Topics (384k) Articles (398k) Users (410) Discussions (242) Comments (383) Files (13k) New article
Axial stereoisomerism in suitably substituted alkylidenecyclohexanes, where the constrained ring and alkene distinguish two handed arrangements.
chirality produced by distinguishable terminal substituents arranged about the constrained axis of a spiro framework.
The concentration-equivalent measure of how a tethered group is presented to a second binding site. Geometry, linker flexibility and accessibility affect the probability of forming an additional contact.
An optical halo is a ring, arc or other light pattern formed by refraction or reflection in atmospheric ice crystals. It is distinct from a dark-matter halo.
A jet with bulk velocity sufficiently close to the speed of light that relativistic aberration, frequency shifts and arrival-time effects strongly affect its appearance. The moving emitting pattern need not track the speed of every plasma component.
An inference of a compact object's gravitating mass from specified tracers and a dynamical or radiation model. Resolved stellar or gas orbits, spectroscopic binary dynamics, and reverberation mapping supply complementary approaches with different distance, geometry and equilibrium assumptions. A short variability timescale constrains size but is not a unique mass measurement.
The summatory function of an arithmetic function is . For example, the prime-counting function sums the indicator of the prime numbers, while the divisor summatory function sums the divisor function. Grouping equal values of often speeds up identities involving summatory functions.
The Liouville function iswhere is the total number of prime factors, counted with multiplicity. For example, , and . Multiplication adds prime exponents, so and for all positive integers . Thus it is a completely multiplicative function.
On square-free integers it agrees with the Möbius function. On other positive integers the distinction matters: , whereas . The Liouville function records the parity of all prime factors, rather than suppressing integers with repeated prime factors.
In Arabidopsis thaliana, it associates with small interfering RNAs that help target RNA-directed DNA methylation. Sequence complementarity supplies specificity while partner proteins connect recognition to a chromatin modification rather than cleavage of every matching transcript. [ref]
ARGONAUTE4 control of locus-specific siRNA accumulation and DNA and histone methylation by Daniel Zilberman and others. 2003, AGO4-dependent methylation and silencing
A germline nuclear Caenorhabditis elegans Argonaute required for maintenance of some inherited small-RNA-dependent silencing states.
Apical-domain regulators organized around Crumbs-family proteins and associated scaffolds. Tissue-specific interactions and dosage influence apical membrane organization.
Basolateral polarity regulators including Scribble, Discs large and Lethal giant larvae. Their interactions oppose inappropriate apical-domain expansion while supporting other tissue-specific functions.
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