3051
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Tian Z, Xu J. [Current research on seasonal affective disorder]. ZHONGHUA SHEN JING JING SHEN KE ZA ZHI = CHINESE JOURNAL OF NEUROLOGY AND PSYCHIATRY 1990; 23:117-9. [PMID: 2202563] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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3052
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Xu J, Setser DW. Deactivation rate constants and product branching in collisions of the Xe(6p) states with Kr and Ar. J Chem Phys 1990. [DOI: 10.1063/1.457777] [Citation(s) in RCA: 32] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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3053
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Rowntree P, Scoles G, Xu J. The structure of ammonia overlayers physisorbed onto the surface of single crystal graphite, determined by means of atomic beam diffraction. J Chem Phys 1990. [DOI: 10.1063/1.457842] [Citation(s) in RCA: 20] [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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3054
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Wang C, He J, Xu J. [Relation of changes in plasma TXB2 PGF1alpha and differentiation of signs and symptoms in traditional Chinese medicine in severe icteric hepatitis]. ZHONG XI YI JIE HE ZA ZHI = CHINESE JOURNAL OF MODERN DEVELOPMENTS IN TRADITIONAL MEDICINE 1990; 10:141-3, 130-1. [PMID: 2379294] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Clinical observations and experimental studies were made in 52 cases of chronic cholestatic hepatitis, 30 cases of chronic severe hepatitis, 30 healthy control persons, and 30 animals with experimental intrahepatic cholestasis. The results were as follows: Plasma TXB2 and PGF1 alpha were higher than their normal values both in cases of chronic cholestatic hepatitis and in cases of chronic severe hepatitis (P less than 0.01), the ratio of TXB2 and PGF1 alpha was normal in cases of chronic severe hepatitis and lower than normal value in cases of chronic cholestatic hepatitis (P less than 0.01). The cases were divided into 4 types (hepatitis due to blood stasis and blood heat, blood stasis and blood heat accompanying symptoms of fluid retention in the epigastrium, damp-heat, and composite factors) according to differentiation of symptoms and signs on the basic theories of TCM. Significant difference was found in TXB2, PGF1 alpha, PGF1 alpha/TXB2 and bilirubin when compared with each other in the 4 types of hepatitis patients (P less than 0.01). Bilirubin, TXB2, PGF1 alpha and PGF1 alpha/TXB2 in the survivors became normal or close to normal after they were treated with blood-cooling and circulation-promoting Chinese herbal medicine and prescriptions by changing their dosages according to differentiation of symptoms and signs on the basic theories of TCM. The therapeutic effect of prescription II was more satisfactory than that of prescription I. Changes of plasma TXB2 and PGF1 alpha in the experimental animals were more significant than those both in the control group and in the group treated with prescriptions I and II (P less than 0.01), but in the liver only the ratio of TXB2 and PGF1 alpha was lower than that in normal animals (P less than 0.01).(ABSTRACT TRUNCATED AT 250 WORDS)
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3055
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3056
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He J, Wang C, Xu J. [Relation of changes in plasma cAMP, cGMP and the clinical conditions, pathology and the type of traditional Chinese medicine in 50 cases of chronic severe icteric hepatitis]. ZHONG XI YI JIE HE ZA ZHI = CHINESE JOURNAL OF MODERN DEVELOPMENTS IN TRADITIONAL MEDICINE 1990; 10:75-7, 67. [PMID: 2163773] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Plasma of cAMP and cGMP in 30 cases of chronic active hepatitis (group of cholestatic patients) as well as in 20 cases of chronic hepatitis with submassive or massive necrosis (group of chronic severe hepatitis patients) were studied with 125I-marked radioimmunoassay. 50 cases with their serum bilirubin levels higher than 171 mumol/L were selected as subjects for this study. Among them, 42 were diagnosed as hepatitis B, 6 as coinfection of hepatitis A and B. According to differentiation of symptoms and signs of TCM, 24 were diagnosed as simple hepatitis due to blood stasis and blood heat, 17 as hepatitis due to blood stasis and blood heat accompanying symptoms of Yang deficiency of the Spleen and Kidney. 20 healthy persons were selected as controls. The results were as follows: cAMP was 56.82 +/- 25.54 ng/L and 80.32 +/- 20.73 ng/L, and cGMP was 9.07 +/- 6.56 ng/L and 19.49 +/- 9.34 ng/L in the group of cholestatic patients and in the group of chronic severe hepatitis patients respectively. Both were higher than those in the control group whose cAMP was 14.12 +/- 3.25 ng/L and cGMP was 5.87 +/- 1.44 ng/L (P less than 0.01). Increase in cGMP and decrease in the ratio of cAMP and cGMP in the cases accompanying symptoms of Yang deficiency of the Spleen and Kidney were much higher than those in the other two types of hepatitis patients (P less than 0.01 and 0.05).(ABSTRACT TRUNCATED AT 250 WORDS)
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3057
