Amarnatha N

@uasbangalore.edu.in

Asst. Professor of Sericulture
University of Agricultural Sciences, GKVK, Bangalore

Amarnatha N


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https://researchid.co/amarseri
3

Scopus Publications

37

Scholar Citations

3

Scholar h-index

1

Scholar i10-index

Scopus Publications

  • In-vitro evaluation of chitosan against bacterial pathogens of silkworm, Bombyx mori L.
    BHUVANESHWAR RAJESH NAIK, N. AMARNATHA, K. C. NARAYANASWAMY, MANJUNATH GOWDA, D. V. NAVEEN
    Journal of Biological Control, 2025
    The present research work was carried out to know the efficacy of the silkworm pupal chitosan against the bacterial pathogens of silkworm Bombyx mori L. under in-vitro conditions. Chitosan was isolated from silkworm pupae and their exuviae through a meticulous three stage extraction process viz., deproteinisation, demineralisation and deacetylation. The extracted chitosan, prepared in various concentrations (i.e., 500-5000 ppm), was rigorously evaluated against the pathogenic bacteria of B. mori (Staphylococcus aureus and Bacillus thuringiensis) under in-vitro conditions. These tests were conducted using nutrient agar plates, with the efficacy of each concentration benchmarked against standard ampicillin and a commercial chitosan preparation by assessing their inhibitory effect through measuring the inhibition zones around treated discs. The antibacterial activity increased with chitosan concentration, with the highest zone of inhibition observed at 5000 ppm (1.191 cm for S. aureus and 1.100 cm for B. thuringiensis), which was on par with the treatment ampicillin and commercial chitosan at 1000 ppm. Concentrations ≥2000 ppm showed antibacterial efficacy comparable to standards at 1000 ppm. The antimicrobial action is attributed to the interaction between positively charged amino groups of chitosan and bacterial teichoic acids, resulting in cell wall rupture and death of bacteria. The in-vitro study reveals that, silkworm pupal chitosan exerts potent antibacterial activity against S. aureus and B. thuringiensis, particularly at ≥4,500 ppm. This valorises a sericultural by-product, offering a sustainable alternative to synthetic bactericides. The findings hold promise for enhancing silkworm health management and optimising sericulture productivity.
  • Biochemical constituents of different mulberry varieties grown under "Seri Suvarna" technology with protective irrigation
    Indian Journal of Ecology, 2016
  • Management of mulberry thrips
    Indian Silk, 2006

