Biomedical subjects
Publications and source records attributed to Z C Shi.
In the literature there are few reports on the chronic harmful effects of nickel carbonyl on the health of workers who have been exposed to relatively low levels of this gas. The purpose of this study is to determine whether some impairment of lung function could be found in such workers.
The purposes of this research are to study the changes of some projective points of vertebrae on roentgenogram during consecutive axial rotation and to design and manufacture a new rotatometer of spine for clinical and research work. Using 2 anatomic specimens of normal spines, aged 10 and 17 years. We took anteroposterior roentgenograms for each vertebra during consecutive axial rotation from 0 th 90 degrees. Some projective points on the roentgenograms were selected. Changes of the projective points were measured. The data were analysed with the stepwise regression, linear fitting in a microcomputer. The rotatometer was designed and manufactured upon the linear regressional equation. The results showed that there was an excellent correlation between actual rotation of vertebra and changes of the projective points on anteroposterior roentgenograms. The distances between the center of vertebral pedicle and lateral edge on convex side of vertebra and rotation angle Q were the reliable references which express the actual axial rotation of vertebra. We thought that rotation angle Q was the mark which had advantages of definition, directness, precision and extended measurable range. The 3 sets of graduations were used to measure the segments of T3-6, T7-12 and L1-4 neuromuscular scoliosis, some congenital scoliosis and axial rotation of spine without certain causes in adolescents. Quantitative measurement of scoliotic rotation is very important for determinating and selecting schemes of operations on scoliosis. It is also helpful to predict prognosis of scoliosis and evaluate the results of corrective operations on spinal deformity.
Six phenolic substances in bovine urine associated with oak leaf poisoning were identified by means of the ferric chloride reaction, paper chromatography and gas-liquid chromatography. The results indicate that these are neither oak tannin nor tannic acid but small molecular weight phenolic compounds. The concentration of free volatile phenols in the urine of cattle affected by oak leaves (n = 9, 26.57 +/- 11.20 mg litre-1) was significantly higher than in normal cattle (n = 9, 2.59 +/- 0.03 mg litre-1).
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