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Search Results: 1 - 10 of 1325 matches for " Katsumi Shibata "
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Correlation between Mineral Intake and Urinary Excretion in Free-Living Japanese Young Women  [PDF]
Munehiro Yoshida, Tsutomu Fukuwatari, Junya Sakai, Tomiko Tsuji, Katsumi Shibata
Food and Nutrition Sciences (FNS) , 2012, DOI: 10.4236/fns.2012.31018
Abstract: To clarify whether the urinary excretion of calcium, magnesium, phosphorus, iron, zinc, copper, manganese, selenium and molybdenum can be used as an index of their intake, the association between urinary excretion and intake in free-living individuals was examined. A total of 102 healthy free-living female university dietetics students aged 18 - 33 years voluntarily participated in this study, of which 76 students were eligible for this assessment. All food consumed for four consecutive days was recorded accurately by a weighed food record method. A 24-h urine sample was collected on the fourth day, and the urinary levels of sodium, potassium, calcium, magnesium, phosphorus, iron, zinc, copper, manganese, selenium and molybdenum were measured. Significant correlation between urinary excretion and intake was observed in sodium (r = 0.596, p < 0.001), potassium (r = 0.583, p < 0.001), calcium (r = 0.402, p < 0.001), magnesium (r = 0.365, p < 0.01), phosphorus (r = 0.509, p < 0.001), selenium (r = 0.349, p < 0.01) and molybdenum (r = 0.265, p < 0.01). On the other hand, urinary excretion was very low and completely independent of the intake in iron, zinc, copper and manganese. These results indicate that urinary calcium, magnesium, phosphorus, selenium and mo-lybdenum can be used as an index of their intake, similarly to sodium and potassium.
Fate of Dietary Tryptophan in Young Japanese Women
Chiaki Hiratsuka, Tsutomu Fukuwatari and Katsumi Shibata
International Journal of Tryptophan Research , 2012, DOI: 10.4137/IJTR.S10497
Abstract: The purpose of this study was to determine, using the high-performance liquid chromatographic methods recently modified by us, the fate of dietary tryptophan in 17 healthy female Japanese adults who ate self-selected food. The experimental period was 22 days. The habitual intake of tryptophan was 3328.4 μmol/day. 24-hour urine samples were collected at the beginning of the experiment and then once per week. Blood was collected at the beginning and end of the experiment. Levels of tryptophan and its metabolites were measured in blood and urine. Tryptophan, nicotinamide and 2-oxoadipic acid were the major compounds of the blood. The urinary excretion amounts of tryptophan, 5-hydroxyindole-3-acetic acid, kynurenine, anthranilic acid, kynurenic acid, 3-hydroxykynurenine, xanthurenic acid, 3-hydroxyanthranilic acid and quinolinic acid were about 40, 20, 4, 1, 10, 4, 3, 5 and 20 μmol/day, respectively.
Vitamin B1 Deficiency Does not Affect the Liver Concentrations of the Other Seven Kinds of B-Group Vitamins in Rats
Katsumi Shibata,Atsushi Shimizu,Tsutomu Fukuwatari
Nutrition and Metabolic Insights , 2013,
Abstract:
Fate of Dietary Tryptophan in Young Japanese Women
Chiaki Hiratsuka,Tsutomu Fukuwatari,Katsumi Shibata
International Journal of Tryptophan Research , 2012,
Abstract:
Novel IC Thermometer Placed in the Uterotubal Junction to Measure Bovine Uterine Temperature: Technical Note
Roa,Noris; Kamimura,Shunichi; Kurataki,Hideto; Hamana,Katsumi; Morita,Kazuo; Shibata,Ikuo; Linares,Tiburcio;
Revista Científica , 2006,
Abstract: physio-environments in bovine uterus have not been adequately reported due to the limitations in methodology. the objective of the study was to measure bovine uterine temperature (ut) by a novel ic thermometer (ic). data was compared with conventional rectal (rt) and vaginal temperature (vt). ic is a chip housed in a button shaped stainless steel enclosure, 15 mm in length, 5mm in width with a range of +15 to +46°c in 0.125°c increments. it was calibrated with a standard mercury thermometer, and was also correlated with a rectal thermometer installed with a sensor probe (0.1°c precision). ut was measured in 20 min intervals for 4 weeks, while rt and vt were measured every 4 hr. eleven japanese black cows, 8 in the summer and 3 in the winter were subjected to caesarian section (cs). by trans-lumbar laparotomy, ic was installing in the left uterine horn proximate to the uterotubal junction during cs. after recording for 4 weeks, ic was removed by 2nd cs and mounted on the chip reader in the pc. the accumulated data were analyzed by anova for repeated measures. ambient temperature (at) was simultaneously recorded. in 5 cows, blood was daily collected for hormonal (estradiol) assay and underwent ultrasonography to monitor ovarian dynamics. temperature after operation was temporarily elevated for 4 days (0.14°c) and excluded. averages in ut, rt and vt in the summer (at: 28.76°c) were 38.57 ± 0.23°c, 38.67 ± 0.23°c, 38.60 ± 0.35°c, and those in the winter (at: 14.46°c) were 38.63 ± 0.21°c, 38.68 ± 0.21°c, 38.67 ± 0.20°c, respectively. ut was significantly lower than rt or vt, and ut in the summer was lower than in the winter (p < 0.01). diurnal rhythm was observed at all three temperatures, lowest at 08:00 and highest at 20:00 h. upon ovulation, ut in the luteal phase was significantly higher (38.61 ± 0.20°c) than in the follicular phase (38.51 ± 0.22°c, p < 0.01), whereas no difference was observed in rt or vt. in conclusion, ic placed in the uterotubal junction successf
