601
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Chen JY, Hung MH. Detection of deoxyribonuclease activities of Mycoplasma pneumoniae. ZHONGHUA MINGUO WEI SHENG WU JI MIAN YI XUE ZA ZHI = CHINESE JOURNAL OF MICROBIOLOGY AND IMMUNOLOGY 1981; 14:19-26. [PMID: 6790244] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Alkaline deoxyribonuclease activity was detected in culture of Mycoplasma pneumoniae. This enzyme required MgCl2 to stimulate its activity and preferred double-stranded to single-stranded DNA as substrate. By using polyacrylamide gel electrophoresis or isoelectric electrofocusing, two distinctive deoxyribonuclease activities were demonstrated both in cultured broth and cell homogenate.
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602
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Cheng YC, Grill S, Derse D, Chen JY, Caradonna SJ, Connor K. Mode of action of phosphonoformate as an anti-herpes simplex virus agent. BIOCHIMICA ET BIOPHYSICA ACTA 1981; 652:90-8. [PMID: 6260189 DOI: 10.1016/0005-2787(81)90212-4] [Citation(s) in RCA: 28] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Phosphonoformate inhibited the replication of Herpes simplex virus (HSV) type 1 and type 2 in culture. The concentration required to inhibit the replication of both types of virus by 2 logs at 28 h post-infection was approximately 150 microM. It was more potent than phosphonoacetate against the growth of both virus types. A virus mutant which is resistant to phosphonoacetate was cross-resistant to phosphonoformate. Arsonoacetate, at 300 microM, had no antivirus activity. Phosphonoformate also inhibited HeLa and KB cell growth; at a concentration of about 500 microM, cell growth was inhibited by 50%. The anti-cell growth effects of the drug were completely reversible. The antivirus effect of phosphonoformate was partially reversible, depending on the time and duration of exposure of infected cultures to the drug. To obtain the maximum antivirus effect, phosphonoformate had to be added within the first 3 h post-virus-infection and be continuously present for at least 18 h. Phosphonoformate, added at 0 h post-infection, suppressed the induction of virus-specific DNA polymerase and DNAase activities. dTMP incorporation into DNA was preferentially inhibited in nuclei isolated from infected cells compared to uninfected cells, and the degree of inhibition varied with the ionic strength of the assay. Phosphonoformate was a potent inhibitor of the purified HSV-1 and HSV-2 DNA polymerases, inhibiting DNA polymerase activity by 50% at a concentration of 3 microM and ionic strength of 0.2.
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603
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Wang XF, Wei RF, Chen JY, Jiang DQ. [Studies on antitumor constituents of Maytenus confertiflorus J. Y. Luo et X. X. Chen. I. Isolation and characterization of the constituents from the leaves (author's transl)]. YAO XUE XUE BAO = ACTA PHARMACEUTICA SINICA 1981; 16:59-61. [PMID: 7246157] [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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604
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Cheng YC, Chen JY, Glaser R, Henle W. Frequency and levels of antibodies to Epstein-Barr virus-specific DNase are elevated in patients with nasopharyngeal carcinoma. Proc Natl Acad Sci U S A 1980; 77:6162-5. [PMID: 6255477 PMCID: PMC350234 DOI: 10.1073/pnas.77.10.6162] [Citation(s) in RCA: 73] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
Sera from healthy individuals and patients with infectious mononucleosis, Burkitt lymphoma, nasopharyngeal carcinoma, or other malignancies were examined for their capacity to neutralize Epstein-Barr virus (EBV)-induced DNase activity. Sera were found that neutralized the EBV DNase but not herpes simplex virus type 1 or type 2 DNases, and vice versa. Sera from 46 of the 49 patients with nasopharyngeal carcinoma examined (94%) neutralized > 6 units of EBV DNase per ml of serum. In contrast, only 19% of 47 patients with Burkitt lymphoma, 12% of 183 patient with other malignancies, 4% of 58 patients with infectious mononucleosis, and none of 101 healthy individuals had such levels of neutralizing activity. The neutralizing factor was found in the IgG fraction derived from nasopharyngeal carcinoma sera. There was no correlation between the concentration of these antibodie and the titers of IgG ad IgA antibodies to the EBV capsid antigen, the early antigen complex, or the EBV-associated nuclear antigen.
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605
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Cheng YC, Chen JY, Hoffmann PJ, Glaser R. Studies on the activity of DNase associated with the replication of the Epstein-Barr virus. Virology 1980; 100:334-8. [PMID: 6243430 DOI: 10.1016/0042-6822(80)90524-3] [Citation(s) in RCA: 47] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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606
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Taketa F, Matteson KJ, Chen JY, Libnoch JA. Methemoglobin reduction in red cells: effect of a high oxygen affinity hemoglobin. Blood 1980; 55:116-8. [PMID: 7350931] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
Abstract
Erythrocytes from heterozygous carriers of the high oxygen affinity mutant hemoglobin, Hb Wood, demonstrate lower rates of methemoglobin reduction than normal human red cells when incubated in the in vitro system of Beutler and Baluda. The rate of methemoglobin reduction in red cells from an individual who is heterozygous for both NADH-methoglobin reductase deficiency and Hb Wood shows the combined effects of the two mutations.
