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Shimoda M, Oda S, Hirayama A, Imai M, Komatsu F, Hoshikawa K, Shigematsu H, Nishiyama J, Osada T. Centripetal Propagation of Vasoconstriction at the Time of Headache Resolution in Patients with Reversible Cerebral Vasoconstriction Syndrome. AJNR Am J Neuroradiol 2016; 37:1594-8. [PMID: 27079368 DOI: 10.3174/ajnr.a4768] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2015] [Accepted: 02/05/2016] [Indexed: 11/07/2022]
Abstract
BACKGROUND AND PURPOSE Reversible cerebral vasoconstriction syndrome is characterized by thunderclap headache and diffuse segmental vasoconstriction that resolves spontaneously within 3 months. Previous reports have proposed that vasoconstriction first involves small distal arteries and then progresses toward major vessels at the time of thunderclap headache remission. The purpose of this study was to confirm centripetal propagation of vasoconstriction on MRA at the time of thunderclap headache remission compared with MRA at the time of reversible cerebral vasoconstriction syndrome onset. MATERIALS AND METHODS Of the 39 patients diagnosed with reversible cerebral vasoconstriction syndrome at our hospital during the study period, participants comprised the 16 patients who underwent MR imaging, including MRA, within 72 hours of reversible cerebral vasoconstriction syndrome onset (initial MRA) and within 48 hours of thunderclap headache remission. RESULTS In 14 of the 16 patients (87.5%), centripetal propagation of vasoconstriction occurred from the initial MRA to remission of thunderclap headache, with typical segmental vasoconstriction of major vessels. These mainly involved the M1 portion of the MCA (10 cases), P1 portion of the posterior cerebral artery (10 cases), and A1 portion of the anterior cerebral artery (5 cases). CONCLUSIONS This study found evidence of centripetal propagation of vasoconstriction on MRA obtained at the time of thunderclap headache remission, compared with MRA obtained at the time of reversible cerebral vasoconstriction syndrome onset. If clinicians remain unsure of the diagnosis during early-stage reversible cerebral vasoconstriction syndrome, this time point represents the best opportunity to diagnose reversible cerebral vasoconstriction syndrome with confidence.
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Kawamura F, Yamada N, Imai M, Taniguchi T. Synthesis of ZnSnN2crystals via a high-pressure metathesis reaction. CRYSTAL RESEARCH AND TECHNOLOGY 2016. [DOI: 10.1002/crat.201500258] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Oda S, Shimoda M, Hirayama A, Imai M, Komatsu F, Shigematsu H, Nishiyama J, Matsumae M. Reply: To PMID 25977479. AJNR Am J Neuroradiol 2015; 36:E64. [PMID: 26185327 DOI: 10.3174/ajnr.a4480] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Imai M, Arimura H, Nonaka A, Nakamura K, Shioyama Y, Honda H, Hirata H. SU-E-T-696: Similar-Case-Based Framework of Beam Angle Configurations Using Treatment-Plan-Related Features in Lung Stereotactic Body Radiation Therapy. Med Phys 2015. [DOI: 10.1118/1.4925060] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Oda S, Shimoda M, Hirayama A, Imai M, Komatsu F, Shigematsu H, Nishiyama J, Matsumae M. Neuroradiologic Diagnosis of Minor Leak prior to Major SAH: Diagnosis by T1-FLAIR Mismatch. AJNR Am J Neuroradiol 2015; 36:1616-22. [PMID: 25977479 DOI: 10.3174/ajnr.a4325] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2014] [Accepted: 02/09/2015] [Indexed: 11/07/2022]
Abstract
BACKGROUND AND PURPOSE In major SAH, the only method to diagnose a preceding minor leak is to ascertain the presence of a warning headache by interview; however, poor clinical condition and recall bias can cause inaccuracy. We devised a neuroradiologic method to diagnose previous minor leak in patients with SAH and attempted to determine whether warning (sentinel) headaches were associated with minor leaks before major SAH. MATERIALS AND METHODS We retrospectively evaluated 127 patients who were admitted with SAH within 48 hours of ictus. Previous minor leak before major SAH was defined as T1WI-detected clearly bright hyperintense subarachnoid blood accompanied by SAH blood on FLAIR images that was distributed over a larger area than bright hyperintense subarachnoid blood on T1WI (T1-FLAIR mismatch). RESULTS The incidence of warning headache before SAH was 11.0% (14 of 127 patients, determined by interview). The incidence of T1-FLAIR mismatch (neuroradiologic diagnosis of minor leak before major SAH) was 33.9% (43 of 127 patients). Of the 14 patients with warning headache, 13 had a minor leak diagnosed by T1-FLAIR mismatch at the time of admission. Variables identified by multivariate analysis as significantly associated with minor leak diagnosed by T1-FLAIR mismatch included 80 years of age or older, rebleeding after admission, intracerebral hemorrhage on CT, and mRS scores of 3-6. CONCLUSIONS We conclude that warning headaches diagnosed by interview are not a product of recall bias but are the result of actual leaks from aneurysms.
