Publications by authors named "Manoharan Natesan"

Cymodocea serrulata mediated titanium dioxide nanoparticles (TiO NPs) were successfully synthesized. The XRD pattern and FTIR spectra demonstrated the crystalline structure of TiO NPs and the presence of phenols, flavonoids and alkaloids in the extract. Further SEM revealed that TiO NPs has uniform structure and spherical in shape with their size ranged from 58 to 117 nm.

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In this study, the anti-biofilm compound of 2,6-Di-tert-butyl, 1,4-benzoquinone was purified from Nocardiopsis synnemataformans (N. synnemataformans) RMN 4 (MN061002). To confirm the compound, various spectroscopy analyses were done including ultraviolet (UV) spectrometer, Fourier transform infrared spectroscopy (FTIR), analytical high-performance liquid chromatography (HPLC), preparative HPLC, gas chromatography-mass spectroscopy (GC-MS), liquid chromatography-mass spectroscopy (LC-MS), and 2D nuclear magnetic resonance (NMR).

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Article Synopsis
  • The study examined the effects of modified silver nanoparticles on two bacterial cultures, Proteus mirabilis and Klebsiella pneumoniae, revealing effective antibacterial activity at various concentrations.
  • The zones of inhibition indicated significant growth suppression, with P. mirabilis showing larger inhibition zones compared to K. pneumoniae at higher nanoparticle concentrations.
  • Additionally, the silver nanoparticles were found to inhibit growth in A549 lung cancer cells at a concentration of 500 µg/mL, highlighting their potential as a dual-purpose treatment for both bacterial infections and cancer.
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Recent years, metal pollution is an alarming factor to know about protects the environmental ecosystem due to the toxic, persistent and abundant in nature. Metals are present everywhere in the biotic and abiotic samples including soil, water, and microbes. The rate of bioaccumulation and biotransformation are very high.

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Background: Recent years, multi drug resistant pathogens and their pathogenicity were increased worldwide due to unauthorized consumption of antibiotics. In addition, correlation between multi drug resistant bacteria and biofilm formation is heightened due to the production of more virulence behavior. There is no better identification methods are available for detection of biofilm producing gram negative bacteria.

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Background: Recent years, the treatment of multi-drug resistant bacteria and their effect are very difficult due to the virulence factors modification. Based on the world wide thread, we have tried to identify the ESBLs producing bacteria from urinary tract infection patients. In result, the highly antibiotic resistant effect of Pseudomonas aeruginosa and Klebsiella pneumoniae were identified.

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Background: Worldwide, multi-drug resistant Klebsiella pneumoniae (K. pneumonia) and their virulence's were contributed more in the multi-drug resistant effect. According to the World Health organization report, it is an emerging thread in developing countries and also comes under first ever critical list.

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Based on the excellent nutrient level, the current study was focused on isolation and anti-bacterial activity of the from marine mangrove soil samples. As result, 10 different strains of strains were identified on isolation agar plates. The identified strains were shown with white, clear, uncontaminated well matured spore producing ability.

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Article Synopsis
  • Researchers isolated a bioflocculant-producing actinobacterium, Nocardiopsis sp. GRG 3, from heavy metal-contaminated marine environments to address toxic heavy metal removal efficiently.
  • The strain showed a maximum flocculating activity of 80.90% at pH 7 with CaCl ions and glucose, and it was characterized by functional groups indicative of polysaccharides and proteins.
  • The bioflocculant effectively removed substantial amounts of heavy metals, including 55.90% Cadmium, 85.90% Chromium, 74.7% Lead, and 51.90% Mercury, suggesting its potential for sustainable environmental management.
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In this study, the phytochemical, phenolic, flavonoid and bioactive compounds were successfully screened from crude extract of by LC-MS analysis after NIST interpretation. Bacterial growth inhibition study result was shown with 24 mm zone inhibition at 200 µg/mL concentration against . The increased phenolic content was much closed to gallic acid and the range was observed at 250 μg/mL concentration.

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Article Synopsis
  • The study used the disc diffusion method to identify multi-drug resistant strains of K. pneumoniae, focusing on its resistance to carbapenem antibiotics.
  • The research involved detecting specific carbapenemase genes (VIM 1 and IMP 1) in the bacteria using multiplex PCR and assessing antibiotic effectiveness through minimum inhibition concentration tests.
  • Results confirmed that the K. pneumoniae strains not only produced carbapenemase but also exhibited strong biofilm formation, enhancing their virulence.
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The is excellent marine green algae, which produced enormous bioactive compounds with more biological activities. Also, it is an excellent source for synthesis of Ag NPs with increased bioactivity against various infections. In our study, the marine algae marine algae mediated Ag NPs was synthesized effectively.

