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Search Results: 1 - 10 of 149929 matches for " Yi-Na Li "
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Research on Supply Chain Inventory Optimization and Benefit Coordination with Controllable Lead Time  [PDF]
Fei Ye, Yi-Na Li, Xue-Jun Xu, Jianhui Zhao
Journal of Service Science and Management (JSSM) , 2008, DOI: 10.4236/jssm.2008.11003
Abstract: In this paper, we propose two supply chain inventory models with controllable lead time, the first is proposed under centralized decision mode and the other is proposed under decentralized decision mode. The solution procedures are also suggested to get the optimal solutions. In addition, taking individual rationality into consideration, Shapely value method and MCRS method are used to coordinate the benefits of the vendor and the buyer. Numerical example is given to illustrate the results of the proposed models.
Supply chain coordination for "company + farmer" contract-farming with CVaR criterion
基于CVaR的"公司+农户"型订单农业供应链协调契约机制

YE Fei,LIN Qiang,LI Yi-na,
叶飞
,林强,李怡娜

系统工程理论与实践 , 2011,
Abstract: Thecompany + farmercontract-farming supply chain model consisting of one risk-neutral company and one risk-averse farmer is proposed and the conditional value-at-risk(CVaR) method is utilized to describe the objective decision function of risk-averse farmer.The farmer's optimal decision making behavior under decentralized supply chain is analyzed.The results show that the risk-averse farmer's optimal production quantity will be increased with the increasing of contract purchasing price and definitely less t...
阻塞流场与瞬变涡动相互作用的动力学研究
刁一娜 DIAO Yi-Na,李建平 LI Jian-Ping,罗德海 LUO De-Hai
大气科学 , 2004, DOI: 10.3878/j.issn.1006-9895.2004.06.09
Abstract: 借助于一个β通道正压模型,模拟了瞬变天气尺度扰动与大尺度阻塞流场相互作用,以及所形成的"Ω"型阻塞对风暴轴地带瞬变扰动涡列移动路径的影响,并用描述局地能量变化率的方程分析了能量收支情况的细致结构.结果表明,瞬变扰动在其与背景流场的相互作用过程中,在阻塞发展阶段,阻塞受到瞬变扰动涡的涡度和能量强迫,背景流场增强发展成为阻塞系统.对两种不同的阻塞流场背景下瞬变扰动能量变化的分析表明:在阻塞区扰动瞬变涡失去能量,在南北边缘瞬变扰动的能量变化趋势表现为沿着阻塞外围向下游传播的特征并从背景流场得到能量,从而瞬变涡动由源区的一列分裂为绕行于阻塞外围的两列.在两种不同背景阻塞流场结构下瞬变涡动的移动路径表现出不同的分布特征:当偶极子型阻塞作为背景流场时,瞬变涡动的移动路径呈南北对称分布于阻塞区的外缘;当瞬变涡的背景流场为"Ω"型阻塞时,瞬变扰动带受到"Ω"型阻塞流场结构的影响,表现出北支强南支弱的特征.这些结果与实际观测一致.
Knockout of CD8 Delays Reendothelialization and Accelerates Neointima Formation in Injured Arteries of Mouse via TNF-α Inhibiting the Endothelial Cells Migration
Jun-Meng Zhang, Ying Wang, Yan-Ju Miao, Yi Zhang, Yi-Na Wu, Li-Xin Jia, Yong-Fen Qi, Jie Du
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0062001
Abstract: Objective Delayed or impaired reendothelialization is a major cause of stent thrombosis in the interventional treatment of coronary heart disease. T cells are involved in neointima formation of injured arteries. However, the regulated mechanism of reendothelialization and the role of CD8 T cell in reendothelialization are unclear. Methods and Results Immunofluorescence staining showed that CD8 positive cells were increased in wire injured femoral artery of mice. On day 21 after injury, elastin staining showed that knockout of CD8 (CD8?/?) significantly increased intimal thickness and a ratio of intima to media by 1.8 folds and 1.9 folds respectively in injured arteries. Evans blue staining showed that knockout of CD8 delayed the reendothelialization area on day 7 after injury (18.8±0.5% versus 42.1±5.6%, p<0.05). In vitro, a migration assay revealed that CD8?/? T cells co-cultured with WT macrophages significantly inhibited the migration of the endothelial cells (ECs); compared to CD4+ T cells, and CD8+ T cells could promote the ECs migration. Furthermore, real-time PCR analysis showed that knockout of CD8 increased the level of tumor necrosis factor α (TNF-α) in injured arteries and cytometric bead cytokine array showed that TNF-α was elevated in cultured CD8?/? T cells. Finally, a wound-healing assay showed that recombinant TNF-α significantly inhibited the migration of ECs. Conclusion Our study suggested that CD8+ T cells could promote the reendothelialization and inhibit the neointima formation after the artery wire injury, and this effect is at least partly dependent on decreasing TNF-α production promoting ECs migration.
Anti-Hyperglycemic Effect of Chebulagic Acid from the Fruits of Terminalia chebula Retz
Yi-Na Huang,Dong-Dong Zhao,Bo Gao,Kai Zhong,Rui-Xue Zhu,Yan Zhang,Wang-Jun Xie,Li-Rong Jia,Hong Gao
International Journal of Molecular Sciences , 2012, DOI: 10.3390/ijms13056320
