When most people think about vacuum tubes, they picture big glass bottles glowing inside antique radios or early computers. History often treats tubes as a dead-end technology that was suddenly swe…
I have several TPU tubes that I have patched. These were pinholes, but I hesitate to rely on these as spare tubes. Anybody have experience using patched TPU tubes?
For the average rider, inner tubes have been one of the most enduring and unchanging parts of bicycle design over the decades. They’re made of rubber, they have a Schrader or Presta valve, an…
I teach undergraduate microbiology at a community college. We inoculated PR tubes for glucose, sucrose, and lactose. One of the organisms we regularly use is Pseudomonas aeruginosa. It has historically shown consistent -/- results for all three sugars.…
