检索结果-南通市图书馆

Effect of Nitrogen Starvation on the Responses of Two Rice Cultivars to Nitrate Uptake and Utilization

在线全文

学校读者我要写书评

暂无评论

Pedosphere 2014年第5期24卷 690-698页

作者： YIN xiao-Ming LUO Wei WANG Song-Wei SHEN Qi-Rong long xiao-hua College of Resources and Environmental Sciences Nanjing Agricultural University

Ammonium(NH+4) is the main nitrogen(N) form for rice crops, while NH+4near the root surface can be oxidized to nitrate(NO-3)by NH+4-oxidizing bacteria. Nitrate can be accumulated within rice tissues and reused when N supply is insufficient. We compared the remobilization of NO-3stored in the tissue and vacuolar between two rice(Oryza sativa L.) cultivars, Yangdao 6(YD6, indica)with a high N use efficiency(NUE) and Wuyujing 3(WYJ3, japonica) with a low NUE and measured the uptake of NO-3, expression of nitrate reductase(NR), NO-3transporter genes(NRTs), and NR activity after 4 d of N starvation following 7-d cultivation in a solution containing 2.86 mmol L-1NO-3. The results showed that both tissue NO-3concentration and vacuolar NO-3activity were higher in YD6 than WYJ3 under N starvation. YD6 showed a 2- to 3-fold higher expression of OsNRT2.1 in roots on the 1st and 4th day of N starvation and had significantly higher values of NO-3uptake(maximum uptake velocity, Vmax) than the cultivar ***, YD6 had significantly higher leaf and root maximum NR activity(NRAmax) and actual NR activity(NRAact) as well as stronger root expression of the two NR genes after the 1st day of N starvation. There were no significant differences in NRAmax and NRAact between the two rice cultivars on the 4th day of N starvation. The results suggested that YD6 had stronger NRA under N starvation, which might result in better NO-3re-utilization from the vacuole, and higher capacity for NO-3uptake and use, potentially explaining the higher NUE of YD6 compared with WYJ3.

关键词： nitrate reductase activity nitrate transpoters nitrogen use efficiency Oryza sativa L. remobilization

Effect of Seawater Stress on Physiological and Biochemical Responses of Five Jerusalem Artichoke Ecotypes

在线全文

学校读者我要写书评

暂无评论

Pedosphere 2009年第2期19卷 208-216页

作者： long xiao-hua CHI Jin-He LIU Ling LI Qing LIU Zhao-Pu College of Resources and Environmental Sciences Nanjing Agricultural University Nanjing 210095 China

Three treatments consisting of 0%,15%,and 30%seawater were investigated to analyse the ecotypic variabilities among five populations of Jerusalem artichoke(Helianthus tuberosus)regarding their responses to seawater stress under a hydroponic culture *** were done 2,4,and 6 days after *** 15%and 30%seawater treatments reduced the growth rates of roots and shoots of *** *** activities of superoxide dismutase, peroxidase,and catalase majored in the leaves were stimulated under the seawater *** electrolyte leakage and malondialdehyde contents of the leaves were also stimulated owing to seawater *** contents of proline and soluble- sugars in the leaves increased significantly with increasing seawater *** concentrations of Na+,K+,and Cl-in the aerial parts and roots increased with an increase in the seawater concentration throughout the experimental *** were ecotypic differences among the five populations of *** as evidenced by the analyses of the above items in both aerial parts and roots under seawater *** magnitude of the ecotypic variance components indicated that a substantial proportion of the total variation for these physiological and biochemical responses were owing to ecotype,indicating the possibility of improvement through hybridization and selection.

关键词： antioxidative enzyme Helianthus tuberosus inorganic and organic solutes seawater stress

Response of Two Jerusalem Artichoke (Helianthus tuberosus)Cultivars Differing in Tolerance to Salt Treatment

在线全文

学校读者我要写书评

暂无评论

Pedosphere 2010年第4期20卷 515-524页

作者： long xiao-hua huaNG Zeng-Rong huaNG Yu-Ling KANG Jian ZHANG Zhen-hua LIU Zhao-Pu College of Resources and Environmental Sciences Nanjing Agricultural University Nanjing 210095 （China） Soil Science and Plant Nutrition School of Earth and Environment The University of Western Australia 35 StirlingHighway Crawley WA 6009 （Australia）

To explore genetic variability for two Jerusalem artichoke cultivated with 75% seawater irrigation for six years） and N7 （Helianthus tuberosus） cultivars, N1 （the sixth-generation （a general variety）, a experiment was conducted to study the changes in physiological attributes under different concentrations （0%, 10% and 25% of seawater concentration in greenhouse and 0%, 30% and 50% of seawater concentration in the field） of seawater salinity stress. In the greenhouse experiment, decreases of dry growth rate, but increases of dry matter percentage and membrane injury occurred in both the genotypes at 10% and 25% seawater treatments, although lesser cell membrane damage was observed in N1 than N7. N1 accumulated greater contents of Na^＋, Cl^-, soluble sugar and proline in leaves compared with NT. In the field experiment, the yields of shoot, root and tuber, and the contents of total-sugar and inulin in tubers of N1 were higher than those of N7. Lesser degree of salt injury in N1 indicated that the relatively salt-tolerant cultivar had higher K^＋/Na^＋ ratio, lower Na^＋/Ca^2＋ ratio, and the salt-induced enhancement of osmotic adjustment.

