8751
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Li J, Huang WJ. [Effects of artesunate, pyronaridine and hydroxypiperaquine on chloroquine-sensitive and chloroquine-resistant isolates of Plasmodium falciparum in vitro]. Zhongguo Yao Li Xue Bao 1988; 9:83-6. [PMID: 3055815] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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8752
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Qiu YY, Tang ZD, Xia ZQ, Dai TC, Hu YE, Li J, Lu YJ, Zhang NL. Diagnostic value of C-13-methacetin breath test in liver diseases. Chin Med J (Engl) 1988; 101:37-41. [PMID: 3142730] [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: 01/04/2023] Open
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8753
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Dong YL, Zhu ZM, Li J. [Copper and zinc content of the serum of burned patients]. Zhonghua Wai Ke Za Zhi 1988; 26:34-6, 61-2. [PMID: 3197537] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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8754
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Affiliation(s)
- T J Kelly
- Department of Molecular Biology and Genetics, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205
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8755
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Qiao WJ, Li Y, Bi YS, Li J. Studies on the determination of blood lead by neopolarographic anodic stripping voltammetry. J Tongji Med Univ 1987; 7:248-51. [PMID: 3448253 DOI: 10.1007/bf02888452] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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8756
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Wu QC, Huang YZ, Gao RL, Li J. [Surgical treatment in the cases of complicated retinal detachment]. Yan Ke Xue Bao 1987; 3:254-8. [PMID: 3508422] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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8757
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Abstract
The N gene transcriptional antitermination protein of bacteriophage lambda is incorporated in vitro into transcriptional elongation complexes containing the E. coli proteins NusA and NusB. The binding of NusA to elongating RNA polymerase is sequence-independent and follows the release of sigma 70. Incorporation of N into the elongation complex requires an N utilization site (nut site) on the DNA template. Incorporation of NusB into the complex requires NusA, ribosomal protein S10, and the boxA component of the nut site. T1 RNAase releases N, but not NusB, from the elongation complex. We therefore propose that an N-modified termination-resistant elongation complex includes an elongation control particle (ECP) containing at least NusA, NusB, S10, N, and an RNA transcript of the nut site.
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Affiliation(s)
- R J Horwitz
- Banting and Best Department of Medical Research, Charles H. Best Institute, Toronto, Canada
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8758
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Dai YC, Hu GZ, Niu HY, Wen Z, Fang Z, Lu XG, Li J, Wu Q, Huang YP, Wen R. Formation of lymphocyte colonies under serum-free culture conditions in normal individuals and patients with chronic lymphocytic leukemia. Int J Cell Cloning 1987; 5:480-91. [PMID: 3123561 DOI: 10.1002/stem.5530050606] [Citation(s) in RCA: 3] [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: 01/04/2023]
Abstract
This paper describes a culture system which supports the formation of B cell and some T cell colonies under serum-free conditions in peripheral blood samples of normal individuals and patients with chronic lymphocytic leukemia (CLL) of B cell type. In this system, serum is replaced by bovine serum albumin, transferrin, cholesterol, insulin and catalase or horseradish peroxidase. In addition, it is necessary to add staphylococcus protein A, mitomycin-treated T cells as feeders and phytohemagglutinin leukocyte-conditioned medium as a source of growth factors. The plating efficiency is greatly enhanced when normal cells are incubated with galactose oxidase prior to plating and when CLL cells are exposed sequentially to neuraminidase and galactose oxidase.
