85 results on '"K. Futagami"'
Search Results
2. Analysis of the feeding ecology of earthworms (Megascolecidae) in Japanese forests using gut content fractionation and and stable isotope natural abundances
- Author
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Masamichi T. Ito, T. Uchida, K. Futagami, T. Sasaki, A. Sugimoto, and Nobuhiro Kaneko
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Forest floor ,Ecology ,biology ,Soil organic matter ,Earthworm ,Amynthas ,Soil Science ,biology.organism_classification ,Agricultural and Biological Sciences (miscellaneous) ,Humus ,Megascolecidae ,biology.animal ,Botany ,Soil horizon ,Lumbricidae - Abstract
Differences in food resource use by earthworms (Megascolecidae) were studied at three Japanese forest sites with different latitude in cool-temperate (TOEF), temperate (MFF) and subtropical (Yona) zones. The vertical distribution and the fractionation of gut contents of earthworms were analysed to determine ecological categories. At TOEF and MFF, earthworm communities were composed of species living mainly in litter and topsoil layers. At TOEF, Amynthas vittatus (Goto and Hatai, 1898), Metaphire hilgendorfi (Michaelsen, 1892) and Eisenia japonica (Michaelsen, 1891) (Lumbricidae) were dominant, the former two species being mainly observed in the litter layer whereas the latter was in soil layers. At MFF, ‘Metaphire’ soulensis (Kobayashi, 1938), Amynthas purpuratus (Ishizuka, 1999), A. vittatus and Amynthas distichus (Ishizuka, 2000) were dominant and the former three species were observed in the litter layer whereas the latter one occurred in soil. The gut contents of those living in the litter layer had more organic fractions, whereas the latter had more inorganic fractions. Therefore these species were regarded as epigeic species and polyhumic-endogeic species, respectively. At Yona, Amynthas yambaruensis (Ishizuka and Azama, 2000) had burrows through 20 cm depth with casts and middens on the forest floor, and their fraction ratio of gut content was intermediate between the epigeic and endogeic earthworms at TOEF and MFF. Therefore A. yambaruensis was classified as anecic. In addition, at Yona, there were two unidentified Amynthas spp.; one epigeic species in the midden of A. yambaruenesis, and one endogeic species found in B-layer soil. Natural abundances of the stable isotope pairs 13 C / 12 C and 15 N / 14 N ( δ 13 C and δ 15 N ) were measured in soil organic matter and earthworm tissue. δ 15 N values showed epigeic δ 15 N values were in the order anecic 15 N enrichments thus appear to indicate that the functional niches of earthworm species are due to resources available to them in the decomposition process from fresh litter to humus. δ 13 C values showed similar trends, but the differences between ecological group was smaller compared to δ 15 N .
- Published
- 2004
3. Evaluation of Esophageal Motility by Endosonography Using a Miniature Ultrasonographic Probe in Patients with Reflux Esophagitis
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Kazuaki Chayama, Hiroaki Kusunoki, Shinji Tanaka, Jiro Hata, S. Yoshida, K. Futagami, Ken Haruma, and Noriaki Manabe
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Adult ,Male ,medicine.medical_specialty ,Sensitivity and Specificity ,Severity of Illness Index ,Gastroenterology ,Endosonography ,Reference Values ,Internal medicine ,medicine ,Humans ,Esophageal Motility Disorders ,Reflux esophagitis ,Esophagus ,Esophagitis, Peptic ,Peristalsis ,medicine.diagnostic_test ,Esophageal disease ,business.industry ,medicine.disease ,Endoscopy ,medicine.anatomical_structure ,Case-Control Studies ,Gastroesophageal Reflux ,Female ,Radiology ,CTD ,business ,Esophagitis ,Esophageal motility - Abstract
Although there are several established methods used to evaluate esophageal motility, none allows for direct observation of esophageal wall motion. Esophageal dysmotility is thought to contribute to reflux esophagitis (RE). The aim of this study was to evaluate esophageal wall motility by endosonography using a miniature ultrasonographic probe (MUP) in patients with RE.The subjects consisted of 10 healthy controls (10 men with a mean age of 31.5 years) and 9 patients with RE (4 men and 5 women with a mean age of 51.5 years). High-frequency endoluminal sonography was performed using a 20-MHz transducer through a 16F gastric tube to evaluate esophageal wall motion. Four sonographic phases of an esophageal peristaltic sequence were identified. In the resting phase, the esophageal wall was in direct contact with the transducer. In the passive distention phase, the esophageal lumen was stretched maximally; in the contraction phase, it contracted; and in the relaxation phase, it returned to baseline. The baseline thickness of the muscle layers of the esophageal wall was measured at rest. The width decreased during the passive distention phase, increased and reached a maximum during the contraction phase, and returned to baseline during the relaxation phase.The contractility index of the circular smooth muscle (CSM) in the distal esophagus and of the longitudinal smooth muscle (LSM) in the proximal esophagus were significantly lower in patients with RE. The duration of contraction in the distal esophagus was significantly longer in RE.We used a MUP to demonstrate abnormalities in esophageal wall motility in patients with RE. We conclude that the MUP is a potentially useful technique for evaluating esophageal dysmotility.
- Published
- 2002
4. Dopaminergic neurotransmission triggers ischemia-induced hyperactivity in Mongolian gerbils
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T, Yamamoto, H, Araki, K, Futagami, H, Kawasaki, and Y, Gomita
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Male ,Restraint, Physical ,hyperativity ,Time Factors ,ischemia ,Hyperkinesis ,Motor Activity ,Synaptic Transmission ,Brain Ischemia ,haloperidol ,Animals ,Dopamine Antagonists ,cardiovascular diseases ,dopamine ,Gerbillinae ,Mongolian gerbils ,Injections, Intraperitoneal - Abstract
It is recognized that sustained ischemia-induced hyperactivity is related to abnormalities in dopamine function. However, it is unclear that dopaminergic neurotransmission triggers such ischemia-induced hyperactivity. Therefore, the relationship between dopaminergic neurotransmission and ischemia-induced hyperactivity was investigated in an animal model using Mongolian gerbils. When haloperidol 2 mg/kg was administered i.p. 30 min after ischemia, the ischemia-induced hyperactivity at 24 h after ischemia was blocked. General behavior was similar to that of sham-operated animals. Haloperidol at doses of 0.1 and 0.2 mg/kg had no effect on locomotor activity in sham-operated animals and decreased ischemia-induced hyperactivity when the drug was administered 24 h after ischemia; these doses did not have any effect on ischemia-induced hyperactivity when the drug was administered 30 min after ischemia. On the other hand, when the animal was confined to a small, restrictive cage for the 24 h period immediately following ischemic injury, locomotor activity at 24 h after ischemia increased. Such behavior also increased in animals when they were returned to their original more permissive cages immediately after ischemia. It is conceivable that the decrease in the level of activity was not related to ischemia-induced hyperactivity. These data suggested that the inhibition of ischemia-induced hyperactivity can be induced by complete blockage of dopaminergic receptors immediately after ischemia.
- Published
- 2001
5. The role of ZnO in Cu/ZnO methanol synthesis catalysts — morphology effect or active site model?
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Y. Choi, Junji Nakamura, K Futagami, and Tadahiro Fujitani
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biology ,Process Chemistry and Technology ,Inorganic chemistry ,Active site ,chemistry.chemical_element ,Activation energy ,Zinc ,Copper ,Catalysis ,Water-gas shift reaction ,chemistry.chemical_compound ,chemistry ,Transition metal ,biology.protein ,Methanol - Abstract
We examined whether or not the presence of ZnO changed the morphology of Cu particles in Cu/ZnO methanol synthesis catalysts using physical mixtures of Cu/SiO2+ZnO/SiO2. The yield of methanol produced by the CO2 hydrogenation over the physical mixture increased by the reduction with H2 at 573–723 K. The promotion of the methanol synthesis activity was due to migration of Zn from ZnO onto Cu/SiO2, leading to the Cu–Zn active sites, as previously reported. On the other hand, no activity change was observed upon the reduction treatment for the reverse water gas shift (RWGS) reaction over the physical mixture; this result cannot be explained by the morphology change. The activation energy of the methanol synthesis and the RWGS reaction over the physical mixture did not vary upon reduction, further supporting the absence of any morphology change. It was thus clearly proved that the role of ZnO was not to change the morphology of Cu, but to create the Cu–Zn active sites for methanol synthesis only.
