9326
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Chen Y, Sun CG, Sun GT, Li Y. [The dormancy types and characteristics of the seeds of medicinal plants]. YAO XUE XUE BAO = ACTA PHARMACEUTICA SINICA 1984; 19:69-75. [PMID: 6464770] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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9327
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Li Y. [The discovery of paragonimiasis in Fujian Province] (Chi). ZHONGHUA YI SHI ZA ZHI (BEIJING, CHINA : 1980) 1984; 14:19-24. [PMID: 11611489] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/21/2023]
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9328
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Ding XJ, Li Y, Ding Y, Yang HZ. Chromosome changes in patients with chronic benzene poisoning. Chin Med J (Engl) 1983; 96:681-5. [PMID: 6418466] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
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9329
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Xu PP, Ren ZL, Li Y, Lu ML, Li D, Xu H, Zhao MX. [Determination of praziquantel in rabbit plasma and its pharmacokinetic parameters by high performance liquid chromatography (HPLC)]. YAO XUE XUE BAO = ACTA PHARMACEUTICA SINICA 1983; 18:401-5. [PMID: 6659938] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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9330
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Shimizu K, Goldfarb M, Suard Y, Perucho M, Li Y, Kamata T, Feramisco J, Stavnezer E, Fogh J, Wigler MH. Three human transforming genes are related to the viral ras oncogenes. Proc Natl Acad Sci U S A 1983; 80:2112-6. [PMID: 6572964 PMCID: PMC393767 DOI: 10.1073/pnas.80.8.2112] [Citation(s) in RCA: 238] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
Abstract
Three distinct transforming genes present in human tumor cell lines are all related to the viral oncogenes of Harvey and Kirsten murine sarcoma viruses, designated v-H-ras and v-K-ras, respectively. The transforming gene of a bladder carcinoma cell line has been shown to be a human homolog to v-H-ras [Parada, L. F., Tabin, C. J., Shih, C. & Weinberg, R. A. (1982) Nature (London) 297, 474-478; Santos, E., Tronick, S. R., Aaronson, S. A., Pulciani, S. & Barbacid, M. (1982) Nature (London) 298, 343-347]. The transforming gene common to one colon (SK-CO-1) and two lung carcinoma (SK-LU-1 and Calu-1) cell lines is the same human homolog of v-K-ras as is the transforming gene previously identified in a lung carcinoma cell line Lx-1 [Der, C. J., Krontiris, T. G. & Cooper, G. M. (1982) Proc. Natl. Acad. Sci. USA 79, 3637-3640]. The transforming gene of SK-N-SH neuroblastoma cells is weakly homologous to both v-H-ras and v-K-ras. NIH 3T3 cells transformed with the SK-N-SH transforming gene contain increased levels of a protein serologically and structurally related to the protein products of the v-H-ras and v-K-ras genes. Therefore, it represents a third member of the ras gene family, which we have called N-ras. Based on the homology with the v-ras genes, we have established the orientation of transcription and approximate coding regions of the cloned human K-ras and N-ras genes.
