Subjects: Biology >> Botany submitted time 2022-09-03 Cooperative journals: 《广西植物》
Abstract： Bei-dou-gen, the rhizome of Menispermum dauricum. from the Menispermaceae family, is an important Chinese medicinal material. In order to provide an effective reference for the study on the pharmacological substance basis and the rational utilization of medicinal plant resources, the methanol extract of the rhizome of M. dauricum was systematically isolated and purified using various chromatographic methods and the structures of isolated compounds were identified. And thre potential anti-inflammatory effect of obtained compounds from M. dauricum DC.was messured in vitro. In this study, the chemical constituents were separated via silica gel column chromatography, macroporous adsorption resin, and preparative HPLC and their structures were determined on the basis of MS, 1H NMR, 13C NMR, and other spectroscopic data analysis, as well as comparison with relevant literatures. Meanwhile, the anti-inflammatory activities of against NO and IL-6 production from LPS-stimulated RAW264.7 cells of the chemical components were evaluated in vitro. The results were as follows: (1) Fifteen compounds were isolated from the rhizome of Menispermum dauricum DC., and identified as p-hydroxybenzaldehyde (1), vanilic acid (2), syringaldehyde (3), 2-hydroxy-1-(4-hydroxy-3,5-dimethoxyphenyl)-1-propanone (4), methyl 4-hydroxyphenylacetate (5), 2-(4-hydroxyphenyl)-1-nitroethane (6), 4-hydroxyphenylacetonitrile (7), dibutyl phthalate (8), fragransin B2 (9), 7-hydroxy-3,6-dimethoxy-1,4-phenanthraquinone (10), palmitic acid (11), arachidic acid (12), β-sitosterol (13), β-stigmasterol (14), and daucosterol (15). Among them, compounds 4-7, 9, and 12 were isolated from Menispermaceae for the first time, while compounds 1, 3-11, and 14 were first reported from Menispermum genus. The above compounds were all non-alkaloids components, including phenols, lignans, phenoquiones, fatty acids, and sterols, which enlarged the types of compounds and enriched the phytochemical information of the rhizome of M. dauricum DC. (2) Anti-inflammatory assays in vitro showed that compound 12 could significantly inhibited releases of NO and IL-6 induced by LPS from RAW 264.7 cells at the concentrations of 25 and 50 μg·mL﹣1, indicating potential anti-inflammatory effect.
Subjects: Biology >> Biomedical Laboratory Science Subjects: Computer Science >> Computer Application Technology submitted time 2022-05-26
Abstract：
Up to now, image quality assessment does not involve color problem. The literature of image quality assessment mostly assesses the deterioration (degradation) of image quality (in the process of image processing such as compression and transmission). Planar image is a two-dimensional luminance distribution. Luminance is the core parameter of image visual quality. Without luminance, there will be no image, and it is impossible to discuss image quality. In this paper, three levels of image visual perception quality assessment (VPQA) are proposed, they are: single-and-single-parameter image quality assessment (SS-IQA), single-and-five-parameter fine image quality evaluation (SFF-IQA), and enhanced image quality assessment considering color fidelity (CF_IQA). Horizontally, it can be divided into three aspects: single image quality assessment, multiple image quality comparison and enhanced image quality assessment. Visual quality assessment of an image is an indispensable tool for intelligent optimization image enhancement.
Peer Review Status:
Awaiting Review
Subjects: Computer Science >> Computer Application Technology Subjects: Medicine, Pharmacy >> Other Disciplines of Medicine and Pharmacology Subjects: Engineering and technical science >> Optical Engineering submitted time 2021-05-24
Abstract： Human sense of stimulus quantity is divided into quantitative sense and qualitative sense. Whether it's Weber- Fechner's logarithm sensory law or Stevens's power function sensory law are both such a law that is about the quantitative relationship between sensory quantity and one-dimensional luminance stimulus. The image belongs to the stimulus with two-dimensional distribution characteristics of the luminance. It is studied in this paper that is the qualitative sense for two-dimensional luminance stimulus, that is, the sense of the good level or bad level of the quality of two-dimensional luminance stimulus are studied. Good level or bad level is a fuzzy psychological conception, so we need to use the method of fuzzy mathematics to quantify the good level or the bad level of the visual perception quality of an image, that is to establish a fuzzy membership function PQ to quantitatively represent the good level or the bad level of the visual quality of an image.
Peer Review Status:Awaiting Review
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