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Goh SK, Tompsett DA, Saines PJ, Chang HC, Matsumoto T, Imai M, Yoshimura K, Grosche FM. Ambient pressure structural quantum critical point in the phase diagram of (Ca(x)Sr(1-x))(3)Rh(4)Sn(13). PHYSICAL REVIEW LETTERS 2015; 114:097002. [PMID: 25793843 DOI: 10.1103/physrevlett.114.097002] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/21/2014] [Indexed: 06/04/2023]
Abstract
The quasiskutterudite superconductor Sr_{3}Rh_{4}Sn_{13} features a pronounced anomaly in electrical resistivity at T^{*}∼138 K. We show that the anomaly is caused by a second-order structural transition, which can be tuned to 0 K by applying physical pressure and chemical pressure via the substitution of Ca for Sr. A broad superconducting dome is centered around the structural quantum critical point. Detailed analysis of the tuning parameter dependence of T^{*} as well as insights from lattice dynamics calculations strongly support the existence of a structural quantum critical point at ambient pressure when the fraction of Ca is 0.9 (i.e., x_{c}=0.9). This establishes the (Ca_{x}Sr_{1-x})_{3}Rh_{4}Sn_{13} series as an important system for exploring the physics of structural quantum criticality without the need of applying high pressures.
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Herfst S, Imai M, Kawaoka Y, Fouchier RAM. Avian influenza virus transmission to mammals. Curr Top Microbiol Immunol 2014; 385:137-55. [PMID: 25048542 DOI: 10.1007/82_2014_387] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Influenza A viruses cause yearly epidemics and occasional pandemics. In addition, zoonotic influenza A viruses sporadically infect humans and may cause severe respiratory disease and fatalities. Fortunately, most of these viruses do not have the ability to be efficiently spread among humans via aerosols or respiratory droplets (airborne transmission) and to subsequently cause a pandemic. However, adaptation of these zoonotic viruses to humans by mutation or reassortment with human influenza A viruses may result in airborne transmissible viruses with pandemic potential. Although our knowledge of factors that affect mammalian adaptation and transmissibility of influenza viruses is still limited, we are beginning to understand some of the biological traits that drive airborne transmission of influenza viruses among mammals. Increased understanding of the determinants and mechanisms of airborne transmission may aid in assessing the risks posed by avian influenza viruses to human health, and preparedness for such risks. This chapter summarizes recent discoveries on the genetic and phenotypic traits required for avian influenza viruses to become airborne transmissible between mammals.
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Sei Y, Mizuno M, Imai M, Suzuki Y, Higashide K, Okada N, Harris C, Matsuo S, Ito Y. Expression of membrane complement regulators in patients on peritoneal dialysis therapy. Mol Immunol 2013. [DOI: 10.1016/j.molimm.2013.05.110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Murakami Y, Masuda T, Imai M, Iwami J, Nakamura H, Noguchi T, Yoshimura F. Analysis of Major Virulence Factors inPorphyromonas gingivalisunder Various Culture Temperatures Using Specific Antibodies. Microbiol Immunol 2013; 48:561-9. [PMID: 15322335 DOI: 10.1111/j.1348-0421.2004.tb03552.x] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Porphyromonas gingivalis is implicated in the occurrence of adult periodontitis. We have previously identified major outer membrane proteins from P. gingivalis, which include representative virulence factors such as gingipains, a 75 kDa major protein, RagA, RagB, and putative porin. Fimbriae, another important virulence factor, exist on the cell surface. In this study, we identified major supernatant proteins. They were fimbrilin, the 75 kDa major protein, gingipains and their adhesin domains. Microscopic examination showed that supernatant proteins formed vesicle-like and fimbrial structures. To learn more about the character of this bacterium, we examined effects of growth temperature on localization and expression of these virulence factors. In general, localization of major virulence factors did not change at the various growth temperatures used. Most of the 75 kDa major protein, RagA, RagB, and putative porin were found in the envelope fraction, not in cell-free culture supernatant. Gingipains were found in both the envelope fraction and supernatant. More than 80% of fimbriae were associated with cells, less than 20% migrated to the supernatant. Most fimbriae existed in the whole cell lysate, although there was a small amount in the envelope fraction. When the growth temperature was increased, expression of fimbriae, gingipains, the 75 kDa major protein, RagA, and RagB decreased. However, temperature had almost no effect on expression of putative porin. The tendency for expression of major virulence factors to decrease at higher temperatures may enable P. gingivalis to survive under hostile conditions.