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607
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Taketa F, Antholine WE, Chen JY. Chain nonequivalence in binding of nitric oxide to hemoglobin. J Biol Chem 1978; 253:5448-51. [PMID: 209042] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
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608
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Jan IR, Chen JY, Lu FJ, Ling KH. Studies on fluorescent compounds in drinking water of blackfoot disease endemic areas. 4. The cytotoxic effects of fluorescent compounds on cell cultures. TAIWAN YI XUE HUI ZA ZHI. JOURNAL OF THE FORMOSAN MEDICAL ASSOCIATION 1978; 77:361-3. [PMID: 96210] [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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609
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Taketa F, Chen JY, Skogen WF, Litwin SB, Laver MB. Allosteric effect of o-iodobenzoate on hemoglobin. Hemoglobin 1978; 2:261-73. [PMID: 701084 DOI: 10.3109/03630267809007071] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
O-Iodobenzoate interacts non-covalently with hemoglobin and lowers the oxygen affinity of the protein. In contrast to 2,3-diphosphoglycerate or inositol hexaphosphate, its interaction does not depend upon the presence of free amino groups at the beta-chain amino terminals. Lysine beta82 is one of its oxygenation linked binding sites. As with the organic phosphates, the halogenated benzoate reacts preferentially with deoxy-hemoglobin to shift the allosteric equilibrium from R to T.
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610
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Abstract
The two major hemoglobins found in domestic cat blood occur within the same erythrocyte. A putative asymmetrical hybrid, alpha2betaAbetaB, is shown to be present in the cell by isoelectric focusing.
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611
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Chen JY, Lu FJ, Lin KH. Studies on fluorescent compounds in drinking water of blackfoot disease endemic areas. 5. Effect of fluorescent compounds on protein and nucleic acid synthesis in growing HeLa cells. ZHONGHUA MINGUO WEI SHENG WU XUE ZA ZHI = CHINESE JOURNAL OF MICROBIOLOGY 1977; 10:115-7. [PMID: 581189] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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612
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Chen JY, Deng JS, Lin YC. Effects of cordacin on lymphocyte activity in vitro. ZHONGHUA MINGUO WEI SHENG WU XUE ZA ZHI = CHINESE JOURNAL OF MICROBIOLOGY 1977; 10:112-4. [PMID: 581188] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The effects of cordacin on lymphocyte activity were studied with two parameters in vitro. The cordacin inhibited T lymphocyte E rosette formation by 93% at the concentration of 1,000 microgram/ml and tritiated-thymidine incorporation into PHA-transformed lymphocytes by 66% at the concentration of 10 microgram/ml. The implication of these results on replicating leukemic as well as normal cells is discussed.
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613
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Chen JY. [Nursing care of the patient with chronic obstructive pulmonary disease (COPD) (author's transl)]. HU LI ZA ZHI THE JOURNAL OF NURSING 1977; 24:49-55. [PMID: 244511] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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614
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Chen JY, Hsieh CC, Lin YC. Studies on Thermoactinomyces sp. TM9208. I. Description of the strain. ZHONGHUA MINGUO WEI SHENG WU XUE ZA ZHI = CHINESE JOURNAL OF MICROBIOLOGY 1977; 10:1-7. [PMID: 578130] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
A strain of Thermoactinomyces sp., TM9208, isolated from a soil sample in the Taipei area showed antagonistic activity to Gram positive bacteria but not to the Gram negative on the potato extract agar plate by the cross streaking method. The strain showed strong starch hydrolysis, beta type of hemolysis, brownish yellow growth on the potato extract agar and green on the nutrient agar. Its aerial mycelium, white to grayish white, was long and straight with short branches. The spores are single and have smooth surface. It is a good utilizer of starch, maltose and cellobiose as carbon source, but utilizes dulcitol, salicin, sucrose, rhamnose and sorbitol poorly.
