The lipids of a deep-sea hydrothermal vent archaeon, Thermococcus S 557, were isolated, purified and structurally determined. Based on acid methanolysis and spectroscopic studies, the polar lipids were shown to comprise diphytanyl glycerol and dibiphytanyl diglycerol, typical membrane lipids of Archaea. From the neutral lipids, 2,3-di-O-dihydro-14,15-geranylgeranyl glycerol was isolated. This novel ether lipid is, very likely, a close intermediate in the biosynthesis of diphytanyl glycerol diether in Archaea.

Event descriptions (ED)from 6 different days and 6 corresponding morning dream reports (DR) were obtained from 13 participants. In a within-participant matching task, 14 untrained undergraduate student judges attempted to pair 6 EDs to 6 corresponding DRs for each of6 participants. In a between-participant matching task, the same judges attempted to match 6 EDsfrom different participants to their respective DRs. For the within-participant task, a significance testfor a single mean indicated that judges were llnable to match dreams to their corresponding daily events at better than chance levels. For the between-participant matching task, however, it appears that judges were able to make pairs at significant levels but were still making on average less than 2 out of the possible 6 pairs per item. In a ranking task, two different judges read 1 ED and 6 DRs and then ranked the dreams from I to 6, 1 being most likely to be related to the ED and 6 being the least likely. Statistical tests revealed that dreams did not obtain better ranks (closer to J) when they were the correct match than when they were not. These data appear to demonstrate that independent observers are unable to detect a clear resemblance between participants' daily events and manifest dream content.

This study aimed at providing subjective frequency and imageability norms for a sample of 1,760 monosyllabic French words and thereby, increasing the pool of normative data available for research in cognitive science and language processing. The results indicate that the reliability of the estimates is high, with coefficients ranging between .93 and .99 for the frequency and imageability ratings. External validity was investigated by calculating correlations with ratings drawn from all similar studies and for which the number of shared items was sufficient. These coefficients vary between .73 and .88 for subjective frequency and between .64 and .97 for imageability. The correlation between subjective frequency and imageability in the present study was significant and relatively high (r = .64). The implications of these results for the selection of experimental stimuli for research are discussed.

All French nouns must be assigned to one of two grammatical genders: masculine or feminine. Participants used either the superordinate labels masculin/féminin or the singular indefinite articles un/une to classify French target nouns. Reaction time to the labels masculin/féminin was about 200 ms longer than to the un/une labels. When the indefinite articles were used, a single P3 peak of the event-related potential was elicited. When superordinate labels were used, a double-peaked positivity was observed. The latency of the initial P3 in the masculin/féminin trials was not significantly different from that in the un/une trials. The second positive wave peaked approximately 300 ms following the first. An explanation consistent with these data is that subjects used a two-stage process to classify the nouns appearing with superordinate labels.