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641 results on '"Ding, Yanfeng"'

112. Sink Strength Promoting Remobilization of Non-Structural Carbohydrates by Activating Sugar Signaling in Rice Stem during Grain Filling

Author

Jiang, Zhengrong, primary, Chen, Qiuli, additional, Chen, Lin, additional, Liu, Dun, additional, Yang, Hongyi, additional, Xu, Congshan, additional, Hong, Jinzhi, additional, Li, Jiaqi, additional, Ding, Yanfeng, additional, Sakr, Soulaiman, additional, Liu, Zhenghui, additional, Jiang, Yu, additional, and Li, Ganghua, additional

Published
2022
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114. Unexpected Parabolic Temperature Dependency of CH4 Emissions from Rice Paddies

Author

Qian, Haoyu, primary, Zhang, Nan, additional, Chen, Junjie, additional, Chen, Changqing, additional, Hungate, Bruce A., additional, Ruan, Junmei, additional, Huang, Shan, additional, Cheng, Kun, additional, Song, Zhenwei, additional, Hou, Pengfu, additional, Zhang, Bin, additional, Zhang, Jun, additional, Wang, Zhen, additional, Zhang, Xiuying, additional, Li, Ganghua, additional, Liu, Zhenghui, additional, Wang, Songhan, additional, Zhou, Guiyao, additional, Zhang, Weijian, additional, Ding, Yanfeng, additional, van Groenigen, Kees Jan, additional, and Jiang, Yu, additional

Published
2022
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119. Acclimation of CH4 emissions from paddy soil to atmospheric CO2 enrichment in a growth chamber experiment

Author

Qian, Haoyu, primary, Jin, Yaguo, additional, Chen, Jin, additional, Huang, Shan, additional, Liu, Yunlong, additional, Zhang, Jun, additional, Deng, Aixing, additional, Zou, Jianwen, additional, Pan, Genxing, additional, Ding, Yanfeng, additional, Jiang, Yu, additional, van Groenigen, Kees Jan, additional, and Zhang, Weijian, additional

Published
2022
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122. Experimental Investigation of the Deformation and Failure Behavior of a Tunnel Excavated in Mixed Strata Using Transparent Soft Rock

Author

Tang Xiaojie, Yuanhai Li, Qi Zhang, Ding Yanfeng, and Shuo Yang

Subjects
Computer simulation, Shear (geology), Tunnel boring machine, Isotropy, Excavation, Geotechnical engineering, Slip band, Geology, Civil and Structural Engineering
Abstract

To investigate the deformation and failure behavior of a tunnel excavated in mixed strata, transparent soft rock test and numerical simulations were performed. The distribution features of displacement and failure and the evolution laws were analyzed. In this study, a transparent material for simulating mixed strata was developed. The visualization of the spatial deformation inside rock masses will improve the understanding of this process. The tests suggest that the mechanical properties of transparent soft rock are similar to those of natural rock. Experiments on the isotropic and mixed strata conditions were carried out to study the deformation rules during tunnel boring machine (TBM) excavation. The test results show that the dominant deformation position and direction exist in isotropic and mixed strata. A shear slip band occurs in both mixed and isotropic strata but with different distributions. Finally, numerical simulations were conducted to study the failure process, and the damage pattern of the transparent soft rock experiment was similar to that of the numerical simulation. The interface of the softness and hardness layers controls the extension of rock damage.

Published
2020

123. Subsurface banding of blended controlled-release urea can optimize rice yields while minimizing yield-scaled greenhouse gas emissions

Author

Li, Weiwei, Ahmad, Sajjad, Liu, Dun, Gao, Shen, Wang, Yuhui, Tao, Weike, Chen, Lin, Liu, Zhenghui, Jiang, Yu, Li, Ganghua, and Ding, Yanfeng

Abstract

Controlled-release urea (CRU) is widely reported to supply crop nitrogen (N) demand with one basal application, thus effectively replacing split applications of urea without diminishing grain yield and N use efficiency (NUE). However, its use for replacement for high-yield split applications of urea (CK) for rice is untested. In addition, the degree to which greenhouse gas (GHG) emissions in rice systems are affected when CRU is substituted for CK remains unclear. During 2017 and 2018, we sampled plant growth and gas emissions in a rice paddy field treated with three CRU types (sulfur-coated urea [SCU], polymer-coated urea [PCU], and bulk blended CRU [BBU]) applied via two methods (surface broadcasting on the soil and subsurface banding at 5 cm depth), with CK as a control. The three CRUs led to different soil NH4+-N dynamics, and the N supply pattern under BBU was more beneficial for rice seedling establishment than under SCU and PCU, resulting in grain yield and NUE comparable to those under CK. CRU type showed no significant effect on either CH4emissions or N2O emissions, and broadcast CRUs exhibited significantly higher total GHG emissions than CK. However, banded CRUs significantly reduced the total GHG emissions in comparison with broadcast CRUs, by 9.2% averaged across the two years. Reduced CH4emissions, particularly during the period prior to the middle drainage, contributed largely to the GHG difference. With comparably high grain yield and low total GHG emissions, banded BBU showed a low yield-scaled GHG (GHG emissions divided by grain yield) comparable to that under CK in both years. Overall, our study suggested that N management synchronized with rice demand and contributing to a high NUE tended to minimize yield-scaled GHG. Broadcast CRU can hardly substitute for CK in terms of either grain yield or GHG emissions, but banded BBU is a promising N management strategy for sustaining rice production while minimizing environmental impacts.

