85 results on '"Meng, Ping"'
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2. Ultrafast Visual Detection of a Trace Amount of Water by Highly Efficient Hybrid Manganese Halides.
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Zhang, Jie, Ren, Meng-Ping, Xu, Man, Zhang, Zhonghui, An, Mingxue, Lu, Yang, Lei, Xiao-Wu, Gong, Zhongliang, and Yue, Cheng-Yang
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- 2024
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3. The CXCR4-AT1 axis plays a vital role in glomerular injury via mediating the crosstalk between podocyte and mesangial cell.
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Wu, Qinyu, Zhou, Shan, Xu, Dan, Meng, Ping, Chen, Qiurong, Wang, Xiaoxu, Li, Xiaolong, Chen, Shuangqin, Ye, Huiyun, Ye, Wenting, Xiong, Yabing, Li, Jiemei, Miao, Jinhua, Shen, Weiwei, Lin, Xu, Hou, Fan Fan, Liu, Youhua, Zhang, Yunfang, and Zhou, Lili
- Abstract
Glomeruli stand at the center of nephrons to accomplish filtration and albumin interception. Podocytes and mesangial cells are the major constituents in the glomeruli. However, their interdependency in glomerular injury has rarely been reported. Herein, we investigated the role of C-X-C chemokine receptor type 4 (CXCR4) in mediating the crosstalk between podocytes and mesangial cells. We found CXCR4 and angiotensin II (AngII) increased primarily in injured podocytes. However, type-1 receptor of angiotensin II (AT1) and stromal cell-derived factor 1α (SDF-1α), a ligand of CXCR4, were evidently upregulated in mesangial cells following the progression of podocyte injury. Ectopic expression of CXCR4 in 5/6 nephrectomy mice increased the decline of renal function and glomerular injury, accelerated podocyte injury and mesangial cell activation, and initiated CXCR4-AT1 axis signals. Additionally, treatment with losartan, an AT1 blocker, interrupted the cycle of podocyte injury and mesangial matrix deposition triggered by CXCR4. Podocyte-specific ablation of CXCR4 gene blocked podocyte injury and mesangial cell activation. In vitro, CXCR4 overexpression induced oxidative stress and renin angiotensin system (RAS) activation in podocytes, and triggered the communication between podocytes and mesangial cells. In cultured mesangial cells, AngII treatment induced the expression of SDF-1α, which was secreted into the supernatant to further promote oxidative stress and cell injury in podocytes. Collectively, these results demonstrate that the CXCR4-AT1 axis plays a vital role in glomerular injury via mediating pathologic crosstalk between podocytes and mesangial cells. Our findings uncover a novel pathogenic mechanism by which the CXCR4-AT1 axis promotes glomerular injury. [ABSTRACT FROM AUTHOR]
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- 2024
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4. Relationship between negative air ion and PM2.5 in Quercus variabilis under natural conditions.
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CAI Lulu, SUN Shoujia, SHI Guangyao, DU Lingtong, NI Xilu, ZHANG Jinsong, and MENG Ping
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In recent years, PM
2.5 pollution has become a most important source of air pollution. Prolonged exposure to high PM25 concentrations can give rise to severe health issues. Negative air ion (NAI) is an important indicator for measuring air quality, which is collectively known as the 'air vitamin'. However, the intricate and fluctuating meteorological conditions and vegetation types result in numerous uncertainties in the correlation between PM2.5 through positioning observation during the period of June to September in 2019 and 2020 under the condition of relatively constant leaf area in Quercus variabilis forest, a typical forest in warm temperate zones. We investigated the spatiotemporal variation of PM2.5 and NAI under consistent meteorological conditions, established the correlation between PM2.5 and NAI, and explicated the impact mechanism of PM2.5 on NAI in natural conditions. The results showed that NAI decreased exponentially with the increases in natural PM2.5 , with a significant negative correlation (y = 1148.79 x-0.123 ). The decrease rates of NAI in PM2.5 20-40, 40-80, 80-100 and 100-120 µg • m-3 were 40 .1%, 36.2%, 9.4%, 2 .4%, 5.1% and 6.8%, respectively. Results of the sensitivity analysis showed that the PM2.5 concentration range of 0-40 µg • m-3 was the sensitive range that affected NAI. Our findings could provide a scientific basis for better understanding the response mechanisms of NAI to environmental factors. [ABSTRACT FROM AUTHOR]- Published
- 2024
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5. Responses of tree growth and intrinsic water-use efficiency of Robinia pseudoacacia to climate factors.
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HU Xiaochuang, GAO Wanting, SUN Shoujia, ZHANG Jinsong, MENG Ping, and CAI Jinfeng
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We investigated tree growth in Robinia pseudoacacia plantations at Ansai in Shaanxi Province and at Ji-xian in Shanxi Province by comparing the tree-ring width, basal area increase (BAI), δ
13 C value, intrinsic water-use efficiency (iWUE), and stomatal regulation. We quantified the responses of tree growth and iWUE to climatic factors at each site. The tree-ring width at Ansai and Jixian decreased with stand age, whereas the BAI at Ansai increased, and that at Jixian decreased after the BAI peaked. The δ13 C value and iWUE of trees at Jixian were higher than those at Ansai. The iWUE of trees at both sites was similar to the constant intercellular CO2 concentration/atmospheric CO2 concentration (Ci /Ca ) scenario, indicating that the C; of trees was elevated with increasing Ca, while the stomata remained open. The BAI at Ansai was significantly positively correlated with highest temperature in May, relative humidity in June, precipitation in August, relative humidity in September, and standardized precipitation evapotranspiration index (SPEI) in September and October of current year, but negatively correlated with temperature in June. The BAI at Jixian was significantly positively correlated with SPEI in June and July, and lowest temperature in October of current year. The iWUE of trees at Ansai was significantly positively correlated with relative humidity and precipitation in June of the current year, but negatively correlated with minimum temperature in May, relative humidity in June, and temperature and maximum temperature in July of current year. A significant positive correlation between iWUE of trees at Jixian and lowest temperature in June of current year was detected. At the annual scale, the BAI of trees at Ansai was positively correlated with precipitation and SPEI, but no significant relationship was observed for trees at Jixian. However, the iWUE of trees at both sites was significantly affected by precipitation. Path analysis showed that SPEI and minimum temperature had a direct effect on BAI and iWUE of trees at Ansai, whereas precipitation and average temperature indirectly affected BAI and iWUE through SPEI. The highest temperature had a direct effect on tree growth at Jixian, whereas precipitation, minimum temperature, and average temperature had direct effects on iWUE. These results suggested that SPEI was the main climatic factor that affected the growth of R. pseudoacacia, while C; was an important physiological factor. Our results could provide reference for the protection and management of R. pseudoacacia plantations under climate change. [ABSTRACT FROM AUTHOR]- Published
- 2023
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6. Detection of two markers for pancreatic cancer (CEA, CA199) based on a nano-silicon sphere-cyclodextrin recognition platform.
