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178篇 您的检索式:作者名="D. Kumar"
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1Efficacy of Bacillus subtilis MBI 600 Against Sheath Blight Caused by Rhizoctonia solani and on Growth and Yield of Rice显示文摘Rice sheath blight disease(ShB),caused by Rhizoctonia solani,gives rise to significant grain yield losses.The present study evaluated the efficacy of Integral?,the commercial liquid formulation of Bacillus subtilis strain MBI 600,against rice ShB and for plant growth promotion.In greenhouse studies,four log concentrations of Integral(from 2.2×106 to 2.2×109 cfu/mL) were used as seed treatment(ST).After 25 d,seedlings were dipped(SD) into Integral prior to transplanting.At 30 d after transplanting(DAT),leaf sheaths were inoculated with immature sclerotia of the pathogen.At 45 DAT,a foliar spray(FS) with Integral was applied to some treatments.The fungicide control was 50% carbendazim at 1.0 g/L,and a nontreated control was also included.Overall,there were 10 treatments,each with five replications.ShB severity was rated at 52 DAT,and seedling height and number of tillers per plant were rated at 60 DAT.In 2009,two field trials evaluated Integral at 2.2×108 and 2.2×109 cfu/mL.Integral was applied as ST,and seedlings were produced in a nursery bed.After 32 d,seedlings were treated with Integral as SD and transplanted into 10 m2 blocks.Foliar sprays were given at 45 and 60 DAT.There were seven treatments,each with eight replications arranged as a factorial randomized complete block design.At 20 DAT,the plots were broadcast inoculated with R.solani produced on rice grains.Seedling height before transplanting,ShB severity at 90 DAT,and grain yield at harvest were recorded.Integral at 2.2×109 cfu/mL provided significant increase of seedling heights over other treatments under greenhouse conditions.The Integral treatments of ST + SD + FS at 2.2×109 cfu/mL significantly suppressed ShB over other treatments.In field studies,Integral provided significant increase of seedling height in nursery,and number of tillers per plant,compared with the control.ShB severity was significantly suppressed with higher concentrations of Integral compared to lower concentrations.Grain yield were the highest at an Integral concentration of 2.2×109 cfu/mL.Overall,Integral significantly reduced ShB severity,enhanced seedling growth,number of tillers per plant and grain yield as ST + SD + FS at the concentration of 2.2×109 cfu/mL under the conditions evaluated.K. VIJAY KRISHNA KUMAR S. KR. YELLAREDDYGARI M. S. REDDY J. W. KLOEPPER K. S. LAWRENCE X. G. ZHOU H. SUDINI D. E. GROTH S. KRISHNAM RAJU M. E. MILLER 2012Rice science2012,19,1:11
2Effect of Post Heat Treatment on Corrosion Resistance of Phytic Acid Conversion Coated Magnesium显示文摘An environment friendly chemical conversion coating for magnesium was obtained by using a phytic acid solution. The effect of post-coating 1heat treatment on the microstructures and corrosion properties of phytic acid conversion coated magnesium was investigated. It was observed that the microstructure and corrosion resistive properties were improved for the heat treated samples. The corrosion current density for bare magnesium, phytic acid conversion coated magnesium, and post-coating heat treated magnesium was calculated to be 2.48×105 , 1.18×106 , and 9.27×107 A/cm2 , respectively. The lowest corrosion current density for the heat treated sample indicated its highest corrosion resistive effect for the magnesium. The maximum corrosion protective nature of the heat treated sample was further confirmed by the largest value of impedance in electrochemical impedance spectroscopy studies.R.K. Gupta K. Mensah-Darkwa D. Kumar 2013Journal of Materials Science & Technology2013,29,2:10
