826
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Xia Y, Baidan LV, Fertel RH, Wood JD. Determination of levels of cyclic AMP in the myenteric plexus of guinea-pig small intestine. Eur J Pharmacol 1991; 206:231-6. [PMID: 1713166 DOI: 10.1016/s0922-4106(05)80023-9] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Enzymatically dissociated ganglia from the myenteric plexus of the guinea-pig small intestine were used to investigate changes in levels of cyclic 3',5'-adenosine monophosphate (cAMP) in response to stimulation of adenylate cyclase by forskolin and inhibition of phosphodiesterase by 3-isobutyl-1-methylxanthine (IBMX). A linear relation with a positive correlation coefficient greater than 0.98 was found between: (1) amount of cAMP and number of ganglia; (2) amount of protein and number of ganglia; (3) amount of DNA and amount of protein; (4) amount of DNA and number of ganglia. Basal levels of cAMP were 2.25 +/- 0.21 fmol per ganglion for 900 ganglia. Forskolin stimulated a dose-dependent increase in cAMP over a concentration range of 0.05 to 50 microM, with a level of 18.6 +/- 4.9 fmol/ganglion at 50 microM forskolin. The inactive forskolin analog 1,9-dideoxyforskolin did not elevate cAMP. Addition of IBMX to the incubation medium stimulated a dose-dependent increase in cAMP over a concentration range of 0.1-1000 microM, with a level of 17.58 +/- 3.38 fmol/ganglion at 1000 microM IBMX. Application of 1 mM IBMX strongly potentiated the stimulating action of forskolin on cAMP levels. Our results derived from direct determination of cAMP changes in small intestinal myenteric ganglia are consistent with existing electrophysiological evidence for second messenger function of cAMP in slow synaptic modulation of excitability in AH/Type 2 neurons of the enteric nervous system.
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827
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Marcus SN, Schteingart CD, Marquez ML, Hofmann AF, Xia Y, Steinbach JH, Ton-Nu HT, Lillienau J, Angellotti MA, Schmassmann A. Active absorption of conjugated bile acids in vivo. Kinetic parameters and molecular specificity of the ileal transport system in the rat. Gastroenterology 1991; 100:212-21. [PMID: 1983823 DOI: 10.1016/0016-5085(91)90603-i] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Active transport of conjugated bile acids by the distal ileum is required for efficient enterohepatic cycling of bile acids. Experiments were performed in the rat to obtain accurate values for Tmax and Michaelis constant (Km) of the absorptive area of the rat ileum and to define the structural specificity of the transport system. The distal fifth (20 cm) of the small intestine from an anesthetized animal with a biliary fistula was perfused using solutions of 10 taurine-conjugated bile acids; a flow rate was used that was sufficiently high such that unstirred water layer effects were negligible and the intraluminal concentration remained unchanged throughout the perfused segment. The absorption rate was equated with the rate of hepatic bile acid secretion. Values of Tmax (mumol/min.kg) were markedly influenced by bile acid structure: cholyltaurine, 12.9; ursocholyltaurine, 9.6; ursodeoxycholyl taurine, 5.0; and lagodeoxycholyl-(3 alpha,12 beta-dihydroxy-cholanoic acid)-taurine, 1.2. Decreasing the length of the side chain of ursodeoxycholate conjugates from 8 to 6 carbon atoms was associated with a modest increase in Tmax values from 5.0 to 9.1 mumols/min.kg. Values of Km correlated with Tmax values and ranged from 0.5 to 5 mmol/L, being highest for those bile acids that were best transported. The Tmax for cholyltaurine transport was not reached when the intraluminal concentration was as high as its critical micellization concentration, precluding the definition of its Tmax; however, for ursocholyltaurine, with a critical micellization concentration of 40 mmol/L, saturation of transport was clearly shown. Kinetic parameters could not be obtained for two common dihydroxy conjugates (chenodeoxycholyltaurine and deoxycholyltaurine) because at a transport rate of 2 mumols/min.kg systemic toxicity and death occurred. These studies define the maximal transport capacity of the rat ileum for taurine-conjugated bile acids; they indicate that the ileal transport system in the rat is of low affinity and high capacity for taurine conjugates of hydrophilic bile acids, and they show that both nuclear substituents and side chain length influence the transport rate of taurine-conjugated bile acids.
