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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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Stress-strain curves of Gonometa postica (3A) indoor cocoon shells, (3B) outdoor cocoon shells, and (3C) degummed fibers. High quality figures are available online.
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f03_01: Stress-strain curves of Gonometa postica (3A) indoor cocoon shells, (3B) outdoor cocoon shells, and (3C) degummed fibers. High quality figures are available online.

Mentions: The mechanical properties of cocoon shells and degummed fibers from G. postica reared indoors and outdoors are summarized in Table 2. There was a highly significant difference between the tensile properties of degummed fibers from indoor and outdoor cocoons. Indoor reared degummed fibers had higher initial modulus and breaking stress (tensile strength). Degummed fibers from cocoons reared outdoors had higher breaking strain and breaking energy. However, indoor and outdoor cocoon shells showed no significant difdifference except for breaking energy (Figure 3). Outdoor cocoon shells showed a significantly higher breaking energy. The stress-strain curves of degummed fibers had a sigmoidal shape with three distinct regions: an initial linear elastic region, a yield region, and hardening regions (Figure 3C). In contrast, in the cocoon shells, the binding points between fibers were observed to break gradually, and there was a rapid fall in stress, which indicates fiber bonding in the cocoon shells was broken and simple intertwined fibers were remained (Figure 3A, B).


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

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

Stress-strain curves of Gonometa postica (3A) indoor cocoon shells, (3B) outdoor cocoon shells, and (3C) 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

f03_01: Stress-strain curves of Gonometa postica (3A) indoor cocoon shells, (3B) outdoor cocoon shells, and (3C) degummed fibers. High quality figures are available online.
Mentions: The mechanical properties of cocoon shells and degummed fibers from G. postica reared indoors and outdoors are summarized in Table 2. There was a highly significant difference between the tensile properties of degummed fibers from indoor and outdoor cocoons. Indoor reared degummed fibers had higher initial modulus and breaking stress (tensile strength). Degummed fibers from cocoons reared outdoors had higher breaking strain and breaking energy. However, indoor and outdoor cocoon shells showed no significant difdifference except for breaking energy (Figure 3). Outdoor cocoon shells showed a significantly higher breaking energy. The stress-strain curves of degummed fibers had a sigmoidal shape with three distinct regions: an initial linear elastic region, a yield region, and hardening regions (Figure 3C). In contrast, in the cocoon shells, the binding points between fibers were observed to break gradually, and there was a rapid fall in stress, which indicates fiber bonding in the cocoon shells was broken and simple intertwined fibers were remained (Figure 3A, B).

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