In an attempt to determine whether ironfortified infant formulas produced gastrointestinal symptoms in infants, we fed two similar formulas, one with and one without iron fortification, to a group of 93 term infants upon discharge from the nursery on the third day of life. Infants were fed the formulas for a period of 42 days while their mothers kept detailed daily records of all gastrointestinal symptoms. A total of 49 infants were fed the non-iron-fortified formula and 44 infants were fed the iron-fortified formula. Review of the records revealed no differences in the number of stools per day, the description of the stools, the number of days without stools, the incidence or frequency of colic, spitting-up, or vomiting. We conclude that the feeding of iron-fortified formulas to infants does not produce an increased incidence of gastrointestinal symptoms or signs.
Critical flaw sizes in ceramic turbine parts are very small, especially for dynamic applications. Detection of these small ( < 30 pm) internal flaws are almost exclusively in the realm of ultrasonics, wherein 30 to 100 MHz test frequencies are required. Satisfactory transducers for this purpose are not available from commercial suppliers. These devices are now being developed and will be discussed together with problems of signal strength, focussing, penetration and defect signal characterization in ceramics containing both real and artificial defects.
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