576
|
Oh S, Choi S. Wigner-function approach to a single-electron tunnel junction. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:4440-4443. [PMID: 9986391 DOI: 10.1103/physrevb.54.4440] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
577
|
Lee DH, Chung J, Oh S. X-ray photoelectron-diffraction analysis of oxygen chemisorption on the GaAs(110) surface. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 53:13038-13046. [PMID: 9982982 DOI: 10.1103/physrevb.53.13038] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
578
|
Kim HS, Jang CG, Park WK, Oh KW, Rheu HM, Cho DH, Oh S. Blockade by ginseng total saponin of methamphetamine-induced hyperactivity and conditioned place preference in mice. GENERAL PHARMACOLOGY 1996; 27:199-204. [PMID: 8919631 DOI: 10.1016/0306-3623(95)02023-3] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Ginseng total saponin (GTS) inhibited methamphetamine-induced hyperactivity and conditioned place preference (CPP). Dopamine (DA) receptor supersensitivity was developed in methamphetamine-induced CPP mice and it was inhibited by GTS. GTS also inhibited apomorphine-induced climbing behavior, showing the antidopaminergic activity of GTS. These results suggest that GTS inhibition of the methamphetamine-induced hyperactivity and CPP may be closely related with the inhibition of dopaminergic activation induced by methamphetamine.
Collapse
|
579
|
Park KH, Oh S, Shimada K, Kamata A, Ono K, Kakizaki A, Ishii T. 3s photoemission spectra of Fe/Cu(100) films. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 53:5633-5639. [PMID: 9984172 DOI: 10.1103/physrevb.53.5633] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
580
|
Utsunomiya I, Ito M, Watanabe K, Tsurufuji S, Matsushima K, Oh S. Infiltration of neutrophils by intrapleural injection of tumour necrosis factor, interleukin-1, and interleukin-8 in rats, and its modification by actinomycin D. Br J Pharmacol 1996; 117:611-4. [PMID: 8646404 PMCID: PMC1909350 DOI: 10.1111/j.1476-5381.1996.tb15234.x] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
1. To assess in vivo chemotactic activity of tumour necrosis factor (TNF), interleukin-1 (IL-1), IL-8, and cytokine-induced neutrophil chemoattractant (CINC), we injected these cytokines into the pleural cavity of rats. 2. CINC (0.1-1 microgram) and recombinant human IL-8 (rhIL-8, 0.2-5 micrograms) caused neutrophil infiltration into the rat pleural cavity in a dose-dependent fashion, peaking at 3 h. The number of leukocytes in the peripheral blood did not change significantly. 3. RhTNF alpha and rhIL-1 alpha also induced neutrophil accumulation. The dose response curves of rhTNF alpha (0.67 ng-6.7 micrograms) and rhIL-1 alpha (0.45 ng-4.5 micrograms) at 3 h were bell shaped. On the other hand, unlike CINC and rhIL-8, rhTNF alpha and rhIL-1 alpha caused transient marked leukopenia at 3 h in a simple dose-dependent fashion. 4. Concomitant injection of actinomycin D dose-dependently and completely at 10 micrograms inhibited neutrophil infiltration induced by rhTNF alpha (0.67 microgram) and rhIL-1 alpha (0.45 microgram) at 3 h. However, that induced by CINC or rhIL-8 was not affected by actinomycin D. 5. Peaking at 1 h, CINC production in the pleural cavity was found after intrapleural injection of rhTNF alpha (0.67 microgram) or rhIL-1 alpha (0.45 microgram), but not after that of rhIL-8 (5 micrograms). The CINC production induced by rhTNF alpha or rhIL-1 alpha and the neutrophil infiltration was suppressed by concomitant injection of actinomycin D (1 and 10 micrograms). 6. These results indicate that CINC and IL-8 themselves are direct chemoattractants for neutrophils, whereas TNF and IL-1 induce neutrophil infiltration indirectly via newly synthesized mRNA for chemotactic protein including CINC, which may be involved in neutrophil emigration at local inflammatory sites in rats.