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Wang, Xiaohui, Meng, Ping, Li, Shuhong, Tan, Jinhua, Su, Bude, Cheng, Qi, and Yang, Xiaoling
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PANCREATIC cancer ,TUMOR markers ,TUMOR antigens ,CARCINOEMBRYONIC antigen ,TUMOR treatment - Abstract
The detection of tumor markers has significant importance in the early diagnosis of cancer. It is an important indicator for evaluating the extent of the disease and monitoring the efficacy of tumor treatment. Therefore, it is meaningful to find a convenient, fast, and sensitive method to detect tumor markers. Carbohydrate antigen 19–9 (CA19-9) is the first discovered carbohydrate antigen tumor marker with the highest sensitivity and specificity for pancreatic cancer. Carcinoembryonic antigen (CEA), as the most widely spectrum carbohydrate antigen tumor marker, can show an upward trend in many tumors. In this work, an electrochemical immunosensing platform was proposed for the detection of CEA and CA199. Nano-silicon sphere-cyclodextrin was synthesized for antibody capture. Graphene and gold nanoparticles were used to modify the electrode, improving the electronic conductivity of the electrode. The synthesized sensor can be used for highly sensitive detection of two tumor markers. This method also provides a new platform for clinical immune analysis of other biomolecules. [ABSTRACT FROM AUTHOR]
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- 2023
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7. Scalable microshutter focal plane masks for UV, visible, and infrared spectroscopy
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Siegmund, Oswald H., Hoadley, Keri, Kutyrev, Alexander, Greenhouse, Matthew, Chang, Meng-Ping, Scowen, Paul, Brekosky, Regis, Kim, Kyowon, Costen, Nicholas, Kotecki, Carl, Ke, Ming, Hu, Gang, Wang, Frederick, Paquette, Beth, Ray, Knute, Fettig, Rainer, and McCandliss, Stephan
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- 2023
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8. An enhanced contrast evaluation testbed for next-generation microshutter arrays
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Siegmund, Oswald H., Hoadley, Keri, Mitchell, Owen H., McCandliss, Stephan R., Pelton, Russell, Kutyrev, Alexander S., Greenhouse, Matthew, Chang, Meng-Ping, Kim, Kyowon, Kotecki, Carl A., and Scowen, Paul
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- 2023
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9. Impurity distribution in preparation of high-purity aluminum by vacuum zone melting
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DUAN, Meng-ping, ZHAO, Jin-yang, XU, Bao-qiang, KONG, Ling-xin, YANG, Bin, WAN, He-li, and FU, Cheng-cheng
- Abstract
A novel vacuum zone melting process for preparing high-purity Al was proposed. The axial segregation of impurities was investigated by determining the equilibrium distribution coefficient. Theoretical and experimental results showed that impurities (Cu, Si, and Fe) with an equilibrium distribution coefficient k0<1 accumulated in the tail of the Al ingot, while Ti (k0>1) accumulated at the head end of the ingot. When the molten area moving at 1.5 mm/min and zone melting was performed 15 times, the removal rate of the impurities and the purity of Al were the highest. In the middle of the Al ingot, i.e. 140 mm away from the head end of the sample, the removal rates of Cu, Fe, and Si were higher than 90%, that of Ti was higher than 75%, and the Al content was higher than 99.999%. The purity of the Al samples met the requirements of the commercial 99.999% (5N) high-purity Al standard.
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- 2023
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10. Zero-Dimensional Hybrid Cuprous Halide of [BAPMA]Cu2Br5 as a Highly Efficient Light Emitter and an X‑Ray Scintillator.
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Liu, Yu-Hang, Wang, Nan-Nan, Ren, Meng-Ping, Yan, Xue, Wu, Yi-Fan, Yue, Cheng-Yang, and Lei, Xiao-Wu
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- 2023
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11. Photovoltaic defect detection method for marine pasture based on deep learning
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Kong, Xiangjie, Guo, Dan, Qiao, Xueming, Xu, Ming, Meng, Ping, Yong, Qun, Li, Yuwen, and Li, Shuangchao
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- 2023
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12. MULTIMODAL IMAGING OF ACUTE MULTIFOCAL HEMORRHAGIC RETINAL VASCULITIS: A CASE REPORT.
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Meng, Ping-Ping, Lin, Chun-Ju, Hsia, Ning-Yi, Lai, Chun-Ting, Bair, Henry, Lin, Jane-Ming, and Tsai, Yi-Yu
- Abstract
Multimodal imaging used in the evaluation of severity of acute multifocal hemorrhagic retinal vasculitis and follow up for treatment response. Timely aggressive immunosuppressive therapy is beneficial for treating acute multifocal hemorrhagic retinal vasculitis. Purpose: To report a case of acute multifocal hemorrhagic retinal vasculitis and demonstrate the multimodal imaging. Methods: Interventional case report. Results: A 54-year-old woman without significant past medical history complained of redness and blurred vision in both eyes. Her visual acuity was counting fingers and 20/60. Mild conjunctival injection, anterior chamber cells, and vitreous haze were noted. Fundus showed multifocal intraretinal hemorrhages. Fluorescein angiography revealed vasculitic process with intraretinal hemorrhage blocking defects and retinal ischemic changes in both eyes. Anterior chamber tap fluid polymerase chain reaction for varicella zoster virus, herpes simplex virus I/II, cytomegalovirus, and Epstein-Barr virus was unremarkable. Rheumatology was consulted and systemic vasculitis was ruled out. Her vision improved to 20/50 and 20/20 after pulse methylprednisolone therapy, oral methotrexate, and prednisolone treatment. Conclusion: Acute multifocal hemorrhagic retinal vasculitis can occur in an immunocompetent patient. Multimodal Imaging is useful in the diagnosis and follow-up. Patients could benefit from early and aggressive immunosuppressive therapy. [ABSTRACT FROM AUTHOR]
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- 2023
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13. Zero-Dimensional Hybrid Cuprous Halide of [BAPMA]Cu2Br5as a Highly Efficient Light Emitter and an X-Ray Scintillator
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Liu, Yu-Hang, Wang, Nan-Nan, Ren, Meng-Ping, Yan, Xue, Wu, Yi-Fan, Yue, Cheng-Yang, and Lei, Xiao-Wu
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Lead halide perovskites have been explored as a new kind of promising X-ray with wide applications in radiation-associated fields, but low light yield and serious toxicity extremely restrict further applications. To address these issues, we herein demonstrated one new zero-dimensional (0D) organic–inorganic hybrid cuprous halide of [BAPMA]Cu2Br5(BAPMA = N,N-Bis(3-aminopropyl) methylamine) containing discrete [Cu4Br10]6–tetramers as excellent lead-free scintillators. Upon UV light excitation, [BAPMA]Cu2Br5displays highly efficient broadband yellowish-green light emission with one dominant peak at 526 nm, a large Stokes shift of 244 nm, and a high photoluminescent quantum yield of 53.40%. Significantly, this broadband light emission can also be excited by higher-energy X-ray as radioluminescence with a high scintillation light yield of 43,744 photons/MeV. The detection limit of 0.074 μGyair/s is also far less than the required value for regular medical diagnostics of 5.5 μGyair/s. The solution-assembled hybrid structure facilely enables the [BAPMA]Cu2Br5-based scintillation screen to display high-performance X-ray imaging with a spatial resolution of 15.79 lp/mm showcasing potential application in X-ray radiography. In brief, combined merits of low toxicity and cost, negligible self-absorption, a low detection limit, considerable light yield, and spatial resolution highlight the excellent scintillation performance of 0D hybrid cuprous halide.
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- 2023
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14. Near-unity broadband luminescent cuprous halide nanoclusters as highly efficient X-ray scintillators
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Li, Dong-Yang, Tan, Qingwen, Ren, Meng-Ping, Wang, Wen-Qi, Zhang, Bing-Lin, Niu, Guangda, Gong, Zhongliang, and Lei, Xiao-Wu
- Abstract
X-ray scintillators as functional energy materials possess the powerful ability to convert high-energy radiation into visible light with wide applications in various nuclear radiation fields. In this regard, three-dimensional (3D) lead perovskite nanocrystal-based X-ray scintillators have attracted extensive attention, but their low light yield and serious toxicity extremely restrict their further applications. To address these issues, a family of 0D hybrid cuprous halides of A2Cu4X6(A = PTPP, TPA; X = Br, I) based on discrete [Cu4X6]2−nanoclusters were demonstrated as highly desirable lead-free scintillators. Upon excitation of both ultraviolet and blue light, these halide nanoclusters displayed that self-trapped excitons induced broadband light emissions from green to red with near-unity photoluminescent quantum yield (PLQY, 93.1%) andlarge Stokes shifts (>1.3 eV). Significantly, the high PLQY, negligible self-absorption, and strong X-ray attenuation from [Cu4X6]2−nanoclusters endowed them with extraordinary radioluminescence properties. The linear radioluminescence intensity response to a wide range of X-ray dose rates gave an acceptable detection limit of 0.7563 µGyairs−1, which was lower than the required value for regular medical diagnostics (5.5 µGyairs−1). X-ray imaging demonstrated an ultrahigh spatial resolution of 14.83 lp mm−1and negligible afterglow (1.3 ms), showcasing potential applications in X-ray radiography. Overall, the combined superiorities of nontoxicity, high light yield, excellent stability, and good radiation hardness make cuprous halide nanoclusters excellent scintillators.