Effects of Pitavastatin on the Intima-Media Thickness of the Carotid Artery in Patients with Ischemic Stroke: The Pitavastatin Efficacy Study on Surrogate Markers and Imaging for Stroke (PESSMIST)  [PDF]
Yasushi Shibata
World Journal of Neuroscience (WJNS) , 2014, DOI: 10.4236/wjns.2014.44034
Abstract:

Pitavastatin is a strong statin that was developed in Japan. The clinical impact of pitavastatin treatment in patients with ischemic stroke has not been reported. We conducted a prospective, open label, clinical case-control study to determine the secondary preventive effects of pitavastatin for patients with cerebral infarction and hyperlipidemia. The pitavastatin group included 20 Japanese patients diagnosed with cerebral infarction and hyperlipidemia without previous statin intake. The control group included 22 patients diagnosed with cerebral infarction without hyperlipidemia. The pitavastatin group of patients received 2 mg of pitavastatin once a day after dinner. The mean age of the patients was 69.3 and 75.5 years for the pitavastatin and control groups, respectively, and the age of the pitavastatin group was significantly younger than that of the control group (P < 0.05). The serum TCho and LDL-C levels significantly decreased two months after the initiation of pitavastatin treatment. The mean and maximum intima-media thickness (IMT) also decreased after the initiation of pitavastatin. The mean and maximum IMT did not show any significant changes in the control group. The change of IMT %/year was less than zero for the pitavastatin group, and was almost zero or higher for the control group. Pitavastatin showed beneficial effects by improving the surrogate makers of stroke. These surrogate makers were effective to evaluate the efficacy of pitavastatin to prevent secondary stroke. Although a prospective randomized study is required to elucidate the long-term effects of pitavastatin, the current study suggests that pitavastatin may be effective to prevent secondary stroke in patients with stroke and hyperlipidemia.

Association between Hardness (Difficulty of Chewing) of the Habitual Diet and Premenstrual Symptoms in Young Japanese Women
Kentaro Murakami, Satoshi Sasaki, Yoshiko Takahashi, Kazuhiro Uenishi, Tomoko Watanabe, Toshiyuki Kohri, Mitsuyo Yamasaki, Reiko Watanabe, Keiko Baba, Katsumi Shibata, Toru Takahashi, Hitomi Hayabuchi, Kazuko Ohki and Junko Suzuki
Environmental Health Insights , 2012,
Abstract: Recent evidence suggests that voluntary rhythmic movements such as chewing may increase blood serotonin and subsequently brain serotonin, which in turn acts to alleviate premenstrual symptoms. In this observational cross-sectional study, we tested the hypothesis that hardness (difficulty of chewing) of the habitual diet (i.e. dietary hardness) is associated with decreased premenstrual symptoms. Subjects were 640 female Japanese dietetic students aged 18–22 years. Dietary hardness was assessed as an estimate of masticatory muscle activity for the habitual diet (i.e. the difficulty of chewing the food). The consumption of a total of 107 foods was estimated by means of a self-administered, comprehensive diet history questionnaire, and masticatory muscle activity during the ingestion of these foods was estimated according to published equations. Menstrual cycle symptoms were assessed using the retrospective version of the Moos Menstrual Distress Questionnaire, from which total score and subscale scores (i.e. pain, concentration, behavioral change, autonomic reactions, water retention, and negative affect) in the premenstrual phase were calculated and expressed as percentages relative to those in the intermenstrual phase. Dietary hardness was not associated with total score in the premenstrual phase (P for trend = 0.48). Further, no association was seen for any subscale score in the premenstrual phase (P for trend = 0.18–0.91). In conclusion, this preliminary study failed to substantiate a hypothesized inverse relationship between hardness of the habitual diet and premenstrual symptoms. Considering the plausibility of the putative mechanism, however, further investigation using more relevant measures of chewing and premenstrual symptoms is warranted.
