7526
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Tsai N, Chen Y. Acute infectious torticollis in the United States. Neurology 1985. [DOI: 10.1212/wnl.35.5.774-b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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7527
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Song TS, Chen Y, Chen J, Yan HQ, Xia ZY, Cai N, Xia YF. [Effects of some psychotropic drugs on the osmotic stability and membrane expansion of human erythrocyte membrane]. ZHONGGUO YAO LI XUE BAO = ACTA PHARMACOLOGICA SINICA 1985; 6:19-24. [PMID: 2859732] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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7528
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Zhang XZ, Zhou FX, Chen Y. X-ray study on congenital gonadal dysgenesis (Turner's syndrome). Chin Med J (Engl) 1985; 98:165-70. [PMID: 3924507] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
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7529
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Banin A, Margulies L, Chen Y. Iron-montmorillonite: a spectral analog of Martian soil. JOURNAL OF GEOPHYSICAL RESEARCH 1985; 90 Suppl Pt 2:C771-4. [PMID: 11542022 DOI: 10.1029/jb090is02p0c771] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Light absorption and reflectance by smectite clays containing various adsorbed ions were measured in the UV, VIS, and NIR ranges and compared to Martian dust and surface soil spectra. Structural iron in the octahedral sheet of smectites is responsible for a characteristic absorption feature in the UV at 240-260 nm, resulting from an O2 --> Fe3+ charge transfer that is similar to one observed in the Martian spectrum. Adsorbed iron affects, via crystal field absorptions, the reflectance of montmorillonite in the VIS and NIR (to 1.3 micrometers), causing stronger absorption and higher opacity in the wavelength range 0.4-0.6 micrometer, without developing any specific pronounced absorption feature. In both general appearance and presence of, or lack of, spectral features, the iron-montmorillonite reflectance spectra in the VIS and NIR are similar to the Martian spectra. At present, however, spectral similarity cannot be used as the sole criterion for constraining Martian mineralogy since several other minerals, other than Fe-smectites, show sufficient similitude to the Martian spectra; other properties have to be explored and combined to obtain a definitive identification.
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7530
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Liu CL, Chen YY. [Steroidal sapogenins from mildewed Dioscorea collettii Hook. f]. YAO XUE XUE BAO = ACTA PHARMACEUTICA SINICA 1985; 20:143-5. [PMID: 4036620] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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7531
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Liu ZS, Yan RH, Chen YY. [A decompression procedure for vertebral artery insufficiency in cervical spondylosis]. ZHONGHUA WAI KE ZA ZHI [CHINESE JOURNAL OF SURGERY] 1984; 22:711-3, 780. [PMID: 6543750] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/05/2023]
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7532
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Shi WX, Chen Y, Jin GZ. [Effect of l-stepholidine on rotational behavior in rats]. ZHONGGUO YAO LI XUE BAO = ACTA PHARMACOLOGICA SINICA 1984; 5:222-5. [PMID: 6242210] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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7533
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Zhou M, Chen Y. [Glutathione peroxidase--an antioxidative enzyme]. SHENG LI KE XUE JIN ZHAN [PROGRESS IN PHYSIOLOGY] 1984; 15:348-351. [PMID: 6544521] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
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7534
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Liu CL, Chen YY. [Studies on the constituents from Dioscorea plants. X. Isolation and identification of steroidal saponins and sapogenins from Dioscorea althaeoides Kunth]. YAO XUE XUE BAO = ACTA PHARMACEUTICA SINICA 1984; 19:799-801. [PMID: 6544035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/05/2023]
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7535
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Abstract
Examination of Monte Carlo kinetic simulations, based on a realistic set of microscopic rate constants that apply to the end of a microtubule with a GTP cap, suggests that the end of a microtubule alternates between two quasimacroscopic phases. In one phase, the microtubule end has a GTP cap that fluctuates in size; in the other phase, the GTP cap has been lost. These repeated phase changes take place at any given tubulin concentration in a wide range of concentrations. While in the first phase, the microtubule grows slowly; while in the second phase, it shortens rapidly and may disappear completely. These results are closely related to the recent experimental work of Mitchison and Kirschner [Mitchison, T. & Kirschner, M.W. (1984) Nature (London), in press].
