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- 저자 : Yunpeng Lin (검색결과 4 건)
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Zhi Li,Yunpeng Zhong,Danfeng Bai,Miaomiao Lin,Xiujuan Qi,Jinbao Fang 한국원예학회 2020 Horticulture, Environment, and Biotechnology Vol.61 No.5
Kiwifruit ( Actinidia sp.) vines are poorly adapted to waterlogging stress. Actinidia valvata is more tolerant against waterloggingstress than Actinidia deliciosa , and the latter contains some common rootstocks that are frequently used in kiwifruit cultivation. Little is known about the responses of A. valvata genotypes against waterlogging stress and during post-waterloggingrecovery. Here, we compared physiological traits of three A. valvata genotypes (KR1, KR3, and KR5) during waterloggingstress and recovery. Kiwifruit vines displayed water loss, a decline in the net photosynthetic rate, and inhibited shoot elongationduring waterlogging. These three genotypes could endure long-term waterlogging owing to their unique root systemconfi gurations as well as by sustaining carbohydrate reserves in the roots. Feeder roots of KR1 vines were damaged earlierand lost water more quickly than the other genotypes. Under the same stress, KR3 formed adventitious roots more rapidly,while KR5 had an improved ability to control water loss in above-ground tissues. After reoxygenation, growth of vineswas partially recovered due to water loss control, photosynthetic recovery, and carbohydrate replenishment. KR3 and KR5recovered their growth earlier and replenished more carbohydrates than KR1 after re-aeration. During waterlogging, both therelative water content and carbohydrate levels of vines can limit the recovery effi ciency after re-aeration. Our results revealedmutual and distinct responses of diff erent A. valvata genotypes during waterlogging stress and recovery and provided moreinsight into the physiological basis of their adaptation to waterlogging stress.
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Endothelial Progenitor Cells Correlated with Oxidative Stress after Mild Traumatic Brain Injury
Xintao Huang,Dahai Wan,Yunpeng Lin,Naizhao Xue,Jiehe Hao,Ning Ma,Xile Pei,Ruilong Li,Wenju Zhang 연세대학교의과대학 2017 Yonsei medical journal Vol.58 No.5
Purpose: Endothelial progenitor cells (EPCs) play a key role in tissue repair and regeneration. Previous studies have shown that infusion of human umbilical cord blood-derived endothelial colony-forming cells improves outcomes in mice subjected to experimentaltraumatic brain injury (TBI). However, the efficiency of cell transplantation is not satisfactory. Oxidative stress plays a significant role in the survival of transplanted cells following ischemic reperfusion injury. This observational clinical study investigatedthe correlation between the number of circulating EPCs and plasma levels of superoxide dismutase (SOD) and malonyldialdehyde(MDA). Materials and Methods: Peripheral blood samples were collected from 20 patients with mild TBI at day-1, day-2, day-3, day-4, and day-7 post TBI. The number of circulating EPCs and the plasma levels of SOD and MDA were measured. Results: The average of circulating EPCs in TBI patients decreased initially, but increased thereafter, compared with healthy controls. Plasma levels of SOD in TBI patients were significantly lower than those in healthy controls at day-4 post-TBI. MDA levels showed no difference between the two groups. Furthermore, when assessed on day-7 post-TBI, the circulating EPC number were correlated with the plasma levels of SOD and MDA. Conclusion: These results suggest that the number of circulating EPCs is weakly to moderately correlated with plasma levels of SOD and MDA at day-7 post-TBI, which may offer a novel antioxidant strategy for EPCs transplantation after TBI.
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Simulation of the irradiation effect on hardness of Chinese HTGR A508-3 steels with CPFEM
Junfeng Nie,Pandong Lin,Yunpeng Liu,Haiquan Zhang,Xin Wang 한국원자력학회 2019 Nuclear Engineering and Technology Vol.51 No.8
Understanding the irradiation hardening effect of structural steels under various irradiation conditions plays an important role in developing advanced nuclear systems. Such being the case, a crystal plasticity model for body-centered cubic (BCC) crystal based on the density of dislocations and irradiation defects is summarized and numerically implemented in this paper. Based on this model, nano-indentation hardness of Chinese A508-3 steels with ion irradiation is calculated. Very good agreement is observed between simulation and experimental data of several different irradiation doses subjected to various operating temperatures, from which, it can be concluded that indentation hardness increases with increasing irradiation dose at both room temperature and high temperature. Consequently, the validity of this model has been proved properly, and furthermore, the model established in this paper could guide the study of irradiation hardening effect and temperature effect to some extent.
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Hydrothermal Synthesis of La-Mn-hexaaluminates for the Catalytic Combustion of Methane
Xu, Jinguang,Zhijian Tian,Wang, Junwei,Yunpeng Xu,Zhusheng Xu,Lin, Liwn 한국화학공학회 2003 Korean Journal of Chemical Engineering Vol.20 No.2
Hydrothermal synthesis by using urea hydrolysis at 1.0~3.0MPa and 120~130℃ was employed to prepare Mn-substituted hexaaluminate catalysts for methane combustion. The results from DTA-MS demonstrated that CO^2-_3 and OH^- anions co-exist in the hydrothermal reaction. XRD reveals that the components of carbonates of carbonates and hydroxides in the hydrothermal reaction are more favorable than those in the(NH_4)_2CO_3 co-precipitation for the formation of the Mn-substituted hexaaluminate phase. After calcination at 1,200℃ for 2h, LaMnAl_11O_19 is the major phase of the catalyst prepared by the hydrothermal synthesis method while LaAlO_3 is the major one of the catalysts prepared by NH_4OH and (NH_4)_2CO_3 co-precipitation. The catalyst prepared by hydrothermal synthesis has higher activity than that prepared by NH_4OH and (NH_4)CO_3 co-precipitation. The major reason is that more Mn^2+ ions have incorporated into the hexaaluminate lattice. The effect of drying methods on the formation of hexaaluminate phase was also discussed.
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