A.D. Scott

article

Relationship between cardiac diffusion tensor imaging parameters and anthropometrics in healthy volunteers

L.A. McGill, P.F. Ferreira, A.D. Scott, S. Nielles-Vallespin, more

Journal of Cardiovascular Magnetic Resonance > 2015 > 18 > 1 > 1-10

Background In vivo cardiac diffusion tensor imaging (cDTI) is uniquely capable of interrogating laminar myocardial dynamics non-invasively. A comprehensive dataset of quantative parameters and comparison with subject anthropometrics is required. Methods cDTI was performed at 3T with a diffusion weighted STEAM sequence. Data was acquired from the mid left ventricle in 43 subjects during the systolic...

article

Genotoxicity testing of a Hoodia gordonii extract

A.D. Scott, A. Orsi, C. Ward, R. Bradford

Food and Chemical Toxicology > 2012 > 50 > Supplement 1 > S34-S40

Hoodia gordonii extract consists of a mixture of steroid glycosides, fatty acids, plant sterols and alcohols. As part of the overall safety assessment H. gordonii extract was assessed for genotoxicity in two assays in vitro: a bacterial mutation assay; and a gene mutation assay using mouse lymphoma cells. H. gordonii extract showed no evidence of genotoxic activity in either of these assays. In addition,...

article

Syrian Hamster Embryo (SHE) cell transformation assay with and without X-ray irradiation of feeder cells using Di(2-ethylhexyl)phthalate (DEHP) and N-nitroso-N-methylnitroguanidine (MNNG)

K. Pant, J.E. Sly, S.W. Bruce, A.D. Scott, more

Mutation Research - Genetic Toxicology and Environmental Mutagenesis > 2010 > 698 > 1-2 > 6-10

The SHE cell transformation assay has traditionally been conducted with a feeder layer of X-ray irradiated cells to provide growth support to the target cells seeded in low numbers. The need for an X-ray irradiated feeder cell layer necessitates the maintenance of an X-ray machine and the additional step to seed feeder cells prior to plating target cells. This laboratory has previously reported a...

article

Reconstructing under Group Actions

A.J. Radcliffe, A.D. Scott

Graphs and Combinatorics > 2006 > 22 > 3 > 399-419

We give a bound on the reconstructibility of an action G X in terms of the reconstructibility of a the action N X, where N is a normal subgroup of G, and the reconstructibility of the quotient G/N. We also show that if the action G X is locally finite, in the sense that every point is either in an orbit by itself or has finite stabilizer, then the reconstructibility of G X is at most the reconstructibility...

chapter

Transporting audio over wireless ad hoc networks: experiments & new insights

C.-K. Toh, Wei K. Tsai, Victor O.K. Li, A.D. Scott, more

14th IEEE Proceedings on Personal, Indoor and Mobile Radio Communications, 2003. PIMRC 2003. > 1 > 772 - 777 Vol.1

14th IEEE 2003 International Symposium on Personal, Indoor and Mobile Radio Communications. Proceedings

Current efforts on ad hoc wireless network research are focused more on routing and multicasting protocols. However, there is an increasing need to understand what sort of media could be transported over wireless ad hoc networks other than data. Existing research on multimedia wireless communications often addresses broadband wireless networks with a connection-oriented backbone. In this paper, we...

article

A Note on Cycle Lengths in Graphs

R.J. Gould, P.E. Haxell, A.D. Scott

Graphs and Combinatorics > 2002 > 18 > 3 > 491-498

Abstract.We prove that for every c>0 there exists a constant K = K(c) such that every graph G with n vertices and minimum degree at least cn contains a cycle of length t for every even t in the interval [4,ec(G) K] and every odd t in the interval [K,oc(G) K], where ec(G) and oc(G) denote the length of the longest even cycle in G and the longest odd cycle in G respectively. We also give a rough...

article

The use of proton-transfer reactions to detect low levels of impurities in bulk oxygen using an atmospheric pressure ionization mass spectrometer

S.N. Ketkar, A.D. Scott, E.J. Hunter

International Journal of Mass Spectrometry > 2001 > 206 > 1-2 > 7-12

Atmospheric pressure ionization mass spectrometry (APIMS) is being routinely used to quantify trace impurities in bulk gases used in the manufacture of semiconductor devices. APIMS has been successfully applied for the quantification of ppt levels of O ₂ , H ₂ O, CO ₂ , and CH ₄ in Ar, N ₂ , and He. However, it has not been successfully used to quantify trace...

article

Alternating Knot Diagrams, Euler Circuits and the Interlace Polynomial

P.N. Balister, B. Bollobás, O.M. Riordan, A.D. Scott

European Journal of Combinatorics > 2001 > 22 > 1 > 1-4

We show that two classical theorems in graph theory and a simple result concerning the interlace polynomial imply that if K is a reduced alternating link diagram with n≥ 2 crossings, then the determinant of K is at least n. This gives a particularly simple proof of the fact that reduced alternating links are nontrivial.

article

On Induced Subgraphs with All Degrees Odd

A.D. Scott

Graphs and Combinatorics > 2001 > 17 > 3 > 539-553

Abstract.Gallai proved that the vertex set of any graph can be partitioned into two sets, each inducing a subgraph with all degrees even. We prove that every connected graph of even order has a vertex partition into sets inducing subgraphs with all degrees odd, and give bounds for the number of sets of this type required for vertex partitions and vertex covers. We also give results on the partitioning...

