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331篇 您的检索式:作者名="Huan Sun"
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1Sodium oligomannate therapeutically remodels gut microbiota and suppresses gut bacterial amino acids-shaped neuroinflammation to inhibit Alzheimer's disease progression显示文摘Recently,increasing evidence has suggested the association between gut dysbiosis and Alzheimer's disease(AD)progression,yet the role of gut microbiota in AD pathogenesis remains obscure.Herein,we provide a potential mechanistic link between gut microbiota dysbiosis and neuroinflammation in AD progression.Using AD mouse models,we discovered that,during AD progression,the alteration of gut microbiota composition leads to the peripheral accumulation of phenylalanine and isoleucine,which stimulates the differentiation and proliferation of pro-inflammatory T helper 1(Thl)cells.The brain-infiltrated peripheral Th1 immune cells are associated with the Ml microglia aaivation,contributing to AD-associated neuroinflammation.Importantly,the elevation of phenylalanine and isoleucine concentrations and the increase of Th1 cell frequency in the blood were also observed in two small independent cohorts of patients with mild cognitive impairment(MCI)due to AD.Furthermore,GV-971,a sodium oligomannate that has demonstrated solid and consistent cognition improvement in a phase 3 clinical trial in China,suppresses gut dysbiosis and the associated phenylalanine/isoleucine accumulation,harnesses neuroinflammation and reverses the cognition impairment.Together,our findings highlight the role of gut dysbiosis-promoted neuroinflammation in AD progression and suggest a novel strategy for AD therapy by remodelling the gut microbiota.Xinyi Wang Guangqiang Sun Teng Feng Jing Zhang Xun Huang Tao Wang Zuoquan Xie Xingkun Chu Jun Yang Huan Wang Shuaishuai Chang Yanxue Gong Lingfei Ruan Guanqun Zhang Siyuan Yan Wen Lian Chen Du Dabing Yang Qingli Zhang Feifei Lin Jia Liu Haiyan Zhang Changrong Ge Shifu Xiao Jian Ding Meiyu Geng 2019Cell Research2019,29,10:192
2MicroRNA-124 mediates the cholinergic anti-inflammatory action through inhibiting the production of pro-inflammatory cytokines显示文摘迷走神经神经能通过“一条胆碱能的反煽动性的小径”控制煽动性的反应,它被 α 调停; 7-nicotinic 醋胆素受体(α 7nAChR ) 在巨噬细胞上。然而,连接 α 的细胞内部的机制; 7nAChR 激活和支持 inflammatory cytokine 生产遗体不好理解。在这研究,我们发现 miR-124 是由在暴露 LPS 的房间和老鼠的胆碱能的收缩筋的 upregulated。利用 miR-124 模仿并且 siRNA 击倒,我们证明 miR-124 是为胆碱能的反煽动性的行动的一个批评调停人。而且,我们的数据显示 miR-124 由指向信号变换器和抄写 3 的使活跃之物(STAT3 ) 到减少 IL-6 生产和 TNF-α 调制导致 LPS 的 cytokine 生产;变换酶(不作声) 减少 TNF-α版本。这些结果也显示 miR-124 是为煽动性的疾病的处理的一个潜在的治疗学的目标。Yang Sun Qi Li Huan Gui Dong-Ping Xu Yi-LiYang Ding-Feng Su Xia Liu 2013Cell Research2013,23,11:35
3Epidemiology, causes, clinical manifestation and diagnosis, prevention and control of coronavirus disease (COVID-19) during the early outbreak period: a scoping review显示文摘Background:The coronavirus disease(COVID-19)has been identified as the cause of an outbreak of respiratory illness in Wuhan,Hubei Province,China beginning in December 2019.As of 31 January 2020,this epidemic had spread to 19 countries with 11791 confirmed cases,including 213 deaths.The World Health Organization has declared it a Public Health Emergency of International Concern.Methods:A scoping review was conducted following the methodological framework suggested by Arksey and O'Malley.In this scoping review,65 research articles published before 31 January 2020 were analyzed and discussed to better understand the epidemiology,causes,clinical diagnosis,prevention and control of this virus.The research domains,dates of publication,journal language,authors'affiliations,and methodological characteristics were included in the analysis.All the findings and statements in this review regarding the outbreak are based on published information as listed in the