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N Levi

Publications and source records attributed to N Levi.

64 records · Page 4Linked to original sources

The role of metal ions in chemical evolution: polymerization of alanine and glycine in a cation-exchanged clay environment.

The effect of the exchangeable cation on the condensation of glycine and alanine was investigated using a series of homoinic bentonites. A cycling procedure of drying, warming and wetting was employed. Peptide bond formation was observed, and the effectiveness of metal ions to catalyze the condensation was Cu2+ greater than Ni2+ approximately Zn2+ greater than Na+. Glycine showed 6% of the monomer incorporated into oligomers with the largest detected being the pentamer. Alanine showed less peptide bond formation (a maximum of 2%) and only the dimer was observed.

Alanine↗

Two-level thoracic disc herniation.

We report a rare case of two-level thoracic disc herniation that occurred in a 48-year-old woman. She was referred with a 10-month history of pain on the right side of the thorax. On examination, she had hypoesthesia and hypalgesia in the right T6-T8 dermatomes. An MRI scan revealed a large herniated disc at the T7/8 level and a smaller herniated disc at the T6/7 level. At surgery, the unilateral transpedicular approach was used, and a large prolapse was removed at the T7/8 level. The T6/7 level was decompressed. The patient made an uneventful recovery. Six months after surgery her pain had disappeared, but she still had hypoesthesia in the right T6-T8 dermatomes.

Decompression, Surgical↗