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Livsey CT, Huang B, Xu J, Karwoski CJ. Light-evoked changes in extracellular calcium concentration in frog retina. Vision Res 1990; 30:853-61. [PMID: 2385926 DOI: 10.1016/0042-6989(90)90054-o] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Light-evoked changes in extracellular Ca2+ concentration were recorded with Ca2(+)-selective microelectrodes in the retina of the frog eyecup. A Ca-decrease at light onset and offset was found in the inner plexiform layer, and its properties are consistent with it resulting from Ca2+ influx into activated neuronal terminals. In the subretinal space, a Ca-increase at light onset and a Ca-decrease at offset were observed, and these likely arise directly from photoreceptors. A slower ON Ca-decrease was also seen here. Because it survives pharmacological isolation of the photoreceptors from post-synaptic interactions, but not physical isolation of the retina from the pigment epithelium, this component probably depends on pigment epithelial activity.
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3058
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Aziz RA, Buck U, Jónsson H, Ruiz‐Suárez J, Schmidt B, Scoles G, Slaman MJ, Xu J. Two‐ and three‐body forces in the interaction of He atoms with Xe overlayers adsorbed on (0001) graphite. J Chem Phys 1989. [DOI: 10.1063/1.457364] [Citation(s) in RCA: 51] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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3059
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Xu J, Feng AL. [Evaluation of calcium and phosphorus nutrition in children in nurseries in Beijing]. ZHONGHUA YI XUE ZA ZHI 1989; 69:512-4. [PMID: 2630029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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3060
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Xu J, Li X. Multidimensional monopole and supermembrane vacua with nontrivial circle bundle. Int J Clin Exp Med 1989; 40:1101-1107. [PMID: 10011917 DOI: 10.1103/physrevd.40.1101] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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3061
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Xu J. [The properties of dentin and resinified dentin in the tensile test]. ZHONGHUA KOU QIANG YI XUE ZA ZHI = ZHONGHUA KOUQIANG YIXUE ZAZHI = CHINESE JOURNAL OF STOMATOLOGY 1989; 24:197-200, 254. [PMID: 2517091] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The purpose of this study is to evaluate the effect of resinifying therapy to the hard tissue of tooth by using measurement of the tensile strength. The fresh extracted maxillary anterior teeth having been cleaned and sterilized were divided into two groups. The control group was placed into 9% N-saline solution of 37 +/- 1 degrees C. The experimental group was treated with resinifying therapy. The tensile specimens were shaped by turning in a lathe until it satisfied the tensile test requirement of Mechanics of Materials except that they were hollow. A set of special split jig was made for this test. Instron Universal Testing Machine was used for measuring the load on the specimens. The loading speed was 0.05 mm/min. The straining meter was used to measure the tensile strain. The result revealed that tensile strength of resinifying dentin was little lower than that of unresinified dentin. The resinified dentin didn't increases stiffness or brittleness.
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3062
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Hsu CY, Liu TH, Xu J, Hogan EL, Chao J, Sun G, Tai HH, Beckman JS, Freeman BA. Arachidonic acid and its metabolites in cerebral ischemia. Ann N Y Acad Sci 1989; 559:282-95. [PMID: 2774402 DOI: 10.1111/j.1749-6632.1989.tb22616.x] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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3063
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Xu J, Tan Q, Du R. Studies of subtypes of group specific component (GC) in six ethnic group of China. GENE GEOGRAPHY : A COMPUTERIZED BULLETIN ON HUMAN GENE FREQUENCIES 1989; 3:27-31. [PMID: 2487054] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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3064
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Abstract
The ability of Xenorhabdus nematophilus 19061/1 to be transformed by pHK17 plasmid DNA was studied and optimized. A number of factors, including culture conditions, stage of growth, transformation buffer pH, cation type and concentration required for the production of competency, washing, heat shock conditions, and cell-DNA ratio, were found to affect transformation significantly. On the basis of these observations, a procedure for the routine transformation of X. nematophilus 19061/1 at frequencies of 1 X 10(5) to 10 X 10(5) transformants per microgram of pHK17 plasmid DNA was developed. Maximum transformation was obtained when cells which had reached the mid- to late-logarithmic growth phase (total counts, 2.5 X 10(8) to 5 X 10(8) cells per ml) within 4.5 to 5.5 h were washed once in cold transformation buffer before they were suspended in the same buffer to 0.1 of their original volume. The highest transformation was obtained when dimethyl sulfoxide was added in two steps to the cells immediately before the DNA was added, after which the cell-DNA mixtures were incubated for 30 min on ice before they were given a 3-min heat shock at 37 degrees C. Following these treatments, the transformed cells were incubated in L broth-60 mM CaCl2 for 1 h before they were plated onto selective medium. We also were able to transform X. nematophilus 19061/1 with plasmid pBR325, and we transformed other species of Xenorhabdus with several common plasmids.