Collapse
|
581
|
Oh S, McCaslin PP. Kainate produces concentration-dependent elevation of glutamate release but not cGMP levels in cultured neuron. GENERAL PHARMACOLOGY 1996; 27:83-7. [PMID: 8742499 DOI: 10.1016/0306-3623(95)00079-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
1. Treatment of cultured cerebellar granule cells for 3 min with N-methyl-D-aspartate (NMDA) resulted in a concentration-dependent elevation of cyclic GMP. However, neither kainate (KA) nor NMDA produced a concentration-dependent elevation of this nucleotide after exposing cells to the agonist for 60 min. 2. Unlike the case for cGMP, both KA and NMDA produced concentration-dependent elevations of glutamate for 60 min incubation. 3. The NMDA-induced elevations of cGMP and glutamate were blocked by selective NMDA receptor antagonists. 4. The selective KA/alpha-amino-3-hydroxy-5-methylisoxazole-4-propionate (AMPA) receptor antagonist, 6,7-nitroquinoxaline-2,3-dione (DNQX), blocked the KA-induced elevations of cGMP with 3-min exposures, but it augmented the response with 60-min exposures. However, the KA-induced release of glutamate was prevented by DNQX. 5. The KA/AMPA receptor antagonist, GYKI 52466, blocked all KA-induced responses regardless of the incubation times.
Collapse
|
582
|
Kim HS, Park WK, Jang CG, Oh S. Inhibition by MK-801 of cocaine-induced sensitization, conditioned place preference, and dopamine-receptor supersensitivity in mice. Brain Res Bull 1996; 40:201-7. [PMID: 8736582 DOI: 10.1016/0361-9230(96)00006-8] [Citation(s) in RCA: 61] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Repeated administration of cocaine led to increases in ambulation-accelerating activity (sensitization) and conditioned place preference (CPP). Dopamine (DA)-receptor supersensitivity was also developed in cocaine-induced sensitized and CPP mice. An N-methyl-D-aspartate (NMDA)-receptor antagonist, MK-801, blocked simultaneously developments of cocaine-induced behavioral sensitization, CPP, and DA-receptor supersensitivity. Furthermore, MK-801 inhibited a apomorphine-induced striatal dopaminergic action: climbing behavior. These results suggest that the cocaine-induced dopaminergic behaviors such as sensitization to ambulatory activity and CPP may be produced via activation of the NMDA receptor. The development of postsynaptic DA-receptor supersensitivity may be an underlying common mechanism that mediates cocaine-induced behavioral sensitization and CPP.
Collapse
|
583
|
Nahm TU, Park KH, Oh S, Chung S, Wertheim GK. Partial spectral weights of disordered Cu-Au alloys. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 52:16466-16475. [PMID: 9981045 DOI: 10.1103/physrevb.52.16466] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
584
|
Cho EJ, Lee S, Oh S, Han M, Lee YS, Whang CN. Unoccupied states and charge transfer in Cu-Pd alloys studied by bremsstrahlung isochromat spectroscopy, x-ray photoelectron spectroscopy, and LIII absorption spectroscopy. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 52:16443-16450. [PMID: 9981043 DOI: 10.1103/physrevb.52.16443] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
585
|
Oh S, Rheem S, Sim J, Kim S, Baek Y. Optimizing conditions for the growth of Lactobacillus casei YIT 9018 in tryptone-yeast extract-glucose medium by using response surface methodology. Appl Environ Microbiol 1995; 61:3809-14. [PMID: 8526490 PMCID: PMC167683 DOI: 10.1128/aem.61.11.3809-3814.1995] [Citation(s) in RCA: 92] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
This study was undertaken to find optimum conditions of tryptone, yeast extract, glucose, Tween 80, and incubation temperature for the growth of Lactobacillus casei YIT 9018 and to assess the effects of these factors by use of response surface methodology. A central composite design was used as an experimental design for allocation of treatment combinations. A second-order polynomial regression model, which was used at first for analysis of the experiment, had a significant lack of fit. Therefore, cubic and quartic terms were incorporated into the regression model through variable selection procedures. Effects involving incubation temperature, yeast extract, glucose, and tryptone were significant, whereas the only significant effect involving Tween 80 was the interaction effect between temperature and Tween 80. It turned out that growth of L. casei YIT 9018 was most strongly affected by the incubation temperature. Estimated optimum conditions of the factors for growth of L. casei YIT 9018 are as follows: tryptone, 3.04%; yeast extract, 0.892%; glucose, 1.58%; Tween 80, 0%; incubation temperature, 35 degrees C.