references.Results:Most of the publications were written using the English language(89.2%).The largest proportion of published articles were related to causes(38.5%)and a majority(67.7%)were published by Chinese scholars.Research articles initially focused on causes,but over time there was an increase of the articles related to prevention and control.Studies thus far have shown that the virus7 origination is in connection to a seafood market in Wuhan,but specific animal associations have not been confirmed.Reported symptoms include fever,cough,fatigue,pneumonia,headache,diarrhea,hemoptysis,and dyspnea.Preventive measures such as masks,hand hygiene practices,avoidance of public contact,case detection,contact tracing,and quarantines have been discussed as ways to reduce transmission.To date,no specific antiviral treatment has proven effective;hence,infected people primarily rely on symptomatic treatment and supportive care.Conclusions:There has been a rapid surge in research in response to the outbreak of COVID-19.During this early period,published research primarily explored the epidemiology,causes,clinical manifestation and diagnosis,as well as prevention and control of the novel coronavirus.Although these studies are relevant to control the current public emergency,more high-quality research is needed to provide valid and reliable ways to manage this kind of public health emergency in both the short-and long-term.Sasmita Poudel Adhikari Sha Meng Yu-Ju Wu Yu-Ping Mao Rui-Xue Ye Qing-Zhi Wang Chang Sun Sean Sylvia Scott Rozelle Hein Raat Huan Zhou 2020Infectious Diseases of Poverty2020,9,2:28
4Epidemiological characteristics of thyroid nodules and risk factors for malignant nodules: a retrospective study from 6 304 surgical cases显示文摘Huan Qin Wang Kun Lou Fuchen Zhang Li Huang Qingxian Han Yunfeng Sun Hancheng Zhu Lei Lin Peng Song Jun Liu Fuqiang Wang Qian Hou Weikai 2014Chinese Medical Journal2014,,12:20
5XingNaoJing injections protect against cerebral ischemia/reperfusion injury and alleviate blood-brain barrier disruption in rats, through an underlying mechanism of NLRP3 inflammasomes suppression显示文摘The aim of this study was to explore the neuroprotective effect and mechanism of XingNaoJing injections(XNJ) on cerebral ischemia injury and blood-brain barrier(BBB) disruption. Middle cerebral artery occlusion(MCAO) method was applicated to establish the model of cerebral ischemia/reperfusion(I/R) injury in rats. BBB permeability after I/R injury was assessed with the leaking amount of Evans Blue and the expression of occludin and ZO-1. The expression of NOD-like receptor family, pyrin domain containing(NLRP3) was checked to explore the inhibition of inflammation by XNJ. The results showed that XNJ could significantly increase the survival percent, decrease the infarct area and ameliorate neurological deficits and brain damage after I/R injury. Leaking amount of Evans Blue was reduced by XNJ, and the expression of tight junction protein, occludin and ZO-1 was also up-regulated by XNJ, which showed a role of protection on BBB disruption. The expression of NLRP3 was inhibited after exposure of XNJ, which was associated with inhibition of the inflammatory response. In summary, XNJ could suppress NLRP3 inflammasomes and improve BBB disruption and brain damage in rats after cerebral I/R injury, which provided a beneficial insight to further explore XNJ.QU Xiao-Yu ZHANG Yue-Ming TAO Li-Na GAO Huan ZHAI Jing-Hui SUN Jing-Meng SONG Yan-Qing ZHANG Si-Xi 2019Chinese Journal of Natural Medicines2019,17,7:20