3COREX工艺燃料比的影响因素显示文摘作为一种新型非高炉炼铁工艺,COREX工艺使用80%~85%非焦煤和15%~20%焦炭作为燃料,以满足对热量和还原剂的需求,并保证熔融气化炉内半焦床具有足够透气性。用于COREX工艺的非焦煤应满足一定的物化和高温性能,以稳定操作和提高产量。印度金达尔(JSW)钢铁厂拥有两座各年产80万t的COREX熔融还原炉,使用过几个煤种,发现不同煤种对操作会产生重要影响。统计分析表明,影响燃料比的主要因素包括煤的水分和挥发分、渣比和熔化速率。研究发现,生产率较高时,半焦床的稳定性和透气性就显得非常关键,因此反应后的半焦应具有较高的强度。P. P. Kumar D. Gupta T. K. Naha 张友平(译) 周渝生(校) 2007世界钢铁2007,7,1:9
4Differential Sensitivity of Macrocarpa and Microcarpa Types of Chickpea (Cicer arietinum L.) to Water Stress: Association of Contrasting Stress Response with Oxidative Injury显示文摘Chickpea (Cicer arietinum L.) 是特别地敏感的在它的繁殖阶段浇应力并且在水应力的条件下面,将放弃花和豆荚,因此减少收益潜力。有 chickpea 的二种类型:(i) Macrocarpa (Kabuli ) 它有大,击打塑造头的、轻棕色的种子;并且(ii ) Microcarpa (Desi ) 它有小、尖、黑暗褐的种子。相对说, Kabuli 被报导了更敏感比 Desi 浇应力。与对比敏感流水联系的内在的机制在新陈代谢的水平强调井没被理解。我们假设了一个原因因为在 chickpea 的二种类型的形成对照的水压力敏感可以是在氧化损害的一个变化。在现在的学习,两种类型的植物是为 14 d 在繁殖舞台强调的水。由于压力, Kabuli 类型与为 Desi 类型观察的 64% 减小相比在控制上在种子产量展出了 80% 减小。在叶水潜力(w) 的减少与 Desi 类型相比在 Kabuli 是更快的。在水压力时期的结束, w 被归结为 ? 2.9 并且 ? 分别地,没有他们之间的任何重要差别,在 Desi 和 Kabuli 的 3.1 MPa 打字。在应力的最后一天, Kabuli 比 Desi 经历了 20% 更多的膜损害。叶绿素内容和光合的率与 Kabuli 相比在 Desi 是显著地更大的。malondialdehyde 和 H2O2 内容与 Desi 相比在在 Kabuli 的水压力的结束是显著地更高的,显示在前者的更大的氧化应力。抗氧化剂的层次例如维生素酸和谷胱甘肽,比 Kabuli 在 Desi 是显著地更高的。, Superoxide dismutase 和过氧化氢酶活动没在第 10 天, ascorbate peroxidase 的活动, dehydroascorbate reductase,和谷胱甘肽 reductase 在 chickpea 的二种类型之间显著地不同在 Desi 是更高的。这些调查结果显示在 Desi 类型的更大的应力公差可以被归功于到它维持更好的水地位的优异能力,它导致更少的氧化损坏。另外,实验室研究由使 chickpea 的两种类型遭到到聚乙烯的类似的层次进行了导致乙二醇的水应力并且到 10 .mol/L abscisic,酸显示了 Desi 类型的一个更大的能力比 Kabuli 类型处理氧化应力。Harsh Nayyar Smita Singh Satwinder Kaur Sanjeev Kumar Hari D. Upadhyaya 2006Journal of Integrative Plant Biology2006,48,11:6
5Effect of micro-environmental factors on natural regeneration of Sal (Shorea robusta)显示文摘Micro-environmental factors viz., soil moisture and light in- tensity are important factors that affect natural regeneration in forests. These factors vary spatially depending on the overhead canopy density of the forest. The present study focused on studying the effect of variation of soil moisture and light intensity on natural regeneration of sal species (Shorea robusta) under different micro-environments due to overhead canopy of varying forest density. Experimental plots of 40m× 40m size were laid under different overhead canopy densities in a small sal for- ested watershed in the foot hills of Himalayas in Nainital District of Uttarakhand State, India. The plots were monitored on a long term basis for soil moisture at multi depths, light intensity and natural regeneration of sal. The results of the study revealed that the natural regeneration was highest under C1 (up to-0.30) canopy followed by C2 (0.30 0.50), and C3 (0.50 0.70) canopies. The C3 canopy showed the dying back of sal shoots over 4 years of study. The highest R 2 value of linear regression between incremental score of plot regeneration and average soil moisture content was obtained as 0.156 for average soil moisture content during non-monsoon months at 100 cm depth. The R 2 value between incre- mental score of plot regeneration and annual average light intensity was obtained as 0.688 which indicated that the regeneration is largely de- pendent on the light intensity conditions during the year. The multiple linear regression analysis between the incremental score of regeneration and the average light intensity and average soil moisture content revealed that that about 80% of variation in regeneration is explained by both the factors.J. V. Tyagi Rakesh Kumar S. L. Srivastava R. D. Singh 2011Journal of Forestry Research2011,22,4:4
