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Search Results: 1 - 10 of 206351 matches for " Kevin P. Bancroft "
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Dynamic Stability of Coral Reefs on the West Australian Coast
Conrad W. Speed, Russ C. Babcock, Kevin P. Bancroft, Lynnath E. Beckley, Lynda M. Bellchambers, Martial Depczynski, Stuart N. Field, Kim J. Friedman, James P. Gilmour, Jean-Paul A. Hobbs, Halina T. Kobryn, James A. Y. Moore, Christopher D. Nutt, George Shedrawi, Damian P. Thomson, Shaun K. Wilson
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0069863
Abstract: Monitoring changes in coral cover and composition through space and time can provide insights to reef health and assist the focus of management and conservation efforts. We used a meta-analytical approach to assess coral cover data across latitudes 10–35°S along the west Australian coast, including 25 years of data from the Ningaloo region. Current estimates of coral cover ranged between 3 and 44% in coral habitats. Coral communities in the northern regions were dominated by corals from the families Acroporidae and Poritidae, which became less common at higher latitudes. At Ningaloo Reef coral cover has remained relatively stable through time (~28%), although north-eastern and southern areas have experienced significant declines in overall cover. These declines are likely related to periodic disturbances such as cyclones and thermal anomalies, which were particularly noticeable around 1998/1999 and 2010/2011. Linear mixed effects models (LME) suggest latitude explains 10% of the deviance in coral cover through time at Ningaloo. Acroporidae has decreased in abundance relative to other common families at Ningaloo in the south, which might be related to persistence of more thermally and mechanically tolerant families. We identify regions where quantitative time-series data on coral cover and composition are lacking, particularly in north-western Australia. Standardising routine monitoring methods used by management and research agencies at these, and other locations, would allow a more robust assessment of coral condition and a better basis for conservation of coral reefs.
Insights into the Structural and Functional Evolution of Plant Genomes Afforded by the Nucleotide Sequences of Chromosomes 2 and 4 of Arabidopsis thaliana
Ian Bancroft
Comparative and Functional Genomics , 2000, DOI: 10.1002/(sici)1097-0061(200004)17:1<1::aid-yea3>3.0.co;2-v
Abstract: The rapidly accumulating genome sequence data from the plant Arabidopsis thaliana allows more detailed analysis of genome content and organisation than ever bafore possible in plants. The genome shows a surprisingly high level of genetic redundancy, with as many as 75% of gene products showing signficant homology to another protien of A. thaliana. Many duplicated genes occur in arrays of conserved order and indicate that A. thaliana is likely to have had a tetraploid ancestor. Analysis of the divergence of duplicated genome segments leads to the prediction of two major modes of plant genome evolution: macro-scale duplication and rearrangement of chromosomes and micro-scale translocation, duplication and loss of individual genes or small groups of genes.
Insights into cereal genomes from two draft genome sequences of rice
Ian Bancroft
Genome Biology , 2002, DOI: 10.1186/gb-2002-3-6-reviews1015
Abstract: A third of the human population depends on rice as a staple food [1]. Rice is also an important model for other cereal crops that, along with rice, account for more than 60% of worldwide agricultural production [2]. Its small genome and long history of genetic studies led to rice being an early target for complete genome sequencing. Draft sequence has recently been reported for two subspecies of rice: japonica [3], which is widely grown in Japan, and indica [4], which is widely grown in China and elsewhere. These sequence data can now be analyzed and compared with the published genome sequence of the widely adopted model species for dicotyledonous flowering plants, Arabidopsis thaliana [5].The rice draft genomic sequences were generated by whole-genome shotgun (WGS) sequencing, largely starting from plasmid clones of nuclear DNA. This strategy contrasts with that employed by the International Rice Gene Sequencing Project (IRGSP) [6], which produces high-quality sequence from large-insert clones that are individually selected from a complete physical map.WGS sequencing rapidly and cost-effectively generates sequence from nearly all of the genes in the genome, but the lengths of contiguous sequence are shorter, errors are more numerous and integration with genetic maps is poorer. The japonica WGS sequencing [3] was conducted to 6X redundancy - that is, each base was sequenced an average of six times. Repeated sequences (which are numerous in the rice genome) were removed, permitting the assembly of 42,109 contiguous sequences, or contigs, representing 390 megabases of total sequence (thus, the mean length of contigs was 9.2 kb). The indica WGS sequencing [4] was conducted to 4X redundancy. In this case, repeated sequences were masked, permitting the assembly of 127,550 sequence contigs, representing 361 Mb total length (the mean length of contigs was thus 3.5 kb). The total size of the indica genome was estimated as 466 Mb [4] and that of japonica should be very simil
The Shard Intersection Order on Permutations
Erin Bancroft
Mathematics , 2011,
Abstract: The shard intersection order is a new lattice structure on a finite Coxeter group W which encodes the geometry of the reflection arrangement and the lattice theory of the weak order. In the case where W is the symmetric group, we characterize shard intersections as certain pre-orders which we call permutation pre-orders. We use this combinatorial characterization to determine properties of the shard intersection order. In particular, we give an EL-labeling.