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828
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Wine JJ, Brayden DJ, Hagiwara G, Krouse ME, Law TC, Müller UJ, Solc CK, Ward CL, Widdicombe JH, Xia Y. Cystic fibrosis, the CFTR, and rectifying Cl- channels. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 1991; 290:253-69; discussion 269-72. [PMID: 1719763 DOI: 10.1007/978-1-4684-5934-0_25] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
The human genetic disease cystic fibrosis is caused by a single defective gene on chromosome 7 that codes for a 1480 amino acid protein called the cystic fibrosis transmembrane conductance regulator (CFTR). The defect causes a profound reduction of Cl- permeability in several tissues, which in turn impairs salt absorption and fluid secretion. A 25-80 pS, rectifying Cl- channel has been targeted as the exclusive or primary channel affected in CF. However, we have found no evidence for significant activation or spontaneous activity of this channel in cell-attached patches of normal lymphoblasts or dog tracheal cells. However, in dog tracheal cells, we find lower conductance, linear Cl- channels that are spontaneously active in unstimulated cells and may show increased activity in stimulated cells. Attempts to correlate the expression of mRNA for the CFTR protein in various types of cells with the presence of the rectifying Cl- channel show a lack of correlation: i.e., depolarization-activated rectifying Cl- channesl have been found in excised, inside-out patches from all cell types that we have examined to date, but the CFTR mRNA has so far only been detected in a subset of epithelial cells.
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829
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Chen Q, Yang CY, Tsan JT, Xia Y, Ragab AH, Peiper SC, Carroll A, Baer R. Coding sequences of the tal-1 gene are disrupted by chromosome translocation in human T cell leukemia. J Exp Med 1990; 172:1403-8. [PMID: 2230650 PMCID: PMC2188666 DOI: 10.1084/jem.172.5.1403] [Citation(s) in RCA: 68] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
The tal-1 proto-oncogene encodes a helix-loop-helix DNA-binding protein that has been implicated in the formation of T cell acute lymphoblastic leukemia (T-ALL). Patients with T-ALL harbor structural rearrangements of tal-1 that result from either local DNA deletion or t(1;14)(p34;q11) chromosome translocation. By analyzing t(1;14)(p34;q11) chromosomes from a series of patients, we have now identified a discrete region of tal-1 wherein most of the translocation breakpoints occur. Moreover, mapping of tal-1 genomic DNA revealed that coding exons are situated on both sides of the t(1;14)(p34;q11) major breakpoint region. Hence, the translocated allele of tal-1 is truncated in a manner that reduces its amino acid coding potential.
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830
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Xia Y, Lambert KJ, Schteingart CD, GU JJ, Hofmann AF. Concentrative biliary secretion of ceftriaxone. Inhibition of lipid secretion and precipitation of calcium ceftriaxone in bile. Gastroenterology 1990; 99:454-65. [PMID: 2365194 DOI: 10.1016/0016-5085(90)91029-6] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The hepatic transport of ceftriaxone, a third-generation cephalosporin, was characterized in the rat and hamster; its effect on bile flow and bile acid-induced biliary lipid secretion was also measured. In anesthetized rats with biliary fistulae, the Tmax was about 5 mumol.min-1.kg-1, and in the hamster the Tmax was about 1 mumol.min-1.kg-1. The compound was not biotransformed. At high secretion rates, the concentration of cephalosporin in bile increased to 27 mmol/L, a concentration far exceeding the solubility product of its calcium salt [2 x 10(-6) (mol/L)2], which precipitated from bile. In the rat, ceftriaxone induced choleresis (22 microL/mumol ceftriaxone, the expected value for a dianionic compound). In the isolated perfused rat liver, ceftriaxone had a fractional hepatic extraction rate averaging 3%; the compound was concentratively secreted into bile, the bile-perfusate ratio ranging from 35-250. Ceftriaxone inhibited phospholipid and cholesterol secretion induced by endogenous or exogenous bile acids; the rate of inhibition was linearly proportional to the canalicular secretion rate of ceftriaxone. Hepatic transport of ceftriaxone had no influence on hepatic secretion of ursodeoxycholyltaurine. In contrast, the net hepatic transport of ursodeoxycholic acid, ursodeoxycholyltaurine, or cholyltaurine inhibited ceftriaxone transport in a dose-dependent manner. It is concluded that ceftriaxone and bile acids share a common mechanism for hepatic transport in the rat and also interact in the processes involved in biliary lipid secretion. Biliary secretion of unbiotransformed ceftriaxone occurs at high concentrations; secondary Ca2+ entry results in the formation of supersaturated canalicular bile and subsequent precipitation as a calcium salt in the biliary tract. These data explain the formation of biliary sludge that occurs in patients undergoing high-dose ceftriaxone therapy.
