检索结果-南通市图书馆

在线全文

学校读者我要写书评

暂无评论

两种大豆籽粒萌发特性差异的比较转录组分析

中国油料作物学报 2024年第1期46卷 28-35页

作者：严文培孙霞邓莹莹李强吴秀菊东北农业大学生命科学学院黑龙江哈尔滨150030 山东省日照市农业科学研究院山东日照276800

大豆种子的萌发决定着幼苗建成和生长发育进程,快速萌发及高发芽率是大豆生产中获得高产的重要保障。本研究以不同萌发特性的黑农35及其诱变株系M为材料,基于萌发初期种皮微形态观察和主要生理指标检测,拟通过“露白期”(吸水后24 h)转... 详细信息

大豆种子的萌发决定着幼苗建成和生长发育进程,快速萌发及高发芽率是大豆生产中获得高产的重要保障。本研究以不同萌发特性的黑农35及其诱变株系M为材料,基于萌发初期种皮微形态观察和主要生理指标检测,拟通过“露白期”(吸水后24 h)转录组的差异基因分析,进一步明晰大豆种子萌发机理。结果表明,两者的吸水率和发芽率存在显著差异;扫描电镜观察发现,与黑农35相比,M的种脐较长,种皮较薄,这些形态特征可能是萌发初期M吸水更快的主要原因。萌发过程中脱落酸(ABA)含量逐渐下降,可溶性蛋白含量均呈先下降后上升趋势,可溶性糖含量均为上升-下降-上升的“S”形。转录组分析发现两者共有1122个差异基因,其中478个上调,644个下调,差异基因主要富集在光合作用途径,筛选到22个与光合途径相关的候选基因,在M中均呈下调趋势,可能引起光形态建成较慢,进而导致诱变株系M萌发率变低,研究结果可为解析大豆种子萌发的调控机制提供思路。

关键词：大豆种子萌发种皮微形态贮藏物质差异表达基因

Ag/AgX nanostructures serving as antibacterial agents:achievements and challenges

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2022年第2期41卷 519-539页

作者： Pei-Pei li Hai-xia Wu Alideertu Dong College of Chemistry and Chemical Engineering Engineering Research Center of Dairy Quality and Safety Control TechnologyMinistry of EducationInner Mongolia UniversityHohhot 010021China

Bacterial infections,especially the frequently emerging "superbugs",seriously affect the quality of human life and even threaten human *** the emerging antimicrobial agents that effectively eradicate pathogens,nanomaterials have been widely explored due to their effectiveness against wide-spectrum bacteria and“superbugs”.Of them,Ag/AgX nanostructures(X representing Cl,Br or I)have emerged as an excellent antibacterial agent because of their excellent photocatalytic performance in inactivating pathogens under light irradiation,which provides a new opportunity for the development of high-efficient visible-light driven photocatalytic *** date,Ag/AgX nanostructures have been widely employed in antibacterial associated fields because they are efficient in producing reactive oxygen species(ROS)and reactive chlorine species(RCS)under visible light *** this review,we summarized the recent progress of Ag/AgX nanostructures as plasmonic photocatalysts in the antibacterial field,focusing on the antibacterial effects and mechanisms of Ag/AgX nanostructures,as well as their potent ***,the challenges and prospects of Ag/AgX nanostructures acting as active antibacterial agents were discussed.

关键词： Ag/AgX Photocatalytic Antibacterial Nanostructure Nanoengineering

响应面法优化玫瑰花渣不溶性膳食纤维双氧水脱色工艺

在线全文

学校读者我要写书评

暂无评论

中国调味品 2024年第10期49卷 89-93页

作者：陈创业安比芳冯作山乔桂芳刘天志赵永铭陶永霞新疆农业大学食品科学与药学学院乌鲁木齐830052 新疆和田阳光沙漠玫瑰有限公司新疆和田848000

通过酶-化学法提取玫瑰花渣中的膳食纤维,利用双氧水对玫瑰花渣中的不溶性膳食纤维(insoluble dietary fiber, IDF)进行脱色。对双氧水浓度、脱色温度、pH值、脱色时间4个因素进行单因素试验,然后进行响应面试验。响应面试验及验证试验... 详细信息

通过酶-化学法提取玫瑰花渣中的膳食纤维,利用双氧水对玫瑰花渣中的不溶性膳食纤维(insoluble dietary fiber, IDF)进行脱色。对双氧水浓度、脱色温度、pH值、脱色时间4个因素进行单因素试验,然后进行响应面试验。响应面试验及验证试验结果表明,IDF的最佳脱色条件为双氧水浓度(质量分数)11%、pH值10、脱色时间80 min、脱色温度71℃,在此条件下色差值ΔE为51.37。产品颜色为黄绿色,无任何异味,呈细小颗粒状。脱色后IDF性质得到一定程度的提高,持水力为6.857 4 g/g,持油力为1.837 9 g/g,膨胀力为3.17 mL/g。

