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Hafnium is the heavier group-4 congener of zirconium. Changes in alkyl-bond energetics can change both propagation and chain-transfer rates in metallocene polymerization.
Titanium is the chemical element with atomic number 22 and symbol . It is a transition metal. A protective oxide film gives the metal good corrosion resistance. Its combination of comparatively low density and useful alloy strength explains engineering applications, while titanium dioxide is a chemically distinct oxide used in pigments and other materials.[ref]
Bromine is the chemical element with atomic number 35 and symbol . It is a halogen. Its elemental form is the reddish-brown molecular liquid near room temperature. Bromide is instead the anion , so the element and its reduced ionic form have very different chemical behavior.[ref]
Americium is the chemical element with atomic number 95 and symbol . It is a actinide. It has no stable isotopes. Americium-241 is an alpha emitter used in some ionization smoke detectors, where the radiation maintains a small electrical current that smoke particles disturb.[ref]
The existence of different structural forms of the same chemical element. Diamond and graphite are crystalline examples for carbon; molecular oxygen and ozone illustrate that allotropy need not consist only of different packing arrangements of identical molecules.
Xenon is the chemical element with atomic number 54 and symbol . It is a noble gas. Although relatively unreactive, it forms compounds such as xenon fluorides. Its chemistry demonstrates that a filled valence shell does not imply absolute inability to form chemical bonds.[ref]
A clathrate compound has a host structure with cavities containing guest atoms or molecules. The host and guest motions can have very different stiffnesses and characteristic frequencies. Cage-like germanium frameworks with metal guests provide examples with low-energy rattling modes.
Ethylbenzene is , a benzene ring carrying an ethyl substituent. It shares the formula with the xylene isomers but has different connectivity.
Conversion of its side chain to a vinyl group gives styrene, connecting a simple aromatic hydrocarbon with an important polymer starting material. Its benzylic carbon also has reactivity distinct from the ring itself.
1,4-dioxane is a six-membered cyclic ether with oxygen atoms at positions one and four, formula . It can adopt chair-like conformations analogous to those of cyclohexane.
A compound formed from metallic chemical elements, with a crystal and electronic structure distinct from a simple variable-composition metallic mixture.
A quasi-one-dimensional organic charge-transfer conductor with coupled electronic and structural ordering. A phonon anomaly near was observed as its low-temperature Peierls transition was approached.[ref]
Phonon dispersion and Kohn anomaly in TTF-TCNQ by Gen Shirane and others. Abstract: temperature-dependent phonon anomaly near 2kF
inorganic pyrophosphate contains two phosphate units joined by a phosphoanhydride linkage. Its hydrolysis can favor net nucleotide-sugar activation when the relevant reactions are coupled.
ferricyanide is a redox-active iron-cyanide complex commonly used as an external electron acceptor in biological assays. Reduction shows electron accessibility under assay conditions, not necessarily a native physiological export pathway.
isopentenyl diphosphate is an activated five-carbon precursor for isoprenoid biosynthesis. Rescue by supplied IPP identifies a bypassable metabolic requirement only when uptake and continued growth are demonstrated.
glyoxylate is a two-carbon product of isocitrate lyase and a substrate for malate synthase. Its pool size and regulatory effects depend on pathway activity and metabolic context.
Nitrite is the bent anion . It can act as an ambidentate ligand, giving N-bound nitro ligands or O-bound nitrito ligands.
Triphenylphosphine is , a neutral phosphine ligand whose phenyl substituents affect both steric demand and electronic donation.
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