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It has been established that only a negligible part of fleas occurs on animals while the main habitats where the greater part of micropopulation is concentrated from April to September are mouth, passages and food chambers situated at a depth up to 60 cm. In March, October, November and December fleas are restricted to the passages of burrows at a depth over 100 cm.
The distribution of energy under a phototherapy unit containing 8 tubes is uneven; a significant maximum in energy is observed at the centre of the unit. It is therefore desirable to situate the baby at this point of maximum energy. The presence of lateral reflectors however (either metal foil or white sheets), result in not only an increase in energy, but also a more even energy distribution. Therefore the necessity of placing the baby at a special position is no longer required.
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A detailed comparison of responses of lateral geniculate neurons to local photic stimulation of central, antagonistic and disinhibiting zones of their receptive fields (RF) during local light adaptation of each zone was carried out in experiments on unanesthetized cats immobilized with d-tubocurarine. It was shown that most conditions of local adaptation of different RF zones activated neuronal on- and off-responses to stimulation of peripheral zones and depressed responses to flashes delivered to the central zone. Therefore under condition of local adaptation the geniculate neurons can produce intensive signals when photic stimulation switches on as well as switches off. The comparison of this fact with the known properties of on-off-channels allows suggesting that under condition of light adaptation the processing of large information volumes and more perfect performance of visual functions are connected with emergence of signals in different RF zones.
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Quantitative estimations of the density of localisation of propriospinal interneurons with descending transsegmental axons were obtained for the spinal cord of cat. Neurons were labelled by unilateral HRP injections at different segmental levels. Mean quantity of labelled neurons per 50 micron slice was regarded as a measure of density. The density of propriospinal neurons with the longest axons connecting cervical segments with lumbosacral ones was approximately two orders less than the density of neurons with short (up to two segments) axons and several times less than the density of neurons with axons of intermediate length. No local maxima of density of long-axon propriospinal neurons at the brachial enlargement were found. The quantity of neurons with crossed axons in most of segments reached about a half of the total number of propriospinal units. Zones of maximal concentration of propriospinal neurons with uncrossed and crossed axons of different length were defined on the cross-sections of the spinal grey at different segmental levels. Correlation of the quantitative composition of propriospinal neuronal populations with the patterns of effects transmitted by these populations are discussed.
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In the 17-th area of guinea pig's visual cortex the electric stimulation of LGN, SC, and the cortex itself creates within the zones of the column-like ensembles of neurones excited by the light flash, local excited groups, with overlapping marginal zones. Together with analogous results of the MBRF stimulation this demonstrates that different functional neuronal ensembles achieve various forms of functioning of the same structural units of the cortex structure, i.e. columns. Thus, convergence of specific, unspecific and cortico-cortical afferent influences upon individual columns take place. This phenomenon suggests a realization of a higher, as compared with cellular, level of the nervous integration by neuronal ensembles.
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