Wyniki wyszukiwania

1

Tribocorrosion of steel - steel couples in the presence of silver nanoparticles

100%

Kytsya A., Vynar V., Vasyliv C., Bazylyak L., Gushchak R.

Motrol. Motoryzacja i Energetyka Rolnictwa

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2017

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tom 19

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nr 2

2

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Characterization and biosynthesis of silver nanoparticles using a fungus Aspergillus niger

75%

Ninganagouda S., Rathod V., Singh D.

International Letters of Natural Sciences

|

2014

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tom 10

An attractive possibility of green nanotechnology is to use microorganisms in the synthesis of silver nanoparticles. Recently, the biosynthesis especially from fungi has emerged as a novel method for the synthesis of silver nanoparticles. Nanoparticles are considered as building blocks of Nanotechnology. In the present work we have screened fungi for the extracellular production of silver nanoparticles. Aspergillus sps, Rhizopus sps, Fusarium sp. and Penicillium sp. were the isolates screened and subjected to silver nanoparticles production. Of the tested isolates, the fungus Aspergillus sp. showed maximum absorbance at 416 nm which is an indication of Silver nanoparticles production. Further characterization was made by TEM which revealed the shape to be spherical and size ranged between 20-55 nm, EDS showed the presence of elemental silver at 3kev, FTIR spectrum showed the different functional groups, XRD spectrum showed the crystalline nature of the particles and AFM revealed three dimensional structures of the nanoparticles. Of all kinds of nanoparticles silver nanoparticles show great promise in terms of biomedical applications as they exhibit different biomedical activities.

3

Studies on biosynthesis of silver nanoparticles using Rhizopus sp. and its antibacterial efficacy on E. coli MDR strains

75%

Hiremath J., Rathod V., Ninganagouda S., Singh D., Prema K.

International Letters of Natural Sciences

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2014

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tom 18

Nanotechnology is a field that is burgeoning day by day, making an impact in all spheres of human life. Biological methods of synthesis have paved way for the “greener synthesis” of nanoparticles and these have proven to be better methods due to slower kinetics, they offer better manipulation and control over crystal growth and their stabilization. In this context we have investigated extracellular biosynthesis of silver nanoparticles (AgNPs) using cell-free extract of Rhizopus spp.. Formation of AgNPs was indicated by the change in the colour of the cellfree extract from yellow to dark brown under static condition after 48 hrs of incubation. Characterization of AgNPs was carried out by UV-Vis Spectroscopy which gave sharp plasmon resonance peak at 429 nm corresponding to spherical shaped nanoparticles. Transmission electron microscopy (TEM) micrograph showed formation of well-dispersed AgNPs in the range of 25-50 nm. Scanning electron microscopy (SEM) showed the particles to be uniformly dispersed without agglomeration with smooth morphology. EDS showed the presence of elemental silver at 3kev. X-ray diffraction (XRD)-spectrum of the AgNPs exhibited 2θ¸ values corresponding to nanocrystal. These biosynthesized AgNPs were used to study their antimicrobial activity against Multi-drug resistant (MDR) E. coli strains, by Agar diffusion method. Zone of inhibition was measured. Synthesis of nanosized particles with antibacterial properties, which are called "nanoantibiotics", is of great interest in the development of new pharmaceutical products.

4

Photocatalytic degradation of ampicillin using silver nanoparticles biosynthesised by Pleurotus ostreatus

75%

Jassal P. S., Khajuria R., Sharma R., Debnath P., Verma S., Johnson A., Kumar S.

BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology

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2020

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tom 101

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nr 1

5

Silver tolerance and silver nanoparticle biosynthesis by Neoscytalidium novaehollandae and Trichoderma inhamatum

75%

Hussein M. A.

European Journal of Biological Research

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2016

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tom 06

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nr 1

6

Influence of silver and copper nanoparticles on Staphylococcus aureus biofilm formation

75%

Widynska E., Zajac A., Jaworski S., Strojny B.

Annals of Warsaw University of Life Sciences - SGGW. Animal Science

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2018

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tom 57[2]

7

Green synthesis of silver nanoparticles with antimicrobial activity using an extract of Drosera capensis

75%

Banasiuk R., Krychowiak M., Matuszewska M., Narajczyk M., Krolicka A.

BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology

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2015

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tom 96

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nr 1

8

A study on extracellular synthesis of silver nanoparticles from endophytic fungi, isolated from ethanomedicinal plants Curcuma longa and Catharanthus roseus

75%

Singh D., Rathod V., Singh A. K., Haq M. U., Mathew J., Kulkarni P.