Collapse
|
586
|
Ryu JY, Kang YB, Oh S, Suzuki A, Choi SD. Hot-electron magnetophonon resonance of quantum wells in tilted magnetic fields. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 52:11089-11095. [PMID: 9980206 DOI: 10.1103/physrevb.52.11089] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
587
|
Abeyama K, Oh S, Kawano K, Nakajima T, Soejima Y, Nakano K, Maruyama I. Nonionic contrast agents produce thrombotic effect by inducing adhesion of leukocytes on human endothelium. Biochem Biophys Res Commun 1995; 212:776-83. [PMID: 7542889 DOI: 10.1006/bbrc.1995.2036] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
The expression of P-selectin was more upregulated following the exposure to nonionic low osmolar contrast agents than to ionic contrast agents. Exposure to nonionic contrast agents led to a marked adhesion of leukocytes to endothelial cells. Thrombomodulin activity of endothelial cells was decreased, and plasminogen activator inhibitor-1 (PAI-1) and tumor necrosis factor (TNF) alpha in the supernatant were increased when leukocyte adhesion occurred after exposure to nonionic contrast agents. Results suggest that the adhesion of leukocytes to the endothelium increases procoagulant activity.
Collapse
|
588
|
Oh S, McCaslin PP. The iron component of sodium nitroprusside blocks NMDA-induced glutamate accumulation and intracellular Ca2+ elevation. Neurochem Res 1995; 20:779-84. [PMID: 7477670 DOI: 10.1007/bf00969689] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
These studies were designed to compare the effects of nitric oxide (NO) generating compounds with those of several iron containing compounds which do not generate NO on glutamate receptor function. Stimulation of primary cultures of cerebellar granule cells with N-methyl-D-aspartate (NMDA) or kainate results in the elevation of intracellular calcium ([Ca2+]i) and cGMP and the release of glutamate. The iron containing compounds, sodium nitroprusside (SNP), potassium ferrocyanide (K4Fe(CN)6) and potassium ferricyanide (K3Fe(CN)6) decrease the NMDA-induced release of glutamate. SNP is the only compound of the above 3 agents which generates NO. A non-iron, NO generating compound, S-nitroso-N-acetylpenicillamin (SNAP), has no effect on the NMDA-induced glutamate release. Potassium ferrocyanide (Fe II), but not potassium ferricyanide (Fe III), blocks NMDA-induced cGMP elevations after 3 min exposure times. This contrasts with the NO generating compounds (both SNP and SNAP) which elevate cGMP levels. Furthermore, both potassium ferrocyanide (Fe II) and SNP (Fe II) suppress the elevation of [Ca2+]i induced by NMDA but neither potassium ferricyanide (Fe III) nor SNAP are effective in this regard. These effects are also independent of cyanide as another Fe II compound, ferrous sulfate (FeSO4) is also able to suppress NMDA-induced elevations of [Ca2+]i. SNP was unable to suppress kainate receptor functions. Collectively, these results indicate that Fe II, independently of NO, has effects on NMDA receptor function.
