A gene for ribosomal protein P0 that belongs to the family of ribosomal P proteins was isolated from a Neurospora crassa cDNA library, using polyclonal antibodies against recombinant P0 protein from Saccharomyces cerevisiae. This is the first gene for ribosomal P0 protein to be cloned from filamentous fungi. The derived P0 protein sequence has a strong homology to other eukaryotic P0 proteins; ...

The spectra of both protons and alpha particles (1 ~ E ~ 7 MeV/nucleon) during 31 recurrent particle streams are fit well by an exponential in particle rigidity. Although the spectra show considerable temporal variation, the proton and alpha particle spectra are correlated such that the e-folding rigidities P0 (a) and P0 (p) of the two spectra are in the ratio P0 (a)/ P0 (p) = 1.5 ± 0.1. The co...

Let M ⊂ C and M ′ ⊂ C ′ be two smooth (C) generic submanifolds with p0 ∈ M and p ′ 0 ∈ M . We shall consider holomorphic mappings H : (C , p0) → (C ′ , p0), defined in a neighborhood of p0 ∈ C N , such that H(M) ⊂ M ′ (and, more generally, smooth CR mappings (M, p0) → (M , p0); see below). We shall always work under the assumption that M is of finite type at p0 in the sense of Kohn and Bloom–Gr...

The central nervous system (CNS) of terrestrial vertebrates underwent a prominent molecular change when proteolipid protein (PLP) replaced P0 protein as the most abundant protein of CNS myelin. However, PLP did not replace P0 in peripheral nervous system (PNS) myelin. To investigate the possible consequences of a PLP to P0 shift in PNS myelin, we engineered mice to express PLP instead of P0 in ...

Let P (x) = pdx + . . . + p0 ∈ Z[x] be such that d ≥ 1, pd = 1, p0 ≥ 2 and N = {0, 1, . . . , p0 − 1}. We are proving in this note a new criterion for the pair {P (x),N} to be a canonical number system. This enables us to prove that if p2, . . . , pd−1, ∑d i=1 pi ≥ 0 and p0 > 2 ∑d i=1 |pi|, then {P (x),N} is a canonical number system.

We show that in the rat, the major gene of PNS myelin, P0, is expressed long before myelination in the neural crest, Schwann cell precursors, and embryonic Schwann cells irrespective of whether they will myelinate or not. This myelin-independent P0 expression is constitutive and likely to serve as a specific marker for the Schwann cell lineage. The much higher P0 expression accompanying myelina...

Let q be a prime with primitive root 2. We show that (a) if (pi) q−2 i=0 is a sequence of primes such that pi = 2pi−1 + 1 for all 1 ≤ i ≤ q − 2, then q divides p0 + 1 or p0 ∈ {2, 3, 5} and (b) if (pi) q−2 i=0 is a sequence of primes such that pi = 2pi−1 − 1 for all 1 ≤ i ≤ q − 2, then q divides p0 − 1 or p0 ∈ {2, 3}.

Differential targeting of myelin proteins to multiple, biochemically and functionally distinct Schwann cell plasma membrane domains is essential for myelin formation. In this study, we investigated whether the myelin protein P0 contains targeting signals using Madin-Darby canine kidney (MDCK) cells. By confocal microscopy, P0 was localized to MDCK cell basolateral membranes. C-terminal deletion...

The myelin P0 protein is glycosylated at a single site, asparagine 93, within its only immunoglobulin (Ig)-like domain. We have previously shown that P0 behaves like a homophilic adhesion molecule (Filbin, M. T., F. S. Walsh, B. D. Trapp, J. A. Pizzey, and G. I. Tennekoon. 1990. Nature (Lond.). 344:871-872). To determine if the sugar residues of this molecule contribute to its adhesiveness, the...

We consider a smooth Tonelli Lagrangian L : TTn → R and its viscosity solutions u(x, P ) characterized by the cell equation H(x, P + Dxu(x, P )) = H(P ), where H : T ∗Tn → R is the Hamiltonian associated with L. We will show that if P0 corresponds to a quasi-periodic Lagrangian invariant torus, then Dxu(x, P ) is Hölder continuous in P at P0 with Hölder exponent arbitrarily close to 1, and if b...