Since the phytochrome in seedlings grown in (larkness is entirely in the red-absorbing (Pr) form, it is reasonaible to suppose that the morphogenetic effects of red light are due to formation of the farred-absorbing (Pfr) form (4). This hypothesis can be studied by briefly illuminating dark-grown tissues, replacing them in darkness, and determining the relationship between the percentage of the...

emphasisedl the difficulties which hadl to be met in producinig such a report. Ihc recommen(latioins of the Royal College of Obstetricians and(l Gyvncologists had been a help in this respect. anld tilc report tolloWe(l thc plal suggested by their committee. The speaker sumnmiiarised the mainl features ol the} report, and compared them wvith similar reports fromii teni other hospitals in Great 1...

On the basis of tests with over 20 species of erect plants, we reported in 1962 (9) that a strong growth curvature develops in the axis when an erect plant is rotated slowly on a horizontal clinostat. A differential transport of endogenous auxin was indicated by the production of a similar, predictable curvature after the application of triiodobenzoic acid (TIBA) to 1 side of the immature axial...

We present eecient (parallel) algorithms for two hierarchical clustering heuristics. We point out that these heuristics can also be applied to solve some algorithmic problems in graphs. This includes split decomposition. We show that eecient parallel split decomposition induces an eecient parallel parity graph recognition algorithm. This is a consequence of the result of 7] that parity graphs a...

We consider the problem of allocating the cost of an optimal traveling salesman tour in a fair way among the nodes visited; in particular, we focus on the case where the distance matrix of the underlying TSP problem satisses the triangle inequality. We thereby use the model of TSP games in the sense of cooperative game theory. We give examples showing that the core of such games may be empty, e...

The eecient usage of parallel computers and workstation clusters for biologically motivated simulations depends rst of all on a dynamic redistribution of the workload. For the development of a parallel algorithm for the Penna model of aging we have used a dynamic load balancing library , called PLB. It turns out that PLB manages a nearly balanced load situation during runtime taking only a low ...

CONGENITAL ABSENCE of a main pulmonary artery branch is now a well-recognized clinical entity, more than 60 cases having been reported in the literature. Diagnosis has heretofore been based primarily oln radiologic findings' in both routine x-rays and angiocardiography. Physiologic studies of pulmonary function, including differential bronchospirometry, however, provide valuable diagnostic info...

Let F be Boolean formulas in conjunctive normal form with n variables, r clauses, every clause has length s. We show that if F is split into two subformulas F v and F v by setting v true and false in F , then the expected number of solutions of one of the two subformulas F v and F v is signiicantly higher than that in the other subformula, when dealing with classes of formulas where the great m...

We study the lattice lat(M) of cocycles of a binary matroid M. By an isomorphism we show that such lattices are equivalent to lattices generated by the columns of proper submatrices of Sylvester matrices of full row length. As an application we show that the cocycle lattice of a recursively deened class of matroids, including all binary matroids of rank four, always has a basis consisting of co...