5 research outputs found
Highly Ordered 3D Graphene-Based Polymer Composite Materials Fabricated by “Particle-Constructing” Method and Their Outstanding Conductivity
The fabrication of graphene-based
polymer composite materials is of interest and significance from an
academic and an application viewpoint. The widely used method to obtain
such composites was liquid-phase blend of graphene nanosheets (GNSs)
and polymer solutions followed by casting or heat pressing. Until
now, the challenge of dispersing the GNSs uniformly in the polymer
matrix to form controllable and regular structure still remains. Here,
we developed a unique “particle-constructing” method
for fabricating highly ordered 3D graphene-based polymer composite
materials, throughout which the GNSs formed intact, uniform and well-defined
network structure. The strategy contains two steps: wrapping polymer
microspheres with GNSs and mold-compressing them at room temperature,
followed by an appropriate heat treatment. The composite materials
exhibited outstanding electrical properties involving extremely low
percolation threshold and much higher conductivity. The method can
be easily extended to fabricate highly ordered GNS aerogels and more
GNS-based composite materials. The results represent an important
step toward developing GNS-based composite materials with high performance
Presentation2_Ubiquitous conservative interaction patterns between post-spliced introns and their mRNAs revealed by genome-wide interspecies comparison.pdf
Introns, as important vectors of biological functions, can influence many stages of mRNA metabolism. However, in recent research, post-spliced introns are rarely considered. In this study, the optimal matched regions between introns and their mRNAs in nine model organism genomes were investigated with improved Smith–Waterman local alignment software. Our results showed that the distributions of mRNA optimal matched frequencies were highly consistent or universal. There are optimal matched frequency peaks in the UTR regions, which are obvious, especially in the 3′-UTR. The matched frequencies are relatively low in the CDS regions of the mRNA. The distributions of the optimal matched frequencies around the functional sites are also remarkably changed. The centers of the GC content distributions for different sequences are different. The matched rate distributions are highly consistent and are located mainly between 60% and 80%. The most probable value of the optimal matched segments is about 20 bp for lower eukaryotes and 30 bp for higher eukaryotes. These results show that there are abundant functional units in the introns, and these functional units are correlated structurally with all kinds of sequences of mRNA. The interaction between the post-spliced introns and their corresponding mRNAs may play a key role in gene expression.</p
Presentation3_Ubiquitous conservative interaction patterns between post-spliced introns and their mRNAs revealed by genome-wide interspecies comparison.pdf
Introns, as important vectors of biological functions, can influence many stages of mRNA metabolism. However, in recent research, post-spliced introns are rarely considered. In this study, the optimal matched regions between introns and their mRNAs in nine model organism genomes were investigated with improved Smith–Waterman local alignment software. Our results showed that the distributions of mRNA optimal matched frequencies were highly consistent or universal. There are optimal matched frequency peaks in the UTR regions, which are obvious, especially in the 3′-UTR. The matched frequencies are relatively low in the CDS regions of the mRNA. The distributions of the optimal matched frequencies around the functional sites are also remarkably changed. The centers of the GC content distributions for different sequences are different. The matched rate distributions are highly consistent and are located mainly between 60% and 80%. The most probable value of the optimal matched segments is about 20 bp for lower eukaryotes and 30 bp for higher eukaryotes. These results show that there are abundant functional units in the introns, and these functional units are correlated structurally with all kinds of sequences of mRNA. The interaction between the post-spliced introns and their corresponding mRNAs may play a key role in gene expression.</p
Presentation1_Ubiquitous conservative interaction patterns between post-spliced introns and their mRNAs revealed by genome-wide interspecies comparison.zip
Introns, as important vectors of biological functions, can influence many stages of mRNA metabolism. However, in recent research, post-spliced introns are rarely considered. In this study, the optimal matched regions between introns and their mRNAs in nine model organism genomes were investigated with improved Smith–Waterman local alignment software. Our results showed that the distributions of mRNA optimal matched frequencies were highly consistent or universal. There are optimal matched frequency peaks in the UTR regions, which are obvious, especially in the 3′-UTR. The matched frequencies are relatively low in the CDS regions of the mRNA. The distributions of the optimal matched frequencies around the functional sites are also remarkably changed. The centers of the GC content distributions for different sequences are different. The matched rate distributions are highly consistent and are located mainly between 60% and 80%. The most probable value of the optimal matched segments is about 20 bp for lower eukaryotes and 30 bp for higher eukaryotes. These results show that there are abundant functional units in the introns, and these functional units are correlated structurally with all kinds of sequences of mRNA. The interaction between the post-spliced introns and their corresponding mRNAs may play a key role in gene expression.</p
Alcohol-Tolerant Platinum Electrocatalyst for Oxygen Reduction by Encapsulating Platinum Nanoparticles inside Nitrogen-Doped Carbon Nanocages
Pt-based electrocatalysts
are the most popular for direct alcohol fuel cells, but their performances
easily deteriorate for the oxygen reduction reaction (ORR) at the
cathode because of the alcohol crossover effect. Herein, we report
the novel Pt electrocatalyst encapsulated inside nitrogen-doped carbon
nanocages (Pt@NCNC), which presents excellent alcohol-tolerant ORR
activity and durability in acidic media, far superior to the Pt counterpart
immobilized outside the nanocages (Pt/NCNC). The superb performance
is correlated with the molecule-sieving effect of the micropores penetrating
through the shells of the nanocages, which admit the small-sized oxygen
and ions but block the large-sized alcohols into the nanocages. This
mechanism is confirmed by examining the size dependence of ORR and
alcohol oxidation activities by regulating the micropores sizes. This
study provides a promising strategy to develop the superior alcohol-tolerant
Pt-based ORR electrocatalyst in acidic media