7201
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Inbar Y, Chen Y, Hadar Y. THE USE OF COMPOSTED SLURRY PRODUCED BY METHANOGENIC FERMENTATION OF COW MANURE AS A GROWTH MEDIA. ACTA ACUST UNITED AC 1985. [DOI: 10.17660/actahortic.1985.172.6] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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7202
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Liao Z, Haimovitz A, Chen Y, Chan J, Rosenstreich DL. Characterization of a human interleukin 1 inhibitor. THE JOURNAL OF IMMUNOLOGY 1985. [DOI: 10.4049/jimmunol.134.6.3882] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Abstract
Human urine contains a specific inhibitor of interleukin 1 (IL 1) that is found in increased amounts during fever. This inhibitor was purified by using a sequence of ammonium sulfate fractionation, DEAE cellulose ion-exchange chromatography, molecular sieve chromatography on Sephacryl S-200, affinity chromatography on concanavalin A (Con A) Sepharose, and polyacrylamide gel electrophoresis. Two peaks of IL 1 inhibitory material were eluted from the polyacrylamide gels. One peak contained three proteins of 29, 32, and 67 kd, respectively, which could be visualized by silver staining. The second peak contained only a small amount of the 67 kd protein. A partially purified inhibitor fraction was found to cross-react with antisera directed against two low m.w. urine trypsin inhibitors that are cleavage products of the serum inter-alpha-trypsin inhibitor. Although these findings suggest that the urine IL 1 inhibitor may be related to the inter-alpha-trypsin inhibitor, a more exact identification will require either a homogeneous inhibitor preparation or a monospecific antiserum.
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7203
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Chen Y, Fu C, Ho K, Harmon BN. Calculations for the transverse N-point phonons in bcc Zr, Nb, and Mo. PHYSICAL REVIEW. B, CONDENSED MATTER 1985; 31:6775-6778. [PMID: 9935560 DOI: 10.1103/physrevb.31.6775] [Citation(s) in RCA: 31] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
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7204
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Stassis C, Smith GS, Harmon BN, Ho K, Chen Y. Lattice dynamics of the metastable fcc phase of lanthanum. PHYSICAL REVIEW. B, CONDENSED MATTER 1985; 31:6298-6304. [PMID: 9935504 DOI: 10.1103/physrevb.31.6298] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
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7205
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Abstract
Theoretical free-energy coupling systems in which the free energy coupling intermediate (e.g., the proton) occurs only in small numbers of molecules per coupling unit are shown to exhibit a number of peculiar properties: (i) the reactions involving the intermediates do not follow conventional kinetic (or nonequilibrium thermodynamic) rate laws in terms of the average concentration or chemical potential of the intermediate, (ii) the variation of the output reaction rate with the average intermediate concentration (or apparent chemical potential) is not unequivocal but depends on whether the input reaction or the leak is varied to alter that concentration, and (iii) when the apparent free energy contained in the average concentration of the intermediate is compared with the average free energy recovered in the output reaction, apparent violations of the second law of thermodynamics can occur. These phenomena are reminiscent of experimental observations in proton-linked free-energy transducing systems that suggest a more direct coupling between electron transfer chains and H+-ATPases than only through a bulk proton gradient, delta muH. Consequently, the chemiosmotic coupling theory can account for those observations if it limits the number of free energy coupling protons per chemiosmotic coupling unit to small values.