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Affiliation(s)
- Y C Dai
- Jiangxi Institute of Medical Science, People's Republic of China
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8759
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Chen WP, Li J, Wu SL. [Clove (Eugenia aromatca Baillon)]. Zhong Yao Tong Bao 1987; 12:11-2, 61. [PMID: 3446376] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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8760
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Li J, Gong C, Holz A. Brillouin-Wigner theory of mixed-valence rare-earth impurities in Bardeen-Cooper-Schrieffer superconductors. Phys Rev B Condens Matter 1987; 36:5230-5239. [PMID: 9942157 DOI: 10.1103/physrevb.36.5230] [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] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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8761
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Li J, Wang LY. Electron microscopic observation of interaction between normal mononuclear cells and platelets from ITP children. J Tongji Med Univ 1987; 7:180-4. [PMID: 3448246 DOI: 10.1007/bf02888215] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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8762
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Cui HY, Zhang W, Li J, Liu BY, Li JS, Lin YC, Zhang WH, Wu AR, Liu ZM. [Preliminary study on the nucleic acid hybridization technic in detecting HSV-2 DNA corresponding sequence of cancer tissues of the uterine cervix]. Zhonghua Zhong Liu Za Zhi 1987; 9:342-4. [PMID: 2838236] [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: 01/02/2023]
Abstract
In this paper, 34 samples, 25 from 18 cervical carcinoma patients and 9 from 8 non-cervical carcinoma patients, were assayed using (alpha-32P) dCTP HSV-2 DNA probe and nucleic acid hybridization technic. It was shown that the positive rates of HSV-2 DNA corresponding sequence were 50% (2/4), 36% (5/14) and 12% (1/8) in the in situ cancer, invasive cancer and non-cervical cancer tissues. No HSV was isolated from 7 cancer specimens which showed a positive reaction by nucleic acid hybridization.
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Affiliation(s)
- H Y Cui
- Cancer Institute and Hospital, Chinese Academy of Medical Sciences, Beijing
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8763
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Vaziri N, Yousefi S, Chiu J, Li J, Carandang G, Stephenson J, Cesario T. Reversal of the effects of cyclosporin A on the production of human interferon-gamma. J Interferon Res 1987; 7:389-95. [PMID: 3117907 DOI: 10.1089/jir.1987.7.389] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Previous reports have documented that cyclosporin A (CsA) can inhibit the production of interferon-gamma (HuIFN-gamma) and interleukin-2 (IL-2). In this report we have extended these earlier findings and have demonstrated that the defect in the production of HuIFN-gamma persists even after the CsA is removed and is associated with altered synthesis of other lymphokines, mainly a cytotoxin and leukocyte migration inhibition factor. In the presence of recombinant exogenous IL-2, the effect of CsA on the synthesis of HuIFN-gamma can be reversed depending on the concentrations of both the IL-2 and CsA. In addition, the presence of the calcium ionophore A23187 partially reverses the inhibitory effect of CsA by synergistically enhancing the synthesis of HuIFN-gamma.
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Affiliation(s)
- N Vaziri
- Department of Medicine, University of California, Irvine
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8764
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Dai GZ, Sun MS, Liu SQ, Ding XF, Chen YD, Wang LC, Du DP, Zhao G, Su Y, Li J. First report of an epidemic of diarrhoea in human neonates involving the new rotavirus and biological characteristics of the epidemic virus strain (KMB/R85). J Med Virol 1987; 22:365-73. [PMID: 3040899 DOI: 10.1002/jmv.1890220409] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
An outbreak of diarrhoea in neonates occurred at the nurseries of the Department of Obstetrics of Zhao Tong Regional Hospital, Yunnan Province, from the middle of August to the end of November, 1985. Fifty-one percent of children were affected 2-8 days after birth. The clinical symptoms were mild; patients mainly had diarrhoea and did not vomit. Rotaviruses were detected in 66.7% by RNA PAGE and in 72.7% by EM. The virus strain designated as KMB/R85 had a typical morphology, which was indistinguishable from that of infantile rotaviruses by EM. The viral RNA genome was composed of 11 segments. The buoyant density in CsCl was 1.377 g/cm3. The KMB/R85 strain possessed a hemagglutinin for rhesus monkey erythrocytes. By ELISA, IEM, and HAI, it was found that KMB/R85 strain did not possess the common group antigen shared by group A rotaviruses and was antigenically similar to the Chinese adult diarrhoea rotavirus (serogroup B).
