Phylogenetic distance does not predict competition in green algal communities

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/116355/1/ecs214005021.pd

Benefits transfer: conceptual problems in estimating water quality benefits using existing studies

The Environmental Protection Agency has used existing studies to estimate the benefits of environmental improvements associated with several regulatory proposals The problems encountered in using existing studies to measure the benefits of water quality improvements are investigated in this paper. We propose criteria for selecting transfer studies and present a case study of a transfer. Our research indicates that although benefit transfer may offer promise, the fact that existing studies were not designed for transfer places severe limitations on the current effectiveness of transfer. Suggestions for future research are presented to address these limitations

Benefits transfer: conceptual problems in estimating water quality benefits using existing studies

The Environmental Protection Agency has used existing studies to estimate the benefits of environmental improvements associated with several regulatory proposals The problems encountered in using existing studies to measure the benefits of water quality improvements are investigated in this paper. We propose criteria for selecting transfer studies and present a case study of a transfer. Our research indicates that although benefit transfer may offer promise, the fact that existing studies were not designed for transfer places severe limitations on the current effectiveness of transfer. Suggestions for future research are presented to address these limitations

Magnetic Determination of Hc2H_{c2} under Accurate Alignment in (TMTSF)2_2ClO4_4

Cantilever magnetometry has been used to measure the upper critical magnetic field $H_{c2}$ of the quasi-one dimensional molecular organic superconductor (TMTSF)$_2$ClO$_4$. From simultaneous resistivity and torque magnetization experiments conducted under precise field alignment, $H_{c2}$ at low temperature is shown to reach 5T, nearly twice the Pauli paramagnetic limit imposed on spin singlet superconductors. These results constitute the first thermodynamic evidence for a large $H_{c2}$ in this system and provide support for spin triplet pairing in this unconventional superconductorComment: Submitted July 1, 2003, Accepted December 9, 2003, Physical Review Letter

Presence of Salmonella spp. In retail pork in Norther Ireland

As part of an mvestigation into the potential hazard presented to the population of Northern Ireland by Salmonella spp. in raw pork products a survey was designed and conducted . Two geographical locations were chosen for the purchase of samples; Belfast and Coleraine. At both locations on each sampling day ten sample consisting of retail packs of fresh, chilled pork products were purchased. At both sites three supermarkets were sampled plus two butchers shops. Two different products were purchased at each premises. Where possible one sample of organically produced meat was obta1ned. Samples were taken immediately to the laboratory and analyses commenced within two hours of purchasing the samples. Analysis was according to ISO 6579:2002: Microbiology of food and an1mal feeding stuffs-Horizontal method for the detection of Salmonella spp. Following enrichment samples were plated onto brilliant green agar and xylose lysine desoxycholate agar

Destruction of density-wave states by a pseudo-gap in high magnetic fields: application to (TMTSF)2_2ClO4_4

A model is presented for the destruction of density-wave states in quasi-one-dimensional crystals by high magnetic fields. The model is consistent with previously unexplained properties of the organic conductors (TMTSF)$_2$ClO$_4$ and (BEDT-TTF)$_2$MHg(SCN)$_4$ (M=K,Rb,Tl). As the magnetic field increases quasi-one-dimensional density-wave fluctuations increase, producing a pseudo-gap in the electronic density of states near the transition temperature. When the pseudo-gap becomes larger than the mean-field transition temperature formation of a density-wave state is not possible.Comment: 4 pages, RevTeX, 2 figures in uuencoded compressed tar file. Small changes to text and Figure 1. Final version to appear in Physical Review Letter

Role of the dimerized gap due to anion ordering in spin-density wave phase of (TMTSF)2_2ClO4_4 at high magnetic fields

Magnetoresistance measurements have been carried out along the highly conducting a axis in the FISDW phase of hydrogened and deuterated (TMTSF)$_2$ClO$_4$ for various cooling rates through the anion ordering temperature. With increasing the cooling rate, a) the high field phase boundary $\beta_{\rm {HI}}$, observed at 27 T in hydrogened samples for slowly cooled, is shifted towards a lower field, b) the last semimetallic SDW phase below $\beta_{\rm {HI}}$ is suppressed, and c) the FISDW insulating phase above $\beta_{\rm {HI}}$ is enhanced in both salts. The cooling rate dependence of the FISDW transition and of $\beta_{\rm {HI}}$ in both salts can be explained by taking into account the peculiar SDW nesting vector stabilized by the dimerized gap due to anion ordering.Comment: 6pages,6figures(EPS), accepted for publication in PR

Superconductivity of Quasi-One and Quasi-Two Dimensional Tight-Binding Electrons in Magnetic Field

The upper critical field $H_{c2}(T)$ of the tight-binding electrons in the three-dimensional lattice is investigated. The electrons make Cooper pairs between the eigenstates with the same energy in the strong magnetic field. The transition lines in the quasi-one dimensional case are shown to deviate from the previously obtained results where the hopping matrix elements along the magnetic field are neglected. In the absence of the Pauli pair breaking the transition temperature $T_c(H)$ of the quasi-two dimensional electrons is obtained to oscillationally increase as the magnetic field becomes large and reaches to $T_c(0)$ in the strong field as in the quasi-one dimensional case.Comment: 4pages,4figures,to be published in J.Phys.Soc.Jp