Tumor of the carotid body

Clinical and X-ray examinations for hip dysplasias in 500 babies in one ward showed 40% wrongly positive and 5.6% wrongly negativ (silent or masked) results, control of which necessiates roentgenograms in the second or third month or coltrolled spreading immediately after birth.     

The colposuspension operation for urinary incontinence

Forty-two patients with urinary incontinence and related symptoms were treated by colposuspension. Two patients were lost to follow-up and the results of surgery in the remaining 40 patients are presented and discussed. The place of vaginal surgery in women with urinary symptoms is also discussed.     

New standards for the assessment of sella turcica volume in children

New standards for the assessment of sella turcica volume were derived from studies in normal children. Use of these standards facilitates the diagnostic evaluation of children with short stature, since many patients with idiopathic hypopituitarism have abnormally small sella turcica volumes. The sellar volume should be estimated early in the evaluation of the short child and, if found to be small, should serve as a stimulus for prompt, thorough evaluation of pituitary function.     

Phospholipid composition of Culex quinquefasciatus and Culex tritaeniorhynchus cells in logarithmic and stationary growth phases

Culex quinquefasciatus and Culex tritaeniorhynchus cells were grown in spinner culture and harvested in logarithmic and stationary phases of growth. The phospholipids were extracted from the cells, and the fatty acid profiles of the phospholipid classes were determined and compared. The major components were phosphatidylcholine and phosphatidylethanolamine, constituting greater than or equal to 80% of the phospholipid. The fatty acid profiles of lysophosphatidylcholine, phosphatidylinositol, and cardiolipin showed changes with aging of the Culex cells and between the species. In the lysophosphatidylcholine fraction, there was an increase in saturation of the fatty acids of the C. quinquefasciatus cells, and chain lengthening occurred in both species from the logarithmic to stationary phases of growth. In the phosphatidylinositiol fraction, both Culex species showed a decrease in monoenes and an increase in polyenes, while only the C. tritaeniorhynchus cells showed an increase in fatty acid chain length with aging. The C. quinquefasciatus cells had an increase in polyenes with aging in the cardiolipin fraction. Differences in the percentage composition of the fatty acids were shown in all the phospholipid fractions between the Culex species in the logarithmic phase of growth and all except the phosphatidylinositiol and cardiolipin fractions in the stationary phase.     

DISPERSION IN DISORDERED POROUS MEDIA

We report results of Monte Carlo investigations of dispersion in one- and two-phase flow through disordered porous media represented by square and simple cubic networks of pores of random radii. Dispersion results from the different flow paths and consequent different transit limes available to tracer particles crossing from one plane to another in a porous medium. Dispersion is found to be diffusive for the process simulated, i.e., a concentration front of solute particles can be described macroscopically by a convective diffusion equation. Dispersivity in the direction of mean flow, i.e., longitudinal dispersivity, is found to be an order of magnitude larger than dispersivity transverse to the direction of mean flow. In two-phase flow, longitudinal dispersivity in a given phase increases greatly as the saturation of that phase approaches its percolation threshold; transverse dispersivity also increases, but more slowly. As the percolation threshold is neared, the backbone of the sublatlice occupied by the phase becomes increasingly tortuous, with numerous subloops which provide alternate particle paths that are evidently highly effective in dispersing a concentration front of tracer particles.