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8765
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Abstract
The Escherichia coli lactose permease has been purified on cation exchanger to contain a minimal amount of phospholipids, i.e., 4-5 mol/mol of permease, in the presence of the detergent dodecyl beta-maltoside at its critical micelle concentration. This preparation is active in galactoside binding. When the detergent level is further reduced by dialysis, the lactose permease forms filaments one molecule wide and up to several micrometers long. The filaments tend to associate laterally to form sheets. Analysis of electron micrographs of negatively stained filamentous arrays indicates an average filament spacing of 51 A and a subunit period of 26-30 A along individual filaments. These values most probably correspond to the dimensions of the lactose permease molecule measured parallel to the membrane plane. In many filaments, the subunits show a stain-penetrated cleft. It suggests that the lactose permease molecule comprises two domains, which may be correlated with internal repeats between the N- and C-terminal halves of the polypeptide sequence.
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Affiliation(s)
- J Li
- MRC Laboratory of Molecular Biology, Cambridge, England
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8766
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Long YL, Luo HC, Wei FR, Li J, Li P. [An investigation of psoriasis in Chengdu and Deyang]. Hua Xi Yi Ke Da Xue Xue Bao 1987; 18:175-8. [PMID: 3623546] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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8767
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Li J, Wen JC, Su S. [Incorporation of thymic peptide in the combined treatment of severe subacute hepatitis]. Zhonghua Nei Ke Za Zhi 1987; 26:223-4, 256. [PMID: 3652824] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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8768
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Pan XR, Hu SX, Gang Y, Jin L, Li XG, Li J, Yan Q, Chen TS. Lipoprotein and apoprotein A1 levels in diabetics and coronary heart disease patients and controls. Chin Med J (Engl) 1987; 100:204-7. [PMID: 3113842] [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: 01/04/2023] Open
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8769
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Li J. [A checking-up survey of 2 counties of north part of Guangdong Province concerning the eradication of poliomyelitis]. Zhonghua Liu Xing Bing Xue Za Zhi 1987; 8:37-9. [PMID: 3621318] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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8770
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Abstract
Persistence and extinction attributes of a discrete population model are explored on both a finite and an infinite time horizon. For a first-order autonomous nonlinear difference equation, a classification is found of when, for each positive integer N, trajectories go to extinction at time N. The dynamic complexity that is known to permeate difference-equation models is also present in the survival analyses developed here. Also found is an interesting decomposition of the continuum of initial population sizes into intervals where populations are persistent at time N and intervals leading to extinction at time n less than or equal to N.
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Affiliation(s)
- J Li
- Department of Mathematics, University of Tennessee, Knoxville 37996-1300
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8771
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Li J, Wang LY. [Electron microscopy observations on platelet and normal mononuclear reactions in children with idiopathic thrombopenic purpura]. Zhonghua Yi Xue Za Zhi 1987; 67:31-3. [PMID: 3109703] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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8772
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Li J, Yousefi S, Sterling M, Carandang G, Vaziri N, Pahl M, Cesario T. The effect of corticosteroids and other antineoplastic agents on the generation of leukocyte migration inhibition factor. J Clin Lab Immunol 1987; 22:13-7. [PMID: 3104595] [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: 01/04/2023]
Abstract
We have shown that hydrocortisone in physiological concentrations can inhibit the production of leukocyte migration inhibition factor (LMIF), but does not diminish the action of this lymphokine. Other agents tested failed to influence LMIF production. Inhibition of LMIF production by corticosteroids was influenced by the nature of the stimulus used for the production as an effect could be seen with PHA or Con A, but not Staphylococcal enterotoxin A (SEA). Production of LMIF was promptly restored after removal of the steroids. Furthermore, addition of a calcium ionophore to PHA restored the production of LMIF even in the presence of corticosteroids. In contrast, addition of exogenous IL-2 did not correct the defect in lymphokine secretion. We believe that inhibition of the production of LMIF by steroid may lead to defective granulocytic function and thus, predispose to infection.