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9331
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Li Y. [The center of gravity of China's population and its moving locus]. REN KOU YAN JIU = RENKOU YANJIU 1983:28-32. [PMID: 12312935] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/19/2023]
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9332
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Hou YD, Zhang ZQ, Yang XK, Mu SH, Li YY, Peng JZ, Li Y, Yang CT, Fu QL, Hu YW. [Cloning of alpha interferon cDNA from human umbilical cord leukocytes and its expression in Escherichia coli]. ZHONGGUO YI XUE KE XUE YUAN XUE BAO. ACTA ACADEMIAE MEDICINAE SINICAE 1982; 4:327-35. [PMID: 6221811] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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9333
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Thomas GJ, Li Y, Fuller MT, King J. Structural studies of P22 phage, precursor particles, and proteins by laser Raman spectroscopy. Biochemistry 1982; 21:3866-78. [PMID: 7138810 DOI: 10.1021/bi00259a023] [Citation(s) in RCA: 29] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
For the study of the protein--protein and protein--nucleic acid interactions in the assembly of virus particles, laser Raman spectra have been obtained in H2O and D2O solutions and as a function of temperature for the following Salmonella phage P22 components: mature phage particles, isolated mature phage DNA, mature protein shells empty of DNA, precursor protein shells (procapsids), and purified coat, scaffolding and tail-spike proteins. The spectra confirm that the condensed DNA within the phage capsid assumes the B-form secondary structure similar to aqueous DNA and reveal no evidence of specific molecular interactions between subgroups of DNA and protein subunits of the phage capsid. No differences were detected in the highly irregular secondary structure of the major capsid protein in mature capsids, empty capsids (lacking DNA), procapsids, and empty procapsids (lacking scaffolding protein). Features of both primary and secondary structures of the viral scaffolding and tail-spike proteins are also revealed by the spectra. Differences in thermal stability of tyrosyl side-chain interactions were observed between scaffolding protein extracted from the procapsid and within the procapsid. These differences correspond to different hydrogen bonding configurations of p-hydroxyphenyl groups and provide indirect evidence for the participation of the scaffolding proteins in specific macromolecular interactions within the procapsid.
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9334
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Falco SC, Li Y, Broach JR, Botstein D. Genetic properties of chromosomally integrated 2 mu plasmid DNA in yeast. Cell 1982; 29:573-84. [PMID: 6288264 DOI: 10.1016/0092-8674(82)90173-8] [Citation(s) in RCA: 103] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
We obtained strains of yeast with large segments of 2 mu plasmid DNA integrated at several chromosomal locations by selecting genetically for recombination between a chromosomal sequence carried on a 2 mu-circle-containing hybrid plasmid and a homologous sequence on the chromosome. In all diploids examined, the presence of 2 mu circle sequences causes a marked instability of the chromosome into which the 2 mu DNA is inserted. Although in some cases the loss of genetic markers is due to physical loss of the entire chromosome, in most cases the loss of markers appears to be due to a mitotic homozygotization of markers: the allelic information from the homologous chromosome replaces the information distal to the integrated 2 mu DNA. The instability caused by integrated 2 mu DNA sequences requires the activity of the specialized site-specific recombination system encoded by the 2 mu plasmid. We propose that the presence of integrated 2 mu DNA allows efficient integration of additional copies of the intact 2 mu plasmid by the action of the plasmid-coded special recombination system. Unequal sister-strand exchanges within the inverted repetition would result in the formation of dicentric chromosomes whose breakage during mitosis might begin a cycle analogous to the breakage-fusion-bridge cycle described many years ago in maize.
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9335
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Li Y, Wolf E. Radiation from anisotropic Gaussian Schell-model sources. OPTICS LETTERS 1982; 7:256-258. [PMID: 19710891 DOI: 10.1364/ol.7.000256] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Expressions are derived for the radiant intensity generated by a planar, anisotropic, Gaussian, Schell-model source of any state of coherence. It is found that with an appropriate choice of the source parameters the radiant intensity may be rotationally symmetric about the source plane and may even become identical with the radiant intensity produced by a completely coherent and rotationally symmetric laser source.
