1201
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Yu W, Xu Z. Plasma-wave excitation in an expanding plasma with a self-consistently steepened density profile. PHYSICAL REVIEW. A, GENERAL PHYSICS 1987; 36:285-288. [PMID: 9898682 DOI: 10.1103/physreva.36.285] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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1202
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Yu W, FREISER H. Electrochemical study on the mechanism of lanthanide ion extraction with methylene bis(diphenylphosphine oxide) at ascending water electrode. ANAL SCI 1987. [DOI: 10.2116/analsci.3.401] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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1203
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Yu W, Xu Z, Chen Z. Regeneration of the electromagnetic wave in an inhomogeneous magnetized plasma. PHYSICAL REVIEW. A, GENERAL PHYSICS 1986; 34:4181-4183. [PMID: 9897764 DOI: 10.1103/physreva.34.4181] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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1204
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Thompson HC, Billedeau SM, Miller BJ, Clarkson S, Feit M, Hotchkiss J, Miller B, Yu W. Gas Chromatographic-Thermal Energy Analysis Method for iV-Nitrosodibutylamine in Latex Infant Pacifiers: Collaborative Study. J AOAC Int 1986. [DOI: 10.1093/jaoac/69.3.504] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Abstract
Each of 5 collaborating laboratories determined volatile N-nitrosamines in 3 blind quadruplicate sets of latex rubber infant pacifier samples, using a gas chromatographic-thermal energy analysis (GCTEA) method. Volatile N-nitrosamines are extracted from cut-up pacifier nipples with CH2C12. The extract is concentrated and subjected to high temperature purge and trap, and the nitrosamines are eluted from the trap and determined by GC-TEA. N-Nitrosodibutylamine (NDBA) was the only nitrosamine found in sufficient concentration to allow analysis. NDBA concentrations of the 3 sets of samples were 82.6,21.0, and 7.12 ng/g rubber. The repeatability relative standard deviations ranged from 7.46 to 24.0% and the reproducibility relative standard deviations from 7.46 to 29.2%. The minimum detectable level of NDBA by this method is 3.6 ng/g rubber. The method has been adopted official first action.
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1205
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Baker GA, Benofy LP, Enting IG, Kofalt D, Yu W, Egami T, McGuire TR. Yang-Lee edge for the two-dimensional Ising model. PHYSICAL REVIEW. B, CONDENSED MATTER 1986; 33:3187-3208. [PMID: 9938701 DOI: 10.1103/physrevb.33.3187] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
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1206
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Bianchi R, Cole E, Hall R, Hofberg A, Losiewicz E, Nelson R, Noel R, Roach G, Solomon W, Yu W. Committee on Safety. J AOAC Int 1986. [DOI: 10.1093/jaoac/69.2.325a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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1207
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Chien CL, Liou SH, Kofalt D, Yu W, Egami T, Watson TJ, McGuire TR. Magnetic properties of FexCu100-x solid solutions. PHYSICAL REVIEW. B, CONDENSED MATTER 1986; 33:3247-3250. [PMID: 9938703 DOI: 10.1103/physrevb.33.3247] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
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1208
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Deng X, Liang X, Chen Z, Yu W, Ma R. Uniform illumination of large targets using a lens array. APPLIED OPTICS 1986; 25:377-381. [PMID: 18231185 DOI: 10.1364/ao.25.000377] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Inserting an array of nearly 100 similar lenses into a common focal system, the uniformity of the illumination of a target can evidently be improved without being affected by the near-field distribution of laser beams. We report here geometrical- and physical-optics analyses of the lens array and compare them with the experimental results.