- Published
- 2001
6. [Untitled]
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T. Fujitani, K. Futagami, Junji Nakamura, and Y. Choi
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biology ,Chemistry ,Inorganic chemistry ,Active site ,chemistry.chemical_element ,General Chemistry ,Heterogeneous catalysis ,Copper ,Catalysis ,chemistry.chemical_compound ,Transition metal ,biology.protein ,Methanol ,Organometallic chemistry ,Carbon monoxide - Abstract
The effect of Zn in copper catalysts on the activities for both CO2 and CO hydrogenations has been examined using a physical mixture of Cu/SiO2+ZnO/SiO2 and a Zn-containing Cu/SiO2 catalyst or (Zn)Cu/SiO2. Reduction of the physical mixture with H2 at 573–723 K results in an increase in the yield of methanol produced by the CO2 hydrogenation, while no such a promotion was observed for the CO hydrogenation, indicating that the active site is different for the CO2 and CO hydrogenations. However, the methanol yield by CO hydrogenation is significantly increased by the oxidation treatment of the (Zn)Cu/SiO2 catalyst. Thus it is concluded that the Cu–Zn site is active for the CO2 hydrogenation as previously reported, while the Cu–O–Zn site is active for the CO hydrogenation.
- Published
- 2001
7. Book reviews
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S. C. Littlechild, S. Klasen, J. Oechssler, K. Futagami, B. Hayo, and K. Hamada
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Economics and Econometrics ,General Business, Management and Accounting - Published
- 1999
8. [Untitled]
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S. Nagai, K. Futagami, Yutaka Nakashimada, Y.-J. Chang, Alberto Emilio Bainotti, and Naomichi Nishio
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Vitamin b ,biology ,High density ,Bioengineering ,Methanobacteriales ,General Medicine ,Methanosaeta concilii ,biology.organism_classification ,Applied Microbiology and Biotechnology ,Methanosaeta ,chemistry.chemical_compound ,chemistry ,Acetobacterium ,Biochemistry ,Bioreactor ,Methanol ,Biotechnology ,Nuclear chemistry - Abstract
A novel continuous culture system of Acetobacterium sp. coupled with a fixed-bed reactor of Methanosaeta conciliiis described. With methanol (250 mmol l ) plus CO at D= 0.02 h , the productivities of vitamin B 12 and cells were 1.2 mg l .d and 0.31 g l d , respectively, with 83% methanol consumption. With methanol (250 mmol l )-formate (150 mmol l ), however, these productivities increased ca. 2.7-fold, respectively at the same D, with complete consumption of methanol. At D= 0.15 h -1 with these latter substrates, these productivities enhanced ca. 14-fold, that is, 17 mg l .d and 4.3 g l .d, respectively, with 51% methanol consumption.
- Published
- 1997
9. Fractographic Studies on the Cleavage Fracture of Single Crystals of Iron
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K. Kitajima and K. Futagami
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Crystallography ,Materials science ,Fractography ,Cleavage (crystal) ,Crystal twinning - Published
- 2009
10. Low- level radiation measuring system using magnetically levitated electrode ionization chamber
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Yusuke Uozumi, N. Yamanaka, Toshirou Kawaguchi, G. Wakabayasi, M. Matoba, Nobuo Ikeda, K. Futagami, and M. Kaneko
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Physics ,Equivalent dose ,Absorbed dose ,Electrode ,Ionization chamber ,Analytical chemistry ,Low-Level Radiation ,Radiation ,Sensitivity (electronics) ,Magnetic levitation - Abstract
An automatic measuring system using an ionization chamber having a magnetic levitation electrode has been developed. To check the system performance, environmental radiations and natural /sup 40/K /spl gamma/-rays have been measured. Results of measurements of environmental radiations confirm the system sensitivity to be high and stable, and those of /sup 40/K /spl gamma/-rays show possibility of measurement of ultra-low level radiation even with an ionization chamber. Minimum detectable ionization current is 2.3 /spl times/ 10/sup -17/ A. It corresponds to 2.4n Gy/h and 0.0024 /spl mu/ Sv/h, respectively in the absorbed dose and the dose equivalent rates. The developed system is useful for the monitor to measure the environmental dose rate.
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- 2005
11. Photoacoustic investigations of the impurity states in silicon by using a piezoelectric transducer
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K. Miyazaki, T. Ikari, and K. Futagami
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Materials science ,Absorption edge ,Silicon ,chemistry ,Impurity ,Analytical chemistry ,chemistry.chemical_element ,Plateau (mathematics) ,Boron ,Acceptor ,Piezoelectricity ,Spectral line - Abstract
Photoacoustic (PA) measurements of p-Si single crystals near the optical absorption edge were carried out by using a PZT as a detector. A pronounced peak at 1.07 eV appears in addition to the plateau. By considering a hole carrier concentration dependence and a compensation effect by thermally generated donors on the PA spectra, it is concluded that the observed peak is due to the transitions involving boron acceptor impurities. Low temperature spectra down to 90 K also support this conclusion. >
- Published
- 2002
12. Extracorporeal ultrasound is an effective diagnostic alternative to endoscopic ultrasound for gastric submucosal tumours
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Ken Haruma, Kazuaki Chayama, Jiro Hata, Shinji Tanaka, S. Yoshida, N Yamashita, and K. Futagami
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Endoscopic ultrasound ,Adult ,Male ,medicine.medical_specialty ,Adolescent ,Endoscopic ultrasonography ,Sensitivity and Specificity ,Extracorporeal ,Endosonography ,Stomach Neoplasms ,Submucosa ,Medicine ,Humans ,Prospective Studies ,Medical diagnosis ,Prospective cohort study ,Aged ,Aged, 80 and over ,medicine.diagnostic_test ,business.industry ,Stomach ,Ultrasound ,Gastroenterology ,Middle Aged ,digestive system diseases ,medicine.anatomical_structure ,Female ,Radiology ,business - Abstract
Although endoscopic ultrasonography (EUS) is the best modality in the diagnosis of gastric submucosal tumours (G-SMT), it is still invasive and expensive. We evaluated the usefulness of transabdominal ultrasonography (US) as an alternative to EUS in the assessment and clinical management of G-SMT.This is a prospective study of 156 successive patients who had been diagnosed with G-SMT by direct endoscopic visualization. For each patient, US was performed prior to EUS by an examiner who had not been informed about the site or the size of the patient's G-SMT beforehand. US diagnoses were compared with those ascertained by EUS. Diagnostic grade by US was divided into three groups: diagnosed (G-SMT was clearly demonstrated including location, site and type), detected (G-SMT was demonstrable but the type was not clear) and undetected (G-SMT was not demonstrated by US).We found that US can be an alternative to EUS for: 1) diagnosis of extramural compression, 2) diagnosis of G-SMT with size30 mm in diameter, 3) detection and measurement of the size of a G-SMT from 21 to 30 mm in diameter, and 4) detection and measurement of the size of a G-SMT at both the gastric angle and cardia, regardless of the size of the tumour. Overall sensitivity and specificity for the detection of G-SMT were 82.5% and 100%, respectively. The diagnostic rates of G-SMT in each group were 60.1% (86/143) for diagnosed, 22.4% (32/143) for detected and 17.5% (25/143) for undetected. Approximate 95% (21/22) of G-SMT over 20 mm in diameter were at least detected, and 97% (30/31) of G-SMT over 30 mm in diameter were diagnosed by US.US can be an alternative method in the assessment of G-SMT, especially in the follow-up of patients already diagnosed.
- Published
- 2001
13. Near band edge photoacoustic spectra od GaAs below room temperature
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K. Maeda, K. Futagami, T. Ikari, and H. Yokoyama
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chemistry.chemical_classification ,Photoacoustic effect ,Chemistry ,Band gap ,Optical transition ,Analytical chemistry ,Photoacoustic imaging in biomedicine ,Mineralogy ,Edge (geometry) ,Condensed Matter Physics ,Spectral line ,Electronic, Optical and Magnetic Materials ,Dislocation ,Inorganic compound - Abstract
Etude des variations des spectres photoacoustiques PA des monocristaux de GaAs avec la temperature. La spectroscopie PA est un outil utile pour l'etude des etats localises dans la bande interdite. On parvient en particulier a resoudre les signaux relatifs au bord de bande et aux dislocations dans les spectres PA
- Published
- 1990
14. Angiotensin inhibits neurotransmission of calcitonin gene-related peptide-containing vasodilator nerves in mesenteric artery of spontaneously hypertensive rats
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H, Kawasaki, M, Takenaga, H, Araki, K, Futagami, and Y, Gomita
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Captopril ,Thiazepines ,Angiotensin II ,Calcitonin Gene-Related Peptide ,Angiotensin-Converting Enzyme Inhibitors ,Rats, Inbred WKY ,Synaptic Transmission ,Mesenteric Arteries ,Methoxamine ,Rats ,Vasodilation ,Vasomotor System ,Angiotensin Receptor Antagonists ,Rats, Inbred SHR ,Animals ,Angiotensin I ,Saralasin - Abstract
The role of angiotensin (Ang) in neurotransmission of calcitonin gene-related peptide (CGRP)-containing vasodilator nerves in perfused mesenteric vascular beds isolated from spontaneously hypertensive rats (SHR) (8- and 15-week-old) and age-matched Wistar Kyoto rats (WKY) was investigated. In both SHR and WKY preparations precontracted by continuous perfusion of Krebs' solution containing 7 microM methoxamine plus 5 microM guanethidine, periarterial nerve stimulation (PNS; 1 and 2 Hz) produced a frequency-dependent vasodilation, which was abolished by 100 nM tetrodotoxin and 500 nM CGRP(8-37) (CGRP receptor antagonist). The PNS-induced vasodilation in the SHR decreased with age and was smaller than that in the WKY. The neurogenic vasodilation in the SHR but not WKY was significantly inhibited by N-acetyltetradecapeptide renin substrate (RS, 100 and 500 nM), AngI (50 and 100 nM) and AngII (50 and 100 nM). The inhibitory effects of RS, AngI and AngII were abolished by the AngII receptor antagonist, [Sar1,Ile8]AngII (500 nM). The effect of RS and AngI was inhibited by captopril (5 microM) and temocapril (500 nM). AngII (100 nM) had no effect on vasodilator response to exogenously infused CGRP (100 pmol). PNS (2 Hz) of perfused mesenteric vascular beds increased the release of CGRP-like immunoreactivities (CGRP-LI) in the perfusate, which was less in 15-week-old SHR than in age-matched WKY. AngII (100 nM) significantly inhibited the neurogenic release of CGRP-LI in the SHR but not in the WKY. These results suggest that exogenous and locally converted AngII, via AngII receptors, modulates the neurotransmission of CGRP-containing vasodilator nerves by inhibiting CGRP release from the nerve.
