45 research outputs found
Supplemental Material - METTL3-mediated m6A modification of lncRNA SNHG3 accelerates gastric cancer progression by modulating miR-186-5p/cyclinD2 axis
Supplemental Material for METTL3-mediated m6A modification of lncRNA SNHG3 accelerates gastric cancer progression by modulating miR-186-5p/cyclinD2 axis by Guo Ji, Xiu Wang and Hao Xi in International Journal of Immunopathology and Pharmacology.</p
Ultralong, Small-Diameter TiO<sub>2</sub> Nanotubes Achieved by an Optimized Two-Step Anodization for Efficient Dye-Sensitized Solar Cells
An
optimized two-step anodization is developed to fabricate ultralong,
small-diameter TiO<sub>2</sub> nanotubes, that is, with tube length
of up to 31 μm and pore diameter of about 35 nm in this work.
This overcomes the length limitation of small diameter tubes that
usually presents in conventional one-step anodization. The small tubes
with lengths of 23 μm yield a conversion efficiency of 5.02%
in dye-sensitized solar cells under nonoptimized conditions
Computer Study of Chromatographic Separation Process: A Monte Carlo Study of H‑Shaped and Linear Homopolymers in Good Solvent
The partitioning of linear (L) and
H-shaped polymers between bulk
solvent and narrow pores with inert and attractive walls and the conformational
behavior of chains in pores was studied by Monte Carlo simulations.
The polymer chains were modeled as self-avoiding walks in a good solvent.
The concentration profiles in the pores, partition coefficients <i>K</i><sub>H</sub> and <i>K</i><sub>L</sub>, and various
structural characteristics were calculated as functions of pore size
and interaction parameter ε, ranging from 0 to −0.26. <i>K</i><sub>H</sub> is higher than <i>K</i><sub>L</sub> in pores with nonattractive walls, but the difference decreases
with increasing |ε|. Both partition coefficients equal for ε*
ca. −0.2, and later their sequence inverts. ε* depends
only slightly on chain architecture and chain length. The results
are important from the experimental point of view because they show
that the improperly chosen experimental conditions can deteriorate
SEC analysis of branched samples
Data_Sheet_1_Wind loss model for the thick canopies of orchard trees based on accurate variable spraying.ZIP
Variable application by wind is an efficient application technology recommended by the Food and Agriculture Organization (FAO) of the United Nations that can effectively improve the deposition effect of liquid medicine in a canopy and reduce droplet drift. In view of the difficulty of modelling wind forces in orchard tree canopies and the lack of a wind control model, the wind loss model for a canopy was studied. First, a three-dimensional wind measurement test platform was built for an orchard tree canopy. The orchard tree was located in three-dimensional space, and the inner leaf areas of the orchard tree canopy and the wind force in different areas were measured. Second, light detection and ranging (LiDAR) point cloud data of the orchard tree canopy were obtained by LiDAR scanning. Finally, classic regression, partial least squares regression (PLSR), and back propagation (BP) neural network algorithms were used to build wind loss models in the canopy. The research showed that the BP neural network algorithm can significantly improve the fitting accuracy of the model. Under different fan speeds of 1,381 r/min, 1,502 r/min, and 1,676 r/min, the coefficient of determination (R2) of the model were 81.78, 72.85, and 69.20%, respectively, which were 19.38, 7.55, and 12.3% higher than those of the PLSR algorithm and 21.48, 22.25, and 24.3% higher than those of multiple regression analysis. The comparison showed that the BP neural network algorithm obtains the highest model accuracy, but because the model is not intuitive, PLSR has the advantages of intuitive and simple models in the three algorithms. In practical applications, the wind loss model based on a BP neural network or PLSR can be selected according to the operational requirements and software and hardware conditions. This study can provide a basis for wind control in precise variable spraying and promote the development of wind control technologies.</p
Divergent Generation of the Difluoroalkyl Radical and Difluorocarbene via Selective Cleavage of C–S Bonds of the Sulfox-CF<sub>2</sub>SO<sub>2</sub>Ph Reagent
A new
difluoroalkylation reagent Sulfox-CF2SO2Ph bearing
both sulfoximine and sulfone moieties was prepared from
commercially available SulfoxFluor and PhSO2CF2H. On one hand, the Sulfox-CF2SO2Ph reagent
could act as a (phenylsulfonyl)difluoromethyl radical source under
photoredox catalysis, in which the arylsulfoximidoyl group is selectively
removed. On the other hand, under basic conditions, Sulfox-CF2SO2Ph could serve as a difluorocarbene precursor
for S- and O-difluoromethylations with S- and O-nucleophiles, respectively,
in which the phenylsulfonyl group in Sulfox-CF2SO2Ph is selectively removed (followed by α-elimination of the
arylsulfoximidoyl group)
Influence of the Chain Architecture and the Presence of End-Groups or Branching Units Chemically Different from Repeating Structural Units on the Critical Adsorption Point in Liquid Chromatography
