perfused rats

Mother of Pearl - medicine ( poison ) Bachelor of Science
Mother of Pearl perfused rats pearl layer powder LD50 > 21.5g / kg, transdermal drug delivery mother of Pearl LD50 > 31.6g / kg. With pearl layer powder mixing in feed, continuous feeding weanling rats after February, 478ppm group and 1434ppm group administration after February,pearl jewelry all did not see weight increase effect (P > 0.05 ), but in 4300ppm group, the body weight growth is affected, in male rats administered for seventh days and eighth weeks, weight average than the control group decreased significantly ( P < 0.01), in addition, male rats at 6 weeks and female rats within 8 weeks of the weight average although there are different degrees of decline, but statistically no significant differences.

The doses of 4300ppm rats lower hemoglobin, elevated blood urea nitrogen, pathological examination showed no abnormalities, but the weight increase effect. According to the Chinese general acute toxicity grading criteria, rat oral LD50 > 5000mg / kg, belongs to actually nontoxic, therefore mother of pearl should belong to the low toxicity of drugs.

Mother of Pearl - ecological environment
1 habitat pearl shell in waves than the calm bay, sediment, rocks or gravel more submarine, to foot wire fixation life in rocks or stones, with the trend of patency, quality is better in the growth of fertilizer. From the low tide line near to water depth of about 10m have growth, usually in the depths of more 5m. Bacillariophyta as staple food, comfortable and growth temperature in 15-30 C, spawning period 5-10 month, faster growth, generally 2 years is up to about 70mm shell height. 2 inhabits the intertidal zone near the low tide line, to foot attached to rocks or coral reefs within the raphe, and attached to the back wave rock base.

More than 3 inhabits water depth of about 20m in 60m area, also can be collected to the depths of.
4 habitat and distribution with the Hepu Pearl oyster.
5 live in freshwater rivers and lakes with sandy mud bottom.
6 live in the rivers, lakes and mud bottom, slow.
7 life in rivers and lakes and mud bottom.