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7206
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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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7207
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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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7208
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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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7209
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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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7210
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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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7211
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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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7212
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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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7213
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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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7214
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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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7215
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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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7216
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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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7217
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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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7218
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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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7219
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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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7220
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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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7221
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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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7222
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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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7223
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7224
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Zhang XZ, Zhou FX, Chen Y. [X-ray study on congenital gonadal dysgenesis (Turner's syndrome)]. ZHONGGUO YI XUE KE XUE YUAN XUE BAO. ACTA ACADEMIAE MEDICINAE SINICAE 1983; 5:43-6. [PMID: 6226385] [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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7225
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Gonzalez R, Abraham MM, Boatner LA, Chen Y. The correlation of hydrogen diffusion with the relative concentrations of cubic and axial Fe3+ sites in KTaO3. J Chem Phys 1983. [DOI: 10.1063/1.444808] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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7226
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Chen Y, Zheng Z, Hu B, Zhang H, Yang L, Ye W. Study on hereditary variations induced by silkworm DNA--mutagenecity of Attacus cynthia ricini by B. mori DNA. SCIENTIA SINICA. SERIES B, CHEMICAL, BIOLOGICAL, AGRICULTURAL, MEDICAL & EARTH SCIENCES 1982; 25:141-51. [PMID: 7100894] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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7227
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Chen Y, Hwang LT, Heller P. Immunosuppression in plasmacytoma: induction of suppressor cells. Clin Exp Immunol 1982; 47:191-6. [PMID: 6212173 PMCID: PMC1536353] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
Immunosuppression in BALB/c mice with plasmacytomas (PC) is, at least in part, due to increased suppressor activity of splenic adherent cells. A PC subcellular fraction rich in intracisternal A particles, previously shown to have an immunosuppressive effect in normal BALB/c mice, is now shown to exert this effect through the development of splenic suppressor cells. The splenic suppressor cells induced with this subcellular fraction were found to be radioresistant adherent macrophages that suppressed the immune response of normal splenic cells to sheep erythrocytes through a diffusible factor, but did not influence their polyclonal IgM secretion ater LPS stimulation in vitro. These characteristics are identical to those of the naturally occurring suppressor macrophages in mice with PC. Whether the induction of suppressor cells is due to the intracisternal A particles themselves or a factor co-purified with them, remains to be established.
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7228
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Chen Y, Heller P. The mode of action of splenic suppressor cells in murine plasmacytoma. Clin Exp Immunol 1981; 45:514-22. [PMID: 6461449 PMCID: PMC1537407] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
Abstract
Polyclonal IgM secretion after LPS stimulation and antigen-dependent antibody production by splenic cells of BALB/c mice with plasmacytoma were found to be markedly reduced. The former occurred without mediation of suppressor cells, probably as the result of a quantitative reduction of mitogen-responsive B lymphocytes. On the other hand, the reduction in the generation of antibodies to sheep erythrocytes in vitro, as determined by the number of PFC, was found to be dependent on the activity of suppressor cells which had the functional characteristics of macrophages. The targets of these suppressor cells were found to be normal macrophages, B and T lymphocytes which were all independently suppressed. A diffusible factor appeared to be responsible for the suppressive effect of the suppressor macrophages interfering mainly with those early stages of the immune response involving antigen-triggered B cell activation.
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7229
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Chen Y. [Pharmacological studies of Cinnamomum cassia bark. Part I. Effects on the blood and cardiovascular system (author's transl)]. ZHONG YAO TONG BAO (BEIJING, CHINA : 1981) 1981; 6:32-4. [PMID: 6210452] [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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7230
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Hou XD, Chen Y. Amaurotic family idiocy in china. Chin Med J (Engl) 1981; 94:477-82. [PMID: 6791888] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
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7231
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Thompson J, Sekula S, Chen Y. Magnetic properties of Ni in MgO; Ni+2 ions and magnetically ordered precipitates. ACTA ACUST UNITED AC 1981. [DOI: 10.1016/0378-4363(81)90350-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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7232
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Zhang Z, Chen Y. On the relationship between the population structure and national economic development in China. SOCIAL SCIENCES IN CHINA 1981; 2:55-83. [PMID: 12312519] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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7233
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Tang ZJ, Lao AN, Chen Y, Zhang XX, Wang CG, Zhong FD. [Studies on the active principles fo neuromuscular blocking actions of Cyclea barbata (Wall.) Miers (author's transl)]. YAO XUE XUE BAO = ACTA PHARMACEUTICA SINICA 1980; 15:506-8. [PMID: 7211396] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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7234
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Barash PG, Chen Y, Kitahata LM, Kopriva CJ. The hemodynamic tracking system: a method of data management and guide for cardiovascular therapy. Anesth Analg 1980; 59:169-74. [PMID: 7189345] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
In the operating room or intensive care unit, multiple measurements of circulatory function are almost mandatory in patients with significant cardiovascular disease. Use in these areas requires that the information must be easily organized, rapidly obtained, and inexpensive. A hemodynamic tracking system that meets these criteria is described. This system incorporates a hand-held programmable calculator (cost = $210 to $300) to derive variables computed from standard cardiovascular measurements. The time required to obtain a set of measurements (including thermodilution cardiac output determinations in duplicate), key the numbers into the calculator, and obtain the derived indices is 4 minutes. Two patients, who had acute mitral insufficiency and whose clinical management differed substantially are presented to illustrate the use of data obtained from the hemodynamic tracking system.