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- 2023
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15. MULTIMODAL IMAGING OF ACUTE MULTIFOCAL HEMORRHAGIC RETINAL VASCULITIS: A CASE REPORT
- Author
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Meng, Ping-Ping, Lin, Chun-Ju, Hsia, Ning-Yi, Lai, Chun-Ting, Bair, Henry, Lin, Jane-Ming, and Tsai, Yi-Yu
- Abstract
Multimodal imaging used in the evaluation of severity of acute multifocal hemorrhagic retinal vasculitis and follow up for treatment response. Timely aggressive immunosuppressive therapy is beneficial for treating acute multifocal hemorrhagic retinal vasculitis.
- Published
- 2023
- Full Text
- View/download PDF
16. KYA1797K, a Novel Small Molecule Destabilizing β-Catenin, Is Superior to ICG-001 in Protecting against Kidney Aging
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Zhu, Mingsheng, Ling, Xian, Zhou, Shan, Meng, Ping, Chen, Qiyan, Chen, Shuangqin, Shen, Kunyu, Xie, Chao, Kong, Yaozhong, Wang, Maosheng, and Zhou, Lili
- Abstract
Introduction:Aged kidney is characterized by mitochondrial dysfunction, cellular senescence, and fibrogenesis. The activation of Wnt/β-catenin signaling plays an important role in the initiation of kidney aging. However, the inhibiting strategies have not been discovered in detail. Here, we compared the therapeutic effects of two β-catenin inhibitors, KYA1797K and ICG-001, to assess their superiority. Methods:Two-month-old male C57BL/6 mice which had undergone unilateral nephrectomy and received D-galactose (D-gal) injection were co-treated with KYA1797K or ICG-001 at 10 mg/kg/day for 4 weeks. Human proximal renal tubular cells were treated with D-gal and KYA1797K/ICG-001 to compare their effects. Results:Compared with ICG-001, which inhibits β-catenin pathway through blocking the binding of β-catenin and cAMP response element-binding protein (CREB)-binding protein (CBP), KYA1797K, a novel small molecule destabilizing β-catenin through activating Axin-GSK3β complex, possesses the superior effects on protecting against kidney aging. In D-gal-treated accelerated aging mice, KYA1797K could greatly inhibit β-catenin pathway, preserve mitochondrial homeostasis, repress cellular senescence, and retard age-related kidney fibrosis. In cultured proximal tubular cells, KYA1797K shows a better effect on inhibiting cellular senescence and could better suppress mitochondrial dysfunction and ameliorate the fibrotic changes, at the same dose as that in ICG-001. Conclusion:These results show that effectively eliminating β-catenin is a necessity to target against age-related kidney injury, suggesting the multiple transcriptional regulation of β-catenin in kidney aging besides T-cell factor/lymphoid enhancer-binding factor family of transcription factors (TCF/LEF-1).
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- 2022
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17. Anticarin-β shows a promising anti-osteosarcoma effect by specifically inhibiting CCT4 to impair proteostasis.
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Wang, Gan, Zhang, Min, Meng, Ping, Long, Chengbo, Luo, Xiaodong, Yang, Xingwei, Wang, Yunfei, Zhang, Zhiye, Mwangi, James, Kamau, Peter Muiruri, Dai, Zhi, Ke, Zunfu, Zhang, Yi, Chen, Wenlin, Zhao, Xudong, Ge, Fei, Lv, Qiumin, Rong, Mingqiang, Li, Dongsheng, and Jin, Yang
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MOLECULAR chaperones ,SYNTAXINS ,TUMOR proteins ,CANCER cells ,OSTEOSARCOMA - Abstract
Unlike healthy, non-transformed cells, the proteostasis network of cancer cells is taxed to produce proteins involved in tumor development. Cancer cells have a higher dependency on molecular chaperones to maintain proteostasis. The chaperonin T-complex protein ring complex (TRiC) contains eight paralogous subunits (CCT1-8), and assists the folding of as many as 10% of cytosolic proteome. TRiC is essential for the progression of some cancers, but the roles of TRiC subunits in osteosarcoma remain to be explored. Here, we show that CCT4/TRiC is significantly correlated in human osteosarcoma, and plays a critical role in osteosarcoma cell survival. We identify a compound anticarin- β that can specifically bind to and inhibit CCT4. Anticarin- β shows higher selectivity in cancer cells than in normal cells. Mechanistically, anticarin- β potently impedes CCT4-mediated STAT3 maturation. Anticarin- β displays remarkable antitumor efficacy in orthotopic and patient-derived xenograft models of osteosarcoma. Collectively, our data uncover a key role of CCT4 in osteosarcoma, and propose a promising treatment strategy for osteosarcoma by disrupting CCT4 and proteostasis. TRiC plays a pivotal role in maintaining proteostasis that is essential to cancer cells. Anticarin- β as CCT4/TRiC inhibitor impedes TRiC-mediated STAT3 maturation on osteosarcoma cells to inducing proteotoxicity and apoptosis. [Display omitted] [ABSTRACT FROM AUTHOR]
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- 2022
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18. 5-HT7receptor-dependent intestinal neurite outgrowth contributes to visceral hypersensitivity in irritable bowel syndrome
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Chang, Wen-Ying, Yang, Yi-Ting, She, Meng-Ping, Tu, Chia-Hung, Lee, Tsung-Chun, Wu, Ming-Shiang, Sun, Chin-Hung, Hsin, Ling-Wei, and Yu, Linda Chia-Hui
- Abstract
Irritable bowel syndrome (IBS) is characterized by visceral hypersensitivity (VH) associated with abnormal serotonin/5-hydroxytryptamine (5-HT) metabolism and neurotrophin-dependent mucosal neurite outgrowth. The underlying mechanisms of VH remain poorly understood. We investigated the role of 5-HT7receptor in mucosal innervation and intestinal hyperalgesia. A high density of mucosal nerve fibres stained for 5-HT7was observed in colonoscopic biopsy specimens from IBS patients compared with those from healthy controls. Staining of 5-HT3and 5-HT4receptors was observed mainly in colonic epithelia with comparable levels between IBS and controls. Visceromotor responses to colorectal distension were evaluated in two mouse models, one postinfectious with Giardiaand subjected to water avoidance stress (GW) and the other postinflammatory with trinitrobenzene sulfonic acid-induced colitis (PT). Increased VH was associated with higher mucosal density of 5-HT7-expressing nerve fibres and elevated neurotrophin and neurotrophin receptor levels in the GW and PT mice. The increased VH was inhibited by intraperitoneal injection of SB-269970 (a selective 5-HT7antagonist). Peroral multiple doses of CYY1005 (a novel 5-HT7ligand) decreased VH and reduced mucosal density of 5-HT7-expressing nerve fibres in mouse colon. Human neuroblastoma SH-SY5Y cells incubated with bacteria-free mouse colonic supernatant, 5-HT, nerve growth factor, or brain-derived neurotrophic factor exhibited nerve fibre elongation, which was inhibited by 5-HT7antagonists. Gene silencing of HTR7also reduced the nerve fibre length. Activation of 5-HT7upregulated NGFand BDNFgene expression, while stimulation with neurotrophins increased the levels of tryptophan hydroxylase 2 and 5-HT7in neurons. A positive-feedback loop was observed between serotonin and neurotrophin pathways via 5-HT7activation to aggravate fibre elongation, whereby 5-HT3and 5-HT4had no roles. In conclusion, 5-HT7-dependent mucosal neurite outgrowth contributed to VH. A novel 5-HT7antagonist could be used as peroral analgesics for IBS-related pain.
