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The obturator canal is a short passage at the upper margin of the obturator opening in the pelvis. It transmits the obturator nerve and associated vessels toward the medial thigh. Its restricted route links pelvic anatomy to the nerve supply of thigh adductor muscles.
The mediastinum is the central compartment of the thorax between the pleural sacs. It contains the heart, major vessels, trachea, oesophagus and other structures. The lungs occupy the adjacent pleural regions, so an abnormality described as mediastinal is not automatically within lung tissue.
The aortic hiatus is the passage behind the respiratory diaphragm through which the aorta continues into the abdomen. Its location differs from the more anterior oesophageal hiatus. Separating the openings helps explain how major structures cross the thoracic-abdominal boundary along different routes.
The perineum is the region below the pelvic diaphragm between the thighs. Its anterior urogenital triangle and posterior anal region contain structures involved in urinary, reproductive and bowel functions. The region should be distinguished from the deeper pelvic cavity and from the perineal body within it.
The penis is an external organ containing the terminal urethra and erectile tissue. In human anatomy it participates in urinary outflow and reproductive delivery. Its vascular erectile mechanism is distinct from the neural and muscular coordination of ejaculation.
An exoskeleton is an external supporting or protective structure of an organism. An arthropod's chitinous exoskeleton supports muscle forces while also forming an outer barrier. Growth can therefore require a moult, linking the mechanical advantages of a rigid covering to a developmental constraint.
The human skeleton is the framework of bones that supports the body, protects organs and supplies attachment points for muscles. The axial skeleton includes the skull, vertebral column and rib cage; the appendicular skeleton includes the limbs and their girdles. Movement depends on this framework interacting with joints and tendons.
Determination of an analyte amount from the measured amount of a standardized reagent reaching a specified titration endpoint.
Checks using blanks, standards, replicate measurements and recovery experiments to assess the performance of an analytical procedure.
An alkaline tetraiodomercurate reagent used for colour-based detection and estimation of Ammonia, named after Julius Neßler.
Determination of carbon dioxide by absorption into standardized barium hydroxide and measurement of the remaining base. Barium carbonate must not be titrated as though it were residual hydroxide.
Identification of constituents or classes of constituents, distinguished from measuring their amounts.
A chemical test uses a specified reaction or response to obtain evidence about a sample. Color change, precipitate formation, gas production, or a spectral signal can be the observable.
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