6Coinfection with influenza A virus enhances SARS-CoV-2 infectivity显示文摘The upcoming flu season in the Northern Hemisphere merging with the current COVID-19 pandemic raises a potentially severe threat to public health.Through experimental coinfection with influenza A virus(IAV)and either pseudotyped or live SARS-CoV-2 virus,we found that IAV preinfection significantly promoted the infectivity of SARS-CoV-2 in a broad range of cell types.Remarkably,in vivo,increased SARS-CoV-2 viral load and more severe lung damage were observed in mice coinfected with IAV.Moreover,such enhancement of SARS-CoV-2 infectivity was not observed with several other respiratory viruses,likely due to a unique feature of IAV to elevate ACE2 expression.This study illustrates that IAV has a unique ability to aggravate SARS-CoV-2 infection,and thus,prevention of IAV infection is of great significance during the COVID-19 pandemic.Lei Bai Yongliang Zhao Jiazhen Dong Simeng Liang Ming Guo Xinjin Liu Xin Wang Zhixiang Huang Xiaoyi Sun Zhen Zhang Lianghui Dong Qianyun Liu Yucheng Zheng Danping Niu Min Xiang Kun Song Jiajie Ye Wenchao Zheng Zhidong Tang Mingliang Tang Yu Zhou Chao Shen Li Zhou Yu Chen Huan Yan Ke Lan Ke Xu 2021Cell Research2021,31,4:16
7Investigation of mental health and its influence on Chinese cancer patients using a multidisciplinary screening flow: an epidemiological survey in the west of China显示文摘SONG Huan LI Jin LU You DENG Lei SUN Xue-li 2013Chinese Medical Journal2013,,1:14
8Preliminary study on the production of transgenic mice harboring hepatitis B virus X gene显示文摘INTRODUCTIONDespiteoverwhelmingepidemiologicalevidencelinkingpersistentHepatitisBVirus(HBV)infectionandthedevelopmentofhepato...ZHU Huan Zhang 1, CHENG Guo Xiang 2, CHEN Jian Qu 2, KUANG Shu Yuan 3, CHENG Yong 2, ZHANG Xin Li 1, Ll Hou Da 2, XU Shao Fu 2, SHI Jing Quan 1, QIAN Geng Sun 3 and GU Jian Ren 3 1998World Journal of Gastroenterology1998,4,6:14
9Dynamic immune profiling identifies the stronger graft-versus-leukemia (GVL) effects with haploidentical allografts compared to HLA-matched stem cell transplantation显示文摘Haploidentical stem cell transplantation(haplo-SCT)achieves superior or at least comparable clinical outcomes to HLA-matched sibling donor transplantation(MSDT)in treating hematological malignancies.To define the underlying regulatory dynamics,we analyzed time courses of leukemia burden and immune abundance of haplo-SCT or MSDT from multiple dimension.First,we employed two nonirradiated leukemia mouse models which carried human AML-ETO or MLL-AF9 fusion gene to establish haplo-identical and major histocompatibility(MHC)-matched transplantation models and investigated the immune cell dynamic response during leukemia development in vivo.We found that haplo-matching the MHCs of leukemia cells with recipient mouse T cells prolonged leukemic mice survival and reduced leukemia burden.The stronger graft-versus-leukemia activity in haplo-SCT group mainly induced by decreased apoptosis and increased cytotoxic cytokine secretion including tumor necrosis factor–α,interferon-γ,pore-forming proteins and CD107a secreted by T cells or natural killer cells.Furthermore,we conducted a prospective clinical trial which enrolled 135 patients with t(8;21)acute myeloid leukemia that displayed minimal residual disease before transplantation and underwent either haplo-SCT or MSDT.The results showed that the haplo-SCT slowed the kinetics of the leukemia burden in vivo and reduced the cumulative incidence of relapse compared with MSDT.Ex vivo experiments showed that,1 year after transplantation,cytotoxic T lymphocytes from the haplo-SCT group had higher cytotoxicity than those from the MSDT group during the same period.Our results unraveled the role of immune cells in superior antileukemia effects of haplo-SCT compared with MSDT.Huidong Guo Ying-Jun Chang Yan Hong Lan-Ping Xu Yu Wang Xiao-Hui Zhang Ming Wang Huan Chen Yu-Hong Chen Feng-Rong Wang Wei-Han Yu-Qian Sun Chen-Hua Yan Fei-Fei Tang Xiao-Dong Mo Kai-Yan Liu Xiao-Jun Huang 2021Cellular & Molecular Immunology2021,18,5:11