关键词： cell membrane stability genetic variabilities inorganic ions malondialdehyde seawater salinity stress

Cadmium Accumulation and Translocation in Two Jerusalem Artichoke(Helianthus tuberosus L.) Cultivars

在线全文

学校读者我要写书评

暂无评论

Pedosphere 2011年第5期21卷 573-580页

作者： CHEN Liang long xiao-hua ZHANG Zhen-hua ZHENG xiao-Tao Z. RENGEL LIU Zhao-Pu Jiangsu Provincial Key Laboratory of Marine Biology College of Resources and Environmental Sciences Nanjing Agricultural University Nanjing 210095 (China) Soil Science and Plant Nutrition School of Earth and Environment the University of Western Australia 35 Stirling Highway Crawley WA 6009 (Australia)

Jerusalem artichoke(Helianthus tuberosus L.) not just can be used for bioethanol production but may be potentially used in phytoremediation for the removal of heavy metal *** Jerusalem artichoke cultivars,N2 and N5,were subjected to six cadmium(Cd) concentrations(0,5,25,50,100 and 200 mg L1) to investigate Cd tolerance and *** 21 days of growth,the effects of Cd on growth,chlorophyll content,net photosynthetic rate,intercellular CO2 concentration and malondialdehyde content were *** growth parameters were reduced under Cd *** two Jerusalem artichoke cultivars had relatively high Cd tolerance and accumulation capacity(> 100 mg kg1),with N5 being more tolerant and having higher Cd accumulation than *** accumulated more Cd than stems and *** bioconcentration factors(far higher than 1) and translocation factors(lower than 1) decreased with an increase in Cd *** results suggested that Jerusalem artichoke could be grown at relatively high Cd loads,and N5 could be an excellent candidate for phytoremediation of Cd-contaminated soils.

关键词： bioconcentration factor Cd-contaminated soils heavy metal phytoremediation tolerance index

Duodenal pseudolymphoma: A case report and review of literature

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2011年第27期17卷 3267-3270页

作者： Yong-Heng huang, Tian-Zhu long, Zhi-Yu xiao, hua Ye, Yun-Le Wan, Jie Wang Yong-Heng huang, Tian-Zhu long, Zhi-Yu xiao, hua Ye, Yun-Le Wan, Jie Wang, Department of Hepatobiliary Surgery, Sun Yat-sen Memorial Hospital, Sun Yat-sen University Haizhu District, Guangzhou 510260, Guangdong Province, China Department of Hepatobiliary Surgery Sun Yat-sen Memorial Hospital Sun Yat-sen University Haizhu District Guangzhou 510260 Guangdong Province China.

We report a rare case of duodenal pseudolymphoma without any symptoms. The lesion located in front of the head of the pancreas was found accidentally during a medical examination. The findings of computed tomography and positron emission tomography-computed tomography suggested a stromal tumor or malignant lymphoma. Surgical resection was performed. The lesions were patho- logically diagnosed as duodenal pseudolymphoma.

关键词： Pseudolymphoma Duodenum

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

中国省级卫生总费用快速推算方法与应用研究

中国卫生经济 2012年第5期31卷 14-19页

作者：肖龙华雷海潮北京协和医学院(中国医学科学院)卫生政策与管理研究中心北京100020 北京市卫生局北京100053

目的：建立中国省级卫生总费用快速推算方法,有效缩短总费用报告滞后时间;推算出全国31个省份卫生总费用数据,弥补信息缺失。方法：利用部分推算总体的技术思路,分析卫生部门医疗机构医药费用与卫生总费用的数量关系,采用聚类分析和按... 详细信息

目的：建立中国省级卫生总费用快速推算方法,有效缩短总费用报告滞后时间;推算出全国31个省份卫生总费用数据,弥补信息缺失。方法：利用部分推算总体的技术思路,分析卫生部门医疗机构医药费用与卫生总费用的数量关系,采用聚类分析和按比例推算的办法,建立各省卫生总费用推算方法。结果：首次获得了全国31个省份的卫生总费用数据,2010年省级卫生总费用占国内生产总值的比值在2.97%到7.17%之间,人均卫生总费用在907~4 147元之间,省际差异较大。结论：所建立的省级卫生总费用推算方法有效可行,所得的31个省份卫生总费用数据可用于政策分析。