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831
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Yu CX, Wang QP, Xia Y, Xu SF. [Relationship between spinal PCP receptor on cardiovascular effect and noradrenergic system]. SHENG LI XUE BAO : [ACTA PHYSIOLOGICA SINICA] 1990; 42:331-9. [PMID: 2175945] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
By using receptor blockade, HPLC, destroying catecholaminergic nerve terminals by 6-OHDA, autoradiography, and other techniques, the relationship between effects of the spinal PCP receptor on cardiovascular function and noradrenergic system was studied. The main results were as following. Hypotension and bradycardia induced by ith PCP were significantly antagonized by prazosin and yohimbine; the MHPG levels in spinal CSF were significantly increased during the ith PCP induced hypotension and bradycardia; pretreatment with 6-OHDA to destroy NA terminals in the spinal cord significantly decreased the ith PCP induced hypotension and bradycardia, and the density of PCP receptors in the spinal cord. The results suggest that there are PCP receptors on the NA terminals in the spinal cord, which promoted the release of NA and/or inhibited the reuptake of NA. This may be a possible mechanism underlying the influence of spinal PCP receptors on cardiovascular function.
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832
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Xia Y. [A lingulate valve formed from full layer of the jejunum in Roux-en-Y choledocho-jejunostomy and its effect against regurgitation of intestinal contents]. ZHONGHUA WAI KE ZA ZHI [CHINESE JOURNAL OF SURGERY] 1990; 28:365-6, 382. [PMID: 2096066] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
A lingulal valve formed from full layer of the jejunum designed to work against regurgitation of intestinal contents was reported. Animal experiment and the observation on fresh bodies documented that it could prevent regurgitation at the pressure of 2.94 kPa (300 mmH2O). The valve-plasty was added to Roux-en-Y choledocho (pancreatico)-jejunostomy in ten cases with satisfactory results. The procedure is not technically difficult, and long term follow-up found no severe complications.
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833
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Sun FY, Zhang AZ, Xia Y. [Mechanism of dynorphin inhibition on vasoconstriction in vitro]. SHENG LI XUE BAO : [ACTA PHYSIOLOGICA SINICA] 1989; 41:354-60. [PMID: 2574913] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Bioassay and HPLC detection were used to analyze the mechanism of inhibition of stimulation-induced vasoconstriction by dynorphin 1-13 (D1-13). Bioassay showed that D1-13 inhibited the contraction of rabbit ear artery and mesenteric artery induced by electrical field stimulation with IC50s of 8.5 +/- 1.2 x 10(-8) mol/L (n = 4) and 5.02 +/- 1.3 x 10(-7) mol/L (n = 5), respectively. D1-13 was ineffective in rabbit femoral artery at a concentration even larger than 10(-6) mol/L. D1-13 did not alter the basal tension of the blood vessel, nor the vasoconstriction induced by adding norepinephrine (NE) into the bath medium, and both constriction were markedly inhibited by phentolamine, an alpha-adrenoceptor blocker. With HPLC detection, the contents of NE in the bath medium were significantly reduced by D1-13 (5 x 10(-7) mol/L) from 340.56 +/- 73.13 pg/ml to 76.91 +/- 10.26 pg/ml as compared with control group (P less than 0.05). The effect could be completely reversed by naloxone at a concentration of 10(-6) mol/L (P less than 0.05). The results suggest that D1-13 reduces stimulation-induced vasoconstriction probably through a presynaptic inhibition of NE release from the nerve terminals.
