Kaolinites of all kinds (fine, ‘fireclay,’ ‘type IV,’ etc.), some of which do not expand or expand incompletely with the usual intercalation methods used for comparison, are expanded completely by treatment of dry (110°C) clay with dry CsCl salt, followed by contact with hydrazine for 1 day at 65°C and then with DMSO overnight at 90°C. Comparison treatments were grinding in KOAc, soaking in hydrazine, and Li-DMSO, as well as combination of these. Following the Cs-hydrazine-DMSO treatment, the 7.2 Å spacing of 1:1 dioctahedral layer silicates shifts to 11.2 Å and the 11.2 Å/(7.2 + 11.2 Å) ratio ≃1.0. The trioctahedral 1:1 layer silicates and chlorite are not expanded by the Cs-hydrazine-DMSO procedure.

The effects of four progestational drugs on the composition of human milk during the first year of lactation were studied in Egyptian women. In comparison with a group of non-medicated women, chlormadinone acetate, Depo-Provera and Deladroxone all caused a marked increase in protein content in the early stages of lactation; quingestanol acetate had little overall effect. The lipid and lactose content showed irregular changes in the medicated groups as compared with the controls.

The composition of human milk during the first year of lactation was studied. The effect of age, parity and the length of inter-delivery interval on the composition is described. Of the three parameters, the length of inter-delivery intervals was the most important, while the other two were weakly correlated. (Summary in Arabic, p. 409.)