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3065
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Beagley KW, Fujihashi K, Aicher W, Xu J, Kiyono H, Eldridge JH, Bruce MG, Taguchi T, Green DR, Singh B. Mucosal homeostasis: role of interleukins, isotype-specific factors and contrasuppression in the IgA response. Immunol Invest 1989; 18:77-89. [PMID: 2659524 DOI: 10.3109/08820138909112229] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Oral ingestion of antigen elicits immune responses at mucosal sites where humoral immunity is largely due to antibodies of the IgA isotype. This is often accompanied by suppression of systemic responses to the same antigen, a state termed oral tolerance. This IgA response is regulated by interactions between T cell subsets found at IgA inductive tissues, i.e., the gut-associated lymphoreticular tissue (GALT) or Peyer's patches (PP). PP T helper (Th) cells support IgA responses, and interleukins 5 (IL-5) and IL-6 can augment secretion of this isotype. Subsets of Th cells may also express Fc receptors for IgA (Fc alpha R) and secrete Fc alpha R as an IgA-binding factor (IBF alpha). Membrane-derived Fc alpha R is a glycoprotein of 38,000 M.W. and this molecule induces selective increases in IgA secreting cells (as determined by the ELISPOT assay) in PP B cell cultures. Fc alpha R+ T cell lines have been shown to secrete IBF alpha as well as IL-5 both of which promote IgA synthesis. Recombinant IL-5 (rIL-5) and rIL-6 induce IgA synthesis mainly by PP B cell blasts, and principally act on surface IgA-positive (sIgA+) B cells for these responses. Another form of mucosal regulation is provided by T contrasuppressor (Tcs) cells, which abrogate oral tolerance when adoptively transferred to mice and restore systemic responsiveness to the antigen sheep erythrocyte (SRBC). Tcs cells from mice systemically primed with SRBC support IgM and IgG subclass responses, while Tcs cells from orally primed mice support IgM, IgG subclass and IgA anti-SRBC responses. These Tcs cells are CD3+, CD4-, 8- and are antigen-specific. These regulatory cells may use the gamma-delta (gamma-delta) form of T cell receptor for antigen recognition.
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3066
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Xu J, Hardison RC. Localization of the beta-like globin gene cluster and the genes for parathyroid hormone and c-Harvey-ras 1 to region q14----q21 of rabbit chromosome 1 by in situ hybridization. CYTOGENETICS AND CELL GENETICS 1989; 52:157-61. [PMID: 2698321 DOI: 10.1159/000132868] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
The rabbit beta-like globin gene cluster (HBBC), comprised of epsilon-, gamma-, delta-, and beta-globin genes (HBE, HBG, HBD, and HBB, respectively), has been mapped to chromosome 1, region q14----q21, by in situ hybridization using probes for rabbit HBE and HBG. Probes for the human parathyroid hormone gene (PTH) and the Harvey-ras 1 protooncogene (HRAS1) also localize to this region by in situ hybridization. Thus, these genes are syntenic in lagomorphs as well as four other mammalian orders (primates, rodents, carnivores, and artiodactyls). The mapping data in rabbits provide further evidence that this synteny is strongly conserved in the evolution of mammalian chromosomes.
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3067
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Xu J, Shaikh AS, Vest RW. High K BaTiO(3) films from metalloorganic precursors. IEEE TRANSACTIONS ON ULTRASONICS, FERROELECTRICS, AND FREQUENCY CONTROL 1989; 36:307-312. [PMID: 18284983 DOI: 10.1109/58.19168] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Crack-free and dense BaTiO(3) films 4 to 8 mum thick were prepared by spinning a solution of metalloorganic precursors onto an appropriate substrate, and firing and annealing the film in air at certain temperatures to obtain appropriate grain sizes. The electrical properties of the films were studied as a function of grain size, temperature, frequency, and DC bias. Films with a grain size of 0.2 mum showed ferroelectric properties similar to bulk BaTiO(3).