Collapse
|
589
|
Abstract
The N-methyl-D-aspartate (NMDA) receptor plays a key role in synaptic plasticity and is thought to underlie memory, learning and development of the nervous system. The NMDA receptor is a ligand-gated ion channel complex that contains distinct recognition sites for endogenous and exogenous ligands, including glutamate, glycine, Mg2+, Zn2+ and noncompetitive blockers such as MK-801. In the central nervous system, nitric oxide (NO) is produced in some neurons following activation of excitatory amino acids receptors, particularly those of the NMDA receptor. Nitric oxide is synthesized from a L-arginine by the cytoplasmic enzyme nitric oxide synthase (NOS) which is a calcium dependent enzyme, and this pathway is inhibited by the analogues of L-arginine such as NG-monomethyl-L-arginine (L-NMMA) and is augmented by NMDA receptor activation. Activation of the NMDA receptor results in the elevation of intracellular calcium ([Ca2+]i) which in turn activates NOS via the calcium-calmodulin complex. Nitric oxide is not a classical neurotransmitter in the central nervous system since it is not released by exocytosis and does not interact with a receptor protein but rather diffuses rapidly across the membrane and binds with the iron in heme-containing proteins. Nitric oxide can serve as both an oxidizing and reducing agent. It has strong affinity for heme proteins such as guanylyl cyclase, but there is evident that NO may have a regulatory role by oxidizing sulfhydryl groups of non-heme proteins such as those on the NMDA receptor.(ABSTRACT TRUNCATED AT 250 WORDS)
Collapse
|
590
|
Oh S, Ryu CM. Persistent spin currents induced by the Aharonov-Casher effect in mesoscopic rings. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 51:13441-13448. [PMID: 9978148 DOI: 10.1103/physrevb.51.13441] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
591
|
Johnston JB, Dalal BI, Israels SJ, Oh S, McMillan E, Begleiter A, Michaud G, Israels LG, Greenberg AH. Deposition of transforming growth factor-beta in the marrow in myelofibrosis, and the intracellular localization and secretion of TGF-beta by leukemic cells. Am J Clin Pathol 1995; 103:574-82. [PMID: 7741102 DOI: 10.1093/ajcp/103.5.574] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
The marrows of 10 patients with hematologic malignancies were examined by immunohistochemistry using anti TGF-beta antibody, CC(1-30), which detects secreted TGF-beta, and compared with four normal marrows. TGF-beta was not demonstrated in marrows with a normal level of reticulin fibrosis; however, TGF-beta was observed within collagen in marrows having collagen fibrosis or increased reticulin fibrosis. The extent of TGF-beta deposition paralleled the severity of fibrosis (P < .0001), and occurred even with normal or reduced numbers of megakaryocytes. Using another TGF-beta antibody, LC(1-30), which detects intracellular TGF-beta, TGF-beta was detected by immunofluorescence in discrete sites in the cytoplasm of immature and mature myeloid and large granular lymphocytic leukemia cells. These sites colocalized with areas detected by an anti-granule antibody (D545) suggesting that TGF-beta was stored in granules. However, neither the TGF-beta mRNA content nor the degree of TGF-beta secretion by these leukemic cells correlated with the extent of TGF-beta deposition in the marrow. Thus, TGF-beta deposition in marrow may contribute to myelofibrosis, but the source of this cytokine in the absence of megakaryocytes requires further study.
