The second virial coefficients of equimolecular mixtures of carbon dioxide with nitrogen, oxygen, carbon monoxide, argon and hydrogen have been measured at 30°, 60" and 90" C. For all these mixtures the derived values of the interaction virial coefficient BIZ are not very different from those calculated using the empirical combining laws for the force constants in the Lennard-Jones potential, but are appreciably less dependent on temperature.I n calculating the coefficients of interaction between mixtures of non-polar gases, empirical combining laws are used to relate the force constants between unlike molecules to those between like molecules.
The volatile compounds in soursop (Annona muricata L.) were obtained by a liquid-liquid continuous extraction procedure from the aqueous solution of blended soursop pulp and analyzed by gas chromatography (GC) and GC-mass spectrometry (MS). Twelve volatiles were identified by comparing their mass spectra and Kovats retention indexes with those of standard compounds: five were identified tentatively from MS data only, eight are being reported for the first time. (Z) -3-hexen-l-ol was the main volatile present in mature-green fruit, while methyl (E) -2-hexenoate, methyl (E) -2-butenoate, methyl butanoate, and methyl hexanoate were the four main volatiles present in ripe fruit. Concentrations of these five volatiles decreased and several other unidentified volatiles appeared when the fruit became overripe.
This study examined the validity of MMPI scores and MMPI-based cognitive complaints as indicators of memory and concentrational disturbances in 70 closed-head-trauma patients. The relation of scores on the MMPI Depression (D), Schizophrenia (Sc), Mental Dullness (D4), Lack of Ego Mastery, Cognitive (Sc2A), and Organic Symptoms (Org) scales to actual memory performance on the WA1S-R Digit Span and Wechsler Memory Scale (Russell's revision) subtests was explored. The results suggest an absence of any relation between actual memory performance on any of these subtests and MMPI scores or a Cognitive Complaint Index consisting of 8 MMPI items. Findings are discussed in light of the questionable validity of memory complaints in other samples, as well as possible limitations in the ecological validity of current tests of memory.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.