Essential oil ofArtemisia scoparia
The chemical composition of the essential oil of oriental wormwood growing in Kazathstan has been investigated. Of the components of the oil, 28 have been identified, and the structure of an acetylenic hydrocarbon has been refined.
Chemical examination ofArtemisia scoparia Waldst. and Kit
Summary and Conclusion1.From the flowering heads and seeds ofArtemisia scoparia, which is the only species ofArtemisia growing in the plains of India, a lactone and an essential oil have been obtained in yields of 0·92 and 0·75 per cent. respectively.2.The lactone, which has been named “Scoparin”, has been found to have the molecular formula C16H20O5. It contains an α: β-unsaturation, one ketonic group and two methoxyl groups.3.A number of derivatives of the lactone have been prepared and analysed.
Formation and Strength of Magnesia Whiskers
The formation of single-crystal magnesia whiskers during the compressive deformation of single crystals at room temperatures is described. These whiskers can have strengths of the order of millions of pounds per square inch. They are formed during fracture as a result of the discontinuous propagation of cracks which are mechanically relieving internal stresses resulting from plastic flow