1,377 research outputs found
5,7-Dihydroxy-3,6,8-trimethoxyflavone
The title compound (systematic name: 5,7-dihydroxy-3,6,8-trimethoxy-4H-chromen-4-one), C18H16O7, is a flavone that was isolated from Ainsliaea henryi. There are two molecules in the asymmetric unit, one of which has a disordered methoxy group [occupancy ratio 0.681 (9):0.319 (9)]. Both molecules have an intramolecular O—H⋯O hydrogen bond. In the crystal, molecules are linked into O—H⋯O hydrogen-bonded chains parallel to [110]
Anti-tumor effects of ephedrine and anisodamine on SKBR3 human breast cancer cell line
Background: To investigate the effects of ephedrine and anisodamine on the proliferation of human breast cancer.Materials and Methods: SKBR3 cell was treated with or without ephedrine and / or anisodamine, respectively. The trypan blue exclusion assay was used to determine cell numbers. Flow cytometry was used to assess cell cycle distribution and apoptosis. The concentration of cAMP and cyclin D1 was analyzed by enzyme-linked immunosorbent assay. Western blot was used to measure PKA.Results: Ephedrine and anisodamine inhibited cell proliferation and arrested SKBR3 cells at G0/G1 phases. Ephedrine and anisodamine increased the level of CD1 in SKBR3 cells. Furthermore, significant change in intracellular cAMP concentration was found in SKBR3 cells treated with ephedrine and anisodamine. The phosphorylation of PKA substrate was not activated after 48 hours of treatment with ephedrine and anisodamine.Conclusion: Ephedrine and anisodamine inhibit the proliferation of SKBR3 cells via a significantly change of intracellular cAMP concentration.Key words: anisodamine, breast cancer, cyclic adenosine monophosphate, ephedrine, proliferation Abbreviations: cAMP, cyclic adenosine monophosphate; TCM, traditional Chinese medicine; ELISA, enzyme-linked immunosorbent assay; CD1, cyclin D1; SNS, sympathetic nervous system
A dimeric sesquiterpene, gochnatiolide A
The title compound [systematic name: 5′a-hydroxy-1′,3,6,8′-tetrakis(methylene)-3a,4,5,5′,5′a,6,6′,6a,7,7′,7′a,8′,9a,9b,10′a,10′b-hexadecahydrospiro[azuleno[4,5-b]furan-9(2H),3′-[3H]benz[1,8]azuleno[4,5-b]furan]-2,2′,8,9′(1′H,3H,4′H)-tetrone acetone 0.92-solvate], C30H30O7·0.92C3H6O, is a dimeric sequiterpene formed by a cyclohexane system connecting two monomeric sesquiterpene lactone units of dehydrozaluzanin C. It was isolated from Ainsliaea henryi
Traceable Group-Wise Self-Optimizing Feature Transformation Learning: A Dual Optimization Perspective
Feature transformation aims to reconstruct an effective representation space
by mathematically refining the existing features. It serves as a pivotal
approach to combat the curse of dimensionality, enhance model generalization,
mitigate data sparsity, and extend the applicability of classical models.
Existing research predominantly focuses on domain knowledge-based feature
engineering or learning latent representations. However, these methods, while
insightful, lack full automation and fail to yield a traceable and optimal
representation space. An indispensable question arises: Can we concurrently
address these limitations when reconstructing a feature space for a
machine-learning task? Our initial work took a pioneering step towards this
challenge by introducing a novel self-optimizing framework. This framework
leverages the power of three cascading reinforced agents to automatically
select candidate features and operations for generating improved feature
transformation combinations. Despite the impressive strides made, there was
room for enhancing its effectiveness and generalization capability. In this
extended journal version, we advance our initial work from two distinct yet
interconnected perspectives: 1) We propose a refinement of the original
framework, which integrates a graph-based state representation method to
capture the feature interactions more effectively and develop different
Q-learning strategies to alleviate Q-value overestimation further. 2) We
utilize a new optimization technique (actor-critic) to train the entire
self-optimizing framework in order to accelerate the model convergence and
improve the feature transformation performance. Finally, to validate the
improved effectiveness and generalization capability of our framework, we
perform extensive experiments and conduct comprehensive analyses.Comment: 21 pages, submitted to TKDD. arXiv admin note: text overlap with
arXiv:2209.08044, arXiv:2205.1452
TwinTex: Geometry-aware Texture Generation for Abstracted 3D Architectural Models
Coarse architectural models are often generated at scales ranging from
individual buildings to scenes for downstream applications such as Digital Twin
City, Metaverse, LODs, etc. Such piece-wise planar models can be abstracted as
twins from 3D dense reconstructions. However, these models typically lack
realistic texture relative to the real building or scene, making them
unsuitable for vivid display or direct reference. In this paper, we present
TwinTex, the first automatic texture mapping framework to generate a
photo-realistic texture for a piece-wise planar proxy. Our method addresses
most challenges occurring in such twin texture generation. Specifically, for
each primitive plane, we first select a small set of photos with greedy
heuristics considering photometric quality, perspective quality and facade
texture completeness. Then, different levels of line features (LoLs) are
extracted from the set of selected photos to generate guidance for later steps.
