检索结果-南通市图书馆

Influences of Mo on Nitrate Reductase, Glutamine Synthetase and Nitrogen Accumulation and Utilization in Mo-Efficient and Mo-Inefficient Winter Wheat Cultivars

在线全文

学校读者我要写书评

暂无评论

Agricultural Sciences in China 2010年第3期9卷 355-361页

作者： YU Min hu cheng-xiao SUN Xue-cheng WANG Yun-hua Research Center of Trace Elements Huazhong Agricultural University Wuhan 430070 P.R. China Department of Horticulture Foshan University Foshan 528000 P.R. China

The objective is to study whether the accumulation and utilization of plant N are controlled by Mo status in winter wheat cultivars. Mo-efficient cultivar 97003 （eft） and Mo-inefficient cultivar 97014 （ineff） were grown in severely Mo-deficient acidic soil （Tamm-reagent-extractable Mo 0.112 mg kg^-1） with （＋Mo） and without （-Mo） the application of 0.13 mg kg^-1 Mo. The accumulation and use efficiency of plant total N were significantly higher in ＋Mo than that in -Mo and in eft than that in ineff under Mo deficiency. N use efficiency was remarkably higher in maturity but it was forwarded to jointing stage after Mo supply, thus indicating that Mo supply promoted the N use efficiency besides N uptake and eff was efficient in N uptake and utilization. The overall activity of nitrate reductase （NR, EC 1.***.6.1） was significantly higher in ＋Mo than in -Mo and ratio of ＋Mo/-Mo was even to 14.8 at filleting stage for ineff. Activity of glutamine synthetase （GS, EC 6.***.1.2） was significantly lower in ＋Mo than in -Mo. Concentration of nitrate and glutamate were also significantly lower in ＋Mo than in -Mo, thus provided evidences for enhancing N use efficiency by Mo supply. Activities of NR and GS were significantly higher and concentrations of nitrate and glutamate were significantly lower in eff than ineff under Mo deficiency, thus indicated eff was more efficient in N reduction and utilization. It is therefore concluded that Mo could promote N accumulation and utilization in winter wheat which was directly related to NR and feedback regulated by GS. Higher Mo status also results in higher accumulation and utilization of plant N in eft.

关键词： winter wheat Mo N accumulation N use efficiency nitrate reductase glutamine synthetase

Variation in spectral characteristics of dissolved organic matter derived from rape straw of plants grown in Se-amended soil

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2020年第7期19卷 1876-1884页

作者： JIA Wei ZHAO xiao-hu ZHAO Yuan-yuan XU Jia-yang MING Jia-jia CAI Miao-miao hu cheng-xiao College of Resources and Environment/Research Center of Trace Elements Huazhong Agricultural University/Key Laboratory of Arable Land Conservation(Middle and Lower Reaches of Yangtze River)Ministry of Agriculture and Rural AffairsWuhan 430070P.R.China hubei Provincial Engineering Laboratory for New-type Ferilizer Wuhan 430070P.R.China

Straw return is an effective management practice. It not only utilizes agricultural waste but also introduces dissolved organic matter(DOM) into the soil. Selenium(Se) is an essential trace element in the human diet and contributes to the popularity of Se-enriched agricultural products in the Chinese market. Moreover, there are still some Se-enriched agricultural products that have yet to be utilized. This study investigated whether Se addition in soil caused component changes in the DOM extracted from rape straw. DOM extracted from rape straw grown in soil with four Se levels(0, 0.1, 0.5 and 1.0 mg Se kg-1 soil) was characterized by UV-Visible spectroscopy, fluorescence spectroscopy and FTIR spectroscopy. The UVvisible spectra revealed that 0.1 mg Se kg-1 soil reduced the molecular weight of DOM and caused the presence of more irreplaceable aromatic structures in the substituent groups of the DOM, while 0.5 and 1.0 mg Se kg-1 soil only reduced the DOM molecular weight. Fluorescence spectroscopy indicated that Se improved the humification degree but reduced the aromaticity of DOM. FTIR spectra proved that Se altered the contents of carboxylic acids, amino acids, alcohols and aromatic heterocycles in DOM, which were maximized in the 0.5 and 1.0 mg Se kg-1 treatment groups. We concluded that Se application could change the composition of DOM extracted from rape straw, potentially impacting the nutrient bioavailability in soil. This study provides basic data on Se-enriched rape straw utilization for eco-agriculture.

