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486篇 您的检索式:作者名="S. Kumar"
    题名 作者 年代 出处 被引量
1Effect of Different Vegetation Systems on Soil Erosion and Soil Nutrients in Red Soil Region of Southeastern China显示文摘The effect of different vegetation systems including bamboo plantation (BP), forest ecosystem (CF),citrus orchard (Ctr) and farmland (FL) on erosion and nutrients of red soil were investigated in hilly region of southeastern China to find effective control measures for soil erosion. The results showed that all the vegetation systems could significantly reduce soil erosion and nutrient losses compared to bare land (Br).The ability of different vegetation systems to conserve soil and water was in the order of Ctr > BP > CF > FL > Br. Vegetation could also improve soil fertility. The soil organic matter, total N and total P contents were much higher in all the vegetation systems than in bare land, especially for the top soils. Vegetation systems improved soil physical properties remarkably. Compared to the bare land, soil organic matter, TP,TK and available K, especially soil microbial biomass C, N and P, increased under all the vegetation covers.However, they were still much lower than expected, thus these biological measurements are still needed to be carried out continuously.S. KUMAR 2003Pedosphere2003,13,2:57
2氧化石墨烯及其氧化铁复合物的原位合成(英文)显示文摘开发了在富氧Fe(acac)3络合物体系中膨化氧化石墨制取氧化石墨烯/Fe2O3复合物的一步法。应用FT-IR、XRD、VSM、AFM及低温直流电导测量法对所制氧化石墨/Fe2O3复合物进行表征。FT-IR研究结果显示:膨化后,氧化石墨的环氧基团分解,同时形成了氧化铁粒子与氧化石墨烯复合物。AFM测试表明:在较高Fe2O3含量下,氧化石墨烯片层结构剥蚀形成厚达5mm氧化石墨烯叠层。VSM研究显示:在室温和0.13emu/g^5.5emu/g范围内,全部复合物呈铁磁特性。这些复合物的导电性受控于准电子跃迁机制。V. K. Singh M. K. Patra M. Manoth G. S. Gowd S. R. Vadera N. Kumar 2009新型炭材料2009,24,2:23
3Heteromeric and Homomeric Geranyl Diphosphate Synthases from Catharanthus roseus and Their Role in Monoterpene Indole Alkaloid Biosynthesis显示文摘Catharanthus roseus 是二很重要的 monoterpene 吲哚碱(MIA ) 的唯一的来源反癌症代理人:vinblastine 和长春新碱。MIA 拥有萜烯和分别地从 terpenoid 和 shikimate 小径导出的吲哚一半。Geranyl diphosphate (GPP ) ,入口点到萜烯一半的形成,由 GPP synthase (GPPS ) 是 isopentenyl diphosphate (IPP ) 和 dimethylallyl diphosphate (DMAPP ) 的冷凝作用的一个产品。这里,我们报导与顺序类似编码蛋白质到大子单元(CrGPPS.LSU ) 和 heteromeric GPPS,和 homomeric 的小子单元(CrGPPS.SSU ) 的三基因 GPPS。CrGPPS.LSU 是生产 GPP 和 geranyl geranyl diphosphate (GGPP ) 的 bifunctional 酶, CrGPPS.SSU 是不活跃的,而 CrGPPS 是形成 GPP 的 homomeric 酶。在 Escherichia coli 的两个子单元的合作表示与生产仅仅 GPP 的提高的活动导致了 heteromeric 酶。当 CrGPPS.LSU 和 CrGPPS 在更旧、更年轻的叶子显示出更高的表示时,分别地, CrGPPS.SSU 显示出一个增加的趋势并且逐渐地减少了。叶子的甲基 jasmonate (MeJA ) 处理显著地导致了仅仅 CrGPPS.SSU 的表示。而 CrGPPS 是 mitochondrial, GFP 本地化显示 CrGPPS.SSU 是 plastidial。在 C 的 AmGPPS.SSU 的短暂 overexpression。roseus 叶子导致了增加的 vindoline, vinblastine 和长春新碱的立即的 monomeric 先锋。尽管 C。roseus 有 heteromeric 和 homomeric GPPS 酶,我们的结果含有有为 MIA 生合成调整 GPP 流动的 CrGPPS.SSU 的仅仅 heteromeric GPPS 的参与。Avanish Rai Shachi S. Smita Anup Kumar Singh Karuna Shanker Dinesh A. Nagegowda 2013Molecular Plant2013,6,5:20
