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2. The Point Spread Function Reconstruction by Using Moffatlets - I

Author

Li, Baishun, Li, Guoliang, Cheng, Jun, Peterson, John, and Cui, Wei

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - Astrophysics of Galaxies
Abstract

The shear measurement is a crucial task in the current and the future weak lensing survey projects. And the reconstruction of the point spread function(PSF) is one of the essential steps. In this work, we present three different methods, including Gaussianlets, Moffatlets and EMPCA to quantify their efficiency on PSF reconstruction using four sets of simulated LSST star images. Gaussianlets and Moffatlets are two different sets of basis functions whose profiles are based on Gaussian and Moffat functions respectively. Expectation Maximization(EM) PCA is a statistical method performing iterative procedure to find principal components of an ensemble of star images. Our tests show that: 1) Moffatlets always perform better than Gaussianlets. 2) EMPCA is more compact and flexible, but the noise existing in the Principal Components (PCs) will contaminate the size and ellipticity of PSF while Moffatlets keeps them very well., Comment: 19 pages,17 figures,Accepted for publication in RAA

Published
2016
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23. Therapeutic effects of 3,3′-diindolylmethane on the alveolar bone in mice with experimentally induced periodontitis.

Author

Jiang, Qianzhou, Guan, Hongbing, He, Jinquan, Li, Baishun, and Pan, Jingjing

Subjects
DIINDOLYLMETHANE, BONE resorption, PERIODONTITIS, CYTOKINES, REVERSE transcriptase polymerase chain reaction, ANTI-inflammatory agents, THERAPEUTICS
Abstract

In this study, we investigated effects of 3,3′-diindolylmethane (DIM) on alveolar bone resorption in mice with experimentally induced periodontitis. Experimental periodontitis was induced by placing 5.0 silk sutures around the maxillary left second molar for 1 week. Fifty-three SPF, 6-8-week-old, female C57 mice were randomly divided into four groups: (1) healthy mice (control group), (2) mice with experimentally induced periodontitis (Ped group), (3) mice with periodontitis treated with corn oil (OIL-Ped group) and (4) mice with periodontitis treated with DIM dissolved in corn oil (DIM-Ped group). Infiltration of inflammatory cells in the gingival tissue was assessed via histomorphometrical analysis, inflammatory factors were detected by reverse transcription quantitative polymerase chain reaction (RT-qPCR) and changes in the alveolar bone were detected by micro-computed tomography (micro-CT) after treatment for 1 and 4 weeks. After 1 week of treatment, compared with the Ped and OIL-Ped groups, the DIM-Ped group showed decreased infiltration of inflammatory cells, preservation of connective tissue in the papilla and less interproximal and interradicular bone resorption. In the DIM-Ped group, the expression of IL-1β and RANKL decreased significantly (P < 0.05). After 4 weeks of treatment, periodontal inflammation level and alveolar bone absorption were similar among groups. However, in the DIM-Ped group, the expression of IL-1β, IL-6 and RANK significantly decreased (P < 0.05). As a whole, DIM treatment for 1 week can benefit alveolar bone recovery by inhibiting the inflammation of the periodontal tissue and expression of bone resorption-related cytokines. [ABSTRACT FROM AUTHOR]

Published
2018
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