- Published
- 1998
15. Relapse and elevation of blood urea nitrogen in acute fenitrothion and malathion poisoning
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K, Futagami, N, Tanaka, M, Nishimura, H, Tateishi, T, Aoyama, and R, Oishi
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Male ,Insecticides ,Erythrocytes ,Dose-Response Relationship, Drug ,Poisoning ,Malathion ,Cholinesterases ,Humans ,Female ,Fenitrothion ,Blood Urea Nitrogen ,Retrospective Studies - Abstract
We observed 6 patients with severe fenitrothion and/or malathion poisoning necessitating artificial ventilation and intensive care monitoring. Three developed relapse following acute cholinergic crisis. In these patients the blood urea nitrogen (BUN) abnormally elevated before the development of relapse and the initial high concentration of plasma organophosphate (OP) decreased only gradually. However, the patients who did not develop relapse showed no elevation of BUN and a relatively low concentration of plasma OP. This observation was confirmed in a retrospective search of 14 patients. In addition, erythrocyte cholinesterase (EChE) activities were more helpful to diagnose the development of relapse than plasma cholinesterase activities. Therefore, careful monitoring of BUN in addition to plasma OP concentration may be useful to predict the development of relapse.
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- 1996
16. Piezoelectric photoacoustic spectra of silicon at liquid helium temperature
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H. Matsuyama, A. Nakashima, Tetsuo Ikari, and K. Futagami
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Materials science ,Silicon ,Liquid helium ,business.industry ,Annealing (metallurgy) ,Phonon ,Band gap ,Exciton ,chemistry.chemical_element ,Molecular physics ,Spectral line ,law.invention ,chemistry ,law ,Atomic electron transition ,Optoelectronics ,business - Abstract
Photoacoustic (PA) measurements of p- and n-Si single crystals are carried out at liquid helium temperature (4.2 K). Two peaks are observed around 1.2 eV in both samples. They vanish when the temperature increases to 20 K. The energies of the peaks agree with thresholds of exciton absorption with the emission of momentum-conserving phonons. However, the lower energy peak shifts to the higher energy side with the decrease of the intensity of the incident light. We also observe an annealing behavior of PA spectra of p-Si at 4.2 K. Fine structures of the PA spectra below the band gap were observed. This indicates that the PA measurements at very low temperature may be a useful tool to investigate the electronic transitions
- Published
- 1994
17. Photoacoustic signals from the ion-implanted layer of silicon substrate
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K. Futagami, K. Maeda, and T. Ikari
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Materials science ,Silicon ,business.industry ,Photoconductivity ,chemistry.chemical_element ,Substrate (electronics) ,Epitaxy ,Acceptor ,Ion ,Ion implantation ,chemistry ,Electric field ,Optoelectronics ,business - Abstract
A nonradiative transition in ion-implanted and epitaxially grown layers on Si substrate were measured by a piezoelectric photoacoustic (PA) spectroscopy. It is considered that the observed peak at 1.07 eV is caused by a nonradiative recombination of optically excited electrons from boron acceptor levels. The decrease of the 1.07 eV peak intensity by ion implantation is considered to be due to a formation of surface damaged layer with deep defect levels. The PA spectra of epitaxially grown samples are well explained by summing the spectra of p- and n-type bulk samples. The electric field at the p-n junction is not effective for the PA signal generation mechanism
- Published
- 1993
18. [The development and the applications of clinical laboratory system by using of fuzzy set theory]
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M, Kambe, H, Nishimura, K, Morishita, T, Tsubokura, and K, Futagami
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Databases, Factual ,Diagnosis, Computer-Assisted ,Clinical Laboratory Information Systems - Abstract
For clinical laboratory data to be used effectively in wide areas of clinical medicine, it must be stored in proper database systems. Moreover, the system must be installed in the hospital information system for easy access by the hospital staff in their routine activities. From this standpoint we have developed a clinical test relational database system at Hiroshima University Hospital, which provides the functions of easy on-line retrieval and statistical analysis. We have also improved the functions to incorporate fuzzy query processing based on the theory of fuzzy sets. This system enables us to use natural linguistic representation and leads to a medical knowledge-base.
- Published
- 1991
19. Ultrasonography is an effective diagnostic tool for diseases involving hematochezia
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K FUTAGAMI, K HARUMA, J HATA, J FUJIMURA, M HARA, S MATSUMURA, H KUSUNOKI, Y KITADAI, S TANAKA, and M YOSHIHARA
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Hepatology ,Gastroenterology - Published
- 2001
20. Lipid content of the test meal modifies the result of 13C-acetate breath test
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H KUSUNOKI, K HARUMA, J HATA, K FUTAGAMI, M HARA, S MATSUMURA, S YOSHIDA, Y KITADAI, S TANAKA, and M YOSHIHARA
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Hepatology ,Gastroenterology - Published
- 2001
21. Enprostil lacreases transmural blood perfusion of gastric ulcer-human study by Flash Echo Imaging
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S MATSUMURA, J HATA, K HARUMA, M HARA, K NAKAMURA, H OKANOBU, K FUTAGAMI, S YOSHIDA, H KUSUNOKI, and Y KITADAI
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Hepatology ,Gastroenterology - Published
- 2001
22. Evaluation of esephageal motility by endoscopic ultrasonography in patients with reflux esophagitis
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N MANABE, K HARUMA, J HATA, K FUTAGAMI, S YOSHIDA, M HARA, H KUSUNOKI, Y KITADAI, S TANAKA, and M YOSHIHARA
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Hepatology ,Gastroenterology - Published
- 2001
23. Reduced gastric responses seen in functional dyspepsia to the modified sham feeding
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K NAKAMURA, J HATA, K HARUMA, H KUSUNOKI, S YOSHIDA, S MATSUMURA, K FUTAGAMI, H OKANOBU, M HARA, and S TANAKA
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Hepatology ,Gastroenterology - Published
- 2001
24. Evaluation of flash echo imaging for assessment of blood perfusion in gastric cancer
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H OKANOBU, J HATA, K HARUMA, M HARA, K NAKAMURA, K FUTAGAMI, S MATSUMURA, S YOSHIDA, H KUSUNOKI, and S TANAKA
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Hepatology ,Gastroenterology - Published
- 2001
25. Nucleation of voids in bcc metals
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K. Kitajima, Eiichi Kuramoto, and K. Futagami
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Nuclear and High Energy Physics ,Materials science ,Condensed matter physics ,Niobium ,Nucleation ,chemistry.chemical_element ,Atmospheric temperature range ,Crystallography ,Nuclear Energy and Engineering ,chemistry ,Molybdenum ,Vacancy defect ,General Materials Science ,Irradiation ,Dislocation ,Helium - Abstract
Measurements were made on formation of voids in high pure and He-doped(1~100 appm) bcc metals, iron, molybdenum and niobium, irradiated by electrons in the HVEM. It was found that nucleation of voids occurred in a very narrow temperature range (0.30–0.36 T m ) which is correlated closely with narrow dislocation density range. Helium at ~I appm enhanced the density and swelling of voids, though ~100 appm suppressed the swelling. These effects were interpreted by heterogeneous nucleation in the neighbourhood of dislocations where the local bias factor for defect flux depends on imperfection of sink strength of dislocations, and formation of vacancy clusters of dislocation loop type contribute to recombination.