4Enrichment-ELISA for Detection of Salmonella typhi From Food and Water Samples显示文摘Objective Development of monoclonal antibody based sandwich enzyme linked immunosorbant assay (sELISA) for rapid detection of Salmonella enterica serovar typhi (S. typhi) from food and water samples and optimization of enrichment procedures for use with the developed sELISA to increase the detection sensitivity of the assay. Methods Spleen cells from BALB/c mice immunized with flagellin (H=d) antigen of S. typhi were fused with Sp2/0 myeloma cells. The hybridoma cell line specific to H=d antigen was established, characterized and ascites raised against one of these clones. The hyperimmune serum to flagellin antigen was raised in New Zealand White rabbits. An sELISA was developed using polyclonal antibody as capture and monoclonal antibody as detection antibody. To design the efficient culture strategies for use with the sELISA, different pre-enrichment and enrichment broths were evaluated. The media included buffered peptone water (BPW) and brain heart infusion broth for pre-enrichment and selenite F broth and Rappaport-Vassiliadis broth as enrichment broths. The developed sELISA with preceding enrichment step in BPW (Enrichment-ELISA) was evaluated in various food samples artificially inoculated with S. typhi bacteria. Various food (30) and water (35) samples collected from field were also tested by Enrichment-ELISA and culture method. Results Out of four specific clones to H=d antigen, one clone (# 2/56, IgG2a isotype) was used in sELISA. The sELISA had the detection limit of 104-105 cfu of S. typhi. Of the various broths used with sELISA, BPW was found to yield maximum ELISA values. Enrichment-ELISA, when tested in artificially inoculated food samples, generally, could detect 102 S. typhi cfu/mL within 10 h from various food rinses (meat, vegetable) and milk samples. After overnight enrichment in BPW, as less as 2 bacteria per 10 mL of milk, meat rinse, and chicken rinse could be detected. Only one of the field samples (water) gave false positive result by Enrichment-ELISA. Conclusion In comparison to culture, the Enrichment-ELISA is a rapid, sensitive, and specific method for detection of S. typhi from food or water samples. This method may be used as rapid screening procedure for environmental monitoring during outbreak situation.S. KUMAR K. BALAKRISHNA HV. BATRA 2008Biomedical and Environmental Sciences2008,21,2:16
5分层功能分级梁的弯曲和自由振动响应:理论模型和试验验证显示文摘通过静力和自由振动响应试验,基于分层功能分级梁模型,结合有效弹性模量的混合修正规则,验证了三阶Zigzag理论。分别采用粉末冶金和热喷雾技术构成的铝/碳化硅和镍/三氧化二铝两个体系来验证。将陶瓷含量为0%~40%分层梁的理论预测与简支和悬臂边界条件下的静挠度以及悬臂和固支边界条件下的自然频率试验结果进行了对比。采用混合修正规则的预测与两个体系的试验结果十分吻合,而基于性能估计的混合线性规则导致结果的误差较高。讨论了层数对理论模型精度的影响。预测结果的精确性证明了两个体系中分层制造时混合修正规则中应力一应变传递系数值是准确可信的,也证明了Zigzag理论在精确模拟分层梁力学性能方面的能力。Kapuria S. Bhattacharyya M Kumar A.N. 2008钢结构2008,23,7:12
6Efficacy 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
