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  1. Article: Carbon and Cellulose-Based Nanoparticle-Reinforced Polymer Nanocomposites: A Critical Review.

    Yuvaraj, Gopal / Ramesh, Manickam / Rajeshkumar, Lakshminarasimhan

    Nanomaterials (Basel, Switzerland)

    2023  Volume 13, Issue 11

    Abstract: Nanomaterials are currently used for different applications in several fields. Bringing the measurements of a material down to nanoscale size makes vital contributions to the improvement of the characteristics of materials. The polymer composites acquire ...

    Abstract Nanomaterials are currently used for different applications in several fields. Bringing the measurements of a material down to nanoscale size makes vital contributions to the improvement of the characteristics of materials. The polymer composites acquire various properties when added to nanoparticles, increasing characteristics such as bonding strength, physical property, fire retardance, energy storage capacity, etc. The objective of this review was to validate the major functionality of the carbon and cellulose-based nanoparticle-filled polymer nanocomposites (PNC), which include fabricating procedures, fundamental structural properties, characterization, morphological properties, and their applications. Subsequently, this review includes arrangement of nanoparticles, their influence, and the factors necessary to attain the required size, shape, and properties of the PNCs.
    Language English
    Publishing date 2023-06-05
    Publishing country Switzerland
    Document type Journal Article ; Review
    ZDB-ID 2662255-5
    ISSN 2079-4991
    ISSN 2079-4991
    DOI 10.3390/nano13111803
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Nanotechnology-Enabled Biosensors: A Review of Fundamentals, Design Principles, Materials, and Applications.

    Ramesh, Manickam / Janani, Ravichandran / Deepa, Chinnaiyan / Rajeshkumar, Lakshminarasimhan

    Biosensors

    2022  Volume 13, Issue 1

    Abstract: Biosensors are modern engineering tools that can be widely used for various technological applications. In the recent past, biosensors have been widely used in a broad application spectrum including industrial process control, the military, environmental ...

    Abstract Biosensors are modern engineering tools that can be widely used for various technological applications. In the recent past, biosensors have been widely used in a broad application spectrum including industrial process control, the military, environmental monitoring, health care, microbiology, and food quality control. Biosensors are also used specifically for monitoring environmental pollution, detecting toxic elements' presence, the presence of bio-hazardous viruses or bacteria in organic matter, and biomolecule detection in clinical diagnostics. Moreover, deep medical applications such as well-being monitoring, chronic disease treatment, and in vitro medical examination studies such as the screening of infectious diseases for early detection. The scope for expanding the use of biosensors is very high owing to their inherent advantages such as ease of use, scalability, and simple manufacturing process. Biosensor technology is more prevalent as a large-scale, low cost, and enhanced technology in the modern medical field. Integration of nanotechnology with biosensors has shown the development path for the novel sensing mechanisms and biosensors as they enhance the performance and sensing ability of the currently used biosensors. Nanoscale dimensional integration promotes the formulation of biosensors with simple and rapid detection of molecules along with the detection of single biomolecules where they can also be evaluated and analyzed critically. Nanomaterials are used for the manufacturing of nano-biosensors and the nanomaterials commonly used include nanoparticles, nanowires, carbon nanotubes (CNTs), nanorods, and quantum dots (QDs). Nanomaterials possess various advantages such as color tunability, high detection sensitivity, a large surface area, high carrier capacity, high stability, and high thermal and electrical conductivity. The current review focuses on nanotechnology-enabled biosensors, their fundamentals, and architectural design. The review also expands the view on the materials used for fabricating biosensors and the probable applications of nanotechnology-enabled biosensors.
    MeSH term(s) Nanotubes, Carbon ; Nanotechnology/methods ; Nanostructures ; Nanoparticles ; Nanowires ; Biosensing Techniques/methods
    Chemical Substances Nanotubes, Carbon
    Language English
    Publishing date 2022-12-27
    Publishing country Switzerland
    Document type Journal Article ; Review
    ZDB-ID 2662125-3
    ISSN 2079-6374 ; 2079-6374
    ISSN (online) 2079-6374
    ISSN 2079-6374
    DOI 10.3390/bios13010040
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Molecular characterization of potent antibacterial compound 4-(3-methylazetidin-1-yl)pentan-2-ol from Calophyllum inophyllum seed oil