The
critical adsorption point (CAP) of linear and star-shaped polymers
was investigated by normal phase and reversed phase liquid chromatography
(NPLC and RPLC) and computer simulation. Three sets of polystyrenes
(PS) differing in chain architecture and chemically distinct groups
were prepared: linear PS (<i>sec</i>-butyl and hydrogen
end group), 2-arm PS (linear, two <i>sec</i>-butyl end groups
and one silyl group in the middle of the chain) and 4-arm star-shaped
PS (four <i>sec</i>-butyl end groups and one silyl group
in the center of the star). It was found that the column temperature
at CAP, <i>T</i><sub>CAP</sub> (linear PS) = <i>T</i><sub>CAP</sub> (2-arm PS) > <i>T</i><sub>CAP</sub> (4-arm
PS) in both RPLC and NPLC which can be attributed to the variation
in chain architecture. However, the elution times at CAP of three
polymers are all different: In NPLC, <i>t</i><sub>E,CAP</sub> (linear) > <i>t</i><sub>E,CAP</sub> (2-arm PS) > <i>t</i><sub>E,CAP</sub> (4-arm PS) while in RPLC, <i>t</i><sub>E,CAP</sub> (4-arm PS) > <i>t</i><sub>E,CAP</sub> (2-arm
PS) > <i>t</i><sub>E,CAP</sub> (linear). The variation
of <i>t</i><sub>E,CAP</sub> can be explained by the contribution
of
the chemically distinct groups. The computer simulation results are
in good agreement with the chromatography experiments results and
support the interpretation of experimental data
Recyclable Nanoscale Zero Valent Iron Doped g‑C<sub>3</sub>N<sub>4</sub>/MoS<sub>2</sub> for Efficient Photocatalysis of RhB and Cr(VI) Driven by Visible Light
Photocatalytic materials
for environmental remediation of organic
pollution and heavy metals require not only a strong visible light
response and high photocatalytic performance, but also the regeneration
and reuse of catalysts. In this work, a ternary hybrid structure material
of a nanoscale zero valent iron (Fe<sup>0</sup>) doped g-C<sub>3</sub>N<sub>4</sub>/MoS<sub>2</sub> layered structure (GCNFM) was synthesized
by a facile strategy. Compared with the pure GCN, GCNM, and Fe-GCN,
the photodegradation efficiency of the GCNFM toward the RhB and Cr(VI)
under visible light is considerably enhanced, to 98.2% for RhB and
91.4% for Cr(VI), respectively. In addition, the reaction rate constants
(K<sub>RhB</sub> and K<sub>Cr</sub>) of GCNFM are much higher than
those of GCN, GCNM, and Fe-GCN, which is attributed to the fact that
Fe<sup>0</sup> and MoS<sub>2</sub> composited with GCNM promote the
separation of photogenerated electron–hole pairs. Moreover,
with the loading of MoS<sub>2</sub> and/or Fe<sup>0</sup>, the holes
could displace the <sup>•</sup>O<sup>2–</sup> as the
main reactive oxygen species in GCN. GCNFM maintains an efficient
degradation ability to both RhB and Cr(VI) after several cycles, in
spite of the fact that normally Fe<sup>0</sup> will be consumed and
deactivated with the reduction proceeding as previously reported.
This suggests that the photogenerated electrons, in response, can
reduce the Fe(III)/Fe(II) to Fe<sup>0</sup>, inducing regeneration
and reuse of Fe<sup>0</sup>. We anticipate this work can provide a
good example for the design of efficient, visible light driven, and
recyclable photocatalysts for environmental remediation of both organic
pollution and heavy metals
Synthesis and Adsorption Properties of Hierarchically Ordered Nanostructures Derived from Porous CaO Network
Using
the porous framework of CaO as templates and reagents, we explored
a surfactant-free and economical method for preparing calcium silicate
hydrate (CSH) hierarchically ordered nanostructures. Incorporation
of SiO<sub>2</sub> nanoparticles into the CaO framework, followed
by a reaction assisted by hydrothermal treatment, resulted in the
formation of CSH with well-defined morphologies. The structural features
of CSH were characterized by 3-D hierarchical networks, wherein nanofibers
assembled to form nanosheets, and nanosheets assembled to form hierarchically
ordered structures. Investigation of the crystal growth mechanism
indicated that the key to forming the CSH ordered assembly structure
was confining the Ca/Si ratio within a small range. Nonclassic oriented
aggregation mechanism was used to describe the crystal growth of nanosheets,
while the porous CaO framework served as template/reagents responsible
for the formation of hierarchical structures. The resulting CSH adsorbent
exhibited better performance in removing Pb(II) compared with other
types of random CSH adsorbents. Additionally, the hierarchical structure
of CSH provided more pores and active sites as support for other active
functional materials such as zerovalent iron (Fe<sup>0</sup>). As-produced
CSH@Fe nanocomposite with self-supported structures displayed high
capacities for removal of Pb(II) after five adsorption–desorption
cycles, and high capacities for other heavy metal ions (Cu<sup>2+</sup>, Cd<sup>2+</sup>, and Cr<sub>2</sub>O<sub>7</sub><sup>2–</sup>) and organic contaminants
Enhancement of the heat conduction performance of boron nitride/cellulosic fibre insulating composites - Fig 2
<p>(a)FTIR spectra and (b)TGA curves of pristine h-BN and surface modified h-BN.</p