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Article
Topoisomerases, New Targets in Cancer Chemotherapy
The enzymes involved in the regulation of the three-dimensional structure of DNA, topoisomerase I and II, are important for the handling of DNA during vital cellular processes such as translation, transcriptio...
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Article
Crystal structures and melting points of saturated triacylglycerols in the β-3 phase
A comprehensive packing analysis is presented of the crystal structures of a large number of saturated triacylglycerols in the β-3 phase. The triacylglycerolsp.q.r have been grouped into four classes:r=p,p+2,p+4 ...
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Article
NMR spectroscopy analysis of phosphorus metabolites and the effect of adriamycin on these metabolite levels in an adriamycin-sensitive and -resistant human small cell lung carcinoma cell line
31P nuclear magnetic resonance (NMR) spectra of cells and of cell extract revealed high levels of phosphorylcholine (PC) and phosphocreatine (PCr) in an adriamycin-resistant human small cell lung carcinoma cel...
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Article
Crystal structures and melting points of unsaturated triacylglycerols in theβ phase
Theβ-phase crystal structures of unsaturated triacyl-glycerols (TAGs) have been analyzed. Long spacings and melting points of monounsaturated TAGs such as16· O· 16 and16· O ·18 indicate aβ-3C packing mode with a ...
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Article
Measurement of theZ 0 line shape parameters and the electroweak couplings of charged leptons
We report on an improved measurement of the mass of theZ 0 boson, its total width and its partial decay widths into hadrons and leptons, as well as the effective axial vector and vector couplings to charged lepto...
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Article
A direct measurement of theZ 0 invisible width by single photon counting
The OPAL detector at LEP is used to measure the branching ratio of theZ 0 into invisible particles by measuring the cross section of single photon events ine + e − collisions at centre-of-mass energies near theZ
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Article
Measurement of three-jet distributions sensitive to the gluon spin ine + e − annihilations at \(\sqrt s = 91\) GeV
Three-jet variables constructed from multi-hadronic events produced byZ 0 decays are compared to theoretical calculations assuming a vector gluon or a hypothetical scalar gluon. The data yield conclusive direct e...
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Article
A global determination of \(\alpha _s (M_{Z^0 } )\) at LEP
The value of the strong coupling constant, \(\alpha _s (M_{Z^0 } )\) , is determined from a study of 15 different obs...
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Article
Properties of multihadronic events with a final state photon at \(\sqrt s = M_{Z^0 } \)
The properties of final state photons in multihadronic decays of theZ 0 and those of the recoiling hadronic system are discussed and compared with theoretical expectations. The yield of two and three jet events w...
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Article
A measurement of electron production in hadronicZ 0 decays and a determination of \(\Gamma (Z^0 \to b\bar b)\)
The production rate of electrons with momentump>4 GeV/c and large momentum transverse to the jet containing the electron has been measured in 136000 hadronic decays of theZ 0 recorded with the OPAL detector at LE...
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Article
Inclusive neutral vector meson production in hadronicZ 0 decays
Results are reported of a study of neutral vector meson production in multihadronicZ 0 decays in the OPAL experiment at LEP. Pions and kaons have been identified by specific ionisation energy loss andK ± π ∓ andK
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Article
A study of charged particle multiplicities in hadronic decays of theZ 0
We present an analysis of multiplicity distributions of charged particles produced inZ 0 hadronic decays. The results are based on the analysis of 82941 events collected within 100 MeV of theZ 0 peak energy with ...
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Article
The forward-backward asymmetry of \(e^ + e^ - \to b\bar b and e^ + e^ - \to c\bar c\) using leptons in hadronicZ 0 decays
The forward-backward asymmetries of \(e^ + e^ - \to Z^0 \to b\bar b and e^ + e^ - \to Z^0 \to c\bar c\) have been me...
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Article
A determination ofα s( \(M_{Z^0 } \) ) at LEP using resummed QCD calculations
The strong coupling constant, αs, has been determined in hadronic decays of theZ 0 resonance, using measurements of seven observables relating to global event shapes, energy correlations and jet rates. The data h...
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Article
Precision measurements of the neutral current from hadron and lepton production at LEP
New measurements of the hadronic and leptonic cross sections and of the leptonic forward-backward asymmetries ine + e − collisions are presented. The analysis includes data recorded up to the end of 1991 by the O...
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Article
Measurements of \(B^0 - \bar B^0 \) mixing, \({{\Gamma (Z^0 \to b\bar b)} \mathord{\left/ {\vphantom {{\Gamma (Z^0 \to b\bar b)} {\Gamma (Z^0 \to hadrons)}}} \right. \kern-0em} {\Gamma (Z^0 \to hadrons)}}\) and semileptonic branching ratios forb-flavoured hadrons in hadronicZ 0 decays
From a sample of about 450 000 hadronicZ 0 decays, measurements of the average $$B^0 - \bar B^0 $...
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Article
Measurement of the τ lifetime
The τ lifetime has been measured with the OPAL detector at LEP, from analyses using the impact parameters in decays to single charged tracks, and the decay lengths from τ decays to three charged tracks. The 19...
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Article
QCD coherence studies using two particle azimuthal correlations
From a sample of 146900 hadronicZ 0 decays recorded by the OPAL detector at LEP, we have studied the azimuthal correlations of particles in hadronic events. It is expected that these correlations are sensitive to...
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Article
Measurement of the averageb hadron lifetime inZ 0 decays
A sample of 2610 electron candidates and 2762 muon candidates identified in hadronicZ 0 decays has been used to measure the averageb hadron lifetime. These data were recorded with the OPAL detector during 1990 an...
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Article
A study of differences between quark and gluon jets using vertex tagging of quark jets
Quark and gluon jets with equal energies are identified in three-jet hadronicZ 0 events, using reconstructed secondary vertices from heavy quark decay in conjunction with energy ordering of the jets to anti-tag t...