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7235
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Abstract
We recently presented, in a qualitative manner, a cross-bridge model of muscle contraction which was based on a biochemical kinetic cycle for the actomyosin ATPase activity. This cross-bridge model consisted of two cross-bridge states detached from actin and two cross-bridge states attached to actin. In the present paper, we attempt to fit this model quantitatively to both biochemical and physiological data. We find that the resulting complete cross-bridge model is able to account reasonably well for both the isometric transient data observed when a muscle is subjected to a sudden change in length and for the relationship between the velocity of muscle contraction in vivo and the actomyosin ATPase activity in vitro. This model also illustrates the interrelationship between biochemical and physiological data necessary for the development of a complete cross-bridge model of muscle contraction.
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7236
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Chen Y. On the admittance of membranes associated with channel conduction. Application to channels at non-equilibrium steady state. J Theor Biol 1979; 81:633-44. [PMID: 537392 DOI: 10.1016/0022-5193(79)90274-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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7237
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Abraham MM, Chen Y, Peters WC, Rubio O. J, Unruh WP. ENDOR of F+ centers in SrO. J Chem Phys 1979. [DOI: 10.1063/1.438809] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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7238
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Yang S, Chen J, Chen Y. [Determination of curcumol in the volatile oil of Curcuma aromatica (author's transl)]. YAO XUE XUE BAO = ACTA PHARMACEUTICA SINICA 1979; 14:356-61. [PMID: 517132] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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7239
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Rubio O. J, Muñoz P. E, Boldú O. J, Chen Y, Abraham MM. EPR powder pattern analysis for Mn2+ in cubic crystalline fields. J Chem Phys 1979. [DOI: 10.1063/1.437542] [Citation(s) in RCA: 33] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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7240
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Chen Y. Noise analysis and channel properties. Ann N Y Acad Sci 1977; 303:382-8. [PMID: 290304] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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7241
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Conrad GW, Hart GW, Chen Y. Differences in vitro between fibroblast-like cells from cornea, heart, and skin of embryonic chicks. J Cell Sci 1977; 26:119-37. [PMID: 411797 DOI: 10.1242/jcs.26.1.119] [Citation(s) in RCA: 33] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Populations of fibroblast-like cells of corneal stroma, heart ventricle, and back skin of day-14 embryonic chicks were grown in vitro as primary and secondary cultures and were found to differ from one another by several criteria. Such cells were obtained from tissues either directly (cornea) by dissection or indirectly (heart and skin) by the rapid adhesion of the fibroblast-like cells to glass and plastic substrata. Individual fibroblast-like cells of cornea and heart were distinguishable from one another during their first 24–48 h in vitro. The morphologies of the individual cels of these 2 populations became indistinguishable during logarithmic growth, although each could be distinguished from individual fibroblast-like cells of skin. When the cultures reached saturation, corneal cells formed a monolayer of randomly oriented polygonal cells; skin cells formed a monolayer of long, narrow, ragged cells in parallel arrays with occasional double-layering; and heart cells formed multilayers of criss-crossed cells whose broad, smooth outlines were in parallel array in each layer. Saturation densities of the 3 fibroblast-like populations were different: heart greater than skin greater than cornea. By 3 methods of assay the cells were found to be differentially sensitive to treatment with trypsin and EDTA, and to EDTA alone, heart cells consistently being the least sensitive. Taken together, these data suggest that fibroblast-like cell populations isolated from different tissues of a single organism are different from one another and thus may behave differently from one another during in vitro studies.