Effect of Organic Matter Amendment on Hydraulic and Pore Characteristics of a Clay Loam Soil  [PDF]
Moniruzzaman Khan Eusufzai, Katsumi Fujii
Open Journal of Soil Science (OJSS) , 2012, DOI: 10.4236/ojss.2012.24044
Abstract: The objective of this study was to examine the effect of compost, rice straw and sawdust amendment on hydraulic and pore characteristics of a clay loam soil. Amendments were applied at an application rate of0.2 m3/m3 (apparent soil volume) in three rectangular plots each comprising an area of3.0 m2. Water retention characteristics were measured by hanging water column and centrifuge method. Hydraulic conductivity was measured by disc permeameter at -15.0, -6.0, -3.0 and0 cmof water pressure heads. Volumetric water content increased in all amended soils, compared with the control. Unsaturated hydraulic conductivity was almost identical for straw and sawdust at all pressure heads, although that for compost amended soils were much higher. Field saturated hydraulic conductivity (Kfs) was higher in organic matter amended soils as were number of macropores (14.7% - 29.2%). Contribution of each pore class to the total saturated flux was evaluated from the hydraulic conductivity and water retention measurement. A new alternative weighed factor (We) was proposed to estimate the actual contribution of macro- and mesopores to the total saturated water flux. The Wg was found to be more representative for calculating pores contribution to saturated water flux than that of hydraulic conductivity measurement. Although there is only a small fraction of the total porosity, amendment increased effective macro- and meso-porosity (qe). Pores in the amended soils were hydraulically active and water movement was dominated by gravity. Collectively, our results demonstrated that organic matter generated as agricultural by-product could effectively be used to improve soil quality
Pathological Perspective of Drug-Eluting Stent Thrombosis
Katsumi Inoue
Thrombosis , 2012, DOI: 10.1155/2012/219389
Abstract: Although very late stent thrombosis (VLST) after drug-eluting stent (DES) implantation remains a major concern, the precise mechanisms have not been clarified. An association between late acquired incomplete stent apposition (ISA) and VLST of DES has been suggested by several intravascular ultrasound studies demonstrating very high prevalence of ISA in the setting of VLST. To clarify the pathological mechanisms of VLST, we investigated vascular responses of coronary arteries of VLST cases after DES implantation.
Formation of Toxic Amyloid Fibrils by Amyloid β-Protein on Ganglioside Clusters
Katsumi Matsuzaki
International Journal of Alzheimer's Disease , 2011, DOI: 10.4061/2011/956104
Abstract: It is widely accepted that the conversion of the soluble, nontoxic amyloid β-protein (Aβ) monomer to aggregated toxic Aβ rich in β-sheet structures is central to the development of Alzheimer’s disease. However, the mechanism of the abnormal aggregation of Aβ in vivo is not well understood. Accumulating evidence suggests that lipid rafts (microdomains) in membranes mainly composed of sphingolipids (gangliosides and sphingomyelin) and cholesterol play a pivotal role in this process. This paper summarizes the molecular mechanisms by which Aβ aggregates on membranes containing ganglioside clusters, forming amyloid fibrils. Notably, the toxicity and physicochemical properties of the fibrils are different from those of Aβ amyloids formed in solution. Furthermore, differences between Aβ-(1–40) and Aβ-(1–42) in membrane interaction and amyloidogenesis are also emphasized.
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