E.W. Underhill letter to Charity Rotch, Bristol, 8th mo 17th

A letter containing news of family from E.W. Underhill, apparently a cousin of Charity Rotch. He writes that he has faced much discouragement in his life and feels that he is in danger of falling into error. He mentions a visit by the Rotches to their home at Harlem, perhaps when Thomas and Charity were in New York in 1821. 8" x 10" (20.3 by 25.5 cm

HPLC separation of glucosinolates from leaves and seeds of Arabidopsis thaliana and their identification using thermospray liquid chramatography/mass spectrometry

Leaf and seed extracts of Arabidopsis thaliana var. Columbia contain a large number of glucosinolates, representing close to 25% of those known to occur in nature. The glucosinolates, in the form of their desulphated analogs, are separated by reversed-phase, high-performance liquid chromatography (HPLC). Seventeen are identified using thermospray liquid chromatography/mass spectrometry (TSP LC/MS). Additional glucosinolates, present in trace amounts, are identified as isothiocyanates by electron impact and chemical ionization gas chromatography/MS (GC/MS). In total, 23 glucosinolates are detected and these include four series of homologs and analogs. Fifteen possess aliphatic side chains, of which six contain \u3c9-methylthioalkyl and six contain \u3c9-methylsulphinylalkyl side chains; eight possess aromatic side chains, of which four constitute an homologous series of benzoic acid esters and three possess 3-indolylmethyl-based structures. Sixteen of the glucosinolates are detected in Arabidopsis thaliana for the first time and three of these, 4-hydroxybutyl glucosinolate, 5-benzoyloxypentyl glucosinolate, and 6-benzoyloxyhexyl glucosinolate, represent novel plant constituents.Peer reviewed: YesNRC publication: Ye

Triunsaturated hydrocarbons, sex pheromone components of Caenurgina erechtea

(Z,Z,Z)-3,6,9-Eicosatriene and (Z,Z,Z)-3,6,9-heneicosatriene have been identified as components of the sex pheromone of the noctuid,Caenurgina erechtea (Cramer), the forage looper. Structural assignments were made on the basis of spectroscopic and chromatographic data and were confirmed by comparison with synthetic material. Flight tunnel behavioral studies demonstrated that either component, when tested individually, would elicit wing fanning responses in males; however, mixtures of the two components increased this response and were essential for initiation of upwind flight and landing. In field experiments, traps baited with either component alone captured few or no adult forage looper males while those baited with both components captured several target males.Peer reviewed: YesNRC publication: Ye