scholarly journals Silver Nanoparticles and Silver Ions Differentially Affect the Phytohormone Balance and Yield in Wheat

Agriculture ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 729
Author(s):  
Ewa Pociecha ◽  
Anna Gorczyca ◽  
Michał Dziurka ◽  
Ewelina Matras ◽  
Magdalena Oćwieja
Keyword(s):  
Silver Nanoparticles ◽  
Photosystem Ii ◽  
Spring Wheat ◽  
Growth Promotion ◽  
Wheat Yield ◽  
Silver Ions ◽  
Considerable Improvement ◽  
Ionic Form ◽  
Final Yield ◽  
Average Size

This study aimed to examine the hypothesis that silver nanoparticles (AgNPs) and silver ions might induce specific changes and thereby affect plant development and final yield. The experiment was performed on spring wheat, cultured hydroponically with two types of negatively charged AgNPs of an average size of 13–15 nm and silver ions for 14 days and then transplanted to pots with soil. Our results indicated that treatment with the AgNPs stabilized by specific compounds resulted in growth promotion and a reduced number of days to flowering, while that with the ionic form of Ag only caused greater growth in height without influencing the time to heading. Accelerated flowering was caused by changes in phytohormone balance, with GA6 found to be especially favorable. Nanoparticles and silver ions affected the function of photosystem II and the transport and partitioning of assimilates. Increases in the transport form of sugars such as sucrose, raffinose and sorbitol were associated with a considerable improvement in wheat yield, especially in the case of plants treated with the nanoparticle forms, which were more stable and resistant to oxidative dissolution.

Phytochemical Synthesis of Silver Nanoparticles Using Anthemis Nobilis Extract and Its Antibacterial Activity

2020 ◽  
Vol 234 (3) ◽  
pp. 531-540
Author(s):  
Saba Ghamipoor ◽  
Faeze Fayyazi ◽  
Saeed Bahadorikhalili
Keyword(s):  
Silver Nanoparticles ◽  
Antibacterial Activity ◽  
Green Synthesis ◽  
Nitrate Solution ◽  
Synthesis Method ◽  
Silver Ions ◽  
Good Alternative ◽  
Ft Ir ◽  
Average Size ◽  
Physical And Chemical

AbstractIn this work, green synthesis of silver nanoparticles is described by phytochemical reducing silver nitrate aqueous solution using Anthemis nobilis. For this purpose, Anthemis nobilis extract was used for the synthesis of silver nanoparticles as both surfactant and reducing agent. Green synthesis method is a good alternative to physical and chemical methods, since it is fast, simple, environmentally-friendly and economic. The produced nanoparticles are identified using FE-SEM, EDX, and FT-IR and Uv/Vis techniques. Formation of silver nanoparticles is verified in 430–420 nm range. Reduction of silver ions by hydroxyl functional group is also confirmed by FT-IR device. EDX device confirms the presence of a peak for Ag element without any impurity peak. Silver nanoparticles are identified by FE-SEM device and found to have average size between 17 and 42 nm. Also, the antibacterial activity of the synthesized nanoparticles is compared with that of staphyloccusaureus and pseudomonasa aeruginosa and the maximum inhibitory activity against the bacteria is obtained using 1 mM nitrate solution.

scholarly journals Bioavailability of silver nanoparticles and ions: from a chemical and biochemical perspective

2013 ◽  
Vol 10 (87) ◽  
pp. 20130396 ◽  
Author(s):  
Renata Behra ◽  
Laura Sigg ◽  
Martin J. D. Clift ◽  
Fabian Herzog ◽  
Matteo Minghetti ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Antimicrobial Properties ◽  
Silver Ions ◽  
Metallic Silver ◽  
Medical Applications ◽  
Ionic Form ◽  
Biological Impact ◽  
Engineered Nanomaterial ◽  
Silver Nps ◽  
Biological Organisms