Abstract: In the present study, we firstly compared rat intestinal α-glucosidase inhibitory activity by different ethanol-aqueous extractions from the dried fruits of Terminalia chebula Retz. The enzymatic assay showed that the 80% ethanol extract was more potent against maltase activity than both 50% and 100% ethanol extracts. By HPLC analysis, it was determined that the 80% ethanol extract had a higher content of chebulagic acid than each of 50% or 100% ethanol extract. Next, we investigated how efficiently chebulagic acid could inhibit sugar digestion by determining the glucose level on the apical side of the Caco-2 cell monolayer. The result showed that the maltose-hydrolysis activity was down-regulated by chebulagic acid, which proved to be a reversible inhibitor of maltase in Caco-2 cells. On the other hand, chebulagic acid showed a weak inhibition of sucrose-hydrolysis activity. Meanwhile, chebulagic acid did not have an obvious influence on intestinal glucose uptake and was not effective on glucose transporters. Further animal studies revealed that the oral administration of chebulagic acid (100 mg/kg body weight) significantly reduced postprandial blood glucose levels by 11.1% in maltose-loaded Sprague-Dawley (SD) rats compared with the control group, whereas the oral administration of chebulagic acid did not show a suppressive effect on postprandial hyperglycemia in sucrose- or glucose-loaded SD-rats. The results presented here suggest that chebulagic acid from T. chebula can be used to control blood glucose and manage type?2?diabetes, although clinical trials are needed.
Expression of Organic Anion Transporting Polypeptide 1c1 and Monocarboxylate Transporter 8 in the Rat Placental Barrier and the Compensatory Response to Thyroid Dysfunction
Yi-na Sun, Yuan-jun Liu, Lu Zhang, Yan Ye, Lai-xiang Lin, Yong-mei Li, Yu-qin Yan, Zu-pei Chen
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0096047
Abstract: Thyroid hormones (THs) must pass from mother to fetus for normal fetal development and require the expression of placental TH transporters. We investigate the compensatory effect of placental organic anion transporting polypeptide 1c1 (Oatp1c1) and monocarboxylate transporter 8 (Mct8) on maternal thyroid dysfunction. We describe the expressions of these two transporters in placental barriers and trophoblastic cell populations in euthyroidism and thyroid dysfunction resulting from differential iodine nutrition at gestation day (GD) 16 and 20, that is, before and after the onset of fetal thyroid function. Immunohistochemistry revealed that in the blood-placenta barrier, these two TH transporters were strongly expressed in the villous interstitial substance and were weakly expressed in trophoblast cells. Levels of Oatp1c1 protein obviously increased in the placental fetal portion during maternal thyroid deficiency at GD16. Under maternal thyroid deficiency after the production of endogenous fetal TH, quantitative PCR analysis revealed down-regulation of Oatp1c1 occurred along with up-regulation of Mct8 in trophoblast cell populations isolated by laser capture microdissection (LCM); this was consistent with the protein levels in the fetal portion of the placenta. In addition, decreased D3 mRNA at GD16 and increased D2 mRNA on two gestational days were observed in trophoblast cells with thyroid dysfunction. However, levels of Oatp1c1 mRNA at GD16 and D3 mRNA at GD20 were too low to be detectable in trophoblast cells. In conclusion, placental Oatp1c1 plays an essential compensatory role when the transplacental passage of maternal THs is insufficient at the stage before the fetal TH production. In addition, the coordinated effects of Oatp1c1, Mct8, D2 and D3 in the placental barrier may regulate both transplacental TH passage and the development of trophoblast cells during thyroid dysfunction throughout the pregnancy.
Formation Process and Properties of Phytic Acid Conversion Coatings on Magnesium  [PDF]
Jian-Rui Liu, Yi-Na Guo, Wei-Dong Huang
Journal of Surface Engineered Materials and Advanced Technology (JSEMAT) , 2011, DOI: 10.4236/jsemat.2011.11003
Abstract: A chromium-free conversion coating treatment for magnesium by phytic acid solution was studied. The formation process of phytic acid conversion coating was studied through measuring the open circuit potential (OCP) and weight change of the pure magnesium in the different conversion treatment time. The morphologies and compositions of the coatings were determined by SEM and EDS respectively. The conversion coating has the multideck structure with netlike morphology which is similar to the chromate conversion coating, and is mainly composed of Mg, P, O and C. The contents of C and P and the size of the cracks in different layers decrease from the external layer to the inner layer. The hydroxyl groups and phosphate carboxyl groups in the coating which have the similar properties to organic paintcoat are beneficial to the combination of substrate and organic paintcoat. The formation mechanism and thickness variation of the conversion coatings are also discussed.
The status of noxious plants in lower subtropical region of China

