Effects of Band Population on the Magnetooptical Propertiers of the Lead Salts

1969 ◽  
pp. 90-125 ◽  
Author(s):  
E. D. Palik ◽  
D. L. Mitchell
Keyword(s):  
Lead Salts

Lead aspartate: a new en bloc stain for electron microscopy

1978 ◽  
Vol 36 (2) ◽  
pp. 34-35
Author(s):  
J.R. Walton
Keyword(s):  
Electron Microscopy ◽  
Calcium Ion ◽  
Enzyme Reaction ◽  
Lead Citrate ◽  
Reaction Products ◽  
En Bloc ◽  
Thin Sections ◽  
Lead Salts ◽  
Thin Sectioning ◽  
High Alkalinity

In electron microscopy, lead is the metal most widely used for enhancing specimen contrast. Lead citrate requires a pH of 12 to stain thin sections of epoxy-embedded material rapidly and intensively. However, this high alkalinity tends to leach out enzyme reaction products, making lead citrate unsuitable for many cytochemical studies. Substitution of the chelator aspartate for citrate allows staining to be carried out at pH 6 or 7 without apparent effect on cytochemical products. Moreover, due to the low, controlled level of free lead ions, contamination-free staining can be carried out en bloc, prior to dehydration and embedding. En bloc use of lead aspartate permits the grid-staining step to be bypassed, allowing samples to be examined immediately after thin-sectioning.Procedures. To prevent precipitation of lead salts, double- or glass-distilled H20 used in the stain and rinses should be boiled to drive off carbon dioxide and glassware should be carefully rinsed to remove any persisting traces of calcium ion.

scholarly journals The formation and constitution of crystals of lead salts containing water-soluble colloid

1935 ◽  
Vol 235 (749) ◽  
pp. 125-164 ◽  
Keyword(s):  
Selective Adsorption ◽  
Water Soluble ◽  
Lead Salts ◽  
The Subject ◽  
As If ◽  
Saturated Solutions

The influence of small amounts of dissolved foreign substances on the growth of crystals from saturated solutions has been the subject of much investigation. Usually the added substances have been electrolytes. Dyestuffs have not been neglected, but with some few exceptions comparatively little attention has been given to the effect of non-ionized water-soluble electrolytes such as gelatine or dextrine. As a rule, the presence of the foreign substances is found to cause the crystals to assume a different habit. Whenever this occurs the absorption must have occurred on certain crystal-faces in preference to others, but, although the added material is active by virtue of its close attachment to such faces, it is rarely found to be incorporated into the solid to any great extent. The growing crystals appear to reject the impurity—thrusting it outwards as the growth advances. The action of water-soluble colloids on the halides and certain other salts of lead is exceptional in several ways. Although when such colloids are present in small concentrations one can generally observe a modification of habit, at higher concentrations there may be little selective adsorption, and the result may be a rounded crystal on which no plane faces at all can be distinguished, as if the forces by which atoms are attracted to the structure had been equalized in every direction.

scholarly journals A Mixed-metal Mixed-halide Complex Prepared from Zerovalent Copper and Lead Salts: Solution and Solid-state Chemistry

1999 ◽  
Vol 23 (11) ◽  
pp. 670-671
Author(s):  
Larisa A. Kovbasyuk ◽  
Olga Yu. Vassilyeva ◽  
Vladimir N. Kokozay ◽  
Wolfgang Linert ◽  
Paul R. Raithby
Keyword(s):  
Solid State ◽  
Direct Interaction ◽  
Solid State Chemistry ◽  
X Ray ◽  
Mixed Metal ◽  
X Ray Crystallography ◽  
Halide Complex ◽  
Layer Arrangement ◽  
Lead Salts

The mixed-metal mixed-halide complex [CuPbBrlL2]2 has been prepared by the direct interaction of zerovalent copper with lead halides and 2-dimethylaminoethanol (HL) in dmso and has been characterized by X-ray crystallography; the structure shows a layer arrangement of the tetranuclear metal units through the μ3-halogen bridging.

SEMICONDUCTOR MATERIALS | Lead Salts

2005 ◽  
pp. 385-392
Author(s):  
G. Bauer ◽  
G. Springholz
Keyword(s):  
Semiconductor Materials ◽  
Lead Salts

Quantitative Determination of Sorbitol in Raisins and Dietetic Foods by Gas-Liquid Partition Chromatography

1973 ◽  
Vol 56 (5) ◽  
pp. 1267-1269
Author(s):  
Enrique Fernandez-Flores ◽  
Victor H Blomquist
Keyword(s):  
Organic Acids ◽  
Quantitative Determination ◽  
Rapid Method ◽  
Internal Standard ◽  
Trimethylsilyl Derivative ◽  
Partition Chromatography ◽  
Lead Salts

Abstract A rapid method for the determination of sorbitol in raisins and dietetic foods is described. Sorbitol is converted to a trimethylsilyl derivative after precipitation of interfering organic acids as lead salts and determined by GLC, using α-d-glucoheptose as an internal standard. Nine samples of dietetic foods were analyzed. The results compared satisfactorily with the declared sorbitol content for each product. The recovery of 0.5% sorbitol added to raisins was 93%.

Lead Salts of 2,4,6-Trinitroresorcinol

1954 ◽  
Vol 76 (3) ◽  
pp. 816-819 ◽  
Author(s):  
Ralph A. Zingaro
Keyword(s):  
Lead Salts
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