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PubMed1987

Argyria: the intradermal "photograph," a manifestation of passive photosensitivity.

X-ray microprobe and electron microscopic study was made of the remarkable blue-black pigmentation that sunlight elicits in patients with argyria. The patient under study had developed argyria following injection of silver nitrate as a sclerosant into his varicose veins 41 years ago. Similarities are demonstrated between the darkening of the skin and the darkening of a photographic film following light exposure. In both instances, colorless silver salts and compounds present in an inert matrix (collagen versus gelatin) are reduced by incident light to black metallic silver. This passive photosensitivity reaction leads to silver tattooing of the light-exposed skin and to photographic imaging in the film.

Aged↗
PubMed1977

Plasmid-determined resistance to tellurium compounds.

Transferable plasmids in gram-negative bacteria that confer resistance to potassium tellurite or tellurate were found. This re-istance was distinct from resistance to mercury, silver, or arsenic compounds and was unrelated to antibiotic resistance. In Escherichia coli, plasmids determine a 100-fold increase in the minimal inhibitory concentration for tellurite and a 10-fold increase in tellurate resistance. Many, but not all, of the plasmids belong to incompatibility group S. In Pseudomonas aeruginosa, tellurium resistance is specifically associated with incompatibility group P-2 and involves a 5- to 10-fold increase in tellurite or tellurate resistance.

Anti-Bacterial Agents↗
PubMed1992

[Comparative effectiveness of antimicrobial action of antiseptics against pathogens of chronic purulent otitis media].

Comparable antimicrobial and disinfecting action of decamethoxine and silver preparations on pathogens of chronic purulent otitis media (CPOM) was studied. The clinical isolates of staphylococci proved to be most sensitive to decamethoxine whose MBcC conformed to 16.5 micrograms/ml. The antimicrobial action on Proteus spp. and Pseudomonas aeruginosa was less pronounced. The required concentrations for bactericidal action on these pathogens were 69 and 93.5 micrograms/ml, respectively. The antimicrobial activity of the silver preparations such as poviargol, collargol and protargol was low. Depending on the microbial species, the bactericidal effect of the silver preparations was 12-235 times lower than that of decamethoxin. It was also shown that decamethoxin had a high disinfecting action on CPOM pathogens. It was noted that decamethoxin had a marked ability to increase the bactericidal action of poviargol (by 2-14 times) and its disinfecting action (by 2 times) on Proteus spp., E. coli and Ps. aeruginosa.

Anti-Infective Agents, Local↗
PubMed2000

Bridged silver(I) complexes of the polycyclic aromatic compounds tetraphenylethylene and 1,1,4,4-tetraphenyl-1,3-butadiene.

For the purpose of investigating the coordination behavior of the sterically congested alkenes and exploring the possibility of cofacial complexation in the polycyclic aromatic system for formation of extended polymeric networks, tetraphenylethylene (tphe) and 1,1,4,4-tetraphenyl-1,3-butadiene (tphb) have been studied with regard to their complexation with a silver(I) ion. The crystal structures of [Ag(tphe)(ClO4)(p-xylene)], [Ag2(tphe)(ClO4)2], [Ag4(tphe)(CF3SO3)4], [Ag2(tphb)(ClO4)2], and [Ag2(tphb)(CF3SO3)2], together with the metal-free ligands tphe and tphb, have been determined by single-crystal X-ray diffraction. The pi-electron-rich cleft in organic components is found to offer a potential site for complexation, which can be utilized to generate an interesting array of organometallic compounds with one- and two-dimensional frameworks.

Journal Article↗
PubMed2004

Vibrational properties of the free and adsorbed acridone.

Theoretical density functional theory (DFT) calculation, ab initio and experimental vibrational characterization of acridone were performed. The computed vibrational modes agree well with the experimental values of the related crystal structure. Surface enhanced Raman scattering (SERS) of acridone in silver colloids with different surface potential values was studied. FT-SERS spectrum of acridone revealed different adsorption behavior of the title compound on the silver particles.

Acridines↗
PubMed1976

[The resistance of "Pseudomonas" to antibiotics and heavy metal: minimal inhibitory concentrations and genetic transfers (author's transl)].

The antibiotic sensitivity of 43 strains of Pseudomonas and the minimal inhibitory concentration of mercurial derivatives (5 mineral salts and 4 organics compounds) and of silver nitrate to these microorganisms have been studied. Twelve of these strains were P. aeruginosa of hospital origin, and 31 were Pseudomonas from surface water. Resistance against these inhibitory substances let us to established some connections between the different strains. Some strains were selected to transfer resistance markers by conjugation.

