We have examined the nature of the requirement for RNA synthesis during the differentiation of Naegleria gruberi amebae into flagellates (Fulton, C., and C. Walsh, 1980, J. Cell Biol., 85:346-360) by looking for poly(A)+RNAs that are specific to differentiating cells. A cDNA library prepared from poly(A)+RNA extracted from cells 40 min after initiation of the differentiation (40-min RNA), the t...

We prove a simple formula for MacPherson’s Chern class of hypersurfaces in nonsingular varieties. The result highlights the relation between MacPherson’s class and other definitions of homology Chern classes of singular varieties, such as Mather’s Chern class and the class introduced by W. Fulton in [Fulton], 4.2.6. §0. Introduction 2 §1. Statements of the result 4 §1.1. MacPherson’s Chern clas...

for the advantage of the reader how personality and timeliness of ideas have been major forces in the growth of our understanding of the "Wisdom of the Body." Especially to be recommended to students interested in tracing the background of modern concepts in neurophysiology are the essays by Professor Horace W. Magoun on "The development of ideas relating the mind with the brain," and Professor...

body fluids (Evans, 1993) is reflected in their eggs (Davenport et al., 1981; Riis-Vestergaard, 1982; Watanabe and Kuo, 1986; Mangor-Jensen, 1987; LaFleur and Thomas, 1991). However, these eggs have none of the advantages of the adult osmoregulatory organs associated with homeostasis, and the typical drinking activity seems to start at, or shortly before, hatching (Guggino, 1980; Mangor-Jensen ...

BACKGROUND The Metropolitan Atlanta Congenital Defects Program (MACDP) collects maternal address information at the time of delivery for infants and fetuses with birth defects. These addresses have been geocoded by two independent agencies: (1) the Georgia Division of Public Health Office of Health Information and Policy (OHIP) and (2) a commercial vendor. Geographic information system (GIS) me...

We prove that if X is a Grassmannian of type A, then the Schubert basis (small) quantum cohomology ring QH(X) only homogeneous deformation ordinary multiplies with non-negative structure constants. This implies (three point, genus zero) Gromov-Witten invariants are uniquely determined by Witten's presentation and fact they non-negative. conjecture same true for any flag variety = G/P simply lac...

We define the wonderful compactification of an arrangement of subvarieties. Given a complex nonsingular algebraic variety Y and certain collection G of subvarieties of Y , the wonderful compactification YG can be constructed by a sequence of blow-ups of Y along the subvarieties of the arrangement. This generalizes the Fulton-MacPherson configuration spaces and the wonderful models given by De C...

Adaptive multigrid techniques offer the potential of fast computation and high accuracy; they differ from conventional nested grid methods by making full use of the interplay between discretizations on the different grids. Their potential has been demonstrated in a multigrid barotropic hurricane track model (MUDBAR) developed by the PI, which runs ten to twenty times faster than a uniformresolu...

In this note based on the author’s communication with M. Batanin, we study a cofibrant E∞-operad generated by the Fox-Neuwirth cells of the configuration space of points in the Euclidean space. We show that, below the ‘critical dimensions’ in which ‘bad cells’ exist, this operad is modeled by the geometry of the Fulton-MacPherson compactification of this configuration space. We analyze the Tama...