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An ammonium group is a positively charged tetracoordinate nitrogen unit. It can arise by protonating an amine, while a quaternary ammonium group has four carbon-containing substituents and no nitrogen-bound proton to remove.
An amino group is an amine-derived nitrogen group, commonly in its unsubstituted form. Its nitrogen can accept a proton or donate an electron pair, depending on the attached framework and environment.
Attachment to an aromatic or carbonyl-containing system changes its electronic behavior. Naming an amino group does not by itself fix its protonation state at a specified pH.
Diisopropylethylamine is a sterically hindered tertiary amine base. It can remove protons and trap acid while competing relatively weakly as a nucleophile.
An amine with one organic substituent on its nitrogen atom in the ordinary neutral amine classification.
An amine with two organic substituents on its nitrogen atom in the ordinary neutral amine classification.
An amine with three organic substituents on its nitrogen atom in the ordinary neutral amine classification.
Acetamide is the amide . Donation of the nitrogen lone pair into the carbonyl system gives the carbon-nitrogen bond partial double-bond character.
Delocalization of a nitrogen lone pair into a carbonyl group, represented by neutral and charge-separated resonance contributions. It gives the C–N linkage partial double-bond character.
An N-acyl-substituted enamine. Metalated enamines are also called enamides in organometallic usage; a lithiated enamide denotes that distinct anionic form.
An N-methoxy-N-methyl amide that can form a chelated tetrahedral intermediate on organometallic addition. Controlled hydrolysis gives a ketone rather than immediate repeated addition.
Persistence of an intronic sequence in a transcript that would otherwise have been removed by RNA splicing. It can change coding potential, localization or transcript survival.
The voltage-to-current ratio of a selected Bloch eigenmode at a specified position within a periodic cell. It depends on the chosen cell boundary, unlike the cell's propagation eigenvalues. In a pass band a physical semi-infinite mode carries positive real power; in an ideal stop band its input impedance is reactive and the mode decays into the line.
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!
Intro to OurBigBook
. Source. We have two killer features:
- 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-calculusArticles 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/derivativeVideo 2. OurBigBook Web topics demo. Source. - 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.
- to OurBigBook.com to get awesome multi-user features like topics and likes
- as HTML files to a static website, which you can host yourself for free on many external providers like GitHub Pages, and remain in full control
Figure 2. You can publish local OurBigBook lightweight markup files to either OurBigBook.com or as a static website.
Figure 3. Visual Studio Code extension installation.
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. 
- Infinitely deep tables of contents:
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