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Higami H, Shiomi H, Tazaki J, Imai M, Saito N, Kimura T. Five-year outcomes and late adverse events after sirolimus-eluting stent implantation for unprotected left main coronary artery disease. Eur Heart J 2013. [DOI: 10.1093/eurheartj/eht310.p5529] [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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Imai M, Kimura TK. Characteristics of angiographic Peri-Stent contrast Staining (PSS) on very late stent thrombosis after sirolimus-eluting stent implantation: morphological classification and antiplatelet therapy. Eur Heart J 2013. [DOI: 10.1093/eurheartj/eht310.p4811] [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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Vass A, Süveges G, Érces D, Nógrády M, Varga G, Földesi I, Futakuchi M, Imai M, Okada N, Okada H, Boros M, Kaszaki J. Inflammatory activation after experimental cardiac tamponade. Eur Surg Res 2013; 51:1-13. [PMID: 23859935 DOI: 10.1159/000352089] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2013] [Accepted: 05/14/2013] [Indexed: 11/19/2022]
Abstract
BACKGROUND/PURPOSE Cardiac tamponade is a medical emergency situation associated with a high rate of life-threatening complications, even after immediate interventions. Our aim was to characterize the acute inflammatory consequences of this event in a clinically relevant large animal model. METHODS Cardiac tamponade was induced for 60 min in anesthetized, ventilated and thoracotomized minipigs by intrapericardial fluid administration, the mean arterial pressure (MAP) being maintained in the interval of 40-45 mm Hg (n = 8). A further group (n = 7) served as sham-operated control. The global macrohemodynamics, including the right- and left-heart end-diastolic volumes (RHEDV and LHEDV), the pulmonary vascular resistance index (PVRI) and the superior mesenteric artery (SMA) flow, were monitored for 240 min, and the intestinal microcirculatory changes (pCO2 gap) were evaluated by indirect tonometry. Blood samples were taken for the determination of cardiac troponin T and vasoactive inflammatory mediators, including histamine, nitrite/nitrate, big-endothelin, superoxide and high-mobility group box protein-1 levels in association with intestinal leukocyte and complement activation. RESULTS The cardiac tamponade induced significant decreases in MAP, cardiac output, LHEDV and SMA flow, while the PVRI and the pCO2 gap increased significantly. After the removal of fluid from the pericardial sac, the MAP and the LHEDV were decreased, while the PVRI and the pCO2 gap remained elevated when compared with those in the sham-operated group. In the posttamponade period, the abrupt release of inflammatory mediators was accompanied by a significant splanchnic leukocyte accumulation and complement activation. CONCLUSIONS The macrocirculatory and splanchnic microcirculatory disturbances were accompanied by a significant proinflammatory reaction; endothelin and the complement system may be significant components of the inflammatory cascade that is activated in this porcine model of pericardial tamponade.