7Applying real time seismic monitoring technology for slope stability assessment—An Indian opencast coal mine perspective显示文摘This paper outlines the results obtained from real time microseismic monitoring of an opencast coal mine in South India.The objective of the study is to investigate the stress changes within the rockmass along the slope due to underground mine development operation and their impact on the stability of the highwall slope.The installed microseismic systems recorded the seismic triggerings down toà2 moment magnitude.In general,most of the events recorded during the monitoring period are weak in seismic energy.The study adopts a simple and more reliable tool to characterize the seismically active zone for assessing the stability of the highwall in real time.The impact of underground working on the slope is studied on the basis of the seismic event impact contours and seismic clusters.During the monitoring period,it is observed that the intensity of the overall microseismic activity along the slope due to the mine development operations did not cause any adverse impact on the highwall stability.Vinoth S. Ajay Kumar L. 2014International Journal of Mining Science and Technology2014,24,1:9
8APASL consensus statements and management algorithms for hepatitis C virus infection显示文摘Masao Omata Tatsuo Kanda Ming-Lung Yu Osamu Yokosuka Seng-Gee Lim Wasim Jafri Ryosuke Tateishi Saeed S. Hamid Wan-Long Chuang Anuchit Chutaputti Lai Wei Jose Sollano Shiv Kumar Sarin Jia-Horng Kao Geoffrey W. McCaughan 2012Hepatology International2012,,2:8
9H2A.Z at the Core of Transcriptional Regulation in Plants显示文摘S. Vinod Kumar 2018Molecular Plant2018,11,9:7
10Flotation studies on low grade graphite ore from eastern India显示文摘A low grade graphite ore from eastern India was beneficiated by flotation to improve its quality. The ore was composed of 87.80% ash and 8.59% fixed carbon. Primary coarse wet grinding(d80: 186 lm) followed by rougher flotation in Denver flotation cell using diesel as collector and pine oil as frother yielded a rougher concentrate. Regrinding(d80: 144 lm) of this rougher concentrate was opted for further liberation of graphite. It was followed by cleaning in laboratory flotation column. This combined process of relatively coarse primary grinding followed by regrinding and cleaning in flotation column resulted in final concentrate of 7.44% yield with 89.65% fixed carbon and 6.00% ash. This approach of two-stage grinding to recover the flake graphite at the coarsest possible grind can help to minimize grinding energy costs. A conceptual flow sheet which is cost effective was developed based on this methodology.Vasumathi N. Vijaya Kumar T.V. Ratchambigai S. Subba Rao S. Bhaskar Raju G. 2015International Journal of Mining Science and Technology2015,25,3:6
11响应面方法在奥氏体不锈钢与铜合金异种材料摩擦焊接头的抗拉强度最大化和界面硬度最小化中的应用(英文)显示文摘在奥氏体不锈钢与铜合金异种材料摩擦焊接过程中,采用响应面方法优化摩擦焊接工艺参数,以获得抗拉强度最大和界面硬度最小的焊接接头。采用三因素、五水平中心复合正交矩阵来确定实验条件。得到20个焊接接头,测定了焊接接头的抗拉强度和界面硬度。采用方差分析(ANOVA)方法来确定起显著作用的、主要的及相互作用的参数,使用回归分析得到经验关系模型。用设计专家软件构造响应图和等高线图来优化摩擦焊接工艺参数。用得到的经验关系模型可以有效地预测焊接接头的抗拉强度和界面硬度,其置信水平达95%。从形成的等高线图可以得到所需的摩擦焊接的最佳条件。G. VAIRAMANI T. SENTHIL KUMAR S. MALARVIZHI V. BALASUBRAMANIAN 2013Transactions of Nonferrous Metals Society of China2013,23,8:5