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1209
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Donehoo P, Yu W, Ritchie R. On the growth of cracks at the fatigue threshold following compression overloads: Role of load ratio. ACTA ACUST UNITED AC 1985. [DOI: 10.1016/0025-5416(85)90105-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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1210
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Xu Z, Yu W, Zhang W. Hydrodynamic modification of an expanding plasma by laser radiation. PHYSICAL REVIEW. A, GENERAL PHYSICS 1985; 32:659-661. [PMID: 9896102 DOI: 10.1103/physreva.32.659] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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1211
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Curry SH, Kwon HR, Perrin JH, Culp JR, Pepine CJ, Yu W. Nitroglycerin levels after administration via transdermal therapeutic system or nitroglycerin ointment. Lancet 1984; 1:1297. [PMID: 6145002 DOI: 10.1016/s0140-6736(84)92476-0] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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1212
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Hou JC, Yu W, Kou MX, Ling YL. [Comparison studies on levels of CIC, complement C and its breakdown product C3c in chronic bronchitis and systemic lupus erythematosis]. ZHONGGUO YI XUE KE XUE YUAN XUE BAO. ACTA ACADEMIAE MEDICINAE SINICAE 1984; 6:232-3. [PMID: 6241058] [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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1213
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Yu W. [The organization of the one percent National Sample Survey of Fertility and its findings]. REN KOU YAN JIU = RENKOU YANJIU 1983:18-9. [PMID: 12159338] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/26/2023]
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1214
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Yu W, Gerberich W. On the controlling parameters for fatigue-crack threshold at low homologous temperatures. ACTA ACUST UNITED AC 1983. [DOI: 10.1016/0036-9748(83)90080-7] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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1215
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Kleppe G, Yu W, Strominger JL. Penicillin-binding proteins in Bacillus subtilis mutants. Antimicrob Agents Chemother 1982; 21:979-83. [PMID: 6810758 PMCID: PMC182056 DOI: 10.1128/aac.21.6.979] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
The penicillin-binding proteins (PBPs) from mutants of Bacillus subtilis were studied and related to morphology. In a previously described cloxacillin-resistant mutant of B. subtilis strain Porton, PBP 2a had an altered mobility by sodium dodecyl sulfate gel electrophoresis and was present in increased amounts. In addition, PBPs 1a and 1b were missing in this mutant. The only morphological change seen was a decrease in size of about 15%. Studies of two Triton-resistant morphological mutants of B. subtilis 168, Tr49 (small diameter) and Tr61 (helical form), revealed no change in the number of PBPs compared with that of the parent strain. However, PBPs 1a and 1b had an altered mobility in the mutant Tr49.
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1216
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Highberger JH, Corbett C, Dixit SN, Yu W, Seyer JM, Kang AH, Gross J. Amino acid sequence of chick skin collagen alpha 1(I)-CB8 and the complete primary structure of the helical portion of the chick skin collagen alpha 1(I) chain. Biochemistry 1982; 21:2048-55. [PMID: 7093229 DOI: 10.1021/bi00538a011] [Citation(s) in RCA: 33] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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1217
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Yu W. [The relationships between population and economy, and between population and education]. REN KOU YAN JIU = RENKOU YANJIU 1981:4-10. [PMID: 12264403] [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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1218
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Waxman DJ, Yu W, Strominger JL. Linear, uncross-linked peptidoglycan secreted by penicillin-treated Bacillus subtilis. Isolation and characterization as a substrate for penicillin-sensitive D-alanine carboxypeptidases. J Biol Chem 1980; 255:11577-87. [PMID: 6777380] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
Incubation of growing Bacillus subtilis with penicillin G led to the secretion of a peptidoglycan-related polymer and a nonglycan-bound pentapeptide into the culture medium. The secreted polymer was isolated and characterized as a linear cell wall glycan strand substituted predominantly by uncross-linked pentapeptide side chains. Polymer formation and secretion are most likely the result of continued synthesis and elongation of nascent glycan strands in the absence of subsequent processing by peptidoglycan transpeptidase or D-alanine carboxypeptidase enzymes. The nonglycan-bound pentapeptide, L-Ala-D-iso-Glu-meso-diaminopimelic acid-D-Ala-D-Ala, was probably formed by an N-acetylmuramyl-L-alanine amidase active on the peptide side chains of The uncross-linked polymer. The uncross-linked peptidoglycan polymer was shown to be a good substrate for penicillin-sensitive D-alanine carboxypeptidases purified from membranes of B. subtilis, Bacillus stearothermophilus, and Escherichia coli. D-alanine release was not, however, coupled to the cross-linking of peptide side chains, suggesting that these enzymes do not function as peptidoglycan transpeptidases in vivo. No transpeptidase or D-alanine carboxypeptidase activity was detected in mixtures of high molecular weight penicillin-binding proteins from B. subtilis, B. stearothermophilus, or Staphylococcus aureus. Possible reasons for the inability to demonstrate these activities are discussed. In addition, an N-acetylmuramyl-L-alanine amidase activity which copurifies with penicillin-binding proteins from B. subtilis, S. aureus, and E. coli was partially characterized.
