Mixing Chiral Polytopes

An abstract polytope of rank n is said to be chiral if its automorphism group has two orbits on the flags, such that adjacent flags belong to distinct orbits. Examples of chiral polytopes have been difficult to find. A "mixing" construction lets us combine polytopes to build new regular and chiral polytopes. By using the chirality group of a polytope, we are able to give simple criteria for when the mix of two polytopes is chiral

Highly symmetric hypertopes

We study incidence geometries that are thin and residually connected. These geometries generalise abstract polytopes. In this generalised setting, guided by the ideas from the polytopes theory, we introduce the concept of chirality, a property of orderly asymmetry occurring frequently in nature as a natural phenomenon. The main result in this paper is that automorphism groups of regular and chiral thin residually connected geometries need to be C-groups in the regular case and C+-groups in the chiral case

Search for a W ' boson decaying to a muon and a neutrino in pp collisions at √s =7 TeV

This is the Pre-Print version of the Article. The official published version can be accessed from the link below - Copyright @ 2011 ElsevierA new heavy gauge boson, W', decaying to a muon and a neutrino, is searched for in pp collisions at a centre-of-mass of 7 TeV. The data, collected with the CMS detector at the LHC, correspond to an integrated luminosity of 36 inverse picobarns. No significant excess of events above the standard model expectation is found in the transverse mass distribution of the muon-neutrino system. Masses below 1.40 TeV are excluded at the 95% confidence level for a sequential standard-model-like W'. The W' mass lower limit increases to 1.58 TeV when the present analysis is combined with the CMS result for the electron channel.This work is supported by the FMSR (Austria); FNRS and FWO (Belgium); CNPq, CAPES, FAPERJ, and FAPESP (Brazil); MES (Bulgaria); CERN; CAS, MoST, and NSFC (China); COLCIENCIAS (Colombia); MSES (Croatia); RPF (Cyprus); Academy of Sciences and NICPB (Estonia); Academy of Finland, ME, and HIP (Finland); CEA and CNRS/IN2P3 (France); BMBF, DFG, and HGF (Germany); GSRT (Greece); OTKA and NKTH (Hungary); DAE and DST (India); IPM (Iran); SFI (Ireland); INFN (Italy); NRF and WCU (Korea); LAS (Lithuania); CINVESTAV, CONACYT, SEP, and UASLP-FAI (Mexico); PAEC (Pakistan); SCSR (Poland); FCT (Portugal); JINR (Armenia, Belarus, Georgia, Ukraine, Uzbekistan); MST and MAE (Russia); MSTD (Serbia); MICINN and CPAN (Spain); Swiss Funding Agencies (Switzerland); NSC (Taipei); TUBITAK and TAEK (Turkey); STFC (United Kingdom); DOE and NSF (USA)

First measurement of hadronic event shapes in pp collisions at √s = 7 TeV

This is the Pre-Print version of the Article - Copyright @ 2011 ElsevierHadronic event shapes have been measured in proton-proton collisions at sqrt(s)=7 TeV, with a data sample collected with the CMS detector at the LHC. The sample corresponds to an integrated luminosity of 3.2 inverse picobarns. Event-shape distributions, corrected for detector response, are compared with five models of QCD multijet production