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8773
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Li J. [Cell transformation by an organic extract of an air-borne particulate]. Zhonghua Yu Fang Yi Xue Za Zhi 1986; 20:340-3. [PMID: 2436863] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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8774
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8775
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Li J. [Chen Bangxian, a renowned Chinese medical historian] (Chi). Zhonghua Yi Shi Za Zhi 1986; 16:193-8. [PMID: 11621234] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/17/2023]
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8776
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Eddy JL, Li J. Chemotherapy administration precaution. Oncol Nurs Forum 1986; 13:9. [PMID: 3632865] [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: 01/06/2023]
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8777
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8778
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Cao YY, Yang XX, Li J, Ren LP, Lin WH, Guo YN, Lu ZW, Li JF. [Study on the etiology of hand, foot and mouth disease (HFMD) in China]. Zhongguo Yi Xue Ke Xue Yuan Xue Bao 1985; 7:333-6. [PMID: 3009033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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8779
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8780
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Su YH, Li J. [Scanning electron microscopy studies on the mechanisms of the deposition and elimination of lipids in the early stages of experimental atherosclerosis]. Zhonghua Xin Xue Guan Bing Za Zhi 1985; 13:183-6, 239. [PMID: 4092598] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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8781
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Cai LW, Wang N, Jiang W, Xu QX, Li J, Liang J, Liang ZQ, Xie YB, Wang JZ. [Cloning of Adr HBV genome and its surface antigen gene]. Zhongguo Yi Xue Ke Xue Yuan Xue Bao 1984; 6:252-5. [PMID: 6241061] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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8782
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8783
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8784
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Li J. [Ultrastructural observation of blood platelets in experimental atherosclerosis]. Zhonghua Xin Xue Guan Bing Za Zhi 1984; 12:55-8. [PMID: 6745073] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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8785
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Li J. [On the relationship between population and means of subsistence]. Renkou Yanjiu 1984:8-14. [PMID: 12313033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/19/2023]
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8786
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He YJ, Zhang L, Liu Y, Chen HY, Lu RK, Li J, Zhang QT, Min QC, Xu ZQ. [Endocrine changes in 28 young patients with schistosomiasis dwarfism]. Ji Sheng Chong Xue Yu Ji Sheng Chong Bing Za Zhi 1984; 2:150-153. [PMID: 6391724] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
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8787
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Li J, Calnek BW, Schat KA, Graham DL. Pathogenesis of reticuloendotheliosis virus infection in ducks. Avian Dis 1983; 27:1090-105. [PMID: 6316895] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
A new isolate of reticuloendotheliosis virus (REV) from ducks, RU-1, was used to experimentally infect white pekin ducks. Embryonal or neonatal infection usually resulted in persistent viremias, no REV antibody development, and inability to mount antibody responses against bovine serum albumin (BSA) or sheep red blood cells (SRBC). In contrast, infection at 21 days of age resulted in transient viremias, which terminated coincident with REV antibody development. These ducks remained persistently infected, however, based on virus isolations from peripheral blood lymphocytes. Ducks infected at that age were immunologically competent against BSA and SRBC unless they had been embryonally bursectomized, in which case they behaved virologically and immunologically like those infected at an early age. Bursectomy by itself did not prevent responses against the antigens. Total mortality during 4- or 6-month experimental periods ranged from 80 to 100% in REV-infected groups, regardless of age at infection, route of exposure, or whether the ducks were intact or bursectomized. Most deaths were from non-neoplastic conditions (stunting, bacterial infections), but 17 of 69 (25%) infected ducks developed a variety of neoplasms, including lymphosarcomas, histiocytic sarcomas, and spindle-cell sarcomas.