10Anti-diabetic effects and mechanisms of action of a Chinese herbal medicine preparation JQ-R in vitro and in diabetic KKAy mice显示文摘Refined-JQ(JQ-R) is a mixture of refined extracts from Coptis chinensis(Ranunculaceae),Astragalus membranaceus(Leguminosae) and Lonicera japonica(Caprifoliaceae), the three major herbs of Jin Qi-Jiang Tang tablet, a traditional Chinese medicine(TCM) formula. The mechanisms by which JQ-R regulates glucose metabolism and improves insulin sensitivity were studied in type 2 diabetic KK^(Ay)mice and insulin-resistant L6 myotubes. To investigate the mechanisms by which JQ-R improves insulin sensitivity, a model of insulin-resistant cells induced with palmitic acid(PA) was established in L6 myotubes. Glucose uptake and expression of factors involved in insulin signaling, stress, and inflammatory pathways were detected by immunoblotting. JQ-R showed beneficial effects on glucose homeostasis and insulin resistance in a euglycemic clamp experiment and decreased fasting insulin levels in diabetic KK^(Ay)mice. JQ-R also improved the plasma lipid profiles. JQ-R directly increased the activity of superoxide dismutase(SOD) and decreased malondialdehyde(MDA) as well as inducible nitric oxide synthase(iNOS) levels in insulin-resistant L6 cells, and elevated the insulin-stimulated glucose uptake with upregulated phosphorylation of AKT. The phosphorylation levels of nuclear factor kappa B(NF-κB p65), inhibitor of NF-κB(IκBα), c-Jun N-terminal kinase(JNK1/2) and extracellular-signal-regulated kinases(ERK1/2) were also changed after JQ-R treatment compared with the control group. Together these findings suggest that JQ-R improved glucose and lipid metabolism in diabetic KK^(Ay)mice. JQ-R directly enhanced insulin-stimulated glucose uptake in insulin-resistant myotubes with improved insulin signalling and inflammatory response and oxidative stress. JQ-R could be a candidate to achieve improved glucose metabolism and insulin sensitivity in type 2 diabetes mellitus.Quan Liu Shuainan Liu Lihui Gao Sujuan Sun Yi Huan Caina Li Yue Wang Nan Guo Zhufang Shen 2017Acta Pharmaceutica Sinica B2017,7,4:11
11Relationship of particle stimulated nucleation,recrystallization and mechanical properties responding to Fe and Si contents in hot-extruded 7055 aluminum alloys显示文摘The variations of coarse intermetallic particles in hot-extruded 7055 aluminum alloys with 0.041 wt%Fe and 0.024 wt%Si increasing to 0.272 wt%Fe and 0.134 wt%Si were investigated.The particle stimulated nucleation(PSN)behaviors for different kind of coarse particles were detailly analyzed by EBSD.Moreover,the effect of PSN responding to Fe and Si contents on recrystallization and tensile properties of 7055 alloys was evaluated.With increasing Fe and Si contents,the size and number density of coarseη/S particles are reduced,while the number densities of coarse Al7Cu2 Fe and Mg2Si particles are both increased and the coarse Al7Cu2 Fe particles transform from rod-like to irregular.More PSN recrystallized grains with predominant orientations deviated from the extruded fiber textures are stimulated by the irregular Al7Cu2 Fe and Mg2Si particles,because a higher degree of local non-uniform deformation is produced.The rod-like Al7Cu2 Fe particles cause the greatest degree of local non-uniform deformation owing to the largest aspect ratio,but the shape also restricts the area of particle deformation zone(PDZ)resulting in fewer PSN recrystallized grains.The irregularη/S particles give rise to the lowest degree of local non-uniform deformation and fewest PSN recrystallized grains with the major orientations close to the extruded fiber textures.Consequently,despite the number and size of coarseη/S particles are reduced,the proportion of high angle grain boundaries(HAGBs)is increased and the extruded fiber textures are weakened with Fe and Si contents increasing,because of the increased Al7Cu2 Fe and Mg2Si particles.The strength is slightly declined by the weakened<111>//ED(extrusion direction)fiber texture,while the elongation is reduced for a larger number of coarse particles and more HAGBs with higher Fe and Si contents.Huan She Da Shu Anping Dong Jun Wang Baode Sun Hongchang Lai 2019Journal of Materials Science & Technology2019,35,11:10