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9336
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Li Y. [Preliminary study on the antihypoxemic action of San-Gou-Liang (Sorbaria sorbiforia)]. ZHONG YAO TONG BAO (BEIJING, CHINA : 1981) 1982; 7:34-5. [PMID: 6215158] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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9337
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Li Y, De Vries S, Leonard K, Weiss H. Topography of the iron-sulphur subunit in mitochondrial ubiquinol:cytochrome c reductase. FEBS Lett 1981; 135:277-80. [PMID: 6274694 DOI: 10.1016/0014-5793(81)80800-9] [Citation(s) in RCA: 58] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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9338
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Miki K, Li Y, Yukawa M, Owatari A, Kai Y, Tanaka N, Kasai N, Hata Y, Kakudo M, Katsube Y, Kawabe K, Yoshida Z, Ogoshi H, Takano T. X-ray crystal structure analyses of myoglobins reconstituted with synthetic hemes. Acta Crystallogr A 1981. [DOI: 10.1107/s0108767381098772] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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9339
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Li SC, Asakawa M, Hirabayashi Y, Li Y. Isolation of two endo-beta-N-acetylglucosaminidases from fig latex. BIOCHIMICA ET BIOPHYSICA ACTA 1981; 660:278-83. [PMID: 6793075 DOI: 10.1016/0005-2744(81)90171-6] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Two endo-beta-N-acetylglucosaminidases (mannosyl-glycoprotein 1,4-N-acetamidodeoxy-beta-D-glycohydrolase, EC 3.2.1.96) (type F-I and type F-II) have been isolated from fig latex. At pH 7.0, type F-1 was retained by the DEAE-Sephadex A-50 column, whereas type F-II was not adsorbed by the column. The optimum pH of type F-I was found to be pH 5.9 and type F-II, pH 5.4. Type F-I enzyme hydrolyzes the tri-mannosyl derivatives di-N-acetylglucosaminylasparagine faster than the penta- or hexa-mannosyl compounds. Type F-II hydrolyzes the penta- and hexa-mannosyl derivatives, but not the tri-mannosyl compound.
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9340
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Li Y. Method of successive approximations for calculating the eigenvalues of optical thin-film waveguides. APPLIED OPTICS 1981; 20:2595-2597. [PMID: 20332999 DOI: 10.1364/ao.20.002595] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
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9341
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Li Y, Yu PL, Chen YX, Li LQ, Gai YZ, Wang DS, Zheng YP. [Studies on analogs of artemisinine. I. The synthesis of ethers, carboxylic esters and carbonates of dihydroartemisinine (author's transl)]. YAO XUE XUE BAO = ACTA PHARMACEUTICA SINICA 1981; 16:429-39. [PMID: 7270170] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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9342
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Zhang RB, Xu SL, Li Y. [Separation of artemisinine and its derivatives by reversed phase high performance liquid chromatography (author's transl)]. YAO XUE XUE BAO = ACTA PHARMACEUTICA SINICA 1981; 16:460-5. [PMID: 7270174] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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9343
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Li Y, Leonard K, Weiss H. Membrane-bound and water-soluble cytochrome c1 from Neurospora mitochondria. EUROPEAN JOURNAL OF BIOCHEMISTRY 1981; 116:199-205. [PMID: 6265210 DOI: 10.1111/j.1432-1033.1981.tb05319.x] [Citation(s) in RCA: 69] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Cytochrome c1 is a subunit of ubiquinol--cytochrome c reductase (EC 1.10.2.2). In Neurospora crassa wild type 74A grown in the presence of chloramphenicol, the subunit is inserted only into the bilayer of the mitochondrial inner membranes without associating with other proteins. From these modified membranes a monodisperse (cytochrome c1)-Triton complex was isolated by subjecting the Triton-solubilized membranes to affinity chromatography on immobilized cytochrome c. A water-soluble pentamer of cytochrome c1 was prepared from the (cytochrome c1)-Triton complex by removing the detergent. By limited proteolytic digestion of the cytochrome c1-Triton complex with chymotrypsin, a water-soluble monomeric cytochrome c1 was prepared which has a molecular weight of only 24 000 as compared to 31 000 of the membrane-bound cytochrome c1. The 24 000-Mr cytochrome c1 and the 31 000-Mr cytochrome c1 have same light absorption spectra and cytochrome-c-binding properties. These results are used to propose the following model. Cytochrome c1 consists of a large hydrophilic part and a small hydrophobic part. The hydrophilic part extends from the mitochondrial inner membrane into the intermembrane space. This part carries the heme and interacts with cytochrome c. The hydrophobic part anchors the cytochrome c1 to the bilayer.