关键词： composition dissolved organic matter rape straw selenium spectroscopy

Effects of Molybdenum on the Intermediates of Chlorophyll Biosynthesis in Winter Wheat Cultivars Under Low Temperature

在线全文

学校读者我要写书评

暂无评论

Agricultural Sciences in China 2006年第9期5卷 670-677页

作者： YU Min hu cheng-xiao WANG Yun-hua Research Center of Trace Elements Huazhong Agricultural University Wuhan 430070 P.R.China Department of Horticulture Foshan University Foshan 528000 P.R.China

The objective was to probe the site where the biosynthesis of chlorophyll was blocked under Mo deficiency at low temperature, which led to the decrease of chlorophyll in winter wheat cultivars. The intermediates of chlorophyll biosynthesis were analyzed in winter wheat cultivars in soil culture, miniblock culture, and solution culture to study the effects of Mo on chlorophyll biosynthesis without Mo addition （CK, soil available Mo 0.112 mg kg^-1） and Mo addition （＋ Mo, 0.13 mg kg^-1 Mo was added）. Laevulinic acid （LA）, the competitive analog of δ-aminolaevulinic acid （ALA） was also introduced in the experiment. The ratio of Chl a/Chl b was constant between CK and ＋ Mo treatment, whereas it increased at low temperature, which indicated that Mo deficiency did not inhibit the transformation of Chl a to Chl b at low temperature. Under Mo deficiency, the contents of protochlorophyll （Pchl）, Mg-protoporphyrin Ⅸ （Mg-Proto Ⅸ）, protoporphyrin Ⅸ （proto IX）, and uroporphyrinogen Ⅲ （Uro Ⅲ） decreased [Uro Ⅲ decreased significantly （P 〈0.01）], whereas ALA and glutamate increased significantly （P 〈 0.01） compared with that of Mo addition, which suggested that the transformation from ALA to Uro Ⅲ might be inhibited. The content of ALA reversed after addition of LA, it was significantly higher （P 〈 0.01） in Mo addition than in CK. The results indicated that the transformation from ALA to Uro Ⅲ was blocked under Mo deficiency, which resulted in the inhibition of the biosynthesis of chlorophyll and led to the decrease of chlorophyll in winter wheat cultivars.

关键词： chlorophyll δ-aminolaevulinic acid uroporphyrinogen Ⅲ glutamate laevulinic acid winter wheat cultivars

在线全文

学校读者我要写书评

暂无评论

古代昭君题材的历史流变

求是学刊 2006年第2期33卷 115-120页

作者：胡小成海南师范学院中文系海南海口571158

汉乐府《昭君怨》到《后汉书.南匈奴传》的一系列作品从各个角度逐渐完善了昭君的故事,并形成“昭君怨”的基调,奠定了昭君题材的文学母题;从南北朝到唐宋,文人们从不同角度和层面进行阐释和创作,扩充和发展了“昭君怨”这一母题的内涵... 详细信息

汉乐府《昭君怨》到《后汉书.南匈奴传》的一系列作品从各个角度逐渐完善了昭君的故事,并形成“昭君怨”的基调,奠定了昭君题材的文学母题;从南北朝到唐宋,文人们从不同角度和层面进行阐释和创作,扩充和发展了“昭君怨”这一母题的内涵;元代的马致远则创造性地接受了前代的影响,创作出杂剧《汉宫秋》,奇妙地兼容和深化了昭君题材的丰富意蕴,成为经典原型之作,深刻影响着后世的创作。

关键词：昭君出塞文学母题经典原型历史流变

Laparoscopic liver resection utilizing the ventral avascular area of the inferior vena cava:A retrospective cohort study

