Nonpolymerizable tropomyosin, in which 11 residues have been quantitatively cleaved from the COOH terminus of muscle tropomyosin (TM) by enzymic digestion, does not bind to F-actin. Binding is restored in the presence of troponin (Tn) and absence of Ca2+. The binding is stronger than for intact TM alone and shows residual cooperativity. In the presence of Ca2+, the binding is at least 10-fold w...

Let e(Tn) be the primitive exponent of a primitive tournament Tn of order n. In this paper, we obtain the following results. 1. Let Tn be a regular or almost regular tournament of order n ≥ 7; then e(Tn) = 3. 2. Let k ∈ {n, n + 1, n + 2}. We give the sufficient and necessary conditions for Tn such that e(Tn) = k, and obtain all Tn’s such that e(Tn) = k.

Sections of formalin-fixed, paraffin-embedded tissues from 210 human breast cancers were immunohistochemically examined using the mAb against human tenascin (TN) RCB1. Immunoreactive TN was detected in the breast cancer stroma in 77 (36.7%) cases, whereas the remaining 133 (63.3%) were negative. Of the 77, 12 (5.7%) cases also showed positive staining in the carcinoma cell cytoplasm. The positi...

If Tn(x, y) is the Tutte polynomial of the complete graph Kn, we have the equality Tn+1(1, 0) = Tn(2, 0). This has an almost trivial proof with the right combinatorial interpretation of Tn(1, 0) and Tn(2, 0). We present an algebraic proof of a result with the same flavour as the latter: Tn+2(1,−1) = Tn(2,−1), where Tn(1,−1) has the combinatorial interpretation of being the number of 0–1–2 incre...