- Published
- 1979
26. Implementation of a Statistical Database System: HSDB
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H. Ikeda, K. Futagami, and Y. Kobayashi
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Information retrieval ,Interactivity ,business.industry ,Computer science ,Statistical database ,Data management ,Data editing ,Maintainability ,Statistical analysis ,Data dictionary ,business - Abstract
This paper describes an implementation of a statistical database system with real-time response for interactive use, extended data dictionaries, data editing facilities, and special security features. Especially a new approach, use of summary tables, is proposed to improve the responsibility and data dictionaries are expanded to manage special information in statistical environment. The system enhanced interactivity to statistical analysis and maintainability of statistical data rather than a conventional statistical package or a statistical application system of a conventional data management system.
- Published
- 1982
27. Clinical laboratory knowledge-base system--From crisp to fuzzy
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Tokuo Tsubokura, X. Morishita, Haruhiko Nishimura, K. Futagami, and Masayuki Kambe
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Knowledge base ,Computer science ,business.industry ,Relational database ,System testing ,Statistical analysis ,Fuzzy control system ,Data mining ,business ,computer.software_genre ,Fuzzy logic ,computer
28. Application of deep neural survival networks to the development of risk prediction models for diabetes mellitus, hypertension, and dyslipidemia.
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Sasagawa Y, Inoue Y, Futagami K, Nakamura T, Maeda K, Aoki T, Fukubayashi N, Kimoto M, Mizoue T, and Hoshina G
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- Humans, Risk Factors, Neural Networks, Computer, Cardiovascular Diseases etiology, Diabetes Mellitus epidemiology, Hypertension complications, Dyslipidemias complications
- Abstract
Objectives: : Although numerous risk prediction models have been proposed, few such models have been developed using neural network-based survival analysis. We developed risk prediction models for three cardiovascular disease risk factors (diabetes mellitus, hypertension, and dyslipidemia) among a working-age population in Japan using DeepSurv, a deep feed-forward neural network., Methods: : Data were obtained from the Japan Epidemiology Collaboration on Occupational Health Study. A total of 51 258, 44 197, and 31 452 individuals were included in the development of risk models for diabetes mellitus, hypertension, and dyslipidemia, respectively; two-thirds of whom were used to develop prediction models, and the rest were used to validate the models. We compared the performances of DeepSurv-based models with those of prediction models based on the Cox proportional hazards model., Results: : The area under the receiver-operating characteristic curve was 0.878 [95% confidence interval (CI) = 0.864-0.892] for diabetes mellitus, 0.835 (95% CI = 0.826-0.845) for hypertension, and 0.826 (95% CI = 0.817-0.835) for dyslipidemia. Compared with the Cox proportional hazards-based models, the DeepSurv-based models had better reclassification performance [diabetes mellitus: net reclassification improvement (NRI) = 0.474, P ≤ 0.001; hypertension: NRI = 0.194, P ≤ 0.001; dyslipidemia: NRI = 0.397, P ≤ 0.001] and discrimination performance [diabetes mellitus: integrated discrimination improvement (IDI) = 0.013, P ≤ 0.001; hypertension: IDI = 0.007, P ≤ 0.001; and dyslipidemia: IDI = 0.043, P ≤ 0.001]., Conclusion: : This study suggests that DeepSurv has the potential to improve the performance of risk prediction models for cardiovascular disease risk factors., (Copyright © 2023 The Author(s). Published by Wolters Kluwer Health, Inc.)
- Published
- 2024
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29. The renaissance and enlightenment of Marchantia as a model system.
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Bowman JL, Arteaga-Vazquez M, Berger F, Briginshaw LN, Carella P, Aguilar-Cruz A, Davies KM, Dierschke T, Dolan L, Dorantes-Acosta AE, Fisher TJ, Flores-Sandoval E, Futagami K, Ishizaki K, Jibran R, Kanazawa T, Kato H, Kohchi T, Levins J, Lin SS, Nakagami H, Nishihama R, Romani F, Schornack S, Tanizawa Y, Tsuzuki M, Ueda T, Watanabe Y, Yamato KT, and Zachgo S
- Subjects
- Biological Evolution, Germ Cells, Plant, Phylogeny, Embryophyta, Marchantia genetics
- Abstract
The liverwort Marchantia polymorpha has been utilized as a model for biological studies since the 18th century. In the past few decades, there has been a Renaissance in its utilization in genomic and genetic approaches to investigating physiological, developmental, and evolutionary aspects of land plant biology. The reasons for its adoption are similar to those of other genetic models, e.g. simple cultivation, ready access via its worldwide distribution, ease of crossing, facile genetics, and more recently, efficient transformation, genome editing, and genomic resources. The haploid gametophyte dominant life cycle of M. polymorpha is conducive to forward genetic approaches. The lack of ancient whole-genome duplications within liverworts facilitates reverse genetic approaches, and possibly related to this genomic stability, liverworts possess sex chromosomes that evolved in the ancestral liverwort. As a representative of one of the three bryophyte lineages, its phylogenetic position allows comparative approaches to provide insights into ancestral land plants. Given the karyotype and genome stability within liverworts, the resources developed for M. polymorpha have facilitated the development of related species as models for biological processes lacking in M. polymorpha., (© The Author(s) 2022. Published by Oxford University Press on behalf of American Society of Plant Biologists.)
- Published
- 2022
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30. Novel method to analyze cell kinetics for the rapid diagnosis and determination of the causative agent in allergy.
- Author
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Shibaguchi H, Yasutaka Y, and Futagami K
- Subjects
- Allergens immunology, Case-Control Studies, Cell Movement, Dose-Response Relationship, Drug, Drug Hypersensitivity immunology, Early Diagnosis, Flow Cytometry, Humans, Jurkat Cells, Sensitivity and Specificity, Time Factors, Allergens isolation & purification, Chemotactic Factors metabolism, Drug Hypersensitivity diagnosis, Lymphocytes immunology, Rhinitis, Allergic, Seasonal immunology
- Abstract
Drug-induced allergy (DIA), an unexpectedly triggered side effect of drugs used for therapeutic purposes, is a serious clinical issue that needs to be resolved because it interrupts the treatment of the primary disease. Since conventional allergy testing is insufficient to accurately predict the occurrence of DIA or to determine the drugs causing it, the development of diagnostic and predictive tools for allergic reactions is important. We demonstrated a novel method, termed high-sensitive allergy test (HiSAT), for the rapid diagnosis of allergy (within 1 hr; with true-positive diagnosis rates of 89% and 9% for patients with and without allergy-like symptoms, respectively). HiSAT analyzes the cell kinetics as an index against chemotactic factors in a patient's serum, as different from the diagnosis using conventional methods. Once allergy has occurred, HiSAT can be used to determine the causative medicine using culture supernatants incubated with the subject's lymphocytes and the test allergen. This test is more efficient (60%) than the lymphocyte transformation test (20%). Furthermore, in HiSAT, cell mobility significantly increases in a dose-dependent manner against supernatant incubated with lymphocytes from a subject with pollinosis collected at a time when the subject is without allergic symptoms and the antigen. The result demonstraed that HiSAT might be a promising method to rapidly diagnose DIA or to determine with high accuracy the antigen causing allergy., Competing Interests: The authors have declared that no competing interests exist.
- Published
- 2021
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31. An Early Arising Role of the MicroRNA156/529-SPL Module in Reproductive Development Revealed by the Liverwort Marchantia polymorpha.
- Author
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Tsuzuki M, Futagami K, Shimamura M, Inoue C, Kunimoto K, Oogami T, Tomita Y, Inoue K, Kohchi T, Yamaoka S, Araki T, Hamada T, and Watanabe Y
- Subjects
- Base Sequence, Marchantia genetics, MicroRNAs metabolism, Plant Proteins metabolism, RNA, Plant metabolism, Reproduction, Transcription Factors metabolism, Marchantia physiology, MicroRNAs genetics, Plant Proteins genetics, RNA, Plant genetics, Transcription Factors genetics
- Abstract
In angiosperms, the phase transition from vegetative to reproductive growth involves the de-repression of the squamosa promoter-binding-protein-like (SPL) class of transcription factors, which is negatively regulated by the specific microRNAs (miRNAs/miRs) miR156/529 [1]. Non-vascular land plants also undergo growth-phase transition to the reproductive state, but knowledge regarding the controlling mechanisms is limited. Here, we investigate the reproductive transition in the liverwort Marchantia polymorpha, focusing on the roles of miR529c [2-4] and MpSPL2. First, we established mir529c-null mutants using CRISPR/Cas9. Even in the absence of far-red light-supplemented long-day condition, which is usually needed to induce reproductive development [5, 6], the mutant thalli developed sexual reproductive organs (gametangia) and produced gametes. Transgenic plants expressing a miR529-resistant MpSPL2 transgene also showed a similar phenotype of reproductive transition in the absence of inductive far-red light signals. In these mutants and transgenic plants, the MpSPL2 mRNA abundance was elevated. Mpspl2
ko mutant plants showed successful gamete development and fertilization, which suggests that MpSPL2 is involved in, but not essential for, sexual reproduction in M. polymorpha. Furthermore, analysis of Mpspl2ko mutant and its complemented lines suggests that MpSPL2 may have a role in promotion of reproductive transition. These findings support the notion that the transition to reproductive development in liverworts is controlled by a system similar to that in angiosperms, and the miR156/529-SPL module has common significance in the control of the vegetative-to-reproductive transition during development in many land plants, including liverworts., (Copyright © 2019 Elsevier Ltd. All rights reserved.)- Published
- 2019
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32. Influence of Memantine on Continuous Treatment with Rivastigmine Patches-Retrospective Study Using the Logistic Regression Analysis.
