1051
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Pilcher JB, Tsang VC, Zhou W, Black CM, Sidman C. Optimization of binding capacity and specificity of protein G on various solid matrices for immunoglobulins. J Immunol Methods 1991; 136:279-86. [PMID: 1999655 DOI: 10.1016/0022-1759(91)90014-7] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Streptococcal protein G is a more versatile and efficient alternative to staphylococcal protein A in purifying immunoglobin G (IgG) isotypes from various animal species. Optimizations are most dramatic with goat IgG, which binds protein G 55 times better than protein A. Using GammaBind G (a recombinant form of protein G (Genex Corp.)), we optimized binding capacity and specificity for IgG. Protein G was covalently coupled to three different matrices (CNBr-Sepharose, Tresyl-Sepharose, and Affigel-10) and compared with protein A-CNBr-Sepharose. Equal volumes of human, mouse, and goat serum samples were equilibrated into Hepes/NaOH buffers with various ionic strengths (i.e., concentrations of NaCl) and pH values and allowed to bind to affinity columns of proteins G and A. Bound ligands were eluted with 8.0 M urea, 0.05-M Tris/HCl, pH 8.00. Bound fractions were assayed for protein concentration and analyzed by sodium dodecyl sulfate polyacrylamide electrophoresis. The optimal conditions for binding IgG to protein G are 1.0 M NaCl and pH 8.0 for human, mouse, and goat.
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Affiliation(s)
- J B Pilcher
- Division of Parasitic Diseases, Centers for Disease Control, Public Health Service, U.S. Department of Health and Human Services, Atlanta, GA 30333
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1052
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Zhou W, Paesler M, Sayers DE. Structure of germanium-selenium glasses: An x-ray-absorption fine-structure study. Phys Rev B Condens Matter 1991; 43:2315-2321. [PMID: 9997507 DOI: 10.1103/physrevb.43.2315] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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1053
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Schügerl K, Brandes L, Dullau T, Holzhauer-Rieger K, Hotop S, Hübner U, Wu X, Zhou W. Fermentation monitoring and control by on-line flow injection and liquid chromatography. Anal Chim Acta 1991. [DOI: 10.1016/0003-2670(91)87012-v] [Citation(s) in RCA: 30] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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1054
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Huang L, Zhou W. [The relationship of structure in vivo of low tension glaucoma and myopia]. Yan Ke Xue Bao 1990; 6:58-9, 94. [PMID: 2289575] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The structure in vivo and incidence of myopia on thirty patients with low tension glaucoma were studied in this paper. Results showed that the incidence of high myopia of patients with low tension glaucoma was higher than normal. All of the mean values of the thickness of lens, the length of vitreous and axis, and the area of optic disc were larger than normal too. These indicate that patients with low tension glaucoma may often be associated with high myopia, and their structure of eye in vivo differs from normal. These may be related to pathogenesis of disease with low tension glaucoma. The relationship of myopia and structure of optic disc with glaucoma were briefly summarized.
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Affiliation(s)
- L Huang
- Zhongshan Ophthalmic Center, Sun Yat-sen University of Medical Sciences, Guangzhou, China
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1055
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1056
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Zhou W, Perry CH, Worlock JM. High-pressure magneto-optical studies of two-dimensional-electron and exciton transitions in GaAs-AlxGa1-xAs quantum-well heterostructures. Phys Rev B Condens Matter 1990; 42:9657-9663. [PMID: 9995205 DOI: 10.1103/physrevb.42.9657] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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1057
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Zhou W. [Computer study of pathologic factors influencing survival in colorectal carcinoma--a multivariant stepwise discriminant analysis]. Zhonghua Zhong Liu Za Zhi 1990; 12:354-6. [PMID: 2177397] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Five quantitative pathologic parameters and three clinicopathologic parameters in 80 colorectal carcinoma patients with different prognosis were studied with a multivariant stepwise discriminant analysis on computer. The results showed that DNA index (DI), nucleocytoplasmic ratio (NCR), histologic grade and Dukes' stage were significant factors influencing the survival. With these factors, a 4-variable Fisher's discriminant function was established, which could correctly identify 81.25% and 83.75% of the predicted cases (Jacknife Procedure and Reclassification) Sensitivity of the two methods was 87.80%. The results indicate that the multivariant stepwise discriminant analysis on quantitative pathologic parameters combined with clinicopathologic parameters is of value in predicting prognosis of colorectal carcinoma patients.
