Opportunities electroretinography in stadying of physiological stages of maturation human retina at different ages

The results of evaluation of the functional state of the retina in 55 healthy children of different ages (110 eyes). Distinctive features of the formation curve electroretinogram in early childhood. So in children under 6 months a-wave electroretinogram was not recorded, b-wave had a very low amplitude and increased latency. Typical configuration electroretinogramm was after 1 year of life. Noted that the maturation of cone function finishes later than the rod-function. Electroretinography objectively confirm phasing formation of functional activity of the visual system in children.

Searching for Mates Using 'Fast and Frugal' Heuristics: a Demographic Perspective

The paper deals with the search for a mate in human populations, where agents behave according to the bounded rational, 'fast and frugal' heuristics proposed by Todd (1997), which he calls Take the Next Best (TNB). The perspective is that of a demographer, and the main focus is on the macro regularities, in particular, the shape of the frequency distribution of mating time and the proportion of ever-mated, arising from the micro hypotheses. We show – both by simulation and by formal proof – that if agents behave homogeneously according to the same TNB rule the shape of the distribution is monotonically decreasing. Switching then to the hypothesis that individuals act heterogeneously, with different TNB rules, the typical shape of the union formation curve emerges. Finally, we argue that students of demography might gain important hints for their theories by simulation-based approaches and that a population-oriented focus might also be advantageous for studying the mental models for agents.

Tests to Distinguish between “True” and “Faked” Maximum Muscle Strength Exertions

A problem within the industrial setting for many years, has been that of determining whether certain injured workers were truly incapable of performing physically exertive tasks or whether they were exhibiting less than genuine exertions. Experiments were performed to provide testing criteria for this distinction. Six subjects were assigned to a “Maximal” group, and were asked to exert 50%, 75%, and 100% of their true maximum strength. Six different subjects were assigned to the “Submaximal” group and were asked to subjectively set a submaximal level of exertion and exhibit 50%, 75%, and 100% of this level. The experimenters were “blind”, in that they did not know to which group each subject was assigned. The data was analyzed to test two hypotheses. First, it was suspected that the variability of the Submaximal group would be greater, in relation to the percentage level of strength, as compared with the Maximal group. Second, the slope of the strength formation curve was believed to correlate with the percentage of true strength exerted. Significant slope-strength correlations were found, whereas, the findings of the variability were less conclusive.

Concerning the so-called "isohydric point"

Evaluation of the formation function [Formula: see text] for a system of monomeric and polymeric (condensed) acids in mutual equilibrium can account for the appearance of a network of formation curves with a crossover point at a fixed value of the coordinates [Formula: see text], pH. The value of [Formula: see text] at this isohydric point is equal to 1 − z/n, where n is the degree of condensation and z the basicity of the condensed acid. A third formation curve is unlikely to pass through the same isohydric coordinates, so that the system is very probably restricted to two predominant species in equilibrium. These conclusions confirm the work of Carpéni and collaborators, but appear to have been derived in a different way.

Chloroaquo complexes of titanium(III). The 2T2g→2Eg absorption band

If the chloride ion content of aqueous titanium(III) solutions is gradually increased there is a continuous shifting of the 2T2g → 2Eg peak from c. 20100 cm-1 to c. 14500 cm-1. By applying the rule of average environment it is possible to draw a ?formation curve? for the number of chloride ions complexed to the central titanium(III) ion and hence to determine the equilibrium constants of the successive chloroaquo complexes as chloride ion replaces water in the octahedral environment. Of these, the first, K1 = {Ti(H2O)5Cl2+}aw/{Ti(H2O)3/6+}{Cl-}, was determined to be 0.07-0.2. The reflectance spectra of purple titanium trichloride hexahydrate (TiCl3,6H2O) and a 5% solution of a-titanium trichloride in KCl-LiCl eutectic mixture at 25� are shown to give ligand field bands in agreement with the above range of wave numbers.