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3068
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Burkhardt CE, Libbert JL, Xu J, Leventhal JJ, Kelley JD. Absolute measurement of photoionization cross sections of excited atoms: Application to determination of atomic beam densities. PHYSICAL REVIEW. A, GENERAL PHYSICS 1988; 38:5949-5952. [PMID: 9900345 DOI: 10.1103/physreva.38.5949] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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3069
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Xu J. [Negative chronotropic effect of adenosine]. SHENG LI KE XUE JIN ZHAN [PROGRESS IN PHYSIOLOGY] 1988; 19:347-51. [PMID: 3074510] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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3070
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Xu J, Wang PX, Lin BL. [Exploration of the relation of kidney deficiency, erythrocyte immune action and complex release activity of complement]. ZHONG XI YI JIE HE ZA ZHI = CHINESE JOURNAL OF MODERN DEVELOPMENTS IN TRADITIONAL MEDICINE 1988; 8:519-20, 515. [PMID: 3248343] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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3071
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Ruiz-Suarez JC, Klein ML, Moller MA, Rowntree PA, Scoles G, Xu J. Structure of physisorbed overlayers of dipolar molecules: A combined study by atomic-beam scattering and molecular dynamics. PHYSICAL REVIEW LETTERS 1988; 61:710-713. [PMID: 10039410 DOI: 10.1103/physrevlett.61.710] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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3072
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Xu J, Rhodes WT. Calculation of effective acoustooptic coefficient by abbreviated subscript formalism. APPLIED OPTICS 1988; 27:2101-2103. [PMID: 20531719 DOI: 10.1364/ao.27.002101] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
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3073
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Huang CB, Li WC, Xu J, Zhang YC. Histochemistry and electron microscopy in the diagnosis of small mucous cells in carcinoma of the stomach. Histopathology 1988; 12:503-15. [PMID: 2456260 DOI: 10.1111/j.1365-2559.1988.tb01970.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
One hundred and two cases of poorly differentiated adenocarcinoma were obtained from 71 surgical and 31 biopsy specimens of the stomach. These tumours produced both intracellular and extracellular mucins, which were demonstrated to be neutral mucins, N-acetyl sialomucins, sulphomucins and O-acetyl sialomucins. The majority of tumours (85.3%) secreted two or more kinds of mucins simultaneously, but only a small proportion (14.7%) produced a single kind of mucin. Ultrastructurally, three types of mucin granules were identified; these differed in shape and density. Tumour cells containing intracellular mucins or mucin granules were designated as mucous cancer cells and further subdivided into small, large and goblet mucous cells; tumour cells having neither mucins nor glandular differentiation were designated as undifferentiated cancer cells. These histochemical distinctions, supported by the electron microscopical observations, may be useful to demonstrate early malignant foci in gastric biopsies.
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3074
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Vest R, Fitzsimmons T, Xu J, Shaikh A, Liedl G, Schindler A, Honig J. Superconducting films prepared using the metallo-organic decomposition technique. J SOLID STATE CHEM 1988. [DOI: 10.1016/0022-4596(88)90081-3] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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3075
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Itokawa H, Xu J, Takeya K, Watanabe K, Shoji J. Studies on chemical constituents of antitumor fraction from Periploca sepium. II. Structures of new pregnane glycosides, periplocosides A, B and C. Chem Pharm Bull (Tokyo) 1988; 36:982-7. [PMID: 3409416 DOI: 10.1248/cpb.36.982] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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3076
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Xu J. [Inhibitory effect of poriatin on murine leukemia 1210 cells]. ZHONGGUO YI XUE KE XUE YUAN XUE BAO. ACTA ACADEMIAE MEDICINAE SINICAE 1988; 10:45-9. [PMID: 2968177] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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3077
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Vest RW, Xu J. PbTiO(3) films from metalloorganic precursors. IEEE TRANSACTIONS ON ULTRASONICS, FERROELECTRICS, AND FREQUENCY CONTROL 1988; 35:711-717. [PMID: 18290207 DOI: 10.1109/58.9327] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Ferroelectric PbTiO(3) films 0.5- to 2.0-mum thick were prepared by the metalloorganic decomposition (MOD) process using multilayer spinning with firing temperatures of 490-630 degrees C. The temperature dependence of the dielectric constant was found to be a function of the c/a ratio, which could be modified by control of either the single-layer thickness or the strength of the electric field during film preparation near the Curie temperature. The films were near theoretical density and defect-free over 2 cmx2 cm areas.