Published
2023
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128. Carbazate-modified cross-linked dextran microparticles suppress the progression of osteoarthritis by ROS scavenging

Author

Li Zheng, Ding Yanfeng, Guohua Yan, Yonglin Wang, Ying Chen, Maolin He, Bo Zhu, Ming Gao, Wei Yao, Hu Wenwen, Feng Xianjing, Jinmin Zhao, and Zhimin Li

Subjects
chemistry.chemical_classification, Reactive oxygen species, Superoxide, Radical, Biomedical Engineering, Inflammation, Dextrans, Hydrogen Peroxide, Polysaccharide, chemistry.chemical_compound, Dextran, Chondrocytes, Hydrazines, chemistry, Biochemistry, In vivo, Sephadex, Osteoarthritis, medicine, Humans, General Materials Science, medicine.symptom, Reactive Oxygen Species
Abstract

A series of modified polysaccharide microparticles have been fabricated and their potential application for scavenging reactive oxygen species (ROS) and their derivatives to achieve osteoarthritis (OA) treatment has been explored. These microparticles were cross-linked dextran (Sephadex) with different carbazate substitution ratios determined by the TNBS assay and elemental analysis. It has been demonstrated that they could effectively scavenge carbonylated proteins and ROS including hydroxyl radicals (˙OH), superoxide anions (˙O2-) and H2O2 and their derivatives with high efficiency, improve the viability of H2O2-treated chondrocytes by reducing their ROS levels, as well as lower their inflammatory factors. The above ability of antioxidation and inflammation resistance improved with the increase of carbazate substitution ratio. Significantly, this work provided the proof that modified Sephadex successfully alleviated the deterioration of cartilage and the progression of OA in vivo. The proposed microparticles showed a very promising capability for reducing ROS levels and further treating OA.

Published
2021

147. Elevated mitochondrial superoxide contributes to enhanced chemoreflex in heart failure rabbits

Author

Ding, Yanfeng, Li, Yu-Long, Zimmerman, Matthew C., and Schultz, Harold D.

Subjects
Chemoreceptors -- Physiological aspects, Chemoreceptors -- Research, Heart failure -- Risk factors, Heart failure -- Research, Mitochondrial DNA -- Physiological aspects, Mitochondrial DNA -- Research, Superoxide dismutase -- Measurement, Superoxide dismutase -- Physiological aspects, Superoxide dismutase -- Research, Biological sciences
Abstract

Peripheral chemoreflex sensitivity is enhanced in both clinical and experimental chronic heart failure (CHF). Here we investigated the role of manganese superoxide dismutase (MnSOD), the SOD isoform specially targeted to mitochondria, and mitochondrial superoxide levels in the enhanced chemoreceptor activity and function of the carotid body (CB) in CHF rabbits. CHF suppressed MnSOD protein expression and elevated mitochondrial superoxide levels in CB compared with that in sham CB. Adenovirus (Ad) MnSOD (1 x [10.sup.8] plaque-forming units/ml) gene transfer selectively to the CBs normalized mitochondrial superoxide levels in glomus cells from CHF CB. In addition, Ad MnSOD reduced the elevation of superoxide level in CB tissue from CHF rabbits. Ad MnSOD significantly increased MnSOD expression in CHF CBs and normalized the baseline renal sympathetic nerve activity and the response of renal sympathetic nerve activity to hypoxia in CHF rabbits. Ad MnSOD decreased baseline single-fiber discharge from CB chemoreceptors compared with Ad Empty (6.3 [+ or -] 1.5 vs. 12.7 [+ or -] 1.4 imp/s at ~100-Tort [Po.sub.2], P < 0.05) and in response to hypoxia (20.5 [+ or -] 1.8 vs. 32.6 [+ or -] 1.4 imp/s at ~40-Torr [Po.sub.2], P < 0.05) in CHF rabbits. Compared with Ad Empty, Ad MnSOD reversed the blunted [K.sup.+] currents in CB glomus cells from CHF rabbits (385 [+ or -] 11 vs. 551 [+ or -] 20 pA/pF at +70 mV, P < 0.05). The results suggest that decreased MnSOD in the CB and elevated mitochondrial superoxide levels contribute to the enhanced CB chemoreceptor activity and peripheral chemoreflex function in CHF rabbits. superoxide dismutase; mitochondrial superoxide levels; adenoviral vector; carotid body; chronic heart failure doi: 10.1152/ajpregu.00629.2009

Published
2010

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