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9344
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Li Y. [A report of 8 cases of poisoning with Nassarius succinctus (author's transl)]. ZHONGHUA NEI KE ZA ZHI 1981; 20:231-2. [PMID: 7307748] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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9345
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Pestka JJ, Li Y, Harder WO, Chu FS. Comparison of radioimmunoassay and enzyme-linked immunosorbent assay for determining aflatoxin M1 in milk. JOURNAL - ASSOCIATION OF OFFICIAL ANALYTICAL CHEMISTS 1981; 64:294-301. [PMID: 6785270] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Using a highly specific antibody against aflatoxin M1, a radioimmunoassay (RIA) and an enzyme-linked immunosorbent assay (ELISA) were developed for the quantitation of M1 in milk. RIA was sensitive in the range of 5-50 ng per assay but was subject to interference by whole milk. Extraction and cleanup were therefore necessary for the detection of M1 in milk at 0.5 ng/mL. An ELISA procedure was developed by using an aflatoxin M1-carboxymethyl-horseradish peroxidase conjugate as the ligand. Competitive assays revealed that this system was relatively more sensitive for M1 than for B1, and had a much lower degree of cross-reactivity for aflatoxins B2, G1, G2, B2a, and aflatoxicol. As low as 0.25 ng M1/mL in artificially contaminated milk (raw, whole, skim) could be detected by ELISA in 3 h without extraction or cleanup. Because of its simplicity, sensitivity, and specificity, ELISA is the preferred method for monitoring aflatoxin M1 in milk.
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9346
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Li YY, Liu XY, Shi LY, Li Y, Hou YD. [Induction characteristic of lymphoblastoid interferon (author's transl)]. ZHONGGUO YI XUE KE XUE YUAN XUE BAO. ACTA ACADEMIAE MEDICINAE SINICAE 1980; 2:250-3. [PMID: 6171357] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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9347
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Li Y. [Cardiac muscle mechanics in the evaluation of myocardial contractility]. SHENG LI KE XUE JIN ZHAN [PROGRESS IN PHYSIOLOGY] 1980; 11:212-9. [PMID: 7268374] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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9348
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Xu XY, Li Y, Xu J. [A modified humoral immune assay method--a method of hemolysin determination (author's transl)]. YAO XUE XUE BAO = ACTA PHARMACEUTICA SINICA 1979; 14:443-6. [PMID: 93846] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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9349
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King TP, Li Y, Kochoumian L. Preparation of protein conjugates via intermolecular disulfide bond formation. Biochemistry 1978; 17:1499-506. [PMID: 646998 DOI: 10.1021/bi00601a022] [Citation(s) in RCA: 82] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Conjugates of two unlike proteins can be prepared via the intermolecular disulfide interchange reaction, namely, protein A containing thiol groups reacts with protein B containing 4-dithiopyridyl groups to yield a conjugate with the release of 4-thiopyridone. Thiol groups can be introduced into proteins upon amidination with methyl 3-mercaptopropionimidate ester or 2-iminothiolane, and 4-dithiopyridyl groups can be introduced into proteins with these same reagents in the presence of 4,4'-dithiodipyridine. 2-Iminothiolane is stable on storage in contrast to the known lability of imidate esters; therefore 2-iminothiolane is a more convenient reagent for the modification of protein than are the imidate esters. All the reactions can be carried out easily under mild conditions in good yields. Conjugates of bovine plasma albumin with itself, ribonuclease, or a copolymer of D-glutamic acid and D-lysine and of sheep antibody and horseradish peroxidase were prepared with modified proteins containing an average of 1 to 5 thiol or dithiopyridyl groups per mol. These conjugates formed mainly dimers, trimers, and tetramers. The peroxidase labeled antibody retained more than 80% of its enzymatic and antigenic binding activities.
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9350
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Li Y, Chung DY. The anisotropic behavior of Poisson's ratio, Young's modulus, and shear modulus in crystals with different symmetries. ACTA ACUST UNITED AC 1978. [DOI: 10.1002/pssa.2210460225] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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