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7242
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Hsu CC, Chen Y, Patterson R. Peripheral blood B-lymphocyte abnormalities associated with hyperthyroidism of Graves' disease. Clin Exp Immunol 1976; 26:431-40. [PMID: 64326 PMCID: PMC1540954] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Proportions of peripheral blood thymus-derived T lymphocytes (T cells) and bone-marrow-derived B-lymphocytes (B cells) were studied in twelve hyperthyroid patients and ninety-nine non-hyperthyroid control subjects including thirty-nine healthy individuals and sixty patients with various disorders. All hyperthyroid patients had Graves' disease and eight were untreated. The sheep erythrocyte (E)-rosetting technique was employed for enumeration of T cells and the immunofluorescent technique was used for identification of lymphocytes with surface immunoglobulins (SIg), a marker for B cells. The results showed that hyperthyroid patients had higher percentages of lymphocytes stainable for SIg, whereas their T-cell proportions were the same as our control values. In addition, approximately half or more of the fluorescein stainable lymphocytes reacted with each of the five antisera against individual heavy chain determinants, including the epsilon chain, indicating the presence of more than three Ig determinants on the same cell. The fluorescein-stainable cells did not form E rosettes. Blocking of the Fc receptor on lymphocytes by incubating the patients' cells with heat-aggregated human IgG or heated goat anti-bovine serum albumin (anti-BSA) failed to abolish the subsequent fluorescent staining of the cells. Incubation of patients' lymphocytes with non-fluorescent anti-epsilon inhibited the subsequent staining of cells with fluoresceinated anti-epsilon but not staining with fluoresceinated anti-mu or anti-gamma. Thus, the study revealed B-cell abnormalities associated with hyperthyroidism, manifested by the simultaneous presence of multiple Ig classes, including IgE, on a single B cell. Results of studies of incubation of the patients' plasmas with lymphocytes from health individuals and studies of SIg by overnight culture of the patients' lymphocytes with or without prior trypsinization suggested that the SIg was generated endogenously by the cell on which it resided.
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7243
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Rubio J, Chen Y, Abraham MM. Tetravalent manganese in lithium‐doped MgO and CaO. J Chem Phys 1976. [DOI: 10.1063/1.432039] [Citation(s) in RCA: 11] [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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7244
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Bhoopalam N, Chen Y, Yakulis V, Heller P. Surface immunoglobulins of lymphocytes in plasmacytoma. V. The effect of RNA-rich extract from mouse plasmacytoma MOPC 104E on the immune response. Clin Exp Immunol 1976; 24:357-67. [PMID: 1277583 PMCID: PMC1538407] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
BALB/c mice with the plasmacytoma MOPC 104E producing monoclonal IgM-lambda with antibody activity to alpha-1,3 dextran were found to have B lymphocytes with surface immunoglobulins with the immunochemical characteristics of 104E IgM capable of binding alpha-1,3 dextran. RNA extracted from this plasmacytoma induced the synthesis of such surface immunoglobulins on normal B lymphocytes in vitro and in vivo. Injection of 200 mug of MOPC 104E RNA into normal mice 72 hr prior to the administration of the antigen kept the immune response to dextran-S intact, but suppressed that to other antigens, such as DNP-Ficoll and LPS, T cell-independent antigens, and SRBC and BSA which are T cell-dependent. The effect of the RNA was abolished by RNase but not by pronase and DNase. RNA extracted from LPC-1 tumour (gamma2a-k without known antibody activity) significantly suppressed the immune response to dextran-S and to other antigens in normal mice. Thus, opposite effects of MOPC 104E RNA on the response to specific and non-specific antigens strengthen the hypothesis that the immune deficiency in plasmacytoma bearing mice is due to the conversion of normal surface immunoglobulin of a population of B lymphocytes to the idiotype of the respective myeloma globulin.