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Yasutaka Y, Fujioka S, Terasawa M, Shibaguchi H, Futagami K, Ouma S, Tsuboi Y, and Kamimura H
- Subjects
- Aged, Aged, 80 and over, Drug Therapy, Combination, Female, Humans, Logistic Models, Male, Middle Aged, Retrospective Studies, Alzheimer Disease drug therapy, Memantine administration & dosage, Patient Compliance statistics & numerical data, Rivastigmine administration & dosage, Rivastigmine adverse effects, Transdermal Patch
- Abstract
Rivastigmine patches exhibit stable effects when attached once a day, and may reduce Alzheimer's disease (AD) patient's or caregiver's burden. On the other hand, it was reported that adverse events, such as dermal disorder, frequently appeared after the start of rivastigmine administration. We retrospectively investigated medical records in 120 patients with moderate or mild AD in whom rivastigmine administration was started in the Department of Neurology, Fukuoka University Hospital between July 2011 and June 2014 (43 males, 77 females, mean age: 76.9±8.0 years). In 72 patients (60.0%), rivastigmine administration was discontinued within 52 weeks after its start. In 45 of these, it was discontinued before reaching a dose of 18 mg/d which was proven to be effective for AD patients. A primary reason for discontinuation was the appearance or deterioration of adverse events in 64 patients. Of these, 43 complained of dermal disorder, accounting for the highest percentage. To clarify factors influencing the continuous administration of rivastigmine, multivariate analysis was performed in 114 patients meeting criteria. Combination therapy with memantine was extracted as a factor (p=0.008). The results of this study suggest that adherence to combination therapy with rivastigmine and memantine is more favorable than that to monotherapy with rivastigmine.
- Published
- 2017
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33. Change of teicoplanin loading dose requirement for incremental increases of systemic inflammatory response syndrome score in the setting of sepsis.
- Author
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Nakano T, Nakamura Y, Takata T, Irie K, Sano K, Imakyure O, Mishima K, and Futagami K
- Subjects
- Aged, Bayes Theorem, Case-Control Studies, Female, Humans, Male, Middle Aged, Retrospective Studies, Sepsis blood, Sepsis complications, Systemic Inflammatory Response Syndrome blood, Systemic Inflammatory Response Syndrome complications, Systemic Inflammatory Response Syndrome drug therapy, Teicoplanin blood, Drug Administration Schedule, Sepsis drug therapy, Systemic Inflammatory Response Syndrome diagnosis, Teicoplanin administration & dosage, Teicoplanin pharmacokinetics
- Abstract
Background Target trough concentrations are recommended for teicoplanin (TEIC) to minimize its adverse effects and to maximize efficacy in sepsis caused by grampositive cocci, including methicillin-resistant Staphylococcus aureus infection. However, optimal doses to attain proper trough values in patients with sepsis have not yet been well established for TEIC. Objective This study investigated whether the systemic inflammatory response syndrome (SIRS) score could predict the pharmacokinetics of TEIC in patients with sepsis. Setting This study was conducted at Fukuoka University Hospital in Japan. Methods We retrospectively reviewed the records of patients using TEIC between April 2012 and March 2015. SIRS positive was defined as infection with a SIRS score ≥2. Estimates of pharmacokinetic parameters were calculated using a Bayesian method. Creatinine clearance rates were estimated by the Cockcroft-Gault formula (eCcr). Main outcome measure Change of TEIC loading dose requirement for incremental increases of SIRS score. Results In total, 133 patients were enrolled: 50 non-SIRS patients and 83 patients with SIRS. The TEIC plasma trough concentration was significantly lower in SIRS than non-SIRS patients (15.7 ± 7.1 vs. 20.1 ± 8.6 μg/mL; P < 0.01), although there was no significant difference in the loading dose administered. Moreover, SIRS scores were increasingly predictive of eCcr and TEIC clearance in a stepwise manner. To achieve the target trough concentration (15-30 μg/mL), the optimal doses required in non-SIRS versus SIRS patients were 12-24 versus 18-30 mg/kg/day, respectively, during the first 48 h. Conclusions These findings suggest that the pharmacokinetics of TEIC are altered in SIRS patients, who required higher doses than non-SIRS patients to achieve the target trough concentration. We suggest that the SIRS score can become a new modality to determine the initial TEIC loading dose.
- Published
- 2016
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34. [Continued Use of Rotigotine Transdermal Patches for Parkinson Disease].
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Yasutaka Y, Fujioka S, Shibaguchi H, Imakyure O, Washiyama A, Tsuboi Y, and Futagami K
- Subjects
- Administration, Cutaneous, Adult, Aged, Aged, 80 and over, Dopamine Agonists administration & dosage, Dopamine Agonists adverse effects, Female, Humans, Male, Middle Aged, Retrospective Studies, Risk Factors, Tetrahydronaphthalenes administration & dosage, Tetrahydronaphthalenes adverse effects, Thiophenes administration & dosage, Thiophenes adverse effects, Dopamine Agonists therapeutic use, Parkinson Disease drug therapy, Tetrahydronaphthalenes therapeutic use, Thiophenes therapeutic use
- Abstract
Transdermal patches containing rotigotine, a dopamine agonist (DA) for treatment of Parkinson disease, continuously exert stable effects when applied once daily. Therefore, they are expected to reduce the patient burdens due to complications such as wearing-off and dysphagia. However, dosing is occasionally reduced or discontinued after application because of several reasons such as skin reactions or unsatisfactory efficacy. To identify the risk factors involved in the reduced or discontinued use of rotigotine patches, a retrospective study was conducted with reference to the medical records of patients with Parkinson disease who received rotigotine patches in our hospital. 85 patients were involved in this study. Dosing of rotigotine was reduced or discontinued in 53 patients during the study period. The factors associated with charges in treatment included combination therapy with clonazepam and oral administration of another DA before the application of rotigotine. The reduction or discontinuation rate of rotigotine patches in patients who reduced the equivalent dose of DA on the introduction of rotigotine patches was 94.7%, showing a significantly higher rate compared with 61.3% in the increased dose group. To improve adherence to rotigotine patch therapy, physicians need to carefully consider concomitant drugs and total dose of DAs. (Received December 7, 2015; Accepted February 22, 2016; Published June 1, 2016).
- Published
- 2016
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35. Delayed treatment with ADAMTS13 ameliorates cerebral ischemic injury without hemorrhagic complication.
- Author
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Nakano T, Irie K, Hayakawa K, Sano K, Nakamura Y, Tanaka M, Yamashita Y, Satho T, Fujioka M, Muroi C, Matsuo K, Ishikura H, Futagami K, and Mishima K
- Subjects
- ADAMTS13 Protein, Animals, Brain Ischemia blood, Brain Ischemia complications, Cerebral Hemorrhage drug therapy, Cerebral Hemorrhage etiology, Cerebral Infarction drug therapy, Cerebral Infarction etiology, Cerebrovascular Circulation drug effects, Disease Models, Animal, HMGB1 Protein blood, Laser-Doppler Flowmetry, Male, Mice, Mice, Inbred Strains, Neurologic Examination, Time Factors, Tissue Plasminogen Activator therapeutic use, ADAM Proteins therapeutic use, Brain Ischemia drug therapy, Fibrinolytic Agents therapeutic use
- Abstract
Tissue plasminogen activator (tPA) is the only approved therapy for acute ischemic stroke. However, delayed tPA treatment increases the risk of cerebral hemorrhage and can result in exacerbation of nerve injury. ADAMTS13, a von Willebrand factor (VWF) cleaving protease, has a protective effect against ischemic brain injury and may reduce bleeding risk by cleaving VWF. We examined whether ADAMTS13 has a longer therapeutic time window in ischemic stroke than tPA in mice subjected to middle cerebral artery occlusion (MCAO). ADAMTS13 (0.1mg/kg) or tPA (10mg/kg) was administered i.v., immediately after reperfusion of after 2-h or 4-h MCAO for comparison of the therapeutic time windows in ischemic stroke. Infarct volume, hemorrhagic volume, plasma high-mobility group box1 (HMGB1) levels and cerebral blood flow were measured 24h after MCAO. Both ADAMTS13 and tPA improved the infarct volume without hemorrhagic complications in 2-h MCAO mice. On the other hand, ADAMTS13 reduced the infarct volume and plasma HMGB1 levels, and improved cerebral blood flow without hemorrhagic complications in 4-h MCAO mice, but tPA was not effective and these animals showed massive intracerebral hemorrhage. These results indicated that ADAMTS13 has a longer therapeutic time window in ischemic stroke than tPA, and ADAMTS13 may be useful as a new therapeutic agent for ischemic stroke., (Copyright © 2015 Elsevier B.V. All rights reserved.)
