Selective adsorption of antirachitic sulfonated sterols

Adsorption columns of floridin, alumina, and silicic acid were used to study their capacities to concentrate the antirachitic activity in sulfonated cholesterol or two of its derivatives. Silicic acid was the most effective of these adsorbent materials. It proved more useful in adsorptions from ethylene chloride than from water suspensions.Silicic acid columns adsorbed acid fractions of sulfonated cholesterol in intermediate areas of color. These could be concentrated to a maximum of 50,000 A.O.A.C. units/g. by repeated elution, drying, and readsorption.Methylation of the active material prevented its adsorption.Similar results were obtained from sulfonated 3,4-diacetoxy-Δ⁵-cholestene but not from its isomer 3,6-diacetoxy-Δ^8,9-norcholestene.     

The taxonomy,genetics, production and uses of the cultivated species ofCucurbita

Hundreds of varieties in the five reco?nized species of this ?enus, all native to the Americas, are the sources of the well known pumpkins and squashes, of which about 150,000 tons, fresh wei?ht, in 481/2 million No. 2 cans, is the annual canned pack alone in the United States. The seeds constitute a potential but so far wholly undeveloped source of valuable oil.