International Letters of Natural Sciences

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2016

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tom 57

Biological method is considered as eco-friendly and reliable process for the synthesis of silver nanoparticles (AgNps) in the field of nanotechnology due to its tremendous applications in various fields. In this study we have isolated a total of twelve endophytic fungi from leaves of Curcuma longa (turmeric) and Catharanthus roseus out of which six endophytic fungi showed their ability to synthesized AgNps from silver nitrate (AgNO3) solution which splits into a positive silver ion (Ag+) and a negative nitrate ion (NO3 -) in order to turn the silver ions into solid silver (Agº). Of the six positive endophytic fungi VRD2 showed good and encouraging results and was identified as Penicillium spinulosum VRD2. UV-Visible Spectroscopy confirms the AgNps showing maximum peak at 425nm implying the bioreduction of AgNO3. Transmission Electron Microscopy (TEM) revealed the particle are spherical and well dispersed without agglomeration size ranging from 25- 30nm.

9

Silver nanoparticles production mediated by natural tetraploid Trifolium pratense L.: Characterization and potential biological activity

75%

Karahan H. A., Colgecen H.

Acta Agrobotanica

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2023

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tom 76

10

Improved transformation of Agrobacterium assisted by silver nanoparticle

75%

Benny A., Alex S., Soni K. B., Anith K. N., Kiran A. G., Viji M. M.

BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology

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2022

|

tom 103

|

nr 3

11

In silico and in vitro cytotoxic effect of prodigiosin-conjugated silver nanoparticles on liver cancer cells (HepG2)

63%

El-Batal A. I., El-Hendawy H. H., Faraag A. H. I.

BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology

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2017

|

tom 98

|

nr 3

12

Synthesis of quercetin-functionalized silver nanoparticles by rapid one-pot approach

63%

Pandian S. R. K., Kunjiappan S., Ravishankar V., Sundarapandian V.

BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology

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2021

|

tom 102

|

nr 1

13

Involvement of ethylene synthetic inhibitors in regulating the senescence of cut carnations through membrane integrity maintenance

63%

Hassan F., Ali E., Mazrou R.

Journal of Horticultural Research

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2020

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tom 28

|

nr 1

14

First report of Pythium aphanidermatum infecting tomato in Egypt and its control using biogenic silver nanoparticles

63%

Elshahawy I., Abouelnasr H. M., Lashin S. M., Darwesh O. M.

Journal of Plant Protection Research

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2018

|

tom 58

|

nr 2

In August 2016, tomato plants grown during a hot, wet summer with heavy soil flooding, displaying symptoms of wilting, dead plant, root rot with crown and stem rot, at Beni Suef and Fayoum governorates were examined. A number of 16 fungal isolates were isolated from tomato plants displaying the above symptoms. These isolates were classified as belonging to six species, namely: Alternaria solani, Chaetomium globosum, Fusarium solani, Fusarium oxysporum, Pythium spp. and Rhizoctonia solani. Isolates of Pythium spp. were prevalent and were found to be more pathogenic than the other fungal isolates. This species causes damping-off, root rot, sudden death, stem rot and fruit rot. The pathogen was identified as Pythium aphanidermatum based on morphological, cultural, and molecular characteristics. Biogenic silver nanoparticles (AgNPs) were produced using the F. oxysporum strain and characterized by transmission electron microscopy (TEM). The size of these spherical particles ranged from 10 to 30 nm. In vitro, biogenic AgNPs showed antifungal activity against P. aphanidermatum. In greenhouse and field experiments, AgNPs treatment significantly reduced the incidence of dead tomato plants due to root rot caused by P. aphanidermatum compared to the control. All of the investigated treatments were effective and the treatment of root dipping plus soil drenching was the most effective. To the best of our knowledge, this study describes P. aphanidermatum on tomato in Egypt for the first time. Also, biogenic AgNPs could be used for controlling root rot disease caused by this pathogen.

15

The effects of exposure of ide's larvae and juvenile Leuciscus idus (L.) to silver nanoparticles via the digestive tract

63%

Chojnacki M., Sliwinski J.

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2013

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tom 31

|

nr 4

16

Green synthesis of silver nanoparticles by using aqueous mint (Mentha piperita) and cabbage (Brassica oleracea var. capitata) extracts and their antibacterial activity

51%

Sosnowska M., Kutwin M., Adamiak A., Gawin K., Bugajska Z., Daniluk K.