- Published
- 2015
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36. Elevated permeability of the blood-brain barrier in mice intratracheally administered porcine pancreatic elastase.
- Author
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Takata F, Tominaga K, Koga M, Dohgu S, Futagami K, Yamauchi A, and Kataoka Y
- Subjects
- Administration, Inhalation, Animals, Bronchoalveolar Lavage Fluid cytology, Disease Models, Animal, Evans Blue metabolism, Fluorescein metabolism, Leukocyte Count, Mice, Neutrophils, Oxygen blood, Pancreatic Elastase administration & dosage, Permeability, Swine, Blood-Brain Barrier metabolism, Blood-Brain Barrier physiopathology, Pancreatic Elastase adverse effects, Pulmonary Disease, Chronic Obstructive chemically induced, Pulmonary Disease, Chronic Obstructive metabolism, Pulmonary Disease, Chronic Obstructive physiopathology
- Abstract
Chronic obstructive pulmonary disease (COPD) shows progressive, irreversible airflow limitation induced by emphysema and lung inflammation. The aim of the present study was to determine if COPD conditions induce blood-brain barrier (BBB) dysfunction. We found that the intratracheal administration of porcine pancreatic elastase (PPE; 3 U) induced alveolar enlargement, increased neutrophil number in bronchoalveolar lavage fluid, and decreased blood oxygen saturation in mice at 21 days after inhalation. In parallel with these lung damages, BBB permeability to sodium fluorescein and Evans blue albumin was markedly increased. Our findings demonstrate that COPD conditions are associated with risk for BBB impairment., (Copyright © 2015 The Authors. Production and hosting by Elsevier B.V. All rights reserved.)
- Published
- 2015
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37. Tumor necrosis factor-α reduces beta-amyloid accumulation primarily by lowering cellular prion protein levels in a brain endothelial cell line.
- Author
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Yasutaka Y, Watanabe T, Nakashima A, Matsumoto J, Futagami K, Yamauchi A, and Kataoka Y
- Subjects
- Animals, Cell Line, Mice, Amyloid beta-Peptides metabolism, Brain metabolism, Prions metabolism, Tumor Necrosis Factor-alpha metabolism
- Abstract
Disruption of beta-amyloid (Aβ) transport across the blood-brain barrier is thought to cause Aβ accumulation in the brain, thus leading to the development of Alzheimer's disease (AD). As AD patients show increased serum tumor necrosis factor-α (TNFα) levels, we examined the effect of TNFα on the function and expression of Aβ transport-related proteins including cellular prion protein (PrP(C)) in the mouse brain microvascular endothelial cell line MBEC4. TNFα decreased PrP(C) levels and intracellular radiolabeled Aβ. Similarly, anti-prion protein antibody also decreased radiolabeled Aβ. These results suggest that TNFα lowers PrP(C) levels, which in turn, reduces Aβ in the brain endothelium., (Copyright © 2014 Federation of European Biochemical Societies. Published by Elsevier B.V. All rights reserved.)
- Published
- 2015
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38. [The timing of the appearance of oral mucositis induced by concurrent chemoradiotherapy with S-1 for head and neck cancer].
- Author
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Yonekita H, Takase H, Ogata K, Futagami K, Nomoto S, Yoshimitsu K, Nakagawa T, and Tokunaga S
- Subjects
- Aged, Antineoplastic Combined Chemotherapy Protocols therapeutic use, Drug Combinations, Female, Humans, Male, Oxonic Acid administration & dosage, Oxonic Acid adverse effects, Retrospective Studies, Tegafur administration & dosage, Tegafur adverse effects, Time Factors, Antineoplastic Combined Chemotherapy Protocols adverse effects, Chemoradiotherapy adverse effects, Head and Neck Neoplasms therapy, Stomatitis etiology
- Abstract
Oral mucositis is a frequent adverse event in patients receiving concurrent chemoradiotherapy for head and neck cancer. Although the management of oral mucositis is essential to improve treatment completion rates, no detailed studies on the time of oral mucositis appearance have been reported. We conducted a retrospective study on the timing of the appearance of oral mucositis induced by concurrent chemoradiotherapy with S-1 for head and neck cancer. A total of 11 patients with head and neck cancer who received concurrent chemoradiotherapy with S-1 were examined. All patients developed oral mucositis within 13.8 ± 5.6 days after the initiation of radiotherapy (20.4 ± 8.1 Gy). In addition, the effects of pain-associated symptoms caused by oral mucositis on the patients' nutritional status, including reduction in caloric intake (24.4% ± 31.1%), weight loss (5.2% ± 5.2%), and duration of a regular diet (24.5 ± 17.1 days), were observed and lasted until the completion of radiation therapy. The delineation of the timing of oral mucositis appearance has become a key motivator for the patients to perform oral care proactively to limit severity and serves as a necessary index for monitoring oral health and managing pain and nutrition.
- Published
- 2014
39. Tumor necrosis factor-α-stimulated brain pericytes possess a unique cytokine and chemokine release profile and enhance microglial activation.
- Author
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Matsumoto J, Takata F, Machida T, Takahashi H, Soejima Y, Funakoshi M, Futagami K, Yamauchi A, Dohgu S, and Kataoka Y
- Subjects
- Animals, Astrocytes metabolism, Endothelial Cells metabolism, Interleukin-1beta metabolism, Nitric Oxide Synthase metabolism, Pericytes drug effects, Primary Cell Culture, RNA, Messenger metabolism, Rats, Rats, Wistar, Tumor Necrosis Factor-alpha pharmacology, Blood-Brain Barrier metabolism, Chemokines metabolism, Cytokines metabolism, Encephalitis metabolism, Microglia metabolism, Pericytes metabolism, Tumor Necrosis Factor-alpha metabolism
- Abstract
Brain pericytes are involved in neurovascular dysfunction, neurodegeneration and/or neuroinflammation. In the present study, we focused on the proinflammatory properties of brain pericytes to understand their participation in the induction of inflammation at the neurovascular unit (NVU). The NVU comprises different cell types, namely, brain microvascular endothelial cells, pericytes, astrocytes and microglia. Among these, we found pericytes to be the most sensitive to tumor necrosis factor (TNF)-α, possessing a unique cytokine and chemokine release profile. This was characterized by marked release of interleukin (IL)-6 and macrophage inflammatory protein-1α. Furthermore, TNF-α-stimulated pericytes induced expression of inducible nitric oxide synthase and IL-1β mRNAs, as an index of BV-2 microglial cell activation state, to the highest levels. Based on these findings, the possibility that brain pericytes act specifically as TNF-α-sensitive cells and as effectors of TNF-α through the release of proinflammatory factors, and that, as such, they have a role in inducing brain inflammation, should be considered., (Copyright © 2014 Elsevier Ireland Ltd. All rights reserved.)
- Published
- 2014
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40. Involvement of CXCL14 in osteolytic bone metastasis from lung cancer.
