4,169 research outputs found
Heterotrophic nitrification and aerobic denitrification bacterium isolated from anaerobic/anoxic/oxic treatment system
A special strain of Alcaligenes denitrificans, designated as WY200811, with heterotrophic nitrification and aerobic denitrification ability was novel isolated from an anaerobic/anoxic/oxic treatment system and characterized. The average ammonia nitrogen (NH4+-N) and TN (total nitrogen) removal rates of the strain were 0.026 and 0.028 gN/g·Cell·h. Under the environmental conditions of 22% DO and C/N ratio of 5, the ultimate efficiencies of nitrification and denitrification were 57.0 and 57.3%, respectively. The pH in the medium was maintained between 6.0 and 7.0. The novel strain can rapidly reduce the ammonia to nitrogen gas without nitrite accumulation. The WY200811 can be used in a full-scale anaerobic/anoxic/oxic treatment system for efficiency in heterotrophic nitrification and aerobic denitrification.Key words: Heterotrophic nitrification and aerobic denitrification, Alcaligenes denitrificans, nitrogen balance
Structural Simplification of Bedaquiline: the Discovery of 3-(4-(N,N-dimethylaminomethyl)phenyl)quinoline Derived Antitubercular Lead Compounds
Bedaquiline (BDQ) is a novel and highly potent last-line antituberculosis drug that was approved by the US FDA in 2013. Owing to its stereo-structural complexity, chemical synthesis and compound optimization are rather difficult and expensive. This study describes the structural simplification of bedaquiline while preserving antitubercular activity. The compound's structure was split into fragments and reassembled in various combinations while replacing the two chiral carbon atoms with an achiral linkage instead. Four series of analogues were designed; these candidates retained their potent antitubercular activity at sub-microgram per mL concentrations against both sensitive and multidrug-resistant (MDR) Mycobacterium tuberculosis strains. Six out of the top nine MIC-ranked candidates were found to inhibit mycobacterial ATP synthesis activity with IC50 values between 20 and 40â
ÎŒm, one had IC50>66â
ÎŒm, and two showed no inhibition, despite their antitubercular activity. These results provide a basis for the development of chemically less complex, lower-cost bedaquiline derivatives and describe the identification of two derivatives with antitubercular activity against non-ATP synthase related targets
The Structure on Invariant Measures of generic diffeomorphisms
Let be an isolated non-trival transitive set of a generic
diffeomorphism f\in\Diff(M). We show that the space of invariant measures
supported on coincides with the space of accumulation measures of
time averages on one orbit. Moreover, the set of points having this property is
residual in (which implies the set of irregular points is also
residual in ). As an application, we show that the non-uniform
hyperbolicity of irregular points in with totally 0 measure
(resp., the non-uniform hyperbolicity of a generic subset in )
determines the uniform hyperbolicity of
Development of ă110ă texture in copper thin films
Author name used in this publication: C. H. Woo2001-2002 > Academic research: refereed > Publication in refereed journalVersion of RecordPublishe
Staggered local density-of-states around the vortex in underdoped cuprates
We have studied a single vortex with the staggered flux (SF) core based on
the SU(2) slave-boson theory of high superconductors. We find that
whereas the center in the vortex core is a SF state, as one moves away from the
core center, a correlated staggered modulation of the hopping amplitude
and pairing amplitude becomes predominant. We predict that in this
region, the local density-of-states (LDOS) exhibits staggered modulation when
measured on the bonds, which may be directly detected by STM experiments.Comment: 4 pages, 3 figure
A study on nitrogen removal efficiency of Pseudomonas stutzeri strains isolated from an anaerobic/anoxic/oxic wastewater treatment process
In order to improve the nitrogen removal efficiency in an anaerobic/anoxic/oxic treatment plant, a strain with high nitrification and denitrification capability was isolated from a specific anaerobic/anoxic/oxic treatment process. The characteristics of isolate were experimentally analyzed. By using the nitrogen balance method, the total nitrogen loss was calculated to be 40.1% (w/w) when the carbon source was citric acid with a C/N ratio of 5. Meanwhile, the isolated strain was identified by 16S rDNA to be a Pseudomonas stutzeri with a similarity of 99%. Varying the initial TN, the C/N, the pH value and the ambient temperature in the reaction system, the efficiency of nitrogen removal was studied. The results showed that the highest efficiency occurred when the C/N was 12, the pH value was 7 and the temperature was 32°C. The results were also compared to the practically monitoring data coming with a good agreement. Consequently, it is viable to improve the nitrogen removal efficiency by varying the reaction conditions
Numerical Jordan-Wigner approach for two dimensional spin systems
We present a numerical self consistent variational approach based on the
Jordan-Wigner transformation for two dimensional spin systems. We apply it to
the study of the well known quantum (S=1/2) antiferromagnetic XXZ system as a
function of the easy-axis anisotropy \Delta on a periodic square lattice. For
the SU(2) case the method converges to a N\'eel ordered ground state
irrespectively of the input density profile used and in accordance with other
studies. This shows the potential utility of the proposed method to investigate
more complicated situations like frustrated or disordered systems.Comment: Revtex, 8 pages, 4 figure
Designing spin-1 lattice models using polar molecules
We describe how to design a large class of always on spin-1 interactions
between polar molecules trapped in an optical lattice. The spin degrees of
freedom correspond to the hyperfine levels of a ro-vibrational ground state
molecule. Interactions are induced using a microwave field to mix ground states
in one hyperfine manifold with the spin entangled dipole-dipole coupled excited
states. Using multiple fields anistropic models in one, two, or three
dimensions, can be built with tunable spatial range. An illustrative example in
one dimension is the generalized Haldane model, which at a specific parameter
has a gapped valence bond solid ground state. The interaction strengths are
large compared to decoherence rates and should allow for probing the rich phase
structure of strongly correlated systems, including dimerized and gapped
phases.Comment: 24 pages, 5 figure
Is subchondral cyst an indicator for osteoblast dysfunction in knee osteoarthritis?
Free Paper Presentation Session 6 â Adult Joint Reconstruction: no. 6.5INTRODUCTION: Subchondral bone cyst (SBC) is a key radiological feature in advanced OA. The presence of SBC was reported in a relation to the risk of cartilage loss and total knee arthroplasty (TKA). Whilst the link between SBCs and bone dysmetabolism in hip OA was studied, their links in knee OA remain unknown. Therefore we try to elucidate the relationship between SBC and subchondral bone disturbance from tissue and cellular levels in ...postprin
Watch me, watch you: ritual participation increases in-group displays and out-group monitoring in children
© 2021 The Author(s). Collective rituals serve social functions for the groups that perform them, including identifying group members and signaling group commitment. A novel social group paradigm was used in an afterschool program (N = 60 4-11-year-olds) to test the influence of participating in a ritual task on in-group displays and out-group monitoring over repeated exposures to the group. The results demonstrate that ritual participation increases in-group displays (i.e., time spent displaying materials to in-group members) and out-group monitoring (i.e., time spent looking at out-group members) compared to a control task across three time points. This study provides evidence for the processes by which rituals may influence childrenâs behaviors toward in- and outgroup members and discusses implications for understanding the development of ritual cognition and behavior.American Psychological Foundation Elizabeth M. Koppitz Graduate Student Fellowship and the University of Texas at Austin Continuing Graduate Fellowship to N.J.W.; Economic and Social Research Council (ESRC) grant âRitual, Community, and Conflictâ (REF RES-060-25-0085) to C.H.L
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