We consider problems of distributing a number of points within a polygonal region P, such that the points are \far away" from each other. Problems of this type have been considered before for the case where the possible locations form a discrete set. Dispersion problems are closely related to packing problems. While Hochbaum and Maass (1985) have given a polynomial time approximation scheme for...

Silent information regulator-2 (SIR2) proteins regulate lifespan of diverse organisms, but their distribution and roles in the CNS remain unclear. Here, we show that sirtuin 2 (SIRT2), a mammalian SIR2 homolog, is an oligodendroglial cytoplasmic protein and localized to the outer and juxtanodal loops in the myelin sheath. Among cytoplasmic proteins of OLN-93 oligodendrocytes, alpha-tubulin was ...

Summetlary. The effect of sodium chloride added to root medium of pea seedlings on respiratory activity of tissue segments and on isolated mitochondria was studied. Salinization enhances the respiration of leaves about one-third on a fresh weight, dry weight or protein basis. Roots and stems show only 10 to 15 % respiratory stimuilation. The onset of respiratory increase in leaves rouighly para...

The successful rootingof leafy cuttings inivolves three physiologieally distinct processes: initiation of root primordia; development of true roots from these initials; and mainitenance of the cutting as ani excised organ during the rooting. The first of these, where it does niot take place sponitanieously, cani be brought about in many plants by treatment with auxini. The second (outgrow^th of...

T HE accumulation of accurate iniformiation as regards operative mortality and results of surgery is basic to the advancement of the surgical management of any disease. It has been amply demonstrated by Lewis and Tauflc,1 Swan,2 Gross and associates,3 Bailey and associates,4 Bj6rk and Crafoord,5 Gibbon,6 Shumacker7 and ourselves8 that a number of technics of closure of atrial septal defects can...

The structural and energetic properties of [loo] and [llO] steps on the (001) surface of fee metal have been determined by T = 0 atomistic simulations. The interactions between [NO] steps and between [llO] steps on the (001) surface are determined from the surface energy of a series of (Oln) and (ilm) surfaces, respectively. For step spacings larger than three fee lattice parameters (R > 3a,), ...

A clear picture of the influential drivers of private family firm performance has proven to be an elusive target. The unique characteristics of private family owned firms necessitate a broader, non-financial approach to reveal firm performance drivers. This research study sought to specify and evaluate the themes that distinguish successful family firms from less successful family firms. In add...

We describe three tra c microsimulations which operate at di erent levels of delity. They are used to iteratively generate a self-consistent route-set based upon microsimulation feedback. We compare the simulation results of all three simulations to aggregated turn count data of actual eld measurements. Acknowledgments { We thank A. Bachem and R. Schrader for supporting MR's work as part of the...

T HE VITAL but neglected subject of the place of heredity in the background of coronary heart disease needs to be brought into the limelight to share at least oln even terms in research with the sum of the possible environmental factors now being studied. Incidentally this is true of many other of the diseases of mankind in which the individual or host seems to have been lost in the preoccupati...