RECENT SCHOLAR PUBLICATIONS

  • In-vitro evaluation of chitosan against bacterial pathogens of silkworm, Bombyx mori L.
    BR NAIK, N AMARNATHA, KC NARAYANASWAMY, M GOWDA, ...
    Journal of Biological Control 39 (4) , 2025
    2025
  • Chitosan Modulates Time-dependent Lipid Profiles and Lipase Activity in Infected Silkworms
    BR Naik, N Amarnatha, NS Mamatha, P Chavan, MS Kruthika, S Almelkar, ...
    Journal of Advances in Biology & Biotechnology 28 (10), 958-968 , 2025
    2025
  • Modulation of Silkworm Haemolymph Proteins and Proteases by Chitosan: A Defense Mechanism against Bacterial Infection
    N Amarnatha, BR Naik, NS Mamatha, MS Kruthika, P Chavan, ...
    UTTAR PRADESH JOURNAL OF ZOOLOGY 46 (18), 329-355 , 2025
    2025
  • Chitosan Mitigates Bacterial Infection-induced Metabolic Stress in Silkworms: A Study on Carbohydrate and Amylase Dynamics
    N Amarnatha, BR Naik, MS Kruthika, NS Mamatha, H Sangreskop, ...
    Journal of Advances in Biology & Biotechnology 28 (9), 903-913 , 2025
    2025
  • Chitosan's Role in Enhancing Rearing Parameters in Bacterial-infected Silkworms
    BR Naik, N Amarnatha, NS Mamatha, MS Kruthika, H Sangreskop, ...
    UTTAR PRADESH JOURNAL OF ZOOLOGY 46 (17), 72-87 , 2025
    2025
  • Chitosan-mediated Resilience in Bacterial Infected Silkworms: A Study on Grainage Parameters
    BR Naik, N Amarnatha, KC Narayanaswamy, M Gowda, DV Naveen
    Journal of Advances in Biology & Biotechnology 28 (9), 763-774 , 2025
    2025
  • A new horizon in chitosan research: Silkworm-derived biopolymer and its applications
    Bhuvaneshwar, R.N., Amarnatha, N., Kruthika, M.S., Pritish Chavan, Praveen ...
    Archives of Current Research International 25 (8), 840-851 , 2025
    2025
  • Optimizing growth, yield, and profitability in finger millet (Eleusine coracana L.) through diverse nutrient sources
    N Chaya, B.C., Shubhashree, K.S., Sushmita, G. Bilur, Dinesh, M.S., Nalini ...
    International Journal of Advanced Biochemistry Research 9 (8), 968-974 , 2025
    2025
  • Chitosan-infused resilience: uplifting cocoon and post cocoon traits in silkworms infected with bacterial infections
    KSHS Bhuvaneshwar Rajesh Naik, Amarnatha, N., Mamatha, N.S., Shubhashree
    International Journal of Advanced Biochemistry Research 9 (8), 835-844 , 2025
    2025
  • A review on feasibility of silkworm pupal meal in livestock and poultry
    Dukare Pradip, G., Thrilekha, D., Harish Reddy, C., Kenchappa, N.M. and ...
    Uttar Pradesh Journal of Zoology 45 (13), 282 – 293 , 2024
    2024
  • Correlation studies between biochemical and physiological parameters of silkworm haemolymph with economic characteristics of silkworm, Bombyx mori L.
    NS Sandhya, N., Amarnatha, N., Ranjitha Bai, H., Shivanna, B. and Mamatha
    International Journal of Science Academic Research 5 (10), 8373 - 8378 , 2024
    2024
  • Impact of Adoption of Mulberry and Silkworm Practice on Yield and Income of Bivoltine Hybrid Silkworm Rearing Sericulturists of South Eastern Dry Zone of Karnataka
    N Amarnatha, M Narmada, NS Mamatha, MT Lakshminarayan, ...
    Journal of Advances in Biology & Biotechnology 27 (9), 550-555 , 2024
    2024
  • Recent Developments in Endocrinology of Silkworm, Bombyx mori L.
    N Amarnatha, DP Gulabrao, BR Naik, NS Mamatha, KC Narayanaswamy, ...
    Archives of Current Research International 24 (7), 163-174 , 2024
    2024
  • Physicochemical Properties of Chitosan Extracted from Silkworm (Bombyx mori L.) Exuviae
    DP Gulabrao, N Amarnatha, H Reddy, K NM, NC Reddy
    JOURNAL OF ADVANCES IN BIOLOGY & BIOTECHNOLOGY Учредители: Sciencedomain … , 2024
    2024
  • Physicochemical characterization of oil and chitosan extracted from cross breed and bivoltine hybrid silkworm pupae: a comparative analysis
    KSMG Dukare Pradip G., Amarnatha, N., Narayanaswamy, K.C., Narayana Reddy, R ...
    Journal of Advances in Biology & Biotechnology 27 (8), 1126-1136 , 2024
    2024
  • Effect of pesticide’s residue on the physiological changes in the silkworm (Bombyx mori L.) haemolymph
    N Sandhya N., Amarnatha, N., Narayanaswamy, K.C., Manjunath Gowda and Nagesha
    Biological Forum – An International Journal 16 (8), 225-231 , 2024
    2024
  • Challenges and Adoption of Bivoltine Hybrid Silkworm Rearing in Karnataka's South-Eastern Dry Zone, India
    H SANGRESKOP
    JOURNAL OF EXPERIMENTAL AGRICULTURE INTERNATIONAL Учредители: Sciencedomain … , 2024
    2024
    Citations: 1
  • Effect of pesticide’s residue on commercial parameters of the silkworm, Bombyx mori L
    KBS Sandhya, N., Amarnatha, N., Bharath
    The Pharma Innovation Journal 13 (7), 34-38 , 2024
    2024
  • Smart Farming The Need of Hour
    P HumaKousar Sangreskop, Amarnatha, N., Dakshayini, G., Manjunatha, R ...
    Skill Development Centre, UAS, GKVK, Bengaluru – 560 065 , 2023
    2023
  • Per-se Performance of Six Generations of Crosses between Muscardine Resistant Thermotolerant Bivoltine Breeds and Muscardine Susceptible Productive Bivoltine Breed of Silkworm …
    MG CHANDRAKALA, KC NARAYANASWAMY, N AMARNATHA
    Mysore J. Agric. Sci 56 (3), 83-92 , 2022
    2022