Annals of Warsaw University of Life Sciences - SGGW. Animal Science

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2017

|

tom 56[1]

Green synthesis of silver nanoparticles by using aqueous mint (Mentha piperita) and cabbage (Brassica oleracea var.capitata) extracts and their antibacterial activity. The objective of this study was the synthesis of silver nanoparticles (Ag-NP) using leaves of mint and cabbage extracts as the reducing and stabilising agents. The presence of nanoparticles was initially confirmed by the obtained colour and next by transmission electron microscope (TEM). TEM analysis of obtained Ag-NP indicated that their size ranged 5-50 nm for mint and 10-150 nm for cabbage. The antibacterial activity of nanoparticles against pathogenic strains Escherichia coli, Staphylococcus aureus and Salmonella enterica were assessed by evaluation of metabolic activity, using the PrestoBlue and XTT test. The higher inhibition of bacterial viability was observed against Gram negative (E. coli, S. enterica) than Gram positive (S. aureus) bacteria.

17

Bakteriobójcza aktywność koloidów srebra stabilizowanych hydrolizatami skrobiowymi oraz ich wpływ na wytrzymałość zapraw cementowych

51%

Sybis M., Konowal E., Modrzejewska-Sikorska A.

Acta Scientiarum Polonorum. Architectura

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2017

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tom 16

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nr 4

W artykule przeanalizowano koloidy srebra stabilizowane hydrolizatami skrobiowymi pod kątem właściwości bakteriobójczych, określając również ich wielkość oraz kształt. Zbadano także właściwości wytrzymałościowe zapraw cementowych z domieszkami analizowanych hydrolizatów skrobiowych, lignosulfonianów sodowych i ich połączenia z nanosrebrem. Koloidy srebra poddano analizie spektrofotometrycznej UV-vis w celu stwierdzenia obecności nanostruktur srebra. Określono również rozkład wielkości nanocząstek metodą nieinwazyjnego wstecznego rozproszenia światła oraz ich kształt za pomocą mikroskopii elektronowej (TEM). Otrzymane koloidy srebra podczas wykonania prób bakteriobójczych wykazały silną odporność na działanie tzw. bakterii bytowych. Połączenie wymienionych właściwości nanosrebra z właściwościami uplastyczniającymi plastyfikatorów daje możliwość wytwarzania zapraw cementowych i betonów odpornych na działanie mikroorganizmów o zwiększonej urabialności i wytrzymałości na ściskanie.

18

Is the NMDA receptor involved in neurotoxicity of pvp-coated silver nanoparticles? Study on primary cultures of cerebellar granule cells

51%

Zieminska E., Stafiej A., Struzynska L.

Acta Neurobiologiae Experimentalis

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2013

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tom 73

|

nr 1

Silver nanoparticles (NAg) possess antibacterial properties thus are widely used in many applications in medicine, life sciences and biotechnology. Nanoparticles can be found in vertebrate brain, but little is known about their neurotoxicity. The aim of this study was to investigate how NAg can contribute to neuronal cell death. In the study primary cultures of rat cerebellar granule cells (CGC) were used. We tested hypothesis concerning the role of glutamatergic NMDA receptors in NAg-evoked neurotoxicity. In our study changes in intracellular calcium (Ca2+) homeostasis, uptake of 45Ca2+, reactive oxygen species (ROS) production, mitochondrial membrane potential and cells viability were investigated. We used commercially available 0.2% polyvinylpyrrolidone (PVP)-coated NAg <100 nm. To avoid sedimentation and agglomeration, before application to the CGC culture, NAg were sonicated with fetal calf serum. NAg were applied in concentration 2.5–75 µg/ml for 10, 30 min or 24 h, depending on experiment. As a pharmacological tool 0.5 µM MK801, a noncompetitive inhibitor of NMDA receptor, was used. After 10 min incubation in the presence of 25–75 µg/ ml NAg dose dependent increase of 45Ca2+ concentration was observed in neurons. This increase was comparable to that evoked by 100 µM glutamate and was completely abolished by MK801. Using fluorescent intracellular calcium indicator fluo3 we observed increase in intracellular calcium level by 200% compared to control, which was partially diminished by MK801. ROS production was measured using fluorescent dye DCF. After 30 min incubation with 75 µg/ml NAg the increase by about 35% over control level was observed and application of MK801 reduced it significantly. Changes in mitochondrial membrane potential were determined using rhodamine (R123). We observed significant decrease in mitochondrial potential during 30 min incubation with different concentrations of NAg and also in this case administration of MK801 was protective. Cells viability was assessed after 24 h incubation with NAg µg/ml alone or together with MK801. Application of MK801 increased neuronal survival from 50% up to 80%. Our results show that excitotoxicity via activation of NMDA receptor, followed by calcium imbalance, destabilization of mitochondrial function and ROS production, seems to be important mechanism involved in neurotoxicity evoked by NAg in cultured neurons. Supported by grant NN401619938.

19

Biogenic silver nanoparticles from Trichodesma indicum aqueous leaf extract against Mythimna separata and evaluation of its larvicidal efficacy

51%

Buhroo A. A., Nisa G., Asrafuzzaman S., Prasad R., Rasheed R., Bhattacharyya A.

