The matching of Friedmann-Lemaftre-Robertson-Walker space-times onto a Kasner vacuum region is investigated. We apply the Darmois junction conditions to show that a spatially flat Einstein-de Sitter region can be joined smoothly to a special case of the Kasner vacuum space-time. This result suggests an intriguing cosmological model. PACS numberk): 98.80.H~

The relative performances of fluorescence, oblique incidence reflection and phase contrast imaging techniques have been studied for the purpose of monitoring long-term cellular activity and cell viability of several types of normal and cancerous cells in cultures. Time-lapse movies of live cell imaging of untagged and green fluorescent protein (GFP) tagged cell lines are presented. Oblique incidence reflection microscopy is the simplest and least expensive method to implement, appears to be the least phototoxic to cells, and is recommended for use in long-term optical monitoring of cell viability.

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This study concerned the characteristics of a set of scores on the Goodenough-Harris test, obtained from 213 spontaneous drawings of a person, done by one child between the ages of 4.6 and 10 yr. The correlation of scores with age, the mean and standard deviation of IQs and the test-retest reliability are presented. The temporal fluctuations in mean scores and mean IQs suggested important periods of acceleration or of slowing down of development. From these data within the limitations of the results, some recommendations are made on the way the Goodenough-Harris scores should be interpreted for an individual case.