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7245
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Chen Y, Yakulis V, Heller P. Passive immunity to murine plasmacytoma by rabbit antiidiotypic antibody to myeloma protein. PROCEEDINGS OF THE SOCIETY FOR EXPERIMENTAL BIOLOGY AND MEDICINE. SOCIETY FOR EXPERIMENTAL BIOLOGY AND MEDICINE (NEW YORK, N.Y.) 1976; 151:121-5. [PMID: 1250837 DOI: 10.3181/00379727-151-39157] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Antiidiotypic antisera to LPC-1 and MOPC-300 plasmacytoma globulins were produced in rabbits by immunization with the corresponding antigen and exhaustive immunoabsorption with normal BALB/c plasma and other myeloma globulins. IgG fractions of these antisera when given intraperitoneally on three consecutive days after tumor implantation, protected the animal specifically from the grafting of the corresponding plasmacytoma or induced regression of the tumors after their initial grafting and growth. In vitro cytotoxicity of the antisera to plasmacytoma cells was not demonstrated. Plasma of the antisera-treated normal BALB/c mice, though containing antiidiotypic antibody in high titers (320-640), was not cytotoxic to tumor cells. The inhibitory effect on tumor growth can be considered the result of passive immunization against plasmacytoma with xenogeneic humoral antibody.
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7246
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Chen Y, Bhoopalam N, Yakulis V, Heller P. Changes in lymphocyte surface immunoglobulins in myeloma and the effect of an RNA-containing plasma factor. Ann Intern Med 1975; 83:625-31. [PMID: 812401 DOI: 10.7326/0003-4819-83-5-625] [Citation(s) in RCA: 45] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
Patients with multiple myeloma have a reduced number of B lymphocytes with normal surface immunoglobulin. When, however, anti-idiotypic antiserums to the respective myeloma globulins were used for the visualization of surface immunoglobulin by indirect immunofluorescence, a large number of surface immunoglobulin carrying lymphocytes were detected. The possibility of absorption of these monoclonal surface immunoglobulins from the surrounding plasma was excluded by showing their resynthesis after removal from the cells by trypsinization. The change in the character of surface immunoglobulin was reproduced on normal lymphocytes with an RNA-rich extract from the plasma of patients with myeloma; this effect was inhibited by RNase and cycloheximide. These findings suggest the possibility that an RNA-containing plasma factor transmits information for synthesis of surface immunoglobulins between myeloma cells and normal lymphocytes. This mechanism may contribute to the dysfunction of B lymphocytes in patients with myeloma, leading to immunologic deficiency.
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7247
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Abstract
Myxedema ileus uncommonly complicates the hypothyroid state. It is a rare cause of intestinal pseudo-obstruction that can be reversed with thyroid hormone therapy. Our two patients with myxedema ileus had concurrent infection. Intestinal ileus was completely reversed with the administration of thyroid hormone.
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7248
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Chen Y. Phenomenological coefficients and general proof of reciprocal relation for a certain class of sliding filament models of muscle contraction. J Theor Biol 1975; 51:419-28. [PMID: 1142795 DOI: 10.1016/0022-5193(75)90071-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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7249
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Chen Y, Briese FW, Reeve EB. Relation of fibrinogen secretion (synthesis) to ACTH dose. THE AMERICAN JOURNAL OF PHYSIOLOGY 1974; 227:932-9. [PMID: 4372896 DOI: 10.1152/ajplegacy.1974.227.4.932] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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7250
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Chen Y, Reeve EB. ACTH stimulation of fibrinogen biosynthesis. THE AMERICAN JOURNAL OF PHYSIOLOGY 1974; 227:940-5. [PMID: 4372897 DOI: 10.1152/ajplegacy.1974.227.4.940] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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