Owing to their antimicrobial properties, silver nanoparticles (NPs) are the most commonly used engineered nanomaterial for use in a wide array of consumer and medical applications. Many discussions are currently ongoing as to whether or not exposure of silver NPs to the ecosystem (i.e. plants and animals) may be conceived as harmful or not. Metallic silver, if released into the environment, can undergo chemical and biochemical conversion which strongly influence its availability towards any biological system. During this process, in the presence of moisture, silver can be oxidized resulting in the release of silver ions. To date, it is still debatable as to whether any biological impact of nanosized silver is relative to either its size, or to its ionic constitution. The aim of this review therefore is to provide a comprehensive, interdisciplinary overview—for biologists, chemists, toxicologists as well as physicists—regarding the production of silver NPs, its (as well as in their ionic form) chemical and biochemical behaviours towards/within a multitude of relative and realistic biological environments and also how such interactions may be correlated across a plethora of different biological organisms.

scholarly journals Nuclear translocation of silver ions and hepatocyte nuclear receptor impairment upon exposure to silver nanoparticles

2020 ◽  
Vol 7 (5) ◽  
pp. 1373-1387 ◽  
Author(s):  
Vanessa Tardillo Suárez ◽  
Elizaveta Karepina ◽  
Mireille Chevallet ◽  
Benoit Gallet ◽  
Cécile Cottet-Rousselle ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Nuclear Receptor ◽  
Endocrine Disruptor ◽  
Nuclear Translocation ◽  
Silver Ions ◽  
Ionic Form ◽  
Toxic Concentration

Upon exposure to non-toxic concentration of silver nanoparticles, only the ionic form of silver is found in the nucleus leading to an endocrine disruptor-like effect.

scholarly journals Biosynthesis of Silver nanoparticles using Desmodium Gangeticum leaf extract

2019 ◽  
Vol 10 (4) ◽  
pp. 3711-3716
Author(s):  
Niladry Sekhar Ghosh ◽  
Ritu M Giilhotra ◽  
Ranjit Singh ◽  
Angshu Banerjee
Keyword(s):  
Silver Nanoparticles ◽  
Leaf Extract ◽  
Short Interval ◽  
Synthesis Method ◽  
Silver Ions ◽  
Cost Effective ◽  
Environment Friendly ◽  
Crystalline Nature ◽  
Average Size ◽  
Short Time

A range of methods is available for the synthesize nanoparticles. However, these methods are associated with the production of undesirable byproducts which are quite hazardous and high costs. Thus a number of efforts are being made to develop novel cost-effective safe & reliable "green" procedures which caned produce desired nanoparticles. In this study, we caned successfully develop a green synthesis method for preparation of silver nanoparticles using Desmodium gangeticum leaf extract as reducing & capping agents. The method was found a quite effective inversion of silver ions to silver nanoparticles in a short interval of time. The developed nanoparticles exhibited Surface plasmon resonance at around 500 nm. The particles are nearly spherical, and the size ranged between 16-64nm. The average size was noted to be around 40 nm. The nanoparticles were characterized for their morphology using UV-vis, TEM, FTIR analysis and FESEM. The developed method carries the advantage of the completion of the reaction in a short time. The crystalline nature of the synthesize nanoparticles was assessed & confirm by XRD & EDX Studies. From FTIR studies, it can be understood that the flavonoids could be adsorbed on the metal surface by interaction with carbonyl groups. The process was carried out in the environment-friendly condition.

scholarly journals The Effect of pH on the Size of Silver Nanoparticles Obtained in the Reduction Reaction with Citric and Malic Acids

Materials ◽  
2020 ◽  
Vol 13 (23) ◽  
pp. 5444
Author(s):  
Lukasz Marciniak ◽  
Martyna Nowak ◽  
Anna Trojanowska ◽  
Bartosz Tylkowski ◽  
Renata Jastrzab
Keyword(s):  
Silver Nanoparticles ◽  
Citric Acid ◽  
Malic Acid ◽  
Silver Ions ◽  
Reduction Reaction ◽  
Heating Time ◽  
Molar Ratio ◽  
Vis Spectroscopy ◽  
Wide Ph Range ◽  
Average Size

