9301
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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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9302
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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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9303
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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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9304
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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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9305
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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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9306
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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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9307
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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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9308
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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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9309
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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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9310
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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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9311
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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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9312
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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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9313
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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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9314
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Lin C, Li Y, McGlotten J, Morton JB, Symchowicz S. Isolation and identification of the major metabolite of albuterol in human urine. DRUG METABOLISM AND DISPOSITION: THE BIOLOGICAL FATE OF CHEMICALS 1977; 5:234-8. [PMID: 17520] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The major urinary metabolite of albuterol in man was isolated and purified by ion-exchange chromatography and countercurrent distribution. On the basis of proton magnetic resonance, infrared, and mass-spectral analysis, enzymic hydrolysis, and assay of inorganic sulfate after acid hydrolysis, the metabolite has been identified as the 4'-O-sulfate ester of albuterol.
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9315
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Li Y. The anisotropic behavior of Poisson's ratio, Young's modulus, and shear modulus in hexagonal materials. ACTA ACUST UNITED AC 1976. [DOI: 10.1002/pssa.2210380119] [Citation(s) in RCA: 73] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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9316
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Chien S, Weinburg R, Li S, Li Y. Endo-beta-N-acetylglucosaminidase from fig latex. Biochem Biophys Res Commun 1976; 76:317-23. [PMID: 1027432 DOI: 10.1016/0006-291x(77)90727-6] [Citation(s) in RCA: 29] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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9317
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Li Y. Population growth and environmental problems in Taiwan (Formosa): a case-study. ENVIRONMENTAL CONSERVATION 1976; 3:171-178. [PMID: 12263289 DOI: 10.1017/s037689290001849x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Taiwan has the highest population density in the world today. The population growth-rate has been decreasing linearly since 1951, but the present growthrate of 2% is still much too high to lessen the population pressure. With the area of agricultural land severly limited, the agricultural sector of Taiwan can no longer absorb extra farm labourers without sacrificing the productivity of each farm labourer.In order to feed the growing population, the high productivity of a rice paddy has been maintained by applying ever-increasing amounts of chemical fertilizers and pesticides, which in turn cause many pollution problems. Moreover the rapid growth of industries, which are mainly financed by outside capital, causes the expansion and congestion of the cities along with all sorts of pollution problems (air pollution of cities, water pollution of rivers, harbours, coastal waters, etc.)The heavy dependence on imported energy (70% of the total energy consumption) and on trade with Japan and the United States, puts Taiwan in a vulnerable position with regard to fluctuations in the world economy. The ever-increasing population density, and the demands of a higher per caput consumption on the limited natural resources, risk leading to economic inadequacy and ecological degradation. Such a situation could endanger our industrial civilization more widely.
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9318
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9319
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Bennoun P, Li Y. New results on the mode of action of 3,-(3,4-Dichlorophenyl)-1,1-dimethylurea in spinach chloroplasts. BIOCHIMICA ET BIOPHYSICA ACTA 1973; 292:162-8. [PMID: 4705127 DOI: 10.1016/0005-2728(73)90260-0] [Citation(s) in RCA: 75] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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9320
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Anderson RE, Ishida K, Li Y, Ishimaru T, Nishiyama H. Geographic aspects of malignant lymphoma and multiple myeloma. Select comparisons involving Japan, England and the United States. THE AMERICAN JOURNAL OF PATHOLOGY 1970; 61:85-98. [PMID: 4922952 PMCID: PMC2047374] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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