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.
Essential oils and their constituents : XXXII. Gas chromatography of sesquiterpene hydrocarbons☆
Abstract Characteristic gas chromatographic criteria of identity are reported for 34 authenticated sesquiterpene hydrocarbons, using Reoplex 400, silicone nitrile XE-60 and silicone rubber SE-30 as column substrates and naphthalene, 2-methylnaphthalene and acenaphthene as internal reference standards. The value of the experimental data is demonstrated by application to the analysis of essential oils and correlation with characteristic structural features of some sesquiterpenes. The occurrence of ylangene, α-bergamotene and δ-cadinene in oil of copaiba balsam is reported for the first time.
Comparative studies of α-Lactalbumin and lysozyme: Echidna lysozyme
Summaryα-Lactalbumin is a modifier protein for galactosyl transferase in the biosynthesis of lactose and lysozyme catalyses the cleavage of β(1–4) glycosidic linkages. It is now generally believed that α-lactalbumin and lysozyme have diverged from a common ancestor. Comparative studies of these proteins from several species are reported here.The presence of lactose and lactose synthetase activity is shown in mature milk samples from a variety of placental mammals (eutheria) and a pouch bearing mammal (marsupialia). The isolation of the α-lactalbumins involved and their properties are compared.The position is different in the milk samples of monotremes. The α-lactalbumin, lactose and lactose synthetase activity levels in the two platypus samples studied are very low. The levels of lactose and lactose synthetase activity in some echidna(Tachyglossus aculeatus) samples are low, but appreciable in others. No α-lactalbumin is present. The lysozyme activity is appreciable, some samples containing a different lysozyme from that present in others. One of these (designated echidna lysozyme I) is capable of lactose synthetase modifier activity in the presence of bovine “A protein”.The properties of this lysozyme are compared with those of lysozymes and α-lactalbumins from a variety of species and their significance is discussed.