Sensitivity enhancement of ninhydrin-treated latent fingerprints by enzymes and metal salts

Lyophilized Sigma Type III trypsin has been applied to latent prints two weeks to two months old. This trypsin preparation eliminates the background problems that had been encountered with old prints in a previous study. Zinc chloride treatment of latent prints previously exposed to ninhydrin enhances their detectability upon laser examination. However, it has been reported that the zinc chloride reaction occasionally fails to occur. Accordingly, we have investigated the optimization of this reaction. We find that high humidity and elevated temperature, particularly the former, are needed. Cadmium nitrate, although it produces weaker fluorescence than zinc chloride, may at times be useful. Reaction conditions are much the same as those for zinc chloride.     

Diagnosis of sudden death in infants due to acute dehydration

When infants die suddenly of acute dehydration, clinical signs and autopsy findings may be equivocal or absent, and microbiologic cultures often are not helpful. Vitreous humor electrolyte and urea nitrogen concentrations were measured in 53 infants dying of gastrointestinal infections, sudden infant death syndrome (SIDS), other infectious diseases, and miscellaneous causes to determine whether these parameters would assist in the recognition and confirmation of deaths resulting from dehydration. Significant differences were found when comparing the mean sodium and urea nitrogen levels of infants dying of gastrointestinal infections with those succumbing to SIDS or other causes. We recommend that these determinations be routinely performed whenever the gross autopsy findings are insufficient to explain the death.     

Quantitative cross-national studies of economic development: A comparison of the economics and sociology literatures

For more than two decades, economists and sociologists have pursued parallel cross-national quantitative investigations of the determinants of economic development. These investigations have proceeded in mutual ignorance despite the often large overlap in statistical methods and data employed. Apparently contradictory findings have resulted, especially regarding the impacts of international trade and foreign direct investment. We find that there are two factors that account for these inconsistent results. One key factor is the use of different variables to measure international trade and investment, the choice of which is in turn driven by underlying differences in theoretical motivations. A second important difference involves sociologists’ greater preoccupation with more complex multivariate models versus economists’ greater willingness to focus on individual variables in multivariate regressions while viewing others as “controls.” A major finding of our survey is that when thesame variables are used, the results of economists and sociologists tend to be consistent, rather than contradictory (as might have occurred, for example, because of the use of different samples of countries or time periods, or the use of other variables included in the regression equations). We also consider some studies whose purviews go beyond economic growth to consider factors such as income inequality, physical quality of life, demographic change, and basic needs provisioning. Angela Martin Crowly is at the Department of Sociology, University of California, Irvine, Irvine, California 92717. James Rauch is at the department of Economics, University of California, San Diego, La Jolla, California 92093. Susanna Seagrave is at the U.S. General Accounting Office, Washington, D.C. 20548. David A. Smith is at the Department of Sociology, University of California, Irvine, Irvine, California 92717.     

Detection of cocaine metabolite in perspiration stain, menstrual bloodstain, and hair

Low nanogram and picogram quantities of cocaine metabolite equivalents were detected in extracts from perspiration stains, menstrual bloodstains, and hair using radioimmunoassay. The theory of drug inclusion in hair and its significance are discussed.