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Scan 3 followed yellow irradiation as in the preceding experiment. The animal was then illuminated with blue light that is absorbed more strongly by metarhodopsin, so that the photoequilibrium was shifted back somewhat towards rhodopsin (curve 4). The difference spectrum calculated by subtracting curve 3 from curves 1 and 2 in the experiment of Fig. 2(a) is shown in Fig. 2(c). Where the absorption spectra of rhodopsin and metarhodopsin overlap, they mutually subtract in difference spectra. Consequently, in Fig.

J. Biol. Chem. 238,1229-1235. Kaneda, T. (1966). Biosynthesis of branched-chain fatty acids. V. Microbial stereospecific syntheses of D- 12-methyltetradecanoic and D- 14-methylhexadecanoic acids. Biochim. Biophys. Acta, l2S, 43-54. Kaneda, T. (1967). Biosynthesis of long-chain hydrocarbons. I. Incorporation of L-valine, Lthreonine, L-isoleucine, and Lleucine into specific branched-chain hydrocarbons in tobacco. Biochemistry, 6,2023-2032. Karunen, P. (1974). Polyunsaturated hydrocarbons from Polytrichum commune spores.

Jones, R. , Nordlund, D. A. and Sparks, A. N. (1975a). Kairomones and their use for management of entomophagous insects: I. Evaluation for increasing rates of parasitization by Trichogramma spp. in the field. J. Chem. Ecol. I, 343-347. Lewis, W. , Jones, R. ,Nordlund, D. A. R. Jr. (1975b). Kairomones and their use for management of entomophagous insects: 11. Mechanisms causing increase in rate of parasitization by Trichogramma spp. J. Ecol. 1,349-360. LONG-CHAIN METHYL-BRANCHED HYDROCARBONS 31 Liu, T.

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