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Gulley GL, Tao R. Static shear stress of electrorheological fluids. Phys Rev E Stat Phys Plasmas Fluids Relat Interdiscip Topics 1993; 48:2744-2751. [PMID: 9960907 DOI: 10.1103/physreve.48.2744] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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153
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Zhang P, Tang YZ, Hao YB, Tao R. [Effects of methylflavonolamine on TXA2 and PGI2 plasma levels in rabbits with myocardial infarction]. Zhongguo Yao Li Xue Bao 1993; 14:266-8. [PMID: 8237408] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Effects of methylflavonolamine (MFA) on TXA2 and PGI2 plasma levels in rabbits of myocardial infarction were investigated. It was found that TXB2 levels were inhibited by MFA 2.5 or 5.0 mg.kg-1 i.v. while 6-keto-PGF1 alpha levels were only slightly inhibited after repeated doses of 5.0 mg.kg-1 i.v. within 6 h. This result indicates that MFA exhibit stronger inhibition on cyclo-oxygenase in platelets than in endothelial cells. In addition, the myocardial injury and the size of myocardial infarction were much less in the MFA treated groups than in the control.
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Affiliation(s)
- P Zhang
- Department of Pharmacology, Shanxi Medical College, Taiyuan, China
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Tao R. Electric-field-induced phase transition in electrorheological fluids. Phys Rev E Stat Phys Plasmas Fluids Relat Interdiscip Topics 1993; 47:423-426. [PMID: 9960018 DOI: 10.1103/physreve.47.423] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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157
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Abstract
The effect of systemic morphine on extracellular serotonin (5-HT) in the diencephalon of unanesthetized, unrestrained rats was investigated by in vivo microdialysis coupled to high performance liquid chromatography with electrochemical detection. Administration of morphine resulted in a dose dependent increase in extracellular 5-HT. Significant increases were first seen at a dose of 5 mg/kg, and a maximal increase occurred at 10 mg/kg. This increase was blocked by pretreatment with naltrexone, indicating that the effect of morphine on 5-HT was mediated by opiate receptors. Morphine also had a significant effect on extracellular 5-hydroxyindoleacetic acid (5-HIAA), leading to a gradual increase across a range of doses. The effect of morphine on 5-HT was compared to effects of morphine on nociception and catalepsy. Increases in 5-HT and 5-HIAA were first detected at doses that were analgesic but too low to elicit catalepsy. Consistent with many reports that opioids cause an increase in synthesis and turnover of 5-HT in the rat forebrain, the present results provide more direct evidence that 5-HT release is increased after morphine administration.
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Affiliation(s)
- S M Grauer
- Department of Biological Sciences, Rutgers University, Piscataway, NJ 08855
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158
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Lin Z, Tao R. Phase transition in aperiodic quantum Ising chains constructed with arbitrary substitution rules. Phys Rev B Condens Matter 1992; 46:10808-10811. [PMID: 10002939 DOI: 10.1103/physrevb.46.10808] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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159
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Abstract
The present study summarizes the results of an in vitro and in vivo comparison of the apparent 5-hydroxytryptamine (5-HT), 5-hydroxyindoleacetic acid, and 3,4-dihydroxyphenylacetic acid dialysis performance of three types of membrane frequently used in intracerebral microdialysis experiments. The dialysis fiber types examined were a regenerated cellulose Cuprophan (GF), a proprietary polycarbonate ether (CMA), and a polyacrylonitrile/sodium methallylsulfonate copolymer (HOSPAL). The experiments unexpectedly revealed that the HOSPAL membrane-equipped probes displayed clearly aberrant 5-HT diffusion dynamics compared with GF and CMA probes, demonstrable not only in vitro, but also in in vivo experiments. In vitro, the GF and CMA membrane-equipped probes exhibited maximum relative recovery for 5-HT already in the first 20-min sample, whereas the 5-HT recovery of HOSPAL probes increased in a very slow and protracted manner over a period of a little less than 2 h. The GF and CMA probes further displayed an immediate washout of 5-HT when the probes were subsequently transferred to artificial CSF only-containing medium (no 5-HT), whereas approximately 2 h was required to yield near-total extinction of dialysate 5-HT with the standard HOSPAL probes. In vivo, the rat ventral hippocampal dialysate 5-HT output responses to K+ (100 mM) infusion, to Ca2+ omission, and to systemic 8-hydroxy-2-(di-n-propylamino)tetralin injection were all markedly retarded and blunted when HOSPAL instead of GF membrane-equipped probes were used. However, the 5-hydroxyindoleacetic acid and 3,4-dihydroxyphenylacetic acid extraction in vitro and in vivo were comparable using either of the membrane types.(ABSTRACT TRUNCATED AT 250 WORDS)
