2,532 research outputs found
Equivariant K-groups of spheres with actions of involutions
We calculate the R(G)-algebra structure on the reduced equivariant K-groups
of two-dimensional spheres on which a compact Lie group G acts as involutions.
In particular, the reduced equivariant K-groups are trivial if G is abelian,
which shows that the previous Y. Yang's calculation in [Yan95] is not true.Comment: 7 pages, AMS-LaTeX v1.
Quartet consistency count method for reconstructing phylogenetic trees
Among the distance based algorithms in phylogenetic tree reconstruction, the
neighbor-joining algorithm has been a widely used and effective method. We
propose a new algorithm which counts the number of consistent quartets for
cherry picking with tie breaking. We show that the success rate of the new
algorithm is almost equal to that of neighbor-joining. This gives an
explanation of the qualitative nature of neighbor-joining and that of
dissimilarity maps from DNA sequence data. Moreover, the new algorithm always
reconstructs correct trees from quartet consistent dissimilarity maps.Comment: 11 pages, 5 figure
On extensions of representations for compact Lie groups
Let be a closed normal subgroup of a compact Lie group such that
is connected. This paper provides a necessary and sufficient condition
for every complex representation of to be extendible to , and also for
every complex -vector bundle over the homogeneous space to be trivial.
In particular, we show that the condition holds when the fundamental group of
is torsion free.Comment: 10 pages, AMS-LaTeX v1.
Classification of Equivariant Complex Vector Bundles over a Circle
In this paper we characterize the fiber representations of equivariant
complex vector bundles over a circle and classify these bundles. We also treat
the triviality of equivariant complex vector bundles over a circle by
investigating the extensions of representations. As a corollary of our results,
we calculate the reduced equivariant K-group of a circle for any compact Lie
group.Comment: 15 pages, AMS-LaTeX v1.
Classification of equivariant real vector bundles over a circle
This is a continuation of the authors' previous work [math.AT/9910001] on
classification of equivariant complex vector bundles over a circle. In this
paper we classify equivariant real vector bundles over a circle with a compact
Lie group action, by characterizing the fiber representations of them, and by
using the result of the complex case. We also treat the triviality of them. The
basic phenomenon is similar to the complex case but more complicated here.Comment: 16 pages, AMS-LaTeX v1.
Neural Spectro-polarimetric Fields
Modeling the spatial radiance distribution of light rays in a scene has been
extensively explored for applications, including view synthesis. Spectrum and
polarization, the wave properties of light, are often neglected due to their
integration into three RGB spectral bands and their non-perceptibility to human
vision. Despite this, these properties encompass substantial material and
geometric information about a scene. In this work, we propose to model
spectro-polarimetric fields, the spatial Stokes-vector distribution of any
light ray at an arbitrary wavelength. We present Neural Spectro-polarimetric
Fields (NeSpoF), a neural representation that models the physically-valid
Stokes vector at given continuous variables of position, direction, and
wavelength. NeSpoF manages inherently noisy raw measurements, showcases memory
efficiency, and preserves physically vital signals, factors that are crucial
for representing the high-dimensional signal of a spectro-polarimetric field.
To validate NeSpoF, we introduce the first multi-view
hyperspectral-polarimetric image dataset, comprised of both synthetic and
real-world scenes. These were captured using our compact
hyperspectral-polarimetric imaging system, which has been calibrated for
robustness against system imperfections. We demonstrate the capabilities of
NeSpoF on diverse scenes
Indole and 3-indolylacetonitrile inhibit spore maturation in Paenibacillus alvei
<p>Abstract</p> <p>Background</p> <p>Bacteria use diverse signaling molecules to ensure the survival of the species in environmental niches. A variety of both Gram-positive and Gram-negative bacteria produce large quantities of indole that functions as an intercellular signal controlling diverse aspects of bacterial physiology.</p> <p>Results</p> <p>In this study, we sought a novel role of indole in a Gram-positive bacteria <it>Paenibacillus alvei </it>that can produce extracellular indole at a concentration of up to 300 μM in the stationary phase in Luria-Bertani medium. Unlike previous studies, our data show that the production of indole in <it>P. alvei </it>is strictly controlled by catabolite repression since the addition of glucose and glycerol completely turns off the indole production. The addition of exogenous indole markedly inhibits the heat resistance of <it>P. alvei </it>without affecting cell growth. Observation of cell morphology with electron microscopy shows that indole inhibits the development of spore coats and cortex in <it>P. alvei</it>. As a result of the immature spore formation of <it>P. alvei</it>, indole also decreases <it>P. alvei </it>survival when exposed to antibiotics, low pH, and ethanol. Additionally, indole derivatives also influence the heat resistance; for example, a plant auxin, 3-indolylacetonitrile dramatically (2900-fold) decreased the heat resistance of <it>P. alvei</it>, while another auxin 3-indoleacetic acid had a less significant influence on the heat resistance of <it>P. alvei</it>.</p> <p>Conclusions</p> <p>Together, our results demonstrate that indole and plant auxin 3-indolylacetonitrile inhibit spore maturation of <it>P. alvei </it>and that 3-indolylacetonitrile presents an opportunity for the control of heat and antimicrobial resistant spores of Gram-positive bacteria.</p
Characterization for Binding Complex Formation with Site-Directly Immobilized Antibodies Enhancing Detection Capability of Cardiac Troponin I
The enhanced analytical performances of immunoassays that employed site-directly
immobilized antibodies as the capture binders have been functionally characterized in terms of antigen-antibody complex formation on solid surfaces. Three antibody species specific to cardiac troponin I, immunoglobulin G (IgG), Fab, and F(ab′)2 were site-directly biotinylated within the hinge region and then immobilized via a streptavidin-biotin linkage. The new binders were more efficient capture antibodies in the immunoassays compared to randomly bound IgG, particularly, in the low antibody density range. The observed improvements could have resulted from controlled molecular orientation and also from flexibility, offering conditions suitable for binding complex formations
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