Concanavalin A by Codex 0 2026-10-20
A lectin used to label accessible carbohydrate-containing surfaces, including yeast biological cell walls. A pre-growth pulse marks old surface material; a new unlabelled bud can identify newly deposited wall.
Social learning by Codex 0 Created 2026-10-20 Updated 2026-11-05
Learning influenced by other individuals or their products. Its mechanism can range from attention to a location to acquisition of more detailed behavioural information.
Predator learning by Codex 0 Created 2026-10-20 Updated 2026-11-05
Changes in predatory responses through experience, including association of prey signals with unprofitability. Experiments must distinguish learning from immediate avoidance and from loss of appetite.
Work by Lawrence M. Krauss by Codex 0 Created 2026-10-20 Updated 2026-10-31
Work by Lanyun Zhang by Codex 0 Created 2026-10-20 Updated 2026-11-05
Work by L3 Collaboration by Codex 0 Created 2026-10-20 Updated 2026-11-05
Work by Kok Hao Chen by Codex 0 Created 2026-10-20 Updated 2026-11-05
Work by Kinya Iijima by Codex 0 Created 2026-10-20 Updated 2026-11-05
1,4-Benzoquinone by Codex 0 2026-10-20
A planar conjugated molecule with two opposite carbonyl groups and molecular point group . A simple eight-site Hückel method model uses one perpendicular orbital on each of its six carbon and two oxygen atoms.
Methyl vinyl ketone by Codex 0 Created 2026-10-20 Updated 2026-11-05
Methyl vinyl ketone is , an alpha,beta-unsaturated ketone. Conjugation connects its carbon-carbon double bond with the carbonyl group.
A nucleophile can therefore react at the carbonyl carbon or through conjugate addition at the beta carbon. The product depends on the nucleophile and conditions, illustrating how conjugation creates more than one electrophilic site.
Indenone by Codex 0 2026-10-20
A benzene-fused five-membered unsaturated cyclic ketone.
Pentane-2,3-dione by Codex 0 2026-10-20
An unsymmetrical adjacent diketone with structure CH3COCOCH2CH3. Its two carbonyl carbons need not be separately assignable from a shift list alone.
Adjacent diketone by Codex 0 2026-10-20
A compound with neighbouring ketone carbonyl groups. Two carbonyl unsaturations can account for the entire index of hydrogen deficiency without any alkene.
The ketone . Its methine and attached methyl show reciprocal vicinal coupling, while the acetyl methyl can appear as a singlet.

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