MOST CITED SCHOLAR PUBLICATIONS

  • Management of mulberry thrips
    KC Hadimani, D.K., Amarnatha, N., Manjula, G. and Narayanaswamy
    Indian Silk 44 (12), 11-12 , 2006
    2006
    Citations: 13
  • Integrated organic based nitrogen management approach in mulberry on larval traits of silkworm (Bombyx mori L.)
    N Amarnatha, TK Narayanaswamy, MA Shankar, KR Sreeramula, ...
    International Journal of Science and Nature 2 (3), 452-455 , 2011
    2011
    Citations: 6
  • Some thermotolerant bivoltine silkworm breeds tolerate white muscardine diseases caused by Beauveria bassiana (Bals.-Criv) vuill. infection
    N Keerthana, A., Manjunatha Gowda, Narayanaswamy, K.C. and Amarnatha
    International Journal of Chemical Studies 8 (4), 86 - 94 , 2019
    2019
    Citations: 3
  • Productivity and quality of tree mulberry (Morus alba L.) leaves
    NMG Vanitha, C., Narayanaswamy, K.C., Amarnatha
    International Journal of Chemical Studies 7 (3), 1384 – 1389 , 2019
    2019
    Citations: 3
  • Studies on correlation between biochemical composition and pest infestation in different mulberry genotypes.
    KV Prabhakar, NN Neelu Nangia, RN Reddy, N Amarnatha
    2013
    Citations: 3
  • Post Cocoon Traits of Thermotolerant Bivoltine Silkworm Breeds as Affected by White Muscardine.
    A Keerthana, M Gowda, KC Narayanaswamy, N Amarnatha
    Mysore Journal of Agricultural Sciences 53 (2), 1 , 2019
    2019
    Citations: 2
  • Faunistic diversity of insect and predatory spiders on tree mulberry in Chikkaballapura and Kolar districts of Karnataka
    N Vanitha, C., Narayanaswamy, K.C., Jagadish, K.S., Manjunath Gowda and ...
    Journal of Entomology and Zoology Studies 7 (2), 752-757 , 2019
    2019
    Citations: 2
  • Role of integrated nutrient management in mulberry and its impact on seed and commercial cocoon production
    N Amarnatha
    University of Agricultural Sceinces , 2007
    2007
    Citations: 2
  • Challenges and Adoption of Bivoltine Hybrid Silkworm Rearing in Karnataka's South-Eastern Dry Zone, India
    H SANGRESKOP
    JOURNAL OF EXPERIMENTAL AGRICULTURE INTERNATIONAL Учредители: Sciencedomain … , 2024
    2024
    Citations: 1
  • Phytotonic effect of Jatropha curcas L. on metric traits of silkworm, Bombyx mori L.
    DK Hadimani, N Amarnatha, KC Narayanaswamy
    2006
    Citations: 1
  • Barkesseru ( Ailanthus excelsa Roxb.), an ideal substitute for castor to rear eri silkworm, Samia cynthia ricini Boisduval.
    KC Narayanaswamy, KS Kumari, MG Manjunath Gowda, N Amarnatha
    2006
    Citations: 1
  • In-vitro evaluation of chitosan against bacterial pathogens of silkworm, Bombyx mori L.
    BR NAIK, N AMARNATHA, KC NARAYANASWAMY, M GOWDA, ...
    Journal of Biological Control 39 (4) , 2025
    2025
  • Chitosan Modulates Time-dependent Lipid Profiles and Lipase Activity in Infected Silkworms
    BR Naik, N Amarnatha, NS Mamatha, P Chavan, MS Kruthika, S Almelkar, ...
    Journal of Advances in Biology & Biotechnology 28 (10), 958-968 , 2025
    2025
  • Modulation of Silkworm Haemolymph Proteins and Proteases by Chitosan: A Defense Mechanism against Bacterial Infection
    N Amarnatha, BR Naik, NS Mamatha, MS Kruthika, P Chavan, ...
    UTTAR PRADESH JOURNAL OF ZOOLOGY 46 (18), 329-355 , 2025
    2025
  • Chitosan Mitigates Bacterial Infection-induced Metabolic Stress in Silkworms: A Study on Carbohydrate and Amylase Dynamics
    N Amarnatha, BR Naik, MS Kruthika, NS Mamatha, H Sangreskop, ...
    Journal of Advances in Biology & Biotechnology 28 (9), 903-913 , 2025
    2025
  • Chitosan's Role in Enhancing Rearing Parameters in Bacterial-infected Silkworms
    BR Naik, N Amarnatha, NS Mamatha, MS Kruthika, H Sangreskop, ...
    UTTAR PRADESH JOURNAL OF ZOOLOGY 46 (17), 72-87 , 2025
    2025
  • Chitosan-mediated Resilience in Bacterial Infected Silkworms: A Study on Grainage Parameters
    BR Naik, N Amarnatha, KC Narayanaswamy, M Gowda, DV Naveen
    Journal of Advances in Biology & Biotechnology 28 (9), 763-774 , 2025
    2025
  • A new horizon in chitosan research: Silkworm-derived biopolymer and its applications
    Bhuvaneshwar, R.N., Amarnatha, N., Kruthika, M.S., Pritish Chavan, Praveen ...
    Archives of Current Research International 25 (8), 840-851 , 2025
    2025
  • Optimizing growth, yield, and profitability in finger millet (Eleusine coracana L.) through diverse nutrient sources
    N Chaya, B.C., Shubhashree, K.S., Sushmita, G. Bilur, Dinesh, M.S., Nalini ...
    International Journal of Advanced Biochemistry Research 9 (8), 968-974 , 2025
    2025
  • Chitosan-infused resilience: uplifting cocoon and post cocoon traits in silkworms infected with bacterial infections
    KSHS Bhuvaneshwar Rajesh Naik, Amarnatha, N., Mamatha, N.S., Shubhashree
    International Journal of Advanced Biochemistry Research 9 (8), 835-844 , 2025
    2025