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Affiliation(s)
- W Zhou
- People's Hospital, Beijing Medical College
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1058
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Zhou W, Porch A, Van Damme I, Jefferson D, Liang W, Edwards P. A study of the structural series in the TlCaBaCuO superconducting system. J SOLID STATE CHEM 1990. [DOI: 10.1016/0022-4596(90)90215-j] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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1059
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Zhou W. [Pharmacognostical study on polyporus]. Zhongguo Zhong Yao Za Zhi 1990; 15:459-61, 510. [PMID: 2093316] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- W Zhou
- Shaanxi Province, Xian Municipal Institute for Drug Control
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1060
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Abstract
LHRH (chicken II luteinizing hormone-releasing hormone) partially reduces calcium currents and slows the activation kinetics of part of the remaining current in frog sympathetic neurons. The effects of LHRH are mimicked by intracellular dialysis with GTP-gamma-S. A strong depolarization can temporarily reverse the effects of LHRH or GTP-gamma-S: activation kinetics return to normal, and the amplitude of the current is increased (facilitation). Facilitation develops rapidly (tau = 4-6 ms at greater than +30 mV) and decays more slowly (t 1/2 = 60 ms at -80 mV). Tail currents in LHRH are smaller and faster than in the control, and these effects are partially reversed by facilitation. These results can be explained by a model in which a fraction of the channels is shifted into a "reluctant" gating mode, where opening requires stronger depolarization. If this mechanism is at the root of presynaptic inhibition, our results predict that inhibition of transmitter release would be overcome during bursts of high frequency activity.
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Affiliation(s)
- K S Elmslie
- Department of Physiology and Biophysics, Case Western Reserve University, Cleveland, Ohio 44106
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1061
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Abstract
The correlations of essential element Se between human hair and kidney-cortex, liver, and lung from the same subjects were investigated by instrumental neutron activation analysis, using the reaction 76Se (n, gamma) 77mSe, for 24 Chinese autopsies. The concentration of Se is higher in kidney-cortex (2.04-5.36 mg/kg) than in liver (0.73-2.29), lung (0.50-1.85), and hair (0.37-1.43). It is important to know that there are significant relationships of Se concentration between hair and the other three internal organs. The correlation coefficient by linear regression analysis are 0.639, 0.570, and 0.635 for liver, lung, and kidney-cortex, respectively; and the P values are all less than 0.01 for the three tissues.
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Affiliation(s)
- Y D Cheng
- Shanghai Institute of Nuclear Research, People's Republic of China
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1062
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Peng T, Wu L, Zhou W. Retinitis pigmentosa associated with glaucoma--clinical analysis. Yan Ke Xue Bao 1990; 6:17-9. [PMID: 2101353] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
A clinical analysis of Retinitis Pigmentosa (RP) was made in 2,789 eyes of 1,400 patients seen over a 5 year period (1983-1987), 64 eyes of 32 cases (2.3%) of RP associated with glaucoma were investigated. Of these 32 cases, the angle closure glaucoma was much more than the open angle glaucoma (30/2). More than half of the 32 cases were without cupping of disk, 5 cases did not have the glaucomatous damage to disk in spite of persistent elevated intraocular pressure for 0.5-5 yrs under the maximum medical therapy. 31 cases (97%) had subnormal blood pressure compared with the normal blood pressure value in different age groups. Histopathologic changes of the trabecular meshwork (TM) of 14 eyes showed a little bit more pigment cells in the TM than normal subjects, no typical features that would obstruct the outflow channels.
