检索结果-南通市图书馆

Inoculation with Pseudomonas spp. Containing ACC-Deaminase Partially Eliminates the Effects of Drought Stress on Growth,Yield,and Ripening of Pea (Pisum sativum L.)

同方学位论文库评论

在线全文

同方学位论文库

学校读者我要写书评

暂无评论

Pedosphere 2008年第5期18卷 611-620页

作者： M. arshad B. SHAHAROONA T. MAHMOOD Institute of Soil & Environmental Sciences University of AgricultureFaisalabad-38040(Pakistan) Department of Agronomy University of Arid AgricultureRawalpindi(Pakistan)

Two preselected plant growth promoting rhizobacteria(PGPR) containing 1-aminocyclopropane-1-carboxylate(ACC) -deaminase(EC 4.***.99.4) were used to investigate their potential to ameliorate the effects of drought stress on growth,yield,and ripening of pea(Pisum sativum L.) . Inoculated and uninoculated(control) seeds of pea cultivar 2000 were sown in pots(four seeds pot-1) and placed in a wire house. The plants were exposed to drought stress at different stages of growth(vegetative,flowering,and pod formation) by skipping the respective irrigation. Results revealed that inoculation of peas with PGPR containing ACC-deaminase significantly decreased the "drought stress imposed effects" on the growth and yield of peas. Exposure of plants to drought stress at vegetative growth stage significantly decreased shoot growth by 41% in the case of uninoculated plants,whereas,by only 18% in the case of inoculated plants compared to nonstressed uninoculated control. Grain yield was decreased when plants were exposed to drought stress at the flowering and pod formation stage,but inoculation resulted in better grain yield(up to 62% and 40% higher,respectively) than the respective uninoculated nonstressed control. Ripening of pods was also delayed in plants inoculated with PGPR,which may imply decreased endogenous ethylene production in inoculated plants. This premise is further supported by the observation that inoculation with PGPR reduced the intensity of classical "triple" response in etiolated pea seedlings,caused by externally applied ACC. It is very probable that the drought stress induced inhibitory effects of ethylene could be partially or completely eliminated by inoculation with PGPR containing ACC-deaminase.

关键词： ACC-脱氨基酶干旱碗豆植物生长成熟

维普期刊数据库

Snowmelt runoff prediction under changing climate in the Himalayan cryosphere: A case of Gilgit River Basin

在线全文

学校读者我要写书评

暂无评论

Geoscience Frontiers 2017年第5期8卷 941-949页

作者： Muhammad Adnan Ghulam Nabi Muhammad Saleem Poomee arshad Ashraf Climate Change Alternate Energy and Water Resources Institute (CAEWRI) National Agricultural Research Center Park Road Chakshahzad Islamabad Pakistan Center of Excellence in Water Resources (CEWR) Lahore Pakistan

There are serious concerns of rise in temperatures over snowy and glacierized Himalayan region that may eventually affect future river flows of Indus river system. It is therefore necessary to predict snow and glacier melt runoff to manage future water resource of Upper Indus Basin(UIB). The snowmelt runoff model(SRM) coupled with MODIS remote sensing data was employed in this study to predict daily discharges of Gilgit River in the Karakoram Range. The SRM was calibrated successfully and then simulation was made over four years i.e. 2007, 2008, 2009 and 2010 achieving coefficient of model efficiency of 0.96, 0.86, 0.9 and 0.94 respectively. The scenarios of precipitation and mean temperature developed from regional climate model PRECIS were used in SRM model to predict future flows of Gilgit River. The increase of 3 C in mean annual temperature by the end of 21 th century may result in increase of 35-40% in Gilgit River flows. The expected increase in the surface runoff from the snow and glacier melt demands better water conservation and management for irrigation and hydel-power generation in the Indus basin in future.