Shao-Lin Peng,Bao-Ming Chen,Zhen-Guang Lin,You-Hua Ye,Yi-Na Yu,Jian-Li Li,Hai-Jia Lin,

生态学报 , 2009,
Abstract: Recent decades, more and more noxious plants developed fast in tropical and subtropical region. Guangdong Province, located in lower subtropical region, is densely populated and its economy is developing very quickly, it is vulnerable to be damaged. It was observed that there were many noxious plants affected forest ecosystem in this area. It is crucial to understand the destructive status and the distribution of the noxious plants. Thus, we conducted investigations of noxious plant in Baiyun Mountain and Xiqiao Mountain, Guangdong Province through point, line and plot methods. The results showed that there were 39 noxious plant species from 26 families in the two sites (Baiyun Mountain and Xiqiao Mountain). Most noxious plants reached III grade, 13 species reached III grade in Baiyun Mountain and 18 species reached III grade in Xiqiao Mountain. The exotic plant Wedelia trilobata(L.) Hitchc was the most abundant species, followed by another exotic plant Ipomoea cairica (Linn.) Sweet (Fig. 2B). All the 39 noxious plants covered over 273 hm2 in the two sites, about occupied 10% of the forests. Over 90% of the noxious plants are lianas, the rest are herbs or shrubs. Of the 39 noxious species, six species were exotic plants, while 33 species were indigenous, suggesting that more attention should be paid to indigenous plants when we concerned invasive plants. Furthermore, global climate change (e.g., global warming, elevated CO2) may shorten the latency of the plants and trigger the expansion of the noxious plants. Further studies are needed to reveal the relationship between global climate change and noxious plants, and to study why more and more native plants turned to threaten the ecosystem.
The Progress of Recombinant Escherichia coli for Production of Succinic Acid
重组大肠杆菌产琥珀酸研究进展

JIANG Min,MA Jiang-Feng,CHEN Ke-Quan,WANG Yi-Na,YU Li,
姜 岷
,马江锋,陈可泉,王益娜,于 丽

微生物学通报 , 2009,
Abstract: Succinic acid is regarded as C4 platform chemical, which has a huge potential market with wide applications in biopolymer, food, medicine, and so on. Production of succinic acid by microorganism fermentation has attracted much attention in recent times. By fermentation, succinic acid could be produced from renewable resources in place of petroleum with low cost and low pollution; especially CO2 could be fixed by microorganism to form the product, which is a promising way to deal with the green gas. Some E. coli have been chosen as good succinic acid producing strains because of their clear genetic backgrounds, convenience to be modified and controlled, and good growth properties with low nutrients requirements. The progress of genetic engineering strategy and metabolic engineering technology for construction of succinic aicd producing recombinant E. coli has been introduced in this paper with the discussion of the future research in this area.
Effects of Ipomoea cairica on Partial Physiological Indexes of Its Herbaceous Companion Species
五爪金龙对其草本伴生种部分生理指标的影响

ZHU Hui,MA Rui-Jun,WU Shuang-Tao,LI Yi-Na,LIN Xiu-Man,CHEN Dan-Sheng,
朱慧
,马瑞君,吴双桃,李伊娜,林秀曼,陈丹生

植物科学学报 , 2007,
Abstract: Relative conducity and chlorothyll content of the invasive weed Ipomoea cairica herbaceous companion species such as Polygonum chinense,Bidens pilosa,Oxalis corymbosa and Paederia scandens were mensurated in five different habitats by using the conductivity method and photometric method,and the blank comparison experiment was designed to analyze the above species being without I.cairica.The results showed that there was significant correlation between all companion species and uncompanion species of I.cairica at 0.01 or 0.05 level for chlorothyll content,change of relative conductivity wasn't distinct among three herbaceous companion species besides B.pilosa,which suggested that reducing chlorophyll content was one of the important mechanisms that I.cairica effected its herbaceous companion species,such as Polygonum chinense,O.corymbosa and Paederia scandens,otherwise,the effect mechanisms of I.cairica included reducing chlorothyll content and increasing membranous permeability to B.pilosa.
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