Membranous structure of purified Escherichia coli lipopolysaccharide

The ultrastructure of the purified and lyophilized endotoxin from Escherichia coli O111 was observed by ultrathin sectioning. Onion-like globular membrane structures were observed in addition to rod-like and ribbon-like structures, indicating the existence of a globular membrane structure even in the dried state.

Monomethyl-4-chloroindolyl-3-acetyl-L-aspartate and absence of indolyl-3-acetic acid in immature seeds of Pisum sativum

A new auxin-related metabolite has been isolated from immature seeds of Pisum sativum and its structure has been determined as monomethyl-4-chloroindolyl-3-acetyl-L-aspartate. Neither indolyl-3-acetic acid nor its methyl ester have been detected in immature seeds by gas-liquid chromatographic analysis.

Isolation of D-4-chlorotryptophane derivatives as auxin-related metabolites from immature seeds of Pisum sativum

Three active compounds which induce hypocotyl swelling in Phaseolus mungo were isolated from immature seeds of Pisum sativum. For purification of the compounds, our three-step procedure (counter-current distribution, Sephadex LH 20, and partition chromatography on silicic acid) were used. The chemical structures of two of the compounds were determined by synthesis to be α-N-carboethoxyacetyl- and α-N-carbomethoxyacetyl-D-4-chlorotryptophane. D-4-Chlorotryptophane is the first naturally occurring chlorinated amino acid found.