Mercury levels in blood and mouth air before after chewing were measured 47 persons with 14 without dental amalgam restorations. Questionnaires relating to exogenous sources of mercury exposure administered both groups. Differences the statistically significant group amalgams, but not amalgams. Analysis data from questionnaires indicated that little or no occurred among two Blood concentrations positively correlated number surface area restorations significantly lower

There is no paucity of books on high pressure. Beginning with P. W. Bridgman's The Physics High Pressure, general interest include the two-volume and Chemistry edited by R. S. Bradley, series, Advances in Pressure Research, as well report Lake George Conference 1960. Solid state physics represented Solids Under Paul Warschauer, at Tomizuka Emrick, Properties Physiques des Solides sous Pression, Bloch, chapters Volumes 6, 13, 17, 19 State Physics, Seitz, Turnbull, Ehrenreich. gases liquids...

The expired air of a group 48 persons, 40 with and eight without dental amalgam restorations, was analyzed for its mercury content before after chewing. Expired samples were collected in polyethylene bags, known quantity each pumped into the detector measurement. results showed that examined subjects amalgams had higher pre-chewing levels their than those amalgams. After chewing, these increased an average 15.6-fold former remained unchanged latter group. It concluded situ can increase level air.

Pressure-induced electronic transitions have been observed in a wide variety of materials. In particular, Mössbauer resonance studies under high pressure revealed changes oxidation state and spin iron as function pressure. These processes involve the thermal transfer an electron to new ground system. The difference energy between states is frequently measured by optical absorption. this paper, we relate absorption peak its half-width two We show that will broaden with only if there force...

Methodology has been developed for the rapid determination of nitrate and nitrite in blood urine. In solution, these species are selectively reduced to nitric oxide, which is outgassed determined via its gas phase chemiluminescence reaction with ozone. Differentiation between obtained by careful selection reducing agents conditions.

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe pH dependence of carbon-13 nuclear magnetic resonance shifts tetracycline. Microscopic dissociation constantsG. L. Asleson and C. W. FrankCite this: J. Am. Chem. Soc. 1976, 98, 16, 4745–4749Publication Date (Print):August 1, 1976Publication History Published online1 May 2002Published inissue 1 August 1976https://pubs.acs.org/doi/10.1021/ja00432a009https://doi.org/10.1021/ja00432a009research-articleACS PublicationsRequest reuse...

Over a 50-year period, the Soviet Union and United States developed largest nuclear weapons complexes in world. In doing so, they also created world's inventories of radioactive waste. Although some waste has been stored safely managed systems such as tanks or converted into stable storable forms glass, significant amounts it have released environment. This article focuses primarily on these weapons-related discharges because their size less-well-known nature.

Studies have been made on the effect of pressure to 170 kbar electronic structure protoprophyrin IX, several hemiporphyrins, and related compounds using optical absorption Mössbauer resonance. The peaks which correspond π–π* transitions shifted lower energy decreased in intensity with increasing pressure. This could be explained terms changes configuration interaction involving a shift electrons outer portions porphyrin ring. Imidazole protohemichrome is low spin ferric compound. At room...

The optical properties of phenazine, 5,10-dihydrophenazine, 1: 1 phenazhydrin, and 3: phenazhydrin have been investigated, ir, uv, diffuse reflectance spectra are reported. ir data indicate that the structures phenazhydrins resemble those parent compounds. uv spectrum 5,10-dihydrophenazine has a Λ max at 350 nm, which is not in agreement with previously reported value 325 nm. Absorption reduced phenazine were also obtained via subtraction technique. visible region present solution observed...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA Study of the Feasibility Iron Hollow Cathode as a Multi-Element Atomic Absorption Unit.C. W. Frank, G. Schrenk, and C. E. MeloanCite this: Anal. Chem. 1966, 38, 8, 1005–1008Publication Date (Print):July 1, 1966Publication History Published online1 May 2002Published inissue 1 July 1966https://pubs.acs.org/doi/10.1021/ac60240a016https://doi.org/10.1021/ac60240a016research-articleACS PublicationsRequest reuse permissionsArticle...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCarbon-13 nuclear magnetic resonance spectral analysis of tetracycline hydrochloride and related antibioticsG. L. Asleson C. W. FrankCite this: J. Am. Chem. Soc. 1975, 97, 21, 6246–6248Publication Date (Print):October 1, 1975Publication History Published online1 May 2002Published inissue 1 October 1975https://pubs.acs.org/doi/10.1021/ja00854a051https://doi.org/10.1021/ja00854a051research-articleACS PublicationsRequest reuse permissionsArticle...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEstimation of extractable n-nitroso compounds at the parts-per-billion levelG. S. Drescher and C. W. FrankCite this: Anal. Chem. 1978, 50, 14, 2118–2121Publication Date (Print):December 1, 1978Publication History Published online1 May 2002Published inissue 1 December 1978https://pubs.acs.org/doi/10.1021/ac50036a042https://doi.org/10.1021/ac50036a042research-articleACS PublicationsRequest reuse permissionsArticle Views64Altmetric-Citations12LEARN...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of added electrolyte on the binding tetracycline to paramagnetic ion probes. A carbon-13 and proton nuclear magnetic resonance studyJanet Gulbis, Grover W. Everett Jr., C. FrankCite this: J. Am. Chem. Soc. 1976, 98, 5, 1280–1281Publication Date (Print):March 1, 1976Publication History Published online1 May 2002Published inissue 1 March 1976https://pubs.acs.org/doi/10.1021/ja00421a049https://doi.org/10.1021/ja00421a049research-articleACS...

The effect of pressure to 180 kbars on the electronic structure 12 ferric β-diketone complexes has been measured by means Mössbauer resonance and optical absorption. systematic variation electron donor acceptor properties ligands permits a more detailed interpretation results than in previous studies. These are correlated with isomer shift Fe(III), that Fe(II) produced under pressure, change shifts pressure. degree conversion Fe(III) correlates well thus changes ligands. Optical absorption...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTXenon-mercury arc as a continuous source for atomic absorption spectrometryClyde William. Frank, William G. Schrenk, and Clifton E. MeloanCite this: Anal. Chem. 1967, 39, 4, 534–536Publication Date (Print):April 1, 1967Publication History Published online1 May 2002Published inissue 1 April 1967https://pubs.acs.org/doi/10.1021/ac60248a020https://doi.org/10.1021/ac60248a020research-articleACS PublicationsRequest reuse permissionsArticle...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDetermination of s-triazine herbicide residues in urine: studies excretion and metabolism swine as a model to human metabolismMitchell D. Erickson, C. W. Frank, Donald P. MorganCite this: J. Agric. Food Chem. 1979, 27, 4, 743–746Publication Date (Print):July 1, 1979Publication History Published online1 May 2002Published inissue 1 July 1979https://pubs.acs.org/doi/10.1021/jf60224a006https://doi.org/10.1021/jf60224a006research-articleACS...