关键词：玫瑰花渣不溶性膳食纤维(IDF) 脱色双氧水

维普期刊数据库博看期刊

在线全文

学校读者我要写书评

暂无评论

姜花精油的成分分析及抗氧化功效研究

中国调味品 2024年第8期49卷 200-204页

作者：孙丽花李永红张艳华刘曼曼郑州卫生健康职业学院郑州450100 郑州大学药学院郑州450100

姜花是一种传统香料植物,被广泛应用在调味品中,其富含精油,这些精油被应用在制药业和化妆业,具有巨大的商业价值。前人大部分的研究集中于姜花花朵精油,对姜花其他部位精油含量的研究相对较少,导致姜花整体植株利用率偏低。该研究基于... 详细信息

姜花是一种传统香料植物,被广泛应用在调味品中,其富含精油,这些精油被应用在制药业和化妆业,具有巨大的商业价值。前人大部分的研究集中于姜花花朵精油,对姜花其他部位精油含量的研究相对较少,导致姜花整体植株利用率偏低。该研究基于此,采用水蒸气蒸馏法对姜花花朵精油、姜花叶片精油和姜花根茎精油进行提取,并分析不同姜花部位化学成分的差异,同时对比姜花不同部位抗氧化活性的差异。研究结果表明,姜花花朵精油的化学成分种类明显高于姜花叶片精油和姜花根茎精油,3种不同姜花部位的精油DPPH自由基清除率并无明显差异。

关键词：姜花精油抗氧化活性开发利用

维普期刊数据库博看期刊

Methodological progress in trace amounts of structural water in nominally anhydrous minerals

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2016年第5期59卷 901-909页

作者： SHENG YingMing GONG Bing li WanCai xia Mei CAS Key Laboratory of Crust-Mantle Materials and Environments School of Earth and Space Sciences University of Science and Technology of China

In the deep Earth, hydrogen mainly occurs as structural hydroxyl and molecular water in minerals and melts, constituting mobile and immobile aqueous components. Hydrous minerals contain hydrogen which occupies a specific structural position and constitutes an indispensable component of chemical formulae. On the other hand, nominally anhydrous minerals do not contain hydrogen in their chemical formulae, but can host trace amounts of water in structural position and lattice defect. The molecular water may occur in the lattice defect as fluid/melt inclusions in minerals. Even though the water content of nominally anhydrous minerals is very limited generally in the order of ppm(parts per million), they may play a significant role in influencing the physicochemical properties of mineral and rock systems. With the continuous improvement of modern instrumentations, the analytical methodology exhibits trends for higher spatial resolution, lower detection limit and integral multiple methods on the water amount and its isotopic ratio. Among these methods, Fourier transform infrared spectrometry remains the most widely used, while secondary ion mass spectrometry, continuous flow mass spectrometry, elastic recoil detection analysis and Raman spectrometry are promising. This paper provides a brief review on the methodological progress and their applications to the analysis of structural water in nominally anhydrous minerals.

关键词： Nominally anhydrous minerals Water content Structural hydroxyl Molecular water Fourier transform infrared spectrometry

A Water-Heat-Force Coupled Framework for the Preparation of Soils for Application in Frozen Soil Model Test

在线全文

学校读者我要写书评

暂无评论

Fluid Dynamics & Materials Processing 2021年第1期17卷 21-37页

作者： Daoming Shen xia Zhang Jinhong xia Shunqun li College of Civil Engineering and Architecture Xinxiang UniversityXinxiang453000China School of Journalism and Communication Xinxiang UniversityXinxiang453000China College of Civil Engineering and Architecture Tianjin Chengjian UniversityTianjin300384China

The freezing of soil containing a liquid is a complex transient heat conduction problem involving phase change and release or absorption of latent *** efforts have essentially focused on theoretical research and numerical *** the present study,the problem is approached from an experimental point of view using the so-called“freezing model test”*** particular,in order to establish a precise relationship between the model and the prototype,a temperature similarity criterion is derived using the condition of an equal number of *** is also established with respect to other aspects.A similarity criterion for the water field is determined on the basis of relevant partial differential *** criteria for the stress field and load are derived using an elastic *** validity of this approach is experimentally *** research results provide a practical and reasonable method for calculating the parameters for preparing model *** also constitute a theoretical basis and a technical support for the design and implementation of a water-heat-force similarity coupled framework.

