1,738 research outputs found
1′-Acetyl-3-phenyl-6-oxa-4-thia-2-azaÂspiroÂ[bicycloÂ[3.2.0]hept-2-ene-7,3′-indolin]-2′-one
In the title indoline compound, C19H14N2O3S, the pyrrolidine ring adopts an envelope conformation with the four-connected (spiro) C atom as the flap [displacement = 0.148 (3) Å]. The mean plane formed through the indoline unit is inclined at dihedral angles of 89.92 (16) and 59.54 (12)° with the thiaÂzole and phenyl rings, respectively; the dihedral angle between the latter rings is 9.55 (14)°. In the crystal, pairs of interÂmolecular C—H⋯O hydrogen bonds link neighbouring molÂecules into inversion dimers, producing R
2
2(6) hydrogen-bond ring motifs. Weak interÂmolecular C—H⋯π as well as π–π interÂactions [centroid–centroid distance = 3.4041 (15) Å] further consolidate the crystal structure
Radiative decays of the heavy-quark-spin molecular partner of
With the assumptions that the discovered at LHCb is a
hadronic molecule, using a nonrelativistic effective field theory we calculate
the radiative partial widths of with being
a shallow bound state and the heavy-quark-spin partner of
. The rescattering effect with the pole is
taken into account. The results show that the isoscalar
rescattering can increase the tree-level decay width of by about , while decrease that of
by a similar amount. The two-body
partial decay widths of the into and
are also calculated, and the results are about and
, respectively. Considering that the needs to be
reconstructed from the or final state in an experimental
measurement, the four-body partial widths of the into
and are explicitly calculated, and we find that
the interference effect between different intermediate states is
small. The total radiative decay width of the is predicted to be
about . Adding the hadronic decay widths of , the total width of the is finally predicted to be
keV.Comment: 27 pages, 13 figures. arXiv admin note: text overlap with
arXiv:2211.0247
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Water-Soluble Flexible Organic Frameworks That Include and Deliver Proteins.
Four water-soluble hydrazone-based three-dimensional (3D) flexible organic frameworks FOF-1-4 have been synthesized from a semirigid tetracationic tetraaldehyde and four flexible dihydrazides. 1H NMR spectroscopy indicated the quantitative formation of FOF-1-4 in D2O, while dynamic light scattering experiments revealed that, depending on the concentration, these porous frameworks display hydrodynamic diameters ranging from 50 to 120 nm. The porosity of the frameworks is confirmed by ethanol vapor adsorption experiments of the solid samples as well as the high loading capacity for a 2.3 nm porphyrin guest in water. The new water-soluble frameworks exhibit low cytotoxicity and form inherent pores with diameters of 5.3 or 6.7 nm, allowing rapid inclusion of proteins such as bovine serum albumin and green and orange fluorescent proteins, and efficient delivery of the proteins into normal and cancer cells. Flow cytometric analysis reveals percentages of the delivered cells up to 99.8%
Surgery combined with radiotherapy for the treatment of solitary plasmacytoma of the rib: a case report and review of the literature
Electron interaction-driven insulating ground state in Bi2Se3 topological insulators in the two dimensional limit
We report a transport study of ultrathin Bi2Se3 topological insulators with
thickness from one quintuple layer to six quintuple layers grown by molecular
beam epitaxy. At low temperatures, the film resistance increases
logarithmically with decreasing temperature, revealing an insulating ground
state. The sharp increase of resistance with magnetic field, however, indicates
the existence of weak antilocalization, which should reduce the resistance as
temperature decreases. We show that these apparently contradictory behaviors
can be understood by considering the electron interaction effect, which plays a
crucial role in determining the electronic ground state of topological
insulators in the two dimensional limit.Comment: 4 figure
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