An influence of visual field disorders on sorting performance in the FM 100-hue test is reported. Patients with left-sided field disorders performed worse in the conventional testing direction, i.e. ...from left to right, compared with patients with right-sided defects. Reversing the direction of sorting led, however, to a similar impairment in patients with right-sided field defects. Observations in normals tested under different conditions of hue sorting support the view that the difference obtained cannot be accounted for by a hemisphere difference in colour processing but by the strategy adopted by subjects.
This paper presents a search for radio transients at a frequency of 73.8 MHz (4 m wavelength) using the all-sky imaging capabilities of the Long Wavelength Demonstrator Array (LWDA). The LWDA was a ...16-dipole phased array telescope, located on the site of the Very Large Array in New Mexico. The field of view of the individual dipoles was essentially the entire sky, and the number of dipoles was sufficiently small that a simple software correlator could be used to make all-sky images. From 2006 October to 2007 February, we conducted an all-sky transient search program, acquiring a total of 106 hr of data; the time sampling varied, being 5 minutes at the start of the program and improving to 2 minutes by the end of the program. We were able to detect solar flares, and in a special-purpose mode, radio reflections from ionized meteor trails during the 2006 Leonid meteor shower. We detected no transients originating outside of the solar system above a flux density limit of 500 Jy, equivalent to a limit of no more than about 10^{-2} events/yr/deg^2, having a pulse energy density >~ 1.5 x 10^{-20} J/m^2/Hz at 73.8 MHz for pulse widths of about 300 s. This event rate is comparable to that determined from previous all-sky transient searches, but at a lower frequency than most previous all-sky searches. We believe that the LWDA illustrates how an all-sky imaging mode could be a useful operational model for low-frequency instruments such as the Low Frequency Array, the Long Wavelength Array station, the low-frequency component of the Square Kilometre Array, and potentially the Lunar Radio Array.
The induction was studied of sister-chromatid exchanges in gill and testis of fish exposed to Rhine water. The eastern mudminnow, Umbra pygmaea, was chosen because the usefulness of this species with ...a karyotype of 22 large chromosomes had been demonstrated in cytogenetic mutagenicity testing. Fish exposed to Rhine water for 3 and 11 days showed a 2-fold and 3-fold higher SCE rate resp., compared with fish exposed to ground water of drinking water quality. There was no difference in SCE rate between gill and testicular cells before and after exposure. GLC/MS analysis indicated that different classes of chemical compounds may be involved in the cytogenetic effects found in fish. The mudminnow has proved to be a useful fish species for biological monitoring of mutagens in polluted waters. The SCE test may be a suitable test system to prescreen their mutagenic potential.
La fête de Noël est communément en Allemagne un point culminant de l’année difficile à égaler. Que l’on soit de confession catholique ou protestante, que l’on soit étranger à la croyance chrétienne ...ou appartenant à une autre religion, personne n’échappe totalement à la période de Noël. À la fin de l’été, lorsque l’école reprend, les pains d’épices et les amandes de Noël dans les magasins sont les premiers signes annonciateurs de la fête. Les indices se multiplient de manière flagrante jusqu’a...
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