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ABC Transporters: Exporter01:31

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ATP-binding cassette or ABC transporter is the largest superfamily of integral membrane proteins. The transporters have transmembrane-binding domains (TMDs) and nucleotide-binding domains (NBDs). The TMDs are specific to their substrates, whereas the NBDs are similar to engines that complete ATP hydrolysis to complete the substrate transport. They can be full transporters consisting of two TMDs and NBDs, half transporters with one TMD and NBD, while some encoded with a single TMD or NBD are...
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After folding, the ER assesses the quality of secretory and membrane proteins. The correctly folded proteins are cleared by the calnexin cycle for transport to their final destination, while misfolded proteins are held back in the ER lumen. The ER chaperones attempt to unfold and refold the misfolded proteins but sometimes fail to achieve the correct native conformation. Such terminally misfolded proteins are then exported to the cytosol by ER-associated degradation or ERAD pathway for...
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Colombian Export Capabilities: Building the Firms-Products Network.

Matteo Bruno1, Fabio Saracco1, Tiziano Squartini1

  • 1IMT School for Advanced Studies, P.zza S. Francesco 19, 55100 Lucca, Italy.

Entropy (Basel, Switzerland)
|December 3, 2020
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Summary
This summary is machine-generated.

Colombian firms exhibit strong product specialization in exports, forming distinct clusters. This contrasts with countries, which diversify production, highlighting scale-dependent economic behavior.

Keywords:
complex networkseconomic systemsexponential random graphsinference methodsnull models

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Area of Science:

  • Economic Complexity
  • Network Science
  • International Trade

Background:

  • Analyzing the structure of economic networks is crucial for understanding international trade patterns.
  • The Colombian firms-products network provides a unique micro-level view of export specialization.

Purpose of the Study:

  • To analyze the bipartite Colombian firms-products network from 2010-2014.
  • To identify export specialization patterns and network modularity.
  • To compare the network structure with the World Trade Web.

Main Methods:

  • Bipartite modularity maximization to detect firm and product clusters.
  • Network projection to monopartite representations.
  • Application of the Louvain algorithm on projected networks.

Main Results:

  • The Colombian firms-products network exhibits a strongly modular, bi-modular structure with specialized export clusters.
  • Firms specialize in exporting limited, homogeneous product baskets.
  • The World Trade Web lacks similar block-structure, indicating scale-dependent economic behavior.

Conclusions:

  • Economic systems display different structures at the firm and country levels.
  • Firms specialize, while countries diversify, in export activities.
  • Network analysis reveals distinct characteristics of economic systems at various scales.