Effect of cobalt and silver ions and naphthaleneacetic acid on fruit retention in mango (Mangifera indica L.)

1990 ◽  
Vol 30 (3) ◽  
pp. 433 ◽  
Author(s):  
SSM Naqvi ◽  
SM Alam ◽  
S Mumtaz
Keyword(s):  
Silver Nitrate ◽  
Mangifera Indica ◽  
Silver Ions ◽  
Cobalt Nitrate ◽  
Naphthaleneacetic Acid ◽  
Whole Tree

The effect of aqueous spray of cobalt nitrate, silver nitrate or 1-naphthaleneacetic acid (NAA) on fruit retention in mango (Mangifera indica L.) was investigated at Tando Jam, Pakistan. The chemicals were applied to immature fruits at pea size (5-6 mm) and again 2 weeks later when the fruitlets had developed to marble size (10-15 mm). Three cultivars, Sindhri, Langra (3 seasons) and Dasehari (4 seasons), were tested and it was observed that all concentrations of the chemicals significantly (P<0.05) increased fruit retention. In Sindhri, cobalt nitrate, silver nitrate and NAA treatments increased yields by 106-165%, 89-146% and 94-115%, respectively, and in Langra by 100-135%, 98-138% and 95-118%. Whole tree sprays of cv. Dasehari with Co(NO3)2 at 100 mg/L, AgNO3 at 100 mg/L, and NAA at 20 mg/L yielded 129%, 66% and 54% more fruit than the control.

scholarly journals Gel Formation in Low Concentrated Solutions of Glycyram and Amino Acids in the Presence of Silver Nitrate

2021 ◽  
Vol 7 (11) ◽  
pp. 11-21
Keyword(s):  
Amino Acids ◽  
Silver Nitrate ◽  
Food Industry ◽  
Silver Ions ◽  
Electrolyte Solutions ◽  
Low Molecular Weight ◽  
Gel Formation ◽  
Recent Past ◽  
Concentrated Solutions ◽  
Low Concentrations

Abstract. Research relevance: low molecular weight supramolecular hydrogels are unique objects that can solve many pressing problems in medicine, food industry and other sectors of the national economy. Research objectives: in recent past, it was discovered that low-concentration solutions of L-cysteine and silver nitrate (CSN) can form, when electrolyte solutions are added to hydrogels. We were faced with the task of obtaining hydrogels from dilute solutions of glycyram (GC) by adding CSN, since GC, due to its poor solubility, has low bioavailability. Materials and research methods: using the method of isomolar series, a comparative study of the formation of hydrogels by dilute GC solutions with the addition of CSN and GCP was carried out. It has been found that most durable hydrogels were obtained using CSN. Thus, GC hydrogels were obtained at a concentration of 10−3 M after adding CSN and GCP, which have a supramolecular character and combine the properties of GC, amino acids, and silver ions. Research results: glycyram hydrogels were obtained at its concentration equal to 10−3 M by mixing it with silver amino acids L-cysteine (CSN) and L-glutamic acid (GCP) solutions in same low concentrations. Conclusions: hydrogels with glycyram form silver solutions of those amino acids that are capable of giving frame structures at a ratio of amino acid: silver nitrate of 1.25.

Pretreated Lignocellulosic Waste Mediated Biosynthesis of Silver Nanoparticles Under Room Temperature

2016 ◽  
Vol 15 (05n06) ◽  
pp. 1660001 ◽  
Author(s):  
V. P. Manjamadha ◽  
Karuppan Muthukumar
Keyword(s):  
Silver Nanoparticles ◽  
Silver Nitrate ◽  
Room Temperature ◽  
Nitrate Solution ◽  
Silver Ions ◽  
Silver Nitrate Solution ◽  
Morphological Characterization ◽  
Alternative Source ◽  
X Ray ◽  
Antibacterial Performance

The current work elucidates the utilization of biowaste as a valuable reducing agent for the synthesis of silver nanoparticles. In this study, the wastewater generated during the alkaline pretreatment of lignocellulosic wastes (APLW) was used as a bioreductant to reduce silver nitrate under room temperature. Synthesis of stable silver nanoparticles (AgNPs) was achieved rapidly on addition of APLW into the silver nitrate solution (1[Formula: see text]mM). The morphological characterization of AgNPs was performed using field emission scanning electron microscopy (FESEM). The micrograph clearly depicted the presence of spherical AgNPs. The presence of elemental silver along with biomoilties was determined using energy dispersive X-ray spectroscopy (EDAX) analysis. The X-ray diffraction (XRD) study proved the crystalline form of stable AgNPs. The AgNPs exhibited excellent antibacterial performance against Gram negative organism. The immediate bioreduction of silver ions using APLW was well illustrated in the present study. Thus, APLW serve as an alternative source for reducing agents instead of utilizing valuable medicinal plants for nanoparticles synthesis.

