Related Experiment Video
Updated: Nov 29, 2025
09:47
Microdissection of Black Widow Spider Silk-producing Glands
Published on: January 11, 2011
16.1K
Structure and Functions of Cocoons Constructed by Eri Silkworm
Bin Zhou1,2, Huiling Wang1,2
1College of Textile Science and Engineering (International Institute of Silk), Zhejiang Sci-Tech University, Hangzhou 310000, China.
Polymers
|November 19, 2020
Summary
Eri silkworm cocoons exhibit a unique multilayer structure with air gaps, providing excellent moisture buffering and temperature damping. Their high sericin content offers superior UV protection and antimicrobial properties compared to Bombyx mori cocoons.
Area of Science:
- Materials Science
- Biomaterials Engineering
- Textile Science
Background:
- Eri silkworm cocoons (E cocoons) are natural composite biopolymers distinct from Bombyx mori cocoons (B cocoons).
- E cocoons possess a complex multilayer structure (5-9 layers) with air gaps, cocoon coat, layer, and lining, influencing their properties.
Purpose of the Study:
- To investigate the structural characteristics of E cocoons.
- To analyze the relationship between the structure, properties, and functions of E cocoons.
- To explore bioinspiration for designing novel composite materials.
Main Methods:
- Structural analysis of E cocoons, including multilayer composition and air gap characterization.
- Tensile testing to observe fracture phenomena.
- Evaluation of moisture transmission and temperature damping capabilities.
- Assessment of ultraviolet (UV) absorption and antimicrobial properties, including UV protection factor (UPF) measurements before and after degumming.
Main Results:
- E cocoons exhibit a secondary fracture phenomenon due to the high modulus and dense structure of the cocoon lining.
- Air gaps facilitate multistage moisture transmission, providing a moisture buffer effect.
- E cocoons demonstrate significant temperature damping and UV protection, with UPF values higher than B cocoons.
- Sericin content significantly impacts the anti-UV performance, with higher concentrations in the outer layers.
Conclusions:
- The unique multilayer structure and high sericin content of E cocoons contribute to their superior protective functions.
- Understanding these structure-property-function relationships offers valuable bioinspiration for developing advanced composite materials.
- E cocoons present a promising natural material for applications requiring moisture regulation, thermal stability, and UV protection.
More Related Videos
05:36Author Spotlight: Advancing Gene Silencing Research in Silkworms with dsRNA Delivery Through Feeding Chitosan Nanoparticles
Published on: October 4, 2024
2.4K
04:41Author Spotlight: Analysis of Ovarian Anatomy in Migratory Insects to Overcome Experimental Challenges
Published on: July 14, 2023
1.9K
Related Concept Videos
00:55Fibrous Proteins
3.9K
Fibrous proteins are either long and narrow proteins or assemble to form long and thin structures. They contain repetitive units and usually consist of either alpha helices or beta sheets and, in rare cases, a mix of both. The amino acids in the primary structure often consist of repeating amino acid sequences. The role of fibrous proteins is primarily structural. Many are located in the extracellular matrix and are present in connective tissues to impart strength and joint mobility. They are...
3.9K
01:13Collagens are the Major Structural Proteins of ECM
5.2K
Three main types of fibers are secreted by fibroblasts: collagen fibers, elastic fibers, and reticular fibers. Collagen fiber is made from fibrous protein subunits linked together to form a long, straight fiber. Collagen fibers, while flexible, have great tensile strength, resist stretching, and give ligaments and tendons their characteristic resilience and strength. These fibers hold connective tissues together, even during the body's movement.
Connective tissue proper includes loose...
Connective tissue proper includes loose...
5.2K
01:19The Structure of Intermediate Filaments
5.1K
The intermediate filaments are one of three widely studied cytoskeletal filaments. They are so named as their diameter (10 nm) is in between that of microfilaments (7 nm) and the microtubules (25 nm). These filaments are highly stable and can remain intact when exposed to high salt concentrations and detergents. These filaments are responsible for providing stability and mechanical support to the cells. They also help in cell adhesion and maintaining tissue integrity.
Intermediate...
Intermediate...
5.1K
01:25Structure of Cadherins
4.2K
The cadherins were one of the first cell adhesion molecules discovered; the term “cadherins” is based on their calcium-dependent adhering properties. The first cadherins discovered on the epithelial, neuronal, and placental cells were named E-cadherin, P-cadherin, and N-cadherin, respectively. These classical cadherins share sequence and structural similarities. Other cadherins, including those involved in cell signaling, are grouped into non-classical cadherins. This...
4.2K
02:40Pollination and Flower Structure
74.5K
Flowers are the reproductive, seed-producing structures of angiosperms. Typically, flowers consist of sepals, petals, stamens, and carpels. Sepals and petals are the vegetative flower organs. Stamens and carpels are the reproductive organs.
74.5K
01:26Histology of the Large Intestine
2.4K
The large intestine, a vital component of the gastrointestinal tract, is structured with four main layers: the mucosa, submucosa, muscularis, and serosa. Each layer performs a distinct role in facilitating the smooth functioning of the large intestine.
The innermost mucosa layer comprises simple columnar epithelium, lamina propria, and muscularis mucosae. This layer is primarily populated with absorptive cells, tasked with water absorption, and goblet cells, responsible for secreting mucus to...
The innermost mucosa layer comprises simple columnar epithelium, lamina propria, and muscularis mucosae. This layer is primarily populated with absorptive cells, tasked with water absorption, and goblet cells, responsible for secreting mucus to...
2.4K