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3078
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Lu D, Xu J, Jiang JY. [Effects of poriatin on mouse peritoneal macrophages]. ZHONGGUO YI XUE KE XUE YUAN XUE BAO. ACTA ACADEMIAE MEDICINAE SINICAE 1987; 9:433-8. [PMID: 2966006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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3079
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Xu J, Oguchi T, Freeman AJ. Solid-solution strengthening: Substitution of V in Ni3Al and structural stability of Ni3(Al,V). PHYSICAL REVIEW. B, CONDENSED MATTER 1987; 36:4186-4189. [PMID: 9943395 DOI: 10.1103/physrevb.36.4186] [Citation(s) in RCA: 50] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
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3080
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Xu J, Chuang DM. Serotonergic, adrenergic and histaminergic receptors coupled to phospholipase C in cultured cerebellar granule cells of rats. Biochem Pharmacol 1987; 36:2353-8. [PMID: 3038121 DOI: 10.1016/0006-2952(87)90603-4] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Phosphatidylinositol (Ptdlns) turnover has been studied in the primary culture of granule cells dissociated from the cerebellum of postnatal rat. Addition of serotonin (5-hydroxytryptamine, 5-HT) caused an increase (300-600% of control) of [3H]inositol monophosphate (IP1) accumulation in the presence of LiCl in cells prelabeled with [3H]myo-inositol. The EC50 and saturation concentrations of 5-HT were about 0.1 and 10 microM respectively. Some nonselective 5-HT receptor agonists, MK212, 5-methoxytryptamine, tryptamine and quipazine, were capable of stimulating IP1 accumulation; a selective 5-HT1A receptor agonist, 8-OH-DPAT, was ineffective. The 5-HT-induced response was potently blocked by several 5-HT2 receptor antagonists such as ketanserin, mianserin, spiroperidol and pyzotyline. The 5-HT-induced accumulation was dependent on the culturing time of granule cells with the maximal response seen in an 8-day culture. Norepinephrine (NE) also promoted an increased IP1 accumulation (300% of the control) with an EC50 of about 1 microM, while prazosin inhibited this NE-induced response with a Ki of about 0.2 nM. The responses induced by NE and 5-HT appeared to be additive. In addition, histamine in a dose-dependent manner enhanced the accumulation by about 100%; this histamine effect was blocked by triprolidine, an H1 receptor antagonist, but not by cimetidine, an H2 receptor antagonist. These results suggest that 5-HT, NE and histamine could be part of the neurotransmitter substances present in mossy fibers or other afferent nerve endings which innervate granule cells in vivo and that Ptdlns turnover regulated by their selective receptors on granule cells may play a role in modulating the excitatory function of these neurons.
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3081
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Xu J, Shur M. Velocity-field characteristics with two maxima in compensated GaAs. PHYSICAL REVIEW. B, CONDENSED MATTER 1987; 36:1352-1354. [PMID: 9942962 DOI: 10.1103/physrevb.36.1352] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
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3082
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Xu J, Chuang DM. Muscarinic acetylcholine receptor-mediated phosphoinositide turnover in cultured cerebellar granule cells: desensitization by receptor agonists. J Pharmacol Exp Ther 1987; 242:238-44. [PMID: 3039110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
Cultured granule cells prepared from 8-day postnatal rats were used for the study of carbachol-induced phosphoinositide turnover. The addition of carbachol induced a 20- to 30-fold increase in [3H]inositol monophosphate (IP1) accumulation within 30 min in the presence of 20 mM LiCl in granule cells prelabeled with [3H]myoinositol. Carbachol also stimulated the formation of [3H]inositol bisphosphate and [3H]inositol trisphosphate assayed either in the presence or in the absence of lithium; the increase in [3H]inositol triphosphate and [3H]inositol biphosphate synthesis appeared to be faster in the time course but much smaller in amount when compared with the formation of [3H]IP1. The EC50 of carbachol was approximately 7 microM, and the saturation concentration was about 100 microM. This carbachol-induced response was completely blocked by two muscarinic acetylcholine receptor (mAChR) antagonists, atropine and pirenzepine, with a Ki of 0.5 and 120 