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"Peng, Peng"
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Precambrian mafic dyke swarms in the North China Craton and their geological implications
A map of major Precambrian mafic dyke swarms and related units in the North China Craton is compiled, and the features and geological implications of these swarms are demonstrated. The Archean dyke swarms are available to portray the early crustal growth and cratonization. The middle Paleoproterozoic （2200-1850 Ma） swarms and related magmatic series could constrain the tectonic evolution： They approve that the craton was amalgamated by two sub-cratons. The late Paleoproterozoic （1800-1600 Ma）, Mesoproterozoic （1400-1200 Ma） and Neoproterozoic （1000-800 Ma） series swarms are important in paleogeographic reconstruction： they indicate that North China might have connected with some of the North European and North American cratons during Proterozoic. Dyke swarms are not only geological timescales and tectonic markers but also evolution indicators of lithospheric mantle： they imply a rejuvenation of the sub-continental lithospheric mantle of North China at 1780-1730 Ma. These swarms occurred with several rifts, including the Hengling （2200-1970 Ma）, Xuwujia （1970-1880 Ma）, Xiong＇er （1800-1600 Ma）, Yan-Liao （1730-1200 Ma）, and Xu-Huai （1000-800 Ma）. Among them, the Xuwujia rift was possibly continental arc associated; whereas the others were intra-continental. In addition, the Xiong＇er and Xu-Huai rifts were possibly triple junctions along the present southern and southeastern margins of the Craton, respectively. Different tectonic set- tings of these rifts and dyke swarms would result in diversified series of ore deposits.
Journal Article
Extraction, Structure and Immunoregulatory Activity of Low Molecular Weight Polysaccharide from Dendrobium officinale
The ethanol precipitation method has been widely-used for Dendrobium officinale polysaccharides preparation. However, the alcohol-soluble fractions have always been ignored, which causes significant wastes of resources and energies. In this study, the extraction, physicochemical properties, and immune regulation activity of an edible D. officinale polysaccharide (DOPs) isolated from the supernatant after 75% ethanol precipitation were systematically investigated. The structural characteristics determination results showed that DOPs was mainly composed of glucose and mannose at a molar ratio of 1.00:5.78 with an average molecular weight of 4.56 × 103 Da, which was made up of α-(1,3)-Glcp as the main skeleton, and the α-(1,4)-Glcp and β-(1,4)-Manp as the branches. Subsequently, the cyclophosphamide (CTX)-induced immunosuppressive mice model was established, and the results demonstrated that DOPs could dose-dependently protect the immune organs against CTX damage, improve the immune cells activities, and promote the immune-related cytokines (IL-2, IFN-γ and TNF-α) secretions. Furthermore, DOPs treatment also effectively enhanced the antioxidant enzymes levels (SOD, GSH-Px) in sera and livers, therefore weakening the oxidative damage of CTX-treated mice. Considering these above data, DOPs presented great potential to be explored as a natural antioxidant and supplement for functional foods.
Journal Article
Fashion illustration : wedding dress inspiration
\"A wedding dress is the dream dress of every woman. This book invites Peng Jing (China Top 10 Fashion Designer) as the writer to introduce the working process of wedding dress, relationship between wedding dress design and illustrations, and how to paint wedding dress illustrations from the perspective of design and painting. It includes knowledge such as painting tools and materials, body structure, texture expression and detail expression, and detailed step-by-step tutorials of illustrations and a large amount of delicate illustration works, including wedding dresses, formal dresses, Chinese wedding dresses and accessories. Through this book, readers can master the basics of wedding dress illustration easily and paint excellent wedding dress illustrations.\"-- Publisher's description.
Book
Clinical Characteristics of Coronavirus Disease 2019 in China
In this study, researchers describe the clinical characteristics of coronavirus disease 2019 in a selected cohort of 1099 patients with laboratory-confirmed disease throughout mainland China during the first 2 months of the current outbreak.
Journal Article
Immunological and inflammatory profiles in mild and severe cases of COVID-19
COVID-19 is associated with 5.1% mortality. Although the virological, epidemiological, clinical, and management outcome features of COVID-19 patients have been defined rapidly, the inflammatory and immune profiles require definition as they influence pathogenesis and clinical expression of COVID-19. Here we show lymphopenia, selective loss of CD4+ T cells, CD8+ T cells and NK cells, excessive T-cell activation and high expression of T-cell inhibitory molecules are more prominent in severe cases than in those with mild disease. CD8+ T cells in patients with severe disease express high levels of cytotoxic molecules. Histochemical studies of lung tissue from one fatality show sub-anatomical distributions of SARS-CoV-2 RNA and massive infiltration of T cells and macrophages. Thus, aberrant activation and dysregulation of CD8+ T cells occur in patients with severe COVID-19 disease, an effect that might be for pathogenesis of SARS-CoV-2 infection and indicate that immune-based targets for therapeutic interventions constitute a promising treatment for severe COVID-19 patients.
Journal Article
Thermally activated delayed fluorescence (TADF) organic molecules for efficient X-ray scintillation and imaging
X-ray detection, which plays an important role in medical and industrial fields, usually relies on inorganic scintillators to convert X-rays to visible photons; although several high-quantum-yield fluorescent molecules have been tested as scintillators, they are generally less efficient. High-energy radiation can ionize molecules and create secondary electrons and ions. As a result, a high fraction of triplet states is generated, which act as scintillation loss channels. Here we found that X-ray-induced triplet excitons can be exploited for emission through very rapid, thermally activated up-conversion. We report scintillators based on three thermally activated delayed fluorescence molecules with different emission bands, which showed significantly higher efficiency than conventional anthracene-based scintillators. X-ray imaging with 16.6 line pairs mm
resolution was also demonstrated. These results highlight the importance of efficient and prompt harvesting of triplet excitons for efficient X-ray scintillation and radiation detection.
Journal Article