Thin-layer chromatography of malto-oligosaccharides.
Abstract Procedures for the separation, location and elution of malto-oligosaccharides are described. Best separations were obtained on glass plates (20 × 46 × 0.5 cm) coated with Kieselguhr G, serially developed in solvents of varying proportions of x-butanol, pyridine and water. Major zones were temporarily visualized by exposing the plates to iodine vapors. The located zones were eluted from the thin-layer plates into fiberglass filter pieces with water. Radioactivity of the zone can be determined directly by placing the filter in a toluene-based scintillation fluid and counting in a scintillation counter. After radioactivity determination, the carbohydrates can be eluted from the filter with water and quantitatively measured.
Thin-layer chromatography of carbohydrates.
Abstract Thin-layer chromatography, with its inherent simplicity of operation and sufficiently high degree of sensitivity and resolution, can, as a preliminary technique in the analysis of sugars and related compounds, replace other more sophisticated procedures such as gas-liquid and ion-exchange chromatography. Furthermore, as far as the identification of the sugar compounds is concerned, TLC is superior because it permits the use of rapid differential reactions on the layer and the utilization of other criteria such as RF values and colour variations.
Migration, Labor Mobility, and Relocation Assistance: The Case of the American Indian
This article, an example of "indirect" program evaluation, utilizes a 1/100 public use sample of American households from the 1970 U.S. census to examine family welfare levels among three categories of Indian families: (1) nonmigrant families living in traditional areas of Indian population concentration; (2) families in areas not receiving relocation assistance through the Bureau of Indian Affairs (BIA); and (3) migrant families moving to urban areas with BIA relocation assistance. The article concludes that the population of migrants receiving relocation assistance has a substantially higher level of economic welfare in both absolute and relative terms and that earnings are the principal source of increased welfare. It is suggested that such assistance might be utilized on a wider basis to assist other migrating populations.