2,184 research outputs found
N-[(E)-4-Pyridylmethylene]-4-[(E)-4-(4-pyridylmethyleneamino)benzyl]aniline tetrahydrate
The title compound, C25H20N4·4H2O, crystallizes with the organic molecule lying on a twofold rotation axis through the methylene bridge C atom; there are also two water molecules in the asymmetric unit. The crystal structure is stabilized by C—H⋯O, O—H⋯O and O—H⋯N hydrogen bonds, linking the water molecules to each other and to the pyridine N atom
Edge-aware Feature Aggregation Network for Polyp Segmentation
Precise polyp segmentation is vital for the early diagnosis and prevention of
colorectal cancer (CRC) in clinical practice. However, due to scale variation
and blurry polyp boundaries, it is still a challenging task to achieve
satisfactory segmentation performance with different scales and shapes. In this
study, we present a novel Edge-aware Feature Aggregation Network (EFA-Net) for
polyp segmentation, which can fully make use of cross-level and multi-scale
features to enhance the performance of polyp segmentation. Specifically, we
first present an Edge-aware Guidance Module (EGM) to combine the low-level
features with the high-level features to learn an edge-enhanced feature, which
is incorporated into each decoder unit using a layer-by-layer strategy.
Besides, a Scale-aware Convolution Module (SCM) is proposed to learn
scale-aware features by using dilated convolutions with different ratios, in
order to effectively deal with scale variation. Further, a Cross-level Fusion
Module (CFM) is proposed to effectively integrate the cross-level features,
which can exploit the local and global contextual information. Finally, the
outputs of CFMs are adaptively weighted by using the learned edge-aware
feature, which are then used to produce multiple side-out segmentation maps.
Experimental results on five widely adopted colonoscopy datasets show that our
EFA-Net outperforms state-of-the-art polyp segmentation methods in terms of
generalization and effectiveness.Comment: 20 pages 8 figure
Effective-stress finite element analysis of spudcan penetration with lattice leg in clay
10.1063/1.4826009AIP Conference Proceedings15582337-234
Studying antibiotic–membrane interactions via X-ray diffraction and fluorescence microscopy
AbstractAntibiotic drug resistance is a serious issue for the treatment of bacterial infection. Understanding the resistance to antibiotics is a key issue for developing new drugs. We used penicillin and sulbactam as model antibiotics to study their interaction with model membranes. Cholesterol was used to target the membrane for comparison with the well-known insertion model. Lamellar X-ray diffraction (LXD) was used to determine membrane thickness using successive drug-to-lipid molar ratios. The aspiration method for a single giant unilamellar vesicle (GUV) was used to monitor the kinetic binding process of antibiotic–membrane interactions in an aqueous solution. Both penicillin and sulbactam are found positioned outside the model membrane, while cholesterol inserts perpendicularly into the hydrophobic region of the membrane in aqueous solution. This result provides structural insights for understanding the antibiotic–membrane interaction and the mechanism of antibiotics
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