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7536
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Chen YY. [9 cases of myxedema heart]. ZHONGHUA XIN XUE GUAN BING ZA ZHI 1984; 12:201-3. [PMID: 6532765] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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7537
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Zheng YF, Chen MQ, Chen Y, Zhang BZ. [Effect of excitation of the peripheral ends of the abdominal vagus on the release of spleen catecholamines in cats]. ZHONGGUO YI XUE KE XUE YUAN XUE BAO. ACTA ACADEMIAE MEDICINAE SINICAE 1984; 6:206-9. [PMID: 6241050] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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7538
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Chen Y, Inbar Y, Raviv M, Dovrat A. THE USE OF SLURRY PRODUCED BY METHANOGENIC FERMENTATION OF COW MANURE AS A PEAT SUBSTITUTE IN HORTICULTURE - PHYSICAL AND CHEMICAL CHARACTERISTICS. ACTA ACUST UNITED AC 1984. [DOI: 10.17660/actahortic.1984.150.58] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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7539
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Carlier MF, Hill TL, Chen Y. Interference of GTP hydrolysis in the mechanism of microtubule assembly: an experimental study. Proc Natl Acad Sci U S A 1984; 81:771-5. [PMID: 6583675 PMCID: PMC344918 DOI: 10.1073/pnas.81.3.771] [Citation(s) in RCA: 130] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
Abstract
This paper reports an experimental study of the interference of GTP hydrolysis in the mechanism of microtubule assembly, following the model and theory previously published [Hill, T. L. & Carlier, M.-F. (1983) Proc. Natl. Acad. Sci. USA 80, 7234-7238]. Results from dilution experiments show that microtubules depolymerize faster below the critical concentration than expected with a reversible polymerization model. The experimental plot of flux versus tubulin concentration exhibits a slope discontinuity at the critical concentration, in agreement with the theory. Theoretical points calculated by the Monte Carlo method can be fitted qualitatively to the data. A consequence of this peculiar dynamic behavior of microtubules is that the ratio of tubulin dissociation and association rate constants measured, respectively, below and above the critical concentration does not yield the true value of the critical concentration. It is emphasized that the presence of GTP at microtubule ends is necessary to maintain the stability of the polymer.
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7540
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Chen YY. [Experimental study on the deleterious effect of silk suture in gastrointestinal anastomosis]. ZHONGHUA WAI KE ZA ZHI [CHINESE JOURNAL OF SURGERY] 1984; 22:84-6. [PMID: 6380988] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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7541
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Chen Y. [Cytogenetic study on Turner's syndrome]. ZHONGHUA FU CHAN KE ZA ZHI 1984; 19:18-22. [PMID: 6430656] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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7542
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Chen Y, Sun CG, Sun GT, Li Y. [The dormancy types and characteristics of the seeds of medicinal plants]. YAO XUE XUE BAO = ACTA PHARMACEUTICA SINICA 1984; 19:69-75. [PMID: 6464770] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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7543
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Boldú JL, Muñoz P. E, Chen Y, Abraham MM. EPR power pattern analysis for cubic sites of Fe3+ in MgO. J Chem Phys 1984. [DOI: 10.1063/1.446437] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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7544
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Chen YY, Pelletier G. Demonstration of contacts between proopiomelanocortin neurons in the rat hypothalamus. Neurosci Lett 1983; 43:271-6. [PMID: 6324045 DOI: 10.1016/0304-3940(83)90200-8] [Citation(s) in RCA: 29] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
The relationships between proopiocortin neurons have been studied in the rat hypothalamic arcuate nucleus by immunocytochemistry. At the light microscopic level, contacts between immunostained endings and cell bodies or dendrites were frequently observed. At the electron microscopic level, stained nerve terminals were seen making symmetrical synaptic contacts with labeled dendrites and cell bodies. These observations are the first indication that neurons producing the same peptides can have contacts between themselves. This provides morphological evidence for autoregulation of neuropeptide systems.