article

Subdivisions of Transitive Tournaments

A.D. Scott

European Journal of Combinatorics > 2000 > 21 > 8 > 1067-1071

We prove that, for r≥ 2 andn≥n(r), every directed graph with n vertices and more edges than the r -partite Turán graph T(r, n) contains a subdivision of the transitive tournament on r+ 1 vertices. Furthermore, the extremal graphs are the orientations ofT (r, n) induced by orderings of the vertex classes.

article

On graph decompositions modulo k

A.D. Scott

Discrete Mathematics > 1997 > 175 > 1-3 > 289-291

We prove that, for every integer k [ges ] 2, every graph has an edge-partition into 5k ² log k sets, each of which is the edge-set of a graph with all degrees congruent to 1 mod k. This answers a question of Pyber.

article

Reconstructing sequences

A.D. Scott

Discrete Mathematics > 1997 > 175 > 1-3 > 231-238

We prove that every sequence of length n can be reconstructed from the multiset of all its subsequences of length k, providedk [ge ] (1 + o(1)) n log n.This is a substantial improvement on previous bounds.

article

All trees contain a large induced subgraph having all degrees 1 (mod k)

David M. Berman, A.J. Radcliffe, A.D. Scott, Hong Wang, more

Discrete Mathematics > 1997 > 175 > 1-3 > 35-40

We prove that, for integers n [ges ] 2 and k [ges ] 2, every tree with n vertices contains an induced subgraph of order at least 2[lfloor](n + 2k [minus ] 3)/(2k [minus ]1)[rfloor] with all degrees congruent to 1 modulo k. This extends a result of Radcliffe and Scott, and answers a question of Caro et al.

article

Independent sets and repeated degrees

B. Bollobás, A.D. Scott

Discrete Mathematics > 1997 > 170 > 1-3 > 41-49

We answer a question of Erdos, Faudree, Reid, Schelp and Staton by showing that for every integer k 2 there is a triangle-free graph G of order n such that no degree in G is repeated more than k times and ind(G) = (1 + o(1))n/k.

article

Better bounds for perpetual gossiping

A.D. Scott

Discrete Applied Mathematics > 1997 > 75 > 2 > 189-197

In the perpetual gossiping problem, introduced by Liestman and Richards, information may be generated at any time and at any vertex of a graph G; adjacent vertices can communicate by telephone calls. We define W _k (G) to be the minimum w such that, placing at most k calls each time unit, we can ensure that every piece of information is known to every vertex with w time units of its generation...

article

Judicious Partitions of Hypergraphs

B. Bollobás, A.D. Scott

Journal of Combinatorial Theory, Series A > 1997 > 78 > 1 > 15-31

We prove the asymptotically best possible result that, for every integerk⩾2, every 3-uniform graph withmedges has a vertex-partition intoksets such that each set contains at most (1+o(1))m/k ³ edges. We also consider related problems and conjecture a more general result.

article

A Proof of a Conjecture of Bondy Concerning Paths in Weighted Digraphs

B. Bollobás, A.D. Scott

Journal of Combinatorial Theory, Series B > 1996 > 66 > 2 > 283-292

Our aim in this note is to prove a conjecture of Bondy, extending a classical theorem of Dirac to edge-weighted digraphs: if every vertex has out-weight at least 1 then the digraph contains a path of weight at least 1. We also give several related conjectures and results concerning heavy cycles in edge-weighted digraphs.

article

Every tree contains a large induced subgraph with all degrees odd

A.J. Radcliffe, A.D. Scott

Discrete Mathematics > 1995 > 140 > 1-3 > 275-279

Caro et al. [3] proved that every tree of order n contains an induced subgraph of order at least n with all degrees odd, and conjectured a better bound. In this note we prove that every tree of order n contains an induced subgraph of order at least 2 (n + 1) with all degrees odd; this bound is best possible for every value of n.

article

An XAFS study of the oxidation of structural iron in biotite mica by solutions containing Br ₂ or H ₂ O ₂

S.M. Heald, J.E. Amonette, G.D. Turner, A.D. Scott

Physica B: Physics of Condensed Matter > 1995 > 208-209 > 1-4 > 604-606

XAFS measurements have been made on the Fe edge for a series of biotite micas oxidized to different extents by solutions containing either Br ₂ or H ₂ O ₂ . The Fe in the Br ₂ -treated sample is nearly completely oxidized to Fe(III), while the H ₂ O ₂ -treated samples showed an intermediate degree of oxidization. Both the near-edge and EXAFS for the...

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Search results for: A.D. Scott

Relationship between cardiac diffusion tensor imaging parameters and anthropometrics in healthy volunteers

Genotoxicity testing of a Hoodia gordonii extract

Syrian Hamster Embryo (SHE) cell transformation assay with and without X-ray irradiation of feeder cells using Di(2-ethylhexyl)phthalate (DEHP) and N-nitroso-N-methylnitroguanidine (MNNG)

Reconstructing under Group Actions

Transporting audio over wireless ad hoc networks: experiments & new insights

A Note on Cycle Lengths in Graphs

The use of proton-transfer reactions to detect low levels of impurities in bulk oxygen using an atmospheric pressure ionization mass spectrometer

Alternating Knot Diagrams, Euler Circuits and the Interlace Polynomial

On Induced Subgraphs with All Degrees Odd

Subdivisions of Transitive Tournaments

On graph decompositions modulo k

Reconstructing sequences

All trees contain a large induced subgraph having all degrees 1 (mod k)

Independent sets and repeated degrees

Better bounds for perpetual gossiping

Judicious Partitions of Hypergraphs

A Proof of a Conjecture of Bondy Concerning Paths in Weighted Digraphs

Every tree contains a large induced subgraph with all degrees odd

An XAFS study of the oxidation of structural iron in biotite mica by solutions containing Br ₂ or H ₂ O ₂

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