In colloidal methods, the morphology of nanoparticles (size and shape) as well as their stability can be controlled by changing the concentration of the substrate, stabilizer, adding inorganic salts, changing the reducer/substrate molar ratio, and changing the pH and reaction time. The synthesis of silver nanoparticles was carried out according to the modified Lee and Meisel method in a wide pH range (from 2.0 to 11.0) using citric acid and malic acid, without adding any additives or stabilizers. Keeping the same reaction conditions as the concentration of acid and silver ions, temperature, and heating time, it was possible to determine the relationship between the reaction pH, the type of acid, and the size of the silver nanoparticles formed. Obtained colloids were analyzed by UV-Vis spectroscopy and investigated by means of Transmission Electron Microscope (TEM). The study showed that the colloids reduced with citric acid and malic acid are stable over time for a minimum of seven weeks. We observed that reactions occurred for citric acid from pH 6.0 to 11.0 and for malic acid from pH 7.0 to 11.0. The average size of the quasi-spherical nanoparticles changed with pH due to the increase of reaction rate.

scholarly journals Argovit™ Silver Nanoparticles Effects on Allium cepa: Plant Growth Promotion without Cyto Genotoxic Damage

Nanomaterials ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 1386 ◽  
Author(s):  
Francisco Casillas-Figueroa ◽  
María Evarista Arellano-García ◽  
Claudia Leyva-Aguilera ◽  
Balam Ruíz-Ruíz ◽  
Roberto Luna Vázquez-Gómez ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Allium Cepa ◽  
Growth Promotion ◽  
Physicochemical Characterization ◽  
Biological Response ◽  
Silver Ions ◽  
Metallic Silver ◽  
Coating Agent ◽  
Genotoxic Damage ◽  
Design And Manufacture

Due to their antibacterial and antiviral effects, silver nanoparticles (AgNP) are one of the most widely used nanomaterials worldwide in various industries, e.g., in textiles, cosmetics and biomedical-related products. Unfortunately, the lack of complete physicochemical characterization and the variety of models used to evaluate its cytotoxic/genotoxic effect make comparison and decision-making regarding their safe use difficult. In this work, we present a systematic study of the cytotoxic and genotoxic activity of the commercially available AgNPs formulation Argovit™ in Allium cepa. The evaluated concentration range, 5–100 µg/mL of metallic silver content (85–1666 µg/mL of complete formulation), is 10–17 times higher than the used for other previously reported polyvinylpyrrolidone (PVP)-AgNP formulations and showed no cytotoxic or genotoxic damage in Allium cepa. Conversely, low concentrations (5 and 10 µg/mL) promote growth without damage to roots or bulbs. Until this work, all the formulations of PVP-AgNP evaluated in Allium cepa regardless of their size, concentration, or the exposure time had shown phytotoxicity. The biological response observed in Allium cepa exposed to Argovit™ is caused by nanoparticles and not by silver ions. The metal/coating agent ratio plays a fundamental role in this response and must be considered within the key physicochemical parameters for the design and manufacture of safer nanomaterials.

scholarly journals Synthesis of biogenic silver nanoparticles from the seed coat waste of pistachio (Pistacia vera) and their effect on the growth of eggplant

2021 ◽  
Vol 10 (1) ◽  
pp. 1789-1800
Author(s):  
Masudulla Khan ◽  
Azhar U. Khan ◽  
Il Soo Moon ◽  
Raed Felimban ◽  
Raed Alserihi ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Fly Ash ◽  
Plant Growth ◽  
Seed Coat ◽  
Silver Ions ◽  
Active Surface ◽  
Surface Plasmon Resonance Peak ◽  
Nanoparticle Suspension ◽  
Plasmon Resonance Peak ◽  
Average Size