    Anjukam, Elamaran / Ramesh, Manickam / Rajalakshmi, Arumugam / Kavitha, Kuppuswamy / Prakash, Mani / Suresh, Gopal / Puvanakrishnan, Rengarajulu / Ramesh, Balasubramanian

    Biocatalysis and Agricultural Biotechnology. 2023 Jan., v. 47 p.102617-

    2023  

    Abstract: Calophyllum inophyllum (Calophyllaceae) has wide applications in traditional folk medicine. The methanol extract of C. inophyllum exhibited good antibacterial activities (17 ± 1.73 to 24 ± 1.15 mm) against Bacillus subtilis, Staphylococcus aureus, ... ...

    Abstract Calophyllum inophyllum (Calophyllaceae) has wide applications in traditional folk medicine. The methanol extract of C. inophyllum exhibited good antibacterial activities (17 ± 1.73 to 24 ± 1.15 mm) against Bacillus subtilis, Staphylococcus aureus, Escherichia coli, Klebsiella pneumoniae, and Pseudomonas aeruginosa. The bioactive constituents of this seed oil were purified by thin-layer chromatography (TLC) and column chromatography and characterized by gas chromatography-mass spectrometry (GC-MS). The compounds such as Benzene, 1-bromo-4- (1, 3-dichloropropyl), furan −2 –carboxaldehyde 5 – (3-nitrophenoxy) and (4 – iodopyrazol-1-yl) acetonitrile were predominant (28.14%) followed by 2-ethylacridine, 2-methyl-7-phenylindole, 5-methyl-2-phenylindolizine (9.18%) and then by E−11-hexadecenal, Cis-9-hexadecenal and 9, 17-octadecadienal (z) (8.90%). Further, preparative high performance liquid chromatography (HPLC) and spectroscopic studies such as Fourier-transform infrared spectroscopy (FTIR) and Nuclear magnetic resonance (NMR) combined with CSEARCH spectral similarity search demonstrated that the bioactive antibacterial compound in the active fraction is 4- (3-methylazetidin-1-yl) pentan-2-ol.
    Keywords Bacillus subtilis ; Calophyllum inophyllum ; Escherichia coli ; Fourier transform infrared spectroscopy ; Klebsiella pneumoniae ; Pseudomonas aeruginosa ; Staphylococcus aureus ; agricultural biotechnology ; antibiotics ; benzene ; biocatalysis ; furans ; gas chromatography-mass spectrometry ; high performance liquid chromatography ; methanol ; nuclear magnetic resonance spectroscopy ; seed oils ; thin layer chromatography ; traditional medicine ; Seed oil ; Anti-bacterial ; Phytochemicals ; GC-MS ; FTIR ; NMR
    Language English
    Dates of publication 2023-01
    Publishing place Elsevier Ltd
    Document type Article ; Online
    ZDB-ID 2642052-1
    ISSN 1878-8181
    ISSN 1878-8181
    DOI 10.1016/j.bcab.2023.102617
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  4. Article: Production and characterization of naturally occurring antibacterial magnetite nanoparticles from magnetotactic Bacillus sp. MTB17

    Rajalakshmi, Arumugam / Ramesh, Manickam / Divya, Ellappan / Kavitha, Kuppuswamy / Puvanakrishnan, Rengarajulu / Ramesh, Balasubramanian

    Journal of applied microbiology. 2022 Apr., v. 132, no. 4

    2022  

    Abstract: AIMS: This study envisaged the isolation and characterization of magnetite nanoparticles (MNPs) from magnetotactic bacteria (MTB) and the evaluation of their antibacterial efficacy. METHODS AND RESULTS: MNPs were extracted from 20 motile but ... ...

