vascular risk factors, diabetes substantially increased vascular risk in both men and women. Lifestyle changes to reduce smoking and obesity and use of cost-effective drugs that target major vascular risks (eg, statins and antihypertensive drugs) are important in both men and women with diabetes, but might not reduce the relative excess risk of occlusive vascular disease in women with diabetes, which remains unexplained. FUNDING UK Medical Research Council, British Heart Foundation, Cancer Research UK, European Union BIOMED programme, and National Institute on Aging (US National Institutes of Health).
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Tsubota-Utsugi M, Yonekura Y, Tanno K, Nozue M, Shimoda H, Nishi N, Sakata K, Kobayashi S. Association between health risks and frailty in relation to the degree of housing damage among elderly survivors of the great East Japan earthquake. BMC Geriatr 2018; 18:133. [PMID: 29898680 PMCID: PMC6001143 DOI: 10.1186/s12877-018-0828-x] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2017] [Accepted: 05/28/2018] [Indexed: 11/15/2022] Open
Abstract
Background Many survivors of the Great East Japan Earthquake that occurred in 2011 were at risk of deteriorating health, especially elderly people living in disaster-stricken areas. The objectives of this prospective study were: a) to clarify the different lifestyle and psychosocial factors associated with frailty by sex among the non-disabled elderly survivors, and b) to describe the differences in characteristics stratified by the degree of disaster-related housing damage. Methods We followed 2261 Japanese survivors aged ≥65 years (45.3% male; mean age, 71.7 years) without disability or frailty who completed a self-administered questionnaire at baseline. All participants completed a baseline questionnaire in 2011 and at least one identical follow-up questionnaire between 2012 and 2015 regarding lifestyle (smoking status, alcohol intake, physical activity, sedentary lifestyle, and dietary intake) and psychosocial factors (self-rated health, standard of living, psychological distress, and social networks). Frailty was defined as a score of ≥5 on the Kihon Checklist, which is used by the Japanese government to certify the need for long-term care insurance. Adjusted odds ratios and 95% confidence intervals with frailty as the dichotomous dependent variable and health factors as the independent variables were calculated using a multilevel model for repeated measures by sex, followed by stratification analyses by the degree of housing damage. Results Over the 4-year study period, 510 participants (22.6%) developed frailty. In the post-disaster setting, many of the psychosocial factors remained more prevalent 4 years later among survivors with extensive housing damage. The presence of risk factors regarding the development of frailty differed by the degree of housing damage. Among men, psychological distress, in parallel with a poor social network, was related to frailty among only the participants with extensive housing damage and those living in temporary housing, whereas among women, worsening psychological distress was associated only with no damage and no displaced survivors. Among women with extensive damage and displacement, health outcomes such as overweight and diabetes and poor social networks were strongly related to frailty. Conclusions Lifestyle and psychosocial factors associated with the risk of frailty differ by sex and the degree of housing damage. Electronic supplementary material The online version of this article (10.1186/s12877-018-0828-x) contains supplementary material, which is available to authorized users.
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Dong BE, Xue Y, Sakata K. The effect of enriched environment across ages: A study of anhedonia and BDNF gene induction. GENES BRAIN AND BEHAVIOR 2018; 17:e12485. [PMID: 29717802 DOI: 10.1111/gbb.12485] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/06/2018] [Revised: 04/26/2018] [Accepted: 04/26/2018] [Indexed: 12/19/2022]
Abstract
Enriched environment treatment (EET) is a potential intervention for depression by inducing brain-derived neurotrophic factor (BDNF). However, its age dependency remains unclear. We recently found that EET during early-life development (ED) was effective in increasing exploratory activity and anti-despair behavior, particularly in promoter IV-driven BDNF deficient mice (KIV), with the largest BDNF protein induction in the hippocampus and frontal cortex. Here, we further determined age dependency of EET effects on anhedonia and promoter-specific BDNF transcription, by using the sucrose preference test and qRT-PCR. Wild-type (WT) and KIV mice received 2 months of EET during ED, young-adulthood and old-adulthood (0-2, 2-4 and 12-14 months, respectively). All KIV groups showed reduced sucrose preference, which EET equally reversed regardless of age. EET increased hippocampal BDNF mRNA levels for all ages and genotypes, but increased frontal cortex BDNF mRNA levels only in ED KIV and old WT mice. Transcription by promoters I and IV was age-dependent in the hippocampus of WT mice: more effective induction of exon IV or I during ED or old-adulthood, respectively. Transcription by almost all 9 promoters was age-specific in the frontal cortex, mostly observed in ED KIV mice. After discontinuance of EET, the EET effects on anti-anhedonia and BDNF transcription in both regions persisted only in ED KIV mice. These results suggested that EET was equally effective in reversing anhedonia and inducing hippocampal BDNF transcription, but was more effective during ED in inducing frontal cortex BDNF transcription and for lasting anti-anhedonic and BDNF effects particularly in promoter IV-BDNF deficiency.