关键词： Snowmelt runoff model Climate change Gilgit River Himalayan region

维普期刊数据库

天然草原综合风险评估与区划研究——基于多重风险相互作用的视角

在线全文

学校读者我要写书评

暂无评论

中国农业资源与区划 2023年第7期44卷 139-149页

作者：郭新雅赵元凤弓宇飞 Muhammad Umer arshad 内蒙古农业大学经济管理学院呼和浩特010018 内蒙古大学鸿德文理学院呼和浩特010000

[目的]在建立健全草原风险管理体系,保障草原生态安全和稳定草原畜牧业生产的背景下,草原保险的作用更加凸显。草原风险评估和区划作为草原保险设计的前提和基础,其准确性直接决定着草原保险条款的合理性及科学性。[方法]文章利用半定... 详细信息

[目的]在建立健全草原风险管理体系,保障草原生态安全和稳定草原畜牧业生产的背景下,草原保险的作用更加凸显。草原风险评估和区划作为草原保险设计的前提和基础,其准确性直接决定着草原保险条款的合理性及科学性。[方法]文章利用半定量化因果关系矩阵法、HP滤波模型、多种聚类分析法和单因素方差分析法。[结果]可将锡林郭勒草原分为低、中、高和极高4个风险区,各风险区间的差异显著,其中,低风险区呈现出致灾因子危险性低、承灾体脆弱性低和防灾减灾能力强的显著特点;中风险区呈现出承灾体暴露性水平高,但致灾因子危险性处于中等水平的显著特点;高风险区呈现出致灾因子危险性高,防灾减灾能力处于中等水平的典型特征;极高风险区呈现出承灾体脆弱性水平高,防灾减灾能力弱的典型特征。[结论]在厘定草原保险费率时,应考虑多种风险间的交互作用,构建合理的草原风险区划图。

关键词：天然草原草原风险风险评估风险区划锡林郭勒草原

维普期刊数据库

Detection of SARS-CoV-2 Eta VOI among international travelers using COVIDSeq-NGS

在线全文

学校读者我要写书评

暂无评论

Asian Pacific Journal of Tropical Medicine 2022年第11期15卷 518-521页

作者： Mati Ur Rehman Rooh Ullah Narmeen arshad Muhammad Ammad Qurat Ul Ain Anam Razzak Muhammad Yousaf Shabana Perween Syed Sajjad Naqvi Tarique N.Hasan Pure Health Laboratory Mafraq HospitalAbu DhabiUnited Arab Emirates Ascencia Business School College de ParisFrance Pure Health Laboratory Mafraq HospitalAbu Dhabi

Rationale:SARS-CoV-2 has been identified as a highly infective and contagious viral infection.The SARS-CoV-2 pandemic has been spread worldwide and affected more than 210 countries.Globally,the fast spread of novel SARS-CoV-2 variants has been mostly attributed to international travel.Patient concerns:We are reporting the genomic evidence of SARSCoV-2 Eta VOI among two international travelers.Both travelers were males from Nigeria aged 24 and 34 years and both were asymptomatic.Diagnosis:The nasopharyngeal swab samples were in both travelers positive by real-time RT-PCR followed by COVIDSeq-NGS.Interventions:Paracetamol 3 times daily for 5 days.Outcomes:Patient recovered completely within 10 days and discharged after 14 days of quarantine duration.Lessons:This report highlights genomic variation of SARSCoV-2 among the travelers.For managing the present health crisis,molecular identification of viral variants present in different geographical locations will be very helpful.

关键词： COVID-19 SARS-CoV-2 Eta VOC VOI

Structural and optical properties of Cr doped ZnO crystalline thin films deposited by reactive electron beam evaporation technique

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2013年第1期23卷 64-69页

作者： Amjid Iqbal arshad Mahmood Taj Muhammad Khan Ejaz Ahmed National Institute of Laser and Optronics(NILOP) P.O.NiloreIslamabad 45650Pakistan Physics Division PINSTECH P.O.NiloreIslamabad 45650Pakistan

ZnO and Cr-doped ZnO thin films are grown on to glass substrates using reactive electron beam(e-beam) evaporation technique.Variation of structural,morphological,and optical properties with Cr doping is investigated.X-ray diffraction(XRD) studies show that the films are polycrystalline in nature with single phase.Energy dispersive spectroscopy(EDS) results demonstrate that Cr ions are substitutionally incorporated into ZnO.Atomic force microscopy(AFM) reveals that the films present a compact surface and root mean squared(RMS) roughness increased with Cr contents.The optical band gap energy Eg of the films has been determined using Transmission data by spectrophotometer and ellipsometry.The band gap energy found to be decreased with increasing Cr doping concentration.The optical constants(refractive index,extinction coefficient) are calculated using ellipsometry and found to increase with Cr doping concentration.