    Abstract AIMS: This study envisaged the isolation and characterization of magnetite nanoparticles (MNPs) from magnetotactic bacteria (MTB) and the evaluation of their antibacterial efficacy. METHODS AND RESULTS: MNPs were extracted from 20 motile but morphologically different MTB, and they were subjected to antibacterial activity assay. These MNPs were found to be highly effective against Vibrio cholerae. MTB17 was considered as the potent MTB strain based on the antibacterial activity. The MNPs of MTB17 were isolated and validated by UV‐Visible spectroscopy, particle size analysis, FTIR analysis, and PXRD. CONCLUSIONS: Isolation and characterization of ~85 nm MNPs from MTB is reported, and it is highly active against all the gram‐positive and gram‐negative strains tested. SIGNIFICANCE AND IMPACT OF THE STUDY: This study focuses on a novel use of biogenic magnetite MNPs as an antibacterial agent, which can be further explored using in vivo studies.
    Keywords Bacillus (bacteria) ; Vibrio cholerae ; antibacterial properties ; antibiotics ; magnetite ; particle size ; ultraviolet-visible spectroscopy
    Language English
    Dates of publication 2022-04
    Size p. 2683-2693.
    Publishing place John Wiley & Sons, Ltd
    Document type Article
    Note JOURNAL ARTICLE
    ZDB-ID 1358023-1
    ISSN 1365-2672 ; 1364-5072
    ISSN (online) 1365-2672
    ISSN 1364-5072
    DOI 10.1111/jam.15395
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  5. Article: A novel colorimetric technique for estimating iron in magnetosomes of magnetotactic bacteria based on linear regression

    Rajalakshmi, Arumugam / Anjukam, Elamaran / Ramesh, Manickam / Kavitha, Kuppuswamy / Puvanakrishnan, Rengarajulu / Ramesh, Balasubramanian

    Archives of microbiology. 2022 May, v. 204, no. 5

    2022  

    Abstract: Magnetotactic bacteria (MTB) use iron from their habitat to create magnetosomes, a unique organelle required for magnetotaxis. Due to a lack of cost-effective assay methods for estimating iron in magnetosomes, research on MTB and iron-rich magnetosomes ... ...

    Abstract Magnetotactic bacteria (MTB) use iron from their habitat to create magnetosomes, a unique organelle required for magnetotaxis. Due to a lack of cost-effective assay methods for estimating iron in magnetosomes, research on MTB and iron-rich magnetosomes is limited. A systemized assay was established in this study to quantify iron in MTB using ferric citrate colorimetric estimation. With a statistically significant R² value of 0.9935, the iron concentration range and wavelength for iron estimation were optimized using linear regression. This colorimetric approach and the inductively coupled plasma optical emission spectrometry (ICP-OES) exhibited an excellent correlation R² value of 0.961 in the validatory correlative study of the iron concentration in the isolated magnetotactic bacterial strains. In large-scale screening studies, this less-expensive strategy could be advantageous.
    Keywords atomic absorption spectrometry ; citrates ; colorimetry ; cost effectiveness ; habitats ; iron ; magnetotaxis ; regression analysis ; wavelengths
    Language English
    Dates of publication 2022-05
    Size p. 282.
    Publishing place Springer Berlin Heidelberg
    Document type Article
    ZDB-ID 124824-8
    ISSN 1432-072X ; 0302-8933
    ISSN (online) 1432-072X
    ISSN 0302-8933
    DOI 10.1007/s00203-022-02901-1
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  6. Article ; Online: A novel colorimetric technique for estimating iron in magnetosomes of magnetotactic bacteria based on linear regression.

