50 research outputs found
R09. New Atractylon Derivatives Generated in Processed Rhizomes of Atractylodes macrocephala Koidz
No full textCorresponding author (NCNPR): Jianping Zhao, [email protected]://egrove.olemiss.edu/pharm_annual_posters/1008/thumbnail.jp
Attractor for a model of extensible beam with damping on time-dependent space
No full textIn this paper, we study the asymptotic behavior of the following extensible beam equations: \varepsilon(t) u_{tt}+\Delta^2 u-M\bigg(\int_\Omega |\nabla u|^2dx\bigg) \Delta u +\alpha u_t+\varphi (u)=f, \quad t> \tau, where is a decreasing function of time vanishing at infinity. After generalizing the abstract results on time dependent space, we establish an invariant time-dependent global attractor for the equation by proving the well-posedness (thereby, the existence of process), dissapativity and the compactness of the process. Our work supplements the theoretical results on time-dependent space and the results on the longtime behavior of the model
Reflectance difference spectroscopy microscope for circular defects on InN films
No full textReflectance difference spectroscopy microscope (mu-RDS) is presented to characterize microstructural defects on the surface of materials. We use this microscope to study the circular defects on InN films and obtain the real normal reflectivity image and reflectance difference (RD) image by averaging the results before and after a 90 degrees rotation of the sample. We analyze the experimental data along with other methods and formally ensure the reliability of this microscope. Comparing with the results of AFM, we prove that the reflectivity image of our mu-RDS can characterize the surface topography, size and location of the defects. We find the RD image generated by uniform height fluctuation is a standard four polar distribution in an established ideal circular defect model. However, a non-four polar distribution of RD image can be caused by the strain field as well as nonstandard height fluctuations, which is verified by simulation and Raman mapping technique. So the mu-RDS is an ideal tool for optical anisotropy distribution induced by small changes in the height and strain field around the defect boundary in plane. (C) 2016 Optical Society of America973 program [2012CB619306, 2012CB921304, 2013CB632805, 2015CB921503]; National Natural Science Foundation of China [61474114, 60990313, 61225019, 11574302]SCI(E)[email protected]
Global research hotspots and trends of iodinated contrast agents in medical imaging: a bibliometric and visualization analysis
No full textObjectiveThis study employs bibliometric methods to explore the global research dynamics of iodine contrast agents in medical imaging. Through the visualization of knowledge maps, it presents research progress and reveals the research directions, hotspots, trends, and frontiers in this field.MethodsUsing Web of Science Core Collection database, CiteSpace and VOSviewer were employed to conduct a visual analysis of the global application of iodine contrast agents in medical imaging over the past four decades. The analysis focused on annual publication volume, collaboration networks, citation characteristics, and keywords.ResultsA total of 3,775 studies on the application of iodine contrast agents in medical imaging were included. The earliest paper was published in 1977, with a slight increase in publications from 1991 to 2004, followed by a significant rise after 2005. The United States emerged as the leading country in publication volume. Harvard University was identified as a globally influential institution with 126 publications. Although a large author collaboration cluster and several smaller ones were formed, most collaborations between authors were relatively weak, with no high-density integrated academic network yet established. Pietsch Hubertus was the most prolific author, while Bae KT was the most highly co-cited author. The most highly cited journal was Radiology, with 2,384 citations. Co-occurrence analysis revealed that the top three keywords by frequency were “agent,” “CT,” and “image quality.” Keyword clustering analysis showed that the top three clusters were “gadolinium,” “gold nanoparticles,” and “image quality.” The timeline analysis indicated that clusters such as “gadolinium,” “gold nanoparticles,” “image quality,” and “material decomposition” exhibited strong temporal continuity, while the keyword with the highest burst value was “digital subtraction angiography” (19.38). Burst term trend analysis suggested that recent research has been focusing on areas like “deep learning,” “risk,” “radiation dosage,” and “iodine quantification.”ConclusionThis study is the first to systematically reveal the global trends, hotspots, frontiers, and development dynamics of iodine contrast agents in medical imaging through the use of CiteSpace and VOSviewer. It provides a novel perspective for understanding the role of iodine contrast agents in imaging and offers valuable insights for advancing global research in medical imaging
‐hydroxybenzonic acid from its isomer using Box–Behnken design–based statistical modeling
No full textImproving In Vitro Plant Regeneration from Leaf and Petiole Explants of `Marion' Blackberry
No full textEvaluation of Beef Marbling Grade Based on Advanced Watershed Algorithm and Neural Network
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Genome-Wide Identification and Evolutionary and Expression Analyses of the Cyclin B Gene Family in <i>Brassica napus</i>
No full textCyclin B (CYCB) is a regulatory subunit of cyclin-dependent kinase (CDK), the concentration of which fluctuates to regulate cell cycle progression. Extensive studies have been performed on cyclins in numerous species, yet the evolutionary relationships and biological functions of the CYCB family genes in Brassica napus remain unclear. In this study, we identified 299 CYCB genes in 11 B. napus accessions. Phylogenetic analysis suggests that CYCB genes could be divided into three subfamilies in angiosperms and that the CYCB3 subfamily members may be a newer group that evolved in eudicots. The expansion of BnaCYCB genes underwent segmental duplication and purifying selection in genomes, and a number of drought-responsive and light-responsive cis-elements were found in their promoter regions. Additionally, expression analysis revealed that BnaCYCBs were strongly expressed in the developing seed and silique pericarp, as confirmed by the obviously reduced seed size of the mutant cycb3;1 in Arabidopsis thaliana compared with Col-0. This study provides a comprehensive evolutionary analysis of CYCB genes as well as insight into the biological function of CYCB genes in B. napus