关键词： Latent heat frozen soil temperature field water-heat-force coupled framework

Forest soil CO_2 fluxes as a function of understory removal and N-fixing species addition

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

Journal of Environmental Sciences 2011年第6期23卷 949-957页

作者： Haifang li Shenglei Fu Hongting Zhao Hanping xia Institute of Ecology South China Botanical Garden Chinese Academy of Sciences Guangzhou 510650 China College of Tourism Guilin University of Technology Guilin 541004 China E&E Applied Research LLC 3628 Oakwood Drive Longmont Colorado 80503 USA

We report on the effects of forest management practices of understory removal and N-fixing species（Cassia alata） addition on soil CO2 fluxes in an Eucalyptus urophylla plantation（EUp）,Acacia crassicarpa plantation（ACp）,10-species-mixed plantation（Tp）,and 30-species-mixed plantation（THp） using the static chamber method in southern *** forest management treatments,including（1） understory removal（UR）;（2） *** addition（CA）;（3） understory removal and replacement with ***（UR＋CA）;and（4） control without any disturbances（CK）,were applied in the above four forest plantations with three replications for each *** results showed that soil CO2 fluxes rates remained at a high level during the rainy season（from April to September）,followed by a rapid decrease after October reaching a minimum in *** CO2 fluxes were significantly higher（P 〈 0.01） in EUp（132.6 mg/（***）） and ACp（139.8 mg/（***）） than in Tp（94.0 mg/（***）） and THp（102.9 mg/（***））.Soil CO2 fluxes in UR and CA were significantly higher（P 〈 0.01） among the four treatments,with values of 105.7,120.4,133.6 and 112.2 mg/（***） for UR＋CA,UR,CA and CK,*** CO2 fluxes were positively correlated with soil temperature（P 〈 0.01）,soil moisture（P 〈 0.01）,NO3？-N（P 〈 0.05）,and litterfall（P 〈 0.01）,indicating that all these factors might be important controlling variables for soil CO2 *** study sheds some light on our understanding of soil CO2 flux dynamics in forest plantations under various management practices.

关键词： soil C02 fluxes forest management practices understory removal N-fixing species addition forest plantation

Evaluating Breakthrough Pressure in Gas Diffusion Layers of Proton Exchange Membrane Fuel Cells

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2010年第5期19卷 459-464页

作者： Ma Yue Jia li Zhang Zhuqian Wang xia School of Mechanical and Electroriic Control Engineering Beijing Jiaotong University Beijing 100044 China Department of Mechanical Engineering Oakland University Rochester MI 48309 USA

This paper studied the breakthrough pressure for liquid water to penetrate the gas diffusion layer(GDL) of a proton exchange membrane fuel cell(PEMFC).An ex-situ testing was conducted on a transparent test cell to visualize the water droplet formation and detachment on the surface of different types of GDLs through a CCD *** breakthrough pressure,at which the liquid water penetrates the GDL and starts to form a droplet,was *** breakthrough pressure was found to be different for the GDLs with different porosities and *** equilibrium pressure,which is defined as the minimum pressure required maintaining a constant flow through the GDL,was also *** equilibrium pressure was found to be much lower than the breakthrough pressure for the same type of GDL.A pore network model was modified to further study the relationship between the breakthrough pressure and the GDL properties and *** breakthrough pressure increases for the thick GDL with smaller micro-pore size.

关键词： PEMFC Gas diffusion layer Visualization Network model

Reconstruction of electrical capacitance tomography images based on fast linearized alternating direction method of multipliers for two-phase flow system

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2016年第5期24卷 597-605页

作者： Chongkun xia Chengli Su Jiangtao Cao Ping li School of Information and Control Engineering Liaoning Shihua University

Electrical capacitance tomography(ECT)has been applied to two-phase flow measurement in recent *** reconstruction algorithms play an important role in the successful applications of *** solve the ill-posed and nonlinear inverse problem of ECT image reconstruction,a new ECT image reconstruction method based on fast linearized alternating direction method of multipliers(FLADMM)is proposed in this *** the basis of theoretical analysis of compressed sensing(CS),the data acquisition of ECT is regarded as a linear measurement process of permittivity distribution signal of pipe section.A new measurement matrix is designed and L1 regularization method is used to convert ECT inverse problem to a convex relaxation problem which contains prior knowledge.A new fast alternating direction method of multipliers which contained linearized idea is employed to minimize the objective *** data and experimental results indicate that compared with other methods,the quality and speed of reconstructed images are markedly ***,the dynamic experimental results indicate that the proposed algorithm can ful fill the real-time requirement of ECT systems in the application.

关键词： Electrical capacitance tomography Image reconstruction Compressed sensing Alternating direction method of multipliers Two-phase flow