Stated in the following are the findings of the studies made on the tissue-culture of the vesical mucosa of rabbit.
1. Rabbit serum obtained by usual method showed pH of 8.22 ± 0.17 and there was a slight increase by storage on the 7th day.
2. Heparin added plasma of rabbit showed pH of 8.15-8.37 and the same of chicken 8.17-8.41. They showed an increase of 0.12 and 0.27 respectively by storage on the 7th day. Mixture of the two kinds of plasma showed pH of 8.25±0.02.
3. Embryo extract prepared from the eggs of 7-9 days of embryonation by adding an equal amount of Ringer's solution showed pH of 6.61-6.65 without demonstrating any appreciable changes by storage on the 7th day.
4. Culture medium containing Ringers's solution, rabbit serum and embryo extract in a ratio of 2 : 2 : 1 showed pH of 7.69-7.79 without demonstrating appreciable changes for a period of 7 days.
5. Changes observed on pH of the buffered (1/10 N KH
2PO
4, 1/10 N Na
2HPO
4, 1/10 N HCl) Ringer's solution, Tyrode's solution and the culture medium were as shown in Tables 9-17, namely, though there were slight changes on the 3rd day of storage, there were no appreciable changes until cn the 7th day.
6. Culture medium containin 5 % of the buffer solution showed no appreciable changes in pH in spite of the storage at varying temperatures of 20°, 30° and 38°C for a period of 7 days.
7. Influence of the buffer solution on the growth of the vesical mucosa was as follows :
a. When Ringer's solution was used as culture medinm, 11% growth was observed by the addition of 1/10 N KH
2PO
4 to a concentration of 1% and only 1% growth by the addition of 1/10 N Na
2HPO
4 to a concentration of 10%. No growth was rccognized with the buffer of higher concentrations. Addition of 1/10 N HCl completely inhibited the membranous growth of the mucosa.
b. When Tyrode's solution was used, the addition of 1 and 5% of 1/10 N KH
2PO
4 yielded the growth of 11-2% growth respectively, addition of 1, 5 and 10% of Na
2HPO
4 yielded the growth of 12, 5 and 2% and the addition of 1% 1/10 N HCl yielded the growth of 7%.
c. When the mixture of Ringer's solution, rabbit serum and embryo extract was used, the addition of 1, 5 and 10% of 1/10 N KH
2PO
4 yielded the growth of 18, 7 and 1% respectively, the addition of 1, 5 and 10% of 1/10 N Na
2HPO
4 yielded the growth of 16, 9 and 4% and the addition of 1% 1/10 N HCl yielded the growth of 9%. But the addition of buffer in higher concentrations inhibited the membranous growth of the mucosa.
8. Results of the tissue-cultures made by the use of above mentioned 3 kinds of culture media showed that the growth was 32-39% when the mixed culture medium was used, it was 26-28% when Ringer's solution was used and 18-28% when Tyrode's solution was used. Namely, the best growth was observed when the mixed culture medium was used.
9. Growth of the cells in the medium containing buffer was inferior to the one in the medium without and it is considered to be due to the growth inhibitory influence of the buffer.
10. Optimal pH for the growth of the vesical mucosa of rabbit was 7.5-8.1 though it showed proliferation at a vast pH range of 6.0-8.8.
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