- Published
- 2022
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19. 5-HT7receptor-dependent intestinal neurite outgrowth contributes to visceral hypersensitivity in irritable bowel syndrome
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Chang, Wen-Ying, Yang, Yi-Ting, She, Meng-Ping, Tu, Chia-Hung, Lee, Tsung-Chun, Wu, Ming-Shiang, Sun, Chin-Hung, Hsin, Ling-Wei, and Yu, Linda Chia-Hui
- Abstract
Irritable bowel syndrome (IBS) is characterized by visceral hypersensitivity (VH) associated with abnormal serotonin/5-hydroxytryptamine (5-HT) metabolism and neurotrophin-dependent mucosal neurite outgrowth. The underlying mechanisms of VH remain poorly understood. We investigated the role of 5-HT7receptor in mucosal innervation and intestinal hyperalgesia. A high density of mucosal nerve fibres stained for 5-HT7was observed in colonoscopic biopsy specimens from IBS patients compared with those from healthy controls. Staining of 5-HT3and 5-HT4receptors was observed mainly in colonic epithelia with comparable levels between IBS and controls. Visceromotor responses to colorectal distension were evaluated in two mouse models, one postinfectious with Giardiaand subjected to water avoidance stress (GW) and the other postinflammatory with trinitrobenzene sulfonic acid-induced colitis (PT). Increased VH was associated with higher mucosal density of 5-HT7-expressing nerve fibres and elevated neurotrophin and neurotrophin receptor levels in the GW and PT mice. The increased VH was inhibited by intraperitoneal injection of SB-269970 (a selective 5-HT7antagonist). Peroral multiple doses of CYY1005 (a novel 5-HT7ligand) decreased VH and reduced mucosal density of 5-HT7-expressing nerve fibres in mouse colon. Human neuroblastoma SH-SY5Y cells incubated with bacteria-free mouse colonic supernatant, 5-HT, nerve growth factor, or brain-derived neurotrophic factor exhibited nerve fibre elongation, which was inhibited by 5-HT7antagonists. Gene silencing of HTR7also reduced the nerve fibre length. Activation of 5-HT7upregulated NGFand BDNFgene expression, while stimulation with neurotrophins increased the levels of tryptophan hydroxylase 2 and 5-HT7in neurons. A positive-feedback loop was observed between serotonin and neurotrophin pathways via 5-HT7activation to aggravate fibre elongation, whereby 5-HT3and 5-HT4had no roles. In conclusion, 5-HT7-dependent mucosal neurite outgrowth contributed to VH. A novel 5-HT7antagonist could be used as peroral analgesics for IBS-related pain.
- Published
- 2022
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20. Liver Fibrosis Staging with Gadolinium Ethoxybenzyl Diethylenetriamine Penta-Acetic Acid-enhanced: A Systematic Review and Meta-analysis
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Lai, Lu-Yao, Huang, Meng-Ping, Su, Song, and Shu, Jian
- Abstract
Objective: While liver biopsy is the golden standard for liver-fibrosis diagnosis, it is also invasive and has many limitations. Non-invasive techniques such as Magnetic Resonance Imaging (MRI) need to be further developed for liver fibrosis staging. This study aimed to evaluate the diagnostic accuracy of Gadolinium Ethoxybenzyl Diethylenetriamine Penta-acetic Acid (Gd-EOBDTPA)- enhanced MRI for liver fibrosis through systematic review and meta-analysis. Methods: This study comprehensively searched relevant article in PubMed, Embase, and the Cochrane Library published from 2004 to 2018 to find studies analyzing the diagnostic accuracy of Gd-EOB-DTPA-enhanced MRI for liver fibrosis. Two reviewers independently screened the retrieved articles, extracted the required data from the included studies, and evaluated the methodological quality of the studies. The pooled sensitivity, specificity, positive likelihood ratio, negative likelihood ratio, diagnostic odds ratio, and Summary Receiver Operating Characteristics (SROC) curve were assessed. Results: This study finally included 16 studies (n = 1,599) and selected a random-effects model based on the results of the I
2 statistic to combine them. The areas under the SROC curve for the detection of F1 or greater, F2 or greater, F3 or greater, or F4 liver fibrosis were 0.8669, 0.8399, 0.8481, and 0.8858, respectively. Conclusion: Gd-EOB-DTPA-enhanced MRI showed a good diagnostic performance for staging liver fibrosis, especially for F4 liver fibrosis.- Published
- 2021
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21. Reference Values of Carotid Ultrafast Pulse-Wave Velocity: A Prospective, Multicenter, Population-Based Study
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Yin, Li-Xue, Ma, Chun-Yan, Wang, Shan, Wang, Yong-Huai, Meng, Ping-Ping, Pan, Xiao-Fang, Yang, Jun, Zhang, Yu-Hua, Liu, Ming-Hui, Li, Ming-Xing, Gao, Jie, Wu, Qiang, Feng, Ning-Na, Wu, Yi-Yun, Zhang, Jian-Xing, Xue, Li, Chang, Feng-Ling, Chen, Li, Sun, Yi-Xue, Yuan, Jian-Jun, Yang, Shun-Shi, Xue, Hong-Yuan, Ma, Ling-Zhi, Jiang, Xue-Zhong, Li, Jing, Zheng, Li-Qiang, Ren, Wei-Dong, Qiu, Jian-Min, Zeng, Hong-yan, Deng, You-Bin, Tu, Mei-Lin, Wang, Wen, Zhang, Sheng-min, Xiang, Ming-Hui, Zhang, Rui-Fang, Che, Ying, and Li, Yu-Hong
- Abstract
Ultrafast ultrasound imaging has been demonstrated to be an effective method to evaluate carotid stiffness through carotid pulse-wave velocity (PWV) with high reproducibility, but a lack of reference values has precluded its widespread use in clinical practice. The aims of this study were to establish reference values of PWV for ultrafast ultrasound imaging in a prospective, multicenter, population-based cohort study and to investigate the main determinants of carotid PWV.
- Published
- 2021
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22. Penicilliumin B Protects against Cisplatin-Induced Renal Tubular Cell Apoptosis through Activation of AMPK-Induced Autophagy and Mitochondrial Biogenesis
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Shen, Weiwei, Jia, Nan, Miao, Jinhua, Chen, Shuangqin, Zhou, Shan, Meng, Ping, Zhou, Xuefeng, Tang, Lan, and Zhou, Lili
- Abstract
Introduction:Acute kidney injury (AKI) is at a high prevalence in hospitalized patients, especially in those receiving chemotherapy. Cisplatin is the most widely used chemotherapy drug; however, with its side effects that include nephrotoxicity, it also exhibits a risk of inducing AKI. Importantly, recent studies have shown that autophagy plays a protective role in cisplatin-induced AKI. However, therapeutic strategies and candidate drugs for inducing activation of autophagy remain limited. Methods:In the present study, we adopted a novel candidate drug from a deep sea-derived Penicilliumstrain, penicilliumin B, to testify its protective role in cisplatin-induced renal tubular cell injury. Results:Penicilliumin B exhibited protection against cisplatin-induced apoptosis in cultured renal tubular epithelial cells and in cisplatin-treated mice. Moreover, penicilliumin B maintained normal mitochondrial morphology and inhibited the production of mitochondrial reactive oxygen species. Further studies demonstrated that penicilliumin B enhanced autophagic flux, promoted the activation of multiple autophagy-related proteins, such as mTOR, Beclin-1, ATG5, PINK1, and LC3B, and induced the degradation of p62. Interestingly, we also found penicilliumin B triggered phosphorylation of adenosine 5‘-monophosphate-activated protein kinase (AMPK), which is an upstream inducer of nearly all autophagy pathways and also an activator of mitochondrial biogenesis. These results suggest that AMPK may represent an activated site of penicilliumin B. Consistently, compound C, an AMPK inhibitor, significantly blocked the protective effects of penicilliumin B on mitochondria and apoptotic inhibition. Conclusion:Taken together, our findings indicate that penicilliumin B represents a novel AMPK activator that may provide protection against renal tubular cell apoptosis through activation of AMPK-induced autophagy and mitochondrial biogenesis.