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7545
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Chen Y, Hill TL. Use of Monte Carlo calculations in the study of microtubule subunit kinetics. Proc Natl Acad Sci U S A 1983; 80:7520-3. [PMID: 6584870 PMCID: PMC389983 DOI: 10.1073/pnas.80.24.7520] [Citation(s) in RCA: 36] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
Abstract
GTP-tubulin forms a cap on microtubule ends during aggregation. The bulk of the microtubule is GDP-tubulin. This complicates the usual simple kinetic theory of subunit exchange at microtubule ends to such an extent that Monte Carlo calculations are needed to handle the complications, except in special cases. The Monte Carlo method is introduced here, for this problem, and illustrated with steady-state and transient examples. Monte Carlo transients are needed to simulate dilution experiments. Preliminary results (with M. F. Carlier) have been obtained applying these theoretical procedures to experimental data.
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7546
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Joly JR, Chen YY, Ramsay D. Serogrouping and subtyping of Legionella pneumophila with monoclonal antibodies. J Clin Microbiol 1983; 18:1040-6. [PMID: 6358248 PMCID: PMC272837 DOI: 10.1128/jcm.18.5.1040-1046.1983] [Citation(s) in RCA: 52] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
Monoclonal antibodies directed against Legionella pneumophila serogroups 1 to 6 were produced by fusing splenocytes of BALB/c mice with the Sp 2/0-Ag14 or the NSO mouse myeloma cell lines. Specificity of these antibodies was determined by indirect fluorescent-antibody staining: 8 reacted with L. pneumophila serogroup 1 and, respectively, 13, 6, 6, 5, and 10 reacted with serogroups 2, 3, 4, 5, and 6; all except 5 were serogroup specific, and none presented cross-reactions with six other species of Legionellaceae. Serogroup determination of 35 isolates of L. pneumophila with seven selected monoclonal antibodies resulted in correct serogrouping in all instances; a pool of the same seven monoclonal antibodies stained intensely all strains of L. pneumophila without any staining of the other species of Legionellaceae. When 24 serogroup 1 isolates of L. pneumophila were stained with eight serogroup 1-specific monoclonal antibodies, the staining patterns could be clustered in five distinct groups. These hybridomas thus represent an unlimited source of standard reagent that could be used in the detection and serogrouping of L. pneumophila; differences in staining patterns could be used as epidemiological markers for these bacteria.
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7547
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Chen Y. [Physiological and pathological research in microcirculation in hyperbaric medicine]. SHENG LI KE XUE JIN ZHAN [PROGRESS IN PHYSIOLOGY] 1983; 14:359-361. [PMID: 6678491] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
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7548
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Abstract
Acute torticollis has occurred in epidemics in eastern and northern China since 1975, but has not yet been reported in other countries. A general account of this disease, including its terminology, epidemiology, clinical features, laboratory findings, diagnosis, differential diagnosis, and treatment, is presented. The etiology, though highly suggestive of a virus infection, remains to be determined.
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7549
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Liu CL, Chen YY, Ge SB, Li BG. [Studies on the constituents of Dioscorea plants. II. Isolation and identification of steroidal saponins from Dioscorea collettii Hook. F]. YAO XUE XUE BAO = ACTA PHARMACEUTICA SINICA 1983; 18:597-606. [PMID: 6677041] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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7550
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Chen Y, Zeeck A, Chen Z, Zähner H. Metabolic products of microorganisms. 222. beta-Oxotryptamine derivatives isolated from Streptomyces ramulosus. J Antibiot (Tokyo) 1983; 36:913-5. [PMID: 6885642 DOI: 10.7164/antibiotics.36.913] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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