scholarly journals Two Modes of Nanoleakage Expression in Single-step Adhesives

2002 ◽  
Vol 81 (7) ◽  
pp. 472-476 ◽  
Author(s):  
F.R. Tay ◽  
D.H. Pashley ◽  
M. Yoshiyama
Keyword(s):  
Silver Nitrate ◽  
Silver Ions ◽  
Single Step ◽  
Mineral Dissolution ◽  
Resin Infiltration ◽  
Transmission Electron ◽  
Hybrid Layers ◽  
Self Etch ◽  
Ammoniacal Silver ◽  
Spotted Pattern

Self-etch adhesives that etch, prime, and bond simultaneously should not exhibit incomplete resin infiltration within hybrid layers. We hypothesized that nanoleakage patterns in these systems are artifacts caused by mineral dissolution in mildly acidic silver nitrate. Resin-dentin interfaces bonded with four single-step, self-etch adhesives were examined for nanoleakage by conventional (pH 4.2) and basic ammoniacal (pH 9.5) silver nitrate and prepared for transmission electron microscopy. All adhesives exhibited a reticular mode of nanoleakage within hybrid layers when conventional silver nitrate was used. With ammoniacal silver nitrate, an additional spotted pattern of nanoleakage was observed within adhesive and hybrid layers. The reticular mode of nanoleakage in self-etch adhesives probably represents sites of incomplete water removal that leads to regional suboptimal polymerization. The spotted pattern identified with the use of ammoniacal silver nitrate probably represents potentially permeable regions in the adhesive and hybrid layers that result from the interaction of the basic diamine silver ions with acidic/hydrophilic resin components.

VAPOR PRESSURES OF AQUEOUS SOLUTIONS OF SILVER NITRATE, OF AMMONIUM NITRATE, AND OF LITHIUM NITRATE

1956 ◽  
Vol 34 (2) ◽  
pp. 151-159 ◽  
Author(s):  
A. N. Campbell ◽  
J. B. Fishman ◽  
G. Rutherford ◽  
T. P. Schaefer ◽  
L. Ross
Keyword(s):  
Aqueous Solutions ◽  
Silver Nitrate ◽  
Direct Determination ◽  
Lithium Ion ◽  
Silver Ions ◽  
Lithium Nitrate ◽  
Vapor Pressures ◽  
Heats Of Dilution ◽  
Water Of Hydration

This paper is devoted to the direct determination of the vapor pressures of solutions of the nitrates of silver, of ammonium, and of lithium, at temperatures varying from 30 °C. to 105 °C. and at concentrations varying from 10 to 85 weight % (for lithium nitrate, the limited solubility precluded measurements beyond 65%). From the vapor pressures, the enthalpies of evaporation of water (by a modification of the Clapeyron–Clausius equation), the differential heats of dilution, and the activities of water (as compared with the mole fractions of the solvent) have been calculated. From the results we conclude that the water of hydration of the ammonium and silver ions (if, indeed, these ions are hydrated at all) is very loosely attached, while that of the lithium ion is strongly bound.

scholarly journals SILVER – SILVER ION EXCHANGE REACTIONS

1953 ◽  
Vol 31 (4) ◽  
pp. 319-327 ◽  
Author(s):  
A. Baerg ◽  
C. A. Winkler
Keyword(s):  
Ion Exchange ◽  
Silver Nitrate ◽  
Surface Area ◽  
Nitrate Solution ◽  
Silver Ions ◽  
Silver Nitrate Solution ◽  
Ionic Form ◽  
Exchange Reactions ◽  
Planar Area ◽  
Silver Silver

The extent of the exchange between silver foils and silver ions in nitrate solution was compared with surface area measurements made by the Bowden-Rideal method. No quantitative correspondence between the two measurements was observed. During one hour the exchange with mechanically abraded surfaces affected about 30 apparent atomic layers of the metal, but this was reduced to about one-half this value when the surfaces were equilibrated for several days in inactive silver nitrate. Etched foils exchanged during one hour to a.depth of only about 2 apparent atomic layers and this was not affected by equilibration. Bowden-Rideal area measurements gave values of roughly 7 and 15 times the planar area for etched and abraded specimens respectively. These values were not altered by equilibration of the surfaces. Only about 50% of the acquired radioactivity was subsequently removable in inactive silver nitrate solution. Part of the measured radioactivity was present on the surface in adsorbed ionic form and was not removable by a simple water wash. The magnitude of this adsorbed activity was found to be measurable electrometrically.