6Cu–Co–O nano-catalysts as a burn rate modifier for composite solid propellants显示文摘Nano-catalysts containing copper–cobalt oxides(Cu–Co–O) have been synthesized by the citric acid(CA) complexing method. Copper(II) nitrate and Cobalt(II) nitrate were employed in different molar ratios as the starting reactants to prepare three types of nano-catalysts. Well crystalline nano-catalysts were produced after a period of 3 hours by the calcination of CA–Cu–Co–O precursors at 550 °C. The phase morphologies and crystal composition of synthesized nano-catalysts were examined using Scanning Electron Microscope(SEM), Energy Dispersive Spectroscopy(EDS) and Fourier Transform Infrared Spectroscopy(FTIR) methods. The particle size of nano-catalysts was observed in the range of 90 nm–200 nm. The prepared nano-catalysts were used to formulate propellant samples of various compositions which showed high reactivity toward the combustion of HTPB/AP-based composite solid propellants. The catalytic effects on the decomposition of propellant samples were found to be significant at higher temperatures. The combustion characteristics of composite solid propellants were significantly improved by the incorporation of nano-catalysts. Out of the three catalysts studied in the present work, Cu Co-I was found to be the better catalyst in regard to thermal decomposition and burning nature of composite solid propellants. The improved performance of composite solid propellant can be attributed to the high crystallinity, low agglomeration and lowering the decomposition temperature of oxidizer by the addition of Cu Co-I nano-catalyst.D. Chaitanya Kumar RAO Narendra YADAV Puran Chandra JOSHI 2016Defence Technology(防务技术)2016,12,4:3
7Design of crown pillar thickness using finite element method and multivariate regression analysis显示文摘Minerals are now being extracted from deep mines due to drying up of resource in shallow ground. The need for suitable supports and ground control mechanisms for safe mining necessitates proper pillar design with filling technology. In addition, high horizontal stress may cause collapse of hanging wall and footwall rocks, hence designing of suitable crown pillars is absolutely necessary for imposing overall safety of the stopes. This paper provides a methodology for the evaluation of the required thickness of crown pillars for safe operation at depth ranging from 600 m to 1000 m. Analyses are conducted with the results of 108 non-linear numerical models considering Drucker-Prager material model in plane strain condition. Material properties of ore body rock and thickness of crown pillars are varied and safety factors of pillars estimated. Then, a generalized statistical relationship between the safety factors of crown pillars with the various input parameters is developed. The developed multivariate regression model is utilized for generating design/stability charts of pillars for different geo-mining conditions.These design charts can be used for the design of crown pillar thickness with the depth of the working,taking into account the changes of the rock mass conditions in underground metal mine.Kumar Hemant Deb Debasis Chakravarty D. 2017International Journal of Mining Science and Technology2017,27,6:3
8Formability of galvanized interstitial-free steel sheets显示文摘Amit Kumar Gupta D. Ravi Kumar 2005Journal of Materials Processing Tech2005,,2:2
9Barium borosilicate glass – a potential matrix for immobilization of sulfate bearing high-level radioactive liquid waste显示文摘C.P. Kaushik R.K. Mishra P. Sengupta Amar Kumar D. Das G.B. Kale Kanwar Raj 2006Journal of Nuclear Materials2006,,2:2
10食物特异性IgG4抗体指导的限制性饮食可改善肠易激综合征症状和直肠顺应性Zar S. Mincher L. Benson M.J. Kumar D. 郝筱倩 2005世界核心医学期刊文摘(胃肠病学分册)2005,0,12:2
