Results 271 to 280 of about 4,657,009 (295)

On the number of (r,r+1)‐ factors in an (r,r+1)‐factorization of a simple graph

Journal of Graph Theory, 2009
AbstractFor integers d≥0, s≥0, a (d, d+s)‐graph is a graph in which the degrees of all the vertices lie in the set {d, d+1, …, d+s}. For an integer r≥0, an (r, r+1)‐factor of a graph G is a spanning (r, r+1)‐subgraph of G. An (r, r+1)‐factorization of a graph G is the expression of G as the edge‐disjoint union of (r, r+1)‐factors.
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R factor compatibility groups

Molecular and General Genetics MGG, 1972
Eight R factors are described which fall into four compatibility groups, distinct from previously described F-like and I-like groups. E. coli K12 carrying one of these factors, TP114, supports multiplication of the I-specific phage If1. However, TP114 is fully compatible with the I-like factor T-Δ and with all the other R factors described in this ...
N D, Grindley, J N, Grindley, E S, Anderson   +2 more
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Factor Structure of the WISC-R

Multivariate Behavioral Research, 1989
A simultaneous maximum likelihood confirmatory factor analysis was performed on the 12 subtests the WISC-R in the 11 age groups of normative sample. Several models were fit to the data and compared, including: a single-factor model; orthogonal and oblique two-factor models, comprised of the Virbal and Performance subtests, respectively; and orthogonal ...
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Observations on the Factor Structure of the WAIS-R

Assessment, 2000
Confirmatory factor analyses (CFAs) revealed 2 important characteristics of the standardization data of the Wechsler Adult Intelligence Scale-Revised. One finding was that Digit Symbol fit better on an attentional factor in younger groups, but fit was better when Digit Symbol loaded on a visual-perceptual factor in older groups.
Ward, LC, Axelrod, BN, Ryan, JJ
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R Factors for Aminoglycoside Antibiotics

Journal of Infectious Diseases, 1969
The definition of R factors by Japanese scientists 10 years ago opened a new chapter in the saga of antibiotic resistance among enteric bacteria [1]. This package of extrachromosomal genes, comprised of the resistance determinants, which mediate resistance to a variety of environmental hazards, and the resistance transfer factors (RTF), which mediate ...
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Cancer and the unavoidable R factor

Science, 2017
Cancer Etiology Most textbooks attribute cancer-causing mutations to two major sources: inherited and environmental factors. A recent study highlighted the prominent role in cancer of replicative (R) mutations that arise from a third source: unavoidable errors associated with DNA replication. Tomasetti et al.
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Factor analysis of the WMS-R and the WAIS

Archives of Clinical Neuropsychology, 1992
A principal components factor analysis of the Wechsler Memory Scale-Revised (WMS-R) and Wechsler Adult Intelligence Scale (WAIS) was performed on 133 patients referred for neuropsychological assessment al a university medical center. Six factors were selected according to the Scree test, percentage of variance extracted, and the meaningfulness of the ...
S D, Nicks, F T, Leonberger, D C, Munz, P R, Goldfader   +3 more
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Independence number, connectivity, and r‐factors

Journal of Graph Theory, 1989
AbstractWe show that if r ⩾ 1 is an odd integer and G is a graph with |V(G)| even such that k(G) ⩾ (r + 1)2/2 and (r + 1)2α(G) ⩽ 4rk(G), then G has an r‐factor; if r ⩾ 2 is even and G is a graph with k(G) ⩾ r(r + 2)/2 and (r + 2)α(G) ⩽ 4k(G), then G has an r‐factor (where k(G) and α(G) denote the connectivity and the independence number of G ...
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R Factors

Journal of Infectious Diseases, 1969
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R Factors

Science, 1976
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