Analogous problem to the secondary structure of proteins. Likely a bit simpler due to the strong tendency for complementary pairs to bind.
This is a pre-requisite of Section "Students must have a flexible choice of what to learn".
If the choice of what to learn depend on a years long dependency graph of other obligations, which currently are the increasingly interlinked:you end up without much choice at all.
- passing the University entry exam
- getting your undergrad degree
- getting your PhD
The lock-in periods must be much more fluid and shorter term than those, otherwise it makes the almost inevitable pivots to success impossible.
This is something that Ciro Santilli has heard from several people at the end of their undergrad/PhD degrees. Some online mentions:
The weird one, not directly coded in the genetic code.
General information: Micro Bit v1
The file:contains:
/media/$USER/MICROBIT/DETAILS.TXTDAPLink Firmware - see https://mbed.com/daplink
Version: 0234
Build: Oct 12 2015 14:53:222022-10-14: stopped being able to connect to Ubuntu 22.04. Was trying to do a UART video demo, connected USB, disconnected, connected, disconnected several times on different filming attempts. Was working some of the time, Ubuntu did recognize it, I even saw UART output for sure, but was a bit unstable. But then at one point it just stopped getting recognized by Ubuntu 100% of the time. The board is still being powered by USB, and the previously flashed program still runs, but nothing showed on
sudo dmesg -w at all, and I can't reprogram it!A day later, managed to get tit to connect once more with a different cable, but just once!
[15310.385055] usb 1-5: new full-speed USB device number 38 using xhci_hcd
[15310.534996] usb 1-5: New USB device found, idVendor=0d28, idProduct=0204, bcdDevice=10.00
[15310.535000] usb 1-5: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[15310.535001] usb 1-5: Product: MBED CMSIS-DAP
[15310.535002] usb 1-5: Manufacturer: MBED
[15310.535003] usb 1-5: SerialNumber: 9900023436424e45001d30150000005d00000000cb8928bd
[15310.541267] usb-storage 1-5:1.0: USB Mass Storage device detected
[15310.541643] scsi host4: usb-storage 1-5:1.0
[15310.542658] hid-generic 0003:0D28:0204.000A: hiddev1,hidraw2: USB HID v1.00 Device [MBED MBED CMSIS-DAP] on usb-0000:00:14.0-5/input3
[15310.543121] cdc_acm 1-5:1.1: ttyACM0: USB ACM device
[15311.549969] scsi 4:0:0:0: Direct-Access MBED DAPLINK VFS 0.1 PQ: 0 ANSI: 2
[15311.550273] scsi 4:0:0:0: Attached scsi generic sg1 type 0
[15311.550825] sd 4:0:0:0: [sdb] 16512 512-byte logical blocks: (8.45 MB/8.06 MiB)
[15311.551052] sd 4:0:0:0: [sdb] Write Protect is off
[15311.551054] sd 4:0:0:0: [sdb] Mode Sense: 03 00 00 00
[15311.551204] sd 4:0:0:0: [sdb] No Caching mode page found
[15311.551207] sd 4:0:0:0: [sdb] Assuming drive cache: write through
[15311.572160] sd 4:0:0:0: [sdb] Attached SCSI removable disk
[15316.317438] usb 1-5: reset full-speed USB device number 38 using xhci_hcd
[15316.445093] usb 1-5: device descriptor read/64, error -71
[15316.681102] usb 1-5: device descriptor read/64, error -71
[15316.917102] usb 1-5: reset full-speed USB device number 38 using xhci_hcd
[15317.045028] usb 1-5: device descriptor read/64, error -71
[15317.281149] usb 1-5: device descriptor read/64, error -71
[15317.517154] usb 1-5: reset full-speed USB device number 38 using xhci_hcd
[15317.517466] usb 1-5: Device not responding to setup address.
[15317.725358] usb 1-5: Device not responding to setup address.
[15317.933042] usb 1-5: device not accepting address 38, error -71
[15318.061027] usb 1-5: reset full-speed USB device number 38 using xhci_hcd
[15318.061347] usb 1-5: Device not responding to setup address.
[15318.269270] usb 1-5: Device not responding to setup address.
[15318.477018] usb 1-5: device not accepting address 38, error -71
[15318.477153] usb 1-5: USB disconnect, device number 38
[15318.652912] usb 1-5: new full-speed USB device number 39 using xhci_hcd
[15318.785044] usb 1-5: device descriptor read/64, error -71
[15319.021068] usb 1-5: device descriptor read/64, error -71
[15319.257030] usb 1-5: new full-speed USB device number 40 using xhci_hcd
[15319.385075] usb 1-5: device descriptor read/64, error -71
[15319.621147] usb 1-5: device descriptor read/64, error -71
[15319.729170] usb usb1-port5: attempt power cycle
[15320.384941] usb 1-5: new full-speed USB device number 41 using xhci_hcd
[15320.385176] usb 1-5: Device not responding to setup address.
[15320.593188] usb 1-5: Device not responding to setup address.
[15320.801023] usb 1-5: device not accepting address 41, error -71
[15320.928909] usb 1-5: new full-speed USB device number 42 using xhci_hcd
[15320.929073] usb 1-5: Device not responding to setup address.
[15321.137244] usb 1-5: Device not responding to setup address.
[15321.344947] usb 1-5: device not accepting address 42, error -71
[15321.345173] usb usb1-port5: unable to enumerate USB device
[15321.384929] FAT-fs (sdb): unable to read boot sector to mark fs as dirtySome threads:
- askubuntu.com/questions/1317548/webusb-doesnt-work-connecting-to-microbit after system upgrade, Ubuntu sees it but fails
- askubuntu.com/questions/1288738/cannot-pair-microbit-through-usb-on-xubuntu-16
Exact same USB and port could still mount the Raspberry Pi Pico.
Forms the bacterial cell wall.
From the Wikipedia image we can see clearly the polymer structure formed: it is a mesh with:
- sugar covalent bond chains in one direction. These have two types of monosaccharide, NAM and NAG
- peptide chains on the other, and only coming off from NAM
Peptidoglycan polymer structure
. Source. 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