A5073951252- Nuclear physics research studies
- Nuclear Physics and Applications
- Astronomical and nuclear sciences
- Enzyme Catalysis and Immobilization
- Microbial bioremediation and biosurfactants
- Atomic and Molecular Physics
- Amino Acid Enzymes and Metabolism
- Particle accelerators and beam dynamics
- Atomic and Subatomic Physics Research
- Quantum Chromodynamics and Particle Interactions
- Nuclear reactor physics and engineering
- Enzyme-mediated dye degradation
- Enzyme Structure and Function
- Radiation Detection and Scintillator Technologies
- Astro and Planetary Science
- Particle Detector Development and Performance
- Enzyme Production and Characterization
- Microbial Community Ecology and Physiology
- Neutrino Physics Research
- Advanced Chemical Physics Studies
- Pancreatic function and diabetes
- Metal-Catalyzed Oxygenation Mechanisms
- Particle physics theoretical and experimental studies
- Environmental Chemistry and Analysis
- Genomics and Phylogenetic Studies
University of Stuttgart
2014-2024
Michigan State University
2014-2024
National Superconducting Cyclotron Laboratory
2010-2020
Ball (France)
2014
Moscow Engineering Physics Institute
2014
Astronomy and Space
2003-2012
The Ohio State University
2010
Los Alamos National Laboratory
2009
Bulgarian Academy of Sciences
2009
University of Cologne
2009
The taxonomic position of Pseudomonas sp. B13 T , isolated as a 3-chlorobenzoate-degrading organism and used for several groundbreaking studies on the enzymology genetics degradative pathway haloaromatic compounds, was studied in detail. previously performed physiological studies, detection ubiquinone Q-9, polyamine pattern with putrescine spermidine major polyamines, fatty acid profile C 18 : 1 ω 7 c summed feature 3 16 0 quantitatively most important constituents 16S rRNA gene sequence...
Under anaerobic conditions the sulfonated azo dye Mordant Yellow 3 was reduced by biomass of a bacterial consortium grown aerobically with 6-aminonaphthalene-2-sulfonic acid. Stoichiometric amounts aromatic amines 6-aminonaphthalene-2-sulfonate and 5-aminosalicylate were generated excreted into medium. After re-aeration culture, these mineralized different members culture. Thus, total degradation achieved using an alternating anaerobic-aerobic treatment. The ability mixed culture to reduce...
The addition of quinoid redox mediators to anaerobically incubated cultures various taxonomically different bacterial species resulted in significantly increased reduction rates for the azo dye amaranth. From quinones tested, generally anthraquinone-2-sulfonate (AQS) and lawsone (2-hydroxy-1,4-naphthoquinone) caused highest increase azoreductase activities. effects AQS were studied greater detail with Sphingomonas xenophaga BN6 Escherichia coli K12. Both strains reduced under anaerobic...
ABSTRACT A flavin reductase, which is naturally part of the ribonucleotide reductase complex Escherichia coli , acted in cell extracts recombinant E. strains under aerobic and anaerobic conditions as an “azo reductase.” The transfer plasmid, resulted constitutive expression high levels activity increased reduction rate for different industrially relevant sulfonated azo dyes vitro almost 100-fold. gene ( fre ) was transferred to Sphingomonas sp. strain BN6, a bacterial able degrade...
The effect of different artificial redox mediators on the anaerobic reduction azo dyes by Sphingomonas sp. strain BN6 or activated sludge was investigated. Reduction rates were greatly enhanced in presence sulfonated anthraquinones. For BN6, both cytoplasmic and membrane-bound reductase activities shown.
The anaerobic reduction of azo dyes by Sphingomonas sp. strain BN6 was analyzed. Aerobic conversion 2-naphthalenesulfonate (2NS) cells stimulated the subsequent sulfonated dye amaranth at least 10-fold. In contrast, in crude extracts, reductase activity not stimulated. A mutant which able to metabolize 2NS showed increased rates only when were resuspended culture supernatant 2NS-grown wild-type cells. same increase could be observed with different bacterial strains. This suggested presence...
Stimulation of transcription from positively regulated promoters involves regulatory proteins that have been activated, generally as a consequence binding low molecular weight effector molecules. To define essential structural features effectors for one acting gene regulator, the xylS-encoded protein, which activates TOL plasmid meta-cleavage pathway operon promoters, activities wide range benzoate derivatives systematically analyzed, and mutant exhibiting altered specificities generated...
A candidate resonant tetraneutron state is found in the missing-mass spectrum obtained double-charge-exchange reaction ^{4}He(^{8}He,^{8}Be) at 186 MeV/u. The energy of 0.83±0.65(stat)±1.25(syst) MeV above threshold four-neutron decay with a significance level 4.9σ. Utilizing large positive Q value (^{8}He,^{8}Be) reaction, an almost recoilless condition system was achieved so as to obtain weakly interacting efficiently.