Studies of the antimicrobial ability and silver ions migration from silver nitrate-incorporated electrospun nylon nanofibers

2018 ◽  
Vol 16 ◽  
pp. 129-137 ◽  
Author(s):  
Tien-Hsin Cheng ◽  
Shih-Bin Lin ◽  
Li-Chen Chen ◽  
Hui-Huang Chen
Keyword(s):  
Silver Nitrate ◽  
Silver Ions

scholarly journals The Mode of Action of Silver and Silver Halides Nanoparticles against Saccharomyces cerevisiae Cells

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
A. A. Kudrinskiy ◽  
A. Yu. Ivanov ◽  
E. V. Kulakovskaya ◽  
A. I. Klimov ◽  
P. M. Zherebin ◽  
...  
Keyword(s):  
Saccharomyces Cerevisiae ◽  
Silver Nitrate ◽  
Silver Ions ◽  
Tween 80 ◽  
Cell Loss ◽  
Yeast Cells ◽  
Silver Halides ◽  
Silver Nps ◽  
Sodium Borohydride Reduction ◽  
Synthesized Materials

Silver and silver halides nanoparticles (NPs) (Ag, AgCl, AgBr, and AgI) capped with two different stabilizers (sodium citrate and nonionic surfactant Tween 80) were obtained via sodium borohydride reduction of silver nitrate in an aqueous solution. The effect of the biocidal action of as-prepared synthesized materials against yeast cells Saccharomyces cerevisiae was compared to the effect produced by silver nitrate and studied through the measurement of cell loss and kinetics of K+ efflux from the cells depending on concentration of silver. The results clearly indicate that the silver ions either remained in the dispersion of silver NPs and silver halides NPs after their synthesis or were generated afterwards by dissolving silver and silver halides particles playing a major part in the cytotoxic activity of NPs against yeast cells. It was also supposed that this activity most likely does not relate to the damage of cell membrane.

Unstable Reshaping of Gold Nanorods Prepared by a Wet Chemical Method in the Presence of Silver Nitrate

2006 ◽  
Vol 6 (11) ◽  
pp. 3355-3359 ◽  
Author(s):  
Muhammad Iqbal ◽  
Giyoong Tae
Keyword(s):  
Silver Nitrate ◽  
Gold Nanorods ◽  
Small Diameter ◽  
Silver Ions ◽  
Blue Shift ◽  
Aqueous Environment ◽  
Ctab Concentration ◽  
Seed Particles ◽  
The Stability ◽  
Growth Approach

We characterized the stability of the gold nanorods synthesized by means of a seed mediated growth approach in the presence of AgNO3, which consists of synthesis of small diameter seed particles (∼4 nm) and subsequent growth of these nanoparticles into nanorods by addition to gold salt solution containing cetyltrimethylammonium bromide (CTAB) in the presence of ascorbic acid. The presence of silver nitrate significantly enhanced the nanorod synthesis as previously reported. However, the synthesized nanorods were unstable and reshaped in aqueous environment; the continuous blue-shift of the 2nd plasmon bands was monitored and the changes in the nanorod morphologies were also observed by electron microscopy with increasing storage time. This reshaping was observed at wide CTAB concentration range regardless of the removal of the unreacted gold or silver ions.

scholarly journals Influence of Surfactant Additives on Photochemical Synthesized Silver Nanoparticles using UV Pulsed Laser Irradiations in Aqueous Silver Nitrate Solution

2021 ◽  
Vol 24 (2) ◽  
pp. 103-110
Author(s):  
Umair Yaqub Qazi
Keyword(s):  
Silver Nitrate ◽  
Structural Control ◽  
Nitrate Solution ◽  
Micelle Formation ◽  
Silver Ions ◽  
Silver Nitrate Solution ◽  
Hydrocarbon Chain ◽  
Carbon Chain ◽  
Minor Effect ◽  
A Minor

The effect of different additives on the AgNPs formation process was explored in this study. AgNPs were synthesized in an aqueous solution of silver nitrate-containing surfactants by photoreduction of silver ions. The concentration dependency of AgNPs formation suggested that stability was induced by the equilibrium of AgNPs adsorbed by surfactants with higher carbon chain molecules such as SDS and AOT. These results open up a new window both for structural control and the development process. It also indicated that different additives had an impact on the morphology of NPs. The hydrocarbon chain influenced the growth process and demonstrated that <10 carbon chain surfactants such as SMS, SOS, did not constitute the CGC and had a minor effect on the mechanism of growth. However, the NPs formation begun at a lower limit indicated as CGC. It was observed only with hydrocarbon chains of > 10 carbon atoms such as AOT, SDS. Fluorescence results confirmed that after laser irradiation, hemi-micelle formation after the development of AgNPs.

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