Anti-Bacterial Agents↗
PubMed2004

Silver cages with encapsulated acetylenediide as building blocks for hydrothermal synthesis of supramolecular complexes with n-cyanopyridine and pyridine-n-carboxamide (n=3, 4).

New silver(i) double salts (Ag(2)C(2))(AgCF(3)CO(2))(8)(3-pyCONH(2))(2)(H(2)O)(4) (1), [(Ag(2)C(2))(AgCF(3)CO(2))(4)(4-pyCONH(2))(H(2)O)].H(2)O (2), (Ag(2)C(2))(AgCF(3)CO(2))(6)(3-pyCONH(2))(4) (3), (Ag(2)C(2))(AgCF(3)CO(2))(6)(3-pyCN)(2) (4) and (Ag(2)C(2))(AgCF(3)CO(2))(4)(4-pyCN)(2) (5) (n-pyCONH(2) is pyridine-n-carboxamide, n-pyCN is n-cyanopyridine; n=3, 4) have been synthesized by the hydrothermal method. All five compounds contain polyhedral silver(i) cages each encapsulating a C(2)(2-) dianion. Compounds 1, 3 ,4 and 5 exhibit three-dimensional structures, whereas compound 2 is a two-dimensional network. The structure of 1 is constructed from the linkage of a branched-tree architecture via hydrogen bonds. Unlike 4 and 5, which involve the connection of n-cyanopyridine (n=3, 4) with silver columns, 3 results from the linkage of discrete silver cages via pyridine-3-carboxamide.

Journal Article↗
PubMed1983

Metal compound intensification of the electron-density of diaminobenzidine.

Diaminobenzidine (DAB), commonly used in immunocytochemistry as the substrate for peroxidase, has a low electron density. DAB has a known affinity for the salts of some metals and therefore an examination of the ability of six metal compounds (including osmium tetroxide) to increase the electron density associated with DAB deposits has been undertaken. Ultra-thin sections of unosmicated rat pituitary gland, embedded in L. R. White resin, were immunostained by a hapten sandwich immunoperoxidase method, using antibodies to ACTH and TSH. The unintensified electron density of the DAB polymer reaction product on the specific endocrine granules was compared with the electron density resulting from the use of each of the six metal compounds. Lead and silver nitrate gave unsatisfactory results, while phosphotungstic acid and uranyl acetate produced a limited increase in specific electron density under the conditions used. Gold chloride was found to give the highest electron density to the specific endocrine granules, followed closely by osmium tetroxide. Background staining was greater when osmium was used. We conclude that several metal compounds may be used to intensify the electron density of DAB, but of the ones tested, gold chloride, which is safer, more stable, and cheaper than osmium tetroxide, was clearly the best. This approach not only increases the electron density of the DAB reaction product, but allows of the possibility of quantitation using energy dispersive X-ray analysis.

3,3'-Diaminobenzidine↗
PubMed1999

Silver cationization of thia fatty acids and esters in laser desorption/ionization time-of-flight mass spectrometry.

A laser desorption/ionization (LDI) time-of-flight mass spectrometric (TOF-MS) technique was used for the molecular mass analysis of thia fatty acids and esters, samples without appreciable light absorption at the laser wavelength. After a sample overlayer is deposited by solvent evaporation on a thin silver film substrate, it is subjected to 355 or 532 nm Nd : YAG laser irradiation. Photoablation of the Ag film substrate occurs with sufficient laser fluence, producing silver cluster cations, which can react with the desorbed thia fatty acid or ester molecules in the gas phase. Silver cation attachment of thia fatty esters may produce a silver-cationized analyte and fragments of structural diagnostic value, whereas thia fatty acids would not. With oxygen(s) present on the sulfur in sulfoxy fatty acids and esters, a silver-cationized analyte and additional fragments are produced. Formation of these fragments is consistent with charge-remote mechanisms through simple cleavage and rearrangement pathways. The structural reactivity of these compounds with ablated silver cations is hence comprehensively analyzed.

Esters↗
PubMed2006

Synthesis and steric stabilization of silver nanoparticles in neat carbon dioxide solvent using fluorine-free compounds.

