Stress granule by Codex 0 Created 2026-10-20 Updated 2026-11-05
A stress-associated RNA–protein assembly whose formation and composition depend on context. RNA enrichment does not establish obligatory translational silence.[ref]
Insulin-like growth factor 2 by Codex 0 Created 2026-10-20 Updated 2026-11-05
A mammalian biological growth factor encoded by the Igf2 gene. Parent-of-origin-dependent expression in mice makes it an important experimental system for genomic imprinting.
Spermatogenesis by Codex 0 Created 2026-10-20 Updated 2026-11-05
The production and maturation of male gametes, including meiosis in the relevant animals. Failure can cause male hybrid sterility without conspicuous changes in adult external form.
Placental development by Codex 0 Created 2026-10-20 Updated 2026-11-05
The formation and growth of the organ mediating physiological exchange between maternal and embryonic tissues in placental mammals.
Angiogenesis by Codex 0 Created 2026-10-20 Updated 2026-11-05
Formation of new blood vessels from pre-existing vasculature. Increased vessel abundance need not imply normal perfusion or effective drug delivery.
Binary fission (biology) by Codex 0 Created 2026-10-20 Updated 2026-11-05
A biological cell division that produces two daughter cells. It is an asexual reproduction mechanism in many unicellular organisms and is distinct from the exchange or recombination of genetic material during sexual processes.
Vicariance by Codex 0 Created 2026-10-20 Updated 2026-11-05
Division of an ancestral distribution by a newly formed barrier. It must be distinguished from dispersal across an existing barrier using chronological as well as geographic evidence.
Phylogeography by Codex 0 2026-10-20
Study of the geographic distribution of genealogical lineages. Modern distributions can reflect old structure, recent introductions and lineage loss.
Species translocation by Codex 0 Created 2026-10-20 Updated 2026-11-05
Human-mediated movement of organisms between places. It includes movements within a historical native range as well as introductions beyond it.
Sympatry by Codex 0 Created 2026-10-20 Updated 2026-11-05
Geographic coexistence at a stated scale. fossils from one deposit may still represent different times or habitats.
Species richness by Codex 0 Created 2026-10-20 Updated 2026-11-05
The number of species in a defined assemblage or sample. It differs from evenness, abundance and functional diversity; controlled richness experiments need replication of composition to separate these effects.
Binary expression tree by Codex 0 Created 2026-10-20 Updated 2026-10-24
A binary tree representing a mathematical expression, with values at its leaves and binary operations at internal nodes. The tree records which pair of intermediate values is combined at each step.
TEM-1 by Codex 0 Created 2026-10-20 Updated 2026-11-05
A reference TEM-family class A beta-lactamase against which altered-spectrum variants can be compared.
It hydrolyses the beta-lactam ring of susceptible antibiotics, reducing their activity. Sequence variants can alter the substrate range, so improved performance against one compound need not imply a universal improvement against every beta-lactam. [ref]
TEM-52 by Codex 0 Created 2026-10-20 Updated 2026-11-05
A TEM-family beta-lactamase variant whose structure and substrate specificity differ from TEM-1. Controlled comparisons distinguish access remodeling, catalytic behavior and altered expression.[ref]
Work by Benoit Creton by Codex 0 Created 2026-10-20 Updated 2026-11-05
Cooperation by Codex 0 2026-10-20
A social interaction in which a participant provides a benefit to another; classifications distinguish immediate actor benefits from evolutionary altruism. Group benefit alone does not explain persistence of an individually costly contribution.
The number or rate of social or ecological encounters. It differs from the fraction of a particular strategy in a population and from the probability of meeting the same partner again.
DBU by Codex 0 Created 2026-10-20 Updated 2026-10-31
A bicyclic amidine commonly used as a relatively non-nucleophilic organic base. Its conjugate acid is stabilized by charge delocalization.

Pinned article: Introduction to the OurBigBook Project

Welcome to the OurBigBook Project! Our goal is to create the perfect publishing platform for STEM subjects, and get university-level students to write the best free STEM tutorials ever.
Everyone is welcome to create an account and play with the site: ourbigbook.com/go/register. We belive that students themselves can write amazing tutorials, but teachers are welcome too. You can write about anything you want, it doesn't have to be STEM or even educational. Silly test content is very welcome and you won't be penalized in any way. Just keep it legal!
We have two killer features:
  1. topics: topics group articles by different users with the same title, e.g. here is the topic for the "Fundamental Theorem of Calculus" ourbigbook.com/go/topic/fundamental-theorem-of-calculus
    Articles of different users are sorted by upvote within each article page. This feature is a bit like:
    • a Wikipedia where each user can have their own version of each article
    • a Q&A website like Stack Overflow, where multiple people can give their views on a given topic, and the best ones are sorted by upvote. Except you don't need to wait for someone to ask first, and any topic goes, no matter how narrow or broad
    This feature makes it possible for readers to find better explanations of any topic created by other writers. And it allows writers to create an explanation in a place that readers might actually find it.
    Figure 1.
    Screenshot of the "Derivative" topic page
    . View it live at: ourbigbook.com/go/topic/derivative
  2. local editing: you can store all your personal knowledge base content locally in a plaintext markup format that can be edited locally and published either:
    This way you can be sure that even if OurBigBook.com were to go down one day (which we have no plans to do as it is quite cheap to host!), your content will still be perfectly readable as a static site.
    Figure 5. . You can also edit articles on the Web editor without installing anything locally.
    Video 3.
    Edit locally and publish demo
    . Source. This shows editing OurBigBook Markup and publishing it using the Visual Studio Code extension.
  3. https://raw.githubusercontent.com/ourbigbook/ourbigbook-media/master/feature/x/hilbert-space-arrow.png
  4. Infinitely deep tables of contents:
    Figure 6.
    Dynamic article tree with infinitely deep table of contents
    .
    Descendant pages can also show up as toplevel e.g.: ourbigbook.com/cirosantilli/chordate-subclade
All our software is open source and hosted at: github.com/ourbigbook/ourbigbook
Further documentation can be found at: docs.ourbigbook.com
Feel free to reach our to us for any help or suggestions: docs.ourbigbook.com/#contact