nM, respectively. Saturation studies of the binding of [3H]N-methylscopolamine and [3H]quinuclidinyl benzilate to mAChRs in intact granule cells revealed the presence of a single class of binding sites with a Kd of 140 and 126 pM, respectively, and a Bmax of approximately 70 fmol/10(6) cells for both ligands. Within 1 hr after pre-exposure of cells to carbachol, the subsequent carbachol-induced [3H]IP1 accumulation was reduced by about 50%, whereas mAChR binding, assessed by using either [3H]N-methylscopolamine or [3H]quinuclidinyl benzilate, was unchanged. A second slower phase of desensitization was associated with a loss of mAChR binding sites; at 18 hr, the decrease of responsiveness was about 80%, whereas the loss of mAChR sites was about 60%.(ABSTRACT TRUNCATED AT 250 WORDS)
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3083
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Chen IW, Keating S, Keating C, Wu X, Xu J, Reyes-Morel P, Tien TY. SUPERCONDUCTIVITY AND THE TAILORING OF LATTICE PARAMETERS OF THE COMPOUND YBa2Cu3Ox*. ACTA ACUST UNITED AC 1987. [DOI: 10.1111/j.1551-2916.1987.tb00110.x] [Citation(s) in RCA: 30] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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3084
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Wallace WE, Keane MJ, Hill CA, Xu J, Ong TM. Mutagenicity of diesel exhaust particles and oil shale particles dispersed in lecithin surfactant. JOURNAL OF TOXICOLOGY AND ENVIRONMENTAL HEALTH 1987; 21:163-71. [PMID: 2437315 DOI: 10.1080/15287398709531009] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Diesel exhaust particulate material from exhaust pipe scrapings of two trucks, diluted automobile diesel exhaust particulate material collected on filters, and two oil shale ores were prepared for the Ames mutagenicity assay by dichloromethane (DCM) extraction, by dispersion into 0.85% saline, or by dispersion into dipalmitoyl lecithin (DPL) emulsion in saline. Salmonella typhimurium TA98 was used to detect frameshift mutagens in the samples. Samples of diesel soot gave positive mutagenic responses with both DCM extraction and DPL dispersion, with the DPL dispersion giving higher results in some cases. The results suggest that possible mutagens associated with inhaled particles may be dispersed or solubilized into the phospholipid component of pulmonary surfactant and become active in such a phase.
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3085
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Xu J, Oguchi T, Freeman AJ. Crystal structure, phase stability, and magnetism in Ni3V. PHYSICAL REVIEW. B, CONDENSED MATTER 1987; 35:6940-6943. [PMID: 9940952 DOI: 10.1103/physrevb.35.6940] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
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3086
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Yu J, Freeman AJ, Xu J. Electronically driven instabilities and superconductivity in the layered La2-xBaxCuO4 perovskites. PHYSICAL REVIEW LETTERS 1987; 58:1035-1037. [PMID: 10034315 DOI: 10.1103/physrevlett.58.1035] [Citation(s) in RCA: 196] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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3087
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3088
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Xu J, Wojcik WJ. Gamma aminobutyric acid B receptor-mediated inhibition of adenylate cyclase in cultured cerebellar granule cells: blockade by islet-activating protein. J Pharmacol Exp Ther 1986; 239:568-73. [PMID: 2430096] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
In primary cultures of cerebellar granule cells, the gamma aminobutyric acid B (GABAB) receptor couples to an inhibitory mechanism of adenylate cyclase. The inhibition of adenylate cyclase can be observed either by the measurement of cellular cyclic AMP content or by in vitro measurement of adenylate cyclase from plasma membrane of these cerebellar granule cells. The GABAB receptors can be stimulated by GABA and the GABA analog, baclofen. This receptor-mediated inhibition of adenylate cyclase was blocked by the pertussis toxin, islet-activating protein. Furthermore, the authors show that islet-activating protein catalyzed the ADP ribosylation of the guanine nucleotide inhibitory unit (MW 41,000) in the cerebellar granule cells. In summary, the authors provide evidence supporting the presence of a GABAB receptor in the cerebellar granule cells and suggest that this receptor couples with the guanine nucleotide inhibitory unit to inhibit the formation of cyclic AMP.