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Imai M, Iriki Y, Itoh A. Target Dependence of Single-Electron-Capture Cross Sections for Slow Be, B, C, Fe, Ni, and W Ions Colliding with Atomic and Molecular Targets. FUSION SCIENCE AND TECHNOLOGY 2013. [DOI: 10.13182/fst13-a16447] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Komiya T, Sato K, Shioya H, Inagaki Y, Hagiya H, Kozaki R, Imai M, Takada Y, Maeda T, Kurata H, Kurono M, Suzuki R, Otsuki K, Habashita H, Nakade S. Efficacy and immunomodulatory actions of ONO-4641, a novel selective agonist for sphingosine 1-phosphate receptors 1 and 5, in preclinical models of multiple sclerosis. Clin Exp Immunol 2013. [PMID: 23199323 DOI: 10.1111/j.1365-2249.2012.04669.x] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
ONO-4641 is a next-generation sphingosine 1-phosphate (S1P) receptor agonist selective for S1P receptors 1 and 5. The objective of the study was to characterize the immunomodulatory effects of ONO-4641 using preclinical data. ONO-4641 was tested in both in-vitro pharmacological studies as well as in-vivo models of transient or relapsing-remitting experimental autoimmune encephalomyelitis (EAE). In vitro, ONO-4641 showed highly potent agonistic activities versus S1P receptors 1 and 5 [half maximal effective concentration (EC(50) ) values of 0·0273 and 0·334 nM, respectively], and had profound S1P receptor 1 down-regulating effects on the cell membrane. ONO-4641 decreased peripheral blood lymphocyte counts in rats by inhibiting lymphocyte egress from secondary lymphoid tissues. In a rat experimental autoimmune encephalomyelitis (EAE) model, ONO-4641 suppressed the onset of disease and inhibited lymphocyte infiltration into the spinal cord in a dose-dependent manner at doses of 0·03 and 0·1 mg/kg. Furthermore, ONO-4641 prevented relapse of disease in a non-obese diabetic mouse model of relapsing-remitting EAE. These observations suggest that ONO-4641 may provide therapeutic benefits in the treatment of multiple sclerosis.
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Katakami N, Atagi S, Yoshioka H, Fukuoka M, Ogiwara A, Imai M, Ueda M, Matsui S. Nested Case Control Study of Proteomic Biomarkers for Interstitial Lung Disease in Japanese Patients With Non-Small Cell Lung Cancer Treated With Erlotinib. Ann Oncol 2012. [DOI: 10.1016/s0923-7534(20)32800-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
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Pehkonen H, Lepikhova T, Louhimo R, Peitsaro N, Imai M, Martinez R, Klefström J, Hautaniemi S, Monni O. 380 Functional Properties of PPFIA1, Located at the 11q13 Amplification Region, in Epithelial Cancer Cells. Eur J Cancer 2012. [DOI: 10.1016/s0959-8049(12)71065-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Kashima K, Imai M. Impact Factors to Regulate Mass Transfer Characteristics of Stable Alginate Membrane Performed Superior Sensitivity on Various Organic Chemicals. ACTA ACUST UNITED AC 2012. [DOI: 10.1016/j.proeng.2012.07.490] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Sakuma Y, Urakami N, Taniguchi T, Imai M. Asymmetric distribution of cone-shaped lipids in a highly curved bilayer revealed by a small angle neutron scattering technique. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2011; 23:284104. [PMID: 21709321 DOI: 10.1088/0953-8984/23/28/284104] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We have investigated the lipid sorting in a binary small unilamellar vesicle (SUV) composed of cone-shaped (1,2-dihexanoyl-sn-glycero-3-phosphocholine: DHPC) and cylinder-shaped (1,2-dipalmitoyl-sn-glycero-3-phosphocholine: DPPC) lipids. In order to reveal the lipid sorting we adopted a contrast matching technique of small angle neutron scattering (SANS), which extracts the distribution of deuterated lipids in the bilayer quantitatively without steric modification of lipids as in fluorescence probe techniques. First the SANS profile of protonated SUVs at a film contrast condition showed that SUVs have a spherical shape with an inner radius of 190 Å and a bilayer thickness of 40 Å. The SANS profile of deuterated SUVs at a contrast matching condition showed a characteristic scattering profile, indicating an asymmetric distribution of cone-shaped lipids in the bilayer. The characteristic profile was described well by a spherical bilayer model. The fitting revealed that most DHPC molecules are localized in the outer leaflet. Thus the shape of the lipid is strongly coupled with the membrane curvature. We compared the obtained asymmetric distribution of the cone-shaped lipids in the bilayer with the theoretical prediction based on the curvature energy model.
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Naoe K, Yoshimoto S, Naito N, Kawagoe M, Imai M. Preparation of protein nanoparticles using AOT reverse micelles. Biochem Eng J 2011. [DOI: 10.1016/j.bej.2011.02.015] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Kimata M, Terashima T, Kurita N, Satsukawa H, Harada A, Kodama K, Sato A, Imai M, Kihou K, Lee CH, Kito H, Eisaki H, Iyo A, Saito T, Fukazawa H, Kohori Y, Harima H, Uji S. Quasi-two-dimensional Fermi surfaces and coherent interlayer transport in KFe₂As₂. PHYSICAL REVIEW LETTERS 2010; 105:246403. [PMID: 21231539 DOI: 10.1103/physrevlett.105.246403] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/02/2010] [Indexed: 05/30/2023]
Abstract
We report the results of the angular-dependent magnetoresistance oscillations (AMROs), which can determine the shape of bulk Fermi surfaces (FSs) in quasi-two-dimensional (Q2D) systems, in a highly hole-doped Fe-based superconductor KFe2As2 with Tc ≈ 3.7 K. From the AMROs, we determined the two Q2D FSs with rounded-square cross sections, correspond to 12% and 17% of the first Brillouin zone. The rounded-squared shape of the FS cross section is also confirmed by the analyses of the interlayer transport under in-plane fields. From the obtained FS shape, we infer the character of the 3d orbitals that contribute to the FSs.