Search for microscopic black hole signatures at the Large Hadron Collider

This is the Pre-Print version of the Article. The official published paper can be accessed from the link below - Copyright @ 2011 ElsevierA search for microscopic black hole production and decay in pp collisions at a center-of-mass energy of 7 TeV has been conducted by the CMS Collaboration at the LHC, using a data sample corresponding to an integrated luminosity of 35 inverse picobarns. Events with large total transverse energy are analyzed for the presence of multiple high-energy jets, leptons, and photons, typical of a signal expected from a microscopic black hole. Good agreement with the expected standard model backgrounds, dominated by QCD multijet production, is observed for various final-state multiplicities. Limits on the minimum black hole mass are set, in the range 3.5 -- 4.5 TeV, for a variety of parameters in a model with large extra dimensions, along with model-independent limits on new physics in these final states. These are the first direct limits on black hole production at a particle accelerator.This work is supported by the FMSR (Austria); FNRS and FWO (Belgium); CNPq, CAPES, FAPERJ, and FAPESP (Brazil); MES (Bulgaria); CERN; CAS, MoST, and NSFC (China); COLCIENCIAS (Colombia); MSES (Croatia); RPF (Cyprus); Academy of Sciences and NICPB (Estonia); Academy of Finland, ME, and HIP (Finland); CEA and CNRS/IN2P3 (France); BMBF, DFG, and HGF (Germany); GSRT (Greece); OTKA and NKTH (Hungary); DAE and DST (India); IPM (Iran); SFI (Ireland); INFN (Italy); NRF and WCU (Korea); LAS (Lithuania); CINVESTAV, CONACYT, SEP, and UASLP-FAI (Mexico); PAEC (Pakistan); SCSR (Poland); FCT (Portugal); JINR (Armenia, Belarus, Georgia, Ukraine, Uzbekistan); MST and MAE (Russia); MSTD (Serbia); MICINN and CPAN (Spain); Swiss Funding Agencies (Switzerland); NSC (Taipei); TUBITAK and TAEK (Turkey); STFC (United Kingdom); DOE and NSF (USA)

Search for a heavy bottom-like quark in pp collisions at √s =7 TeV

This is the Pre-Print version of the Article. The official published version of the paper can be accessed from the link below - Copyright @ 2011 Elsevier.A search for pair-produced bottom-like quarks in pp collisions at sqrt(s) = 7 TeV is conducted with the CMS experiment at the LHC. The decay b' to tW is considered in this search. The b' b'-bar to tW^- t-bar W^+ process can be identified by the distinctive signature of trileptons and same-sign dileptons. With a data sample corresponding to an integrated luminosity of 34 inverse picobarns, no excess above the standard model background predictions is observed and a b' quark with a mass between 255 and 361 GeV/c^2 is excluded at the 95% confidence level.This work is supported by the FMSR (Austria); FNRS and FWO (Belgium); CNPq, CAPES, FAPERJ, and FAPESP (Brazil); MES (Bulgaria); CERN; CAS, MoST, and NSFC (China); COLCIENCIAS (Colombia); MSES (Croatia); RPF (Cyprus); Academy of Sciences and NICPB (Estonia); Academy of Finland, ME, and HIP (Finland); CEA and CNRS/IN2P3 (France); BMBF, DFG, and HGF (Germany); GSRT (Greece); OTKA and NKTH (Hungary); DAE and DST (India); IPM (Iran); SFI (Ireland); INFN (Italy); NRF and WCU (Korea); LAS (Lithuania); CINVESTAV, CONACYT, SEP, and UASLP-FAI (Mexico); PAEC (Pakistan); SCSR (Poland); FCT (Portugal); JINR (Armenia, Belarus, Georgia, Ukraine, Uzbekistan); MST and MAE (Russia); MSTD (Serbia); MICINN and CPAN (Spain); Swiss Funding Agencies (Switzerland); NSC (Taipei); TUBITAK and TAEK (Turkey); STFC (United Kingdom); DOE and NSF (USA)

The Amino Acid Sequence Of Ribitol Dehydrogenase-f, A Mutant Enzyme With Improved Xylitol Dehydrogenase Activity