关键词： Cr doping Thin film ZnO thin films Roughness Ellipsometry Optical constants

Magnetic Field-induced Enhancement of Phase Change Heat Transfer via Biomimetic Porous Structure for Solar-thermal Energy Storage

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Bionic Engineering 2021年第5期18卷 1215-1224页

作者： Juan Li Zhangyu Zhu Adeel arshad Shuai Zhang Lei Shi Yuying Yan School of Mechanical and Electrical Engineering Nanjing Forestry UniversityNanjing 210037People's Republic of China Fluids and Thermal Engineering Research Group Faculty of EngineeringUniversity of NottinghamNottingham NG72RDUK School of Energy Science and Engineering Harbin Institute of TechnologyHarbin 150001People's Republic of China

Multifunctional phase change composites are in great demand for all kinds of industrial technologies and applications,which have both superior latent heat capacity and excellent solar-thermal conversion capability.In this research,biomimetic phase change composites are made by inspired by natural systems,successfully getting the high thermal conductivity of carbon foam and magnetism of composites together,to establish a novel solar-thermal energy storage method.The morphology and the thermal characteristics of biomimetic phase change composites have been characterized.The results showed that the maximum storage efficiency of the biomimetic phase change materials increased by 56.3%compared to that of the based materials,and it can further be improved by the application of magnetic field.Meanwhile the heat transfer process of solarthermal conversion and energy storage in biomimetic porous structure under the external physical fields has been explained by simulation.Thus,the magnetic field-induced method applied in this research has better solar-thermal energy storage characteristics within a porous structure by dynamically controlling the magnetism,which has potential uses for various sustainable applications,including waste-heat recovery,energy conservation in building,and solar-thermal energy storage.

关键词： Bionic porous structure Solar-thermal conversion Thermal energy storage Phase change materials Magnetic nanoparticles

Effects of the wall properties on unsteady peristaltic flow of an Eyring-Powell fluid in a three-dimensional rectangular duct

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

生物数学学报：英文版 2015年第6期8卷 185-201页

作者： arshad Riaz S. Nadeem R. Ellahi Department of MathematicsUniversity of Education LahoreJauharabad Campus Pakistan Department of MathematicsQuaid-i-Azam University 45320 Islamabad 44000 Pakistan Department of Mathematics and Statistics FBAS HU Islamabad 44000 Pakistan

In the present investigation, peristaltic flow of non-Newtonian fluid model (Eyring–Powell) has been taken into consideration in a cross-section of three-dimensional rectangular channel. The flow is taken to be unsteady and incompressible. The observations are made under the limitations of low Reynolds number and long wavelength which helps in reducing the governing equations. The walls of the channel are supposed to be compliant. The obtained equations are nonlinear partial differential equation of second order and have been solved analytically by using series solution technique. The achieved results are then portrayed graphically to see the variation of various emerging parameters on the profile of velocity. The stream functions have also been sketched in order to discuss the trapping behavior of the circular bolus.