With LoLs, we employ optimization algorithms to align texture with geometry
from local to global. Finally, we fine-tune a diffusion model with a multi-mask
initialization component and a new dataset to inpaint the missing region.
Experimental results on many buildings, indoor scenes and man-made objects of
varying complexity demonstrate the generalization ability of our algorithm. Our
approach surpasses state-of-the-art texture mapping methods in terms of
high-fidelity quality and reaches a human-expert production level with much
less effort. Project page: https://vcc.tech/research/2023/TwinTex.Comment: Accepted to SIGGRAPH ASIA 202
Self-Optimizing Feature Transformation
Feature transformation aims to extract a good representation (feature) space
by mathematically transforming existing features. It is crucial to address the
curse of dimensionality, enhance model generalization, overcome data sparsity,
and expand the availability of classic models. Current research focuses on
domain knowledge-based feature engineering or learning latent representations;
nevertheless, these methods are not entirely automated and cannot produce a
traceable and optimal representation space. When rebuilding a feature space for
a machine learning task, can these limitations be addressed concurrently? In
this extension study, we present a self-optimizing framework for feature
transformation. To achieve a better performance, we improved the preliminary
work by (1) obtaining an advanced state representation for enabling reinforced
agents to comprehend the current feature set better; and (2) resolving Q-value
overestimation in reinforced agents for learning unbiased and effective
policies. Finally, to make experiments more convincing than the preliminary
work, we conclude by adding the outlier detection task with five datasets,
evaluating various state representation approaches, and comparing different
training strategies. Extensive experiments and case studies show that our work
is more effective and superior.Comment: Under review of TKDE. arXiv admin note: substantial text overlap with
arXiv:2205.1452
Clinical features and surgical effect of vireoretinal diseases with contralateral blindness
AIM: To investigate the clinical characteristics and surgical results of vireoretinal diseases in 68 patients with contralateral blindness(solitary eye). <p>METHODS: A total of 68 patients(68 eyes)with contralateral blindness were enrolled in this retrospective consecutive study. The clinical characteristics, surgical procedures and temponade materials chosen, preoperative and postoperative visual acuity, complications and prognosis were analyzed. The follow-up ranged from 4 months to 5 years, with an average of(11.30±9.57)months. At the last follow-up, the surgical effects were evaluated.<p>RESULTS:After operation, visual acuity increased significantly. The number of eyes with vision of 0.05 or better increased from 22 eyes(32.4%)preoperative to 60 eyes(88.2%)postoperative, and that of 0.3 or better from 3 eyes(4.4%)to 37 eyes(54.4%). The best-corrected visual acuity before and after surgery also differed significantly(<i>t</i>=8.986, <i>P<</i>0.01). <p>CONCLUSION: With vitreoretinal surgery, visual impairment or loss due to vitreoretinal diseases can be avoided in most patients with contralateral blindness
Combining high-throughput micro-CT-RGB phenotyping and genome-wide association study to dissect the genetic architecture of tiller growth in rice
Manual phenotyping of rice tillers is time consuming and labor intensive and lags behind the rapid development of rice functional genomics. Thus, automated, non-destructive phenotyping of rice tiller traits at a high spatial resolution and high-throughput for large-scale assessment of rice accessions is urgently needed. In this study, we developed a high-throughput micro-CT-RGB (HCR) imaging system to non-destructively extract 730 traits from 234 rice accessions at 9 time points. We could explain 30% of the grain yield variance from 2 tiller traits assessed in the early growth stages. A total of 402 significantly associated loci were identified by GWAS, and dynamic and static genetic components were found across the nine time points. A major locus associated with tiller angle was detected at nine time points, which contained a major gene TAC1. Significant variants associated with tiller angle were enriched in the 3'-UTR of TAC1. Three haplotypes for the gene were found and rice accessions containing haplotype H3 displayed much smaller tiller angles. Further, we found two loci contained associations with both vigor-related HCR traits and yield. The superior alleles would be beneficial for breeding of high yield and dense planting
ANTI-TUMOR EFFECTS OF EPHEDRINE AND ANISODAMINE ON SKBR3 HUMAN BREAST CANCER CELL LINE
Background: To investigate the effects of ephedrine and anisodamine on the proliferation of human breast cancer.
Materials and Methods: SKBR3 cell was treated with or without ephedrine and / or anisodamine, respectively. The trypan blue exclusion assay was
used to determine cell numbers. Flow cytometry was used to assess cell cycle distribution and apoptosis. The concentration of cAMP and cyclin D1
was analyzed by enzyme-linked immunosorbent assay. Western blot was used to measure PKA.
Results: Ephedrine and anisodamine inhibited cell proliferation and arrested SKBR3 cells at G0/G1 phases. Ephedrine and anisodamine increased the
level of CD1 in SKBR3 cells. Furthermore, significant change in intracellular cAMP concentration was found in SKBR3 cells treated with ephedrine
and anisodamine. The phosphorylation of PKA substrate was not activated after 48 hours of treatment with ephedrine and anisodamine.
Conclusion: Ephedrine and anisodamine inhibit the proliferation of SKBR3 cells via a significantly change of intracellular cAMP concentration
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