The adjustable solvent properties, vanishingly low surface tensions, and environmentally green characteristics of supercritical carbon dioxide present certain advantages in nanoparticles synthesis and processing. Unfortunately, most current techniques employed to synthesize and disperse nanoparticles in carbon dioxide use environmentally persistent fluorinated compounds as metal precursors and/or stabilizing ligands. This paper illustrates a one-step process for synthesis and stabilization of silver nanoparticles in carbon dioxide using only fluorine-free compounds. Isostearic acid coated silver nanoaparticles were formed and stably dispersed through arrested precipitation. Silver bis(3,5,5-trimethyl-1-hexyl)sulfosuccinate (Ag-AOT-TMH) was reduced in the presence of isostearic acid as a capping ligand in carbon dioxide solvent to form silver nanoparticles. The addition of cyclohexane as cosolvent or an increase in carbon dioxide solvent density enhances the dispersibility of the particles due to an increase in solvent strength. The dispersibility of the isostearic acid capped silver nanoparticles diminished with time until a stable dispersion was achieved due to the precipitation of a fraction of particle sizes too large to be stabilized by the solvent medium, thereby leaving a smaller size fraction of nanoparticles stably dispersed in the CO2 mixtures. This paper presents the one-step synthesis and stabilization of metallic nanoparticles in neat carbon dioxide without the aid of any fluorinated compounds.

Journal Article↗
PubMed1981

Distribution of membrane glycoproteins among the organelles of a single identified neuron of Aplysia. II. Isolation and characterization of a glycoprotein associated with vesicles.

Glycoprotein-I (mol.wt. 180,000) is associated with a vesicle fraction from the cytoplasm of R2, the giant cholinergic neuron in the abdominal ganglion. Electron microscopy has shown that R2 contains both lucent and compound vesicles. We have used anisomycin, an inhibitor of protein synthesis, to provide evidence that Component-I is a constituent of somatic compound vesicles. In the presence of the drug, [3H]N-acetylgalactosamine injected into R2 is incorporated almost exclusively into Component-I. Quantitative electron microscopic radioautography of treated cells shows a marked increase in the proportion of silver grains over compound vesicles and a decrease in labeling of other organelles compared with untreated cells. Analysis of Component-I, isolated using the chaotropic agent lithium diiodosalicylate, shows it to contain fucose, N-acetylgalactosamine, and N-acetylglucosamine. Proteolytic digestion with pronase yields a complex pattern of glycopeptides. The proportion of [3H]N-acetyl-galactosamine in these glycopeptides is altered in the presence of anisomycin. These results together with radioautographic analyses suggest that large carbohydrate chains are elaborated within the endoplasmic reticulum and that smaller chains are added in the Golgi region or on the membrane of the compound vesicle.

Acetylgalactosamine↗
PubMed1997

Silver-resistant mutants of Escherichia coli display active efflux of Ag+ and are deficient in porins.

Silver-resistant mutants were selected by stepwise exposure of silver-susceptible clinical strains of Escherichia coli, two of which did not contain any plasmids, to either silver nitrate or silver sulfadiazine. These mutants showed complete cross-resistance to both compounds. They showed low-level cross-resistance to cephalosporins and HgCl2 but not to other heavy metals. The Ag-resistant mutants had decreased outer membrane (OM) permeability to cephalosporins, and all five resistant mutants tested were deficient in major porins, either OmpF or OmpF plus OmpC. However, the well-studied OmpF- and/or OmpC-deficient mutants of laboratory strains K-12 and B/r were not resistant to either silver compound. Resistant strains accumulated up to fourfold less (110m)AgNO3 than the parental strains. The treatment of cells with carbonyl cyanide m-chlorophenylhydrazone increased Ag accumulation in Ag-susceptible and -resistant strains, suggesting that even the wild-type Ag-susceptible strains had an endogenous Ag efflux activity, which occurred at higher levels in Ag-resistant mutants. The addition of glucose as an energy source to starved cells activated the efflux of Ag. The results suggest that active efflux, presumably coded by a chromosomal gene(s), may play a major role in silver resistance, which is likely to be enhanced synergistically by decreases in OM permeability.

Adenosine Triphosphate↗
PubMed2003

Raman spectroscopy of silver pertechnetate.

The title compound, AgTcO4, contains close Ag-O contacts, and Raman spectroscopy shows a reduction in the Tc-O stretching frequencies on changing the pertechnetate counter-cation from K+ to Ag+.

Journal Article↗