[Extraction-spectrophotometric determination of copper in tablets and injections of Chinese medicine]

Cu reacts with neo-cuproin and eosin Y to form a coloured associated complex. In chloroform its apparent E value is 6.83 X 10(4) 1 mol-1 cm-1 at lambda = 544 nm. We used this system to determine the contents of trace copper in some tablets and injections of Chinese medicine. This method is simple, highly sensitive and selective.

On the generalization of the Weinbaum-Jiji bioheat equation to microvessels of unequal size; the relation between the near field and local average tissue temperatures

The extensive series of experiments reported in Lemons et al. [1] show that measureable local tissue temperature fluctuations are observed primarily in the vicinity of the 100-500 micron countercurrent vessels of the microcirculation and thus strongly support the basic hypothesis in the new bioheat equation of Weinbaum and Jiji [2] that these countercurrent microvessels are the principal determinants of local blood-tissue heat transfer. However, the detailed temperature profiles in the vicinity of these vessels indicate that large asymmetries in the local temperature field can result from the significant differences in size between the countercurrent artery and vein. Using the superposition techniques of Baish et al. [9], the paper first presents a solution to the classic problem of an unequal countercurrent heat exchanger with heat loss to the far field. This solution is then used to generalize the Weinbaum-Jiji bioheat equation and the conductivity tensor that appears in this equation to vessels of unequal size. An asymptotic analysis has also been developed to elucidate the relationship between the near field temperature of the artery-vein pair and the local average tissue temperature. This analysis is used to rigorously prove the closure approximation relating the local arterial-venous temperature difference and the mean tissue temperature gradient which had been derived in [2] using a more heuristic approach.

Microskin grafting. I. Animal experiments

This article reports a new grafting technique--microskin grafting. These experiments were carried out in rabbits, and used a small amount of autograft minced into tiny pieces and then spread on a piece of homograft. The combined autograft plus homograft was then transplanted onto the wound of a rabbit. In 12 rabbits, the microskin grafts took well and covered the wound completely in 8 rabbits. The expansion ratios of the micrografts were from 7:1 to 15:1. The healing time of the wound was from 19 to 35 days. The operation failed in 4 rabbits because of the homograft moving. Histological sections revealed that microskin grafts orientated upwards can grow well and those orientated in a lateral or downward direction can grow too. This technique is an effective procedure for repairing extensive wounds with smaller donor sites.