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8788
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Li J. [Studying Marx's discussion on the position and role of population in social and economic development]. Renkou Yanjiu 1983:39-46. [PMID: 12313011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/19/2023]
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8789
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Abstract
We have examined the reduction of cyanide by using the purified component proteins of nitrogenase (Av1 and Av2). The previously reported self-inhibition phenomenon was found to be an artifact. One of the two species present in cyanide solutions, CN-, was shown to be a potent reversible inhibitor (Ki = 27 microM) of total electron flow, apparently uncoupling MgATP hydrolysis and electron transfer. There appears to be no differential effect of CN- on the specific activities of Av1 and Av2 nor is there any apparent irreversible physical damage to Av2. CN- inhibition is completely reversed by low levels of CO, implying a common binding site. Azide partially relieves the inhibitory effect, but other substrates and inhibitors (N2, C2H2, N2O, H2) have no effect. The other species present in cyanide solutions, HCN, was shown to be the substrate (Km = 4.5 mM at Av2/Av1 = 8), and extrapolation of the data indicates that at high enough HCN concentration H2 evolution can be eliminated. The products are methane plus ammonia (six electrons), and methylamine (four electrons). There is an excess (relative to methane) of ammonia formed, which, according to electron balance studies, may arise from a two-electron intermediate. Both nitrous oxide and acetylene (but not N2) influence the distribution of cyanide reduction products, implying simultaneous binding. HCN appears to bind to and be reduced at an enzyme state more oxidized than the one responsible for either H2 evolution or N2 reduction.
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8790
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McAdam KP, Li J, Knowles J, Foss NT, Dinarello CA, Rosenwasser LJ, Selinger MJ, Kaplan MM, Goodman R, Herbert PN, Bausserman LL, Nadler LM. The biology of SAA: identification of the inducer, in vitro synthesis, and heterogeneity demonstrated with monoclonal antibodies. Ann N Y Acad Sci 1982; 389:126-36. [PMID: 6807176 DOI: 10.1111/j.1749-6632.1982.tb22131.x] [Citation(s) in RCA: 74] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Continued studies of the macrophage-derived mediator of SAA synthesis (SAA Stimulating Factor) confirm our previous observations that SAASF copurified with leukocytic pyrogen (LP) and lymphocyte activating factor (LAF). Moreover, new data demonstrate three separate isoelectric points for human LP-LAF-SAASF each of which possess the three biological activities. During the purification of 15,000 MW LP from crude stimulated mononuclear cell supernatants, only those fractions with pyrogenic activity in rabbits caused augmented stimulation of lymphocytes (LAF) and induced SAA synthesis in mice. Purified human LP stimulated isolated mouse hepatocytes in vitro to synthesize SAA in a dose-responsive manner. Colchicine treatment of hepatocytes led to decreased secretion of SAA into the medium and to an intracellular accumulation of SAA. Messenger RNA was isolated from the livers of endotoxin-stimulated mice and translated in a wheat-germ cell-free system. A major product was identified at 13-14,000 MW. Immunoprecipitation with anti-mouse AA identified several bands on autoradiography of polyacrylamide gels. These larger SAA precursors may account for the previously noted heterogeneity of human SAA, comprising at least 6 SAA isomers, of similar molecular weight but different solubility and electrophoretic charge characteristics. Two monoclonal antibodies (IgM-K and IgG1-K) have been prepared using standard cell hybridization techniques. They are directed at the variable COOH terminal region of SAA since they detect differences between the 6 human SAAs but do not react with human, monkey, dog or mouse AA proteins, human AP, C-reactive protein, IgG nor albumin. These antibodies will be useful in examining the origin, structure and function of SAA.
