The effect of epinephrine on triacylglycerol secretion was investigated in isolated rat hepatocytes. The effect appeared at concentrations of more than 1 µM and reached a plateau at 10 µM. Epinephrine concentration for half of the maximal bioeffect (EC50) was about 1 µM. Epineplrrine at a concentration of 10 µM suppressed triacylglycerol secretion by 33% and increased its cellular content b...

In this paper, we establish an equivalence between the contractible graphs with respect to the mod (2p + 1)-orientability and the graphs with K1,2p+1-decompositions. This is applied to disprove a conjecture proposed by Barat and Thomassen that every 4-edge-connected simple planar graph G with |E(G)| ≡ 0 (mod 3) has a claw decomposition.

We study the distribution of the percolation time T of 2-neighbour bootstrap percolation on [n] with initial set A ∼ Bin([n], p). We determine T up to a constant factor with high probability for all p above the critical probability for percolation, and to within a 1 + o(1) factor for a large range of p.

Given a set S of n disjoint line segments in R, the visibility counting problem (VCP) is to preprocess S such that the number of segments in S visible from any query point p can be computed quickly. This problem can trivially be solved in logarithmic query time using O(n) preprocessing time and space. Gudmundsson and Morin proposed a 2-approximation algorithm for this problem with a tradeoff be...

Many commonly-used auction mechanisms are “maximal-in-range”. We show that any maximalin-range mechanism for n bidders and m items cannot both approximate the social welfare with a ratio better than min(n,m) for any constant η < 1/2 and run in polynomial time, unless NP ⊆ P/poly. This significantly improves upon a previous bound on the achievable social welfare of polynomial time maximal-in-ran...