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3089
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Li LY, Xia JH, Dai HP, Xu FM, He XX, Xu J. Chromosome analyses of 2,319 cases in genetic counseling clinic. Chin Med J (Engl) 1986; 99:527-34. [PMID: 3100199] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
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3090
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Xu J, Thornton I. Arsenic in garden soils and vegetable crops. ENVIRONMENTAL GEOCHEMISTRY AND HEALTH 1986; 8:30. [PMID: 24213949 DOI: 10.1007/bf02311061] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
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3091
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Huang CB, Xu J, Huang JF, Meng XY. Sulphomucin colonic type intestinal metaplasia and carcinoma in the stomach. A histochemical study of 115 cases obtained by biopsy. Cancer 1986. [PMID: 2418938 DOI: 10.1002/1097-0142(19860401)57:7<1370::aid-cncr2820570721>3.0.co;2-j] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
One hundred fifteen gastroscopic biopsy specimens (54 cases of carcinoma and 61 of gastritis) were used in this histochemical study. Intestinal metaplasia (IM) was classified into small intestinal type (ST) and colonic type (CT). The former may be a reactive change only. The incidence of sulphomucin colonic type (SCT) metaplasia was higher in gastric carcinomas than in benign lesions (P less than 0.01), and a relation between SCT metaplasia and cancer was demonstrated by both histologic and histochemical procedures. This suggests that SCT IM is correlated with certain precancerous lesions. There was no significant difference in the incidence of O-acetyl sialomucin colonic type (OCT) metaplasia between benign and malignant diseases. Further study is needed to determine why slightly more than half of the SCT IM was accompanied by OCT IM.
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3092
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Huang CB, Xu J, Huang JF, Meng XY. Sulphomucin colonic type intestinal metaplasia and carcinoma in the stomach. A histochemical study of 115 cases obtained by biopsy. Cancer 1986; 57:1370-5. [PMID: 2418938 DOI: 10.1002/1097-0142(19860401)57:7<1370::aid-cncr2820570721>3.0.co;2-j] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
One hundred fifteen gastroscopic biopsy specimens (54 cases of carcinoma and 61 of gastritis) were used in this histochemical study. Intestinal metaplasia (IM) was classified into small intestinal type (ST) and colonic type (CT). The former may be a reactive change only. The incidence of sulphomucin colonic type (SCT) metaplasia was higher in gastric carcinomas than in benign lesions (P less than 0.01), and a relation between SCT metaplasia and cancer was demonstrated by both histologic and histochemical procedures. This suggests that SCT IM is correlated with certain precancerous lesions. There was no significant difference in the incidence of O-acetyl sialomucin colonic type (OCT) metaplasia between benign and malignant diseases. Further study is needed to determine why slightly more than half of the SCT IM was accompanied by OCT IM.
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3093
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Anholt R, Stoller C, Molitoris JD, Spooner DW, Morenzoni E, Andriamonje SA, Meyerhof WE, Bowman H, Xu J, Xu Z, Rasmussen JO, Hoffmann DH. Atomic collisions with relativistic heavy ions. VI. Radiative processes. PHYSICAL REVIEW. A, GENERAL PHYSICS 1986; 33:2270-2280. [PMID: 9896902 DOI: 10.1103/physreva.33.2270] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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3094
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Tucker JD, Xu J, Stewart J, Baciu PC, Ong TM. Detection of sister chromatid exchanges induced by volatile genotoxicants. TERATOGENESIS, CARCINOGENESIS, AND MUTAGENESIS 1986; 6:15-21. [PMID: 2426822 DOI: 10.1002/tcm.1770060103] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
To test the recently developed method of exposing cells to volatile compounds, phytohemagglutinin-stimulated human peripheral lymphocyte cultures were exposed to gaseous methyl bromide, ethylene oxide, and propylene oxide, as well as diesel exhaust. The cultures were placed in sterile dialysis tubing and inserted into enclosed flasks containing additional culture medium. The test compounds (in gaseous state) were diluted with air and bubbled through the flasks for various lengths of time. The cells were then washed and incubated for a total of 75 h. The harvest was performed according to established procedures, and second-division cells were scored for induction of sister chromatid exchanges (SCEs). The SCE frequency was more than doubled in the cultures treated with ethylene oxide and propylene oxide; methyl bromide also induced SCEs. Cultures treated with diesel exhaust showed an increase in the SCE frequency in cells from two of four donors tested. These results further substantiate the use of this method for detecting the induction of SCEs by airborne genotoxins.