11MSH1 Is a Plant Organellar DNA Binding and Thylakoid Protein under Precise Spatial Regulation to Alter Development显示文摘作为新陈代谢的中心,植物细胞器参予维护,防卫,并且发信号。MSH1 是在线粒体和质体涉及 organellar 染色体稳定性的植物特定的蛋白质。MSH1 的质体弄空在开发和 DNA methylation 引起可继承的、非基因的变化。我们从抑制衬里到亚 compartmentalize MSH1 效果的 RNAi 用半互补异种和 transgene 空的 segregants 调查了 msh1 显型。我们证明那 MSH1 表情空间地被调整,明确地在外皮和脉管的实质以内本地化到质体。蛋白质绑 DNA 并且本地化 nucleoids,而是分别和蛋白质蛋白质相互作用数据到质体和 mitochondrial 显示 MSH1 也与 thylakoid 膜联系。在上色,不能生活的压力忍耐,可变生长率,和推迟的成熟的质体 MSH1 弄空结果。从在植物的 7%-10% 的线粒体结果的弄空在叶形态学,热忍耐,和 mitochondrial 染色体稳定性改变了。MSH1 不直接在原子核以内本地化,但是质体弄空在是 MSH1 的可继承的独立人士的 flowering 时间,成熟,和生长率生产非基因的变化。MSH1 弄空在质体和 mitochondrially 改变的线的一个子集改变非光敏的氧化还原作用行为。宫外的表示生产有害效果,加重它的严格的表达式控制。解开 MSH1 效果的复杂性提供卓见进扳机植物特定, transgenerational 改编行为。Kamaldeep S. Virdi Yashitola Wamboldt Hardik Kundariya John D. Laurie Ido Keren K.R. Sunil Kumar Anna Block Gilles Basset Steve Luebker Christian Elowsky Philip M. Day Johnna L. Roose Terry M. Bricker Thomas Elthon Sally A. Mackenzie 2016Molecular Plant2016,9,2:2
12Eclipta prostrata leaf aqueous extract mediated synthesis of titanium dioxide nanoparticles显示文摘G. Rajakumar A. Abdul Rahuman B. Priyamvada V. Gopiesh Khanna D. Kishore Kumar P.J. Sujin 2011Materials Letters2011,,:2
13Root structural and functional dynamics in terrestrial biosphere models – evaluation and recommendations显示文摘Jeffrey M. Warren Paul J. Hanson Colleen M. Iversen Jitendra Kumar Anthony P. Walker Stan D. Wullschleger 2015New Phytol2015,,1:2
14Identification of Adropin as a Secreted Factor Linking Dietary Macronutrient Intake with Energy Homeostasis and Lipid Metabolism显示文摘K. Ganesh Kumar James L. Trevaskis Daniel D. Lam Gregory M. Sutton Robert A. Koza Vladimir N. Chouljenko Konstantin G. Kousoulas Pamela M. Rogers Robert A. Kesterson Marie Thearle Anthony W. Ferrante Randall L. Mynatt Thomas P. Burris Jesse Z. Dong Heathe 2008Cell Metabolism2008,,:2
15Sulfamic acid: an efficient, cost-effective and recyclable solid acid catalyst for the Friedlander quinoline synthesis显示文摘J.S. Yadav P. Purushothama Rao D. Sreenu R. Srinivasa Rao V. Naveen Kumar K. Nagaiah A.R. Prasad 2005Tetrahedron Letters2005,,42:2
16Bamboo resources of Sikkim Himalaya: diversity, distribution and utilization显示文摘We recorded 8 genera and over 30 species of bamboo in Sikkim of the reported 23 genera and 125 species in India. Thirty percent of bamboo species were recorded in tropical forests(0–900 m), 40% of species in sub-tropical forests(900–1,800 m), 17% of species in temperate forests(1,800–2,700 m), 9% of species in sub-alpine forests(2,700–3,500 m) and 4% of species in alpine vegetation(3,500–4,500 m). Bamboo is used for various purposes and its versatility qualifies it to be a multiple-use alternative to timber, food for villagers and for tribal in particular. Bamboo is also equally important to Red Panda(Ailurus fulgens), the state animal of Sikkim. We develop a list of bamboos occurring in Sikkim with their vernacular names, distributions and uses in the Himalayan state. However, more extensive study is required to fully describe the bamboo diversity of the Himalayan state.Deo Kumar Tamang Dinesh Dhakal D. G. Shrestha 2014Journal of Forestry Research2014,25,4:1
17Influence of Bone-Lead Stores on the Observed Effectiveness of Lead Hazard Intervention显示文摘Steven W. Rust Priti Kumar David A. Burgoon Nancy A. Niemuth Bradley D. Schultz 1999Environmental Research1999,,3:1
18Identification of Modifiable and Nonmodifiable Risk Factors for Neurologic Deterioration after Acute Ischemic Stroke显示文摘James E. Siegler Amelia K. Boehme Andre D. Kumar Michael A. Gillette Karen C. Albright T. Mark Beasley Sheryl Martin-Schild 2013Journal of Stroke and Cerebrovascular Diseases2013,,:1
19A genetic approach to in vitro regeneration of non-regenerating cotton (Gossypium hirsutum L.) cultivars显示文摘S. Kumar P. Sharma D. Pental 1998Plant Cell Reports (-)1998,,1:1
20Persistence of Chlorpyrifos, Fenamiphos, Chlorothalonil, and Pendimethalin in Soil and Their Effects on Soil Microbial Characteristics显示文摘B. Kumar Singh A. Walker D. J. Wright 2002Bulletin of Environmental Contamination and Toxicology2002,,2:1
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