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1219
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Arnold S, Alfano RR, Pope M, Yu W, Ho P, Selsby R, Tharrats J, Swenberg CE. Erratum: Triplet exciton caging in two dimensions. J Chem Phys 1979. [DOI: 10.1063/1.438052] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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1220
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Yu W, Pellegrino F, Grant M, Alfano RR. Subnanosecond fluorescence quenching of dye molecules in solution. J Chem Phys 1977. [DOI: 10.1063/1.435040] [Citation(s) in RCA: 84] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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1221
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Yu W, Pellegrino F, Alfano RR. Time-resolved fluorescence spectroscopy of spinach chloroplast. BIOCHIMICA ET BIOPHYSICA ACTA 1977; 460:171-81. [PMID: 856264 DOI: 10.1016/0005-2728(77)90164-5] [Citation(s) in RCA: 29] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Picosecond fluorescent kinetics and time-resolved spectra of spinach chloroplast were measured at room temperature and low temperatures. The measurement is conducted with 530 nm excitation at an average intensity of 2-10(14) photons/cm2, pluse and at a pulse separation of 6 ns for the 100 pulses used. The 685 nm fluorescent kinetics was found to decay with two components, a fast component with a 56 ps lifetime, and a slow component with a 220 ps lifetime. The 730 nm fluorescent kinetics at room temperature is a single exponential decay with a 100 ps lifetime. The 730 nm fluorescence lifetime was found to increase by a factor of 6 when the temperature was lowered from room temperature to 90 K, while the 685 and 695 nm fluorescent kinetics were unchanged. The time-resolved spectra data obtained within 10 ps after excitation is consistent with the kinetic data reported here. A two-level fluorescence scheme is proposed to explain the kinetics. The effect of excitation with high light intensity and multiple pulses is discussed.
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1222
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Arnold S, Alfano RR, Pope M, Yu W, Ho P, Selsby R, Tharrats J, Swenberg CE. Triplet exciton caging in two dimensions. J Chem Phys 1976. [DOI: 10.1063/1.432184] [Citation(s) in RCA: 34] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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1223
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Ho P, Yu W, Alfano R. Relaxation of the optical Kerr effect of anisotropic molecules in mixed liquids. Chem Phys Lett 1976. [DOI: 10.1016/0009-2614(76)80168-6] [Citation(s) in RCA: 28] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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1224
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Yu W, Ho PP, Alfano RR, Seibert M. Fluorescent kinetics of chlorophyll in photosystems I and II enriched fractions of spinach. BIOCHIMICA ET BIOPHYSICA ACTA 1975; 387:159-64. [PMID: 1125285 DOI: 10.1016/0005-2728(75)90060-2] [Citation(s) in RCA: 32] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
The fluorescent emission kinetics of spinach subchloroplast Photosystems I and II particles have been studied on a picosecond time scale. Using picosecond laser pulses and an optical Kerr gate, the fluorescent decay times are measured to be 60 plus or minus 10 ps, and 200 plus or minus 20 ps for Photosystems I and II, respectively. The quantum yields are calculated to be 0.004 for Photosystem I and 0.013 for Photosystem II. Theory of exciton energy transfer and trapping is applied for the determination of intermolecular potential energyin the photosystems.
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1225
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Yu W, Schweigel JF. Flexor digitorum sublimis to profundus tendon transfer for flexion deformities in spastic paralysis. Can J Surg 1974; 17:225-31. [PMID: 4841170] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
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1226
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Yu W, Shim SS, Hawk HE. Bone circulation in hemorrhagic shock. An experimental study. J Bone Joint Surg Am 1972; 54:1157-66. [PMID: 4652048] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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1227
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Schmerzler E, Yu W, Hewitt MI, Greenblatt IJ. Gas chromatographic determination of codeine in serum and urine. J Pharm Sci 1966; 55:155-7. [PMID: 5923261 DOI: 10.1002/jps.2600550205] [Citation(s) in RCA: 28] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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