    Rajalakshmi, Arumugam / Anjukam, Elamaran / Ramesh, Manickam / Kavitha, Kuppuswamy / Puvanakrishnan, Rengarajulu / Ramesh, Balasubramanian

    Archives of microbiology

    2022  Volume 204, Issue 5, Page(s) 282

    Abstract: Magnetotactic bacteria (MTB) use iron from their habitat to create magnetosomes, a unique organelle required for magnetotaxis. Due to a lack of cost-effective assay methods for estimating iron in magnetosomes, research on MTB and iron-rich magnetosomes ... ...

    Abstract Magnetotactic bacteria (MTB) use iron from their habitat to create magnetosomes, a unique organelle required for magnetotaxis. Due to a lack of cost-effective assay methods for estimating iron in magnetosomes, research on MTB and iron-rich magnetosomes is limited. A systemized assay was established in this study to quantify iron in MTB using ferric citrate colorimetric estimation. With a statistically significant R
    MeSH term(s) Colorimetry ; Ferrosoferric Oxide/analysis ; Gram-Negative Bacteria ; Iron ; Linear Models ; Magnetosomes/chemistry
    Chemical Substances Iron (E1UOL152H7) ; Ferrosoferric Oxide (XM0M87F357)
    Language English
    Publishing date 2022-04-26
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 124824-8
    ISSN 1432-072X ; 0302-8933
    ISSN (online) 1432-072X
    ISSN 0302-8933
    DOI 10.1007/s00203-022-02901-1
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  7. Article ; Online: A Critical Review on Wood-Based Polymer Composites: Processing, Properties, and Prospects.

    Ramesh, Manickam / Rajeshkumar, Lakshminarasimhan / Sasikala, Ganesan / Balaji, Devarajan / Saravanakumar, Arunachalam / Bhuvaneswari, Venkateswaran / Bhoopathi, Ramasamy

    Polymers

    2022  Volume 14, Issue 3

    Abstract: Waste recycling is one of the key aspects in current day studies to boost the country's circular economy. Recycling wood from construction and demolished structures and combining it with plastics forms wood-polymer composites (WPC) which have a very wide ...

    Abstract Waste recycling is one of the key aspects in current day studies to boost the country's circular economy. Recycling wood from construction and demolished structures and combining it with plastics forms wood-polymer composites (WPC) which have a very wide scope of usage. Such recycled composites have very low environmental impact in terms of abiotic potential, global warming potential, and greenhouse potential. Processing of WPCs can be easily done with predetermined strength values that correspond to its end application. Yet, the usage of conventional polymer composite manufacturing techniques such as injection molding and extrusion has very limited scope. Many rheological characterization techniques are being followed to evaluate the influence of formulation and process parameters over the quality of final WPCs. It will be very much interesting to carry out a review on the material formulation of WPCs and additives used. Manufacturing of wood composites can also be made by using bio-based adhesives such as lignin, tannin, and so on. Nuances in complete replacement of synthetic adhesives as bio-based adhesives are also discussed by various researchers which can be done only by complete understanding of formulating factors of bio-based adhesives. Wood composites play a significant role in many non-structural and structural applications such as construction, floorings, windows, and door panels. The current review focuses on the processing of WPCs along with additives such as wood flour and various properties of WPCs such as mechanical, structural, and morphological properties. Applications of wood-based composites in various sectors such as automotive, marine, defense, and structural applications are also highlighted in this review.
    Language English
    Publishing date 2022-01-31
    Publishing country Switzerland
    Document type Journal Article ; Review
    ZDB-ID 2527146-5
    ISSN 2073-4360 ; 2073-4360
    ISSN (online) 2073-4360
    ISSN 2073-4360
    DOI 10.3390/polym14030589
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  8. Article ; Online: 4a‐methyl‐dodecahydro‐1H-pyrrolo[3,4-b]quinoline-6‐one produced by Endophytic Fungi Aspergillus niger E12 obtained from Dodonaea viscosa Plant Leaves as a Novel Antibacterial Compound

    Ramesh, Manickam / Kavitha, Kuppuswamy / Rajalakshmi, Arumugam / Anjukam, Elamaran / Prabakaran, Vadivel / Prakash, Mani / Puvanakrishnan, Rengarajulu / Ramesh, Balasubramanian

    Appl Biochem Biotechnol. 2022 Nov., v. 194, no. 11 p.5132-5150

    2022  

    Abstract: Endophytic fungi were isolated from forty plant leaf samples from Gudiyam forest. The potent antibacterial strain Aspergillus niger E12 isolated from the plant Dodonaea viscosa showed maximal antibacterial activity against all the test organisms, viz., ... ...