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Affiliation(s)
- T Peng
- Zhongshan Ophthalmic Centre, Sun Yat-san University of Medical Sciences, Guangzhou, China
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1063
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1064
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Tang S, Deng S, Zhou W, Li S. [Pancreatic glucagon receptor radioassay with liver cell plasma membrane in normal and streptozotocin-induced diabetic rats]. Hua Xi Yi Ke Da Xue Xue Bao 1990; 21:34-8. [PMID: 2163972] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Pancreatic glucagon receptor radioassay has been developed with rat liver cell plasma membrane prepared with sucrose gradient centrifugation. 125I-glucagon was prepared in this laboratory and the separation of B/F was done by low speed centrifugation with addition of PEG (W/V, 20%) and normal human serum. The specific binding of 125I-glucagon was 25%-35% and nonspecific binding was less than 5%. Reproducibility within and between- assay was 6.83% and 8.40% (CV%), respectively. Binding characteristics of glucagon receptor of normal and streptozotocin-induced diabetic rats were determined by using two methods, receptor dilution and conventional competitive binding assay. The results showed that there were no marked differences concerning high and low binding affinities between normal and diabetic rats, but the concentration of binding sites for both high and low affinity receptors was significantly higher for diabetic rats than normal rats. The possible mechanisms for the above results have been discussed.
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1065
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Holzhauer-Rieger K, Zhou W, Schügerl K. On-line high-performance liquid chromatography for the determination of cephalosporin C and by-products in complex fermentation broths. J Chromatogr A 1990; 499:609-15. [PMID: 2324218 DOI: 10.1016/s0021-9673(00)97005-5] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
A fully automated high-performance liquid chromatographic system was developed for optimization of cephalosporin C production. Using a simple, isocratic, reversed-phase method, cephalosporin C, deacetylcephalosporin C, deacetoxycephalosporin C, penicillin N, methionine and its decomposition product 2-hydroxy-4-methylmercaptobutyric acid were determined. The method worked reliably for 250 h and supplied information on the influence of many parameters of the process.
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1066
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Abstract
The effect of Danshen (Radix salviae miltiorrhizae) on mechanical activity and coronary flow rate of isolated rat hearts was examined to assess the ability of Danshen to protect the myocardium against the effects of ischemia and reperfusion. After 20 min of control perfusion, in the presence or absence of Danshen, the hearts were made totally ischemic for 30 min and then reperfused for 30 min. Danshen had a negative inotropic effect and caused an increase of coronary flow rate. During post-ischemic reperfusion recovery of left ventricular developed pressure in the Danshen-treated hearts was significantly better and contracture was significantly less than in the untreated hearts. The results indicate that Danshen protects the heart against some of the deleterious effects of ischemia and reperfusion.
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Affiliation(s)
- W Zhou
- Department of Cardiology, University Hospital, Utrecht, The Netherlands
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1067
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Brand JA, Tsang VC, Zhou W, Shukla SB. Comparison of particulate 3,3',5,5'-tetramethylbenzidine and 3,3'-diaminobenzidine as chromogenic substrates for immunoblot. Biotechniques 1990; 8:58-60. [PMID: 2322454] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
In horseradish peroxidase (EC: 1.11.1.7)-dependent immunoblot assays, particulate 3,3',5,5'-tetramethylbenzidine (TMB) is shown to be a more efficient immunoblot substrate than the standard substrate 3,3'-diaminobenzidine (DAB), because TMB is easily prepared, stable, and less carcinogenic than is DAB. Assays of antibody in a serially diluted human immunodeficiency virus (HIV) control serum (CDC reference CAT# VS2151) have the same sensitivity limits with both DAB and TMB (1:312,500). Complete, working substrate solutions of H2O2/TMB/enhancer and of H2O2/DAB were stored at room temperatures and at 48 degrees C respectively. Periodic tests showed the TMB substrate system to be functional after four weeks at 48 degrees C and after eight weeks at room temperature, while the DAB system was functional after one week at 48 degrees C and after four weeks at room temperature. The stability, safety, and convenience of the commercially available TMB kits make this substrate ideal for immunoblot tests.