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834
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Lambert RK, Pack RJ, Xia Y, Eccles CD, Callaghan PT. In vitro tracheal mechanics by nuclear magnetic resonance imaging. J Appl Physiol (1985) 1988; 65:1872-9. [PMID: 3182547 DOI: 10.1152/jappl.1988.65.4.1872] [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: 01/04/2023] Open
Abstract
Images of rabbit tracheal cross sections were obtained at a series of transmural pressures ranging from 22 to -95 cmH2O by use of a nuclear magnetic resonance imaging microscope. The excised, washed tracheas were immersed in a solution of phosphate-buffered saline made up in deuterium oxide (D2O, pH 7.3). The images are maps of proton density in the image slice (2.5 mm thick). All but one series of images showed a collapse process in which the trachealis muscle invaginated asymmetrically, i.e., the muscle appeared to favor one side of the cartilage ring system more than the other. The connecting tissue between the cartilage rings appeared to be more compliant than the rings themselves, thus suggesting that the tracheal lumen became corrugated at negative pressures. In the plane of a cartilage ring, the lumen appeared to remain patent at pressures as low as -95 cmH2O. However, between rings, where the tracheal wall was more compliant, the lumen appeared to be totally occluded at -53 cmH2O. Lumen areas in both the plane of the cartilage rings and in a plane between rings were measured from each series of printed images for six tracheas. These measurements, when normalized, averaged, and plotted against transmural pressure gave asymptotic logarithmic compliances (n1 in the model of Lambert et al., J. Appl. Physiol. 52: 44-56, 1982) of 1.2 +/- 0.4 and 20 +/- 7 for the interring and ring regions, respectively. These values are greater than the critical value of 0.5 (J. Appl. Physiol. 62: 2426-2435, 1987) and are thus consistent with wave speed flow limitation being possible anywhere in the trachea during forced expiration.
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835
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Xia Y, Zhang AZ, Cao XD. [Increased leu-enkephalin immunoreactivity in cerebrospinal fluid during stimulation of hypothalamic defence area in rabbits]. SHENG LI XUE BAO : [ACTA PHYSIOLOGICA SINICA] 1988; 40:379-81. [PMID: 3247601] [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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836
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Xia Y, Zhang AZ, Cao XD, Tang QM, Xu XR. Inhibitory effect of analogous electroacupuncture on sympathetic cardiovascular response to stimulation of hypothalamic defence area in rabbits. J TRADIT CHIN MED 1987; 7:211-4. [PMID: 2451092] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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837
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Shi F, Chen CC, Xia Y. [Amino acid analysis of pigment gallstones]. ZHONGHUA WAI KE ZA ZHI [CHINESE JOURNAL OF SURGERY] 1987; 25:333-5, 380. [PMID: 3691235] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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838
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Xia Y. [Intraplatelet 5-hydroxytryptamine and plasma 5-hydroxyindoles in essential hypertension]. ZHONGHUA YI XUE ZA ZHI 1987; 67:269-71. [PMID: 3115526] [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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839
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Xia Y, Dai GZ, Zhou BC. [Levels of intra- and extra-platelet 5-HT-analogous substances and the effect of 5-HT on platelet aggregation in acute myocardial infarction]. ZHONGHUA XIN XUE GUAN BING ZA ZHI 1987; 15:83-5, 127. [PMID: 3622261] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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840
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Xia Y, Dai GZ. [Effects of 5-hydroxytryptamine on various cardiovascular diseases]. ZHONGHUA YI XUE ZA ZHI 1987; 67:115-7. [PMID: 3109710] [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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841
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Xia Y, Burbank DE, Van Etten JL. Restriction endonuclease activity induced by NC-1A virus infection of a Chlorella-like green alga. Nucleic Acids Res 1986; 14:6017-30. [PMID: 3018667 PMCID: PMC311618 DOI: 10.1093/nar/14.15.6017] [Citation(s) in RCA: 31] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
A type II restriction endonuclease, CviBI, was isolated from a eukaryotic, Chlorella-like green alga infected with the dsDNA containing virus NC-1A. The enzyme recognizes the sequence GANTC and cleaves DNA between the G and A. Methylation of deoxyadenosine in the GANTC sequence probably inhibits enzyme activity. In vitro CviBI cleaves host nuclear DNA but not viral DNA. A survey of 18 other viruses which infect the same Chlorella sp. revealed that infection with 5 of these viruses also induced a restriction endonuclease which cleaves DNA into the same size fragments as CviBI.
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842
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Lu GW, He GR, Li QJ, Zhang S, Xia Y. [Electrophysiological studies on bifurcation sites of the dual projection neurons from the cat spinal dorsal horn]. SHENG LI XUE BAO : [ACTA PHYSIOLOGICA SINICA] 1986; 38:243-50. [PMID: 3775406] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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843
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Lü GW, Zhang S, Xia Y. Electrophysiological studies on the termination sites of double projection spinal dorsal horn neurons in the cat. SCIENTIA SINICA. SERIES B, CHEMICAL, BIOLOGICAL, AGRICULTURAL, MEDICAL & EARTH SCIENCES 1986; 29:634-43. [PMID: 3810120] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Some projection neurons in laminae III, IV and V of the feline lumbar dorsal horn have been found to be antidromically driven from stimulation of both the ipsilateral cervical dorsal and dorsolateral funiculi that are well-dissected and insulated from one another. No detectable responses can be evoked from these neurons when stimulation is applied to sites rostral to the lateral cervical nucleus and the dorsal column nuclei, suggesting that the dorsal and dorsolateral funicular branches of these neuron's axons terminate in the lateral cervical nucleus and the dorsal column nuclei, respectively. The results indicate that these neurons are an intersection set of the spinal cervical tract (SCT) and dorsal column postsynaptic (DCPS) neurons and have been thus named spinal cervical tract-dorsal column postsynaptic (SCT-DCPS) neurons.