Journal of Plant Protection Research

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2017

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tom 57

|

nr 2

Th e present exploration is focused on the bio-fabrication of silver nanoparticles (Ag NPs) using Trichodesma indicum aqueous leaf extract as a reducing agent. Th e synthesized Ag NPs were productively characterized by UV-vis spectroscopy, XRD, and TEM studies. Th e photosynthesis of Ag NPs was done at room temperature for 24 h and at 60°C. Th e green synthesis of spherical-shaped Ag NPs bio-fabricated from T. indicum with a face centred cubic structure showed average particle sizes of 20–50 nm, which is inconsistent with the particle size calculated by the XRD Scherer equation and TEM analysis. We further explored the larvicidal effi cacy of biosynthesized Ag NPs with leaf extracts of T. indicum against Mythimna separata. Th e results showed that Ag NPs (20–50 nm) of T. indicum possess good larvicidal activity against M. separata with an LC50 of 500 ppm. Th us, we can advocate that Ag NPs of 20–50 nm size extracted from T. indicum may be considered in the pest management programme of M. separata in future.

20

Can silver nanoparticles affect the mineral content, structure and mechanical properties of chicken embryo bones?

51%

Sikorska J., Szmidt M., Sawosz E., Niemiec T., Grodzik M., Chwalibog A.

Journal of Animal and Feed Sciences

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2010

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tom 19

|

nr 2

286-291

Biomedical application of silver nanoparticles has recently gained much attention. In this study, we investigated whether hydrocolloids of silver nanoparticles (nano-Ag) are deposited in chicken bones during embryogenesis and to what extent they can affect biochemical characteristics, mineral content, structure, and mechanical properties of bones. Hydrocolloids (0.3 ml), containing 50 ppm of nano-Ag, were injected in ovo prior to incubation of eggs. After 20 days of incubation, blood and thigh bones were isolated and analysed. Nano-Ag was deposited in embryo thigh bones, but did not affect the structure or mechanical properties of the bone. There was no effect of nano-Ag on the selected biochemical indices, but there was a tendency towards increasing mineral content, indicating that nanoparticles may influence bone mineralization. Considering that nano-Ag is absorbed by the embryo skeleton without affecting bone properties, these particles might be a good candidate for carriers of micronutrients or drugs into bones.

Ograniczanie wyników

Tribocorrosion of steel - steel couples in the presence of silver nanoparticles

Characterization and biosynthesis of silver nanoparticles using a fungus Aspergillus niger

Studies on biosynthesis of silver nanoparticles using Rhizopus sp. and its antibacterial efficacy on E. coli MDR strains

Photocatalytic degradation of ampicillin using silver nanoparticles biosynthesised by Pleurotus ostreatus

Silver tolerance and silver nanoparticle biosynthesis by Neoscytalidium novaehollandae and Trichoderma inhamatum

Influence of silver and copper nanoparticles on Staphylococcus aureus biofilm formation

Green synthesis of silver nanoparticles with antimicrobial activity using an extract of Drosera capensis

A study on extracellular synthesis of silver nanoparticles from endophytic fungi, isolated from ethanomedicinal plants Curcuma longa and Catharanthus roseus

Silver nanoparticles production mediated by natural tetraploid Trifolium pratense L.: Characterization and potential biological activity

Improved transformation of Agrobacterium assisted by silver nanoparticle

In silico and in vitro cytotoxic effect of prodigiosin-conjugated silver nanoparticles on liver cancer cells (HepG2)

Synthesis of quercetin-functionalized silver nanoparticles by rapid one-pot approach

Involvement of ethylene synthetic inhibitors in regulating the senescence of cut carnations through membrane integrity maintenance

First report of Pythium aphanidermatum infecting tomato in Egypt and its control using biogenic silver nanoparticles

The effects of exposure of ide's larvae and juvenile Leuciscus idus (L.) to silver nanoparticles via the digestive tract

Green synthesis of silver nanoparticles by using aqueous mint (Mentha piperita) and cabbage (Brassica oleracea var. capitata) extracts and their antibacterial activity

Bakteriobójcza aktywność koloidów srebra stabilizowanych hydrolizatami skrobiowymi oraz ich wpływ na wytrzymałość zapraw cementowych

Is the NMDA receptor involved in neurotoxicity of pvp-coated silver nanoparticles? Study on primary cultures of cerebellar granule cells

Biogenic silver nanoparticles from Trichodesma indicum aqueous leaf extract against Mythimna separata and evaluation of its larvicidal efficacy

Can silver nanoparticles affect the mineral content, structure and mechanical properties of chicken embryo bones?