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1068
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Zhou W, Qu L, Zhang Q, Wang D. Interaction and charge transfer in the iron nitride Fe4N. Phys Rev B Condens Matter 1989; 40:6393-6397. [PMID: 9992713 DOI: 10.1103/physrevb.40.6393] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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1069
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Zhou W, Kirkland AI, Mackay KD, Armstrong AR, Harrison MR, Jefferson DA, Liang WY, Edwards PP. High Resolution Electron Microscopy of the High-Tc superconductor Bi2+xSr2Ca1−xCu2O8+δ. Angew Chem Int Ed Engl 1989. [DOI: 10.1002/ange.19891010653] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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1070
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Zhou W, Kirkland AI, Mackay KD, Armstrong AR, Harrison MR, Jefferson DA, Liang WY, Edwards PP. High Resolution Electron Microscopy of the High-Tc Superconductor Bi2+xSr2Ca1−xCu2O8+δ. ACTA ACUST UNITED AC 1989. [DOI: 10.1002/anie.198908101] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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1071
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Zhou W. [Measurement of the anterior chamber depth with the slitlamp and the keratometer]. Zhonghua Yan Ke Za Zhi 1989; 25:112-4. [PMID: 2507253] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
A simple and accurate formula for the measurement of the anterior chamber depth with keratometer and slitlamp is described. The calculation takes into consideration the curvature of the anterior corneal surface and the refractive index of the aqueous. The method was tested with a model of anterior chamber double-blindly and proved accurate and reliable. The average anterior chamber depth of 50 patients (100 eyes) measured by this method was 2.97 +/- 0.22 mm.
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1072
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Chadwick AV, Zhou W, Thomas JM. A New Oxygen Sensor Based on the Thermoelectric Power of Solid Solutions of Nb2O5 and Bi2O3. ACTA ACUST UNITED AC 1989. [DOI: 10.1002/anie.198900751] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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1073
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Chadwick AV, Zhou W, Thomas JM. Die Thermokraft fester Lösungen von Nb2O5 in Bi2O3 als Grundlage für einen neuen Sauerstoffsensor. Angew Chem Int Ed Engl 1989. [DOI: 10.1002/ange.19891010117] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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1074
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Wang HZ, Lu SH, Shen WX, Sun ZD, Zhou W, Wu YF, Zhou MR. Effect of A-nor steroids and oestradiol on progesterone production by human luteal cells. J Reprod Fertil 1988; 83:647-53. [PMID: 3411556 DOI: 10.1530/jrf.0.0830647] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Cell suspensions were prepared from human corpora lutea obtained during the mid-luteal phase. Progesterone production was assessed after short-term incubation of luteal cell suspensions. Luteal cells were very sensitive to hCG, the concentration required for 50% maximum response being 0.01 i.u./ml, and the response was 5 times higher than the basal production. Oestradiol (1-100 microM) induced a significant dose-related decrease in both basal and hCG-stimulated progesterone production. The A-nor steroidal compounds anordrin and AF-45 reduced hCG-stimulated progesterone production only at the high concentration of 100 microM. The ED50 values were approximately 3 microM, 75 microM and 100 microM for oestradiol, AF-45 and anordrin respectively. Anordrin showed no significant effects on basal progesterone production. In addition, oestradiol markedly inhibited the activity of 3 beta-hydroxysteroid dehydrogenase in luteal cells, expressed by the conversion of pregnenolone to progesterone, but the inhibitory effects of anordrin and AF-45 were negligible or relatively low. The effects of anordrin and AF-45 were different from those of oestradiol on progesterone production by human luteal cells in vitro, indicating that neither substance is likely to be a useful luteolytic agent in women.
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Affiliation(s)
- H Z Wang
- Shanghai Institute of Planned Parenthood Research, China
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1075
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Jiang WZ, Zhou W, Zhao YG, Li YM, Zheng GC, Meng WC, Zou BZ. Treatment of discogenic back and leg pain based on differentiation of symptom-complex according to traditional Chinese medicine. J TRADIT CHIN MED 1986; 6:267-72. [PMID: 2955173] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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