We perform the first direct mass measurements of neutron-rich calcium isotopes beyond neutron number 34 at RIKEN Radioactive Isotope Beam Factory by using time-of-flight magnetic-rigidity technique. The atomic excesses ^{55-57}Ca are determined for time to be -18650(160), -13510(250), and -7370(990) keV, respectively. examine emergence magicity N=34 based on new masses. masses provide experimental evidence appearance a sizable energy gap between 2p_{1/2} 1f_{5/2} orbitals in ^{54}Ca,...
The discovery of the important neutron-rich nucleus 6020Ca40 and seven others near limits nuclear stability is reported from fragmentation a 345 MeV/u 70Zn projectile beam on 9Be targets at radioactive ion-beam factory RIKEN Nishina Center. produced fragments were analyzed unambiguously identified using BigRIPS two-stage in-flight separator. eight new nuclei discovered, 47P, 49S, 52Cl, 54Ar, 57K, 59,60Ca, 62Sc, are most isotopes respective elements. In addition, one event consistent with 59K...
Less than a year after its opening, the Facility for Rare Isotope Beams produced five never-before-seen isotopes observation, success that researchers say highlights discovery potential of facility.
Nuclei with magic numbers serve as important benchmarks in nuclear theory. In addition, neutron-rich nuclei play an role the astrophysical rapid neutron-capture process ($r$ process). $^{78}\mathrm{N}\mathrm{i}$ is only doubly nucleus that also waiting point $r$ process, and serves a major bottleneck synthesis of heavier elements. The half-life has been experimentally deduced for first time at Coupled Cyclotron Facility National Superconducting Laboratory Michigan State University, was found...
ABSTRACT The gene coding for an aerobic azoreductase was cloned from Xenophilus azovorans KF46F (formerly Pseudomonas sp. strain KF46F), which previously shown to grow with the carboxylated azo compound 1-(4′-carboxyphenylazo)-2-naphthol (carboxy-Orange II) as sole source of carbon and energy. deduced amino acid sequence encoded a protein molecular weight 30,278 showed no significant homology sequences currently deposited at relevant data bases. A presumed NAD(P)H-binding site identified in...
Mono- and disulfonated naphthalene derivatives with a hydroxy group in ortho-position to an amino are commonly occurring products of the anaerobic reduction azo dyes by microorganisms. These substituted o-aminohydroxybenzenes o-aminohydoxynaphthalenes oxygen-sensitive decompose under aerobic conditions. To evaluate their behavior conditions, 1-amino-2-hydroxynaphthalene-6-sulfonate [AHNS; product Sunset Yellow FCF (FD&C No.6, C.I. No. 15985)], 1-amino-2-hydroxynaphthalene-3,6-disulfonate...
A systematic survey for the presence of plasmids in 17 different xenobiotic-degrading Sphingomonas strains was performed. In almost all analyzed strains, two to five with sizes about 50 500 kb were detected by using pulsed-field gel electrophoresis. comparison plasmid preparations untreated or treated S1 nuclease suggested that, general, are circular. Hybridization experiments labeled gene probes that large involved degradation dibenzo-p-dioxin, dibenzofuran, and naphthalenesulfonates S....
Rare isotope beams of neutron-deficient 106,108,110Sn from the fragmentation 124Xe were employed in an intermediate-energy Coulomb excitation experiment. The measured B(E2,0(1)(+)-->2(1)(+)) values for 108Sn and 110Sn results obtained 106Sn show that transition strengths these nuclei are larger than predicted by current state-of-the-art shell-model calculations. This discrepancy might be explained contributions protons within Z = 50 shell to structure low-energy excited states this region.
Measurements of $\ensuremath{\beta}$-decay properties $A\ensuremath{\lesssim}110$ r-process nuclei have been completed at the National Superconducting Cyclotron Laboratory Michigan State University. half-lives for $^{105}\mathrm{Y}$, $^{106,107}\mathrm{Zr}$, and $^{111}\mathrm{Mo}$, along with $\ensuremath{\beta}$-delayed neutron emission probabilities $^{104}\mathrm{Y}$, $^{109,110}\mathrm{Mo}$ upper limits $^{103\ensuremath{-}107}\mathrm{Zr}$, $^{108,111}\mathrm{Mo}$ measured first time....
The decay of extremely neutron-deficient 45Fe has been studied in detail by means a novel type gaseous detector employing digital imaging to record tracks charged particles. two-proton radioactivity channel was clearly identified. For the first time, angular and energy correlations between two protons emitted from nuclear ground state were determined, indicating genuine three-body character this decay. half-life found be 2.6+/-0.2 ms observed 2p branching ratio is 70+/-4%.