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- 2021
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23. Layered double hydroxide modified polyamide reverse osmosis membrane for improved permeability
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Liu, Wei-Liang, Gao, Jia-Ming, Huang, Zhi-Hao, Zhang, Hao, Li, Meng-Ping, Zhang, Xin, Ma, Xiao-Hua, and Xu, Zhen-Liang
- Abstract
Layered double hydroxides (LDHs) are typical two-dimensional nanomaterials, which can be easily modified to serve molecular transport channels for improving membrane’s performances. In this study, two types of LDHs, namely citric acid (CA) intercalated LDHs and carbon dots (CDs) intercalated LDHs, have been synthesized and used as nonofillers to modify polyamide (PA) thin-film composite reverse osmosis membranes. The influence of different concentrations of LDHs on the physicochemical properties and morphologies of the RO membranes was investigated. The chemical composition of the membranes was measured by Fourier transform infrared spectroscopy and the morphologies of the modified RO membranes were studied by scanning electron microscopy, transmission electron microscopy, and atomic force microscopy. The obtained membranes exhibited sparser leaf-like structures, resulting in a flux of 33.2 L m-2h-1, approximately 36% improvement compared with the unmodified membrane. Our results showed that LDHs modified PA membranes could effectively improve the permeability of the membrane.
- Published
- 2020
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24. Far-infrared properties of cyclic olefin copolymer
- Author
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Wollack, Edward J., Denis, Kevin L., Barlis, Alyssa, Chang, Meng-Ping, Kutyrev, Alexander S., Miller, Kevin H., and Nagler, Peter C.
- Abstract
Cyclic olefin copolymer (COC) is an amorphous thermoplastic with desirable dielectric and mechanical characteristics for optical applications. In particular, its low refractive index, overall mechanical strength, and absence of strong absorption features make it a promising substrate material for far-infrared applications, which include frequency-selective surfaces, scattering filters, and windows. The dielectric properties of selected COC formulations are surveyed from $ \approx 10 - 700\,\, {{\rm cm}^{ - 1}} $≈10−700cm^−1 ($ 1000 - 14\,\, \unicode{x00B5} {\rm m} $1000−14µm), and representative usage as a thin film membrane structure in optical filters is presented.
- Published
- 2020
25. Ultrafast Visual Detection of a Trace Amount of Water by Highly Efficient Hybrid Manganese Halides
- Author
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Zhang, Jie, Ren, Meng-Ping, Xu, Man, Zhang, Zhonghui, An, Mingxue, Lu, Yang, Lei, Xiao-Wu, Gong, Zhongliang, and Yue, Cheng-Yang
- Abstract
A quantitative water detection method is urgently needed in storage facilities, space exploration, and the chemical industry. Although numerous physical techniques have been widely utilized to determine the water content, they still suffer from many disadvantages such as highly expensive special instruments, complicated analysis processes, etc. Hence, a convenient, rapid, and sensitive water analysis method is highly desirable. Herein, we developed a visual fluorescence sensing technology for water detection based on reversible PL off-on switching of organic–inorganic hybrid zero-dimensional (0D) manganese halides. In this work, a family of hybrid manganese halides were synthesized through a facile solution method, namely, [NH4(18-Crown-6)]2MnBr4, [Ca(18-Crown-6)·3H2O](18-Crown-6)MnBr4, [NH4(dibenzo-18-Crown-6)]2MnBr4, and [Ca(dibenzo-18-Crown-6)·2H2O]MnBr4. Excited by UV light, these highly crystalline manganese halides exhibit strong green light emissions from the d–d electron transition of Mn2+with near-unity photoluminescence quantum yield and submillisecond lifetime. Benefiting from the dynamic and weak ionic bonding interactions, these 0D manganese halides display reversible water-response on/off luminescence switching but fail in any other aprotic solvents. Therefore, these 0D hybrid manganese halides can be explored as ultrafast visual fluorescence probes to detect the trace amount of water in organic solvents with multiple superiorities of rapid response time (< 2 s), ultralow detection limit (9.71 ppm), excellent repeatability, etc. The reversible water-response luminescent on/off switching also provides a binary optical gate with advanced applications in anticounterfeiting and information security, etc.
- Published
- 2024
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26. ipso-Nitration of Arylboronic Acids with Copper Nitrate and Trifluoroacetic Acid
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Wang, Zhu-Qing, Guo, Meng-Ping, Wen, Yong-Ju, Shen, Xiu-Li, Lv, Mei-Yun, and Zhou, Xiu-Ling
- Abstract
An efficient and novel nitrating reagent has been developed for ipso-nitration of arylboronic acids. By using inexpensive and commercially available Cu(NO3)2/CF3COOH as nitrating reagent, various nitroarenes are produced in moderate to excellent yields (51-96%). Advantages of this procedure are the operational simplicity and no need of extra catalyst.
- Published
- 2018
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27. Vaccine-induced antigen-specific regulatory T cells attenuate the antiviral immunity against acute influenza virus infection
- Author
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Lin, Pin-Hung, Wong, Weng-In, Wang, Yi-Lan, Hsieh, Meng-Ping, Lu, Chia-wen, Liang, Chieh-Yu, Jui, Sung-Hsiang, Wu, Fang-Yi, Chen, Pei-Jer, and Yang, Hung-Chih
- Abstract
Peptide-based T cell vaccines targeting the conserved epitopes of influenza virus can provide cross-protection against distantly related strains, but they are generally not immunogenic. Foreign antigen-specific regulatory T (Treg) cells are induced under subimmunogenic conditions peripherally, although their development and role in vaccine-mediated antiviral immunity is unclear. Here, we demonstrated primary vaccination with peptides alone significantly induced antigen-specific Foxp3+Treg cells, which were further expanded by repeated vaccination with unadjuvanted peptides. Certain adjuvants, including CpG, suppressed the induction and expansion of antigen-specific Treg cells by peptide vaccination. Interestingly, secondary influenza virus infection significantly increased the frequency of preexisting antigen-specific Treg cells, although primary infection barely induced them. Importantly, specific depletion of vaccine-induced antigen-specific Treg cells promoted influenza viral clearance, indicating their inhibitory role in vivo. Immunization with CpG-adjuvanted peptides by the subcutaneous prime–intranasal-boost strategy restricted the recruitment and accumulation of antigen-specific Treg cells in lung, and stimulated robust T cell immunity. Finally, subcutaneous prime–intranasal-boost immunization with CpG-adjuvanted peptides or whole-inactivated influenza vaccines protected mice from heterosubtypic influenza virus infection. In conclusion, antigen-specific Treg cells induced by peptide vaccines attenuate the antiviral immunity against influenza virus infection. CpG-adjuvanted peptide vaccines provide heterosubtypic influenza protection probably by inhibiting Treg development and enhancing T cell immunity.
- Published
- 2018
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28. Vaccine-induced antigen-specific regulatory T cells attenuate the antiviral immunity against acute influenza virus infection
- Author
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Lin, Pin-Hung, Wong, Weng-In, Wang, Yi-Lan, Hsieh, Meng-Ping, Lu, Chia-wen, Liang, Chieh-Yu, Jui, Sung-Hsiang, Wu, Fang-Yi, Chen, Pei-Jer, and Yang, Hung-Chih
- Abstract
Peptide-based T cell vaccines targeting the conserved epitopes of influenza virus can provide cross-protection against distantly related strains, but they are generally not immunogenic. Foreign antigen-specific regulatory T (Treg) cells are induced under subimmunogenic conditions peripherally, although their development and role in vaccine-mediated antiviral immunity is unclear. Here, we demonstrated primary vaccination with peptides alone significantly induced antigen-specific Foxp3+Treg cells, which were further expanded by repeated vaccination with unadjuvanted peptides. Certain adjuvants, including CpG, suppressed the induction and expansion of antigen-specific Treg cells by peptide vaccination. Interestingly, secondary influenza virus infection significantly increased the frequency of preexisting antigen-specific Treg cells, although primary infection barely induced them. Importantly, specific depletion of vaccine-induced antigen-specific Treg cells promoted influenza viral clearance, indicating their inhibitory role in vivo. Immunization with CpG-adjuvanted peptides by the subcutaneous prime–intranasal-boost strategy restricted the recruitment and accumulation of antigen-specific Treg cells in lung, and stimulated robust T cell immunity. Finally, subcutaneous prime–intranasal-boost immunization with CpG-adjuvanted peptides or whole-inactivated influenza vaccines protected mice from heterosubtypic influenza virus infection. In conclusion, antigen-specific Treg cells induced by peptide vaccines attenuate the antiviral immunity against influenza virus infection. CpG-adjuvanted peptide vaccines provide heterosubtypic influenza protection probably by inhibiting Treg development and enhancing T cell immunity.