Reduction of pro-inflammatory cytokines in rats following 7-day oral supplementation with a proprietary eggshell membrane-derived product  [PDF]
Kevin J. Ruff, Dale P. DeVore
Modern Research in Inflammation (MRI) , 2014, DOI: 10.4236/mri.2014.31003
Abstract: NEM® brand eggshell membrane is a novel dietary supplement that has been clinically shown to alleviate arthritis joint pain and stiffness; however the mechanism of action is not well understood. Preliminary evidence from an in vitro study of NEM® indicated that the mechanism of action may be based on the reduction of pro-inflammatory cytokines. In vivo studies were therefore initiated to evaluate the effects of NEM® on pro-inflammatory and anti-inflammatory cytokines following oral administration in rats. NEM® was administered daily at doses of 6.13 mg/kg bw/day (Study 1), 10.0 mg/kg bw/day (Study 2), or at doses of 0 (control), 26.0 or 52.0 mg/kg bw/day (Study 3) by oral gavage for 7 consecutive days. Inflammation was induced in the Study 3 rats by intraperitoneal injection of lipopolysaccharide. Changes in plasma cytokine levels from baseline following 7 days of oral supplementation with NEM® at 6.13 mg/kg bw/ day (Study 1) were statistically significant at Day 8 for IL-2, TIMP-1 and VEGF, at Day 21 for IL-10, and at Day 35 for MCP-1, MCP-3 and TIMP-1, and at 10.0 mg/kg
3-manifolds which are spacelike slices of flat spacetimes
Kevin P. Scannell
Physics , 2000, DOI: 10.1088/0264-9381/18/9/306
Abstract: We continue work initiated in a 1990 preprint of Mess giving a geometric parameterization of the moduli space of classical solutions to Einstein's equations in 2+1 dimensions with cosmological constant 0 or -1 (the case +1 has been worked out in the interim by the present author). In this paper we make a first step toward the 3+1-dimensional case by determining exactly which closed 3-manifolds M^3 arise as spacelike slices of flat spacetimes, and by finding all possible holonomy homomorphisms pi_1(M^3) to ISO(3,1).
Transient dynamics of pulse-coupled oscillators with nonlinear charging curves
Kevin P. O'Keeffe
Physics , 2015,
Abstract: We consider the transient behavior of globally coupled systems of identical pulse coupled oscillators. Synchrony develops through an aggregation phenomenon, with clusters of synchronized oscillators forming and growing larger in time. Previous work derived expressions for these time dependent clusters, when each oscillator obeyed a linear charging curve. We generalize these results to cases where the charging curves have nonlinearities
Representations of braid groups via conjugation actions on congruence subgroups
Kevin P. Knudson
Mathematics , 2004,
Abstract: We construct two families of representations of the braid group $B_n$ by considering conjugation actions on congruence subgroups of $GL_{n-1}(Z[t^{\pm 1},q^{\pm 1}])$. We show that many of these representations are faithful modulo the center of $B_n$.
Relative completions and $K_2$ of curves
Kevin P. Knudson
Mathematics , 2005,
Abstract: We compute the completion of the special linear group over the coordinate ring of a curve over a number field $k$ relative to its representation in $\slnk$, and relate this to the study of $K_2$ of the curve.
A refinement of multi-dimensional persistence
Kevin P. Knudson
Mathematics , 2007,
Abstract: We study the multi-dimensional persistence of Carlsson and Zomorodian and obtain a finer classification based upon the higher tor-modules of a persistence module. We propose a variety structure on the set of isomorphism classes of these modules, and present several examples. We also provide a geometric interpretation for the higher tor-modules of homology modules of multi-filtered simplicial complexes.
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