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8791
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Greenblatt J, Li J. Properties of the N gene transcription antitermination protein of bacteriophage lambda. J Biol Chem 1982; 257:362-5. [PMID: 6458615] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
Abstract
The product of the N gene of bacteriophage lambda prevents the termination of lambda early transcription. Here we describe the physical properties of pure lambda N protein. N protein is small and very basic. The apparent Mr of N protein during electrophoresis in the presence of sodium dodecyl sulfate is 12,500. It contains 22 mol % (arginine plus lysine) and only one methionine. The methionine residue is at the blocked NH2 terminal since N protein is not detectably shortened by reaction with cyanogen bromide. When use is made of the DNA sequence of the N gene region of lambda DNA (Franklin, N. C., and Bennett, G. N. (1979) Gene 8, 107-119), the lack of an internal methionine residue, the size, and the amino acid composition of N protein can be used to predict that N protein contains 107 amino acids (calculated Mr = 12,241) and that its coding sequence begins at position 223 of the lambda pL operon mRNA. N protein can be assayed by its ability to stimulate endolysin synthesis in vitro in a reaction programmed with lambda N- DNA. N protein activity is heat-stable and trypsin-sensitive. Its sedimentation velocity in a sucrose gradient and its Stokes' radius indicate that N protein is an extremely asymmetric monomer (f/fmin = 1.6). The relationship between this high degree of molecular asymmetry and the sequence which N protein must recognize in lambda nucleic acid is discussed.
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8792
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Abstract
The structure of the major protein constituent of photosynthetic membranes in higher plants, the chlorophyll a/b-light harvesting complex (LHC), was studied by x-ray diffraction and electron microscopy. The LHC was purified from Triton X-100 solubilized thylakoid membranes of the pea, and contained 6 mol of chlorophylls a and b per mole of a polypeptide of 27,000 molecular weight. X-ray diffraction showed that in the presence of 10 mM MgCl2, purified LHC forms planar aggregates that stack with a period of 51 A. Within each layer, LHC molecules pack with a center-to-center distance of 85 A but without long-range order. However, when LHC is incorporated into single-walled vesicles of plant lecithin, the addition of NaCl above 10 mM, or MgCl2 above 2 mM, led to the formation of plaques of hexagonal lattices, with a lattice constant of 125 A. The large domain size and high degree of order in the plane of the membrane are evident from the sharp lattice lines observed to 7 A resolution on the equator of the x-ray pattern. Freeze-fracture electron micrographs demonstrated an aligned stacking of the lattices in adjacent membranes, resulting in crystallinity in the third dimension over short distances. Micrographs of negatively stained membranes revealed a hexagonal lattice of the same lattice constant, formed by surface-exposed parts of the LHC molecules which are probably responsible for the ordered stacking of lattices. In both the LHC aggregates and in the reconstituted membrane lattices the diffracted x-ray intensities at 10-A spacing on the equator indicate that the LHC molecule contains paralled alpha-helices or beta-sheets that are oriented perpendicular to the planar arrays.
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8793
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Greenblatt J, Li J. Interaction of the sigma factor and the nusA gene protein of E. coli with RNA polymerase in the initiation-termination cycle of transcription. Cell 1981; 24:421-8. [PMID: 6263495 DOI: 10.1016/0092-8674(81)90332-9] [Citation(s) in RCA: 187] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
The nusA gene protein of E. coli is involved in regulating termination of transcription in vivo. In vitro it causes termination of transcription in the tR2 region of the PR operon of bacteriophage lambda. We have now used a nusA-Sepharose affinity column and gradient sedimentation experiments to show that the nusA protein binds directly, with great specificity, and with equimolar stoichiometry to the E. coli RNA polymerase core enzyme beta beta' alpha 2. The RNA polymerase sigma subunit is able to displace the nusA protein from a beta beta' alpha 2-nusA complex, regenerating RNA polymerase holoenzyme beta beta alpha 2-sigma able selectively to initiate transcription at promoter sites. It is proposed that beta beta' alpha 2-nusA and beta beta' alpha 2-sigma are complementary forms of RNA polymerase that interchange with one another in the initiation-termination cycle of transcription.