- Published
- 2018
- Full Text
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29. High-lift siphon flow velocity in a 4-mm siphon hose
- Author
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Mei, Cheng, Liang, Xu, Sun, Hong-yue, and Wu, Meng-ping
- Abstract
High-lift siphon drainage by 4-mm internal diameter siphon hoses is a real-time, free-power, and long-term approach for slope drainage. The conventional hydraulics formula for pressurized pipe flow is generally used to calculate the single-phase velocity of siphon flow. However, an intensive cavitation phenomenon occurs in the high-lift siphon hose and then a two-phase flow is formed. Research on the velocity of high-lift siphon flow is a prerequisite for the application of siphon drainage with a 4-mm siphon hose. Few investigations of this subject have been carried out. Hence, experiments on the high-lift (8 m≤H0≤10.3 m) siphon drainage in a 4-mm siphon hose were performed. The characteristics of siphon flow under different conditions were observed and test data were obtained. Comparisons between test results and calculated results showed that significant errors were given by the hydraulics formula. It is demonstrated that the effect of gas in a siphon hose should be included in the calculation of flow velocity. The findings can be used to determine the number of siphon hoses and layout of siphon drainage holes, and provide valuable information for geotechnical companies.
- Published
- 2017
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30. 城市绿地系统内外CO2 浓度、δ13C、δ18O 差异和来源及影响因素.
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Shou-jia, SUN, MENG Ping, Jin-song, ZHANG, Jian-hua, SHU, and ZHENG Ning
- Abstract
Copyright of Chinese Journal of Applied Ecology / Yingyong Shengtai Xuebao is the property of Chinese Journal of Applied Ecology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2015
31. Variations of CO2 concentration and δ13C and influencing factors of Quercus variabilis plantation in low hilly area of North China.
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SUN Shou-jia, MENG Ping, ZHANG Jin-song, ZHENG Ning, HE Chun-xia, and LI Yan-quan
- Abstract
The off-axis integrated cavity output spectroscopy technique was used to measure air CO
2 concentration and stable carbon isotope ratio (δ13 C) above (11 m) and at the bottom (6 m) of canopy of a Quercus variabilis plantation in a low hilly area of North China. The variations of CO2 concentration and δ13 C value in Q. variabilis plantation canopy and the influencing factors were analyzed at hourly timescale. The results showed that diurnal variation in the CO2 concentration had a trend, while there was no obvious similar tendency in the diurnal change of δ13 C value. Daytime atmosphere stability frequency during the experiment time was 70.2%. With the combined effects of photosynthesis and turbulent in the canopy, CO2 concentration at the bottom of canopy was 1.70 μmol · mol-1 higher than that above the canopy, while the δ13 C value was 0.81%c lower than that above the canopy. Atmosphere stability frequency was 76.2% at night. The CO2 from leaf was not easy to move because of weak turbulent. Thus, CO2 concentration at the bottom of canopy was 1.24 μmol · mol-1 higher than that above canopy, while the δ13 C value was 0.58%c lower than that above canopy. The difference of CO2 concentration between above and at the bottom of the canopy was strongly correlated with their δ13 C difference both in daytime and at nighttime. Stepwise regression analysis indicated that solar radiation and relative humidity in daytime were the main environmental factors causing CO2 concentration and δ13 C difference between above and at the bottom of the canopy, whereas at nighttime temperature was a key environmental factor influencing δ13 C value. The above environmental factors strongly influenced CO2 concentration and δ13 C value in air above and at the bottom of Q. variabilis plantation canopy by increasing or decreasing photosynthesis and respiration. [ABSTRACT FROM AUTHOR]- Published
- 2015
32. Zebrafish Cdh5 negatively regulates mobilization of aorta-gonad-mesonephros-derived hematopoietic stem cells
- Author
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Meng, Ping, Liu, Yongxiang, Chen, Xiaohui, Zhang, Wenqing, and Zhang, Yiyue
- Published
- 2016
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33. Silicon-based antenna-coupled polarization-sensitive millimeter-wave bolometer arrays for cosmic microwave background instruments
- Author
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Holland, Wayne S., Zmuidzinas, Jonas, Rostem, Karwan, Ali, Aamir, Appel, John W., Bennett, Charles L., Brown, Ari, Chang, Meng-Ping, Chuss, David T., Colazo, Felipe A., Costen, Nick, Denis, Kevin L., Essinger-Hileman, Tom, Hu, Ron, Marriage, Tobias A., Moseley, Samuel H., Stevenson, Thomas R., U-Yen, Kongpop, Wollack, Edward J., and Xu, Zhilei
- Published
- 2016
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34. Novel pH-Sensitive Poly(Vinyl Alcohol) Based Polyampholyte as Pervaporation Membrane
- Author
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Meng, Ping Rui and Li, Liang Bo
- Abstract
Sodium acrylate (NaAA) and acrylamide (AM) were grafted onto poly (vinyl alcohol) (PVA) using potassium persulfate as an initiator, Graft copolymerization namely poly (vinyl alcohol)-g-poly (acrylamide/sodium acrylate) (PVA-g-PAM/SAC). The poly (vinyl alcohol)-g-poly (vinylamine/sodium acrylate) (PVAMC) was prepraed by Hofmann rearrangement.The PVAMC homogeneous membrane was characterized by fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM).The water resistance of the PVAMC membranes is the best when pH of the PVAMC solutions was 4, at that time the numbers of-NH
3 + and-COO- groups trended to be equal, so the isoelectric point was pH=4. At 90 °C the pervaporation of PVAMC composite membrane was tested and showed that the separation factor and the permeate flux were about 1001 and 1341 g/(m2 ·h) for 90wt% ethanol aqueous solution, and they were about 1297 and 1040 g/(m2 ·h) for 90wt% isopropanol aqueous solution.- Published
- 2016
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35. Genetic variations in vitamin D receptor were associated with the outcomes of hepatitis C virus infection among Chinese population
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Wu, Meng-ping, Zhang, Jin-wei, Huang, Peng, Han, Ya-ping, Zhang, Yun, Peng, Zhi-hang, Wang, Jie, Zhu, Ping, Su, Jing, Yu, Rong-bin, Li, Jun, and Yue, Ming
- Abstract
Vitamin D has been considered as an immune modulator, and exerted the effect through the vitamin D receptor (VDR). This study investigated the associations of single-nucleotide polymorphisms (SNPs) of VDRwith the outcomes of Hepatitis C virus (HCV) infection. Three SNPs (rs2228570, rs757343 and rs739837) were genotyped by TaqMan assay among Chinese population, including 538 HCV spontaneous clearance subjects, 834 persistent infection subjects and 1030 uninfected subjects. Binary logistic analyses were used to control the effects of confounding factors. The results showed that subjects with the rs757343 A allele and rs739837 A allele had the significantly reduced risk of HCV susceptibility (all PBonferroni<0.05 in dominant/additive model). In the stratified analysis, the protection of rs757343 A allele and rs739837 A allele against HCV infection remained effective in some subgroups. In addition, patients carrying rs739837 CA genotype were less prone to develop persistent infection (PBonferroni=0.033) and such effect still work in several subgroups in the stratified analysis. Furthermore, haplotype analysis indicated that when compared with the most frequent GC haplotype, the haplotype carrying AA (odds ratio (OR)=0.66, 95% confidence interval (CI)=0.56–0.78) and GA (OR=0.64, 95% CI=0.47–0.85) suggested a protective effect. Our findings indicated that the polymorphisms of VDRare associated with the outcomes of HCV infection among Chinese population.