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Ishibashi Y, Kudo M, Yonezawa H, Shimoda H, Sakata K, Kobayashi S, Ogawa A, Terayama Y. Study of headache after the Great East Japan earthquake in Iwate coast area –comparison with migraineurs and non-migraineurs- part1. J Neurol Sci 2017. [DOI: 10.1016/j.jns.2017.08.3427] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Kudo M, Ishibashi Y, Yonezawa H, Shimoda H, Sakata K, Kobayashi S, Ogawa A, Terayama Y. Study of headache after the Great East Japan earthquake in Iwate coast area. –Comparison with migraineurs and non-migraineurs - part 2. J Neurol Sci 2017. [DOI: 10.1016/j.jns.2017.08.3435] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Nishikawa K, Yoshino S, Morita S, Takahashi T, Sakata K, Nagao J, Nemoto H, Murakami N, Hasegawa H, Shimizu R, Yoshikawa T, Osanai H, Imano M, Naitoh H, Tanaka A, Sakamoto J, Saji S, Oka M. Safety and efficacy of S-1 treatment in elderly patients with advanced or recurrent gastric cancer: A subgroup analysis from the phase III JFMC36-0701 trial. Ann Oncol 2017. [DOI: 10.1093/annonc/mdx369.063] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Sakata K, Ozawa T, Okuyama Y, Haraguchi R, Tsuchiya T, Horie M, Ashihara T. P2649Not all non-paroxysmal atrial fibrillation drivers are included in complex fractionated electrogram area or low-voltage area: ExTRa Mapping project. Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx502.p2649] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Tada H, Okada H, Nakahashi T, Sakata K, Kawashiri M, Nohara A, Mabuchi H, Yamagishi M. P6240Assessments of carotid plaque burden in patients with familial hypercholesterolemia. Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx493.p6240] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Sakata K, Gamou T, Kawashiri M, Matsubara T, Ino H, Okeie K, Namura M, Yamagishi M. P1792Impact of baseline high-sensitive C-reactive protein on the regression of coronary atherosclerosis in patients treated with combined lipid and blood pressure-lowering therapy: Insight from MILLION stu. Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx502.p1792] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Takahashi S, Nakamura M, Yonekura Y, Tanaka F, Tanno K, Ohsawa M, Itai K, Omama S, Ishibashi Y, Ogasawara K, Sakata K, Ohta M, Okayama A. P3454A comparison of the predictive ability of cardiovascular biomarkers for requiring long-term care service due to physical and cognitive impairments in an elderly general population. Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx504.p3454] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Sakata K, Okuyama Y, Ozawa T, Haraguchi R, Horie M, Ashihara T. P3979Using large-tip ablation catheter markedly decreases bipolar signal amplitude near spiral wave center but this is not the case with using multi-electrode mapping catheter: A simulation study. Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx504.p3979] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Tanaka Y, Yoshimuta T, Sakata K, Kawashiri M, Yamagishi M. P5171Sex-related differences in patients with type A acute aortic dissection. Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx493.p5171] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Yokawa J, Mori M, Nakanishi C, Sakata K, Okada H, Shimojima M, Yoshida S, Yoshimuta T, Yamagishi M. P3320The hyperacute vessel response after biodegradable-polymer sirolimus-eluting stent implantation in swine model. Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx504.p3320] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Sakata K, Ozawa T, Okuyama Y, Haraguchi R, Tsuchiya T, Horie M, Ashihara T. P1718Non-paroxysmal atrial fibrillation wave dynamics were determined by age rather than echocardiographic measurements and BNP: A clinical study using the ExTRa Mapping system. Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx502.p1718] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Nakahashi T, Tada H, Sakata K, Tanaka Y, Nomura A, Yakuta Y, Gamou T, Terai H, Horita Y, Ikeda M, Namura M, Takamura M, Kawashiri M, Yamagishi M. P3649Impact of extra-cardiac diseased location on long-term prognosis in patients with acute coronary syndrome who underwent percutaneous coronary intervention. Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx504.p3649] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Hayashi T, Shimokawa M, Hiraike M, Toriyama Y, Yokota C, Taniguchi J, Hanada K, Tsumagari K, Okubo N, Koutake Y, Sakata K, Kawamata Y, Goto T, Tsurusaki Y, Koyabu M. Evaluation of risk factors predicting delayed chemotherapy-induced nausea and vomiting in patients receiving low emetic risk chemotherapy (LEC): A prospective, observational, multicenter study. Ann Oncol 2017. [DOI: 10.1093/annonc/mdx261.153] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Eigl R, Steier P, Sakata K, Sakaguchi A. Vertical distribution of 236U in the North Pacific Ocean. JOURNAL OF ENVIRONMENTAL RADIOACTIVITY 2017; 169-170:70-78. [PMID: 28088697 DOI: 10.1016/j.jenvrad.2016.12.010] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/28/2016] [Accepted: 12/19/2016] [Indexed: 06/06/2023]