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615
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Taketa F, Chen JY. Activation of the NADH-methemoglobin reductase reaction by inositol hexaphosphate. Biochem Biophys Res Commun 1977; 75:389-93. [PMID: 15563 DOI: 10.1016/0006-291x(77)91054-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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616
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Chen JY, Wu CM, Pan IH. Detection of adenovirus antigens in Sendai virus-induced multinucleate cells by fluorescent antibody technic. TAIWAN YI XUE HUI ZA ZHI. JOURNAL OF THE FORMOSAN MEDICAL ASSOCIATION 1976; 75:626-30. [PMID: 190337] [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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617
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Locke RK, Chen JY, Damico JN, Dusold LR, Sphon JA. Identification by physical means of organic moieties of conjugates produced from carbaryl by tobacco cells in suspension culture. ARCHIVES OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY 1976; 4:60-100. [PMID: 817672 DOI: 10.1007/bf02221015] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/16/2023]
Abstract
Carbaryl (1-naphthyl methylcarbamate), labeled with 14C in the C1-naphthyl, carbonyl, or N-methyl position, was introduced into the culture medium of tobacco cells in suspension culture. Following incubation, cells were homogenized in water, centrifugated, and supernatants hydrolyzed with beta-glucosidase or HCl. Organic moieties (moieties) were characterized by two-dimensional thin-layer chromatography (TLC), and many were subsequently identified by infrared and mass spectrometry. On the basis of the data obtained with 14C1-naphthyl-labeled carbaryl, it appeared that 18.4% of the total characterized metabolites represented unconjugated N-CH2OH- carbaryl [1-naphthyl N-(hydroxymethyl)carbamate], excreted by the cells into the culture medium. The metabolites found in the cells primarily consisted of conjugates of 1-naphthol (73.6% of the total characterized metabolites) and N-CH2OH-carbaryl (2.5%). Conjugates of 7-hydroxycarbaryl (7-hydroxy-1-napthyl methylcarbamate), 4-hydroxycarbaryl (4-hydroxy-1-naphthyl methylcarbamate), and 5-hydroxycarbaryl (5-hydroxy-1-naphthyl methylcarbamate) were also detected in small amounts. Of five unknown 14C1-naphthyl-labeled carbaryl metabolites, three were tentatively characterized as: O-1-naphthylcholesterol (Cholest-5-en-3beta-yl-1-napthol: 3.0%); an unconjugated hydroxylated 1,4-dihydro-1,4-epiperoxynapththalene (1.4%); and an acidlabile, beta-glucosidase-resistant conjugate of a cis-dihydrodiol of 1-naphthol (0.3%; other than the trans-5,6-dihydrodiol). The cholesterol derivative may represent a new "detoxification mechanism" in plants; the epiperoxide may help to elucidate plant oxidation mechanisms. A new TLC procedure was developed which successfully separated the acetate derivative of N-hydroxycarbaryl (1-naphthyl N-hydroxy-N-methylcarbamate) from 12 other common moieties of carbaryl metabolites and their acetate derivatives. A new two-dimensional TLC system was developed for the separation of underivatized N-hydroxycarbaryl from 14 other moieties of carbaryl metabolites; two additional two-dimensional TLC systems were utilized for moiety separations. With these TLC procedures, no conjugated or unconjugated N-hydroxycarbaryl could be detected in any tobacco cell culture fraction after incubation of cells in medium containing radiolabeled carbaryl. Authentic 14C1-naphthyl-labeled N-CH2OH-carbaryl was shown to be converted to desmethylcarbaryl (1-naphthylcarbamate) 97%) and 1-naphthol (3%) by 0.1N HCl hydrolysis.
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618
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Pan IH, Chen JY, Kao IY, Wei C, Chang RS. Quantitative study on leucine incorporation in multinucleate cells induced by Sendai virus. PROCEEDINGS OF THE SOCIETY FOR EXPERIMENTAL BIOLOGY AND MEDICINE. SOCIETY FOR EXPERIMENTAL BIOLOGY AND MEDICINE (NEW YORK, N.Y.) 1974; 147:453-5. [PMID: 4373759 DOI: 10.3181/00379727-147-38362] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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619
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Chen JY, Yand TI, Lin YC, Yand CS. Research note: Search for biologically active substances in Taiwan medicinal plants. 3. Further screening for anti-tumor and anti-microbial substances. ZHONGHUA MINGUO WEI SHENG WU XUE ZA ZHI = CHINESE JOURNAL OF MICROBIOLOGY 1974; 7:104-6. [PMID: 4479276] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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620
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Tanaka D, Chen JY. Retrograde thalamic degeneration: observations using a modification of the Fink-Heimer silver impregnation technique. Brain Res 1974; 65:333-7. [PMID: 4138677 DOI: 10.1016/0006-8993(74)90045-6] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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621
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622
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Pan IH, Chen JY. Quantitative study on RNA metabolism in mononucleate and Sendai virus-induced multinucleate cells. TAIWAN YI XUE HUI ZA ZHI. JOURNAL OF THE FORMOSAN MEDICAL ASSOCIATION 1973; 72:129-34. [PMID: 4350085] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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623
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Ho WY, Chen JY. Acupuncture anesthesia. A report of two cases. THE AMERICAN JOURNAL OF CHINESE MEDICINE 1973; 1:151-4. [PMID: 4774348 DOI: 10.1142/s0192415x73000140] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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624
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Chen JY. Infrared studies of dicyclohexylamine. JOURNAL - ASSOCIATION OF OFFICIAL ANALYTICAL CHEMISTS 1972; 55:1015-23. [PMID: 5071856] [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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625
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Chen JY, Gould JH. Infrared studies of cyclohexylamine. JOURNAL - ASSOCIATION OF OFFICIAL ANALYTICAL CHEMISTS 1972; 55:1006-14. [PMID: 5071855] [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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