3.7 Analysis of carbon and nitrogen isotope values in degummed cocoons Degummed cocoons showed a trend of δ 13 C and δ 15 N values similar to that of cocoons under the nine different cocooning conditions.
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Effect of cocooning conditions on the structure, carbon and nitrogen isotope ratios of silks.
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The sentences
The δ 13 C values showed a decreasing trend along the different locations of the silk fiber in the nine different groups.