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Cloning of Agarase Gene from Non-Marine Agarolytic Bacterium Cellvibrio sp
( Ariga Osamu ),( Takayoshi Inoue ),( Hajime Kubo ),( Kimi Minami ),( Mitsuteru Nakamura ),( Michi Iwai ),( Hironori Moriyama ),( Mitsunori Yanagisawa ),( Kiyohiko Nakasaki ) 한국미생물 · 생명공학회 2012 Journal of microbiology and biotechnology Vol.22 No.9
Agarase genes of non-marine agarolytic bacterium Cellvibrio sp. were cloned into Escherichia coli and one of the genes obtained using HindIII was sequenced. From nucleotide and putative amino acid sequences (713 aa, molecular mass; 78,771 Da) of the gene, designated as agarase AgaA, the gene was found to have closest homology to the Saccharophagus degradans (formerly, Microbulbifer degradans) 2-40 aga86 gene, belonging to glycoside hydrolase family 86 (GH86). The putative protein appears to be a non-secreted protein because of the absence of a signal sequence. The recombinant protein was purified with anion exchange and gel filtration columns after ammonium sulfate precipitation and the molecular mass (79 kDa) determined by SDS-PAGE and subsequent enzymography agreed with the estimated value, suggesting that the enzyme is monomeric. The optimal pH and temperature for enzymatic hydrolysis of agarose were 6.5 and 42.5ºC, and the enzyme was stable under 40ºC. LC-MS and NMR analyses revealed production of a neoagarobiose and a neoagarotetraose with a small amount of a neoagarohexaose during hydrolysis of agarose, indicating that the enzyme is a β-agarase.
( Osamu Ariga ),( Naoki Okamoto ),( Naomi Harimoto ),( Kiyohiko Nakasaki ) 한국미생물 · 생명공학회 2014 Journal of microbiology and biotechnology Vol.24 No.1
α-Neoagarooligosaccharide (α-NAOS) hydrolase was purified from Cellvibrio sp. OA-2007 by using chromatographic techniques after hydroxyapatite adsorption. The molecular masses of α-NAOS hydrolase estimated using SDS-PAGE and gel filtration chromatography were 40 and 93 kDa, respectively, and the optimal temperature and pH for the enzyme activity were 32ºC and 7.0-7.2. α-NAOS hydrolase lost 43% of its original activity when incubated at 35ºC for 30 min. The enzyme hydrolyzed neoagarobiose, neoagarotetraose, and neoagarohexaose to galactose, agarotriose, and agaropentaose, respectively, and produced 3,6-anhydro-L-galactose concomitantly; however, it did not degrade agarose.
Observation of a first ν<sub>τ</sub> candidate event in the OPERA experiment in the CNGS beam
Agafonova, N.,Aleksandrov, A.,Altinok, O.,Ambrosio, M.,Anokhina, A.,Aoki, S.,Ariga, A.,Ariga, T.,Autiero, D.,Badertscher, A.,Bagulya, A.,Bendhabi, A.,Bertolin, A.,Besnier, M.,Bick, D.,Boyarkin, V.,Boz North-Holland Pub. Co 2010 Physics letters: B Vol.691 No.3
The OPERA neutrino detector in the underground Gran Sasso Laboratory (LNGS) has been designed to perform the first detection of neutrino oscillations in direct appearance mode through the study of the ν<SUB>μ</SUB>->ν<SUB>τ</SUB> channel. The hybrid apparatus consists of an emulsion/lead target complemented by electronic detectors and it is placed in the high energy long-baseline CERN to LNGS beam (CNGS) 730 km away from the neutrino source. Runs with CNGS neutrinos were successfully carried out in 2008 and 2009. After a brief description of the beam, the experimental setup and the procedures used for the analysis of the neutrino events, we describe the topology and kinematics of a first candidate ν<SUB>τ</SUB> charged-current event satisfying the kinematical selection criteria. The background calculations and their cross-check are explained in detail and the significance of the event is assessed.
Evidence forνμ→ντappearance in the CNGS neutrino beam with the OPERA experiment
Agafonova, N.,Aleksandrov, A.,Anokhina, A.,Aoki, S.,Ariga, A.,Ariga, T.,Asada, T.,Autiero, D.,Ben Dhahbi, A.,Badertscher, A.,Bender, D.,Bertolin, A.,Bozza, C.,Brugnera, R.,Brunet, F.,Brunetti, G.,Buon American Physical Society 2014 PHYSICAL REVIEW D - Vol.89 No.5
Final results of the search for νμ → νe oscillations with the OPERA detector in the CNGS beam
Agafonova, N.,Aleksandrov, A.,Anokhina, A.,Aoki, S.,Ariga, A.,Ariga, T.,Bertolin, A.,Bozza, C.,Brugnera, R.,Buonaura, A.,Buontempo, S.,Chernyavskiy, M.,Chukanov, A.,Consiglio, L.,D’Ambrosio, N.,De Lel Institute of Physics Pub 2018 The journal of high energy physics Vol.2018 No.6
Final Results of the OPERA Experiment on ντ Appearance in the CNGS Neutrino Beam
Agafonova, N.,Alexandrov, A.,Anokhina, A.,Aoki, S.,Ariga, A.,Ariga, T.,Bertolin, A.,Bozza, C.,Brugnera, R.,Buonaura, A.,Buontempo, S.,Chernyavskiy, M.,Chukanov, A.,Consiglio, L.,D’Ambrosio, N.,De Lell American Physical Society 2018 Physical review letters Vol.120 No.21
<P>The OPERA experiment was designed to study nu mu -> nu tau oscillations in the appearance mode in the CERN to Gran Sasso Neutrino beam (CNGS). In this Letter, we report the final analysis of the full data sample collected between 2008 and 2012, corresponding to 17.97 x 10(19) protons on target. Selection criteria looser than in previous analyses have produced ten nu(tau) candidate events, thus reducing the statistical uncertainty in the measurement of the oscillation parameters and of nu(tau) properties. A multivariate approach for event identification has been applied to the candidate events and the discovery of nu(tau) appearance is confirmed with an improved significance level of 6.1 sigma. |Delta m(32)(2)| has been measured, in appearance mode, with an accuracy of 20%. The measurement of the nu(tau) charged-current cross section, for the first ti me with a negligible contamination from p(z), and the first direct evidence for the nu(tau) lepton number are also reported.</P>