Collapse
|
592
|
Reed R, Marks R, Oh S. Similarities of error regularization, sigmoid gain scaling, target smoothing, and training with jitter. ACTA ACUST UNITED AC 1995; 6:529-38. [DOI: 10.1109/72.377960] [Citation(s) in RCA: 74] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
593
|
Cho EJ, Oh S, Imada S, Suga S, Suzuki T, Kasuya T. Origin of the high-binding-energy structure in the 3d core-level spectra of divalent Eu compounds. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 51:10146-10149. [PMID: 9977689 DOI: 10.1103/physrevb.51.10146] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
594
|
Nahm TU, Han M, Oh S, Park J, Allen JW, Chung S. Partial spectral weights of disordered CuxPd1-x alloys including the photoemission matrix-element effect. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 51:8140-8151. [PMID: 9977423 DOI: 10.1103/physrevb.51.8140] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
595
|
Deshpande NG, He XG, Oh S. Amplitude zeros in radiative decays of scalar particles. PHYSICAL REVIEW. D, PARTICLES AND FIELDS 1995; 51:2295-2301. [PMID: 10018700 DOI: 10.1103/physrevd.51.2295] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
|
596
|
Gotoh H, Tagawa H, Oh S, Suzuki K. [A case of endometrial cancer detected at 2 years after childbirth]. NIHON SANKA FUJINKA GAKKAI ZASSHI 1995; 47:67-70. [PMID: 7844456] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
|
597
|
Oh S, Ryu CM. Equivalence between Aharonov-Bohm and Aharonov-Casher effects, and motive forces. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1994; 50:5320-5323. [PMID: 9911534 DOI: 10.1103/physreva.50.5320] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
|
598
|
Yamashita H, Sato Y, Kizaki T, Oh S, Nagasawa J, Ohno H. Basic fibroblast growth factor (bFGF) contributes to the enlargement of brown adipose tissue during cold acclimation. Pflugers Arch 1994; 428:352-6. [PMID: 7816557 DOI: 10.1007/bf00724518] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
The contribution of basic fibroblast growth factor to brown adipose tissue (BAT) enlargement during cold acclimation was investigated using rat brown adipocytes in primary culture. After cold exposure (at 5 degrees C) for 28 days, the level of bFGF messenger ribonucleic acid (mRNA) in BAT of cold-acclimated rats was markedly increased with the increase in the BAT weight. In addition, the blood plasma from cold-acclimated rats considerably enhanced the expression of basic fibroblast growth factor mRNA in rat brown adipocytes. Likewise, the blood plasma from cold-acclimated rats significantly stimulated the growth of rat brown adipocyte precursor cells compared with that from warm-acclimated rats, whereas there was no difference of effect between the two blood plasmas on the growth of bovine capillary endothelial cells. Basic fibroblast growth factor, but not platelet-derived growth factor stimulated the growth of brown adipocyte precursor cells. The conditioned medium from brown adipocyte primary culture markedly stimulated the growth of bovine capillary endothelial cells and the effect was inhibited considerably by antibasic fibroblast growth factor antibody. These results suggest that some factors concerned with the growth of brown adipocyte precursor cells are present in the blood plasma from cold-acclimated rats, and that basic fibroblast growth factor produced by brown adipocytes may significantly contribute to BAT enlargement by autocrine mechanisms during cold exposure.
Collapse
|
599
|
Oh S, Kleinberger M, McElhaney JH. Finite-element analysis of balloon angioplasty. Med Biol Eng Comput 1994; 32:S108-14. [PMID: 7967823 DOI: 10.1007/bf02523336] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Finite-element modelling is used to simulate the response of atherosclerotic arteries to a balloon angioplasty procedure. Material properties for the normal wall are derived from experimental data, and the properties of the plaque are varied over a wide range. Comparison with experimental data shows that the normal arterial wall can be appropriately modelled using a hyperelastic material definition. Large strain, non-linear analysis was used to simulate the dilatation of three typical plaque configurations by an angioplasty balloon. Stress contour plots are presented for each configuration. Results show good agreement with previous histologic studies.
Collapse
|
600
|
Tjeng LH, Oh S, Chen CT, Allen JW, Cox DL. Tjeng et al. reply. PHYSICAL REVIEW LETTERS 1994; 72:4154. [PMID: 10056396 DOI: 10.1103/physrevlett.72.4154] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
|