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Anyiwo CE, Imai M, Igo JD, Ogunbanjo B, Iwamoto A, Babona DV. Genotyping of human immunodefiency virus isolates in Papua New Guinea. NIGERIAN QUARTERLY JOURNAL OF HOSPITAL MEDICINE 2010; 20:181-185. [PMID: 21913525] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
BACKGROUND There has been considerable escalation in the incidence of HIV infection in Papua New Guinea since the first cases have been reported in 1987. OBJECTIVES The study was to identify the genetic subtype in HIV infected patients in Papua New Guinea. It is believed that the result will not only assist in tracing and tracking the sources of the infection, but will also help to evaluate the impact of the genotypes on the natural history of HIV in Papua New Guinea. METHODS Plasma samples from eighty patients were definitively tested for HIV antibodies at PNG Central Public Health Laboratory using Welcome ELISA, Serodia, Immuno Comb and Hexagon. The samples were also tested for Hepatitis B (HBsAG and HBcAG) and Hepatitis C virus antibodies. The HIV positive samples were reconfirmed by the Western Blot analysis; RNA isolation and reverse transcription. DNA sequencing and phylogenetic analysis and determination of HIV subtypes were determined by using representative sequences A-H, J, N and 0 in the Los Alamos Database. RESULTS The total number of HIV-1 positive patients' samples was 20 (5 females and 15 males) Out of this, 11 (all males) were successfully subtyped as c (91%) and b (9%) showing the predominant type to be subtype C. Nine isolates were designated not typable. This is attributable to either low viral load or new emerging strains that could not be detected by the database used in phylogenetic analysis. CONCLUSION Data predicts that there is possible emergence of BC circulating recombinant form (CRF) because we also identified subtype B. We suggest that as subtype C remains a guide for tracking the sources of infection in PNG that both subtypes C and B (and any other subtypes that may be identified in future) be included in the future vaccine for use in Papua New Guinea since some potential vaccines work only against particular subtypes assuming that nearly all subtypes identified so far are responsive to ant-retroviral drugs.
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Ito M, Miyado K, Nakagawa K, Muraki M, Imai M, Yamakawa N, Qin J, Hosoi Y, Saito H, Takahashi Y. Age-associated changes in the subcellular localization of phosphorylated p38 MAPK in human granulosa cells. Mol Hum Reprod 2010; 16:928-37. [DOI: 10.1093/molehr/gaq076] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
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Ramachandran S, Komura S, Imai M, Seki K. Drag coefficient of a liquid domain in a two-dimensional membrane. THE EUROPEAN PHYSICAL JOURNAL. E, SOFT MATTER 2010; 31:303-310. [PMID: 20306216 DOI: 10.1140/epje/i2010-10577-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/08/2009] [Revised: 01/28/2010] [Accepted: 02/19/2010] [Indexed: 05/29/2023]
Abstract
Using a hydrodynamic theory that incorporates a momentum decay mechanism, we calculate the drag coefficient of a circular liquid domain of finite viscosity moving in a two-dimensional membrane. We derive an analytical expression for the drag coefficient which covers the whole range of domain sizes. Several limiting expressions are discussed. The obtained drag coefficient decreases as the domain viscosity becomes smaller with respect to the outer membrane viscosity. This is because the flow induced in the domain acts to transport the fluid in the surrounding matrix more efficiently.
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Imai M. [Brief history of launching Clinical and Experimental Nephrology]. NIHON JINZO GAKKAI SHI 2010; 52:30-33. [PMID: 20166537] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
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Tsuchiya K, Imai M, Yoshida M, Tateishi H, Nitatori T. CMR2009: 8.02: Perfusion CT of brain tumors can be performed with 25 ml of contrast material using 64-detector CT. CONTRAST MEDIA & MOLECULAR IMAGING 2009. [DOI: 10.1002/cmmi.337] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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