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Affiliation(s)
- R Tao
- Department of Pharmacology, University of Göteborg, Sweden
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Jones T, Tao R. Glutamine content of whole proteins: implications for enteral formulas. Nutr Clin Pract 1992; 7:197-8. [PMID: 1294889 DOI: 10.1177/0115426592007004197] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
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161
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Chen T, Zitter RN, Tao R. Laser diffraction determination of the crystalline structure of an electrorheological fluid. Phys Rev Lett 1992; 68:2555-2558. [PMID: 10045427 DOI: 10.1103/physrevlett.68.2555] [Citation(s) in RCA: 62] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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162
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Lin Z, Wang X, Tao R. Universal scaling function for domain growth in the Glauber-Ising chain. Phys Rev B Condens Matter 1992; 45:8131-8133. [PMID: 10000630 DOI: 10.1103/physrevb.45.8131] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Abstract
The putative existence of a functional alpha 2-adrenoceptor-mediated modulation of 5-HT release in vivo from serotonergic neuronal terminals in the ventral hippocampus was investigated using intracerebral microdialysis in chloral hydrate-anaesthetised rats. The alpha 2-adrenoceptor agonist clonidine (0.01-0.3 mg/kg, SC) dose-dependently decreased the 5-HT output. The response to clonidine was antagonized by systemic or local administration of the alpha 2-adrenoceptor antagonist idazoxan (0.1 mg/kg, SC, or 10 mumol/l, via the dialysis perfusion medium). Similarly, the 5-HT release-suppressing response to the thiazole alpha 2-adrenoceptor agonist jingsongling (0.1 mg/kg, SC) was blocked by idazoxan (0.1 mg/kg, SC). The mixed beta-adrenoceptor/5-HT1 receptor antagonist pindolol (8.0 mg/kg, SC) did not affect the clonidine-induced reduction of 5-HT release. Tyrosine hydroxylase inhibition by means of alpha-methyl-para-tyrosine (alpha-MT; 250 mg/kg, IP) caused a drastic reduction (greater than 80%) in dialysate 3,4-dihydroxyphenyl acetic acid (DOPAC) output but did not affect the 5-HT output per se over 3 h post-injection. Nor did the alpha-MT pretreatment prevent, but instead significantly enhanced, the 5-HT release-suppressing effect of clonidine. The results demonstrate that the release of 5-HT from serotonergic nerve terminals in rat ventral hippocampus in vivo is modulated by alpha 2-adrenoceptors, probably both by heteroreceptors on the axon terminals of the serotonergic neurones and by other alpha 2-adrenoceptor sites situated pre- and/or postsynaptic to the noradrenergic terminals. Our results also suggest that while functionally operative, these sites may receive little physiological tone, at least in chloral hydrate-anaesthetised rats.
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Affiliation(s)
- R Tao
- Department of Pharmacology, University of Göteborg, Sweden
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Abstract
We have compared the ability of the new putatively specific 5-HT1B receptor agonist CP-93,129 (3-(1,2,5,6-tetrahydropyrid-4-yl)pyrrolo[3,2-b] pyrid-5-one) and the structurally related mixed 5-HT1A/5-HT1B receptor ligand RU 24969, to influence 5-HT release in brain in vivo, using microdialysis techniques in chloral hydrate-anaesthetised rats. CP-93,129 (3 or 10 microM, via the dialysis perfusion medium) caused a concentration-dependent and methiothepin (10 microM)-sensitive suppression of ventral hippocampal 5-HT output. The effect of RU 24969 on 5-HT output was dependent on whether or not the 5-HT reuptake blocker citalopram was present in the perfusion medium. Thus, RU 24969 (0.1 microM) induced a decrease, or an increase followed by a decrease (1 microM), in 5-HT output in the absence of citalopram, but monotonically decreased (1 microM) 5-HT release when citalopram (1 microM) was present. CP-93,129 decreased dialysate 5-HT in either condition. Our findings are consistent with the characterisation of CP-93,129 as a 5-HT1B receptor agonist, and may thus represent in vivo support for 5-HT1B autoreceptor-mediated feedback control of 5-HT release in the rat brain. The 5-HT1B selectivity of CP-93,129, and its lack of 5-HT reuptake blocking properties, suggests that the compound compares favourably with other purported 5-HT1B receptor agonists.