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2025年第1期31卷 42-57页

作者： Kun huang Zhu Chen Heng xiao Hai-Yang hu Xing-Yu Chen cheng-You Du Xiang Lan Department of Hepatobiliary Surgery The First Affiliated Hospital of Chongqing Medical UniversityChongqing 400000China Department of General Surgery Mianyang Hospital of Traditional Chinese MedicineMianyang 621000Sichuan ProvinceChina

BACKGROUND Laparoscopic liver resection(LLR)can be challenging due to the difficulty of establishing a retrohepatic tunnel under *** the third hepatic hilum before parenchymal transection often leads to significant liver mobilization,tumor compression,and bleeding from the short hepatic veins(SHVs).This study introduces a novel technique utilizing the ventral avascular area of the inferior vena cava(IVC),allowing SHVs to be addressed after parenchymal transection,thereby reducing surgical complexity and improving outcomes in in situ *** To introduce and evaluate a novel LLR technique using the ventral avascular area of the IVC and compare its short-term outcomes with conventional *** The clinical cohort data of patients with pathologically confirmed hepatocellular carcinoma or intrahepatic cholangiocarcinoma who underwent conventional LLR and novel LLR between July 2021 and July 2023 at the First Affiliated Hospital of Chongqing Medical University were retrospectively *** novel LLR,we initially separated the caudate lobe from the IVC using dissecting forceps along the ventral avascular area of the ***,we transected the parenchyma of the left and right caudate lobes from the caudal side to the cephalic side using the avascular area as a ***,we addressed the SHVs and finally dissected the root of the right hepatic vein or left hepatic *** short-term postoperative outcomes and oncological results of the two approaches were evaluated and *** A total of 256 patients were included,with 150(58.59%)undergoing conventional LLR and 106(41.41%)undergoing novel *** novel technique resulted in significantly larger tumor resections(6.47±2.96 cm vs 4.01±2.33 cm,P<0.001),shorter operative times(199.57±60.37 minutes vs 262.33±83.90 minutes,P<0.001),less intraoperative blood loss(206.92±37.09 mL vs 363.34±131.27 mL,P<0.001),and greater resection volume(345.11±31.40 mL vs 264.38±31.98 mL,P<0.001)comp

关键词： Laparoscopic liver resection Inferior vena cava Retrohepatic tunnel Short hepatic veins Complex liver tumors Intraoperative bleeding control

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

污水氮浓度对粉绿狐尾藻去氮能力的影响

环境科学 2017年第3期38卷 1093-1101页

作者：马永飞杨小珍赵小虎胡承孝谭启玲孙学成吴金水华中农业大学资源与环境学院武汉430070 新型肥料湖北省工程实验室武汉430070 中国科学院亚热带农业生态研究所长沙410000

粉绿狐尾藻是构建人工湿地的重要植物,对污水具有较强的净化作用,但有关其去氮能力及其与污水氮浓度的关系尚不清楚.本试验采用人工模拟盆栽试验,设2、5、10、20、100、200、400 mg·L^(-1)共7个氮水平,研究污水氮浓度对粉绿狐尾藻去氮... 详细信息

粉绿狐尾藻是构建人工湿地的重要植物,对污水具有较强的净化作用,但有关其去氮能力及其与污水氮浓度的关系尚不清楚.本试验采用人工模拟盆栽试验,设2、5、10、20、100、200、400 mg·L^(-1)共7个氮水平,研究污水氮浓度对粉绿狐尾藻去氮能力的影响.结果表明,氮浓度不高于20 mg·L^(-1)时,前3周粉绿狐尾藻以20 mg·L^(-1)生长最好,处理1周水体总氮和氨氮的去除率接近100%,而硝态氮浓度低、变化不大;粉绿狐尾藻氮含量因氮浓度变化不大但部位间有"上高下低"趋势,且粉绿狐尾藻还利用了底泥氮.氮浓度100~400 mg·L^(-1)时,4~5周以氮浓度200 mg·L^(-1)粉绿狐尾藻生长最好;处理5周总氮去除率依次为76.5%、71.5%和48.1%,氨氮去除率依次为99.6%、99.3%和60.2%;各处理硝态氮去除率约为50%且处理间差异不大;粉绿狐尾藻氮含量随氮浓度而升高,但部位间差异小、呈均匀分布;粉绿狐尾藻积累氮、底泥固定氮分别占水体去除氮的27.9%~48.4%和12.2%~24.4%.因此,粉绿狐尾藻去氮能力受污水氮浓度的显著影响,去除氨氮率显著高于硝态氮;氮浓度还影响粉绿狐尾藻对氮的吸收积累和分配机制,值得深入研究.