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8794
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Greenblatt J, Li J. The nusA gene protein of Escherichia coli. Its identification and a demonstration that it interacts with the gene N transcription anti-termination protein of bacteriophage lambda. J Mol Biol 1981; 147:11-23. [PMID: 6455533 DOI: 10.1016/0022-2836(81)90076-0] [Citation(s) in RCA: 101] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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8795
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Felsted RL, Li J, Pokrywka G, Egorin MJ, Spiegel J, Dale RM. Comparison of Phaseolus vulgaris cultivars on the basis of isolectin differences. Int J Biochem 1981; 13:549-57. [PMID: 7238987 DOI: 10.1016/0020-711x(81)90179-8] [Citation(s) in RCA: 30] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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8796
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Lin ZY, Kao YX, Li J, Chen WL, Xu GF. [Serum purpuric reaction in the diagnosis and mass survey of malignant tumor (author's transl)]. Zhonghua Zhong Liu Za Zhi 1980; 2:255-8. [PMID: 7297398] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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8797
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Hennessy MB, Li J, Lowe EL, Levine S. Maternal behavior, pup vocalizations, and pup temperature changes following handling in mice of 2 inbred strains. Dev Psychobiol 1980; 13:573-84. [PMID: 7429018 DOI: 10.1002/dev.420130603] [Citation(s) in RCA: 50] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
A cross-fostering design was used to examine maternal behavior, pup vocalizations, and pup temperature changes following an infantile procedure in C57BL/6J (C) and A/J (A) mice. In Experiment I, maternal behavior of C and A mothers after infantile handling differed in a number of ways irrespective of the strain of the foster pups. In addition, A pups were retrieved faster but licked less than were C pups by mothers of both strains. Handling appeared to increase the probability that strain differences would occur in that no differences between the lines, in either the behavior of the mothers or the capacity of the pups to elicit maternal behavior, were found during observations made just prior to daily handling. These observations also revealed that mothers of both strains treated same-strain foster pups differently than they treated foster pups of another strain. In Experiment II, A pups were found to emit more ultrasound following handling than were C pups, suggesting that retrieval but not pup-licking was stimulated by ultrasonic signals. Measurement of pup temperature during and following the handling procedure showed that (1) strain differences in ultrasonic signaling were not related to strain differences in the degree of hypothermia experienced by the pups; (2) recovery of body temperature following handling was slow for pups of both strains, and depended to some degree on the strain of the pups' foster mother; and (3) development of thermoregulation occurred more rapidly in C than A pups.
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8798
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Abstract
Eighteen patients who underwent whole-body scintigraphy 24 and 48 hours after intravenous injection of 67Ga-citrate were evaluated retrospectively. At 24 hours, 7 of the 16 normal patients (44%) and both abnormal patients demonstrated significant pulmonary uptake. However, by 48 hours, only 2 normal patients (12%) remained positive, while both abnormal patients continued to show significant pulmonary activity. The authors conclude that 48-hour 67Ga images offer improved specificity and uncompromised sensitivty in patients with diffuse pulmonary disease.
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8799
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Greenblatt J, Li J, Adhya S, Friedman DI, Baron LS, Redfield B, Kung HF, Weissbach H. L factor that is required for beta-galactosidase synthesis is the nusA gene product involved in transcription termination. Proc Natl Acad Sci U S A 1980; 77:1991-4. [PMID: 6154941 PMCID: PMC348636 DOI: 10.1073/pnas.77.4.1991] [Citation(s) in RCA: 56] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
Abstract
The DNA-dependent in vitro synthesis of Escherichia coli beta-galactosidase requires the presence of a soluble protein referred to as L factor [Kung, H., Spears, C. & Weissbach, H. (1975) J. Biol. Chem. 250, 1556-1562]. In the present study, comparison of physical, immunological, and biological properties shows that L factor is the product of the E. coli nusA gene. The nusA gene product is known to interact with bacteriophage lambda N gene protein and to prevent premature termination of transcription from the early lambda promoters. Our results suggest that premature transcription termination in the lac operon of E. coli may also be overcome by the nusA protein.
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8800
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Greenblatt J, Malnoe P, Li J. Purification of the gene N transcription anti-termination protein of bacteriophage lambda. J Biol Chem 1980; 255:1465-70. [PMID: 6444410] [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: 01/20/2023] Open
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