- Published
- 2016
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- View/download PDF
36. Effects of drought stress on growth and water use efficiency of two medicinal plants.
- Author
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CHEN Ping, MENG Ping, ZHANG Jin-song, HE Chun-xia, JIA Chang-rong, and LI Jian-zhong
- Abstract
Growth characteristics, stable carbon isotope discrimination (Δ
13 C), water use efficiency (WUE), and their correlation of Cassia obtusifolia and Isatis indigotica were measured at three soil water levels, i. e. , 30%, 50% and 75% of field water holding capacity (FWHC), and at three growth stages. The growth indices of the two medicinal plants at 75% of FWHC were higher than those at 30% and 50% of FWHC, suggesting that the two medicinal plants could obtain high production under sufficient moisture condition. The Δ13 CA(aboveground biomass-based Δ13 C) and Δ13 CT (total biomass-based Δ13 C) decreased, and the WUEA (aboveground biomass-based WUE) and WUET (total biomass-based WUE) of C. obtusifolia and I. indigotica increased with the increasing degree of drought stress. The growth indices of the two medicinal plants had little difference in the different water treatments, which indicated that the two medicinal plants were insensitive to drought stress. Water use efficiency of I. indigotica had significant negative relationships with aboveground biomass and total biomass, while that of C. obtusifolia had a significant positive correlation with the root/ shoot ratio. [ABSTRACT FROM AUTHOR]- Published
- 2014
37. Soil quality assessment of Robinia psedudoacia plantations with various ages in the Grain-for-Green Program in hilly area of North China.
- Author
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ZHAO Na, MENG Ping, ZHANG Jin-song, LU Sen, and CHENG Zhi-qing
- Abstract
Four land use types of cropland, abandoned cropland, 10-year-old and 43-year-old Robinia psedudoacia plantations in the Grain-for-Green Program in hilly area of North China were studied to investigate the effects of returning cropland to forestland on soil quality by using integrated soil quality index. The results showed that the nutrients of topsoil increased significantly with increasing tree age, and soil properties in 0-5 cm soil layer improved. Compared with the cropland, soil physical and chemical properties of the two R. psedudoacia plantations improved, and the soil microbial biomass C and N increased significantly. The integrated soil quality index decreased in order of 43-year-old R. psedudoacia plantation (0. 542) >10-year-old R. psedudoacia plantation (0.536)> the abandoned cropland (0. 499)> the cropland (0. 498), suggesting the soil quality was improved during the conversion from cropland to forestland. [ABSTRACT FROM AUTHOR]
- Published
- 2014
38. Wall Insulation Effect on Building Energy Efficiency with the Intermittent and Compartmental Energy Consuming Method
- Author
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Ruan, Fang, Qian, Xiao Qian, Zhu, Yao Tai, Wu, Min Li, Qian, Kuang Liang, and Feng, Meng Ping
- Abstract
Based on the intermittent and compartmental energy consuming method of residential buildings in Hot Summer and Cold Winter Zone, a two-dimensional heat transfer model of one household flat is built for a transient study of the wall insulation effect on building energy efficiency. With the mode of compartmental energy consuming, the energy consumption of interior walls accounts for nearly 45% of the total amount, thus insulation for interior walls should be taken into more consideration as well as for exterior walls. With the intermittent energy consuming mode, exterior wall external insulation can decrease air-conditioner heating load. However, when cooling in summer nights, the temperature of wall is higher than both indoor and outdoor. External insulation hinders heat in walls from dissipating to outside, and thus there is an “anti-insulation” effect existing here. Interior insulation can effectively decrease both heating and cooling loads of air-conditioner.
- Published
- 2015
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39. Evaluation Method for Energy Saving Effect of Reflective Thermal Insulation Coatings
- Author
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Feng, Meng Ping, Qian, Xiao Qian, Zhu, Yao Tai, and Ruan, Fang
- Abstract
According to the climate and energy saving characteristics in the hot summer and cold winter zone, especially in view of requirements for thermal insulation in summer, reflective thermal insulation coatings (RTIc) are gradually applied in building energy efficiency of exterior envelope. A feasible evaluation method for energy saving effect is very important for acceptance of energy efficient building construction. In this paper, thermal resistance has been used as the evaluation index. The energy efficiency of the reflective thermal insulation coatings was investigated. Four hot boxes were applied contrast test. Based on the qualitative and quantitative analysis of electricity consumption within 36 hours and comparative analysis of heating process simulating sunlight environment, thermal resistance of RTIc can be calculated on the basis of the correlation between power saving rate and thermal resistance so that energy saving effect of RTIc can be quantitatively characterized.
- Published
- 2015
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40. Study on the Preparation of Starch-Based Polyampholyte and Slow Release Performance
- Author
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Meng, Ping Rui and Li, Liang Bo
- Abstract
The starch-based polyampholyte (SPAM) was synthesized by graft copolymerization of starch with acrylamide (AM) and acrylic acid (AA). The structural and chemical characteristics of the product, as well as its efficiency in slowing the nitrogen release and water evaporation in soil were examined. The slow-release effect of SPAM was better than starch, starch-g-SPAC (Sodium polyacrylate) and starch-g-PVAC (Polyvinyl ammonium chloride) for urea release, particularly when the pH of SPAM solution was equal to 5(approached or equaled to isoelectric point, IEP). These studies showed that the product with good slow-release and being environmentally friendly is biodegradable carrier materials.
- Published
- 2014
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41. Luteolin Imprinted Polymer with Selective Recognition and Adsorption Performance
- Author
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Meng, Ping Rui and Li, Liang Bo
- Abstract
In order to selectively separate luteolin from its crude solution, we synthesized luteolin molecular imprinted polymers (LMIP) with high recognition specificity for luteolin, using an imprinting technique. Luteolin was used as template, methanol as solvent, and N,N’-methylenebisacrylamide (MBAA) as the cross-linking. Then prepared LMIP were characterized and evaluated by scanning electron microscope (SEM) and equilibrium absorption experiments. The results showed that the cavities matching with the template molecules in size and structure were present in the LMIP. Adsorption dynamics analysis suggested that, when the adsorption time reached 4 h, the adsorption process had reached balance and the adsorption capacity was at steady state. The selective adsorption amount reached at 35.65 umol/g for the LMIP, while a lower value of 11.68 umol/g for the blank polymer (i.e. nontemplated). Relative to the corresponding blank polymer, LMIP had an excellent recognition to luteolin in methanol solution. Keywords: Molecular imprinting, Molecular recognition, Adsorbent, Luteolin
- Published
- 2014
- Full Text
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42. Diurnal variation of Quercus variabilis trunk diameter in response to environmental factors at south aspect of Taihang Mountains.
- Author
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SUN Shou-jia, MENG Ping, ZHANG Jin-song, JIA Chang-rong, and REN Ying-feng
- Abstract
By using Circumference Dendrometer 2 (DC2), this paper studied the diurnal variation of trunk diameter in Quercus variabilis plantation at the south aspect of Taihang Mountains. During seasonal drought, the diurnal variation of Q. variabilis trunk diameter was quite evident. The time of the diameter shrinkage followed the startup time of sap flow, but the appearance of the minimum trunk diameter lagged behind the maximum sap flow flux about 3-4 h. The maximum daily shrinkage (MDS) value of the trunk diameter presented a trend low-high-low, being significantly correlated with the diurnal differences of cumulative sap flow flux and leaf water potential and having a significant quadratic relationship with soil moisture content. The MDS value was affected by the variations of meteorological factors, being significantly correlated with the diurnal variations of air temperature, vapor pressure deficit, and relative humidity, but less correlated with the diurnal variation of solar radiation. After successive precipitation, soil moisture content was no longer the limiting factor of the diurnal variation of Q. variabilis trunk diameter. The MDS value had less correlations with the diurnal differences of cumulative sap flow flux, leaf water potential, soil moisture content, and other meteorological factors. Stepwise regression analysis indicated that the soil moisture content and air temperature in seasonal drought and rain seasons were the key factors affecting the diurnal variation of Q. variabilis trunk diameter. [ABSTRACT FROM AUTHOR]
- Published
- 2012
43. Clinical Analysis of 19 Cases of Adult Primary Mediastinal Liposarcoma.
- Author
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Su Kai, Cheng Gui-yu, Liu Xiang-yang, Meng Ping-jun, Zhao Jun, Chen Xin-jie, and He Jie
- Published
- 2012
- Full Text
- View/download PDF
44. Variations of canopy temperature in Quercus variabilis plantation and their relations with micrometeorological factors.
