1001
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Chen YC. [Nursing care of patients with cardiovascular disease: a study on cardiac catheterization]. HU LI ZA ZHI THE JOURNAL OF NURSING 1978; 25:1-10. [PMID: 253007] [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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1002
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Lin JY, Hou MJ, Chen YC. Isolation of toxic and non-toxic lectins from the bitter pear melon Momordica charantia Linn. Toxicon 1978; 16:653-60. [PMID: 725959 DOI: 10.1016/0041-0101(78)90193-9] [Citation(s) in RCA: 34] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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1003
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Chen FW, Chen YC, Deng JS, Chen TS, Chen GH. HLA antigens and diffuse toxic goiter in Taiwan. TAIWAN YI XUE HUI ZA ZHI. JOURNAL OF THE FORMOSAN MEDICAL ASSOCIATION 1978; 77:77-83. [PMID: 274517] [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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1004
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Wilson SH, Matsukage A, Bohn EW, Chen YC, Sivarajan M. Polynucleotide recognition by DNA alpha-polymerase. Nucleic Acids Res 1977; 4:3981-96. [PMID: 593896 PMCID: PMC343215 DOI: 10.1093/nar/4.11.3981] [Citation(s) in RCA: 32] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
In a survey of template-primer preference of a mouse myeloma DNA alpha-polymerase, the fastest rate of DNA synthesis was with poly(dT) as template and (rA)24 as primer. Such a preference for poly(dT).oligo(rA) was not observed with other DNA polymerases of mouse origin. DNA synthesis in this system resulted in formation of oligo(dA) chains, not template-length poly(dA); thus, the average enzyme molecule bound to a poly(dT).(rA)24 complex and initiated a new oligo(dA) chain many times during the incubation. Binding experiments revealed that the alpha-polymerase had high affinity for poly(dT). Although the alpha-polymerase did not bind to poly(dl) and failed to replicate it inreactions with a base pair complementary primer, poly(dl) was replicated after a (dT) block had been grafted to its 3'-end and the oligo(rA) primer had been added. In similar experiments, the (dT) block was found to be much more effective than other 3'-terminal blocks in promoting replication of denatured calf thymus DNA. The results indicate that specific base sequences may regulate initiation of DNA syntehsis by this alpha-polymerase.
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1005
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Chen YC, Hayman MJ, Vogt PK. Properties of mammalian cells transformed by temperature-sensitive mutants of avian sarcoma virus. Cell 1977; 11:513-21. [PMID: 195741 DOI: 10.1016/0092-8674(77)90069-1] [Citation(s) in RCA: 64] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Fibroblasts from European field vole (Microtus agrestis) and from normal rat kidney (NRK) have been infected by avian sarcoma virus mutants which are temperature-sensitive for the maintenance of transformation. These cells are transformed at 33 degrees C, but show normal cell characteristics in morphology, colony formation in agar, saturation density, sugar uptake and membrane proteins at 39 degrees C and 40 degrees C, the nonpermissive temperatures. Ts mutant virus was rescued from most of the ts transformed cell lines. NRK cells infected by avian sarcoma virus ts mutants and kept at the nonpermissive temperature can be transformed by wild-type avian sarcoma virus. The susceptibility of the temperature-sensitive NRK lines to this transformation is higher than the susceptibility of uninfected NRK at either permissive or nonpermissive temperature.
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1006
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Ouyang C, Teng CM, Chen YC. Physicochemical properties of alpha- and beta-fibrinogenases of Trimeresurus mucrosquamatus venom. BIOCHIMICA ET BIOPHYSICA ACTA 1977; 481:622-30. [PMID: 15616 DOI: 10.1016/0005-2744(77)90295-9] [Citation(s) in RCA: 36] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
alpha- and beta-Fibrinogenases (EC 3.4.21.5) were purified from Trimeresurus mucrosquamatus venom by the technique of recycling chromatography. Both enzymes were single polypeptide chains and homogeneous as judged by sodium dodecyl sulfate (SDS) polyacrylamide gel electrophoresis and ultracentrifugation. The sedimentation constants of alpha- and beta-fibrinogenases were 2.52 and 3.04 respectively. The molecular weight of alpha-fibrinogenase was 21 500--23 400, and that of beta-fibrinogenase was 25 000--26 000. The contents of proline, glycine and tryptophan were higher in beta-fibrinogenase than in alpha-fibrinogenase. The isoelectric points of alpha- and beta-fibrinogenases were pH 8.1 and 5.7 respectively. The optimal pH of alpha-fibrinogenase was about 7.4 and that of beta-fibrinogenase was around 8.5. The activity of alpha-fibrinogenase was completely destroyed after 30 min at 60 degrees C, pH 5.6, 7.4 and 9.0, while that of beta-fibrinogenase was not significantly affected by the same treatment. Both enzymes showed proteolytic activities toward fibrinogen and casein, but were devoid of phospholipase A, alkaline phosphomonoesterase and phosphodiesterase activities of the crude venom. The tosyl-L-arginine methylester esterase activity of beta-fibrinogenase was about 17 times that of the crude venom, while alpha-fibrinogenase was completely devoid of this activity. The fibrinogenolytic activity of alpha-fibrinogenase was markedly inhibited by EDTA and cysteine, while that of beta-fibrinogenase was inhibited markedly by phenylmethane sulfonylfluoride and slightly by tosyl-L-lysine chloromethylketone and cysteine.