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3095
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Mao HK, Xu J, Bell PM. Calibration of the ruby pressure gauge to 800 kbar under quasi-hydrostatic conditions. ACTA ACUST UNITED AC 1986. [DOI: 10.1029/jb091ib05p04673] [Citation(s) in RCA: 3225] [Impact Index Per Article: 84.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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3096
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Krishna G, Xu J, Nath J. Comparative mutagenicity studies of azo dyes and their reduction products in Salmonella typhimurium. JOURNAL OF TOXICOLOGY AND ENVIRONMENTAL HEALTH 1986; 18:111-9. [PMID: 3517355 DOI: 10.1080/15287398609530852] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
The arabinose-resistant and Ames assay systems of Salmonella typhimurium were used to evaluate the mutagenic potential of azo dyes and their aromatic amine reduction products. Azo dyes, namely direct black 38, direct blue 15, and direct red 2, were mutagenic in the arabinose-resistant and Ames assays with both hamster and rat liver S9 activation. Both assays gave relatively higher mutagenic responses with hamster S9. Reduction products of these dyes, namely benzidine, o-dianisidine, and o-tolidine, were mutagenic in the Ames assay. Benzidine was weakly mutagenic and o-dianisidine and o-tolidine were nonmutagenic in the arabinose-resistant assay. These results indicate that both arabinose-resistant tester SV50 and Ames tester TA98 were sensitive in detecting mutagenicity of azo dyes. The use of the standard plate protocol with Ames tester TA98 is more efficient than the modified azo dye protocol in detecting mutagenicity of aromatic amine reduction products. Additional modifications in either the standard plate or modified azo dye protocols may improve detection of mutagenicity of these compounds in the arabinose-resistant assay system.
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3097
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Xu J, Thornton I. Arsenic in garden soils and vegetable crops in Cornwall, England: Implications for human health. ENVIRONMENTAL GEOCHEMISTRY AND HEALTH 1985; 7:131-133. [PMID: 24213800 DOI: 10.1007/bf01786639] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/07/1985] [Accepted: 10/11/1985] [Indexed: 06/02/2023]
Abstract
Total concentrations of arsenic in surface (0-15cm) garden soils in the historical mining area of Hayle-Camborne-Godolphin, Cornwall, England are large and range widely (144-892 μg/g). Amounts of water soluble and acid-fluoride extractable soil arsenic are significantly correlated with total content.Examination of 6 salad and vegetable crops grown in 32 gardens has shown arsenic concentrations in the edible tissues to be only slightly elevated. There were strong correlations between arsenic in beetroot, lettuce, onion and peas and soil arsenic (total, water soluble and acid extractable). Regression equations have been calculated. Ridge regression analysis applied to test the importance of other soil variables has shown both iron and phosphorus to influence the uptake of arsenic.Arsenic in all the vegetables sampled was below the statutory limit in the U.K. of 1 mg/kg fresh weight. Implications for health should be assessed in relation to other exposure routesvia water, air and directly ingested dust and soil.
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3098
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Krishna G, Xu J, Nath J, Petersen M, Ong T. In vivo cytogenetic studies on mice exposed to ethylene dibromide. Mutat Res 1985; 158:81-7. [PMID: 3900721 DOI: 10.1016/0165-1218(85)90101-6] [Citation(s) in RCA: 31] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
The pesticide, ethylene dibromide (EDB), was evaluated with in vivo cytogenetic assays to determine its genotoxicity. CD1 male mice were exposed to EDB through intraperitoneal injections. Bone marrow cells isolated from femora were analyzed for sister-chromatid exchange (SCE), chromosome aberration and micronucleus formation. The results showed that only certain concentrations of EDB tested caused a slight but significant increase in SCEs and chromosome aberrations. However, these increases were not dose-related. No increase in the polychromatic erythrocytes with micronuclei was observed following EDB exposure. Also, EDB did not cause cell-cycle delay in comparison with controls. Thus, it appears that EDB is not an effective genotoxic agent in vivo in mice.
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3099
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Shen SY, Xu J, Jin GZ. [Effect of 13 cholinergic antagonists on M-cholinergic receptors in rat hearts]. ZHONGGUO YAO LI XUE BAO = ACTA PHARMACOLOGICA SINICA 1985; 6:158-61. [PMID: 2943116] [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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3100
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Xu J, Zhong QP, Lu D. [Effect of ganoderma extract on murine immunocytes]. ZHONGGUO YI XUE KE XUE YUAN XUE BAO. ACTA ACADEMIAE MEDICINAE SINICAE 1985; 7:301-4. [PMID: 2939994] [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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