ABSTRACT
Plasma produced from ultraviolet-transmitting solid targets undergoing intense (>10(16) W/cm(2)) subpicosecond (~600 fs) ultraviolet (248 nm) irradiation have been studied under conditions for which no interfering prepulse plasma is generated. Time and spatially integrated measurements of the x-ray emission for H-like and He-like Mg and Si were found to be consistent with LASNEX calculations that model the laser-target interaction.
ABSTRACT
Early and middle latency auditory evoked potentials (EAEPs and MAEPs) were recorded from thirteen male volunteers after oral administration of either 40 mg of an ACTH 4-9 analog (ORG 2766) or placebo. Main results indicate slightly longer latencies of the later components of the EAEPs after ACTH 4-9 analog. Effects of differences in treatment were clearest with very high stimulus rates. Therefore, these effects do not lend themselves for the explanation of ACTH 4-9 analog-induced changes in long latency auditory evoked potentials of cortical origin obtained with comparatively slow stimulus rates in earlier studies. In addition, the ACTH 4-9 analog inhibited a decrease in amplitudes of the Na component of the MAEP across the session. This latter result may be in line with dishabituating actions of the peptide.
Subject(s)
Adrenocorticotropic Hormone/analogs & derivatives , Brain Stem/drug effects , Evoked Potentials, Auditory/drug effects , Peptide Fragments/pharmacology , Adolescent , Adrenocorticotropic Hormone/pharmacology , Adult , Arousal/drug effects , Double-Blind Method , Electroencephalography , Habituation, Psychophysiologic/drug effects , Humans , MaleABSTRACT
A linear diode array consisting of 512 elements was used to measure soft x rays from laser-produced plasmas. Three modes of operation were tested, with the array behind (a) low-resolution filters, (b) a high-resolution spectrograph, and (c) a collimation device. The diode array used in this work has a higher fluence threshold, less dynamic range, and poorer spatial resolution at 2 ke V than Kodak No-Screen x-ray film. However, the immediate electronic readout characteristics of diode arrays make them attractive for some applications.