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1007
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1008
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Chen YC. [Hospitalized school-age children's concept about body organs and illness]. HU LI ZA ZHI THE JOURNAL OF NURSING 1976; 23:61-73. [PMID: 1050380] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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1009
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Krugh TR, Chen YC. Actinomycin D-deoxynucleotide complexes as models for the actinomycin D-DNA complex. The use of nuclear magnetic resonance to determine the stoichiometry and the geometry of the complexes. Biochemistry 1975; 14:4912-22. [PMID: 1182128 DOI: 10.1021/bi00693a021] [Citation(s) in RCA: 32] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
The use of proton and carbon-13 magnetic resonance spectroscopy for the determination of the geometry and the stoichiometry of the actinomycin D-deoxyguanosine 5'-monophosphate complex is outlined. The dimerization of actinomycin D has been reexamined by recording the proton magnetic resonance spectrum of actinomycin D to much lower concentrations through the use of Fourier transform nuclear magnetic resonance techniques. The effect of the actinomycin D dimerization on the observed chemical shifts that results from the additon of nucleotides to an actinomycin D solution is directly demonstrated by comparing the actinomycin D-nucleotide titrations at both low (approximately 0.3 mM) and high (approximately 12 mM) concentrations of actinomycin D. In the presence of excess nucleotide the chemical shifts of the actinomycin D groups were essentially the same for both the low and high concentration titrations. The complexes of actinomycin D with pdG-dC, dG-dC, deoxyguanosine 3'-monophosphate, G-C, C-G, dIMP(5'), 2, 6-diaminopurine deoxyribose, and other nucleotides were also investigated by proton magnetic resonance and visible spectral titrations. These data were interpreted in terms of the molecular geometry of the complexes and in terms of the effect of the structure of the nucleotide base on the relative binding affinity of the nucleotides for the two nucleotide binding sites of actinomycin D. The carbon-13 chemical shifts of dGMP(5') were measured as a function of concentration over the concentration range of 0.5-0.025 M. The infinite dilution carbon-13 chemical shifts were graphically estimated from the dilution curves. These values were used to calculate the changes in the chemical shifts of the dGMP carbons that result from the formation of an actinomycin D-(dGMP)2 complex. It was not possible to interpret these carbon-13 chemical shift changes in terms of only ring current effects, which thus rules out the use of carbon-13 spectroscopy in the determination of the geometries of the actinomycin D complexes with the mono- and dinucleotides. The induced chemical shifts in the proton spectra may be used in the determination of the geometries of the complexes. A consideration of these data for the above nucleotide series shows that the predominant complex formed is one in which the guanine rings in the two nucleotide binding sites of actinomycin D are oriented in a manner very similar to that observed in the cocrystalline complex of actinomycin D with deoxyguanosine.