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Objective: The present investigation was aimed to evaluate the hepatoprotective potential of ethanolic extract of () and its isolated quercetin fraction on carbon tetrachloride (CCl)-induced hepatotoxicity.

Materials And Methods: The rats were divided into 6 groups and each group contained 6 rats. CCl (1.

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The biosynthesized Ag NPs was synthesized by using marine mangrove plant extract . The synthesized Ag NPs was confirmed by various physiochemical characterization including UV-spectrometer and XRD analysis. In addition, the shape and of the synthesized Ag NPs was morphologically identified by SEM initially and TEM finally.

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Recent years () biofilm formation (BF) is emerging thread worldwide. For tackling this problem, we have chosen Hibiscus rosa-. pneumoniae.

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In the present study, the chemical composition of Morinda citrifolia essential oils was determined by gas chromatography-mass spectrometry and was found to contain several anti-cancer compounds including L-scopoletin, nordamnacanthal, β-morindone, α-copaene, 9-H-pyrido[3,4-b]indole, β-thujene and terpinolene. The physico-chemical characterization of chitosan, chitosan nanoparticles and Morinda citrifolia essential oils loaded chitosan nanoparticles combination was carried out by Fourier transform infrared spectroscopy, powder X-ray diffraction and dynamic light scattering coupled with zeta potential. The morphological observation obtained by scanning electron microscopy and transmission electron microscopy provided clear indication that the immobile chitosan polymer formed a coating onto the Morinda citrifolia essential oils surface.

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The ability of a natural stabilizing and reducing agent on the synthesis of silver nanoparticles (Ag NPs) was explored using a rapid and single-pot biological reduction method using Nocardiopsis sp. GRG1 (KT235640) biomass. The UV-visible spectral analysis of Ag NPs was found to show a maximum absorption peak located at a wavelength position of ∼422 nm for initial conformation.

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Copper oxide nanoparticles (CuO NPs) were synthesized biologically using leaf extract of Camilla japonica. The typical UV-visible spectral peak of CuO NPs was observed at a wavelength of ∼290 nm, which confirmed their successful synthesis. From scanning electron microscope (SEM) and transmission electron microscope (TEM) analyses, the synthesized CuO NPs were found to possess spherical shape.

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The present study was designed to identify the potential bioactive compound from endophytic actinomycetes (EA) Nocardiopsis sp. GRG 2 (KT 235641) against selected extended spectrum beta lactamase (ESBL) producing Pseudomonas aeruginosa (P. aeruginosa) and Klebsiella pneumoniae (K.

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The aim of the current study is to identify bioactive compound from marine endophytic actinomycetes (MEA) isolated from Gulf of Mannar region, Southeast coast of India. Among the isolated actinomycetes, strain GRG 4 exhibited excellent ability to inhibit isolated colistin resistant (CR) Pseudomonas aeruginosa (P. aeruginosa) and Klebsiella pneumoniae (K.

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The accelerative outgrowth of extended spectrum β-lactamases (ESBLs) producing Escherichia coli (E. coli) and Proteus mirabilis (P. mirabilis) was mainly due to incessant relentless influence of antibiotics thereby increasing incidence and death rate which was obvious from the survey of ESBLs producing bacteria related health problem.

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The multidrug resistant Gram negative bacteria (MDRGNB) is an emerging burden and now represents a daily challenge for the management of antimicrobial therapy in healthcare settings. The present study was aimed to detect the prevalence of TEM and CTX-M type genes from GNB on urinary tract infection (UTIs). The ciprofloxacin resistant uropathogens were detected by HEXA UTI 5 disc diffusion method.

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Urinary tract infections (UTIs) are diverse public health complication and caused by range of pathogens, however mostly Gram negative bacteria cause significant life threatening risks to different populations. The prevalence rate and antimicrobial resistance among the Gram negative uropathogens alarmed significantly heighten the economic burden of these infections. In this study, we investigated the antibiofilm efficiency of Pyrrolo [1,2-a] pyrazine-1,4-dione,hexahydro-3-(2-methylpropyl) extracted from endophytic actinomycetes Nocardiopsis sp.

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Our study is to evaluate the potential bioactive compound of sp. GRG1 (KT235640) and its antibacterial activity against multi drug resistant strains (MDRS) on urinary tract infections (UTIs). Two brown algae samples were collected and were subjected to isolation of endophytic actinomycetes.

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