This paper reports the investigation of risk factors for bovine herpesvirus-1-seropositivity, based on a cluster-sample survey of the Belgian cattle population. This serosurvey was carried out in 1998 in 309 randomly selected unvaccinated herds of all types (dairy, mixed and beef) were all bovids (N = 11,284) were sampled. Older and male cattle had higher seroprevalence. Origin (homebred or pur...

We prove that almost surely the first non-empty (k+1)-core to arise during the random graph process will have a k-factor or will be k-factor-critical. Thus the threshold for the appearance of a k-regular subgraph is at most the threshold for the (k+1)-core. This improves a result of Pralat, Verstraete and Wormald [5] and proves a conjecture of Bollobas, Kim and Verstraete [3].

perfect matchings. (A perfect matching or 1-factor is a set of disjoint edges covering all vertices.) This generalizes a result of Voorhoeve [11] for the case k = 3, stating that any 3-regular bipartite graph with 2n vertices has at least ( 4 3) n perfect matchings. The base in (1) is best possible for any k: let αk be the largest real number such that any k-regular bipartite graph with 2n vert...

A method is proposed to extend the hard scattering picture of Brodsky and Lepage to transitions between hadrons with orbital angular momentum ℓ = 0 and ℓ = 1. The use of covariant spin wave functions turns out to be very helpful in formulating that method. As a first application we construct a light-cone wave function of the nucleon resonance N * (1535) in the quark-diquark picture. Using this ...

Precise data on the neutron magnetic form factor Gmn have been obtained with measurements of the ratio of cross sections of D(e, en) and D(e, ep) up to momentum transfers of Q= 0.9 (GeV/c). Data with typical uncertainties of 1.5% are presented. These data allow for the first time to extract a precise value of the magnetic radius of the neutron.

Background & Aim: Different species from mint family (Lamiaceae) are used as spices and fragrance in food or as medicine against viral or microbial diseases in many countries for generation. Lamiaceae family contains 46 genus and 410 species. One of the valuable and medicinal species of this family is Ziziphora clinopodioides Lam. This species contains the essential o...

To achieve productive infection, the reverse transcribed cDNA of human immunodeficiency virus type 1 (HIV-1) is inserted in the host cell genome. The main protein responsible for this reaction is the viral integrase. However, studies indicate that the virus is assisted by cellular proteins, or co-factors, to achieve integration into the infected cell. The barrier-to-autointegration factor (BAF)...

Dr. Marian Rewers is Professor of Pediatrics and Medicine at the Barbara Davis Center for Childhood Diabetes, University of Colorado School of Medicine, Aurora, CO. Dr. Lars C. Stene is Senior Scientist at the Department of Child Health, Norwegian Institute of Public Health, Oslo, Norway. Dr. Jill M. Norris is Professor of Epidemiology at the Colorado School of Public Health, University of Colo...

1. Introduction. A graph G consists of a set 7 of elements called vertices together with a set E of elements called edges, the two sets having no element in common. With each edge there are associated either one or two vertices called its ends. In this paper we consider only graphs in which each edge has two distinct ends. We call such a graph oriented if one end of each edge is distinguished a...

Let be a graph. If there exists a spanning subgraph G F such that     1,3, , 2 1 F d x n    , then F is called to be -odd factor of . Some sufficient and necessary conditions are given for to have    n   1,2 1 G G U – 1,2 1 n  -odd factor where is any subset of such that U   V G U k  .