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1010
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Chen YC. [Mother-child relationship and maternal deprivation (author's transl)]. HU LI ZA ZHI THE JOURNAL OF NURSING 1975; 22:2-9. [PMID: 1044678] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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1011
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Friis RR, Mason WS, Chen YC, Halpern MS. A replication defective mutant of Rous sarcoma virus which fails to make a functional reverse transcriptase. Virology 1975; 64:49-62. [PMID: 46651 DOI: 10.1016/0042-6822(75)90078-1] [Citation(s) in RCA: 34] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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1012
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Gupta NK, Chatterjee B, Chen YC, Majumdar A. Protein synthesis in rabbit reticulocytes. A study of Met-tRNA f Met binding factor(s) and Met-tRNA f Met binding to ribosomes and AUG codon. J Biol Chem 1975; 250:853-62. [PMID: 1112794] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
The effects of additions of Mg-2+, ribosomes, and AUG codon on the Met-tRNAf Met-initiation factor-GTP complex were studied using a Millipore filtration method (J. Biol. Chem. 248, 4500 (1973)). Upon addition of increasing concentration of Mg-2+, the Met-tRNAf Met-initiation factor-GTP complex dissociates into free Met-tRNAf Met and initiation factor (GTP), with an infection around 1.5 to 2 mM Mg-2+. The Mg-2+-induced dissociation of Met-tRNAf Met-initiation factor-GTP complex was enhanced at ice bath temperature. At 37 degrees and in the presence of 1.5 to 2mM Mg-2+, the Met-tRNAf Met-initiation factor-GTP complex catalyzes the transfer of Met-tRNAf Met to ribosomes and AUG codon. Ribosome bound Met-tRNAf Met is stable to Mg-2+ and low temperature. A Millipore filtration assay for studies of (35S)Met-tRNAf Met binding to ribosomes and Aug codon has been developed. The assay procedure is carried out in three stages. In Stage I, the Met-tRNAf Met is bound to initiation factor in the presence of GTP, AUG codon (required for Stage II reaction), and 3.7 times 10-5 M aurintricarboxylic acid. The incubation is carried out at 37 degrees for 5 min. In Stage II, ribosomes and Mg-2+ (1.5 to 2mM final concentration) are added and the incubation is continued at 37 degrees for 10 min. In Stage III, more Mg-2+ is added to make the final Mg-2+ concentration of the incubation mixture 5 mM, and the reactions are further incubated at ice bath temperature for 10 min. The reactions are then terminated by addition of excess cold wash buffer and filtered through Millipore filters. Under the standard assay conditions, the radioactivity bound to Millipore filters in the absence of ribosomes and AUG codon is markedly reduced. Addition of ribosomes alone gave a significant increase in the radioactivity bound to Millipore filters. A further 2- to 3-fold stimulation of binding of (35S)Met-tRNAf Met to Millipore filters was observed when both ribosomes and AUG codon were added. The Met-tRNAf Met bound to ribosomes under the assay condition was reactive with puromycin. Upon DEAE-cellulose chromatography of a partially purified mixture of initiation factors (IF), Met-tRNAf Met binding activities separate into two forms, and are designated as IF-1A and IF-1B. These two forms can be distinguished by the stabilities of their respective Met-tRNAf Met-IF-1-GTP complexes to Mg-2+. The Met-tRNAf Met-IF-1A-GTP complex is distinctly more stable in the presence of Mg-2+ than Met-tRNAf Met-IF-1B-GTP complex. Continue.
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1013
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Gupta NK, Chatterjee B, Chen YC, Majumdar A. Protein synthesis in rabbit reticulocytes. A study of Met-tRNA f Met binding factor(s) and Met-tRNA f Met binding to ribosomes and AUG codon. J Biol Chem 1975. [DOI: 10.1016/s0021-9258(19)41864-4] [Citation(s) in RCA: 37] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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1014
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Chen YC. [Play as a means of communication with children]. HU LI ZA ZHI THE JOURNAL OF NURSING 1975; 22:2-7. [PMID: 1040649] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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1015
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Yang SS, Chen YC, Brough AJ, Bernstein J. Correlation of head circumference and crown-rump length in newborn infants. A potential indicator of congenital maldevelopment. BIOLOGY OF THE NEONATE 1975; 27:308-17. [PMID: 1174602 DOI: 10.1159/000240788] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
A study of 305 consecutive neonatal autopsies done by two prosectors showed a high correlation between the head circumference (HC) and crown-rump length (CR). The calculated formula can be stated approximately as HC equals 0.9 CR + 2.5 cm, and the two measurements are for all practical purposes equal in the immediate neonatal period, regardless of race, sex, age and body weight. When the HC was found to be significantly larger than CR, hydrocephalus and certain types of chondrodystrophy were present. When the HC was significantly smaller than CR, there was a higher incidence of congenital heart disease, especially hypoplastic left heart syndrome, and congenital central nervous system disorders other than hydrocephalus. From a practical point of view, a significant difference is a discrepancy of more than 2.5 cm. 102 consecutive living neonates were also similarly studied. It appears that the CR length when carefully measured under standardized condition is more reliable than the crown-heel length.
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1016
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Fujita DJ, Chen YC, Friis RR, Vogt PK. RNA tumor viruses of pheasants: characterization of avian leukosis subgroups F and G. Virology 1974; 60:558-71. [PMID: 4367494 DOI: 10.1016/0042-6822(74)90350-x] [Citation(s) in RCA: 52] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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1017
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Gupta NK, Chatterjee B, Chen YC, Majumdar A. Protein synthesis in rabbit reticulocytes: evidence for two forms of the Met-tRNA-f-Met binding factors. Biochem Biophys Res Commun 1974; 58:699-706. [PMID: 4836272 DOI: 10.1016/s0006-291x(74)80474-2] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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1018
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Abstract
Because the metabolic reaction that gives ethylene oxide is sterilizing qualities also takes place with human protein, it is imperative that any residual gas be removed before the sterilized material is used on the patient. This paper presents a method of estimating aeration time required following sterilization of polyvinyl choride (PVC) to reduced toxic residues to a desired level. The method proposed involves calculation of the coefficient of diffusivity, and the use of a simplified diffusion equation to estimate aeration time.
