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Biomedical subjects

R B Reed

Publications and source records attributed to R B Reed.

48 records · Page 3Linked to original sources
PubMed1976

Preservation of encysted polytomella.

Cysts of Polytomella parva and Polytomella caeca were recovered after 7 days storage at cryogenic temperatures following drying on shredded filter paper, silica gel or without added substrate. Accelerated storage testing, by exposing dried material to elevated temperatures, indicated that shredded filter paper was the best of the substrates tested. Polytomella parva was recovered after 5 years storage at -30 degrees C when dried on filter paper but not when dried on silic agel. Determinations of the number of cysts recovered indicated that viable cysts survived all conditions of storage tested. However, excystment following storage was delayed, the extent depending on storage conditions and the substrate used for drying. Most rapid recovery occurred when cysts were rehydrated immediately after drying, and after storage on filter paper at below -70 degrees C.

Animals↗
PubMed1975

Nutritional correlates of child development in southern Tunisia. IV. The relation of deciduous dental eruption to somatic development.

Deciduous dental eruption in a group of 658 children below 3 years of age in Southern Tunisia was found to be correlated with the general somatic development. On the other hand, this association was less close than that among the different components of somatic growth, suggesting that dental eruption is less affected by the factors which delay somatic growth in that area. Attempts were made to obtain methods of estimating the ages of children using the number of erupted deciduous teeth, both by means of regression equations and by a table of the median age of children with different numbers of pairs of teeth. In both cases the estimates obtainable are not accurate enough to do more than divide the children into coarse age groups. It is concluded that in anthropometric work there is no substitute for accurately known chronological ages.

Age Determination by Teeth↗
PubMedDate not supplied

Longitudinal growth standards for preschool children.

The appropriateness of a preschool child's size at a particular age is usually assessed by comparing the child's measurement against growth charts. When the child has measurements at more than one age, the child's percentile status at one age is sometimes compared with the percentile status at a subsequent age, with the purpose of assessing the child's pattern over time or growth rate. This second use of growth charts is not entirely appropriate, for it assumes a high degree of 'tracking' in the population. Healthy children frequently cross percentile lines, the amount of shifting depending upon the age range under consideration, the child's sex, and whether the measurements are length or weight. Thus the correct evaluation of percentile-level changes over time is difficult. We present here conditional standards for length and weight in preschool children, which assess a child's length or weight taking into account previous measurements and/or a current measurement of a second anthropometric variable. The approach can be very flexible as regards ages of measurement, although complete flexibility requires use of a computer. In addition to its clinical application, this approach can be used to predict the future size of a child and may be valuable as an analytic tool in research situations in which control populations are not feasible.

Age Factors↗