12Potential of multi-pass ECAP on improving the mechanical properties of a high-calcium-content Mg-Al-Ca-Mn alloy显示文摘In this study,the multi-pass equal channel angular pressing(ECAP)was employed on a high-calcium-content Mg-Al-Ca-Mn alloy to tailor its microstructure and mechanical properties.The obtained results showed that the network-shaped Mg2Ca and(Mg,Al)2Ca eutectic compounds in as-cast alloy were gradually crushed into ultra-fine particles after ECAP,which exhibited a bimodal particle size distribution and most aggregated at original grain boundaries.Dynamic recrystallization(DRX)of α-Mg occurred during hot deformation via a particle stimulated mechanism,and the almost complete DRX with an average grain size around 1.5μm was obtained after 12p-ECAP.Moreover,abundant nano-sized acicular and spherical precipitates were dynamically precipitated withinα-Mg grains during ECAP.Tensile test results indicated that the maximum strength and ductility were acquired for 12p-ECAP alloy with ultimate tensile strength of 372 MPa and fracture elongation of 8%.The enhanced strength of the alloy could be ascribed to fine DRX grains,ultra-fine Ca-containing particles and dynamically precipitated nano-precipitates,while the improved ductility was mainly due to the refined and homogeneous microstructure,and weak texture with high average Schmid factors.He Huang Huan Liu Ce Wang Jiapeng Sun Jing Bai Feng Xue Jinghua Jiang Aibin Ma 2019Journal of Magnesium and Alloys2019,7,4:10
13Atorvastatin improves insulin sensitivity in mice with obesity induced by monosodium glutamate显示文摘Ning ZHANG Yi HUAN Hui HUANG Guang-ming SONG Su-juan SUN Zhu-fang SHEN 2010Acta Pharmacologica Sinica2010,31,1:9
14Nia1 and Nia2 are Involved in Exogenous Salicylic Acid-induced Nitric Oxide Generation and Stomatal Closure in Arabidopsis显示文摘Phytohormone salicylic acid (SA) plays important roles in plant responses to environmental stress. However, knowledge about the molecular mechanisms for SA affecting the stomatal movements is limited. In this paper, we demonstrated that exogenous SA significantly induced stomatal closure and nitric oxide (NO) generation in Arabidopsis guard cells based on genetic and physiological data. These effects were significantly inhibited by the NO scavenger c-PTIO, NO synthase (NOS) inhibitor L-NAME or nitrate reductase suppressor tungstate respectively, implying that NOS and nitrate reductase (NR) participate in SA-evoked stomatal closing. Furthermore, the effects of SA promotion of stomatal closure and NO synthesis are significantly suppressed in NR single mutants of nia1, nia2 or double mutant nia1/nia2, compared with the wild type plants. This suggests that both Nia1 and Nia2 are involved in SA-stimulated stomatal closure. In addition, pharmacological experiments showed that protein kinases, cGMP and cADPR are involved in SA-mediated NO accumulation and stomatal closure induced by SA in Arabidopsis.Fushun Hao Shiling Zhao Huan Dong Huan Zhang Lirong Sun Chen Miao 2010Journal of Integrative Plant Biology2010,52,3:8
