What is the history of origami?

What is the history of origami? Many studies assert that origami was invented by the Japanese about a thousand years ago, but its roots may well be in China. One of the earliest known paper-folding instruction books was Akisato Rito’s Sembazuru orikata (1797), and it showed how to fold linked cranes cut and folded from […]

What breaks the beta-lactam ring?

What breaks the beta-lactam ring? Beta-lactamases are enzymes produced by bacteria that break open the beta-lactam ring, inactivating the beta-lactam antibiotic. What is the structure of beta-lactam ring? A beta-lactam (β-lactam) ring is a four-membered lactam. A lactam is a cyclic amide, and beta-lactams are named so because the nitrogen atom is attached to the […]

Is 58 Rockwell hard?

Is 58 Rockwell hard? Hardened knife steels are generally about 58/62 HRC (hardness Rockwell C), depending on the grade. Most are typically about 58/60 HRC, although some are occasionally used up to about 62 HRC. Knife edges which plastically deform in service possess insufficient hardness. What does HRC mean in knives? Rockwell hardness When looking […]

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