- Author
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Takiguchi S, Korenaga N, Inoue K, Sugi E, Kataoka Y, Matsusue K, Futagami K, Li YJ, Kukita T, Teramoto N, and Iguchi H
- Subjects
- Animals, Bone Neoplasms secondary, Cell Line, Tumor, Cell Movement, Chemokines, CXC genetics, Humans, Lung Neoplasms etiology, Macrophages metabolism, Male, Mice, Osteoblasts metabolism, Osteoblasts pathology, Osteoclasts pathology, Osteolysis complications, RNA Interference, RNA, Small Interfering, Rats, Rats, Sprague-Dawley, Bone Neoplasms pathology, Chemokines, CXC biosynthesis, Lung Neoplasms pathology, Osteolysis pathology
- Abstract
To investigate the molecular mechanisms of lung cancer-induced bone metastasis, we established a bone-seeking subclone (HARA-B4) from a human squamous lung cancer cell line (HARA) using an in vivo selection method. We compared comprehensive gene expression profiles between HARA and HARA-B4, and identified the critical factors for the formation of bone metastasis using in vitro and in vivo assays. The number of bone metastatic colonies in the hind legs was significantly higher in HARA-B4-inoculated mice than in HARA-inoculated mice at 4 weeks after inoculation. In addition, visceral (adrenal) metastases were not found in HARA-B4-inoculated mice at autopsy, suggesting an increase in cancer cell tropism to bone in HARA-B4. Based on a comprehensive gene expression analysis, the expression level of CXC chemokine ligand 14 (CXCL14) was 5-fold greater in HARA-B4 than in HARA. Results of a soft agar colony formation assay showed that anchorage-independent growth ability was 4.5-fold higher with HARA-B4 than with HARA. The murine pre-osteoblast cell line MC3T3-E1 and the pre-osteoclast/macrophage cell line RAW264.7 migrated faster toward cultured HARA-B4 cells than toward HARA cells in a transwell cell migration assay. Interestingly, CXCL14 was shown to be involved in all events (enhancement of cancer cell tropism to the bone, anchorage-independent growth and/or recruitment of bone marrow cells) based on siRNA experiments in HARA-B4 cells. Furthermore, in clinical specimens of lung cancer-induced bone metastasis, expression of CXCL14 was observed in the tumor cells infiltrated in bone marrow in all specimens examined. CXCL14 was able to promote bone metastasis through enhancement of cancer cell tropism to the bone and/or recruitment of bone marrow cells around metastatic cancer cells.
- Published
- 2014
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41. [Necessity of personalized initial loading dose calculation of teicoplanin by clinical pharmacist-examination of the utility of using systemic inflammatory response syndrome score-].
- Author
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Nakano T, Nakamura Y, Togawa A, Takata T, Ishikura H, Mishima K, and Futagami K
- Subjects
- Aged, Anti-Bacterial Agents adverse effects, Anti-Bacterial Agents blood, Female, Humans, Male, Middle Aged, Pharmacists, Precision Medicine, Teicoplanin adverse effects, Teicoplanin blood, Anti-Bacterial Agents administration & dosage, Systemic Inflammatory Response Syndrome, Teicoplanin administration & dosage
- Abstract
When teicoplanin (TEIC) is injected at the maintenance dose, a long period is required for achievement of the target plasma trough concentration because of its long elimination half-life. An initial loading dose is necessary for rapid achievement of an effective plasma trough concentration. Thus, we proposed that it is necessary for a pharmacist determine the initial loading dose of TEIC to reach an effective plasma trough concentration rapidly after its administration to a patient. In the present study, we evaluated the effectiveness of initial loading dose determination by pharmacists and physicians by comparing the achievement rate of target plasma trough concentrations (>15 μg/mL) and expression of adverse effects. Among 61 patients, 34 were treated according to an initial loading dose determined by a pharmacist (pharmacist intervention) and 27 were treated according to the treating physician's discretion (non-pharmacist intervention). The achievement rate of target concentrations was 91.2% (plasma trough concentration 23.3±5.3 μg/mL) in the pharmacist intervention group and 25.9% (plasma trough concentration 14.0±5.9 μg/mL) in the non-pharmacist intervention group. There was no difference in the incidence of adverse effects between the two groups. Also, we found that systemic inflammatory response syndrome (SIRS) may have a correlation with plasma trough concentrations of TEIC. We suggest that the SIRS score could become a means way of determining initial loading dose. These findings suggest that it is potentially effective for a pharmacist to determine this initial dose in order to rapidly achieve the target plasma trough concentration of TEIC.
- Published
- 2014
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42. [Evaluation of the resident pharmacist program of Fukuoka University Hospital].
- Author
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Washiyama A, Otsuka M, and Futagami K
- Subjects
- Hospitals, University, Japan, Pharmacists, Education, Pharmacy, Internship and Residency
- Abstract
Fukuoka University Hospital began to employ a resident pharmacist system in 2006. In the present study, to evaluate our resident program, we conducted a questionnaire survey of graduates who completed program as well as staff of the Pharmaceutical Department of this hospital. In addition, based on the results of this survey, we examined the current state and future of postgraduate training programs that can be offered to those who have completed a 6-year pharmacy course. The proportion of residents and staff who responded to the survey was 76.5% (13/17) and 100% (42/42), respectively. Of these two groups, the program was rated as beneficial by 92% and 72%, respectively. Regarding the contents of the training program, both residents and staff highly evaluated guidance on drug management on wards and the preparation of drugs (including anti-cancer agents) because these were useful for actual work. The necessity and usefulness of a resident program under the 6-year course system were also suggested. According to those graduating from a 6-year pharmacy course, a training program should include training instructions for students in a long-term internship during the 1st year, and specialty pharmacist education during the 2nd year. The results of our study suggest that it is advisable to begin to provide graduates on a 6-year course who participate in a resident program with specialized education focused on ward duties from the latter half of the 1st year based on their undergraduate education.
- Published
- 2014
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43. Paracellular barrier and tight junction protein expression in the immortalized brain endothelial cell lines bEND.3, bEND.5 and mouse brain endothelial cell 4.
- Author
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Watanabe T, Dohgu S, Takata F, Nishioku T, Nakashima A, Futagami K, Yamauchi A, and Kataoka Y
- Subjects
- Animals, Cell Line, Cell Survival, Claudin-5 analysis, Immunohistochemistry, Mice, Mice, Inbred BALB C, Mice, Inbred ICR, Occludin analysis, Zonula Occludens-1 Protein analysis, Blood-Brain Barrier, Brain blood supply, Endothelial Cells metabolism, Tight Junction Proteins analysis
- Abstract
The blood-brain barrier (BBB) is formed by brain endothelial cells. Many immortalized brain endothelial cell lines have been established; these have been used as in vitro BBB models. The aim of the present study was to assess the paracellular barrier properties of the immortalized mouse brain endothelial cell lines bEND.3, bEND.5 cells, and mouse brain endothelial cell 4 (MBEC4), and those of the primary mouse brain endothelial cells pMBECs. bEND.3 cells showed low permeability to sodium fluorescein and obvious staining of tight junction proteins (claudin-5, occludin and ZO-1) similar to pMBECs; these barrier properties of MBEC4 and bEND.5 cells were low. In addition, bEND.3 cells expressed the highest level of claudin-5 among all cells. These results suggest that bEND.3 cells are a convenient and useful model for evaluating BBB function, especially the paracellular barrier.
- Published
- 2013
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44. Atorvastatin stimulates neuroblastoma cells to induce neurite outgrowth by increasing cellular prion protein expression.
- Author
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Watanabe T, Yasutaka Y, Nishioku T, Nakashima A, Futagami K, Yamauchi A, and Kataoka Y
- Subjects
- Animals, Atorvastatin, Cell Line, Tumor, Mice, Neurites drug effects, Neuroblastoma, Reverse Transcriptase Polymerase Chain Reaction, Heptanoic Acids pharmacology, Hydroxymethylglutaryl-CoA Reductase Inhibitors pharmacology, Neurites metabolism, Prions metabolism, Pyrroles pharmacology
- Abstract
Recently, 3-hydroxy-3-methyl glutaryl coenzyme A (HMG-CoA) reductase inhibitors were reported to induce neurite outgrowth in vitro. However, the mechanism underlying this effect remains unclear. Cellular prion protein (PrP(C)) is a ubiquitous glycoprotein present on the surfaces of various cells, including neurons, and is suggested to be involved in neurite outgrowth. Therefore, the present study aimed to determine whether PrP(C) mediates neurite outgrowth induced by HMG-CoA reductase inhibitors. Atorvastatin, a strong HMG-CoA reductase inhibitor, induced neurite outgrowth and increased PrP(C) levels in Neuro2a cells in a time- and dose-dependent manner. PrP(C) mRNA expression was also increased by atorvastatin. Farnesol, a non-sterol mevalonate derivative, attenuated the atorvastatin-induced neurite outgrowth and increase in PrP(C). Neuro2a cells overexpressing PrP(C) showed a remarkable enhancement of atorvastatin-induced neurite outgrowth compared with mock cells transfected with empty pCI-neo vector. These findings suggest that PrP(C) contributes, at least in part, to atorvastatin-induced neurite outgrowth. This phenomenon may be included among the mechanisms underlying decreased risk of Alzheimer's disease in patients treated with HMG-CoA reductase inhibitors., (Copyright © 2012 Elsevier Ireland Ltd. All rights reserved.)
- Published
- 2012
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45. [Establishment of an educational program concerning adverse drug reaction reporting-system in long-term practical training at a hospital].