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1019
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Woodley CL, Chen YC, Gupta NK. Purification and properties of the peptide chain initiation factors from rabbit reticulocytes. Methods Enzymol 1974; 30:141-53. [PMID: 4604997 DOI: 10.1016/0076-6879(74)30017-1] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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1020
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Liu BY, Chen YC. [A comparison of apical beat and pulse rate in children (author's transl)]. HU LI ZA ZHI THE JOURNAL OF NURSING 1974; 21:47-54. [PMID: 4496267] [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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1021
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Gupta NK, Woodley CL, Chen YC, Bose KK. Protein synthesis in rabbit reticulocytes. Assays, purification, and properties of different ribosomal factors and their roles in peptide chain initiation. J Biol Chem 1973; 248:4500-11. [PMID: 4576139] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
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1022
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Lin JK, Chen YC, Horng SC, Tung TC. Inhibition of urea on the hepatocarcinogensis induced by N, N-dimethyl-4-aminoazobenzene in rats. TAIWAN YI XUE HUI ZA ZHI. JOURNAL OF THE FORMOSAN MEDICAL ASSOCIATION 1973; 72:262-6. [PMID: 4354396] [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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1023
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Chen YC, Woodley CL, Bose KK, Gupta KK. Protein synthesis in rabbit reticulocytes: characteristics of a Met-tRNA Met f binding factor. Biochem Biophys Res Commun 1972; 48:1-9. [PMID: 4557509 DOI: 10.1016/0006-291x(72)90335-x] [Citation(s) in RCA: 79] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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1024
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Woodley CL, Chen YC, Bose KK, Gupta NK. Protein synthesis in rabbit reticulocytes: characteristics of peptide chain initiation factors. Biochem Biophys Res Commun 1972; 46:839-48. [PMID: 5057910 DOI: 10.1016/s0006-291x(72)80217-1] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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1025
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Chen YC, Espiritu C, Woolley PV. Trisomy D1 syndrome with DqDq tandem translocation. AMERICAN JOURNAL OF DISEASES OF CHILDREN (1960) 1971; 122:535-7. [PMID: 5156262 DOI: 10.1001/archpedi.1971.02110060105019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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1026
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Chen HC, Wang CH, Tsan KW, Chen YC. An electron microscopic and radioautographic study on experimental kernicterus. II. Bilirubin movement within neurons and release of waste products via astroglia. THE AMERICAN JOURNAL OF PATHOLOGY 1971; 64:45-66. [PMID: 4104148 PMCID: PMC2047559] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Response of the neurons to bilirubin in asphyxiated newborn rabbits was studied in vivo with the use of the electron microscope and radioautographic technics. A morphologic basis for the mode of intraneuronal bilirubin movement in kernicterus has been established. The absorbed bilirubin had ready access to the Golgi complex from the dendrite through the neurotubules by a mechanism of centripetal dendroplasmic flow. The endoplasmic reticulum provided a subcellular canalicular system for the directed passage from the Golgi complex to the nuclear membrane. Proximodistal flow of bilirubin in the axoplasm caused spotty destruction of axons. The release of waste products from the affected neurons toward the capillaries is very likely an effect of reverse transastroglial transport.
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1027
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1028
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Krieger I, Chen YC. Calorie requirements for weight gain in infants with growth failure due to maternal deprivation, undernutrition, and congenital heart disease. A correlation analysis. Pediatrics 1969; 44:647-54. [PMID: 5374975] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
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1029
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Chen HC, Tsai DJ, Wang CH, Chen YC. An electron microscopic and radioautographic study on experimental kernicterus. I. Bilirubin transport via astroglia. THE AMERICAN JOURNAL OF PATHOLOGY 1969; 56:31-58. [PMID: 5815579 PMCID: PMC2013585] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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1030
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Whitten CF, Chen YC, Gibson GW. Studies in acute iron poisoning. 3. The hemodynamic alterations in acute experimental iron poisoning. Pediatr Res 1968; 2:479-85. [PMID: 5727918 DOI: 10.1203/00006450-196811000-00005] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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1031
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Whitten CF, Chen YC, Gibson GW. Studies in acute iron poisoning. II. Further observations on desferrioxamine in the treatment of acute experimental iron poisoning. Pediatrics 1966; 38:102-10. [PMID: 5937669] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/17/2023] Open
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