Abstract Herein, the synthesis of silver nanoparticles using extracts of pistachio seed coat waste is investigated. The surface plasmon resonance peak at 443 nm was observed in the nanoparticles by using ultraviolet-visible spectroscopy (UV-Vis). To identify potential biomolecules involved in the bio-reduction of silver ions, Fourier-transform infrared spectroscopy (FTIR) was used. Scanning and transmission electron microscopy (SEM and TEM) show irregular shapes with an average size of ∼20 nm. The active surface determined by Brunauer, Emmett, and Teller analysis was 22 m2/g. The effect of silver nanoparticles on eggplants sprayed with a nanoparticle suspension of 75 mg/L led to increased plant growth and chlorophyll and carotenoid contents. The fly ash addition to the soil promoted plant growth. The highest increase in plant growth occurs when plants were sprayed with 75 ppm AgNPs in 20% fly ash amended soil.

scholarly journals PHYTOMEDIATED SYNTHESIS OF SILVER NANOPARTICLES AGAINST MICROBIAL PATHOGENS AND CYTOTOXICITY ON HUMAN BREAST CANCER CELLS (MCF-7)

2020 ◽  
pp. 16-24
Author(s):  
P. Karthiga ◽  
T. Shankar ◽  
K. Karthick ◽  
K. Swarnalatha
Keyword(s):  
Silver Nanoparticles ◽  
Electron Microscope ◽  
Silver Ions ◽  
Xrd Analysis ◽  
Vital Role ◽  
Microbial Pathogens ◽  
Root Extract ◽  
Average Size ◽  
Mcf 7 ◽  
Abutilon Indicum

Silver nanoparticles (AgNPs) are synthesized from the root extract of the Abutilon indicum plant. Nitrate reductase enzyme and/or other extra cellular proteins released from the extract reduce the silver nitrate to silver ions. These proteins or enzymes serve as a template for the silver nucleation sites in the development of silver nanoparticles, and also act as capping agents, preventing silver ion agglomeration. XRD analysis predicts the phase of the nanoparticles. Transmission Electron Microscope (TEM) and Scanning Electron Microscope analyses have revealed that the synthesized AgNPs are spherical in shape, with an average size of 17 nm. From the data, it is noted that the protein molecules and fatty acids present in the root extract of Abutilon indicum, play a vital role in reducing silver salts and as capping AgNPs at various concentrations. Bactericidal activity acting against the clinical pathogens was performed, and it was observed that NP inhibition is highly dependent on their size and surface. Cytotoxic studies were carried out with these synthesized silver nanoparticles using MTT assay on MCF-7 cells.

Response of dryland spring wheat yield to elevated CO2 concentration and temperature by APSIM model

2012 ◽  
Vol 20 (8) ◽  
pp. 1088-1095
Author(s):  
Guang LI ◽  
Yue LI ◽  
Gao-Bao HUANG ◽  
Zhu-Zhu LUO ◽  
Qi WANG ◽  
...  
Keyword(s):  
Spring Wheat ◽  
Wheat Yield

Antimicrobial Activity of Silver Nanoparticles Synthesized by Streptomyces Species JF714876

2012 ◽  
Vol 5 (1) ◽  
pp. 1638-1642 ◽  
Author(s):  
Vidyasagar G M ◽  
Shankaravva B ◽  
R Begum ◽  
Imrose ◽  
Sagar R ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Silver Nanoparticles ◽  
Silver Ions ◽  
Human Beings ◽  
Streptomyces Species ◽  
Force Microscopy ◽  
E Coli ◽  
Extracellular Synthesis ◽  
Atomic Force ◽  
Uv Visible

Microorganisms like fungi, actinomycetes and bacteria are considered nanofactories and are helpful in the production of nanoparticles useful in the welfare of human beings. In the present study, we investigated the production of silver nanoparticles from Streptomyces species JF714876. Extracellular synthesis of silver nanoparticles by Streptomyces species was carried out using two different media. Silver nanoparticles were examined using UV-visible, IR and atomic force microscopy. The size of silver nanoparticles was in the range of 80-100 nm. Antimicrobial activity of silver nanoparticle against bacteria such as E. coli, S. aureus, and dermatophytes like T. rubrum and T. tonsurans was determined. Thus, this study suggests that the Streptomyces sp. JF741876 can produce silver ions that can be used as an antimicrobial substance.

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