    Abstract Endophytic fungi were isolated from forty plant leaf samples from Gudiyam forest. The potent antibacterial strain Aspergillus niger E12 isolated from the plant Dodonaea viscosa showed maximal antibacterial activity against all the test organisms, viz., Staphylococcus aureus, Bacillus coagulans, Escherichia coli, Klebsiella pneumoniae, and Pseudomonas aeruginosa. The production of the antibacterial compound was optimized using the yeast extract sucrose medium (2% YES) using response surface methodology (RSM). For the production, the optimal parameters were carbon/nitrogen (C:N) ratio, 9:1; temperature, 25 °C; pH, 5.7; incubation time, 240 h; and rpm, 30. A zone of inhibition of 19.33 mm was observed as maximal bioactivity against Pseudomonas aeruginosa. The antibacterial compound was purified by extraction with ethyl acetate, activity-guided fractionation, and preparative high-performance liquid chromatography (HPLC), gas chromatography-mass spectrometry (GC–MS), Fourier transform infrared (FTIR) spectroscopy, and nuclear magnetic resonance (NMR) studies showed that the Aspergillus niger E12 bioactive substance is 4a‐methyl‐dodecahydro‐1H-pyrrolo [3,4-b] quinoline-6‐one.
    Keywords Aspergillus niger ; Bacillus coagulans ; Dodonaea viscosa ; Escherichia coli ; Fourier transform infrared spectroscopy ; Klebsiella pneumoniae ; Pseudomonas aeruginosa ; Staphylococcus aureus ; antibacterial properties ; antibiotics ; bioactive compounds ; carbon ; endophytes ; ethyl acetate ; forests ; fractionation ; gas chromatography-mass spectrometry ; high performance liquid chromatography ; leaves ; nitrogen ; nuclear magnetic resonance spectroscopy ; pH ; response surface methodology ; sucrose ; temperature ; yeast extract
    Language English
    Dates of publication 2022-11
    Size p. 5132-5150.
    Publishing place Springer US
    Document type Article ; Online
    ZDB-ID 392344-7
    ISSN 0273-2289
    ISSN 0273-2289
    DOI 10.1007/s12010-022-03988-4
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  9. Article ; Online: Production and characterization of naturally occurring antibacterial magnetite nanoparticles from magnetotactic Bacillus sp. MTB17.

    Rajalakshmi, Arumugam / Ramesh, Manickam / Divya, Ellappan / Kavitha, Kuppuswamy / Puvanakrishnan, Rengarajulu / Ramesh, Balasubramanian

    Journal of applied microbiology

    2021  Volume 132, Issue 4, Page(s) 2683–2693

    Abstract: Aims: This study envisaged the isolation and characterization of magnetite nanoparticles (MNPs) from magnetotactic bacteria (MTB) and the evaluation of their antibacterial efficacy.: Methods and results: MNPs were extracted from 20 motile but ... ...