关键词：流体模型蠕动三维墙壁二阶非线性偏微分方程非定常矩形管性能

Structural and spectroscopic analysis of wurtzite(ZnO)1-x(Sb2O3)x composite semiconductor

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2015年第2期25卷 131-136页

作者： Hafeez ullah Amjid Iqbal M. Zakria arshad Mahmood University of Trento Department of Physics Via Sommarive 14 Povo 38123 Trento Italy Center for Materials and Microsystems Fondazione Bruno Kessler Via Sommarive 18 Povo 38123 Trento Italy 3. National Institute of Lasers and Optronics (NILOP) Nilore Islamabad Pakistan

The structural, vibrational and impedance analysis for(Zn O)1 x(Sb2O3)xcomposite synthesized by solid state reaction technique were carried out in the present investigation. X-ray diffraction(XRD) study showed that(Zn O)1 x(Sb2O3)xcomposite has hexagonal(wurtzite) crystal structure. Variation in lattice constants with Sb-doping indicated the proper incorporation of Sb dopant in Zn O host matrix. The results of Raman spectroscopy test suggested the signature of E2(high) and E1(TO) Raman modes, and verified the wurtzite structure of(Zn O)1 x(Sb2O3)x composite. Two additional phonon bands(671, 712) cm 1appeared in Raman spectra of composite samples due to the existence of the lattice defects caused by Sb doping or may be other intrinsic lattice defects formed during the synthesis of(Zn O)1 x(Sb2O3)xcomposite. The frequency dependent on the electrical characteristics, such as, impedance(Z), dielectric constant(ε) and AC conductivity(σ) have been studied in a range of frequencies for different Sb concentration at room temperature. The electrical measurement results showed that the impedance increased with Sb dopant concentration, while dielectric constant and AC conductivity decreased with Sb dopant concentration.

关键词： (Zn O)1 x(Sb2O3)x Semiconductors XRD Raman spectroscopy Impedance spectroscopy

Telomere-to-telomere haplotype-resolved reference genome reveals subgenome divergence and disease resistance in triploid Cavendish banana

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Horticulture Research 2023年第9期10卷 85-97页

作者： Hui-Run Huang Xin Liu Rida arshad Xu Wang Wei-Ming Li Yongfeng Zhou Xue-Jun Ge Key Laboratory of Plant Resources Conservation and Sustainable Utilization South China Botanical GardenChinese Academy of SciencesGuangzhou 510650China South China National Botanical Garden Guangzhou 510650China University of Chinese Academy of Sciences Beijing 100049China State Key Laboratory of Tropical Crop Breeding Shenzhen BranchGuangdong Laboratory of Lingnan Modern AgricultureKey Laboratory of Synthetic BiologyMinistry of Agriculture and Rural AffairsAgricultural Genomics Institute at ShenzhenChinese Academy of Agricultural SciencesShenzhen 518120China School of Marine Sciences and Biotechnology Guangxi University for NationalitiesNanning 530008China State Key Laboratory of Tropical Crop Breeding Tropical Crops Genetic Resources InstituteChinese Academy of Tropical Agricultural SciencesHaikou 571101China

Banana is one of the most important crops of the world.Cavendish-type bananas,which have a monospecific Musa acuminata origin(AAA),account for around half of the global banana production,thereby are of great significance for human societies.However,until now,the high-quality haplotype-resolved reference genome was still undecoded for banana cultivars.Here,we reported the telomere-to-telomere(T2T)and haplotype-resolved reference genome of‘Baxijiao’(Cavendish)consisting of three haploid assemblies.The sizes of the three haploid assemblies were estimated to be 477.16 Mb,477.18 Mb,and 469.57 Mb,respectively.Although with monospecific origins,the three haploid assemblies showed great differences with low levels of sequence collinearity.Several large reciprocal translocations were identified among chromosomes 1,4,and 7.An expansion of gene families that might affect fruit quality and aroma was detected,such as those belonging to sucrose/disaccharide/oligosaccharide catabolic processes,sucrose metabolic process,starch metabolic process,and aromatic compound biosynthetic process.Besides,an expansion of gene families related to anther and pollen development was observed,which could be associated with parthenocarpy and sterility of the Cavendish cultivar.Finally,much fewer resistance genes were identified in‘Baxijiao’than in M.acuminata,particularly in the gene clusters in chromosomes 3 and 10,providing potential targets to explore for molecular analysis of disease resistance in banana.This T2T haplotype-resolved reference genome will thus be a valuable genetic resource for biological studies,molecular breeding,and genetic improvement of banana.

关键词： cultivar breeding crops