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Yingying Ye,Zeqin Fu,Yunfang Tian,Jiji Li,Baoying Guo,Zhenming Lv,Changwen Wu 한국유전학회 2018 Genes & Genomics Vol.40 No.11
Pelagic larval dispersal habits influence the population genetic structure of marine mollusk organisms via gene flow. The genetic information of the clam Gomphina aequilatera (short larval stage, 10 days) which is ecologically and economically important in the China coast is unknown. To determine the influence of planktonic larval duration on the genetic structure of G. aequilatera. Mitochondrial markers, cytochrome oxidase subunit i (COI) and 12S ribosomal RNA (12S rRNA), were used to investigate the population structure of wild G. aequilatera specimens from four China Sea coastal locations (Zhoushan, Nanji Island, Zhangpu and Beihai). Partial COI (685 bp) and 12S rRNA (350 bp) sequences were determined. High level and significant FST values were obtained among the different localities, based on either COI (FST = 0.100–0.444, P < 0.05) or 12S rRNA (FST = 0.193–0.742, P < 0.05), indicating a high degree of genetic differentiation among the populations. The pairwise Nm between Beihai and Zhoushan for COI was 0.626 and the other four pairwise Nm values were > 1, indicating extensive gene flow among them. The 12S rRNA showed the same pattern. AMOVA test results for COI and 12S rRNA indicated major genetic variation within the populations: 77.96% within and 22.04% among the populations for COI, 55.73% within and 44.27% among the populations for 12S rRNA. A median-joining network suggested obvious genetic differentiation between the Zhoushan and Beihai populations. This study revealed the extant population genetic structure of G. aequilatera and showed a strong population structure in a species with a short planktonic larval stage.
Guanqun Chao,Yingying Wang,Fangxu Ye,Shuo Zhang 연세대학교의과대학 2018 Yonsei medical journal Vol.59 No.8
Purpose: This study aimed to screen for differentially expressed microRNAs (miRNAs) in the colons of rats with visceral hypersensitivityto build the expression profiles of miRNAs therein and to determine the mechanism of Tongxieyaofang use in thetreatment of irritable bowel syndrome (IBS). Materials and Methods: Forty Sprague-Dawley rats were divided randomly into four groups: control group, model control group(induced by rectum stimulus and evaluated by abdominal withdraw reaction), treatment control group (normal saline), andTongxieyaofang group (treated with Tongxieyaofang). We screened for differential expression of colonic mucosal miRNAs usingliquid chip technology and verified the expression thereof using reverse transcription-PCR. Results: The visceral hypersensitivity rat model was successfully established. We found the expression of let-7f, let-7i, miR-130b,miR-29a, miR-132, miR-21, and miR-375 to be up-regulated (p<0.05), while the expression of miR-24, miR-31a, miR-192, miR-221,and miR-223 was down-regulated (p<0.05) in the visceral hypersensitivity rats. After treatment with Tongxieyaofang, the expressionof let-7f, let-7i, miR-130b, miR-29a, miR-132, miR-21, and miR-375 was reduced (p<0.05), whereas the expression of miR-24,miR-31a, miR-192, miR-221, miR-223 was increased, compared to the treatment control group (p<0.05). Conclusion: MiRNAs play a pivotal role in visceral hypersensitivity and might be targets in the treatment of IBS by Tongxieyaofang.
Analysis of the Strength of Different Minerals-Modified MPC Based on Mathematical Models
Qi Kang,Jingxin Bao,Ran Li,Yingying Zuo,Yanxia Ye,Hua Huang 한국콘크리트학회 2024 International Journal of Concrete Structures and M Vol.18 No.3
The study discussed the effects of different mineral incorporations and the curing time on the strength of modified magnesium phosphate cement (MPC) mortars through mechanical tests, mathematical model analysis and microstructure characterization. Fly ash (FA), silica fume (SF), and metakaolin (MK), which exhibit excellent durability and bonding properties, were used to modify the MPC. A quantitative relationship was established between the strength of modified MPC mortars and the mineral incorporation and curing time. First, the strength of each mineral-modified MPC mortar cured in air with different mineral incorporations and curing durations was evaluated. The strengths of MPC mortars containing 10% fly ash, 15% silica fume, and 10% metakaolin—which perform best in their incorporations—were compared to analyze the function of the three minerals. To establish the relationship between strength and mineral incorporation and curing time, three mathematical models, linear model, general nonlinear model, and data distribution shape nonlinear model (DDSNM), are commonly used for material property analysis based on statistics. DDSNM best describes the trend of strength change among the three models and the error is small for three minerals. Based on DDSNM, the influence of various minerals on the strength of MPC mortar was quantitatively evaluated by calculating the variable partial derivatives, and verified by scanning electron microscopy and X-ray diffraction. MK performs the best in improving the flexural strength performance of MPC, while SF performs the best in the compressive strength. FA-MPC has low sensitivity to dosage fluctuations and is easy to prepare.