- Author
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Yamamoto T, Ueno M, Ueyama M, Okamura A, Washiyama A, Shibaguchi H, and Futagami K
- Subjects
- Clinical Competence, Diagnostic Self Evaluation, Drug-Related Side Effects and Adverse Reactions epidemiology, Hospitals, University, Humans, Japan, Personal Satisfaction, Time Factors, Adverse Drug Reaction Reporting Systems, Education, Pharmacy, Problem-Based Learning, Students, Pharmacy psychology
- Abstract
The model core curriculum for pharmaceutical education specifies the specific behavioral objectives (SBOs) concerning adverse drug reactions, which aims to train pharmacy students to manage adverse drug reactions. Fukuoka University Hospital has developed a problem-based learning (PBL) program concerning adverse drug reactions as long-term practical training to collect adverse event information, identify adverse effects, and acquire management skills. Students' level of satisfaction with the program was high (approximately 90%), and the mean self-evaluation score for the SBOs concerning adverse reaction was 4.4 (5-grade scale), showing a high level of understanding. In addition, students' will of participation to the adverse drug reaction-reporting system was significantly improved after the PBL program, showing the usefulness of this program (p=0.02). However, the results of the PBL program revealed students' insufficient knowledge of adverse reactions and lack of reviewing skills, suggesting the need to improve the education system whereby students can learn adverse drug reactions in clinical settings.
- Published
- 2012
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46. A role for hypothalamic AMP-activated protein kinase in the mediation of hyperphagia and weight gain induced by chronic treatment with olanzapine in female rats.
- Author
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Sejima E, Yamauchi A, Nishioku T, Koga M, Nakagama K, Dohgu S, Futagami K, and Kataoka Y
- Subjects
- Animals, Body Weight drug effects, Eating drug effects, Female, Hyperphagia metabolism, Olanzapine, Rats, Rats, Sprague-Dawley, AMP-Activated Protein Kinases metabolism, Antipsychotic Agents pharmacology, Benzodiazepines pharmacology, Hyperphagia chemically induced, Hypothalamus drug effects, Hypothalamus enzymology, Weight Gain drug effects
- Abstract
Olanzapine is known to be advantageous with respect to outcome and drug compliance in patients with schizophrenia. However, olanzapine has adverse effects, including a higher incidence of weight gain and metabolic disturbances, when compared with those of other antipsychotic agents. The mechanisms underlying these adverse events remain obscure. Female rats were orally administered olanzapine (2 mg/kg) or vehicle once a day for 2 weeks to ascertain if hypothalamic AMP-activated protein kinase (AMPK) mediates olanzapine-induced weight gain and hyperphagia. Body weight and food intake in each rat were evaluated every day and every two days, respectively. After the termination of drug treatment, we measured the protein levels of AMPK and phosphorylated AMPK in the hypothalamus using western blot analyses. Olanzapine significantly increased body weight and food intake. The phosphorylation levels of AMPK were significantly elevated by olanzapine. These results suggest that activation of hypothalamic AMPK may mediate hyperphagia and weight gain induced by chronic treatment with olanzapine.
- Published
- 2011
- Full Text
- View/download PDF
47. Involvement of the cellular prion protein in the migration of brain microvascular endothelial cells.
- Author
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Watanabe T, Yasutaka Y, Nishioku T, Kusakabe S, Futagami K, Yamauchi A, and Kataoka Y
- Subjects
- Animals, Cell Line, Cell Proliferation, Mice, Organ Specificity, Tissue Distribution, Brain physiology, Cell Movement physiology, Endothelial Cells physiology, Microvessels physiology, PrPC Proteins metabolism
- Abstract
The conversion of cellular prion protein (PrP(C)) to its protease-resistant isoform is involved in the pathogenesis of prion disease. Although PrP(C) is a ubiquitous glycoprotein that is present in various cell types, the physiological role of PrP(C) remains obscure. The present study aimed to determine whether PrP(C) mediates migration of brain microvascular endothelial cells. Small interfering RNAs (siRNAs) targeting PrP(C) were transfected into a mouse brain microvascular endothelial cell line (bEND.3 cells). siPrP1, selected among three siRNAs, reduced mRNA and protein levels of PrP(C) in bEND.3 cells. Cellular migration was evaluated with a scratch-wound assay. siPrP1 suppressed migration without significantly affecting cellular proliferation. This study provides the first evidence that PrP(C) may be necessary for brain microvascular endothelial cells to migrate into damaged regions in the brain. This function of PrP(C) in the brain endothelium may be a mechanism by which the neurovascular unit recovers from an injury such as an ischemic insult., (Copyright © 2011 Elsevier Ireland Ltd. All rights reserved.)
- Published
- 2011
- Full Text
- View/download PDF
48. Evaluation of a practical training program for drug information services for fifth-year pharmacy students in a hospital.
- Author
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Yamamoto T, Yuda T, Arimoto A, Sejima E, Kawahara Y, Washiyama A, and Futagami K
- Subjects
- Hospitals, Humans, Personal Satisfaction, Professional Role, Curriculum, Drug Information Services, Education, Pharmacy methods, Students, Pharmacy psychology
- Abstract
Drug information (DI) services is an essential resource for pharmacists to provide counseling to patients and guide appropriate medication use. We devised a DI practical training course that incorporated an inquiry-based practical training program and evaluated its effectiveness. A total of 91 fifth-year students in Pharmaceutical Sciences at Fukuoka University took part in the following DI sessions based on specific behavioral objectives (SBOs) for DI in the Model Core Curriculum for Practical Training: inquiry practice, simulated pharmacy and therapeutics committee, DI newsletter, use of emergency and safety information, off-label use in clinical trials, PRE-AVOID (Be prepared to avoid the adverse drug reactions), adverse drug reactions, and small group discussions about drug poisoning. The level of understanding of the SBOs for DI training was >4.2 for each item assessed, and the level of satisfaction for each practice was >3.9. This DI practical training successfully facilitated students' ability to provide DI. The number of students interested in DI services significantly increased (p<0.01). After the DI practical training, many students made statements such as "I realized that DI services is a very important job" and "I feel that pharmacists have much to contribute to DI services by evaluating the most appropriate information from a pharmacist's standpoint." It appears that students recognized the pharmacist's role and importance of DI services in clinical practice through the DI training. These results suggest that this DI practical training program was effective.
- Published
- 2011
- Full Text
- View/download PDF
49. Measurement and assessment of cytomegalovirus of immunoglobulin (Ig) g titer in preparations.
- Author
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Shibaguchi H, Yamamoto T, Kuroki M, and Futagami K
- Subjects
- Antibodies, Neutralizing, Immunoenzyme Techniques methods, Immunoglobulins, Neutralization Tests methods, Antibodies, Viral analysis, Cytomegalovirus immunology, Immunoglobulin G analysis, Immunoglobulins, Intravenous chemistry
- Abstract
Cytomegalovirus (CMV) remains the most important pathogen following solid organ transplantation and is the major cause of recipient morbidity and mortality during the first 6 months posttransplantation. To prevent CMV infection and/or to prevent symptomatic CMV disease, immunoglobulin (Ig) G including hyperimmune CMV IgG are used alone or in combination with antiviral medications. The CMV IgG titer, however, has a wide range and frequently depends on the company supplying the Ig preparation even if the preparations come from the plasma pool of a national blood donation agency. In the present study, we therefore simultaneously measured and evaluated the CMV IgG titers in various Ig preparations using two common methods: the neutralizing antibody (NT) and enzyme immunoassay (EIA). The CMV IgG titer in the present study indicated different values using both methods among Ig preparations that were made from the plasma pool of a national blood donation agency (about 3.5- or about 1.7-fold difference using the NT or EIA methods, respectively). Furthermore, there were no correlations in the CMV IgG titer between our findings and published data from the manufacturers, or between the two methods tested here. These findings suggest the importance and necessity of a standard method and/or sample for the measurement and assessment of CMV IgG in Ig preparations.
- Published
- 2010
- Full Text
- View/download PDF
50. [Establishment of a system for early exposure provided by new pharmacists in a hospital].
- Author
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Yamamoto T, Washiyama A, Sejima E, Shibaguchi H, Kataoka Y, and Futagami K
- Subjects
- Faculty, Humans, Learning, Motivation, Surveys and Questionnaires, Education, Pharmacy trends, Pharmacists psychology, Pharmacy Service, Hospital, Students, Pharmacy psychology
- Abstract
It is very important for students to undergo early exposure in 6-year pharmaceutical education; through this experience they will understand roles of pharmacists, map out their future career, and increase their motivation for learning. Therefore we had newly recruited pharmacists provide an early exposure program in a hospital. According to the results of a questionnaire survey involving students, educational staff of the Faculty of Pharmaceutical Sciences and the new pharmacists, 99% of the students were satisfied with the program, and their motivation for learning was enhanced. Interestingly, they were more careful regarding their grooming and appearance after completing the program. Educational staff of the Faculty of Pharmaceutical Sciences evaluated the new pharmacists and their teaching very positively, and, in turn, the pharmacists assessed an early exposure program in a hospital as significant. Therefore we conclude that the system for early exposure was useful for both students and new pharmacists.
- Published
- 2010
- Full Text
- View/download PDF
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