A mutant ribitol dehydrogenase (RDH-F) was purified from Klebsiella aerogenes strain F which evolved from the wild-type strain A under selective pressure to improve growth on xylitol, a poor substrate used as sole carbon source. The ratio of activities on xylitol (500 mM) and ribitol (50 mM) was 0.154 for RDH-F compared to 0.033 for the wild-type (RDH-A) enzyme. The complete amino acid sequence of RDH-F showed the mutations. Q60 for E60 and V215 for L215 in the single polypeptide chain of 249 amino acid residues. Structural modeling based on homologies with two other microbial dehydrogenases suggests that E60 → Q60 is a neutral mutation, since it lies in a region far from the catalytic site and should not cause structural perturbations. In contrast, L215 → V215 lies in variable region II and would shift a loop that interacts with the NADH cofactor. Another improved ribitol dehydrogenase, RDH-D, contains an Al96 → P196 mutation that would disrupt a surface α-helix in region II. Hence conformational changes in this region appear to be responsible for the improved xylitol specificity. © 1999 Plenum Publishing Corporation.184489495Burleigh, B.D., Rigby, P.W.J., Hartley, B.S., (1974) Biochem. J., 143, pp. 341-352Butler, P.J.G., Hartley, B.S., (1972) Methods in Enzymology, 25, pp. 191-199. , (Hirs, C. H., and Timasheff, S. N., eds:), Academic Press, New YorkCintra, A.C.O., Vieira, C.A., Giglio, J.R., (1990) J. Protein Chem., 9, pp. 221-227Cintra, A.C.O., Marangoni, S., Oliveira, B., Giglio, J.R., (1993) J. Protein Chem., 12, pp. 57-64Dothie, J.M., Giglio, J.R., Moore, C.B., Taylor, S.S., Hartley, B.S., (1985) Biochem, J., 230, pp. 569-578Ghosh, D., Weeks, C.M., Grochulski, P., Duax, W.L., Erman, M., Rimsay, R.L., Orr, J.C., (1991) Proc. Natl. Acad. Sci. USA, 88, pp. 10064-10068Giglio, J.R., (1977) Anal. Biochem., 82, pp. 262-264Gray, W.R., (1972) Methods in Enzymology, 25, pp. 333-344. , (Hirs, C. H., and Timasheff, S. N., eds.), Academic Press, New YorkGuex, N., Peitsch, M.C., (1997) Electrophoresis, 18, pp. 2714-2723Hartley, B.S., (1984) Microorganisms As Model Systems for Studying Evolution, pp. 23-54. , (Mortlock, R. P., ed.), Plenum Press, New YorkHartley, B.S., (1984) Microorganisms As Model Systems for Studying Evolution, pp. 55-108. , (Mortlock, R. P., ed.), Plenum Press, New YorkHartley, B.S., Altosaar, I., Dothie, J.W., Neuberger, M.S., (1976) Structure-Function Relationship of Proteins, pp. 191-200. , (Markham, R., and Horn, R. W., eds.), Elsevier/North-Holland, AmsterdamHulsmeyer, M., Hecht, H.J., Niefeld, K., Hofer, B., Eltis, L.D., Timmis, K.N., Schomberg, D., (1998) Protein Sci., 7, pp. 1286-1293Itzaki, R.F., Gill, D.M., (1964) Analyt. Biochem., 9, pp. 401-410Laemmli, U.K., (1970) Nature, 227, pp. 680-685Lerner, S.A., Wu, T.T., Lin, E.C.C., (1964) Science, 146, pp. 1313-1315Loviny, T., Norton, P.M., Hartley, B.S., (1985) Biochem. J., 230, pp. 579-585Marangoni, S., Ghiso, J., Sampaio, S.V., Arantes, E.C., Giglio, J.R., Oliveira, B., Frangione, B., (1990) J. Protein Chem., 9, pp. 595-601Mortlock, R.P., Fossit, D.D., Wood, W.A., (1965) Proc. Natl. Acad. Sci. USA, 54, pp. 572-579Offord, R.E., (1966) Nature, 211, pp. 591-593Rigby, W.J., Burleigh, B.D., Hartley, B.S., (1974) Nature, 251, pp. 200-204Ryle, A.P., Sanger, F., Smith, L.F., Kitai, R., (1955) Biochem. J., 60, pp. 541-556Skoog, B., Wichman, A., (1986) Trends Anal. Chem., 5, pp. 82-93Taylor, S.S., Rigby, P.W.J., Hartley, B.S., (1974) Biochem. J., 141, pp. 693-700Wu, T.T., Lin, E.C.C., Tanaka, S., (1968) J. Bact., 96, pp. 447-45

Chiral Polytopes and Suzuki Simple Groups

info:eu-repo/semantics/publishe