5,757 research outputs found
The search for exudates from Eurasian watermilfoil and hydrilla
Secondary metabolites are produced by aquatic plants, and in some instances, exudation of these metabolites into the surrounding water has been detected. To determine whether infestations of Eurasian watermilfoil or hydrilla produce such exudates, plant tissues and water samples were collected from laboratory cultures and pond populations and were analyzed using solid phase extraction, HPLC, and various methods of mass spectrometry including electrospray ionization, GC/MS, electron impact and chemical ionization. Previously reported compounds such as tellimagrandin II (from Eurasian watermilfoil) and a caffeic acid ester (from hvdrilla), along with a newly discovered flavonoid, cyanidin 3 dimalonyl glucoside (from hydrilla), were readily detected in plant tissues used in this research but were not detected in any of the water samples. If compounds are being released, as suggested by researchers using axenic cultures, we hypothesize that they may be rapidly degraded by bacteria and therefore undetectable
Current moments of 1D ASEP by duality
We consider the exponential moments of integrated currents of 1D asymmetric
simple exclusion process using the duality found by Sch\"utz. For the ASEP on
the infinite lattice we show that the th moment is reduced to the problem of
the ASEP with less than or equal to particles.Comment: 13 pages, no figur
Duality and Non-linear Response for Quantum Hall Systems
We derive the implications of particle-vortex duality for the electromagnetic
response of Quantum Hall systems beyond the linear-response regime. This
provides a first theoretical explanation of the remarkable duality which has
been observed in the nonlinear regime for the electromagnetic response of
Quantum Hall systems.Comment: 7 pages, 1 figure, typeset in LaTe
Seagrass and marine resources in the Dugong protection areas of Upstart Bay, Newry Region, Sand Bay, Llewellyn Bay, Ince Bay and the Clairview Region, April/May 1999 and October 1999
The Marine Plant Ecology Group (Queensland Fisheries Service, Queensland
Department of Primary Industries) was commissioned by the Great Barrier Reef
Marine Park Authority to undertake two (one autumn and one spring) detailed
seagrass surveys of the Dugong Protection Areas in Upstart Bay, Newry region, Sand
Bay, Llewellyn Bay, Ince Bay, and a reconnaissance survey in the Clairview region. The
information gathered from these surveys enhances the understanding and subsequent
management of seagrass resources for fisheries and as dugong feeding habitats
Preliminary evaluation of an acoustic technique for mapping tropical seagrass habitats
Seagrass meadows in Queensland are important nursery habitat for commercial species of penaeid prawns and fish. Seagrasses are essential food for dugong, Dugong dugon, and green sea turtles, Chelonia mydas (Linnaeus) and act as nutrient and sediment sinks. Seagrasses in coastal regions play important roles in maintaining sediment stability and water clarity. Coastal seagrass meadows are therefore an important resource
economically and ecologically. Information on the species composition, abundance and
distribution of seagrasses is used by management to zone for protection of seagrass habitats
Anomalies on orbifolds with gauge symmetry breaking
We embed two 4D chiral multiplets of opposite representations in the 5D N=2
gauge theory compactified on an orbifold .
There are two types of orbifold boundary conditions in the extra dimension to
obtain the 4D N=1 gauge theory from the bulk: in
Type I, one has the bulk gauge group at and the unbroken gauge group at
while in Type II, one has the unbroken gauge group at both fixed
points. In both types of orbifold boundary conditions, we consider the zero
mode(s) as coming from a bulk -plet and brane fields at the fixed
point(s) with the unbroken gauge group. We check the consistency of this
embedding of fields by the localized anomalies and the localized FI terms. We
show that the localized anomalies in Type I are cancelled exactly by the
introduction of a bulk Chern-Simons term. On the other hand, in some class of
Type II, the Chern-Simons term is not enough to cancel all localized anomalies
even if they are globally vanishing. We also find that for the consistent
embedding of brane fields, there appear only the localized log FI terms at the
fixed point(s) with a U(1) factor.Comment: LaTeX file of 19 pages with no figure, published versio
Recommended from our members
The analysis of therapeutic improvisatory music with people living with the virus HIV and AIDS
This project is concerned with the musical and therapeutic processes involved in therapeutic improvisation.(1) Previous studies in music therapy have, in the main, focused their attention on avenues of outcome, attempting to validate through strict psychological designs and statistical data_ This thesis argues that the musical and therapeutic processes are integral yet independent aspects of the overall concept of therapeutic improvisation and the efficacy contained therein. In terms of valid enquiry it is proposed that the unity and division of both musical and therapeutic avenues will afford music therapists a greater clue to the understanding of the music therapy process itself. In terms of analytical and methodological framework, this project attempts to discover a formula for viewing the therapeutic improvisation at both macro and micro levels. Three clients, living with the virus HIV and AIDS were chosen and worked with collaboratively throughout the whole of the data collection_ The investigations were initiated through a four-stage analytical format ; from the complete therapeutic framework through to the indepth evaluations of two small sections of one complete improvisation. The four stages were subsequently evaluated in drawing possible connections between the macro and micro levels. Further to this data, the client and three outside validators added information with regard to the single improvisation, in validating the questions raised. The analysis and subsequent results highlight the merits and problems of such an analytical procedure. The conclusion and results of this thesis would seem to suggest that further process-orientated research in musictherapy needs to be undertaken to complement and contrast the issues of outcome research. 1. For the purposes of this project the term Therapeutic Improvisation has been chosen to identify the improvisational aspects of music therapy
Self-Trapping, Quantum Tunneling and Decay Rates for a Bose Gas with Attractive Nonlocal Interaction
We study the Bose-Einstein condensation for a cloud of Li atoms with
attractive nonlocal (finite-range) interaction in a harmonic trap. In addition
to the low-density metastable branch, that is present also in the case of local
interaction, a new stable branch appears at higher densities. For a large
number of atoms, the size of the cloud in the stable high-density branch is
independent of the trap size and the atoms are in a macroscopic quantum
self-trapped configuration. We analyze the macroscopic quantum tunneling
between the low-density metastable branch and the high-density one by using the
istanton technique. Moreover we consider the decay rate of the Bose condensate
due to inelastic two- and three-body collisions.Comment: 5 pages, 4 figures, submitted to Phys. Rev.
- …