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Cooperative Allosteric Transitions01:58

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Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...
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The correlation coefficient, r, developed by Karl Pearson in the early 1900s, is numerical and provides a measure of strength and direction of the linear association between the independent variable x and the dependent variable y.
If you suspect a linear relationship between x and y, then r can measure how strong the linear relationship is.
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Proteins can undergo many types of post-translational modifications, often in response to changes in their environment. These modifications play an important role in the function and stability of these proteins. Covalently linked molecules include functional groups, such as methyl, acetyl, and phosphate groups, and also small proteins, such as ubiquitin. There are around 200 different types of covalent regulators that have been identified.
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The Multifaceted Benefits of Protein Co-expression in Escherichia coli
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Kea cooperate better with sharing affiliates.

Raoul Schwing1,2, Elodie Jocteur3,4, Amelia Wein3

  • 1Comparative Cognition, Messerli Research Institute, University of Veterinary Medicine, Medical University of Vienna, University of Vienna, Vienna, Austria. raoul.schwing@vetmeduni.ac.at.

Animal Cognition
|July 31, 2016
PubMed
Summary
This summary is machine-generated.

Kea birds showed increased cooperation when socially affiliated, but like some other birds, did not grasp the cooperation task mechanism. Reward sharing influenced future cooperation attempts in this study of avian social behavior.

Keywords:
AffiliationCooperationKeaLoose-string paradigmParrotReward division

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Area of Science:

  • Comparative psychology
  • Avian behavior
  • Evolutionary biology

Background:

  • Intraspecific cooperation studies reveal cross-taxa similarities and differences.
  • Comparisons across species like primates, fish, and birds offer insights into cooperation's evolution.
  • Data on avian cooperation, particularly in birds, remains less extensive than in primates.

Purpose of the Study:

  • To investigate cooperation in the New Zealand kea (a psittaciform bird) using a dyadic cooperation task.
  • To examine the influence of social affiliation and reward division on cooperation attempts and success.
  • To compare kea cooperation abilities with those of other taxa, including primates and other birds.

Main Methods:

  • A loose-string cooperation task was employed with kea subjects in separate compartments.
  • Ten kea individuals were tested in 44 partner combinations, allowing for examination of reward division.
  • Social affiliation scores and reward distribution were recorded to analyze their impact on cooperation.

Main Results:

  • Dyads with higher affiliation scores cooperated more frequently and successfully.
  • More equal reward sharing correlated with a higher likelihood of attempting cooperation in subsequent trials.
  • Kea, similar to other birds and some monkeys, did not spontaneously understand the partner's role or the task mechanism, unlike chimpanzees.

Conclusions:

  • Social bonds and equitable reward distribution appear to influence cooperation in kea.
  • The observed lack of spontaneous task understanding may indicate species-specific differences or be influenced by task design and experience.
  • Further research is needed to fully elucidate the cognitive mechanisms underlying cooperation in birds.