N-Acylcysteines

Abstract

Notes(325 ized, and sterilized by free flowing steam for 10 min. Cells for thejinoculum were grown in Henderson and Snell1 23456 basal medium and harvested after 6-8 hr at 35°. E. coli.-The methods used were similar to those described6 with the exceptions that total volumes of 10 ml/50-ml erlenmeyer flask and incubation on a reciprocating shaker at 28°were employed.Testing Procedures.-Initially, all compounds were tested at final concentrations of 100, 200, 400, and 800 jug/ml, both in the absence and presence of exogenous L-cysteine hydrochloride (1.5 µ / , a level required for about half-maximal growth) with L.mesenteroides. With E. coli similar levels of compound were evaluated but only in the absence of cysteine.

Archaeological Investigations of a Shell Midden (41HR39) at De Zavala Point, Harris County, Texas

“…Handmade brick was produced at Cedar Bayou from ca. 1850 or 1865 through the earl y 1900s (Martin 1968). Burned cl ay was coll ected from the northwestern quadrant of the project area by the northern bluff of De Zavala Point (Table 10).…”

Rapid high‐yield N‐acylation of aminothiols: N‐acetylglutathione and N‐acetylhomocysteine and their thiol pKa values

“…GSH derivatives such as S ‐(4‐bromobenzyl)GSH have been N ‐acetylated by the Schotten–Baumann reaction over 1 day with a yield of only 40% N ‐acetyl‐ S ‐(4‐bromobenzyl)GSH after a number of purification steps . The disulfide cystine has also been N ‐acetylated by Ac 2 O , but to the best of our knowledge, the synthesis of N ‐AcHCys has not been reported although N ‐AcHCys thiolactone is commercially available.…”