Improved extraction of chlorinated hydrocarbon pesticides from animal tissues

An improved procedure Is presented whereby greater concentrations of chlorinated hydrocarbon pesticides are removed from fatty animal tissue. This procedure employs surfactants such as Span 80 and crude lecithin in the presence of petroleum ether to extract the fat and pesticide.

Lysosomes and essential fatty acid deficiency

The hydrolytic activity usually associated with lysosomes increased in the homogenates and subcellular fractions of rat liver as a result of essential fatty acid (EFA) deficiency. The proportion of the total (tissue homogenate) activity found in each subcellular fraction, however, was unchanged by EFA deficiency.Lysosomes isolated from normal and EFA-deficient rat livers differed significantly in their stability to thermal and osmotic variations. This suggested that lysosomal membranes, like other membranes, were altered by EFA deficiency.In spite of increased tissue-bound hydrolytic activity and altered lysosomal membranes, hydrolytic activity of the serum was not markedly changed in EFA deficiency. These minor changes in hydrolytic activity and in lysosomal membrane stability seemed insufficient to explain the general lesions of EFA deficiency.

Changes in Fatty acids of alfalfa roots during cold hardening

The fatty acid composition of nonhardy Caliverde and hardy Vernal alfalfa roots as a function of the hardening process was determined by gas-liquid chromatography.The fatty acid contents of nonhardy Caliverde and hardy Vernal alfalfa root tissue increased approximately 2-fold during hardening. This increase was associated with hardening but could not be used to distinguish between varieties. The fatty acid composition of the alfalfa root changed during hardening due to the preferential accumulation of polyunsaturated fatty acids. The preferential deposition of linoleic and linolenic fatty acids caused an increase in the average number of unsaturated bonds in the fatty acids. Apparently, lipid metabolism of the roots was altered during hardening.