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Structure and properties of silk from the African wild silkmoth Gonometa postica reared indoors.

Teshome A, Raina SK, Vollrath F - J. Insect Sci. (2014)

Bottom Line: The cocoons reared indoors showed inferior quality in weight, length, width, and cocoon shell ratio compared to cocoons reared outdoors.The total weight loss was higher for cocoon shells and degummed fibers from indoors.Rearing conditions (temperature and relative humidity), feeding method used, changes in total life span, days to molting, and spinning might have influenced the variation in the properties observed.The ecological and commercial significances of indoor rearing of G. posticaare discussed.

View Article: PubMed Central - PubMed

Affiliation: International Centre for Insect Physiology and Ecology, P.O. Box, 30772-00100, Nairobi, Kenya akebede@icipe.org.

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Thermogravimetric analysis curves for indoor- and outdoor-rea red Gonometa postica silk cocoon shells and degummed fibers. High quality figures are available online.
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f04_01: Thermogravimetric analysis curves for indoor- and outdoor-rea red Gonometa postica silk cocoon shells and degummed fibers. High quality figures are available online.

Mentions: Thermogravimetric analysis curves showed that there were no differences in the shapes of the graphs between indoor and outdoor degummed fibers and cocoon shells (Figure 4). However, differences were observed between cocoon shells and degummed fibers. Cocoon shells showed steady weight loss due to dehydration while degummed fibers had rapid dehydration followed by a period of constant weight. Cocoon shells required a higher temperature for dehydration. The weight loss due to dehydration was 12.92% and 12.99% for indoor and outdoor degummed fibers, respectively. A substantial weight loss followed the gradual decrease in weight as heating temperature increased. Degummed fibers commenced decomposition at higher temperatures. Rapid weight loss commenced at 283 and 279°C for indoor and outdoor degummed fibers, respectively. However, the rapid degradation of indoor and outdoor cocoon shells started at 246 and 253°C, respectively. Unlike the degummed fibers, cocoon shells exhibited multi-step decompositions at 483–506 and 710–730°C. The total weight losses were 87.3% and 82.1% for indoor and outdoor degummed fibers respectively, and 93.4% and 86.4% for indoor and outdoor cocoon shells, respectively.


Structure and properties of silk from the African wild silkmoth Gonometa postica reared indoors.

Teshome A, Raina SK, Vollrath F - J. Insect Sci. (2014)

Thermogravimetric analysis curves for indoor- and outdoor-rea red Gonometa postica silk cocoon shells and degummed fibers. High quality figures are available online.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4206231&req=5

f04_01: Thermogravimetric analysis curves for indoor- and outdoor-rea red Gonometa postica silk cocoon shells and degummed fibers. High quality figures are available online.
Mentions: Thermogravimetric analysis curves showed that there were no differences in the shapes of the graphs between indoor and outdoor degummed fibers and cocoon shells (Figure 4). However, differences were observed between cocoon shells and degummed fibers. Cocoon shells showed steady weight loss due to dehydration while degummed fibers had rapid dehydration followed by a period of constant weight. Cocoon shells required a higher temperature for dehydration. The weight loss due to dehydration was 12.92% and 12.99% for indoor and outdoor degummed fibers, respectively. A substantial weight loss followed the gradual decrease in weight as heating temperature increased. Degummed fibers commenced decomposition at higher temperatures. Rapid weight loss commenced at 283 and 279°C for indoor and outdoor degummed fibers, respectively. However, the rapid degradation of indoor and outdoor cocoon shells started at 246 and 253°C, respectively. Unlike the degummed fibers, cocoon shells exhibited multi-step decompositions at 483–506 and 710–730°C. The total weight losses were 87.3% and 82.1% for indoor and outdoor degummed fibers respectively, and 93.4% and 86.4% for indoor and outdoor cocoon shells, respectively.

Bottom Line: The cocoons reared indoors showed inferior quality in weight, length, width, and cocoon shell ratio compared to cocoons reared outdoors.The total weight loss was higher for cocoon shells and degummed fibers from indoors.Rearing conditions (temperature and relative humidity), feeding method used, changes in total life span, days to molting, and spinning might have influenced the variation in the properties observed.The ecological and commercial significances of indoor rearing of G. posticaare discussed.

View Article: PubMed Central - PubMed

Affiliation: International Centre for Insect Physiology and Ecology, P.O. Box, 30772-00100, Nairobi, Kenya akebede@icipe.org.

Show MeSH
Related in: MedlinePlus