Silver ion catalyzed rearrangements of strained .sigma. bonds. Application to the homocubyl and 1,1'-bishomocubyl systems

1970 ◽  
Vol 92 (8) ◽  
pp. 2584-2586 ◽  
Author(s):  
Leo A. Paquette ◽  
John C. Stowell
Keyword(s):  
Silver Ion ◽  
Sigma Bonds

scholarly journals Barley somatic embryogenesis-an attempt to modify variation induced in tissue culture

2021 ◽  
Vol 28 (1) ◽  
Author(s):  
Renata Orłowska
Keyword(s):  
Tissue Culture ◽  
Somatic Embryogenesis ◽  
Taguchi Method ◽  
Culture Conditions ◽  
Dna Demethylation ◽  
Silver Ion ◽  
Donor Plant ◽  
In Vitro Tissue Culture ◽  
Induced Variation

Abstract Background Somatic embryogenesis is a phenomenon carried out in an environment that generates abiotic stress. Thus, regenerants may differ from the source of explants at the morphological, genetic, and epigenetic levels. The DNA changes may be the outcome of induction media ingredients (i.e., copper and silver ions) and their concentrations and time of in vitro cultures. Results This study optimised the level of copper and silver ion concentration in culture media parallel with the induction medium longevity step towards obtaining barley regenerants via somatic embryogenesis with a minimum or maximum level of tissue culture-induced differences between the donor plant and its regenerants. The optimisation process is based on tissue culture-induced variation evaluated via the metAFLP approach for regenerants derived under varying in vitro tissue culture conditions and exploited by the Taguchi method. In the optimisation and verification experiments, various copper and silver ion concentrations and the different number of days differentiated the tested trials concerning the tissue culture-induced variation level, DNA demethylation, and de novo methylation, including symmetric (CG, CHG) and asymmetric (CHH) DNA sequence contexts. Verification of optimised conditions towards obtaining regenerants with minimum and maximum variability compared to donor plants proved useful. The main changes that discriminate optimised conditions belonged to DNA demethylation events with particular stress on CHG context. Conclusions The combination of tissue culture-induced variation evaluated for eight experimental trials and implementation of the Taguchi method allowed the optimisation of the in vitro tissue culture conditions towards the minimum and maximum differences between a source of tissue explants (donor plant) and its regenerants from somatic embryos. The tissue culture-induced variation characteristic is mostly affected by demethylation with preferences towards CHG sequence context.

scholarly journals Biofilm Inhibition and Antimicrobial Properties of Silver-Ion-Exchanged Zeolite A against Vibrio spp Marine Pathogens

2021 ◽  
Vol 11 (12) ◽  
pp. 5496
Author(s):  
Zarina Amin ◽  
Nur Ariffah Waly ◽  
Sazmal Effendi Arshad
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Antimicrobial Properties ◽  
Immune Defense ◽  
Silver Ion ◽  
Bacterial Disease ◽  
Zeolite A ◽  
Biofilm Inhibition ◽  
Volcanic Origin ◽  
Scanning Electron

A challenging problem in the aquaculture industry is bacterial disease outbreaks, which result in the global reduction in fish supply and foodborne outbreaks. Biofilms in marine pathogens protect against antimicrobial treatment and host immune defense. Zeolites are minerals of volcanic origin made from crystalline aluminosilicates, which are useful in agriculture and in environmental management. In this study, silver-ion-exchanged zeolite A of four concentrations; 0.25 M (AgZ1), 0.50 M (AgZ2), 1.00 M (AgZ3) and 1.50 M (AgZ4) were investigated for biofilm inhibition and antimicrobial properties against two predominant marine pathogens, V. campbelli and V. parahemolyticus, by employing the minimum inhibitory concentration (MIC) and crystal violet biofilm quantification assays as well as scanning electron microscopy. In the first instance, all zeolite samples AgZ1–AgZ4 showed antimicrobial activity for both pathogens. For V. campbellii, AgZ4 exhibited the highest MIC at 125.00 µg/mL, while for V. parahaemolyticus, the highest MIC was observed for AgZ3 at 62.50 µg/mL. At sublethal concentration, biofilm inhibition of V. campbelli and V. parahemolyticus by AgZ4 was observed at 60.2 and 77.3% inhibition, respectively. Scanning electron microscopy exhibited profound structural alteration of the biofilm matrix by AgZ4. This is the first known study that highlights the potential application of ion-exchanged zeolite A against marine pathogens and their biofilms.

ChemInform Abstract: Synthesis and Silver Ion Catalyzed Reactions of 3,3′-Ethylenebicyclopropenyl.

ChemInform ◽  
1987 ◽  
Vol 18 (3) ◽  
Author(s):  
F. C. PEELEN ◽  
I. J. LANDHEER ◽  
W. H. DE WOLF ◽  
F. BICKELHAUPT
Keyword(s):  
Silver Ion ◽  
Catalyzed Reactions

Latent Patterned Surface Metallization of Silver Ion-Doped Polyimide Films

2009 ◽  
Vol 1192 ◽  
Author(s):  
Luke M. Davis ◽  
Tyler S. Stukenbroeker ◽  
Christopher J. Abelt ◽  
Joseph L. Scott ◽  
Evguenia Orlova ◽  
...  
Keyword(s):  
Ambient Temperature ◽  
Reducing Agents ◽  
Equimolar Amount ◽  
Silver Ion ◽  
Polyimide Films ◽  
Patterned Surface ◽  
Specular Reflectivity ◽  
Surface Metallization ◽  
Polycrystalline Silver

AbstractA straightforward ambient temperature route to the fabrication of surface silver-metallized polyimide films is described. Silver(I) trifluoromethane sulfonate and a polyimide, derived from 2,2-bis(3,4-dicarboxyphenyl)hexafluoropropane dianhydride (6FDA) and an equimolar amount of 4,4'-oxydianiline (ODA) and 3,5-diaminobenzoic acid (DABA), were dissolved together in dimethylacetamide. Silver(I)-doped films were prepared at thicknesses of 25-50 microns and depleted of solvent by evaporation. The silver(I)-containing films were then treated with aqueous reducing agents, which brought forth silvered films exhibiting conductivity on the order of bulk polycrystalline silver and good specular reflectivity.

Single-Particle Hyperspectral Imaging Reveals Kinetics of Silver Ion Leaching from Alloy Nanoparticles

ACS Nano ◽  
2021 ◽  
Author(s):  
Alexander Al-Zubeidi ◽  
Frederic Stein ◽  
Charlotte Flatebo ◽  
Christoph Rehbock ◽  
Seyyed Ali Hosseini Jebeli ◽  
...  
Keyword(s):  
Hyperspectral Imaging ◽  
Single Particle ◽  
Silver Ion ◽  
Alloy Nanoparticles ◽  
Kinetics Of

Comparing the Antimicrobial Effect of Silver Ion-Coated Silicone and Gentamicin-Irrigated Silicone Sheets from Breast Implant Material

2021 ◽  
Author(s):  
Fadi Heno ◽  
Ziv Azoulay ◽  
Boris Khalfin ◽  
Hillary A. Craddock ◽  
Eldad Silberstein ◽  
...  
Keyword(s):  
Breast Implant ◽  
Antimicrobial Effect ◽  
Silver Ion ◽  
Implant Material
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