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Affiliation(s)
- S Hjorth
- Department of Pharmacology, University of Göteborg, Sweden
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Huang G, Shi ZP, Dai X, Tao R. Soliton excitations in the alternating ferromagnetic Heisenberg chain. Phys Rev B Condens Matter 1991; 43:11197-11206. [PMID: 9996859 DOI: 10.1103/physrevb.43.11197] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Shi ZP, Huang G, Tao R. Envelope-kink excitations in a quantum anisotropic antiferromagnetic Heisenberg chain. Phys Rev B Condens Matter 1991; 43:8583-8586. [PMID: 9996490 DOI: 10.1103/physrevb.43.8583] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Tao R. Critical volume in diffusion through random media. Phys Rev A 1990; 42:994-996. [PMID: 9904116 DOI: 10.1103/physreva.42.994] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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175
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Lin Z, Tao R. Phase transition and scaling properties of the energy spectrum for a hierarchical quantum Ising model. Phys Rev B Condens Matter 1990; 42:648-654. [PMID: 9994584 DOI: 10.1103/physrevb.42.648] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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176
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Shi ZP, Huang G, Tao R. Solitonlike excitations in a spin chain with a biquadratic anisotropic exchange interaction. Phys Rev B Condens Matter 1990; 42:747-753. [PMID: 9994596 DOI: 10.1103/physrevb.42.747] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Huang G, Shi ZP, Dai X, Tao R. Solitonlike phonon localization and two-phonon bound states of multivibrational excitations. Phys Rev B Condens Matter 1990; 41:12292-12294. [PMID: 9993691 DOI: 10.1103/physrevb.41.12292] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Tao R, Chen Z, Sheng P. First-principles Fourier approach for the calculation of the effective dielectric constant of periodic composites. Phys Rev B Condens Matter 1990; 41:2417-2420. [PMID: 9993979 DOI: 10.1103/physrevb.41.2417] [Citation(s) in RCA: 29] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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180
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Tao R, Widom A, Webman I. Multidimensional diffusion in random potentials. Phys Rev A Gen Phys 1989; 39:3748-3750. [PMID: 9901694 DOI: 10.1103/physreva.39.3748] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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181
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Tao R. Comment on "Experimental determination of fractional charge e/q for quasiparticle excitations in the fractional quantum Hall effect". Phys Rev Lett 1988; 61:2972. [PMID: 10039280 DOI: 10.1103/physrevlett.61.2972] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Widom A, Tao R. Coulomb energy and correlations of inversion-layer electrons in metal-oxide-semiconductor field-effect transistor devices. Phys Rev B Condens Matter 1988; 38:10787-10790. [PMID: 9945934 DOI: 10.1103/physrevb.38.10787] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
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Gu GQ, Tao R. New method for evaluating the dc effective conductivities of composites with periodic structure. Phys Rev B Condens Matter 1988; 37:8612-8617. [PMID: 9944221 DOI: 10.1103/physrevb.37.8612] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
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Shinohara T, Dietzschold B, Craft CM, Wistow G, Early JJ, Donoso LA, Horwitz J, Tao R. Primary and secondary structure of bovine retinal S antigen (48-kDa protein). Proc Natl Acad Sci U S A 1987; 84:6975-9. [PMID: 3478675 PMCID: PMC299211 DOI: 10.1073/pnas.84.20.6975] [Citation(s) in RCA: 159] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
The complete amino acid sequence of bovine S antigen (48-kDa protein) has been determined by cDNA and partial amino acid sequencing. A 1623-base-pair (bp) cDNA contains an open reading frame coding for a protein of 404 amino acids (45,275 Da). Tryptic peptides and cyanogen bromide peptides of native bovine S antigen were purified and partially sequenced. All of these peptides were accounted for in the long open reading frame. Searching of the National Biomedical Research Foundation data bank revealed no extensive sequence homology between S antigen and other proteins. However, there are local regions of sequence similarity with alpha transducin, including the sites subject to ADP-ribosylation by Bordetella pertussis and cholera toxins and the phosphoryl binding-sites. Secondary structure prediction and circular dichroic spectroscopy show that S antigen is composed predominantly of beta-sheet conformation. Acid-catalyzed methanolysis suggests the presence of low levels of carbohydrate in the molecule.