关键词：卫生总费用快速推算方法聚类分析

不同供镁水平对两菊芋品种幼苗生物量、光合和叶绿素荧光特性的影响

在线全文

学校读者我要写书评

暂无评论

生态学杂志 2012年第4期31卷 823-829页

作者：孙晓娥刘兆普隆小华南京农业大学资源与环境科学学院江苏省海洋生物学重点实验室南京210095

采用砂培方式研究了不同供镁水平对"南芋1号(Nanyu No.1)"和"青芋2号(Qingyu No.2)"幼苗生物量、光合特性和叶绿素荧光特性的影响。结果表明:缺镁使菊芋叶片叶绿素含量显著降低,干物质积累减少,净光合速率、蒸腾速率和光合电子传递速率... 详细信息

采用砂培方式研究了不同供镁水平对"南芋1号(Nanyu No.1)"和"青芋2号(Qingyu No.2)"幼苗生物量、光合特性和叶绿素荧光特性的影响。结果表明:缺镁使菊芋叶片叶绿素含量显著降低,干物质积累减少,净光合速率、蒸腾速率和光合电子传递速率显著下降、CO2同化受抑制,同时Fv/Fm、ΦPSII、qP和qN也显著下降,加重了叶片受到光抑制的程度;随着供镁水平的增加,菊芋的干物质积累,叶绿素含量,光合参数和各系列荧光参数均呈现先增加后降低的趋势;南芋1号和青芋2号在镁离子浓度分别为3和6mmol.L-1,叶片的净光合速率、Fo、Fm、Fo'、Fm'、Fv/Fm、ΦPSII、ETR达到最高值,叶绿素a、b及总叶绿素含量也最多,干物质积累量最大;南芋1号的各系列荧光参数、光合参数、叶绿素含量和干物质积累量均显著高于青芋2号。

关键词：镁菊芋荧光参数能量耗散

在线全文

学校读者我要写书评

暂无评论

不同品种菊芋对海水处理响应的生理指标筛选

水土保持学报 2006年第6期20卷 179-182,186页

作者：隆小华刘兆普南京农业大学资源与环境科学学院南京210095

试验采用温室水培试验的方法,系统评价了7个典型品种菊芋对0,15%,30%海水的响应,并对不同品种菊芋对海水处理响应的生理指标进行了筛选。结果表明:在15%和30%海水处理下地上部和根鲜重、干重、含水率较对照降低,30%海水处理下更显著,而... 详细信息

试验采用温室水培试验的方法,系统评价了7个典型品种菊芋对0,15%,30%海水的响应,并对不同品种菊芋对海水处理响应的生理指标进行了筛选。结果表明:在15%和30%海水处理下地上部和根鲜重、干重、含水率较对照降低,30%海水处理下更显著,而地上部和根N a+和C l-含量随海水浓度增加显著增加,在15%和30%海水处理下菊芋幼苗地上部和根K+含量均高于对照处理。菊芋幼苗地上部和根鲜重和干重与根部N a+含量呈极显著负相关,地上部和根鲜重与地上部和根部C l-含量呈显著负相关,地上部和根干重与地上部和根部K+含量呈显著正相关。根据菊芋在海水处理下的表现分为3种类型:高度耐海水型、中度耐海水型和低度耐海水型。在评价不同基因型菊芋对海水的响应时,地上部和根鲜重、干重及含水率的下降幅度和N a+、K+和C l-含量可作为主要的生理指标。

关键词：菊芋品种海水处理生理指标

舒心通脉片改善异丙肾上腺素介导的心肌缺血的机制

在线全文

学校读者我要写书评

暂无评论

中国医院药学杂志 2015年第4期35卷 311-314页

作者：龙小华李湘平长沙市第四医院湖南长沙410006 中南大学湘雅医院湖南长沙410008

目的:探讨舒心通脉片改善异丙肾上腺素介导的心肌缺血的作用机制与其抑制含Nox4的NADPH氧化酶介导的氧化应激。方法:研究舒心通脉片对异丙肾上腺素诱导的心肌缺血大鼠心电图和左心室Nox4表达水平的影响,以及大鼠给药后血清中乳酸脱氢酶(... 详细信息

目的:探讨舒心通脉片改善异丙肾上腺素介导的心肌缺血的作用机制与其抑制含Nox4的NADPH氧化酶介导的氧化应激。方法:研究舒心通脉片对异丙肾上腺素诱导的心肌缺血大鼠心电图和左心室Nox4表达水平的影响,以及大鼠给药后血清中乳酸脱氢酶(lactate dehydrogenase,LDH)、磷酸肌酸激酶(creatine phosphokinase,CK)、超氧化物歧化酶(superoxide dismutase,SOD)和丙二醛(malondialdehyde,MDA)浓度的变化。结果:舒心通脉片可抑制异丙肾上腺素介导的心肌缺血大鼠中ST段位移值的增加,降低血清中LDH和CK水平,升高SOD活性,降低左心室中Nox4的表达水平。结论:舒心通脉片可改善异丙肾上腺素诱导的心肌缺血,其机制可能与降低Nox4介导的活性氧的产生和升高SOD活性有关。

关键词：舒心通脉片心肌缺血 Nox4 氧化应激