关键词：粉绿狐尾藻污水氨氮硝态氮氮去除率

污水氮浓度和NH4^＋/NO3^-比对粉绿狐尾藻去氮能力和植物体氮组分的影响

在线全文

学校读者我要写书评

暂无评论

环境科学 2018年第3期39卷 1167-1179页

作者：马永飞杨小珍赵小虎胡承孝谭启玲孙学成吴金水华中农业大学资源与环境学院新型肥料湖北省工程实验室武汉430070 中国科学院亚热带农业生态研究所长沙410000

采用溶液培养法,设置3个氮浓度20、100、200 mg·L-1和3个NH_4^+/NO_3^-比1∶0、0.5∶0.5、0∶1,研究污水氮浓度和NH_4^+/NO_3^-比对粉绿狐尾藻去氮能力和植物体氮组分的影响.结果表明,粉绿狐尾藻的生物量在第1周增长最快,其中氮浓度20... 详细信息

采用溶液培养法,设置3个氮浓度20、100、200 mg·L-1和3个NH_4^+/NO_3^-比1∶0、0.5∶0.5、0∶1,研究污水氮浓度和NH_4^+/NO_3^-比对粉绿狐尾藻去氮能力和植物体氮组分的影响.结果表明,粉绿狐尾藻的生物量在第1周增长最快,其中氮浓度20 mg·L-1、100 mg·L-1时,生物量以NH_4^+/NO_3^-=1∶0处理最大;氮浓度200 mg·L-1时,以NH_4^+/NO_3^-=0.5∶0.5处理最大.粉绿狐尾藻在第1周对总氮、铵态氮和硝态氮去除速率最高,且随氮浓度升高而增加;氮浓度20 mg·L-1时,铵态氮和硝态氮的去除率无显著差异,氮浓度100 mg·L-1、200 mg·L-1时硝态氮的去除率高于铵态氮.粉绿狐尾藻氮积累量及对水体和底泥氮去除的贡献率均随氮浓度升高而增加,其氮含量和积累量均以第1周增长最快,氮浓度20 mg·L-1时氮积累贡献率以NH_4^+/NO_3^-=0∶1最大,氮浓度100 mg·L-1、200 mg·L-1时以NH_4^+/NO_3^-=0.5∶0.5最大.粉绿狐尾藻体内蛋白质、氨基态氮和硝态氮的含量均随氮浓度的升高而增加,且蛋白质>氨基态氮>硝态氮;NH_4^+/NO_3^-为1∶0和0.5∶0.5时蛋白质含量较高,NH_4^+/NO_3^-=1∶0时氨基态氮含量最高,NH_4^+/NO_3^-=0∶1时硝态氮含量最高.由此说明,在试验范围内,粉绿狐尾藻的去氮能力随污水氮浓度升高而提高,可以用于高氮浓度污水修复;粉绿狐尾藻喜铵态氮,但在100 mg·L-1以上的高氮浓度下以硝铵等比时生长和去除氮能力最强;粉绿狐尾藻体内氮组分受硝铵比调节,蛋白氮比例最高,铵态氮和硝态氮则分别随污水NH+4和NO-3比升高而提高.