    Abstract Aims: This study envisaged the isolation and characterization of magnetite nanoparticles (MNPs) from magnetotactic bacteria (MTB) and the evaluation of their antibacterial efficacy.
    Methods and results: MNPs were extracted from 20 motile but morphologically different MTB, and they were subjected to antibacterial activity assay. These MNPs were found to be highly effective against Vibrio cholerae. MTB17 was considered as the potent MTB strain based on the antibacterial activity. The MNPs of MTB17 were isolated and validated by UV-Visible spectroscopy, particle size analysis, FTIR analysis, and PXRD.
    Conclusions: Isolation and characterization of ~85 nm MNPs from MTB is reported, and it is highly active against all the gram-positive and gram-negative strains tested.
    Significance and impact of the study: This study focuses on a novel use of biogenic magnetite MNPs as an antibacterial agent, which can be further explored using in vivo studies.
    MeSH term(s) Anti-Bacterial Agents/pharmacology ; Bacillus ; Gram-Negative Bacteria ; Magnetite Nanoparticles/chemistry ; Particle Size
    Chemical Substances Anti-Bacterial Agents ; Magnetite Nanoparticles
    Language English
    Publishing date 2021-12-13
    Publishing country England
    Document type Journal Article
    ZDB-ID 1358023-1
    ISSN 1365-2672 ; 1364-5072
    ISSN (online) 1365-2672
    ISSN 1364-5072
    DOI 10.1111/jam.15395
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  10. Article ; Online: 4a-methyl-dodecahydro-1H-pyrrolo[3,4-b]quinoline-6-one produced by Endophytic Fungi Aspergillus niger E12 obtained from Dodonaea viscosa Plant Leaves as a Novel Antibacterial Compound.

    Ramesh, Manickam / Kavitha, Kuppuswamy / Rajalakshmi, Arumugam / Anjukam, Elamaran / Prabakaran, Vadivel / Prakash, Mani / Puvanakrishnan, Rengarajulu / Ramesh, Balasubramanian

    Applied biochemistry and biotechnology

    2022  Volume 194, Issue 11, Page(s) 5132–5150

    Abstract: Endophytic fungi were isolated from forty plant leaf samples from Gudiyam forest. The potent antibacterial strain Aspergillus niger E12 isolated from the plant Dodonaea viscosa showed maximal antibacterial activity against all the test organisms, viz., ... ...

    Abstract Endophytic fungi were isolated from forty plant leaf samples from Gudiyam forest. The potent antibacterial strain Aspergillus niger E12 isolated from the plant Dodonaea viscosa showed maximal antibacterial activity against all the test organisms, viz., Staphylococcus aureus, Bacillus coagulans, Escherichia coli, Klebsiella pneumoniae, and Pseudomonas aeruginosa. The production of the antibacterial compound was optimized using the yeast extract sucrose medium (2% YES) using response surface methodology (RSM). For the production, the optimal parameters were carbon/nitrogen (C:N) ratio, 9:1; temperature, 25 °C; pH, 5.7; incubation time, 240 h; and rpm, 30. A zone of inhibition of 19.33 mm was observed as maximal bioactivity against Pseudomonas aeruginosa. The antibacterial compound was purified by extraction with ethyl acetate, activity-guided fractionation, and preparative high-performance liquid chromatography (HPLC), gas chromatography-mass spectrometry (GC-MS), Fourier transform infrared (FTIR) spectroscopy, and nuclear magnetic resonance (NMR) studies showed that the Aspergillus niger E12 bioactive substance is 4a-methyl-dodecahydro-1H-pyrrolo [3,4-b] quinoline-6-one.
    MeSH term(s) Anti-Bacterial Agents/chemistry ; Aspergillus niger ; Fungi ; Pseudomonas aeruginosa ; Plant Leaves/microbiology ; Escherichia coli ; Quinolines ; Nitrogen ; Carbon ; Sucrose ; Microbial Sensitivity Tests
    Chemical Substances Anti-Bacterial Agents ; Quinolines ; Nitrogen (N762921K75) ; Carbon (7440-44-0) ; Sucrose (57-50-1)
    Language English
    Publishing date 2022-06-13
    Publishing country United States
    Document type Journal Article
    ZDB-ID 392344-7
    ISSN 1559-0291 ; 0273-2289
    ISSN (online) 1559-0291
    ISSN 0273-2289
    DOI 10.1007/s12010-022-03988-4
    Database MEDical Literature Analysis and Retrieval System OnLINE

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