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.     

Learning, multiple equilibria, and the state: Agriculture’s role

This article will argue that the state must learn to pursue productivity enhancing rather than predatory policies if rapid long-run development is to occur in poor countries. These productivity enhancing strategies will most likely involve investment coordination. However, such coordination of investment in manufacturing is likely to fail in less developed countries as a result of low productivity in the traditional, agricultural sector. More importantly, investment coordination in agriculture is more likely to be successful especially if this is a broad based investment strategy involving the bulk of the population. In this context, the state will learn effective policies for coordinating development. Alternatively, if the agricultural sector is ignored and productivity here remains low, investment coordination in manufacturing will likely fail, and the state will learn to become a predator. Richard Grabowski is professor of economics at Southern Illinois University-Carbondale