Fragments E1, E2, and E3 are plasmic derivatives of fibrin encompassing the NH2-terminal region of the molecule. The first two species, but not the third, can bind to fragment DD, forming a (DD)E complex, and therefore probably contain binding sites involved in the polymerization of fibrin. For localization of these sites the structure of the fragments was determined by establishing the NH2- and COOH-terminal boundaries of the molecules and using the published amino acid sequence of fibrinogen. Fragment E1 encompasses Gly-alpha 17 to Lys-alpha 78, Gly-beta 15 to Lys-beta 122, and Tyr-gamma 1 to Lys-gamma 62, this representing the intact NH2-terminal region of fibrin. Fragment E2 is an asymmetric molecule which is lacking the sequence of Gly-beta 15 to Lys-beta 53 in one beta-chain remnant. This fragment E2 also lost Lys-beta 122 from the COOH terminal of the beta chain as compared with fragment E1. These cleavages did not affect the ability of fragment E2 to bind to fragment DD. Fragment E3 was heterogeneous, the main species encompassing Val-alpha 20 to Lys-alpha 78, Lys-beta 54 to Leu-beta 120, and Tyr-gamma 1 to Lys-gamma 53. Thus, the loss of the binding function involved in the formation of fibrin clot was associated with the removal of small fragments from all three polypeptide chains: alpha 17-19 (Gly-Pro-Arg), beta 15-53 from the remaining half of the molecule, beta 121 (Leu), and gamma 54-58 (Thr-Ser-Glu-Val-Lys).

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The possibility of wall colours mediating thermal comfort was examined. Potential colour constancy problems in previous research were eliminated by painting laboratory walls either red, blue, or white. A total of 72 male and 72 female undergraduate college students were used in the study; each subject was exposed in a carrel to one of the possible combinations of the three colours and four room temperatures, 18,22,29 and 35°C. Data from forms completed by subjects under these conditions indicated that temperature influenced personal comfort, arousal, and perceived ambient temperature, and that colour influenced personal comfort and perceived environmental quality. However, colour did not influence perceived temperat ure, suggesting that energy conservation may not be facilitated by selected wall colours.

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