15Preparation and Characterization of Flame Retardant and Low Smoke Releasing Oil-resistant EVA/NBR Blends显示文摘Nano-Si O2 and/or Mo O3 were introduced to ethylene-vinyl acetate/nitrile butadiene rubber(EVA/NBR) blends containing magnesium hydroxide(MH) and red phosphorus(RP) to further improve the mechanical properties, oil resistance, smoke suppression and flame retardancy. The results indicated that the tensile strength and oil resistance were significantly improved by incorporating nano-Si O2. Smoke suppression tests for EVA/NBR blend samples showed that both nano-Si O2 and Mo O3 can significantly reduce smoke release amount. The flammability characterization indicated that the blended sample with an LOI value of 33.0 could achieve V-0 level in the UL-94 test. Cone calorimetry test data showed the peak heat release rate was 67% lower than that for pure EVA/NBR. Thermal analysis showed that the presence of both nano-Si O2 and Mo O3 was beneficial to promoting char formation of the EVA/NBR blends. Char residual analysis suggested that Mo O3 aggregated in solid phase during combustion.Huan Zou Jun Sun Xiao-yu Gu Peng Jiang Xi-shan Liu 张胜 2015Chinese Journal of Polymer Science2015,33,4:8
16Endometrial MicroRNA Signature during the Window of Implantation Changed in Patients with Repeated Implantation Failure显示文摘Cheng Shi Huan Shen Li-Juan Fan Jing Guan Xin-Bang Zheng Xi Chen Rong Liang Xiao-Wei Zhang Qing-Hua Cui Kun-Kun Sun Zhu-Ran Zhao Hong-Jing Han 2017Chinese Medical Journal2017,,5:8
17Effects of ammonia exposure on carcass traits and fatty acid composition of broiler meat显示文摘We aimed to study the effects of ammonia on carcass traits, organ indices and fatty acid composition of broilers. Four hundred 21-d-old male Arbor Acres broilers with initial weight 563.52 ± 2.82 g were randomly allotted to 1 of 4 groups treated with ammonia at <3 mg/kg(control),25 ± 3. 50 ± 3, and75 ± 3 mg/kg concentrations. Each group consisted of 4 replicates of 25 birds. Broilers from 21 to 42 d were reared on the net floor in the respiration-metabolism chambers where similar environmental conditions were maintained. At 32 and 42 d of age, carcass traits and organ indices were determined for4 birds per pen. At 42 d of age, fatty acid composition in the breast and thigh muscle of broilers was measured. Results showed as follows: 1) At 32 d, the dressing percentage of broilers exposed to 25 and75 mg/kg ammonia were lower than those in the control group(P < 0.05); eviscerated yield percentage of broilers in the 25 mg/kg ammonia group was also lower(P < 0.05). At 42 d, the dressing percentage of broilers in the ammonia treatments and the thigh muscle percentage of broilers in the 50 and 75 mg/kg ammonia groups were lower(P < 0.05) than those in the control. Breast muscle percentage of broilers exposed to 25 and 50 mg/kg ammonia and eviscerated yield percentage exposed to 50 mg/kg ammonia were lower than those in the control(P < 0.05). 2) The kidney index of broilers(d 32) exposed to ammonia was greater(P < 0.05) than that of the control. At 42 d, hepatic index of broilers exposed to ammonia was increased(P < 0.05), and spleen index was decreased(P < 0.05). 3) At 42 d, stearic(C18:0)and saturated fatty acids(SFA) in the thigh muscle of broilers were higher, while the unsaturated fatty acid:saturated fatty acid(U:F) ratio and unsaturated fatty acid(UFA) were lower in the 50 mg/kg ammonia treatment than in the control group(P < 0.05). In conclusion, ammonia over 25 mg/kg could decline carcass traits and immune organ indices and increase the kidney and hepatic indices. Further,exposure to 50 mg/kg ammonia could also decrease breast and thigh muscle yield percentage while increasing SFA content and decreasing UFA content in the thigh muscle of broilers.Huan Xing Sujun Luan Yongbo Sun Renna Sa Hongfu Zhang 2016Animal Nutrition2016,,4:8