关键词：粉绿狐尾藻污水氮浓度 NH4^+/NO3^- 氮积累氮组分

Electrochemical conversion of methane to bridge the gap in the artificial carbon cycle

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2025年第1期100卷 286-308页

作者： Yuhao Peng Yuefeng Song Ihar Razanau Juanxiu xiao Wei xiao Di hu Guoxiong Wang College of Chemistry and Molecular Sciences Hubei Key Laboratory of Electrochemical Power Sources Wuhan University State Key Laboratory of Catalysis Dalian National Laboratory for Clean Energy iChEM (Collaborative Innovation Center of Chemistry for Energy Materials) Dalian Institute of Chemical Physics Chinese Academy of Sciences Laboratory of Physical-Chemical Technologies SSPA Scientific and Practical Materials Research Centre of NAS of Belarus State Key Laboratory of Marine Resources Utilization in South China Sea Collaborative Innovation Center of Marine Science and Technology School of Marine Science and Engineering Hainan University Department of Chemical and Environmental Engineering University of Nottingham Ningbo China

Methane, an abundant one-carbon（C1） resource, is extensively used in the industrial production of vital fuels and value-added chemicals. However, current industrial methane conversion technologies are energy-and carbon-intensive, mainly due to the high activation energy required to break the inert C–H bond, low selectivity, and problematic side reactions, including CO2emissions and coke deposition. Electrochemical conversion of methane（ECM） using intermittent renewable energy offers an attractive solution, due to its modular reactor design and operational flexibility across a broad spectrum of temperatures and pressures. This review emphasizes conversion pathways of methane in various reaction systems, highlighting the significance and advantages of ECM in facilitating a sustainable artificial carbon cycle. This work provides a comprehensive overview of conventional methane activation mechanisms and delineates the complete pathways of methane conversion in electrolysis contexts. Based on surface/interface chemistry, this work systematically analyzes proposed reaction pathways and corresponding strategies to enhance ECM efficiency towards various target products, including syngas, hydrocarbons, oxygenates, and advanced carbon materials. The discussion also encompasses opportunities and challenges for the ECM process, including insights into ECM pathways, rational electrocatalyst design, establishment of benchmarking protocols, electrolyte engineering, enhancement of CH4conversion rates, and minimization of CO2emission.

关键词： Methane Electrochemical conversion Reaction mechanism Catalyst design Electrode Electrocatalysis

常见基质对暴雨径流中磷素去除效果的比较研究

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

环境科学 2007年第10期28卷 2280-2286页

作者：单保庆陈庆锋尹澄清胡承孝中国科学院生态环境研究中心北京100085 华中农业大学资源与环境学院武汉430070

选取沙子、土壤、沸石、白矾石、陶粒、钢渣、石灰石、蛭石和碎石9种常见的基质,通过吸附和解吸实验、静态吸附实验和动态模拟实验,较为系统地研究了这些基质的吸附特性以及去除暴雨径流中低浓度磷素污染物的特性,并分析了影响基质去除... 详细信息

选取沙子、土壤、沸石、白矾石、陶粒、钢渣、石灰石、蛭石和碎石9种常见的基质,通过吸附和解吸实验、静态吸附实验和动态模拟实验,较为系统地研究了这些基质的吸附特性以及去除暴雨径流中低浓度磷素污染物的特性,并分析了影响基质去除磷素的影响因子.结果表明,9种供试基质对磷酸盐的动态去除效率要比其他形态磷高,对磷素的平衡吸附量大小顺序为：沸石、土壤、蛭石＞陶粒、钢渣、石灰石＞碎石、沙子、白矾石,对磷素的动态吸附能力为：沸石、石灰石、白矾石、土壤＞钢渣、碎石、沙子＞陶粒、蛭石.另外,蛭石、陶粒和钢渣在对暴雨径流中磷素的静态和动态吸附过程中出现了磷释放现象,其它基质对磷酸盐的动态吸附能力较强,去除率介于30%～87%.综合分析以上多种因素,为了去除暴雨径流中的低浓度磷素,沸石、石灰石和土壤是比较理想的工程基质材料.

关键词：基质暴雨径流磷素吸附