Pathologies in the sticky limit of hard-sphere-Yukawa models for colloidal fluids. A possible correction

A known `sticky-hard-sphere' model, defined starting from a hard-sphere-Yukawa potential and taking the limit of infinite amplitude and vanishing range with their product remaining constant, is shown to be ill-defined. This is because its Hamiltonian (which we call SHS2) leads to an {\it exact}second virial coefficient which {\it diverges}, unlike that of Baxter's original model (SHS1). This deficiency has never been observed so far, since the linearization implicit in the `mean spherical approximation' (MSA), within which the model is analytically solvable, partly {\it masks} such a pathology. To overcome this drawback and retain some useful features of SHS2, we propose both a new model (SHS3) and a new closure (`modified MSA'), whose combination yields an analytic solution formally identical with the SHS2-MSA one. This mapping allows to recover many results derived from SHS2, after a re-interpretation within a correct framework. Possible developments are finally indicated.Comment: 21 pages, 1 figure, accepted in Molecular Physics (2003

The shape and measurements of the forced expiratory spirograms in healthy children

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A clinical classification of the idiopathic respiratory distress syndrome of the newborn

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The history of a War Memorial Children's Hospital in Cape Town

No Abstract. South African Medical Journal Vol. 96(9) (Part 2) 2006: 854-86

A review of the respiratory distress syndrome in Cape Town

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Health care of children

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Asphyxia Neonatorum-Neurological Status at One Year Follow-Up

The neurological status at one year follow-up of a group of infants who had suffered from asphyxia neonatorum is described. The situation at the end of the first week is contrasted with that a year later

Asphyxia neonatorum - assessment of the infant at birth

Asphyxia neonatorum is defined as failure of a newborn infant to establish sustained respiration after its complete delivery. In 206 asphyxiated infants reviewed, details of the Apgar scores,  time to sustained respiration and resuscitation required, were documented. The value of each of these observations, as well as that of the heart rate and acid-base status after birth, is assessed. From the findings definite recommendations for the routine assessment of the infant at birth are made.S. Afr. Med. J., 48, 2139 (1974)