R. K. Aggarwal

Dr. Yashwant Singh Parmar University of Horticulture and Forestry

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G. Bhatia

University of Limerick

Prasad Hendre

World Agroforestry Centre

O.P. Bahl

CSIR National Physical Laboratory of India

Albert Lalremruata

German Center for Infection Research

Lalji Singh

Ranchi University

J. P. Gupta

Amity University

Karthikeyan Vasudevan

Centre for Cellular and Molecular Biology

Chhavi Dawar

Centre for Cellular and Molecular Biology

R. P. Yadav

Deen Dayal Upadhyaya Gorakhpur University

K. C. Majumdar

Centre for Cellular and Molecular Biology

Cooperative Institutions

Centre for Cellular and Molecular Biology

Universidade de São Paulo

Rede de Química e Tecnologia

Universidade Estadual de Campinas (UNICAMP)

Council of Scientific and Industrial Research

Universidade Federal de Viçosa

Universidade do Porto

Harvard University

Indian Agricultural Research Institute

CSIR National Physical Laboratory of India

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Identification, characterization and utilization of EST-derived genic microsatellite markers for genome analyses of coffee and related species

Theoretical and Applied Genetics (2006)

R. K. Aggarwal Prasad Hendre Rajeev K. Varshney Prasanna R. Bhat Vivek Krishnakumar

Primer (cosmetics)

10.1007/s00122-006-0440-x

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Citations (240)

District-Level Meteorological and Agriculture Drought Monitoring Through Satellite Technology

GEOINFORMATICS (2024)

Anil Kumar Singh Jayant Nath Tripathi Sapna Rawat Amit Kumar Akshay Patil

The purpose of this research was to examine the fundamentals of drought, including its classification, drought parameters, the importance of GIS remote sensing (RS) technology in drought monitoring, and the value of geographic information systems (GIS) in assessing drought. In recent years, global drought consequences have received more attention due to increased demand for water and climate change. Drought has been characterized as a natural threat by several climatic and hydro biological parameters. To evaluate drought effects, an understanding of the relationship between these two sets of parameters is important. Environmentalists, hydrologists, ecologists, geologists, meteorologists, and agricultural scientists are all interested 262in drought because of its impact on the environment, seasonal distribution according to rainy days, intensity, rain duration, and onset. Various environmental factors play an important role in drought incidences, such as the time of occurrence and features of rain, temperature, fast winds, and lower relative humidity involving crop growth and termination. Drought is constrained to low rainfall areas, which is the ultimate feature of the climate as a momentary irregularity. Sometimes, there is a misperception between heat waves and drought; however, the difference between them is highlighted, given that a heatwave is connected to a particular time on the weekly order, whereas drought can last for months or even years. The risk of drought is a product of natural hazard area exposure and its proneness to prolonged periods of water scarcity. If countries and territories are to find agreement in decreasing the devastating effects of drought, they must enhance their knowledge of the threat and the aspects that affect vulnerability. Building a complete and combined information technique that considers climates, soils, and factors for the supply of water, such as rainfall, temperature, moisture content in soil, reservoir and lake levels, groundwater levels, and streamflow, is essential for drought-prone areas in order to recognize their dry meteorology (meaning the probability that drought will occur at diverse degrees of magnitude for variable time durations). These inclusive drought indices make it simple to address the issue of food insecurity on a national scale and develop appropriate policies.

10.1201/9781003498452-17

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Hg++ induced anomalies in the foliar epidermal pattern of pearl millet and barley.

Ajay Srivastava R. K. Aggarwal S. M. Redy D. V. M. Rao Vidyavati

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Physical characteristics of baked carbon mixes employing coal tar and petroleum pitches

Journal of Materials Science (1978)

R. K. Aggarwal G. Bhatia

Coal tar

Carbon fibers

Petroleum product

10.1007/bf00548726

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Citations (7)

Journal of Materials Science Letters (2002)

G. Bhatia R. K. Aggarwal V. Raman Mitali Saha A. Mishra

10.1023/a:1020823314657

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Citations (2)

Reduction of ammonia volatilization from urea by rapid nitrification

Arid Land Research and Management (1988)

Praveen Kumar R. K. Aggarwal

Abstract Loss of NH3 from urea fertilizer in a cultivated sandy desert soil was evaluated by using various fertilizer treatment regimes. The nitrification of added urea increased with the pretreatment of (NH4)2SO4. The increase in nitrification rate was directly related to the amount of (NH4)2SO4 added. These results suggested that when urea was applied after sufficient increase in nitrification rate, i.e., 3 to 5 weeks after the pretreatment with NR+ 4 fertilizers, the NH+ 4 produced by the hydrolysis of urea was quickly nitrified, leaving low concentration of NH+ 4 in soil and resulting in decreased losses of NH3. Among the different NH+ 4 containing or forming fertilizers, (NH4)2SO4 was significantly better in arresting NH3 loss from a subsequent application of urea. The decreased loss of N was reflected in higher yields of pearl millet.

Volatilisation

Coated urea

10.1080/15324988809381166

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Citations (11)

Isolation and characterization of resistance gene analogues from Psilanthus species that represent wild relatives of cultivated coffee endemic to India

Genome (2011)

Prasad Hendre Prasanna R. Bhat Vivek Krishnakumar R. K. Aggarwal

Biotic or abiotic stress can cause considerable damage to crop plants that can be managed by building disease resistance in the cultivated gene pool through breeding for disease resistance genes (R-genes). R-genes, conferring resistance to diverse pathogens or pests share a high level of similarity at the DNA and protein levels in different plant species. This property of R-genes has been successfully employed to isolate putative resistance gene analogues (RGAs) using a PCR-based approach from new plant sources. Using a similar approach, in the present study, we have successfully amplified putative RGAs having nucleotide-binding-site leucine-rich repeats (NBS-LRR-type RGAs) from seven different sources: two cultivated coffee species ( Coffea arabica L. and Coffea canephora Pierre ex. A. Froehner), four related taxa endemic to India (wild tree coffee species: Psilanthus bengalensis (Roem. & Schuttles) J.-F. Leroy, Psilanthus khasiana , Psilanthus travencorensis (Wight & Arn.) J.-F. Leroy, Psilanthus weightiana (Wall. ex Wight & Arn.) J.-F. Leroy), and a cDNA pool originally prepared from light- and drought-stressed Coffea arabica L. leaves. The total PCR amplicons obtained using NBS-LRR-specific primers from each source were cloned and transformed to construct seven independent libraries, from which 434 randomly picked clones were sequenced. In silico analysis of the sequenced clones revealed 27 sequences that contained characteristic RGA motifs, of which 24 had complete uninterrupted open reading frames. Comparisons of these with published RGAs showed several of these to be novel RGA sequences. Interestingly, most of such novel RGAs belonged to the related wild Psilanthus species. The data thus suggest the potential of the secondary gene pool as possible untapped donors of resistance genes to the present day cultivated species of coffee.

Amplicon

R gene

Coffea canephora

Coffea

10.1139/g11-004

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Citations (8)

A comparative study of the electrical resistivities of different finely divided carbon materials under compression

Journal of Materials Science (1981)

R. K. Aggarwal G. Bhatia

Carbon fibers

10.1007/bf00542765