12Beneficiation of an Indian non-coking coal by column flotation显示文摘N. Vasumathi T. V. Vijaya Kumar S. Ratchambigai S. Subba Rao S. Prabhakar G. Bhaskar Raju 2016International Journal of Coal Science & Technology2016,3,2:5
13Biomechanics of knee joint-- A review显示文摘现在的纸是知道工作怎么在膝的 biomechanics 的领域里被执行。各种各样的模型明确的表达被讨论并且进一步分类进数学模型,二维的模型和三维的模型。膝几何学是人的身体运动,膝看怎么各种各样,在不同飞机在并且怎么被看的关键部分胫骨和腿节上的力量行为被学习。它导致知道对膝关节起作用的力量。对各种各样的研究人员显示出的膝起作用的膝几何学和力量的试验性的研究被讨论了,并且结果的比较被做。另外,膝的静态、动态的分析也分别地被讨论了到某程度。Bhaskar Kumar MADETI Srinivasa Rao CHALAMALASETTI S. K. Sundara siva rao BOLLA PRAGADA 2015Frontiers of Mechanical Engineering2015,10,2:4
14Optimization of fused deposition modeling process parameters using a fuzzy inference system coupled with Taguchi philosophy显示文摘Saroj Kumar Padhi Ranjeet Kumar Sahu S. S. Mahapatra Harish Chandra Das Anoop Kumar Sood Brundaban Patro A. K. Mondal 2017Advances in Manufacturing2017,5,3:4
15A Versatile Phenotyping System and Analytics Platform Reveals Diverse Temporal Responses to Water Availability in Setaria显示文摘Phenotyping 在使用大规模 genomic 数据理解并且改善农业庄稼成为了限制率的步。这里,为控制环境植物生长的系铃羊 Phenotyping 站台和 automatedmultimodal phenotyping 被描述。系统为 1140 植物有能力,它每天通过车站过去记录荧光,在红外线附近、可见的图象。植物计算机视觉(PlantCV ) 作为公开源码被开发,硬件为量的图象分析的与平台无关的软件。在一个 4 星期的实验,野 Setaria viridisand 驯养了 Setaria italica 有根本上不同的时间的回答浇可获得性。当两根线在有限的水条件下面生产了生物资源的类似的层次时, Setaria viridis 在水下面维持了一样的水使用效率饱满条件,当 Setaria italica 变了到不太有效的生长时。总的来说,系铃羊 Phenotyping 平台和 PlantCV 软件在高度,生物资源,水使用效率,颜色,植物建筑学,和织物水上检测了 genotypeand 环境的重要效果地位特点。在实验的功课期间获得的所有 ∼79000 图象是公开可得到的。Noah Fahlgren Maximilian Feldman Malia A. Gehan Melinda S. Wilson Christine Shyu Douglas W. Bryant Steven T. Hill Colton J. McEntee ankalpi N. Warnasooriya Indrajit Kumar Tracy Ficor Stephanie Turnipseed Kerrigan B. Gilbert Thomas P. Brutnell James C. Carrington Todd C. Mockler Ivan Baxter 2015Molecular Plant2015,8,10:4
16Effect 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
17Sugar-Hormone Cross-Talk in Seed Development: Two Redundant Pathways of IAA Biosynthesis Are Regulated Differentially in the Invertase- Deficient miniature 1 (mn 1) Seed Mutant in Maize显示文摘Prem S. Chourey Qin-Bao Li Dibyendu Kumar 2010Molecular Plant2010,3,6:3
18APASL consensus statements and management algorithms for hepatitis C virus infection显示文摘Masao Omata Tatsuo Kanda Ming-Lung Yu Osamu Yokosuka Seng-Gee Lim Wasim Jafri Ryosuke Tateishi Saeed S. Hamid Wan-Long Chuang Anuchit Chutaputti Lai Wei Jose Sollano Shiv Kumar Sarin Jia-Horng Kao Geoffrey W. McCaughan 2012Hepatology International2012,,2:3
19Soil Aggregates, Organic Matter, and Labile C and N Fractions after 37 Years of N, P and K Applications to an Irrigated Subtropical Soil under Maize-Wheat Rotation显示文摘S. Kumar M. S. Aulakh A. K. Garg 2011Journal of Agricultural Science and Technology(A)2011,1,2X:3
20High frequency oscillatory ventilation versus synchronized intermittent mandatory ventilation in preterm neonates with hyaline membrane disease: A randomized controlled trial显示文摘S. Singh G. Malik G. Prashanth Anita Singh Mala Kumar 2012Indian Pediatrics2012,,5:3
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