18Geological Characteristics and Ore-controlling Factors of the Beiya Gold–Polymetallic Ore Deposit, Northwestern Yunnan Province显示文摘Based on comprehensive petrological, geochronological, and geochemical studies, this study analyzed the relationships between the Beiya gold-polymetallic skarn deposit and quartz syenite porphyries, and discussed the source(s) and evolution of magmas. Our results suggest that syenite porphyries(i.e. the Wandongshan, the Dashadi, and the Hongnitang porphyries), which formed between the Eocene and the early Oligocene epochs, are the sources for the gold-polymetallic ores at the Beiya deposit. Carbonate rocks(T2 b) of the Triassic Beiya Formation in the ore district provide favorable host space for deposit formation. Fold and fault structures collectively play an important role in ore formation. The contact zone between the porphyries and carbonates, the structurally fractured zone of carbonate and clastic rocks, and the zone with well-developed fractures are the ideal locations for ore bodies. Four types of mineralization have been recognized: 1) porphyry-style stockwork gold–iron(copper) ore, 2) skarn-style gold-iron(copper and lead) ore in the near contact zone, 3) strata-bound, lense-type lead–silver–gold ore in the outer contact zone, and 4) distal vein-type gold–lead–silver ore. Supergene processes led to the formation of oxide ore, such as the weathered and accumulated gold–iron ore, the strata-bound fracture oxide ore, and the structure-controlled vein-type ore. Most of these ore deposits are distributed along the axis of the depressed basin, with the hypogene ore controlling the shape and characteristics of the oxide ore. This study provides critical geology understanding for mineral prospecting scenarios.ZHOU Yunman ZHANG Changqing HE Zhonghua LIU Huan ZHOU Guiwu SUN Jia LIU Bo 2018Acta Geologica Sinica(English Edition)2018,92,5:8
19Interaction effect of nitrogen form and planting density on plant growth and nutrient uptake in maize seedlings显示文摘High planting density is essential to increasing maize grain yield.However,single plants suffer from insufficient light under high planting density.Ammonium(NH_4^+)assimilation consumes less energy converted from radiation than nitrateIt is hypothesized that a mixed NO_3~–/NH_4^+supply is more important to improving plant growth and population productivity under high vs.low planting density.Maize plants were grown under hydroponic conditions at two planting densities(low density:only).A significant interaction effect was found between planting density and N form on plant biomass.Compared to nitrate only,75/25NO_3~–/NH_4^+increased per-plant biomass by 44%under low density,but by 81%under high density.Treatment with 75/25NO_3~–/NH_4^+increased plant ATP,photosynthetic rate,and carbon amount per plant by 31,7,and 44%under low density,respectively,but by 51,23,and 95%under high density.Accordingly,carbon level per plant under 75/25NO_3~–/NH_4^+was improved,which increased leaf area,specific leaf weight and total root length,especially for high planting density,increased by 57,17 and 63%,respectively.Furthermore,under low density,75/25NO_3~–/NH_4^+increased nitrogen uptake rate,while under high density,75/25NO_3~–/NH_4^+increased nitrogen,phosphorus,copper and iron uptake rates.By increasing energy use efficiency,an optimum NO_3~–/NH_4^+ratio can improve plant growth and nutrient uptake efficiency,especially under high planting density.In summary,an appropriate supply of NH_4^+in addition to nitrate can greatly improve plant growth and promote population productivity of maize under high planting density,and therefore a mixed N form is recommended for high-yielding maize management in the field.WANG Peng WANG Zhang-kui SUN Xi-chao MU Xiao-huan CHEN Huan CHEN Fan-jun Yuan Li-xing MI Guo-hua 2019Journal of Integrative Agriculture2019,18,5:8
20Semi-quantitative Assessment of Brain Maturation by Conventional Magnetic Resonance Imaging in Neonates with Clinically Mild Hypoxic-ischemic Encephalopathy显示文摘Jie Gao Qin-Li Sun Yu-Miao Zhang Yan-Yan Li Huan Li Xin HOU Bo-Lang Yu Xi-Hui Zhou Jian Yang 2015Chinese Medical Journal2015,,5:7
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