Abstract
The first extensive study on 236U in the North Pacific Ocean has been conducted. The vertical distribution of 236U/238U isotopic ratios and the 236U concentrations were analysed on seven depth profiles, and large variations with depth were found. The range of 236U/238U isotopic ratios was from (0.09 ± 0.03) × 10-10 to (14.1 ± 2.2) × 10-10, which corresponds to 236U concentrations of (0.69 ± 0.24) × 105 atoms/kg and (119 ± 21) × 105 atoms/kg, respectively. The variations in 236U concentrations could mainly be attributed to the different water masses in the North Pacific Ocean and their formation processes. Uranium-236 inventories on the water column of each sampling station were calculated and varied between (3.89 ± 0.08) × 1012 atoms/m2 and (7.03 ± 0.50) × 1012 atoms/m2, which is lower than in former studies on comparable latitudes in the North Atlantic Ocean and the Sea of Japan. The low inventories of 236U found for the North Pacific Ocean in this study can be explained by the lack of additional input sources of artificial radionuclides, apart from global and regional/local fallout. This study expands the use of 236U as oceanographic circulation tracer to yet another ocean basin and shows that this isotope can be used for tracing circulation patterns of water masses in the Pacific Ocean.
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Sakata K, Yoshimura N, Tanabe K, Kito K, Nagase K, Iida H. Prediction of hypotension during spinal anesthesia for elective cesarean section by altered heart rate variability induced by postural change. Int J Obstet Anesth 2017; 29:34-38. [DOI: 10.1016/j.ijoa.2016.09.004] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/18/2016] [Revised: 09/12/2016] [Accepted: 09/17/2016] [Indexed: 10/21/2022]
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Eigl R, Steier P, Winkler SR, Sakata K, Sakaguchi A. First study on 236U in the Northeast Pacific Ocean using a new target preparation procedure for AMS measurements. JOURNAL OF ENVIRONMENTAL RADIOACTIVITY 2016; 162-163:244-250. [PMID: 27289064 DOI: 10.1016/j.jenvrad.2016.05.025] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/2016] [Revised: 05/19/2016] [Accepted: 05/23/2016] [Indexed: 06/06/2023]
Abstract
We succeeded in obtaining the depth profile of 236U for a sampling station in the Northeast Pacific Ocean using only one litre of seawater sample from each depth. For this purpose, a new procedure was developed that allowed for the preparation of accelerator mass spectrometry targets for trace uranium using only 100 μg of iron carrier material. The 236U concentrations in water samples from the Northeast Pacific Ocean showed large variations from (9.26 ± 0.42) × 106 atoms/kg at 60 m depth to (0.08 ± 0.02) × 106 atoms/kg at a depth of 3000 m. The high 236U concentrations in surface water reflect the input of 236U by global and local fallout from nuclear weapons tests. The low 236U concentrations in seawater from 1500 m and below are an indicator for the low vertical diffusion of surface water to deeper layers in the North Pacific Ocean. The total inventory of 236U on the water column was (8.35 ± 0.23) × 1012 atoms/m2, which is lower compared to those of other ocean regions solely affected by global fallout on comparable latitudes. This study represents the first dataset for 236U in the Pacific Ocean and shows the possibility of downsizing sample volumes which may help in future applications of 236U as tracer for large ocean areas.
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Kurisu M, Sakata K, Miyamoto C, Takaku Y, Iizuka T, Takahashi Y. Variation of Iron Isotope Ratios in Anthropogenic Materials Emitted through Combustion Processes. CHEM LETT 2016. [DOI: 10.1246/cl.160451] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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Miyamoto C, Marcus MA, Sakata K, Kurisu M, Takahashi Y. Depth-dependent Calcium Speciation in Individual Aerosol Particles by Combination of Fluorescence Yield and Conversion Electron Yield XAFS Using X-ray Microbeam. CHEM LETT 2016. [DOI: 10.1246/cl.160392] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Sakata K, Nakayamada S, Miyazaki Y, Kubo S, Nakano K, Tanaka Y. OP0162 Toll-like Receptor 7-, but Not Toll-like Receptor 9-, Mediated Interferon-α Production from Plasmacytoid Dendritic Cells in Systemic Lupus Erythematosus. Ann Rheum Dis 2016. [DOI: 10.1136/annrheumdis-2016-eular.2231] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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