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Affiliation(s)
- T Shinohara
- Laboratory of Molecular and Developmental Biology, National Eye Institute, Bethesda, MD 20892
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Tao R, Haldane FD. Impurity effect, degeneracy, and topological invariant in the quantum Hall effect. Phys Rev B Condens Matter 1986; 33:3844-3850. [PMID: 9938799 DOI: 10.1103/physrevb.33.3844] [Citation(s) in RCA: 47] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
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Tao R. Fractional statistics and the quantum Hall effect of two-dimensional fermion and boson systems. Phys Rev B Condens Matter 1986; 33:2937-2940. [PMID: 9938663 DOI: 10.1103/physrevb.33.2937] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
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Sheng P, Tao R. First-principles approach for effective elastic-moduli calculation: Application to continuous fractal structure. Phys Rev B Condens Matter 1985; 31:6131-6133. [PMID: 9936626 DOI: 10.1103/physrevb.31.6131] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
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193
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Barbul A, Wasserkrug HL, Yoshimura N, Tao R, Efron G. High arginine levels in intravenous hyperalimentation abrogate post-traumatic immune suppression. J Surg Res 1984; 36:620-4. [PMID: 6427525 DOI: 10.1016/0022-4804(84)90149-5] [Citation(s) in RCA: 59] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Trauma victims often suffer immune system failure. Oral arginine has strong immune-enhancing properties. The metabolic, hormonal, and immune effects of increasing concentrations of arginine as part of post-trauma intravenous hyperalimentation (IVH) were studied. Groups of 11-14 rats, 275-350 g, underwent jugular vein catheterization and bilateral closed femoral fractures under anesthesia. IVH was started immediately postinjury at a rate of 0.8-1 ml/100 g body wt/hr and continued for 5 days. Twenty percent dextrose and three different amino acid mixtures were given as follows: (A) FreII (1.55 g ARG/1); (B) FreIII (4.05 g ARG/1); (C) modified FreIII (7.9 g ARG/1). All rats lost weight over the 5-day postinjury period; however, rats in groups B and C lost significantly less weight than rats in group A (-3.4 +/- 0.8% of initial body weight and -3.6 +/- 0.9% vs -6.1 +/- 1.2%, P less than 0.05). Rats in group A had negative cumulative nitrogen balance, while those in groups B and C were in highly positive balance. No significant difference in body weight change or nitrogen balance was noted between groups B and C. Trauma-induced thymic involution as assessed by thymic weight and lymphocyte content was greatest in group A, which received the lowest amount of arginine, and was linearly abrogated by increasing the amount of arginine administered (A less than B less than C). Thymocyte immune responsiveness increased with the amount of arginine given as assessed by mitogenesis in response to Con A (stimulation index: A--151.3 +/- 28.8 vs B--243.6 +/- 29.2, P less than 0.01 vs C--321.8 +/- 22.3, P less than 0.001 vs A and P less than 0.02 vs B) and PHA (A--65.0 +/- 14.3 vs B--67.7 +/- 15.3, NS, vs C--117 +/- 14.0, P less than 0.005 vs A and B).(ABSTRACT TRUNCATED AT 250 WORDS)
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Yoshimura N, Tao R, Wolfe A. Protein-sparing effect of intravenously administered branched chain amino acids in adult rats. JPEN J Parenter Enteral Nutr 1978. [DOI: 10.1177/0148607178002004525] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Tao R, Belzile RJ, Brisson GJ, Awad JA. Technique of colostomy in chickens. Am J Vet Res 1969; 30:1067-70. [PMID: 5792784] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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