- Author
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Wei Dan-dan, Zhang Jin-song, Meng Ping, Zheng Ning, Li Chun-you, and Ren Ying-feng
- Abstract
Based on the canopy temperature and micrometeorological data of Quercus variabilis in its main growth season (from May to August) in hilly areas of North China in 2011, this paper analyzed the variations of canopy temperature (T
c ) in Q. variabilis plantation and their relations with micrometeorological factors in typically clear days and cloudy days. From 9:00 to 17:00 in clear days, the boundary layer of canopy was unstable, and the mean Tc was 3. 55 °C higher than the mean air temperature (Ta ). In cloudy days, the variations of Tc were gentler than those in clear days. The Tc was significantly correlated with Ta , net solar radiation (Rn), relative humidity, and wind speed, with a multiple correlation coefficient being 0. 825. The Ta and Rn were the dominant meteorological factors controlling Tc , and their affecting degree on Tc was associated with weather condition. [ABSTRACT FROM AUTHOR]- Published
- 2012
45. Measurement accuracy of Granier calibration based on transpiration of Platycladus orientalis.
- Author
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Liu Qing-xin, Meng Ping, Zhang Jin-song, Gao Jun, Sun Shou-jia, and Jia Chang-rong
- Abstract
In order to understand the accuracy of Granier's thermal dissipation method in measuring tree water consumption, a comparative study was made from May to June, 2010. The sap flow density of potted Platycladus orientalis was measured with thermal dissipation probe, which was compared with the whole-plant gravimetric measurement. There were significant linear relationships (R
2 >0. 825) between the sap flow velocity in both north and south directions of P. orientalis measured by thermal dissipation probe and the transpiration rate measured by gravimetric method. The average daily sap flux in the north and south directions of P. orientalis were 10. 6% and 15. 1% lower than the daily average transpiration of P. orientalis, respectively, but the differences were not significant. Therefore, Granier's method had high reliability in the measurement of P. orientalis transpiration at daily scale, though the large temperature fluctuation between day and night could result in a lower daily sap flux than daily transpiration. [ABSTRACT FROM AUTHOR]- Published
- 2012
46. Potential errors in measuring tree transpiration based on thermal dissipation method.
- Author
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Liu Qing-xin1, Meng Ping, Zhang Jin-song, Gao Jun, Huang Hui, Sun Shou-jia, and Lu Sen
- Abstract
Transpiration is a major component of vegetation evapotranspiration, and a core in the study of plant water physiological ecology. Its measurement methods attracted extensive attention, among which, thermal dissipation is considered as an optimal method for measuring tree transpiration. Numerous studies showed that thermal dissipation method was relatively accurate in measuring individual tree transpiration and stand-scale water consumption.However, there exist potential errors between the true value and the measurements during measurement process. In this paper, the potential errors of thermal dissipation method in measuring sap flux density and of the temperature difference determination from single tree to stand-scale were reviewed, and the research prospects on the potential errors of thermal dissipation method in China were discussed. The corresponding solutions were also proposed. [ABSTRACT FROM AUTHOR]
- Published
- 2011
47. Intravitreal Injection of Bevacizumab for the Treatment of Choroidal Neovascularization in a Patient with Angioid Streaks.
- Author
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Liu, Yu-Chi, Yang, Chang-Sue, Shyong, Meng-Ping, Lee, Fenq-Lih, and Lee, Shui-Mei
- Subjects
RETINAL diseases ,BEVACIZUMAB ,ANGIOID streaks ,VISUAL acuity ,TOMOGRAPHY ,HEMORRHAGE ,NEOVASCULARIZATION ,PATIENTS - Abstract
We report the favorable outcome of intravitreal injection of bevacizumab (Avastin) to treat choroidal neovascularization (CNV) secondary to angioid streaks in an 82-year-old Chinese man. Within 2 weeks of bevacizumab injection, visual acuity improved from 20/40 to 20/25 and optical coherence tomography revealed complete resolution of CNV and retinal edema. The juxtafoveal hemorrhage nearly disappeared, and the size of CNV markedly regressed from 1,200 mm to unre- markable on fluorescein angiography. These improvements were maintained after 2 additional doses of intravitreal bevacizumab administered at 4-week intervals. No ocular or systemic side effects were observed. Neither recurrent CNV lesion nor new hemorrhage was noted during 18 months of follow-up. The short-term results suggest that intravitreal injection of bevacizumab for the treatment of CNV in patients with angioid streak is well tolerated and highly effective. It may be a promising pharmacologic treatment option since limited therapies are available for this disease with a rather aggressive course. [Copyright &y& Elsevier]
- Published
- 2009
- Full Text
- View/download PDF
48. Modeling the response of negative air ions to environmental factors using multiple linear regression and random forest.
- Author
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Shi, Guang-Yao, Zhou, Yu, Sang, Yu-Qiang, Huang, Hui, Zhang, Jin-Song, Meng, Ping, and Cai, Lu-Lu
- Subjects
ANIONS ,RANDOM forest algorithms ,PARTICULATE matter ,REGRESSION trees ,MULTIPLE comparisons (Statistics) ,AIR pollutants ,HUMIDITY - Abstract
Negative air ion (NAI) plays a vital role in promoting the psychological and physiological functions of the human body and is an essential indicator for measuring the air cleanliness of a given area. In this paper, we presented and compared the results of two methods for identifying the main environmental factors affecting changes of NAI in a warm-temperate region of China. NAI concentration was estimated based on measured data during the main growing season in a warm-temperate forest and was used as the dependent variable in the traditional multiple linear regression and random forest models. Air pollutants and certain weather, radiation, and soil factors were selected as predictors based on their potential influence on NAI. Two methods were applied for the analysis, and the latter was a non-parametric alternative based on an ensemble of classification and regression trees. We compared the precision of the two models, and the variables of each method on the basis of their levels of importance; Independent samples was used in model validation, then we discussed the important environmental factors affecting changes of NAI concentration for both linear and nonlinear perspectives, along with the potential implications of environmental factors on NAI. The random forest model showed a higher accuracy comparison with the multiple linear regression model. Furthermore, the analysis also indicated its better performance by using independent test data for 10-fold cross-validation of the random forest model, and showing that this method has potential for broad-scale application in the assessment of environmental-factor influence on NAI. Certain selected variables that were common to both models (particulate matter 2.5, soil moisture, and relative humidity) appeared to influence NAI to a relatively large extent, demonstrating the decidedly influential role of these parameters on NAI concentration. • Two models are tested to optimize application in NAI–environmental factor influence. • Particulate matter, soil moisture, and relative humidity strongly influence NAI. • Random forest has high predictive ability and better model performance. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
49. Kilopixel backshort-under-grid arrays for the Primordial Inflation Polarization Explorer
- Author
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Holland, Wayne S., Zmuidzinas, Jonas, Jhabvala, Christine A., Benford, Dominic J., Brekosky, Regis P., Chang, Meng-Ping, Costen, Nicholas P., Datesman, Aaron M., Hilton, Gene C., Irwin, Kent D., Kogut, Alan J., Lazear, Justin, Leong, Edward S., Maher, Stephen F., Miller, Timothy M., Moseley, S. H., Sharp, Elmer H., Staguhn, Johannes G., and Wollack, Edward J.
- Published
- 2014
- Full Text
- View/download PDF
50. The Experimental Research on the Effect of Seepage Pressures on Seepage Time through Red Sandstone
- Author
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Sun, Qian Cheng, Zhang, Zhen Hua, Li, De Zhong, and Du, Meng Ping
- Abstract
The cyclic fluctuation of reservoir water level makes soft rock in bank slope under cyclic seepage pressure and will bring certain effects on permeability characteristics of the soft rock. In order to obtain the relationship between the seepage pressure and seepage time, permeability tests were conducted on red sandstone specimens (from Three Gorges Reservoir Area, China) under cyclic seepage pressures by the self-developed equipment with the function to simulate cyclic fluctuation of reservoir water level. Experimental results show that the water infiltration of the sample was not stable in first three cycles, and it changed from 0.444 mL to 0.086mL. After three cycles, the water infiltration fluctuated between 0.060mL and 0.069mL. It can be drawn that the seepage velocity increase with the raise of pressure and it fit a four times polynomial in each cycle. The study indicates that increasing the seepage pressure appropriately can improve the seepage velocity, and greatly shorten the seepage time.
- Published
- 2014
- Full Text
- View/download PDF
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