Corrosion Generation and Cleaning Effect on Surgical Instruments with Attached Radiofrequency Identification Tags in Long-Term Usage.

Faulty cleaning of surgical instruments may lead to corrosion damage and a higher risk of surgical site infection. We have developed a method in which each instrument has an attached radiofrequency identification (RFID) tag for individual management. However, because of the structure of the instruments, a risk of corrosion from poor cleaning exists; therefore, observation during long-term usage is necessary.

The direct precursor of the pyrimidine moiety of thiamin is not urocanic acid but histidine in Saccharomyces cerevisiae.

The biosynthetic route of the pyrimidine moiety of thiamin is different in prokaryotes and eukaryotes. In prokaryotes, the pyrimidine moiety is synthesized from aminoimidazole ribonucleotide, an intermediate of purine biosynthesis, while in eukaryotes, we have reported that the N-1, C-2, and N-3 atoms of the imidazole ring of histidine are incorporated into N-3, C-4, and the amino group attached to the C-4 atoms of the pyrimidine moiety, respectively, as a unit; the rest of the atoms of the pyrimidine moiety originate from pyridoxine as a unit. It has been reported that urocanic acid, the deaminated compound of histidine, is the direct precursor of the pyrimidine moiety.

Effect of L-serine on the biosynthesis of aromatic amino acids in Escherichia coli.

It is well known that some amino acids inhibit bacterial growth. L-Serine is known to inhibit the growth of Escherichia coli by inhibition of homoserine dehydrogenase (EC 1.1.

Biosynthesis of pyridoxine in Saccharomyces cerevisiae--origin of the pyridoxine nitrogen atom differs under anaerobic and aerobic conditions.

The amide nitrogen atom of glutamine is incorporated into pyridoxine in four eukaryotes (i.e., Emericella nidulans, Mucor racemosus, Neurospora crassa and Saccharomyces cerevisiae) and two prokaryotes (i.