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844
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845
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Xia Y, Zhang AZ, Cao XD. Roles of opioid peptides of PAG in analogous electro-acupuncture inhibition of experimental arrhythmia: analyzed by specific antisera microinjection. ACUPUNCTURE ELECTRO 1986; 11:191-8. [PMID: 2433903 DOI: 10.3727/036012986816359076] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Using specific antisera microinjected into periaqueductal grey (PAG), we further studied the mechanism of the analogous electroacupuncture, deep peroneal nerve stimulation (DPNS), inhibition on the experimental arrhythmia, hypothalamic stimulation-induced ventricular extrasystoles (HVE). Neither normal serum nor anti-leu-enkephalin antiserum interfered with DPNS inhibition; anti-dynorphin A (1-8) tended to attenuate the inhibition; and anti-beta-endorphin antiserum blocked it. The results provided further evidence for the hypothesis that beta-endorphin in PAG plays an important role in the neural circuit of DPNS inhibition on HVE.
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846
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Xia Y, Guo XQ, Li P. [Role of the medial medulla in the inhibitory effect of somatic afferent nerve stimulation on ventricular extrasystoles induced by hypothalamic stimulation in the rabbit]. SHENG LI XUE BAO : [ACTA PHYSIOLOGICA SINICA] 1985; 37:37-43. [PMID: 2420013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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847
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Xia Y, Guo XQ, Zhang AZ, Cao XD, Li P. Inhibitory effect of analogous electro-acupuncture on experimental arrhythmia. ACUPUNCTURE ELECTRO 1985; 10:13-34. [PMID: 2409754 DOI: 10.3727/036012985816714595] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Rabbits were used to study the inhibitory effect of analogous electro-acupuncture on the experimental arrhythmias, i.e. hypothalamic stimulation-induced ventricular extrasystole (HVE). The result revealed that HVE, which was due to an increased cardiac sympathetic activity, could be inhibited by deep peroneal nerve stimulation with an electrical current of low frequency and low intensity. Such effect is related to endogenous opioid peptides and serotonin in the arcuatus area, the periaqueductal gray and and the medial medulla. The acupuncture correction of arrhythmias may have the same mechanism.
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848
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Xia Y. [Central neurotransmitters and cardiovascular activity]. SHENG LI KE XUE JIN ZHAN [PROGRESS IN PHYSIOLOGY] 1985; 16:27-31. [PMID: 2860721] [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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849
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Skrdla MP, Burbank DE, Xia Y, Meints RH, Van Etten JL. Structural proteins and lipids in a virus, PBCV-1, which replicates in a Chlorella-like alga. Virology 1984; 135:308-15. [PMID: 6740941 DOI: 10.1016/0042-6822(84)90188-0] [Citation(s) in RCA: 64] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
PBCV-1, a large dsDNA-containing virus which replicates in a Chlorella-like green alga, is composed of approximately 64% protein, 25% DNA, and 5-10% lipid on a weight basis. Polyacrylamide gel electrophoresis of the dissociated virus particle resolves 50 to 60 proteins which range in apparent molecular weight from 10,000 to 135,000. Two of these proteins are glycoproteins and at least four are located on the viral surface. The major lipids are phosphatidyl choline, phosphatidyl ethanolamine, and an unidentified component. The effect of organic solvents, surfactants, and chelating and reducing agents on viral infectivity and ultrastructure are reported. Inhibitor studies established that PBCV-1 protein synthesis occurs on cytoplasmic ribosomes.
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850
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Zheng XY, Xia Y, Gao FH, Chen C. [Synthesis of 7351, a new antimalarial drug (author's transl)]. YAO XUE XUE BAO = ACTA PHARMACEUTICA SINICA 1979; 14:736-7. [PMID: 554435] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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